CN102269030A - Oil-gas separator and crankcase blow-by amount detection control system with same - Google Patents

Oil-gas separator and crankcase blow-by amount detection control system with same Download PDF

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Publication number
CN102269030A
CN102269030A CN201110171381A CN201110171381A CN102269030A CN 102269030 A CN102269030 A CN 102269030A CN 201110171381 A CN201110171381 A CN 201110171381A CN 201110171381 A CN201110171381 A CN 201110171381A CN 102269030 A CN102269030 A CN 102269030A
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outlet pipe
gas
steam outlet
control unit
throttling
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赵联海
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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Abstract

The invention discloses an oil-gas separator. In the oil-gas separator, an air outlet pipe is provided with a throttling reducer section; and a first pressure sensor and a second pressure sensor are arranged on the air outlet pipe and are used for acquiring pressure generated before and after throttling in the air outlet pipe respectively. A crankcase blow-by amount detection control system using the oil-gas separator also comprises a control unit, wherein the control unit is used for outputting a blow-by amount status detection signal in real time according to pressure signals acquired by the first and second pressure sensors on the oil-gas separator and a preset gas density threshold value. The oil-gas separator and the system have the characteristics of operating reliably, along with simple structures and high practicability; and based on the blow-by amount status detection signal which is output in real time, a user can acquire warnings and timely detect an engine according to the signal, so that the problems of reduction in the power of the engine, increase of fuel consumption, high aging speed of engine oil and the like can be effectively solved, and the influences of the blow-by of a crankcase on the environment can be reduced.

Description

Deaerator and the crankcase gas leakage with this separator detect control system
Technical field
The present invention relates to engine fittings and control technique thereof, be specifically related to a kind of deaerator and have the crankcase gas leakage detection control system of this separator.
Background technique
Present engine operation all is to light work done generation power then by compression after sucking mixed air.As everyone knows, motor in the course of the work, the pressure of explosion of its expansion space stroke can be up to 18～20Mpa.Under the effect of above-mentioned high pressure, seal although be provided with piston ring between piston and the cylinder body, compressed mixed gas cognition is scurried out from the places such as slit of slit, gap-clearance of piston rings, piston ring and the cylinder body of piston and cylinder body and is entered crankcase.
Meanwhile, along with moving up and down of piston, in crankcase, will produce certain back pressure.Therefore, exceed the rating value of producer regulation when air leakage after, must cause the power of motor to descend, fuel consumption rate increases, the appearance of the aging problem such as fast of machine oil, has influenced the motor usability on the one hand, has increased its user cost on the other hand greatly.
In addition, because the oil return of engine supercharger need be back to crankcase, therefore, increasing of crankcase pressure also can make the pressurized machine oil return not smooth, and then causes the pressurized machine leakage of oil.
In addition, the pollution of atmosphere that the crankcase gas blowby also can cause is unfavorable for environmental protection.
Based on the existing above-mentioned defective of crankcase gas blowby, prior art has proposed series of solutions at the ventilation and the related Oil-gas Separation problem of ventilation process of crankcase, and its working principle is to handle with unnecessary waste gas discharge crankcase or to the waste gas of discharging.Obviously, prior art only is to have solved a series of defectives that gas blowby caused, and does not fundamentally solve the root that produces gas blowby.That is to say, if motor is work so for a long time, the basic reason that forms gas blowby will be serious gradually, such as, the excessive wear of piston ring, cylinder sleeve appears or sticking of piston rings is stuck or phenomenon such as fracture, thereby make engine performance further worsen, cause the power character of motor, economical, reliability decrease.
In view of this, demand urgently being optimized design,, effectively stablize engine performance to avoid the occurring excessive wear of piston ring, cylinder sleeve or sticking of piston rings is stuck or phenomenon such as fracture at prior art.
Summary of the invention
At above-mentioned defective, the technical problem that the present invention solves is to provide a kind of deaerator, to possess the function that provides gas parameter in the tracheae, provides reliable guarantee for stablizing engine performance.On this basis, the present invention also provides a kind of crankcase gas leakage of this deaerator of application to detect control system.
Deaerator provided by the invention is provided with the deaerator core in its housing, described housing is provided with inlet tube, steam outlet pipe and the return tube that is communicated with medial compartment; Described steam outlet pipe has the throttling reducer; Described steam outlet pipe is provided with first pressure transducer and second pressure transducer, gathers the forward and backward pressure of throttling in the described steam outlet pipe respectively.
Preferably, the radially outstanding throttling reducer that forms cross section gradual change shape of the inwall of described steam outlet pipe, and offer the radially through hole that is connected with described second pressure transducer on the described steam outlet pipe of minimum passage section position, offer the radially through hole that is connected with described first pressure transducer on the described steam outlet pipe of described throttling reducer upstream side.
Crankcase gas leakage provided by the invention detects control system, comprises foregoing deaerator and control unit; Wherein, the pressure signal that described control unit is gathered according to first, second pressure transducer on the described deaerator, and default gas density threshold value are exported the state detection signal of air leak amount in real time.
Preferably, described control unit is specially engine electronic control unit.
Preferably, described engine electronic control unit calculates volumetric flow of gas qv according to following formula, and exports the display unit demonstration to;
q V = A 2 1 - ( A 2 A 1 ) 2 2 ( p 1 - p 2 ) ρ , In the formula:
A 1The passage section area of the described steam outlet pipe of-default throttling reducer upstream side;
A 2The minimum passage section area of-default described steam outlet pipe;
p 1The pressure signal that-the first pressure transducer is gathered;
p 2The pressure signal that-the second pressure transducer is gathered;
Gas density in ρ-described steam outlet pipe.
Preferably, described engine electronic control unit calculates volumetric flow of gas q according to following formula v, and export the display unit demonstration to;
q V = αϵa 2 Δp ρ , In the formula:
The minimum passage section area of the described steam outlet pipe that a-is default;
Gas density in ρ-described steam outlet pipe;
Pressure reduction before and after the Δ p-throttling, i.e. p 1-p 2
The E of ε-described steam outlet pipe;
The flow coefficient of α-described steam outlet pipe.
Preferably, described engine electronic control unit is Rule of judgment with described volumetric flow of gas more than or equal to the first volumetric flow of gas threshold value, obtains to exist the failure judgment result; Have fault if judged result characterizes, then output alarm signal is to display unit.
Preferably, described engine electronic control unit is Rule of judgment with described volumetric flow of gas greater than the second volumetric flow of gas threshold value, obtains to start the judged result of extraction flow error diagnosis management.
Preferably, described volumetric flow of gas is specially mean value.
Preferably, need to start extraction flow error diagnosis management, then export control signal limiting engine output torque if judged result characterizes.
Deaerator provided by the invention has carried out optimal design on the basis of existing technology, and its steam outlet pipe has throttling function, and gathers the forward and backward gas pressure of steam outlet pipe throttling respectively by first pressure transducer and second pressure transducer.Compared with prior art, the described deaerator of this programme possesses the function that provides gas parameter in the tracheae, provides reliable guarantee for stablizing engine performance.
As a kind of concrete application of this deaerator, crankcase gas leakage provided by the invention detects control system and also comprises control unit; The pressure signal that its control unit can be gathered according to first, second pressure transducer on the deaerator, and default gas density threshold value are exported the state detection signal of air leak amount in real time, thereby can fundamentally be solved the root that produces gas blowby.
That the present invention has is simple in structure, reliable operation, practical characteristics, can guarantee certain measuring accuracy surely without real failing to be sold at auction.In the practical work process, detect the control system state detection signal of the air leak amount of output in real time based on this crankcase gas leakage, the user can remind also according to this information acquisition and in time motor be checked, change corresponding component in case of necessity, problems such as it is fast that thereby the power that can effectively avoid motor descends, fuel consumption rate increases, machine oil wears out reduce user's maintenance cost.Simultaneously, can effectively avoid because crankcase pressure increases the fault of the pressurized machine leakage of oil that the oil return of the pressurized machine that causes freely do not cause etc., and significantly reduce because the influence that the crankcase gas blowby causes for environment.
Description of drawings
Fig. 1 is the overall structure schematic representation of deaerator described in the embodiment;
Fig. 2 is the left view of Fig. 1;
Fig. 3 is the unit block diagram that crankcase gas leakage described in the embodiment detects control system;
Fig. 4 is the control flow chart of control unit described in the embodiment.
Among the figure:
Inlet tube 1, first pressure transducer 2, second pressure transducer 3, steam outlet pipe 4, return tube 5, deaerator 10, display unit 20, control unit 30.
Embodiment
Core of the present invention provides a kind of deaerator, to possess the function that provides gas parameter in the tracheae, provides reliable guarantee for stablizing engine performance.Specify present embodiment below in conjunction with Figure of description.
See also Fig. 1 and Fig. 2, wherein, Fig. 1 is the overall structure schematic representation of the described deaerator of present embodiment, and Fig. 2 is the left view of Fig. 1.
As shown in the figure, be provided with the deaerator core in the housing of this deaerator, the working principle of its separation oil and gas is same as the prior art, is provided with the inlet tube 1, steam outlet pipe 4 and the return tube 5 that are communicated with medial compartment on housing equally; During use, the medial compartment that the waste gas in the crankcase enters deaerator through suction tude 1, after the deaerator core was handled, the machine oil in the waste gas was separated and is reclaimed after return tube 5 flows out, and gas is discharged from steam outlet pipe 4.Need to prove that the main body of this deaerator constitutes same as the prior art, those of ordinary skill in the art can realize fully based on prior art, so this paper repeats no more.
As previously mentioned, deaerator of the present invention possesses the function that provides gas parameter in the tracheae, and as shown in Figure 1, this steam outlet pipe 4 has the throttling reducer, so that air-flow forms different flow velocitys and pressure in the steam outlet pipe 4.Simultaneously, steam outlet pipe 4 is provided with first pressure transducer 2 and second pressure transducer 3, and wherein, first pressure transducer 2 is used to gather the pressure before the throttling in the steam outlet pipe 4, and second pressure transducer 3 is used to gather the pressure after the throttling in the steam outlet pipe 4.
The formation that should be appreciated that this throttling reducer can adopt multiple structure to realize, uses needs all can as long as satisfy.As shown in Figure 1, the radially outstanding throttling reducer that forms cross section gradual change shape of the inwall of this steam outlet pipe 4, and offer the radially through hole that is connected with described second pressure transducer 3 on the steam outlet pipe 4 of minimum passage section position, offer the radially through hole that is connected with first pressure transducer 2 on the steam outlet pipe 4 of this throttling reducer upstream side.So be provided with, can obtain the forward and backward gas pressure value of throttling accurately, detect control system to be applied to crankcase gas leakage provided by the present invention.
See also Fig. 3, the figure shows the unit block diagram that the described crankcase gas leakage of present embodiment detects control system.
This system comprises foregoing deaerator 10 and control unit 30.Wherein, the pressure signal that control unit 30 is gathered according to first, second pressure transducer on the deaerator 10, and default gas density threshold value are exported the state detection signal of air leak amount in real time.Certainly, gas density also can adopt the gas density obtaining device to obtain, and it can be arranged on the upstream side or the downstream side of steam outlet pipe 4, and obviously, it is provided with the position for adopting precision not constitute materially affect.
The control unit 30 of this programme is specially engine electronic control unit ECU.In fact, this control unit 30 also can adopt the independent programmable controller that is provided with, but considers from the angle that complete machine is optimized, and effectively utilizes the electronic control unit ECU of motor self to be optimal case.
The computational methods of the volume flowrate qv of following brief description gas blowby.
At first, can calculate flow value, when gas stream is crossed the pipeline that has throttling, concern below the equation of continuity existence according to fluid based on the differential pressure measurement value:
A 1v 1=A 2v 2=q V, in the formula:
A 1The passage section area of the described steam outlet pipe of-throttling reducer upstream side defaults in the storage of control unit;
A 2The minimum passage section area of-described steam outlet pipe defaults in the storage of control unit;
v 1Gas flow rate in the described steam outlet pipe of-throttling reducer upstream side;
v 2The gas flow rate of-throttling reducer;
q v-volumetric flow of gas.
Again, according to the law of conservation of energy of fluid as can be known, the kinetic energy of each point, potential energy and pressure can summation remain unchanged on the fluid flow line.Be expressed as with Bernoulli's equation:
gZ 1 + 1 2 v 1 2 + p 1 ρ = gZ 2 + 1 2 v 2 2 + p 2 ρ , In the formula:
p 1The pressure signal that-the first pressure transducer is gathered;
p 2The pressure signal that-the second pressure transducer is gathered;
Z 1, Z 2_ represent that respectively the height coordinate of each pipeline section center, ρ are the density of fluid.So, suppose that pipeline is a horizontal positioned, Z 1=Z 2, then
1 2 v 1 2 + p 1 ρ = 1 2 v 2 2 + p 2 ρ , Because v 1＜v 2, p as can be known 1＞p 2
Can determine thus, q V = A 2 1 - ( A 2 A 1 ) 2 2 ( p 1 - p 2 ) ρ .
According to above-mentioned formula, the computing module of engine electronic control unit calculates and obtains volumetric flow of gas q vAfter, may be output to display unit 20 and show.This display unit 20 can be specially the display screen that is arranged in the control cab, and the content of actual displayed can be real-time volumetric flow of gas q v, volumetric flow of gas maximum value max-q v, volumetric flow of gas minimum value min-q vPerhaps volumetric flow of gas mean value Avrg-q v, use for user's reference according to actual needs.
In addition, the comparison module of engine electronic control unit can also further effectively utilize and calculate the volumetric flow of gas q that obtains v, output alarm signal when air leak amount is too high.See also Fig. 4, the figure shows the control flow chart of control unit.
Particularly, be Rule of judgment with described volumetric flow of gas more than or equal to the first volumetric flow of gas threshold value, obtain to exist the failure judgment result; Have fault if judged result characterizes, then output alarm signal is to display unit.That is to say, according to specific motor and application situation thereof, those skilled in the art can preset the limits value of an air leak amount: the first volumetric flow of gas threshold value, when the volumetric flow of gas that calculate to obtain during more than or equal to the first volumetric flow of gas threshold value, output alarm signal then, such as, report to the police to dodge the sign indicating number form, the current air leak amount of prompting user has exceeded preset limit, and related components need be overhauled, and causes the fault of serious gas blowby with releasing.Certainly, also can be simultaneously in conjunction with the sound alarm mode.
Should be appreciated that in the engine operation process, will in certain amplitude interval, fluctuate by the volumetric flow of gas of the influence acquisition in real time of self structure and extraneous factor, therefore,, preferably adopt volumetric flow of gas mean value Avrg-q for improving its control accuracy vCompare judgement with the first volumetric flow of gas threshold value.
Yet, under the complete machine normal operating condition, the user tends to the alarm signal that the ignorance system sends, obviously, if motor is in for a long time and does not carry out system overhaul under the above-mentioned working state and safeguard, can cause the excessive wear of piston ring, cylinder sleeve equally or sticking of piston rings is stuck or problem such as fracture.For this reason, this programme has further been optimized control strategy, on the basis of aforementioned air leak amount limits value, a default limit limits value: the second volumetric flow of gas threshold value, here proportionate relationship between the first volumetric flow of gas threshold value of Ti Chuing and the second volumetric flow of gas threshold value, can determine as required fully, such as, the second volumetric flow of gas threshold value is set at 1.2 times of the first volumetric flow of gas threshold value.So being provided with, is Rule of judgment with volumetric flow of gas greater than the second volumetric flow of gas threshold value, obtains to start the judged result of extraction flow error diagnosis management.That is, when volumetric flow of gas during greater than the second volumetric flow of gas threshold value, the error diagnosis management system of ato unit then, and then export control signal limiting engine output torque as required; Such as, at the rotating speed of motor torque limiting during greater than 1500r/min.That is to say that even the user ignores the excessive alarm signal of air leak amount, native system also can avoid occurring badly damaging phenomenon at the output torque of limiting engine under the ultimate state.
What specify is volumetric flow of gas q vComputational methods be not limited to according to aforementioned formula and obtain.Usually, A 2＜＜A 1
Figure BDA0000070657990000081
In addition, also can be according to formula Calculate acquisition, in the formula:
The minimum passage section area of the described steam outlet pipe that a-is default;
Gas density in ρ-described steam outlet pipe;
Pressure reduction before and after the Δ p-throttling, i.e. p 1-p 2
The E of ε-described steam outlet pipe;
The flow coefficient of α-described steam outlet pipe.Wherein, E ε and flow coefficient α all can determine that those skilled in the art can realize fully based on prior art, so this paper repeats no more by existing experimental technique.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (10)

1. a deaerator is provided with the deaerator core in its housing, and described housing is provided with inlet tube, steam outlet pipe and the return tube that is communicated with medial compartment; It is characterized in that described steam outlet pipe has the throttling reducer; Described steam outlet pipe is provided with first pressure transducer and second pressure transducer, gathers the forward and backward pressure of throttling in the described steam outlet pipe respectively.
2. deaerator according to claim 1, it is characterized in that, the radially outstanding throttling reducer that forms cross section gradual change shape of the inwall of described steam outlet pipe, and offer the radially through hole that is connected with described second pressure transducer on the described steam outlet pipe of minimum passage section position, offer the radially through hole that is connected with described first pressure transducer on the described steam outlet pipe of described throttling reducer upstream side.
3. a crankcase gas leakage detects control system, comprising:
Deaerator as claimed in claim 1 or 2; With
Control unit, the pressure signal of gathering according to first, second pressure transducer on the described deaerator, and default gas density threshold value are exported the state detection signal of air leak amount in real time.
4. crankcase gas leakage according to claim 3 detects control system, it is characterized in that described control unit is specially engine electronic control unit.
5. crankcase gas leakage according to claim 4 detects control system, it is characterized in that, described engine electronic control unit calculates volumetric flow of gas q according to following formula v, and export the display unit demonstration to;
q V = A 2 1 - ( A 2 A 1 ) 2 2 ( p 1 - p 2 ) ρ , In the formula:
A 1The passage section area of the described steam outlet pipe of-default throttling reducer upstream side;
A 2The minimum passage section area of-default described steam outlet pipe;
p 1The pressure signal that-the first pressure transducer is gathered;
p 2The pressure signal that-the second pressure transducer is gathered;
Gas density in ρ-described steam outlet pipe.
6. crankcase gas leakage according to claim 4 detects control system, it is characterized in that, described engine electronic control unit calculates volumetric flow of gas q according to following formula v, and export the display unit demonstration to;
q V = αϵa 2 Δp ρ , In the formula:
The minimum passage section area of the described steam outlet pipe that a-is default;
Gas density in ρ-described steam outlet pipe;
Pressure reduction before and after the Δ p-throttling, i.e. p 1-p 2
The E of ε-described steam outlet pipe;
The flow coefficient of α-described steam outlet pipe.
7. detect control system according to claim 5 or 6 described crankcase gas leakages, it is characterized in that, described engine electronic control unit is Rule of judgment with described volumetric flow of gas more than or equal to the first volumetric flow of gas threshold value, obtains to exist the failure judgment result; Have fault if judged result characterizes, then output alarm signal is to display unit.
8. crankcase gas leakage according to claim 7 detects control system, it is characterized in that, described engine electronic control unit is Rule of judgment with described volumetric flow of gas greater than the second volumetric flow of gas threshold value, obtains to start the judged result of extraction flow error diagnosis management.
9. crankcase gas leakage according to claim 8 detects control system, it is characterized in that described volumetric flow of gas is specially mean value.
10. crankcase gas leakage according to claim 9 detects control system, it is characterized in that, needs to start extraction flow error diagnosis management if judged result characterizes, and then exports control signal limiting engine output torque.
CN201110171381A 2011-06-23 2011-06-23 Oil-gas separator and crankcase blow-by amount detection control system with same Pending CN102269030A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104568340A (en) * 2014-12-23 2015-04-29 潍柴动力股份有限公司 Method and system for early warning air leakage of piston
CN108197342A (en) * 2017-11-28 2018-06-22 中国航发沈阳发动机研究所 A kind of non-design gas leakage computational methods of aero-engine air system
CN108240246A (en) * 2016-12-27 2018-07-03 上海汽车集团股份有限公司 A kind of engine control and ECU
CN111022151A (en) * 2020-01-07 2020-04-17 中国重汽集团济南动力有限公司 Crankcase ventilation system of heavy natural gas engine
CN111361516A (en) * 2018-12-26 2020-07-03 联合汽车电子有限公司 Method for reminding vehicle maintenance
CN112282892A (en) * 2020-09-30 2021-01-29 潍柴动力股份有限公司 Control method, device and system for positive ventilation of crankcase
CN113027607A (en) * 2021-03-31 2021-06-25 潍柴动力股份有限公司 Fault detection method for oil-gas separator and related device
CN114320527A (en) * 2021-12-13 2022-04-12 重庆长安汽车股份有限公司 Crankcase ventilation structure

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6575022B1 (en) * 1995-11-25 2003-06-10 Cummins Engine Company, Inc. Engine crankcase gas blow-by sensor
CN101144406A (en) * 2007-11-09 2008-03-19 奇瑞汽车有限公司 Crankcase pressure control system
JP2009067336A (en) * 2007-09-18 2009-04-02 Yamaha Motor Co Ltd Motorcycle
US20100008934A1 (en) * 2008-07-02 2010-01-14 Celera Corporation Genetic polymorphisms associated with autoinflammatory diseases, methods of detection and uses thereof
CN101970814A (en) * 2008-03-18 2011-02-09 沃尔沃拉斯特瓦格纳公司 Method for functional diagnosis of a separator
CN202117733U (en) * 2011-06-23 2012-01-18 潍柴动力股份有限公司 Oil-gas separator and crankshaft case gas blowby quantity detection control system provided with same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6575022B1 (en) * 1995-11-25 2003-06-10 Cummins Engine Company, Inc. Engine crankcase gas blow-by sensor
JP2009067336A (en) * 2007-09-18 2009-04-02 Yamaha Motor Co Ltd Motorcycle
CN101144406A (en) * 2007-11-09 2008-03-19 奇瑞汽车有限公司 Crankcase pressure control system
CN101970814A (en) * 2008-03-18 2011-02-09 沃尔沃拉斯特瓦格纳公司 Method for functional diagnosis of a separator
US20100008934A1 (en) * 2008-07-02 2010-01-14 Celera Corporation Genetic polymorphisms associated with autoinflammatory diseases, methods of detection and uses thereof
CN202117733U (en) * 2011-06-23 2012-01-18 潍柴动力股份有限公司 Oil-gas separator and crankshaft case gas blowby quantity detection control system provided with same

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104568340A (en) * 2014-12-23 2015-04-29 潍柴动力股份有限公司 Method and system for early warning air leakage of piston
CN108240246A (en) * 2016-12-27 2018-07-03 上海汽车集团股份有限公司 A kind of engine control and ECU
CN108197342A (en) * 2017-11-28 2018-06-22 中国航发沈阳发动机研究所 A kind of non-design gas leakage computational methods of aero-engine air system
CN111361516A (en) * 2018-12-26 2020-07-03 联合汽车电子有限公司 Method for reminding vehicle maintenance
CN111022151A (en) * 2020-01-07 2020-04-17 中国重汽集团济南动力有限公司 Crankcase ventilation system of heavy natural gas engine
CN112282892A (en) * 2020-09-30 2021-01-29 潍柴动力股份有限公司 Control method, device and system for positive ventilation of crankcase
CN113027607A (en) * 2021-03-31 2021-06-25 潍柴动力股份有限公司 Fault detection method for oil-gas separator and related device
CN114320527A (en) * 2021-12-13 2022-04-12 重庆长安汽车股份有限公司 Crankcase ventilation structure
CN114320527B (en) * 2021-12-13 2024-03-22 重庆长安汽车股份有限公司 Crankcase ventilation structure

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Application publication date: 20111207