CN101379279B - Method and apparatus for operating a methane-fuelled engine and treating exhaust gas with a methane oxidation catalyst - Google Patents
Method and apparatus for operating a methane-fuelled engine and treating exhaust gas with a methane oxidation catalyst Download PDFInfo
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- CN101379279B CN101379279B CN2007800044135A CN200780004413A CN101379279B CN 101379279 B CN101379279 B CN 101379279B CN 2007800044135 A CN2007800044135 A CN 2007800044135A CN 200780004413 A CN200780004413 A CN 200780004413A CN 101379279 B CN101379279 B CN 101379279B
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- Prior art keywords
- motor
- fuel
- methane
- oxidation catalyst
- engine
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- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
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- Y02T10/30—Use of alternative fuels, e.g. biofuels
Abstract
A method and apparatus is provided for operating a methane-fuelled engine in a lean burn operating mode or a stoichiometric operating mode. When a methane oxidation catalyst is employed to treat the exhaust gas from an engine running in a lean burn operating mode, the catalyst can be inhibited by SOx reducing the catalyst's methane conversion efficiency. When an engine is running in a stoichiometric operating mode, desulphation of the catalyst can occur, thereby restoring the catalyst's methane conversion efficiency. The disclosed method relates to fuelling the engine with a lean fuel mixture when operating the engine at one of a predetermined first set of points on an engine map, and fuelling the engine with a rich fuel mixture when operating the engine at one of a predetermined second set of points on said engine map. The exhaust gas from the engine flows through a methane oxidation catalyst, which is preferred embodiments is adapted to promote the reduction of NOx when the engine is running in the stoichiometric operating mode. The apparatus comprises means for detecting and controlling lambda, and an electronic controller programmed to operate the engine in one of a lean burn mode and a fuel-rich mode at respective predetermined points on an engine map.
Description
Technical field
The present invention relates to a kind of method and apparatus of making the motor of fuel for operation with methane and processing exhausting air with methane oxidation catalyst.The present invention can be applicable to vehicle motor or other motors with variable load circular flow, to reduce the discharging of carbon monoxide, methane and other unburned hydrocarbons.
Background technique
Rock gas mainly is comprised of methane.Rock gas acts as a fuel and burns in internal-combustion engine, because in many markets all over the world, rock gas is compared cost with diesel oil or gasoline from energy angle less.In addition, rock gas is compared with diesel oil or gasoline, and burning is cleaning more, and this can help improve air quality, thereby another motivation that vehicle motor with burning diesel oil or gasoline uses the vehicle motor of gas-firing to replace is provided.Yet the exhausting air of discharging from the firing chamber of internal-combustion engine, the residual unburned fuel of meeting is also like this for the motor take rock gas as fuel.Because methane is a kind of gas that causes greenhouse effect, people wish will not fire methane oxidation before exhausting air is left the outlet pipe of vehicle.
Several different methods be used for burning rock gas at motor is arranged.The actual mixing ratio that so-called stoichiometric natural gas engines is used is approximately 14.6: 1, and it is corresponding to λ=1, because λ is by calculating actual mixing ratio divided by 14.6 (these are theoretic stoichiometric ideal air-fuel ratio).As defined herein, the motor that moves under stoichiometric mode needn't be strictly to equal 1.0 λ operation, but to be in or to get final product near 1.0 λ operation, like this, substantially there is no superfluous oxygen in the inflation (charge) of burned air and fuel in the firing chamber of motor.U.S. Patent No. 5,131,224 disclose a kind of minimizing from the method for the methane amount of exhaust emission of the motor take rock gas as fuel.Should ' 224 patent instruct, what adopt average slightly rich fuel (is also, λ is on average less than 1.0) air-fuel mixture moves natural gas engine under the stoichiometry operating mode, and use platinum or platinum-palladium (non-rhodium) catalytic converter to carry out exhausting air and process.As be known in the art, can be by reducing the discharging of NOx and methane with exhaust gas recirculation and three-way catalyst, but these technology can greatly increase system synthesis this.
So-called fuel-sean spark ignition (" LBSI ") natural gas engine triggers by spark plug the lean fuel mixture (lean mixture) that igniting comes gas-firing.Lean fuel mixture means, and superfluous oxygen is arranged, so λ is greater than 1 in the firing chamber.Compare with the stoichiometric natural gas engines of not utilizing three-way catalyst to move with exhaust gas recirculation, the LBSI natural gas engine is comparatively uncomplicated and cost is lower, produce simultaneously lower nitrogen oxide (NOx) discharging, because higher air fuel ratio causes lower combustion temperature.Compare with stoichiometric natural gas engines, the LBSI natural gas engine also produces lower CO2 emission.Thereby, to compare with the stoichiometric natural gas engines that does not adopt exhaust gas recirculation or three-way catalyst, the LBSI motor has cost and performance advantage.Yet a problem of LBSI natural gas engine is, methane oxidation catalyst can be suppressed owing to being exposed to oxysulfide (SOx), also can be like this even sulfoxide concentration is extremely low, thus cause the methane oxidation transformation efficiency to descend.It is believed that, SOx is arrived on catalyst wash coat (wash coat) by chemical absorption, thereby effectively stops the conversion position of methane.For example, experimental result shows, it is only the SOx concentration level of 1ppm (w/w), within less than the working time of 50 hours, can cause methane conversion efficiency to reduce by 25%, and such concentration can be incorporated in engine exhaust gas by the sulphur that is present in rock gas and engine lubricating oil.For example, the contributor of SOx in exhausting air added the odorant that is used for olfactometry in rock gas usually.
Engelhard company is that the portion that GRI (Gas Research Institute) writes is entitled as " Catalyst Development for Methane EmissionsAbatement From Lean Burn Natural Gas Vehicles (being used for reducing from the fuel-sean Natural gas vehicles catalyst development of discharge of methane) ", bear the date of the report in November, 1997, reported and completed between year May in January, 1994 to 1997, purpose is the work of the catalytic converter of a kind of fuel-sean Natural gas vehicles of exploitation, this catalytic converter will be at the whole length of life of vehicle oxidizing of methylene constantly.The catalyzer that contains palladium (Pd) is as palladium/aluminium oxide (Al
2O
3), be found to be for subdue the most active catalyzer of discharge of methane from natural gas engine.Engelhard company reports in its Final Report, and it fails to reach its purpose, because the SOx that is present in the exhausting air of motor has suppressed catalyst activity.The research of Engelhard company concentrates on the deactivation mechanism of developing a kind of sulfur resistant catalyst and investigate the palladium oxidation catalyst under the laboratory condition of closely class vraisemblance Natural gas vehicles exhaust.
Published SAE technical paper 961971, be entitled as " Methane EmissionsAbatement from Lean Burn Natural Gas Vehicle Exhaust:Sulfur ' sImpact on Catalyst Performance (subdue discharge of methane from the exhaust of fuel-sean Natural gas vehicles: the impact of sulphur on catalyst performance) ", its author is the employee of Engelhard company.At the 18th page of this SAE technical paper, the author discloses a kind of strategy of cyclical heat reducing/regenerating, makes catalyzer in the situation that exist sulphur to keep acceptable activity.Particularly, disclosed strategy comprises, the operation natural gas engine is with recycling catalyst between the fuel-sean that continues 14.5 minutes, high space velocity pattern and the richness combustion that continues 30 seconds, low spatial velocity mode.Catalyst temperature is from about 650 degrees centigrade during being elevated to rich combustion pattern at 550 degrees centigrade during the fuel-sean pattern.The author draws from their experimental result, and this strategy has only postponed the final decay of catalyst methane activity.
No. JP20002000058777, the Japanese patent application of having announced (publication No. JP2003254117A2), be entitled as " Exhaust Emission Controlling Method (exhaust emissions controlling method) " (' 58777 application), be similar to SAE technical paper 961971, this application discloses a kind of alternately in the method for combustion fuel under the fuel-sean atmosphere of excess air and under the rich combustion gas atmosphere of excess of fuel.Be derived from the exhausting air of combustion fuel under rich combustion gas atmosphere, make downtrod catalyzer position be subject to the reducing atmosphere impact, this reducing atmosphere makes the position regeneration of downtrod catalyzer, thereby it is active and recover the methane oxidation conversion ratio to recover methane oxidation catalyst.According to ' 58777 applications, can be by when calculating the methane conversion efficiency of the catalyzer prearranging quatity that descends, determine to make the timing of downtrod catalyzer position regeneration, and this calculating comprises sulphur concentration, air fuel ratio and temperature of exhaust gas in exhausting air based on a plurality of parameters.The problem of this method is, it has increased the complexity of controlling this motor, because comprising, the method calculates the timing that makes methane oxidation catalyst desulphation, and the timing of two kinds of control strategies of operation motor under fuel-sean or rich combustion pattern because corresponding to depend in the timing that moves under richness combustion pattern can be on motor characteristic curve figure (engine map) that occur, the timing that calculate of any point.
Therefore, the demand of existence to improved control strategy, the motor of fuel is made in this improved control strategy operation with methane, simply, effectively to realize the advantage of the low emission that some are relevant to the LBSI motor of making fuel with methane, performance and the desulfurization by the management methane oxidation catalyst simultaneously reduces the discharging of not firing methane.
Summary of the invention
A kind of method is provided, and the method is used for operation to be made the motor of fuel with methane and processes exhausting air from this motor, to reduce the discharging of methane and nitrogen oxide.In the preferred embodiment of the method, motor is take rock gas as fuel.Disclosed method comprises, when on motor characteristic curve figure predetermined first concentrated when a bit moving motor, supply with lean fuel mixture for this motor and make fuel; When the predetermined second point on motor characteristic curve figure concentrate a bit move motor the time, supply with rich fuel mixture for this motor and make fuel; And make the exhausting air from this motor flow through methane oxidation catalyst.
For example, predetermined the second point set on motor characteristic curve figure can be associated with when this motor moves in predetermined high-engine speed range and in predetermined low engine load range.In a preferred method, by when, this motor is to be less than 20% load operation of maximum engine load, define this predetermined low engine load range, by when, this motor is thought at least 80% speed operation of maximum engine rotation speed, defines this predetermined high-engine speed range.Preferably, predetermined the second point set on motor characteristic curve figure, be associated with when this motor moves in predetermined engine speed range and in predetermined engine load range, wherein motor can, and be controlled as, move under the stoichiometry operating mode, and make the temperature of exhaust gas between this motor and methane oxidation catalyst be at least 600 degrees centigrade, more preferably between 650 degrees centigrade and 800 degrees centigrade.In one embodiment, with the predetermined engine load range of rich fuel mixture operation corresponding to when air-distributor pressure less than the about absolute pressure of 85kPa (approximately 12psia).
When motor moves with the stoichiometry operating mode, can pass through the air quality specific discharge of the firing chamber that intake manifold enters motor by minimizing, produce rich fuel mixture.In some embodiments, can by the air stream by inlet air pathway is carried out throttling, reduce the air quality specific discharge.What be equipped with turbosupercharger makes the motor of fuel with methane, can make a part in exhausting air walk around the turbine of this turbosupercharger by opening waste gate valve, reduces the air quality specific discharge.If turbosupercharger is variable geometry turbocharger or variable nozzle turbocharger, corresponding geometrical shape or nozzle all can be controlled, to reduce the air quality specific discharge.
In a preferred method, when motor moved with lean fuel mixture, the average lambda of the inflation that forms in the firing chamber was at least 1.3, and preferably between 1.3 and 1.7.The method can also comprise: make fuel for the motor supply of making fuel with methane comprises the fuel mixture of methane and hydrogen, and the control lean fuel mixture makes it to have the average lambda between 1.3 and 2.0.When motor moved with rich fuel mixture, the average lambda of the inflation that forms in the firing chamber was less than or equal to 1.0, preferably between 0.95 and 1.0.
This preferred method also comprises, starts a spark plug, promoting the igniting of fuel-sean material and rich fuel mixture, and when supplying with lean fuel mixture for motor and make fuel, with the timing advance to that starts this spark plug time of morning more.
The method preferably includes: in the situation that the palladium that is provided by methane oxidation catalyst is provided, make the described methane oxidation in exhausting air.In one embodiment, the palladium infiltration can be comprised in the wash coat of aluminium oxide, and this wash coat can be deposited on the ceramic monolith that comprises silicon carbide or Magnesiumaluminumsilicate (being called " steinheilite ").In some embodiments, the method can comprise wash coat is deposited on metallic carrier.
In some preferred methods, methane oxidation catalyst during take lean fuel mixture as fuel, promotes the oxidation of methane at motor, and, promotes reduction of nitrogen oxide is become nitrogen during take rich fuel mixture as fuel at motor.
The method can also comprise that the order motor is in point one period scheduled time of operation of a point of concentrating for the predetermined second point on motor characteristic curve figure, as a step in the initiating sequence of motor.If motor is prime mover of vehicle or machine, controller can be programmed to, identification is the predefine situation when static when described vehicle or machine, and the order motor moves one period scheduled time or until this vehicle is no longer static at the point that be a point concentrating of the predetermined second point on motor characteristic curve figure, is as the criterion with the time that arrives first.
Disclose a kind of motor of making fuel with methane, this motor of making fuel with methane comprises intake manifold, and it limits a path, and air can be by the firing chamber of this path inflow engine; Fuel metering valve, it can operate to regulate by the fuel supply pipe road introducing quality of fuel specific discharge firing chamber, that comprise methane; Be arranged in the throttle valve in intake manifold, be used for regulating the mass flowrate of the air of introducing the firing chamber; Gas exhaust manifold, it limits the path that is communicated with the firing chamber, is used for receiving products of combustion from the firing chamber, and products of combustion is directed into outlet pipe; Be placed in the methane oxidation catalyst of this outlet pipe; At least one sensor that is associated with the motor of making fuel with methane is for the λ that calculates or measure gas exhaust manifold or intake manifold; And electronic controller, it is programmed with the corresponding predetermined point on motor characteristic curve figure with one of fuel-sean pattern and rich fuel mode operation motor.
In a preferred embodiment, described at least one sensor is exhaust gas oxygensensor, it is with the sensing probe that is placed in methane oxidation catalyst upstream described in gas exhaust manifold or outlet pipe, and this exhaust gas oxygensensor can operate to send the signal of the expression λ value of being surveyed to electronic controller.
In another preferred embodiment, described at least one sensor comprises the first mass flow sensor of being associated with intake manifold and the second mass flow sensor that is associated with the fuel supply pipe road, and this first and second mass flow sensor can operate to send the signal of the corresponding air of expression and fuel mass specific discharge to electronic controller, and this electronic controller is able to programme to calculate the λ of the inflation that forms in the firing chamber.
In another preferred embodiment, described at least one sensor comprises: the first temperature transducer that is associated with intake manifold; The first pressure transducer that is associated with intake manifold; The second temperature transducer that is associated with the fuel supply pipe road; The second pressure transducer that is associated with the fuel supply pipe road; And electronic controller is able to programme to process the data of collecting from the first and second temperature transducers and the first and second pressure transducers, to calculate the λ of the inflation that forms in the firing chamber.
In preferred equipment, methane oxidation catalyst comprises palladium.Palladium can be comprised in the wash coat of aluminium oxide by infiltration, and this wash coat can be deposited on the ceramic monolith that comprises silicon carbide or Magnesiumaluminumsilicate.In another embodiment, this wash coat can be deposited on metallic carrier.
Methane oxidation catalyst is comprised of Multiple components.Generally speaking, preferably methane oxidation catalyst comprises at least a catalytic active component, namely selects the precious metal of the group of free palladium, platinum and rhodium composition.Methane oxidation catalyst preferably also comprises at least a storage oxygen composition, the group that this storage oxygen composition selects the combination (combination) of free cerium dioxide (being called " ceria ") and cerium and zirconium to form.In addition, methane oxidation catalyst preferably also comprises the scavenger for hydrogen sulfide.Methane oxidation catalyst can be to use the three-way catalyst of the sort of type of developing for automobile, although the formula of this catalyzer not yet is developed for make the lean-burn automotive of fuel with methane.
In a preferred embodiment, when motor moves under the fuel-sean pattern, methane oxidation catalyst comprises the palladium for oxidizing of methylene, and when motor moved under stoichiometric mode, methane oxidation catalyst also comprised for reduction of nitrogen oxide being become the rhodium of nitrogen.Methane oxidation catalyst can also comprise the cerium dioxide that serves as storage oxygen composition and for the scavenger of hydrogen sulfide.
Fuel can adopt various ways to introduce the intake manifold of motor.For example, motor can comprise port fuel injection valve, is used for the air inlet port of fuel introducing between intake manifold and firing chamber.In another embodiment, can adopt shower nozzle (sparger) will introduce from the fuel of fuel supply line the upstream of throttle valve in intake manifold.Replace shower nozzle, motor can comprise a plurality of ports in the wall that is in the throttle valve upstream that is arranged on intake manifold, wherein can flow through described a plurality of port and enter intake manifold from plenum chamber from the fuel in fuel supply pipe road.The advantage that this layout is compared with shower nozzle is, it does not stop any circulation area by intake manifold.
In yet another embodiment, motor can comprise with the Fuelinjection nozzle that is placed in the nozzle in the firing chamber, is used for this fuel is directly introduced the firing chamber.Fuel can be introduced into the firing chamber during aspirating stroke or when the pressure of the early stage firing chamber of compression stroke is still low.
Disclosed the present invention compared with prior art has advantage.Compare with the motor with the mixture operation of richer fuel that stoichiometric engines take rock gas as fuel or ' 244 patent are instructed, motor disclosed herein and method can be with the fuel-sean mode operations in most of time, to realize lower NOx and CO2 emission, simultaneously when this motor moves in the presumptive area of motor characteristic curve figure, only with rich fuel mixture operation.The author of SAE technical paper 961971 described a kind of operation 14.5 minutes under the fuel-sean pattern, under rich fuel mode the method in 30 seconds of operation, but their conclusion is that the method has only postponed the final decay of catalyst performance.Be different from the method for instructing in SAE technical paper 981971, the experimental result of method and apparatus disclosed herein shows, the methane oxidation catalyst performance can be restored to 85% to 90% methane conversion under maximum fueling level.Method disclosed herein also more easily realizes than the circulation of timing cycle catalyst desulfurizing, because need to be for two kinds of fuel-sean and rich fuel mode parallel engine control strategies.In the situation that adopt regularly desulphurization circulating, when carrying out the time of desulphurization circulating when being in, therefore motor may move under the situation of the arbitrary position on motor characteristic curve figure, needs for each operating point on motor characteristic curve figure the control strategy that walks abreast.Adopt method and apparatus disclosed herein, when motor moved in the presumptive area of motor characteristic curve figure, this motor was only with rich fuel mode operation.Japanese patent application also discloses a kind of method of periodically switching for No. JP20002000058777 between fuel-sean and rich operating fuel pattern, but the method has the identical shortcoming of method of instructing with SAE technical paper 981971.
Therefore, method and apparatus disclosed herein provides a kind of approach of the motor of fuel of doing with methane for operation, compares with the stoichiometric engines of making fuel with methane, and it can reduce the discharging of NOx and carbon dioxide.Experimental result shows, the motor that disclosed method and apparatus can allow to make fuel with methane at most of time with the fuel-sean mode operation, and simultaneously when this motor moves in the presumptive area of motor characteristic curve figure by keep the transformation efficiency of methane oxidation catalyst with rich fuel mode operation.
Description of drawings
Fig. 1 is the schematic diagram be used to the equipment of implementing disclosed method.This equipment comprises fuel injection system, engine chamber, catalytic converter and electronic controller.In this embodiment, port injector is used to fuel is introduced the air inlet port, and the exhaust gas oxygensensor that is placed in the upstream of outlet pipe methane oxidation catalyst is used to control the air fuel ratio of the inflation that is sent to the firing chamber.
Fig. 2 is the schematic diagram be used to the second embodiment of the equipment of implementing disclosed method.The equipment class of Fig. 2 is similar to the equipment in Fig. 1, has just adopted shower nozzle that fuel is introduced intake manifold, and is used for the air enter and quality of fuel flow transducer and is used to substitute exhaust gas oxygensensor and is sent to the air fuel ratio of the inflation of firing chamber with control.
Fig. 3 is the schematic diagram be used to the 3rd embodiment of the equipment of implementing disclosed method.Equipment class in the equipment of Fig. 3 and Fig. 1 and Fig. 2 seemingly, just fuel can be introduced intake manifold by a plurality of ports, and the air that employing temperature and pressure sensor measurement enters and the temperature and pressure of fuel, make electronic controller can calculate air and quality of fuel flow, thereby control the air fuel ratio of the inflation that is sent to the firing chamber.Fig. 3 also shows the embodiment with the turbo charge system that comprises turbosupercharger and wastegate.Motor with turbo charge system can be controlled with this turbo charge system the air fuel ratio of the inflation that is sent to the firing chamber.
Fig. 4 is a width motor characteristic curve figure, show on this performance diagram, motor can lean fuel mixture the zone of operation and motor can rich fuel mixture operation the zone.
Fig. 5 is for the plotted curve of different engine, λ and engine load.Drawn many lines, every line is corresponding to a different engine speed.This figure shows the application of described method with way of example, shown how to move motor with most of engine speed and engine load under the fuel-sean situation, and show that target λ can be confirmed as the function of engine speed and load.
Fig. 6 is the plotted curve of methane concentration and time, and showing should by using the revival to methane oxidation catalyst that disclosed method causes.The data that indicate are from experimental result, and it has demonstrated disclosed method in the effect that makes aspect methane oxidation catalyst regeneration.
Embodiment
With reference to accompanying drawing, with similar reference character, the parts that title is similar of 100 the multiple of being separated by, at the similar parts of different embodiment middle fingers.
Fig. 1 is the schematic diagram be used to the equipment 100 of implementing disclosed method.This equipment comprises fuel injection system 110, engine chamber 120, catalytic converter 140 and electronic controller 150.In this embodiment, fuel injection system 110 comprises port injector 112, and port injector 112 will be introduced air inlet port 116 from the fuel of fuel supply line 114.Air is by intake manifold 118 flowing in combustion chambers 120, and throttle valve 119 is regulated the Air Flow of process intake manifold 118.Firing chamber 120 is limited by cylinder block 122, piston 124 and cylinder head 126.Motor can comprise spark plug 128, and spark plug 128 is used for triggering the igniting of the inflation in firing chamber 120.As known for internal-combustion engine, air intake valve 130 can operate to control from intake manifold 118 and enter the air of firing chamber 120 and flowing of fuel mixture, drain tap 132 can operate with the control combustion product from the firing chamber 120 flowing to gas exhaust manifold 134.Exhausting air flows to the methane oxidation catalyst that is arranged on catalytic converter 140 inside from gas exhaust manifold 134.Above-mentioned exhausting air is from catalytic converter 140 flow direction engine outlet pipes 142.
In by the embodiment shown in Fig. 1, exhaust gas oxygensensor 152 is placed in the gas exhaust manifold 134 that is in the methane oxidation catalyst upstream.Be used to control the air fuel ratio of the inflation that is sent to the firing chamber from the λ measurement of sensor 152.According to disclosed the present invention, adopt the data that receive from exhaust gas oxygensensor 152, electronic controller 150 able to programme with under most of operation conditionss with fuel-sean mode operation motor, the inflation that wherein is sent to firing chamber 120 has the average lambda greater than 1.1.In the predetermined running situation on some predefined motor characteristic curve figure under---for example the predefine scope of the predefine scope of engine speed and engine torque---, motor is controlled as with richer air-fuel mixture operation, wherein be sent to λ that the inflation of firing chamber 120 has and be less than or equal to approximately 1.0, and preferably between 0.95 and 1.0.In the embodiment of Fig. 1, the λ that electronic controller 150 is processed from exhaust gas oxygensensor 152 measures, and determines for given engine speed and the currency of engine torque according to motor characteristic curve figure, and what target λ is.In this embodiment, because be difficult to measure λ in the firing chamber, and because adopting port injector, fuel injection system is difficult to measure the λ of upstream, firing chamber, so exhaust gas oxygensensor is arranged in gas exhaust manifold 134.Yet the λ that obtains according to the arbitrfary point of catalytic converter 140 upstreams in gas exhaust manifold 134 or in outlet pipe measures, and electronic controller 150 can be determined the λ in firing chamber 120.therefore, use the λ that obtains by sensor 152 to measure, electronic controller 150 can be controlled λ according to motor characteristic curve figure with throttle valve 119 and port injector 112, make the motor most of time with fuel-sean mode operation (average lambda is between 1.3 and 1.7), and (λ is less than or equal to approximately 1.0 with stoichiometric mode operation in the presumptive area of motor characteristic curve figure, and preferably between 0.95 and 1.0), and pass through the method, methane oxidation catalyst is periodically regenerated and is driven away sulphur with the active site from catalyzer, and recovery methane conversion efficiency.
Fig. 2 is the schematic diagram of the second embodiment that can be used for implementing the equipment of disclosed method.Equipment 200 is similar with equipment 100, just shower nozzle 212 is used to fuel is introduced intake manifold, and be respectively used to measure the air that enters and the mass flow sensor 254 and 256 of quality of fuel flow and be used to replace exhaust gas oxygensensor, be sent to the air fuel ratio of the inflation of firing chamber with control.
Fig. 3 is the schematic diagram of the 3rd embodiment that can be used for implementing the equipment of disclosed method.Equipment 300 uses from the fuel supply pipe road the 314 port rings 312 that lead to intake manifold 318, and the air that employing temperature and pressure sensor measurement enters and the temperature and pressure of fuel, make electronic controller can calculate air and quality of fuel flow, thereby control the air fuel ratio of the inflation that is sent to the firing chamber.
In this embodiment, can be directed to the turbine of turbosupercharger 338 from the exhausting air of gas exhaust manifold 334 outflows, perhaps can by operation waste gate valve 336, be directed getting around this turbine.Suction port 316 to turbosupercharger 338, then arrives intake manifold 318 by air flue 317 with inlet guide.Known to the technician of technical field of engines, turbosupercharger 338 is by exhaust gas-driven, and can be used to increase the pressure of air inlet.After exhausting air flowed out this turbine, outlet pipe 339 was with the exhausting air catalytic converter 340 that leads.When waste gate valve 336 was opened, exhausting air was flowed through outlet pipe 337 to catalytic converter 340.The turbine of turbosupercharger 338 can be variable geometry turbine or variable nozzle turbine.By controlling wastegate to control the amount by the exhausting air of this turbine, and/or by controlling geometry-variable or the nozzle of this turbine, MAF through intake manifold 118 is controlled, can control λ with fuel metering valve 315 Collaboration thus.Be also, can be by controlling fuel metering valve 315 and throttle valve 119, and in conjunction with one of following, λ is controlled: wastegate 336, or the geometry-variable of turbosupercharger 338 or variable nozzle turbine, or geometry-variable or the variable nozzle turbine of wastegate 336 and turbosupercharger 338.
Be similar to other embodiments, equipment 300 can be used for the method implementing to discuss.Electronic controller 350 can calculate the air quality specific discharge according to the measurement that obtains by air temperature sensor 358 and air pressure probe 360.Similarly, electronic controller 350 can come the computing fuel mass flowrate according to the measurement that obtains by fuel temperature sensor 362 and fuel pressure sensor 364.Then electronic controller 350 can with reference to motor characteristic curve figure, be determined required operating mode (fuel-sean or stoichiometry) based on the present engine operation conditions.When motor moved in the presumptive area of motor characteristic curve figure, electronic controller 350 control fuel metering valves 315 and throttle valve 319 were to be sent to the firing chamber with richer fuel mixture, and preferably λ is between 0.95 and 1.0.With a bit moving beyond the presumptive area of richer fuel mixture operation the time, electronic controller 350 is controlled fuel metering valves 315 and throttle valve 319 to transmit lean fuel mixture to the firing chamber when motor, and preferably average lambda is between 1.1 and 1.7.
Fig. 1 to 3 has illustrated the different embodiments for the equipment of implementing disclosed method.
Those skilled in the art can understand, and can not depart from the spirit and scope of disclosed equipment and shown embodiment is made change.For example, the port ring 312 that is used for fuel is introduced intake manifold shown in Fig. 3 can replace the shower nozzle with effect same 212 in Fig. 2.In other variation, the exhaust gas oxygensensor of Fig. 1 can replace the sensor in the embodiment shown in Fig. 2 and Fig. 3, or the fuel mass flow sensor in Fig. 2 256 can replace the pressure and temperature sensor 362 and 364 in the embodiment of Fig. 3.The key character of disclosed equipment is: at least one sensor that is associated with the motor of making fuel with methane---its measurement can be used for directly calculating or measuring the parameter of the λ in gas exhaust manifold or intake manifold by the electronic engine control device; The combination of one or more like this sensors and electronic engine control device, its can order and control engine under most of operation conditionss with the fuel-sean mode operation, and to move close to stoichiometric richer fuel mixture, make λ be less than or equal to about 1.0 under the predetermined state that is defined by motor characteristic curve figure.
Fig. 4 is the illustration of motor characteristic curve figure, wherein engine torque on the y axle and engine speed on the x axle.Line 400 defines the torque upper limit of motor, make online 400 and the x axle between the space be the range of operation of motor.Axle in Fig. 4 and not shown unit because this figure illustration this present disclosed method approach of instructing, the method can be applicable to the motor characteristic curve figure of any motor.According to the method, motor is controlled under most of operation conditionss with the fuel-sean mode operation, and moves with stoichiometric mode under some predetermined running situation.In Fig. 4, zone 401 be on the motor characteristic curve figure that illustrates, motor is controlled to the space of fuel-sean mode operation.Also namely, when engine torque and engine speed limited on motor characteristic curve figure some in zone 401, the air fuel ratio in the engine controller controls intake manifold was to inflate according to transmitting to the firing chamber of motor greater than 1.1 average lambda.The border of line 402 localized areas 403, zone 403 is on motor characteristic curve figure, motor is controlled to the presumptive area close to stoichiometric richer fuel mixture operation.Also namely, when engine torque and engine speed limited on motor characteristic curve figure some in zone 403, the engine controller controls air fuel ratio was to inflate according to transmitting to the firing chamber of motor between the about average lambda between 0.95 and 1.0.
In Fig. 4, the presumptive area of the fuel mixture that limit by line 402, that burning is richer is arbitrarily to a certain extent.This presumptive area can be the arbitrary region on motor characteristic curve figure, is frequently used but represent in the zone of the small scale that the normal operation of expection circulates but preferably be in, and makes motor mainly with the fuel-sean mode operation.In addition, as hereinafter about Fig. 6 in greater detail, for reduce the time that catalyzer is carried out oxidation when desulphurization circulating finishes, preferably, select to carry out the zone of stoichiometry operation on motor characteristic curve figure, make when motor moves under the stoichiometry operating mode should the zone in temperature of exhaust gas usually above 600 degrees centigrade, more preferably, higher than 650 degrees centigrade.
Fig. 5 shows for different engine, plotted curve λ and engine load, and it can be used for realizing motor characteristic curve figure shown in Figure 4.The legend of right-hand side has provided the unique mark that is used for drawing from the corresponding line of the different engine running speed take rpm as unit in Fig. 5.According to disclosed method, for the most of points on motor performance curve figure, motor moves under greater than 1.1 fuel-sean pattern in average lambda.Be programmed into the desirable λ in motor characteristic curve figure, along with engine speed changes, along with engine load increases and increases gradually, and also usually higher for the desirable λ of higher engine speed.The exception of this pattern is, (this is when λ is less than or equal to 1.0 in this embodiment) this motor is just in predefined engine speed and load range in operation when motor moves under " stoichiometry " operating mode, or motor forwards in normal fuel-sean operating mode from the stoichiometry operating mode.In the embodiment of Fig. 5, for the stoichiometry operating mode, this predefined engine speed range be 2500 and 2800rpm between, and this predefined engine load range is from 0 to about 20% of maximum load.When engine speed be 3000rpm and engine load less than maximum engine load 50% the time, λ is controlled as the value that helps to be transformed into from the stoichiometry operating mode fuel-sean operating mode, vice versa.
Follow a series of predetermined λ value that is confirmed as the function of engine load and engine speed, disclosed method can be used for moving motor at most of time to reduce engine emission, simultaneously when the periodic desulphation of automatically carrying out methane oxidation catalyst under the fuel-sean situation under the stoichiometry operating mode when motor under predefined situation moves.
Fig. 6 is the plotted curve of laboratory data, and it shows disclosed method and makes because absorbing the effect aspect the methane oxidation catalyst regeneration that SOx is suppressed.This Data Collection is from the Cummins take rock gas as fuel
TM5.9 rise motor.Methane oxidation catalyst comprises the catalysed oxidation aluminium wash coat that is impregnated with palladium, and this wash coat is deposited on the carrier that comprises Magnesiumaluminumsilicate.In other embodiments, carrier can be metal or silicon carbide.Fig. 6 has drawn the methane concentration in the exhausting air in methane oxidation catalyst downstream, wherein concentration with 1,000,000/... be (ppm) that unit is measured.The data declaration of drawing in Fig. 6 switch to the stoichiometry operating mode to the impact of methane concentration from the fuel-sean operating mode.Side leftward, motor just moves under the fuel-sean operating mode, and methane concentration is about 675ppm.In shown data, the transformation efficiency of methane oxidation catalyst is significantly descended, so that the power of regeneration of disclosed method to be described better.Also namely, at the left-hand side of figure, the methane conversion efficiency of catalyzer is approximately 65%, and causes catalytic activity by severe inhibition because of the active site that SOx is absorbed methane oxidation catalyst.By disclosed method to methane oxidation catalyst desulphation after, methane conversion efficiency returns to 85-90%.By implementing disclosed method, no matter when motor operate in motor characteristic curve figure, engine controller is programmed and with the part of stoichiometry operating mode operation motor, desulfurization occurs in the capital, and according to the size in the stoichiometry zone on motor characteristic curve figure and the normal operational cycle of motor, desulfurization can be enough frequency carry out, thereby prevent that methane oxidation catalyst is suppressed to the degree shown in Fig. 6, and make methane conversion efficiency is returned to the required time of 85-90% still less.
In Fig. 6, as shown in legend, contrast identical time scale and drawn three groups of data.With 1,000,000/... the methane concentration of (ppm) measuring for unit and the engine torque of measuring take Nm as unit are shared in tape unit, identical scale from 0 to 1000 on the y axle of LEFT HAND SIDE.The engine speed of measuring take rpm (rpm) as unit is used tape unit on dexter y axle, scale from 0 to 3000.Locate about 1220 seconds of the time scale that indicates, engine operation mode is the fuel-sean pattern between 1.4 and 1.5 from λ, switches to average lambda and is about 1 stoichiometric mode.For in collecting the test that these data carry out, engine speed keeps constant until desulphurization circulating finishes, but engine load reduces, as the engine speed and engine torque drawn as shown in.This simulated motor characteristic curve figure, engine speed switches to the stoichiometry operating mode in being maintained at 20% the presumptive area that about 2800rpm and engine load be far smaller than maximum load.Exist to the variation of engine load and make methane oxidation catalyst to some relevant transient effects of the heating of higher temperature for what the help desulfurization was carried out.In the data of the methane concentration of drawing, because the position of methane transducer is in the downstream of methane oxidation catalyst, at the methane concentration of measuring with just may have delay between the methane concentration from the exhaust stream that the catalytic converter of depositing methane oxidation catalyst leaves.
Fig. 6 illustrates, and adopts disclosed method, and the regeneration of the methane oxidation catalyst realized by desulfurization can occur within the very short period.Methane conversion superfluous in exhausting air is carbon monoxide and hydrogen, and hydrogen is by generating H with reaction of Salmon-Saxl
2S and H
2SO
4And when removing SOx from methane oxidation catalyst, desulfurization occurs.In the experiment of carrying out, the approximately 60 seconds period of moving under the stoichiometry operating mode, but methane oxidation catalyst desulphation is approximately to complete after 40 seconds.In this experiment, because switching is manual execution, time that motor moves under the stoichiometry operating mode is longer than the required time of desulfurization occurs, and by allowing time of operation motor over the required time of desulfurization, has confirmed that desulfurization completes with the maximum possible limit.Also namely, show that in the increase of about 1260 seconds mark methane concentrations desulfurization completes.When motor is switched back to the fuel-sean operating mode, and transient effect has been when having gone down, and measured methane concentration confirms, methane conversion efficiency has returned to 85-90%.
Although not shown in Fig. 6, when motor switched to the stoichiometry operating mode, the temperature that is directed to the exhausting air of methane oxidation catalyst raise.In the test that produces data shown in Figure 6, under the fuel-sean operating mode before 1220 seconds marks, even adopt engine torque higher with respect to the desulfurization period, the temperature that enters the exhausting air of catalytic converter also is approximately 645 degrees centigrade.When motor switched to the stoichiometry operating mode, engine torque was much lower, but the temperature that enters the exhausting air of catalytic converter increases to approximately 700 degrees centigrade.Temperature of exhaust gas preferably keeps below 800 degrees centigrade, because can damage methane oxidation catalyst higher than the temperature of this temperature.When switching back the fuel-sean operating mode after mark in 1275 seconds, the temperature that enters the exhausting air of catalytic converter is fallen back approximately 645 degrees centigrade when motor.Can believe, when the temperature of methane oxidation catalyst during lower than 600 degrees centigrade, the desulfurization of methane oxidation catalyst is relatively poor, and for select for the laboratory data of drawing in Fig. 6, the presumptive area with the operation of stoichiometry operating mode in motor characteristic curve figure, when moving with high-engine rotating speed and low engine torque under the stoichiometry operating mode, exhausting air is in the ideal temperature that methane oxidation catalyst is carried out desulfurization.
Can believe, when methane oxidation catalyst was in oxidation state, methane oxidation catalyst was more effective aspect oxidizing of methylene, and by disclosed desulphurization circulating with sulphur after the active site of this catalyzer is driven away, methane oxidation catalyst is not oxidized.Therefore, after moving motor with the stoichiometry operating mode and completing desulphurization circulating, when motor switches back the fuel-sean operating mode, the methane conversion efficiency of catalyzer is not recovered, until methanation catalyst is oxidized, this has explained, after switching to normal fuel-sean operating mode from the desulfurization pattern, and some transient effects of observing in measured methane concentration.
Under normal operation conditions, when putting into practice disclosed method, motor may move under stoichiometric conditions in the random time lag.For example, when vehicle just at downshift or when sliding under the direction which a grave faces, motor may be temporary transient designated on motor characteristic curve figure carry out moving in the zone of stoichiometry operation.Can select predetermined engine speed on motor characteristic curve figure and the size of load range based on the expection operation period of motor, so that enough periods of automatic regeneration methane oxidation catalyst to be provided.No matter when motor moves under the predefine situation that is associated with the stoichiometry operating mode, and methane oxidation catalyst can holomorphosis or partial regeneration, and this depends on the time span that motor moves under the stoichiometry operating mode.
Because methane oxidation catalyst can be within short time interval (in EXPERIMENTAL EXAMPLE, when catalyzer during by severe inhibition, about 40 seconds) holomorphosis, so the initiating sequence of motor can comprise the engine warm-up sequence alternatively---this engine warm-up sequence comprises the desulfurization to methane oxidation catalyst, like this, motor can by by means of the regeneration methane oxidation catalyst, methane conversion efficiency being returned to higher level, begin each operation circulation.Also namely, as the part of initiating sequence, engine controller can be programmed to order that motor is in motor characteristic curve figure, move one period scheduled time in zone that motor moves under the stoichiometry operating mode.In another embodiment, when stationary vehicle, engine controller can be programmed to move under stoichiometric mode in other scheduled times.For example, if the disclosed motor of making fuel with methane is prime mover of refuse collection vehicle, static and engine controller identifies that the operator has stopped to pick up or when toppling over Loaded goods when this refuse collection vehicle, engine controller can order motor one period predetermined time of operation under the stoichiometry operating mode or move to this vehicle ordered begin from its position of rest mobile till.In these examples (scheduled time when startup and stationary vehicle), same method is used for the desulfurization of methane oxidation catalyst.Also namely, move under the stoichiometry operating mode in the presumptive area of motor in motor characteristic curve figure.Unique difference is, engine controller can be programmed to, when engine controller identifies predetermined operation conditions, at the part of this performance diagram operation motor, rather than when motor in the normal processes of operation motor when the part of this performance diagram is moved.
Although illustrated and described concrete key element of the present invention, embodiment and application, yet be understandable that, the present invention is not limited to this, because those skilled in the art can be under the prerequisite of the scope that does not depart from present disclosure, especially according to aforementioned instruction, modify.
Claims (45)
1. the operation motor of making fuel with methane is to reduce discharged nitrous oxides and to process exhausting air from described motor to reduce the method for discharge of methane, and described method comprises:
When on motor characteristic curve figure predetermined first concentrated when a bit moving described motor, supply with lean fuel mixture for described motor and make fuel;
When the predetermined second point on motor characteristic curve figure concentrate a bit move described motor the time, supply with rich fuel mixture for described motor and make fuel; And
Make from the exhausting air of the described motor methane oxidation catalyst of flowing through,
It is at least 600 degrees centigrade that described predetermined the second point set on wherein said motor characteristic curve figure is associated with described motor when operation and the temperature of exhausting air of when discharging the firing chamber of described motor in predetermined high-engine speed range and in predetermined low engine load range, the described motor of described predetermined second point transporting something containerized row on described motor characteristic curve figure is provided for making enough periods of described methane oxidation catalyst regeneration thus, wherein in most of time with the described motor of fuel-sean mode operation.
2. by when, described motor defines with 20% load operation less than maximum engine load for method according to claim 1, wherein said predetermined low engine load range.
3. method according to claim 1, wherein said predetermined high-engine speed range by when described motor think that at least 80% speed of maximum engine rotation speed moves to define.
4. method according to claim 1, wherein said predetermined high-engine speed range is between 2500rpm and 2800rpm.
5. method according to claim 1, wherein said predetermined low engine load range corresponding to when air-distributor pressure less than the absolute pressure of 85kPa.
6. it is at least 650 degrees centigrade and lower than 800 degrees centigrade that method according to claim 1, described predetermined the second point set on wherein said motor characteristic curve figure are associated with described motor when operation and the temperature of exhausting air of when discharging the firing chamber of described motor in predetermined high-engine speed range and in predetermined low engine load range.
7. method according to claim 1 wherein produces described rich fuel mixture by the air quality specific discharge that described motor is led in reduction.
8. method according to claim 7, wherein reduce described air quality specific discharge by the air stream by inlet air pathway being carried out throttling.
9. method according to claim 7 wherein when the described engine assembly of making fuel with methane has turbosupercharger, reduces described air quality specific discharge by opening waste gate valve.
10. method according to claim 7, wherein reduce described air quality specific discharge by the geometrical shape of controlling variable geometry turbocharger.
11. method according to claim 7 wherein reduces described air quality specific discharge by the nozzle of controlling variable nozzle turbocharger.
12. method according to claim 1, wherein said lean fuel mixture has the average lambda at least 1.3.
13. method according to claim 1, wherein said lean fuel mixture has the average lambda between 1.3 and 1.7.
14. method according to claim 1 also comprises: supply with for the described motor of making fuel with methane the fuel mixture comprise methane and hydrogen and make fuel, and control described lean fuel mixture and make it to have average lambda between 1.3 and 2.0.
15. having, method according to claim 1, wherein said rich fuel mixture be less than or equal to 1.0 average lambda.
16. method according to claim 1, wherein said rich fuel mixture has the average lambda between 0.90 and 1.0.
17. method according to claim 1, also comprise: start a spark plug, promoting the igniting of described fuel-sean material and rich fuel mixture, and when supplying with described lean fuel mixture for described motor and make fuel, with the timing advance that starts described spark plug to more early time.
18. method according to claim 1, also comprise: when with the described motor of described rich fuel mixture operation, control described motor to use greater than 650 degrees centigrade and less than the temperature of 800 degrees centigrade, described exhausting air to be sent to described methane oxidation catalyst.
19. method according to claim 1 also comprises: for described motor is supplied with fuelled with natural gas.
20. method according to claim 1 also comprises: in the situation that the palladium that is provided by described methane oxidation catalyst is provided, the methane in described exhausting air is carried out oxidation.
21. method according to claim 20 also comprises: described palladium infiltration is comprised in the wash coat of aluminium oxide.
22. method according to claim 21 also comprises: described wash coat is deposited on the ceramic monolith that comprises silicon carbide or Magnesiumaluminumsilicate.
23. method according to claim 21 also comprises: described wash coat is deposited on metallic carrier.
24. method according to claim 1, wherein, described methane oxidation catalyst, when described motor acts as a fuel with lean fuel mixture, promote the oxidation of methane, and when described motor acts as a fuel with rich fuel mixture, promote reduction of nitrogen oxide is become nitrogen.
25. method according to claim 1, wherein said motor is prime mover of vehicle or machine, and a controller is programmed to identify the predefine situation when static when described vehicle or machine, and order described motor in the some operation of a point of concentrating for the described predetermined second point on described motor characteristic curve figure one period scheduled time or until described vehicle is no longer static, be as the criterion with the time that arrives first.
26. method according to claim 1, also comprise: order described motor in point one period scheduled time of operation of a point of concentrating for the described predetermined second point on described motor characteristic curve figure, as a step in the initiating sequence of described motor.
27. a motor of making fuel with methane comprises:
Intake manifold, it limits a path, and air can flow into by this path the firing chamber of described motor;
Fuel metering valve, it can operate to regulate by fuel supply pipe road introducing quality of fuel specific discharge described firing chamber, that comprise methane;
Throttle valve, it is inner that it is arranged on described intake manifold, is used for regulating the mass flowrate of the air of introducing described firing chamber;
Gas exhaust manifold limits the path that is communicated with described firing chamber, is used for receiving products of combustion from described firing chamber, and described products of combustion is directed into outlet pipe;
Methane oxidation catalyst, it is arranged in described outlet pipe;
Make with methane at least one sensor that the motor of fuel is associated with described, be used for calculating or measuring the λ of described gas exhaust manifold or described intake manifold; And
electronic controller, it is programmed with the corresponding predetermined point on motor characteristic curve figure with the described motor of one of fuel-sean pattern and rich fuel mode operation, it is at least 600 degrees centigrade that described predetermined point on described motor characteristic curve figure during wherein with the described motor of described rich fuel mode operation is associated with described motor when operation and the temperature of when discharging the exhausting air of described firing chamber in predetermined high-engine speed range and in predetermined low engine load range, the described motor of described predetermined point operation on described motor characteristic curve figure is provided for making enough periods of described methane oxidation catalyst regeneration thus, wherein in most of time with the described motor of fuel-sean mode operation.
28. motor according to claim 27, wherein said at least one sensor is exhaust gas oxygensensor, this exhaust gas oxygensensor is with the sensing probe that is placed in methane oxidation catalyst upstream described in described gas exhaust manifold or described outlet pipe, and described exhaust gas oxygensensor can operate to send the signal of the expression λ value of being surveyed to described electronic controller.
29. motor according to claim 27, wherein said at least one sensor comprises the first mass flow sensor of being associated with described intake manifold and the second mass flow sensor that is associated with described fuel supply pipe road, and described the first and second mass flow sensors can operate to send the signal of the corresponding air of expression and fuel mass specific discharge to described electronic controller, and described electronic controller is able to programme to calculate the λ of the inflation that forms in described firing chamber.
30. motor according to claim 27, wherein said at least one sensor comprises:
The first temperature transducer is associated with described intake manifold;
The first pressure transducer is associated with described intake manifold;
The second temperature transducer is associated with described fuel supply pipe road;
The second pressure transducer is associated with described fuel supply pipe road; And
Described electronic controller is able to programme, to process the data of collecting from described the first and second temperature transducers and described the first and second pressure transducers, to calculate the λ of the inflation that forms in described firing chamber.
31. motor according to claim 27, wherein said methane oxidation catalyst comprises palladium.
32. motor according to claim 31, wherein said palladium is comprised in the wash coat of aluminium oxide by infiltration.
33. motor according to claim 32, wherein said wash coat is deposited on the ceramic monolith that comprises silicon carbide or Magnesiumaluminumsilicate.
34. motor according to claim 32, wherein said wash coat is deposited on metallic carrier.
35. motor according to claim 31, wherein said methane oxidation catalyst also comprises rhodium.
36. motor according to claim 35, wherein said methane oxidation catalyst also comprises cerium dioxide.
37. motor according to claim 36, wherein said methane oxidation catalyst also comprises the scavenger for hydrogen sulfide.
38. motor according to claim 27, wherein said methane oxidation catalyst is three-way catalyst.
39. motor according to claim 27, wherein said methane oxidation catalyst comprise at least a precious metal of the group of selecting free palladium, platinum and rhodium composition.
40. described motor according to claim 39, wherein said methane oxidation catalyst also comprise at least one storage oxygen composition, this storage oxygen composition selects the group of the combination composition of free cerium dioxide and cerium and zirconium.
41. described motor according to claim 40, wherein said methane oxidation catalyst also comprises the scavenger for hydrogen sulfide.
42. motor according to claim 27 also comprises port fuel injection valve, this port fuel injection valve is used for the air inlet port of described fuel introducing between described intake manifold and described firing chamber.
43. motor according to claim 27 also comprises shower nozzle, this shower nozzle is used for the upstream that will introduce described intake manifold throttle valve from the described fuel in described fuel supply pipe road.
44. motor according to claim 27, also comprise a plurality of ports, described a plurality of port is arranged on the wall that is arranged in the throttle valve upstream of described intake manifold, wherein can flow through described a plurality of port from the described fuel in described fuel supply pipe road and enter in described intake manifold.
45. motor according to claim 27 also comprises Fuelinjection nozzle, this Fuelinjection nozzle is used for described fuel is directly introduced described firing chamber with the nozzle that is placed in described firing chamber.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002534031A CA2534031C (en) | 2006-02-03 | 2006-02-03 | Method and apparatus for operating a methane-fuelled engine and treating exhaust gas with a methane oxidation catalyst |
| CA2,534,031 | 2006-02-03 | ||
| PCT/CA2007/000161 WO2007087725A1 (en) | 2006-02-03 | 2007-02-01 | Method and apparatus for operating a methane-fuelled engine and treating exhaust gas with a methane oxidation catalyst |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101379279A CN101379279A (en) | 2009-03-04 |
| CN101379279B true CN101379279B (en) | 2013-11-06 |
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| CN2007800044135A Expired - Fee Related CN101379279B (en) | 2006-02-03 | 2007-02-01 | Method and apparatus for operating a methane-fuelled engine and treating exhaust gas with a methane oxidation catalyst |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1979596A4 (en) |
| CN (1) | CN101379279B (en) |
| CA (1) | CA2534031C (en) |
| WO (1) | WO2007087725A1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1032393C2 (en) * | 2006-08-30 | 2008-03-03 | Univ Delft Tech | Oxidation catalyst and method for removing organic compounds from gas mixtures. |
| GB0803670D0 (en) * | 2008-02-28 | 2008-04-09 | Johnson Matthey Plc | Improvements in emission control |
| NL2002711C2 (en) | 2009-04-03 | 2010-10-05 | Theodoor Petrus Knook | METHOD FOR PURIFYING SMOKE GASES FROM A GAS ENGINE |
| US20140069086A1 (en) | 2012-09-13 | 2014-03-13 | Leon A. LaPointe | Exhaust system for spark-ignited gaseous fuel internal combustion engine |
| DE102013012566A1 (en) * | 2013-07-29 | 2015-01-29 | Man Diesel & Turbo Se | Method for operating an internal combustion engine |
| DE102014226659A1 (en) * | 2014-12-19 | 2016-06-23 | Robert Bosch Gmbh | A method of operating a methane oxidation catalyst and exhaust aftertreatment system |
| DE102014226675A1 (en) * | 2014-12-19 | 2016-06-23 | Robert Bosch Gmbh | Method for monitoring a methane oxidation catalyst |
| US9482192B2 (en) * | 2015-01-02 | 2016-11-01 | Caterpillar Inc. | Stable combustion in spark-ignited lean-burn engine |
| DE102015001495A1 (en) * | 2015-02-05 | 2016-08-11 | Man Diesel & Turbo Se | Internal combustion engine and method for operating the same |
| DE102016205170A1 (en) * | 2016-03-30 | 2017-10-05 | Robert Bosch Gmbh | Method for monitoring a methane oxidation catalyst and exhaust aftertreatment device |
| CN109736934A (en) * | 2018-11-23 | 2019-05-10 | 河北华北柴油机有限责任公司 | A kind of natural gas engine |
| CA3193667A1 (en) | 2020-09-24 | 2022-03-31 | Tracy D. Staller | Apparatus, system, and method for oxidizing methane in a lean-burn engine exhaust |
| CN114645793B (en) * | 2022-05-23 | 2023-06-13 | 四川中能西控低碳动力装备有限公司 | Gas engine |
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| US6467258B1 (en) * | 1998-03-20 | 2002-10-22 | Ab Volvo | Method and arrangement for control of air-fuel ratio of combustion engine |
| JP2003254117A (en) * | 2002-03-05 | 2003-09-10 | Toyota Central Res & Dev Lab Inc | Exhaust emission controlling method |
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| US5738070A (en) * | 1996-12-11 | 1998-04-14 | Caterpillar Inc. | Method and apparatus for operation of a speed-governed lean burn engine to improve load response |
| US6021638A (en) * | 1997-11-24 | 2000-02-08 | Engelhard Corporation | Engine management strategy to improve the ability of a catalyst to withstand severe operating enviroments |
| US6244044B1 (en) * | 1999-09-20 | 2001-06-12 | Southwest Research Institute | Method for reducing cold-start hydrocarbon emissions in a gasoline, natural gas, or propane fueled engine |
| JP3622612B2 (en) * | 1999-12-24 | 2005-02-23 | 日産自動車株式会社 | Exhaust gas purification device for internal combustion engine |
| JP2002004912A (en) * | 2000-06-27 | 2002-01-09 | Toyota Motor Corp | Automobile with lean/rich operation combined map |
| SE517180C2 (en) * | 2001-02-09 | 2002-04-23 | Volvo Lastvagnar Ab | Device and method for controlling the ratio of fuel quantity to air quantity in a natural gas-powered internal combustion engine |
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- 2006-02-03 CA CA002534031A patent/CA2534031C/en not_active Expired - Fee Related
-
2007
- 2007-02-01 WO PCT/CA2007/000161 patent/WO2007087725A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6467258B1 (en) * | 1998-03-20 | 2002-10-22 | Ab Volvo | Method and arrangement for control of air-fuel ratio of combustion engine |
| JP2003254117A (en) * | 2002-03-05 | 2003-09-10 | Toyota Central Res & Dev Lab Inc | Exhaust emission controlling method |
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| CN101379279A (en) | 2009-03-04 |
| EP1979596A4 (en) | 2009-05-13 |
| CA2534031C (en) | 2008-06-10 |
| WO2007087725A1 (en) | 2007-08-09 |
| EP1979596A1 (en) | 2008-10-15 |
| CA2534031A1 (en) | 2006-04-19 |
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