CA1170521A - Apparatus for maintaining a diesel engine in restarting condition - Google Patents
Apparatus for maintaining a diesel engine in restarting conditionInfo
- Publication number
- CA1170521A CA1170521A CA000414510A CA414510A CA1170521A CA 1170521 A CA1170521 A CA 1170521A CA 000414510 A CA000414510 A CA 000414510A CA 414510 A CA414510 A CA 414510A CA 1170521 A CA1170521 A CA 1170521A
- Authority
- CA
- Canada
- Prior art keywords
- engine
- primary
- primary engine
- auxiliary
- heat exchanger
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N19/00—Starting aids for combustion engines, not otherwise provided for
- F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
- F02N19/04—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines
- F02N19/10—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines by heating of engine coolants
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
- F01M5/001—Heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
- F01M5/02—Conditioning lubricant for aiding engine starting, e.g. heating
- F01M5/021—Conditioning lubricant for aiding engine starting, e.g. heating by heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Abstract
14239:MRS
Abstract A large primary engine is maintained in readiness to start under low ambient temperature conditions by a small auxiliary engine having a liquid cooling system in parallel with the cooling system of the primary engine.
Exhaust from the auxiliary engine heats the coolant circulating through the two engines in a heat exchanger.
The lubricating oil from the primary engine is also heated by the auxiliary engine exhaust in the same heat exchanger.
A generator driven by the auxiliary engine charges the batteries used to start the primary engine.
Abstract A large primary engine is maintained in readiness to start under low ambient temperature conditions by a small auxiliary engine having a liquid cooling system in parallel with the cooling system of the primary engine.
Exhaust from the auxiliary engine heats the coolant circulating through the two engines in a heat exchanger.
The lubricating oil from the primary engine is also heated by the auxiliary engine exhaust in the same heat exchanger.
A generator driven by the auxiliary engine charges the batteries used to start the primary engine.
Description
1 17c)~21 APPARATUS FOR MAINTAINING A DIESEL ENGINE IN
RESTARTING CO~DITION
Field of the In~ention This invention relates to a standby system for main-taining a liquid cooled primary engine such as a large diesel engine in restarting condition under low ambient temperature conditions.
Bac~ground of the Invention Large diesel engines such as used in railroad locomotives, heavy earth-moving equipment and the like, can be difficult to start, particularly at low operating temperatures. Starting the diesel engines requires a large amount of electrical energy. The only source of electrical energy may be a bank of batteries whose ability to produce large amounts of energy is also adversely affected by low ambient temperature operating conditions. If the energy from the batteries is insufficient for starting, auxiliary power must be available. For these and other reasons, it is the practice to leave the engine running when not in use, particularly where the locomotive is in a yard or siding and auxiliary power is not readily available.
However, a locomotive may burn in the order of 6 to 8 gallons per hour, resulting in a substantial wasted fuel cost when measured in terms of the number of hours of locomotive non-use.
Various systems have heretofore been proposed to maintain an engine heated even though it has been shut down.
. .. .
S~l ~ - 2 For example, U.S. Patent Nos. 4,245,593 and 4, 249,491 show an arrangement for using an electric heater for preheating both the lubricating oil and the coolant of an engine to make it easier to start. Such an arrangement, however, required access to a source of electrical power, which may not always be available.
Using the heat from another enyine has also been proposed by providing a temporary connection between the two liquid cooling systems for transferring heat from one engine to another. See, for example, ~.S. Patent Nos. 3,373,728 and 4,051,825. Problems arise with such arrangements, including the possibility that the engine will be started and driven off with the heated water systems still attached. Trade union restrictions may also require special personnel to make the necessary interconnection. It also requires that another engine equipped with suitable connection attachments be available.
Summary of the Invention In accordance with the present invention there is provided a standby system for maintaining a liquid cooled primary engine in restarting condition at very low ambient temperatures after the primary engine is shut off, the primary engine being of a type having a liquid cooling system includiny a radiator connected to the primary engine for normally cooling a coolant liquid circulated through the engine block and the radiator, and an expansion tank into which the coolant drains, the standby system comprising:
~ 7(~S~
- 2a an auxiliary engine having a liquid cooling system, a heat exchanger having at least two fluid passages therethrough for transferring heat from one fluid to another, fluid passage means including a pump, the auxiliary engine cooling system, and one passage of the heat exchanger, one end of said fluid passage means being connected to the expansion tank and the other end being connected to the outlet connection from the primary engine block to the radiator, said pump directing fluid through the primary engine block, the auxiliary engine block and the heat exchanger in a closed path that shunts the radiator, for transferring heat from the auxiliary engine to the primary engine block, and means directing exhaust gases from the auxiliary engine through another passage of the heat exchanger.
Also in accordance with the invention there is provided a standby system for maintaining a liquid cooled primary engine in restarting condition at very low ambient temperatures after the primary engine is shut off, the primary engine being of a type having a liquid cooling system including a radiator connected to the primary engine for normally cooling a coolant liquid circulated through the engine block and the radiator, and an expansion tank into which the coolant drains, the standby system comprising:
an auxiliary engine having a liquid cooling system, a heat exchanger having at least two fluid passages therethrough for transferring heat from one fluid to another, fluid passage means including a pump, the auxiliary engine cooling system, and one passage of the heat exchanger, said fluid passage being 0~1 connected respectively to an inlet and an outlet of the mainengine cooling system, said pump directing fluid through the primary engine block, the auxiliary engine block and the heat exchanger in a closed path that shunts the radiator, for transferring heat from the auxiliary engine to the primary engine block, and means directing exhaust yases from the auxiliary engine through another passage of the heat exchanger.
The system may include thermostat means for sensing the temperature of the primary engine, and means responsive to the thermostat means for starting the auxiliary engine and said pump when the temperature of the primary engine drops below a predetermined level.
The system may f~rther include electrical generator means driven by the auxiliary engine independently of the primary engine, battery means for starting the primary engine, and means charging the battery means from the electrical generator means. The primary engine may include a lubricating oil circulating system, and means including a pump and valve mean~ for circulating lubricatiny oil through the circulating system of the primary engine, the pump being driven by the generator means.
Thus the present invention is directed to an improved arrangement for maintaining a liquid cooled engine, such as that of a diesel locomotive in condition for reliable restarting when not in use. The arranyement of the present invention requires no source of eneryy external to the locomotive, either in the ~ (.35 - 3a form of electrical power or a heated fluid to be connected to the locomotive engine. The present system provides a highly efficient use of the diesel fuel for keeping both the engine coolant and the engine lubricating oil sufficiently warm. It can also permit maintainance of the batteries at peak charge for a sustained period of time to enable easy restarting of the engine.
~ l..t7()521 1 srief Description of the Drawings For a better understanding of the invention, reference should be made to the accompanying drawings, wherein:
FIG. 1 is a schematic diagram of a preferred embodiment of the present invention;
FIG. 2 is a sectional view of the heat exchanger;
and FIG. 3 is a cross-sectional view of the heat exchanger-~1~7U5Z~
1 Detailed Description Referring to FIG. 1 in detail, the numeral 10 indicates generally an internal combustion engine such as the diesel engine of a railway locomotive~. However, it is to be understood that the invention is not limited to a diesel engine but may be applicable to any large internal combustion engine which needs to be started and operated under frigid conditions. Such engines normally include a liquid cooling system and a pressurized oil lubication system. When the engine is running, the liquid cooling system circulates the coolant through the engine block of the main engine and then passes the coolant through a radiator or other suitable heat exchanger 14 before returning the coolant to the engine.
An expansion tank 12 is provided to maintain adequate coolant and allow for expansion of the coolant with increased temperature. The cooling system is designed to maintain the engine temperature substantially constant over a wide range of ambient temperature conditions. The coolant may also be used to keep the lubricating oil cool, or the lubricating system may have its own radiator.
When the engine 10 is shut down, its temperature, along with the temperature of the coolant, and the lubricating oil, gradually cools down to the temperature of the surrounding air, which, under some conditions may be substantially below 0 F. At these temperatures, the lubricating oil does not function effectively and the resulting buildup of friction can impose very high torque loads on the starter motor. Also at these temperatures, the chemical action of the batteries slows down and they are not able to deliver the power 7o~l 1 necessary to turn the engine over. For this reason, even when a locomotive or other equipment is not in use, the engine is generally allowed to idle since restarting may be very problematical.
~he present invention provides a fuel saving solution to this problem. When the primary engine 10 is shut down, a thermostat 18 senses the drop in engine temperature.
When the temperature drops below a predetermined level, such as 120 F., the thermostat signals a control unit 20 which then energizes a starter 22 on an auxiliary engine 24 from the main battery pack 26 of the locomotive or other equipment driven by the primary engine 10. The auxiliary engine 24 preferably operates off the same fuel supply 28 as the primary engine 10. The control unit 20, in addition to activating the starter 22, turns on a valve 30 and pump 32 for pumping fuel from the fuel supply 28 to the auxiliary engine 24. The control unit 20 also activates an electric heater 34 which heats the fuel going to the auxiliary engine 24.
The auxiliary engine 24 drives an alternator or generator 36 which is connected by the control unit 20 to the main battery pack 26 to maintain a full charge in the batteries. At the same time the generator provides auxiliary electrical power to the electrical system of the locomotive.
Once the auxiliary engine 24 is started, it is also used to keep the coolant and lubricating oil of the primary engine 10 at or above a minimum temperature level which permits the primary engine 10 to be restarted without overloading the fully charged main battery pack 26.
117052~
1 To this end, the exhaust from the auxiliary en~ine 24 is directed through a heat exchanger 40. The heat exchanger 40, which is described in detail below in connection with FIGS. 2 and 3, is constructed with three fluid passages which are in heat exchanging relationship. The exhaust gases pass through a first passage 42. Engine coolant from the auxiliary engine 24 passes through a second passage 44 while lubricating oil from the primary engine 10 extends through a third passage 46.
The engine coolant passage 44 is part of a closed loop system in which coolant from the tank 12 is pumped through the primary engine 10 and radiator bypass 48 by a pump 50. The pump 50 discharges into the cooling system of the auxiliary engine 24 where it picks up heat from the auxiliary engine before passing through the passa~e 44 of the heat exchanger 40 back to the coolant tank 12 of the primary engine. The pump 50 and a valve 52 are activated by the control unit 20 after the auxiliary engine 24 is started.
Similarly the lubricating oil in the sump 16 is pumped through the passage 46 of the heat exchanger 40 through a valve 54 by a pump 56. The valve and pump are activated at the same time as the pump 50 and the valve 52. The lubricating oil, as it passes throu~h the heat exchanger 40, draws heat from the auxiliary engine exhaust and circulates the warm oil in the primary engine 10.
The auxiliary engine heating system can be disarmed by an ON/OFF switch 58 assGciated with the control unit - 20.
With the auxiliary engine 24 running, the circulating coolant picks up heat directly from the auxiliary engine 24 and also from the exhaust of the auxiliary --` 117()5Zl l engine by means o the heat exchanger 40. Thus the system takes full advantage of the thermal energy loss of the auxiliary engine, transferring the energy to the main engine. At the same time the mechanical energy of the auxiliary engine is used to drive the generator and store the energy in electrical form in the main battery pack 26. Excess thermal energy from the auxiliary engine 24 is also transferred to the lubricating oil, thus keeping the oil fluid and ready to flow through the engine to further reduce the starting load on the batteries. When the auxiliary engine is not running, the cooling system is isolated from the primary engine 10 and in no way interferes with the normal operation of the primary engine. It is also possible to use the radiator 14 in the cooling system of the auxiliary engine 24, if necessary, to maintain the temperature of the auxiliary engine 24 below the required operating limits.
Because the present invention provides a highly efficient transfer of energy from the auxiliary engine to the primary engine, the auxiliary engine may be quite small in relation to the primary engine. For example, it has been found that a single cylinder diesel engine-generator set consuming fuel at the rate of four pounds per hour is capable of generating 3.5 KW of electrical power and at the same time transferring approximately 50 KBTU/HR to the primary engine. This is sufficient heat to keep a 1500 horsepower diesel engine from dropping below 50 F. at an ambient temperature of -20 F; Moreover, at -20F. the primary engine takes approximately 10 hours to reach this temperature after it i5 shut down. Thus the present invention )S~l g 1 provides a highly efficient and effective way of maintaining the primary engine in restarting condition under adverse operating conditions.
The triaxial flow heat exchan~er 40 is shown in more detail in FIGS. 2 and 3. The heat exchanger includes a cylindrical outer wall or housing 70 which terminates at each end in headers 72 and 74. The headers support a plurality of tubes 76 which pass through holes in the headers and are welded or otherwise secured and sealed to the headers. ~xhaust gases from the auxiliary engine are directed through the tubes 76 through an input pipe 78 and a conical expander section 80 which is welded or otherwise secured to the header 72. A
reducer section 82 and outlet pipe 84 direct the exhaust gases to the atmosphere after they have passed through the heat exchanger tubes 76.
The space between the heat exchanger tubes 76 and the outer housing 70 is divided into two regions by a series of metal divider strips 86, which lie in a common vertical plane extending along the axis of the housing 70. The divifler strips are welded or otherwise secured in the spaces between the tubes and the housing, as best shown in FI~,. 3. The divider strips extend lengthwise of the housing from the header 72 for a distance slightly less than the length of the tubes, thereby leaving openings, such as indicated at 88, between the header 74 and the ends of the divider strips.
Coolant from the auxiliary engine 24 is directed into the housing of the heat exchanger through an input pipe connection 90 adjacent the header 72. The coolant 10ws lengthwise of the tubes on one side of the divider strips 86 toward the header 74 where it passes through the opcnings 88. The coolant then flows back 1~7~5'~
1 through the housing toward the header 72 and is discharged through an outlet pipe 92 adjacent the header 72. Thus the engine coolant from the auxiliary engine picks up additional heat from the engine exhaust as it passes throu~h the heat exhanager tubes 76.
In addition, a cylindrical jacket 94 surrounds the cylindrical housing 70. The jacket 94 terminates against the header 74 at one end and is welded or otherwise secured in sealed relation to the header 74. The other end of the cylindrical jacket 94 terminates in a flange 96 extending around the outside of the housing 70. The jacket 94, the outside of the housing 70, the header 74 and the flange 96 thus form an annular space surrounding the outside of the heat exchanger. This annular space is divided into an upper and lower region by a pair of divider strips 98 which extend from the header 74 at one end and terminate short of the flange 96 to leave openings between the upper and lower regions of the annular space. Lubricating oil from the primary engine is pumped through the annular spacè within the jacket 94 through an input pipe connection 100, and the heated oil is returned to the primary engine through an output pipe connection 102.` The lubricating oil picks up heat from the heated coolant circulating in the space within the cylindrical housing 70. The coolant protects the lubricating oil from overheating due to direct contact with the heat exchanger tube 76 through which the hot exhaust gases are directed.
RESTARTING CO~DITION
Field of the In~ention This invention relates to a standby system for main-taining a liquid cooled primary engine such as a large diesel engine in restarting condition under low ambient temperature conditions.
Bac~ground of the Invention Large diesel engines such as used in railroad locomotives, heavy earth-moving equipment and the like, can be difficult to start, particularly at low operating temperatures. Starting the diesel engines requires a large amount of electrical energy. The only source of electrical energy may be a bank of batteries whose ability to produce large amounts of energy is also adversely affected by low ambient temperature operating conditions. If the energy from the batteries is insufficient for starting, auxiliary power must be available. For these and other reasons, it is the practice to leave the engine running when not in use, particularly where the locomotive is in a yard or siding and auxiliary power is not readily available.
However, a locomotive may burn in the order of 6 to 8 gallons per hour, resulting in a substantial wasted fuel cost when measured in terms of the number of hours of locomotive non-use.
Various systems have heretofore been proposed to maintain an engine heated even though it has been shut down.
. .. .
S~l ~ - 2 For example, U.S. Patent Nos. 4,245,593 and 4, 249,491 show an arrangement for using an electric heater for preheating both the lubricating oil and the coolant of an engine to make it easier to start. Such an arrangement, however, required access to a source of electrical power, which may not always be available.
Using the heat from another enyine has also been proposed by providing a temporary connection between the two liquid cooling systems for transferring heat from one engine to another. See, for example, ~.S. Patent Nos. 3,373,728 and 4,051,825. Problems arise with such arrangements, including the possibility that the engine will be started and driven off with the heated water systems still attached. Trade union restrictions may also require special personnel to make the necessary interconnection. It also requires that another engine equipped with suitable connection attachments be available.
Summary of the Invention In accordance with the present invention there is provided a standby system for maintaining a liquid cooled primary engine in restarting condition at very low ambient temperatures after the primary engine is shut off, the primary engine being of a type having a liquid cooling system includiny a radiator connected to the primary engine for normally cooling a coolant liquid circulated through the engine block and the radiator, and an expansion tank into which the coolant drains, the standby system comprising:
~ 7(~S~
- 2a an auxiliary engine having a liquid cooling system, a heat exchanger having at least two fluid passages therethrough for transferring heat from one fluid to another, fluid passage means including a pump, the auxiliary engine cooling system, and one passage of the heat exchanger, one end of said fluid passage means being connected to the expansion tank and the other end being connected to the outlet connection from the primary engine block to the radiator, said pump directing fluid through the primary engine block, the auxiliary engine block and the heat exchanger in a closed path that shunts the radiator, for transferring heat from the auxiliary engine to the primary engine block, and means directing exhaust gases from the auxiliary engine through another passage of the heat exchanger.
Also in accordance with the invention there is provided a standby system for maintaining a liquid cooled primary engine in restarting condition at very low ambient temperatures after the primary engine is shut off, the primary engine being of a type having a liquid cooling system including a radiator connected to the primary engine for normally cooling a coolant liquid circulated through the engine block and the radiator, and an expansion tank into which the coolant drains, the standby system comprising:
an auxiliary engine having a liquid cooling system, a heat exchanger having at least two fluid passages therethrough for transferring heat from one fluid to another, fluid passage means including a pump, the auxiliary engine cooling system, and one passage of the heat exchanger, said fluid passage being 0~1 connected respectively to an inlet and an outlet of the mainengine cooling system, said pump directing fluid through the primary engine block, the auxiliary engine block and the heat exchanger in a closed path that shunts the radiator, for transferring heat from the auxiliary engine to the primary engine block, and means directing exhaust yases from the auxiliary engine through another passage of the heat exchanger.
The system may include thermostat means for sensing the temperature of the primary engine, and means responsive to the thermostat means for starting the auxiliary engine and said pump when the temperature of the primary engine drops below a predetermined level.
The system may f~rther include electrical generator means driven by the auxiliary engine independently of the primary engine, battery means for starting the primary engine, and means charging the battery means from the electrical generator means. The primary engine may include a lubricating oil circulating system, and means including a pump and valve mean~ for circulating lubricatiny oil through the circulating system of the primary engine, the pump being driven by the generator means.
Thus the present invention is directed to an improved arrangement for maintaining a liquid cooled engine, such as that of a diesel locomotive in condition for reliable restarting when not in use. The arranyement of the present invention requires no source of eneryy external to the locomotive, either in the ~ (.35 - 3a form of electrical power or a heated fluid to be connected to the locomotive engine. The present system provides a highly efficient use of the diesel fuel for keeping both the engine coolant and the engine lubricating oil sufficiently warm. It can also permit maintainance of the batteries at peak charge for a sustained period of time to enable easy restarting of the engine.
~ l..t7()521 1 srief Description of the Drawings For a better understanding of the invention, reference should be made to the accompanying drawings, wherein:
FIG. 1 is a schematic diagram of a preferred embodiment of the present invention;
FIG. 2 is a sectional view of the heat exchanger;
and FIG. 3 is a cross-sectional view of the heat exchanger-~1~7U5Z~
1 Detailed Description Referring to FIG. 1 in detail, the numeral 10 indicates generally an internal combustion engine such as the diesel engine of a railway locomotive~. However, it is to be understood that the invention is not limited to a diesel engine but may be applicable to any large internal combustion engine which needs to be started and operated under frigid conditions. Such engines normally include a liquid cooling system and a pressurized oil lubication system. When the engine is running, the liquid cooling system circulates the coolant through the engine block of the main engine and then passes the coolant through a radiator or other suitable heat exchanger 14 before returning the coolant to the engine.
An expansion tank 12 is provided to maintain adequate coolant and allow for expansion of the coolant with increased temperature. The cooling system is designed to maintain the engine temperature substantially constant over a wide range of ambient temperature conditions. The coolant may also be used to keep the lubricating oil cool, or the lubricating system may have its own radiator.
When the engine 10 is shut down, its temperature, along with the temperature of the coolant, and the lubricating oil, gradually cools down to the temperature of the surrounding air, which, under some conditions may be substantially below 0 F. At these temperatures, the lubricating oil does not function effectively and the resulting buildup of friction can impose very high torque loads on the starter motor. Also at these temperatures, the chemical action of the batteries slows down and they are not able to deliver the power 7o~l 1 necessary to turn the engine over. For this reason, even when a locomotive or other equipment is not in use, the engine is generally allowed to idle since restarting may be very problematical.
~he present invention provides a fuel saving solution to this problem. When the primary engine 10 is shut down, a thermostat 18 senses the drop in engine temperature.
When the temperature drops below a predetermined level, such as 120 F., the thermostat signals a control unit 20 which then energizes a starter 22 on an auxiliary engine 24 from the main battery pack 26 of the locomotive or other equipment driven by the primary engine 10. The auxiliary engine 24 preferably operates off the same fuel supply 28 as the primary engine 10. The control unit 20, in addition to activating the starter 22, turns on a valve 30 and pump 32 for pumping fuel from the fuel supply 28 to the auxiliary engine 24. The control unit 20 also activates an electric heater 34 which heats the fuel going to the auxiliary engine 24.
The auxiliary engine 24 drives an alternator or generator 36 which is connected by the control unit 20 to the main battery pack 26 to maintain a full charge in the batteries. At the same time the generator provides auxiliary electrical power to the electrical system of the locomotive.
Once the auxiliary engine 24 is started, it is also used to keep the coolant and lubricating oil of the primary engine 10 at or above a minimum temperature level which permits the primary engine 10 to be restarted without overloading the fully charged main battery pack 26.
117052~
1 To this end, the exhaust from the auxiliary en~ine 24 is directed through a heat exchanger 40. The heat exchanger 40, which is described in detail below in connection with FIGS. 2 and 3, is constructed with three fluid passages which are in heat exchanging relationship. The exhaust gases pass through a first passage 42. Engine coolant from the auxiliary engine 24 passes through a second passage 44 while lubricating oil from the primary engine 10 extends through a third passage 46.
The engine coolant passage 44 is part of a closed loop system in which coolant from the tank 12 is pumped through the primary engine 10 and radiator bypass 48 by a pump 50. The pump 50 discharges into the cooling system of the auxiliary engine 24 where it picks up heat from the auxiliary engine before passing through the passa~e 44 of the heat exchanger 40 back to the coolant tank 12 of the primary engine. The pump 50 and a valve 52 are activated by the control unit 20 after the auxiliary engine 24 is started.
Similarly the lubricating oil in the sump 16 is pumped through the passage 46 of the heat exchanger 40 through a valve 54 by a pump 56. The valve and pump are activated at the same time as the pump 50 and the valve 52. The lubricating oil, as it passes throu~h the heat exchanger 40, draws heat from the auxiliary engine exhaust and circulates the warm oil in the primary engine 10.
The auxiliary engine heating system can be disarmed by an ON/OFF switch 58 assGciated with the control unit - 20.
With the auxiliary engine 24 running, the circulating coolant picks up heat directly from the auxiliary engine 24 and also from the exhaust of the auxiliary --` 117()5Zl l engine by means o the heat exchanger 40. Thus the system takes full advantage of the thermal energy loss of the auxiliary engine, transferring the energy to the main engine. At the same time the mechanical energy of the auxiliary engine is used to drive the generator and store the energy in electrical form in the main battery pack 26. Excess thermal energy from the auxiliary engine 24 is also transferred to the lubricating oil, thus keeping the oil fluid and ready to flow through the engine to further reduce the starting load on the batteries. When the auxiliary engine is not running, the cooling system is isolated from the primary engine 10 and in no way interferes with the normal operation of the primary engine. It is also possible to use the radiator 14 in the cooling system of the auxiliary engine 24, if necessary, to maintain the temperature of the auxiliary engine 24 below the required operating limits.
Because the present invention provides a highly efficient transfer of energy from the auxiliary engine to the primary engine, the auxiliary engine may be quite small in relation to the primary engine. For example, it has been found that a single cylinder diesel engine-generator set consuming fuel at the rate of four pounds per hour is capable of generating 3.5 KW of electrical power and at the same time transferring approximately 50 KBTU/HR to the primary engine. This is sufficient heat to keep a 1500 horsepower diesel engine from dropping below 50 F. at an ambient temperature of -20 F; Moreover, at -20F. the primary engine takes approximately 10 hours to reach this temperature after it i5 shut down. Thus the present invention )S~l g 1 provides a highly efficient and effective way of maintaining the primary engine in restarting condition under adverse operating conditions.
The triaxial flow heat exchan~er 40 is shown in more detail in FIGS. 2 and 3. The heat exchanger includes a cylindrical outer wall or housing 70 which terminates at each end in headers 72 and 74. The headers support a plurality of tubes 76 which pass through holes in the headers and are welded or otherwise secured and sealed to the headers. ~xhaust gases from the auxiliary engine are directed through the tubes 76 through an input pipe 78 and a conical expander section 80 which is welded or otherwise secured to the header 72. A
reducer section 82 and outlet pipe 84 direct the exhaust gases to the atmosphere after they have passed through the heat exchanger tubes 76.
The space between the heat exchanger tubes 76 and the outer housing 70 is divided into two regions by a series of metal divider strips 86, which lie in a common vertical plane extending along the axis of the housing 70. The divifler strips are welded or otherwise secured in the spaces between the tubes and the housing, as best shown in FI~,. 3. The divider strips extend lengthwise of the housing from the header 72 for a distance slightly less than the length of the tubes, thereby leaving openings, such as indicated at 88, between the header 74 and the ends of the divider strips.
Coolant from the auxiliary engine 24 is directed into the housing of the heat exchanger through an input pipe connection 90 adjacent the header 72. The coolant 10ws lengthwise of the tubes on one side of the divider strips 86 toward the header 74 where it passes through the opcnings 88. The coolant then flows back 1~7~5'~
1 through the housing toward the header 72 and is discharged through an outlet pipe 92 adjacent the header 72. Thus the engine coolant from the auxiliary engine picks up additional heat from the engine exhaust as it passes throu~h the heat exhanager tubes 76.
In addition, a cylindrical jacket 94 surrounds the cylindrical housing 70. The jacket 94 terminates against the header 74 at one end and is welded or otherwise secured in sealed relation to the header 74. The other end of the cylindrical jacket 94 terminates in a flange 96 extending around the outside of the housing 70. The jacket 94, the outside of the housing 70, the header 74 and the flange 96 thus form an annular space surrounding the outside of the heat exchanger. This annular space is divided into an upper and lower region by a pair of divider strips 98 which extend from the header 74 at one end and terminate short of the flange 96 to leave openings between the upper and lower regions of the annular space. Lubricating oil from the primary engine is pumped through the annular spacè within the jacket 94 through an input pipe connection 100, and the heated oil is returned to the primary engine through an output pipe connection 102.` The lubricating oil picks up heat from the heated coolant circulating in the space within the cylindrical housing 70. The coolant protects the lubricating oil from overheating due to direct contact with the heat exchanger tube 76 through which the hot exhaust gases are directed.
Claims (5)
1. A standby system for maintaining a liquid cooled primary engine in restarting condition at very low ambient temperatures after the primary engine is shut off, the primary engine being of a type having a liquid cooling system including a radiator connected to the primary engine for normally cooling a coolant liquid circulated through the engine block and the radiator, and an expansion tank into which the coolant drains, the standby system comprising:
an auxiliary engine having a liquid cooling system, a heat exchanger having at least two fluid passages therethrough for transferring heat from one fluid to another, fluid passage means including a pump, the auxiliary engine cooling system, and one passage of the heat exchanger, one end of said fluid passage means being connected to the expansion tank and the other end being connected to the outlet connection from the primary engine block to the radiator, said pump directing fluid through the primary engine block, the auxiliary engine block and the heat exchanger in a closed path that shunts the radiator, for transferring heat from the auxiliary engine to the primary engine block, and means directing exhaust gases from the auxiliary engine through another passage of the heat exchanger.
an auxiliary engine having a liquid cooling system, a heat exchanger having at least two fluid passages therethrough for transferring heat from one fluid to another, fluid passage means including a pump, the auxiliary engine cooling system, and one passage of the heat exchanger, one end of said fluid passage means being connected to the expansion tank and the other end being connected to the outlet connection from the primary engine block to the radiator, said pump directing fluid through the primary engine block, the auxiliary engine block and the heat exchanger in a closed path that shunts the radiator, for transferring heat from the auxiliary engine to the primary engine block, and means directing exhaust gases from the auxiliary engine through another passage of the heat exchanger.
2. A standby system for maintaining a liquid cooled primary engine in restarting condition at very low ambient temperatures after the primary engine is shut off, the primary engine being of a type having a liquid cooling system including a radiator connected to the primary engine for normally cooling a coolant liquid circulated through the engine block and the radiator, and an expansion tank into which the coolant drains, the standby system comprising:
an auxiliary engine having a liquid cooling system, a heat exchanger having at least two fluid passages therethrough for transferring heat from one fluid to another, fluid passage means including a pump, the auxiliary engine cooling system, and one passage of the heat exchanger, said fluid passage being connected respectively to an inlet and an outlet of the main engine cooling system, said pump directing fluid through the primary engine block, the auxiliary engine block and the heat exchanger in a closed path that shunts the radiator, for transferring heat from the auxiliary engine to the primary engine block, and means directing exhaust gases from the auxiliary engine through another passage of the heat exchanger.
an auxiliary engine having a liquid cooling system, a heat exchanger having at least two fluid passages therethrough for transferring heat from one fluid to another, fluid passage means including a pump, the auxiliary engine cooling system, and one passage of the heat exchanger, said fluid passage being connected respectively to an inlet and an outlet of the main engine cooling system, said pump directing fluid through the primary engine block, the auxiliary engine block and the heat exchanger in a closed path that shunts the radiator, for transferring heat from the auxiliary engine to the primary engine block, and means directing exhaust gases from the auxiliary engine through another passage of the heat exchanger.
3. Apparatus of claim 1 or 2 further including thermostat means for sensing the temperature of the primary engine, and means responsive to the thermostat means for starting the auxiliary engine and said pump when the temperature of the primary engine drops below a predetermined level.
4. Apparatus of claim 1 or 2 further including electrical generator means driven by the auxiliary engine independently of the primary engine, battery means for starting the primary engine, and means charging the battery means from the electrical generator means.
5. Apparatus of claim 1 or 2 further including electrical generator means driven by the auxiliary engine independently of the primary engine, battery means for starting the primary engine, and means charging the battery means from the electrical generator means, wherein the primary engine includes a lubricating oil circulating system, and means including a pump and valve means for circulating lubricating oil through the circulating system of the primary engine, the pump being driven by the generator means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US319,113 | 1981-11-09 | ||
| US06/319,113 US4424775A (en) | 1981-11-09 | 1981-11-09 | Apparatus for maintaining a diesel engine in restarting condition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1170521A true CA1170521A (en) | 1984-07-10 |
Family
ID=23240907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000414510A Expired CA1170521A (en) | 1981-11-09 | 1982-10-29 | Apparatus for maintaining a diesel engine in restarting condition |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4424775A (en) |
| EP (1) | EP0079500A1 (en) |
| CA (1) | CA1170521A (en) |
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| US4711204A (en) * | 1983-08-08 | 1987-12-08 | Rusconi David M | Apparatus and method for cold weather protection of large diesel engines |
| US4531379A (en) * | 1983-10-14 | 1985-07-30 | Diefenthaler Jr Robert E | Auxiliary power system for vehicle air conditioner and heater |
| US4532894A (en) * | 1984-03-30 | 1985-08-06 | Daimler-Benz Aktiengesellschaft | Heating arrangement for electrically driven vehicles |
| USRE33687E (en) * | 1986-06-02 | 1991-09-10 | Pony Pack, Inc. | Auxiliary air conditioning, heating and engine warming system for trucks |
| US4682649A (en) * | 1986-06-02 | 1987-07-28 | Greer J Rex | Auxiliary air conditioning, heating and engine warming system for trucks |
| US5205250A (en) * | 1991-12-06 | 1993-04-27 | Herbert Easterly | Fuel preheating system |
| US5333678A (en) * | 1992-03-06 | 1994-08-02 | Onan Corporation | Auxiliary power unit |
| US5255733A (en) * | 1992-08-10 | 1993-10-26 | Ford Motor Company | Hybird vehicle cooling system |
| CA2185076A1 (en) * | 1996-09-09 | 1998-03-10 | Easton Bennett | Heat exchanger for a hydrocarbon fuelled motor vehicle |
| US6151891A (en) * | 1998-09-22 | 2000-11-28 | Bennett; Easton | Heat exchanger for a motor vehicle exhaust |
| DE10006077A1 (en) * | 2000-02-11 | 2001-08-30 | Rheinmetall Landsysteme Gmbh | Energy generation device for wheeled and tracked vehicles for use in arctic climatic zones has small auxiliary energy generator in form of gas turbine producing hot air with compressor |
| ATE422611T1 (en) * | 2000-11-17 | 2009-02-15 | Csxt Intellectual Properties C | SYSTEM AND METHOD FOR SUPPLYING A LARGE DIESEL ENGINE WITH AUXILIARY POWER |
| US6470844B2 (en) * | 2001-01-31 | 2002-10-29 | Csx Transportation, Inc. | System and method for supplying auxiliary power to a large diesel engine |
| US6636798B2 (en) | 2001-01-31 | 2003-10-21 | Csxt Intellectual Properties Corporation | Locomotive emission reduction kit and method of earning emission credits |
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| US7481187B2 (en) * | 2001-01-31 | 2009-01-27 | Csxt Intellectual Properties Corporation | System and method for supplying auxiliary power to a large diesel engine |
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| US20070170271A1 (en) * | 2006-01-12 | 2007-07-26 | Fred Millard | Auxiliary power unit heating system |
| US20070289325A1 (en) * | 2006-06-14 | 2007-12-20 | Tyler Stone | Dc to ac auxiliary power unit |
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| CN101514666B (en) * | 2009-03-09 | 2010-10-27 | 盐城兴动机械有限公司 | Device and method for warming up a large automobile engine |
| US20110114405A1 (en) * | 2009-11-17 | 2011-05-19 | Perhats Frank J | Drive isolation system for traction engine driven accessories |
| US20120013132A1 (en) * | 2010-05-18 | 2012-01-19 | Spartan Motors, Inc. | Low emissions hybrid vehicle |
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| US8893841B2 (en) * | 2011-11-14 | 2014-11-25 | Illinois Tool Works Inc. | Systems and methods for integrating work vehicle and service pack cooling systems |
| US8596201B2 (en) * | 2011-12-15 | 2013-12-03 | Progress Rail Services Corp | Engine warming system for a multi-engine machine |
| US20130152818A1 (en) * | 2011-12-15 | 2013-06-20 | Matthew G. HOLL | Fuel heating system for a multi-engine machine |
| CN102979614A (en) * | 2012-11-16 | 2013-03-20 | 宁夏送变电工程公司 | Preheating device of tension and tractive equipment |
| DE102013207047B3 (en) * | 2013-04-18 | 2014-08-14 | Bombardier Transportation Gmbh | Operating an arrangement with a plurality of internal combustion engines and electrical machines for supplying a rail vehicle with electrical energy |
| JP6346426B2 (en) * | 2013-08-12 | 2018-06-20 | 現代自動車株式会社Ｈｙｕｎｄａｉ Ｍｏｔｏｒ Ｃｏｍｐａｎｙ | EGR gas and engine oil cooling device and control method thereof |
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| CN106286069A (en) * | 2016-09-14 | 2017-01-04 | 北京理工大学 | Tremble with fear district's pre-heating system in engineering truck subsidiary engine power station |
| GB2572986B (en) * | 2018-04-18 | 2021-01-20 | Caterpillar Inc | Combined engine systems |
| CN113669185B (en) * | 2021-06-28 | 2022-08-05 | 沪东中华造船(集团)有限公司 | Multi-channel fresh water mutual preheating heating system and method for marine diesel engine and diesel generator |
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| FR903372A (en) * | 1943-01-25 | 1945-10-01 | Messerschmitt Boelkow Blohm | Method for starting a hydraulically cooled internal combustion engine |
| DE965002C (en) * | 1953-02-19 | 1957-05-29 | Heinrich Christiansen Dipl Ing | Device for starting up an internal combustion engine by means of an auxiliary motor |
| US2905163A (en) * | 1954-02-16 | 1959-09-22 | Rockwell Gmbh | Method of and arrangement for starting an internal combustion engine |
| FR1395773A (en) * | 1964-03-05 | 1965-04-16 | Heating method and device for thermal machines | |
| US4258677A (en) * | 1979-03-29 | 1981-03-31 | Sanders Nicholas A | Engine heating device |
-
1981
- 1981-11-09 US US06/319,113 patent/US4424775A/en not_active Expired - Fee Related
-
1982
- 1982-10-27 EP EP82109944A patent/EP0079500A1/en not_active Withdrawn
- 1982-10-29 CA CA000414510A patent/CA1170521A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0079500A1 (en) | 1983-05-25 |
| US4424775A (en) | 1984-01-10 |
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