CN108368792A - Method and apparatus for controlling fuel system - Google Patents
Method and apparatus for controlling fuel system Download PDFInfo
- Publication number
- CN108368792A CN108368792A CN201680069871.6A CN201680069871A CN108368792A CN 108368792 A CN108368792 A CN 108368792A CN 201680069871 A CN201680069871 A CN 201680069871A CN 108368792 A CN108368792 A CN 108368792A
- Authority
- CN
- China
- Prior art keywords
- pressure
- limiting valve
- pressure limiting
- fuel
- operating status
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
- F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/2403—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially up/down counters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
- F02D41/3863—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/31—Control of the fuel pressure
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The present invention relates to a kind of methods for controlling fuel system, wherein, know whether there is the operating status that wherein pressure limiting valve is responded in a manner of possible, change meter reading when there are the operating status, and when meter reading reaches previously given value, the malfunction of pressure limiting valve is identified.
Description
Technical field
The present invention is based on a kind of methods of the generic according to independent claims.Subject of the present invention is also a kind of computer
The program code of program, machine readable storage medium, controller and combination processing instruction.
Technical background
A kind of method for controlling fuel system there is known by 199 13 477 A1 of DE.One is described there
Method of the kind for running the especially fuel delivery means of the internal combustion engine of motor vehicle, wherein, the fuel conveyed to internal combustion engine
Amount is controlled and/or regulated by flow control valve and the high-pressure pump of postposition.The cell voltage loaded according to flow control valve
And/or flow control valve is influenced according to the coil resistance of flow control valve.The output end of high-pressure pump is led back by excess pressure valve
The area of low pressure (zur ü ckgef ü hrt), the excess pressure valve are then also referred to as pressure limiting valve.
In a manner of common, high-pressure injection system has such pressure limiting valve, to avoid in the high pressure not allowed
It rises.When fuel is heated and builds pressure in systems, such as it is likely to occur such pressure not allowed after the cut
Rise.In addition, being for example likely to occur the pressure not allowed in case of a fault in the case where high-pressure pump constantly conveys with all strength
Power.In a manner of common, which is integrated into structure in high-pressure pump.Or the pressure limiting valve directly disconnects high pressure flow
Or to being disconnected in the conveying space of high-pressure pump in low tension loop.The opening pressure of pressure limiting valve preferably selects as follows,
So that opening in normal operation is on the one hand prevented, it on the other hand still can be without a doubt and with the good accuracy of measuring
Open high-pressure injection valve.Here, it is also contemplated that setting tolerance, aging, pressure adjusting error and pressure fluctuation and their temperature
Spend correlation.
In higher system pressure and higher fuel quantity to be sprayed, the pressure fluctuation bigger of appearance.In addition typical
Ground, under higher system pressure, the possible opening pressure of injection valve is relative to goal pressure by smaller.Therefore, pressure limiting valve
Opening pressure must be set in relatively low value.This may lead to the ideal design side that can no longer realize pressure limiting valve
Case.In order to reliably open injection valve, it is necessary to select the very low opening pressure of pressure limiting valve so that pressure limiting valve is in corresponding pressure
It may be opened when pulsation.Following situation may also occur, that is, in specific operating status, pressure limiting valve is undesirably opened.It beats
Open procedure may damage pressure limiting valve.Therefore, pressure limiting valve must correspondingly resistance to land used construct, so as not to damage.This causes to use
In the higher cost of pressure limiting valve and the larger structure space of high-pressure pump.On the other hand, thicker, bigger circuit can be passed through
Diameter makes pressure fluctuation minimize.Thus it also generates higher cost and needs more structure spaces in motor.As an alternative, may be used
To reduce goal pressure at high speed.The disadvantage is that being likely to occur increased particulate emission.
According to present invention identify that, which only carries out under specific operating status, which exists
It is often differently carried out in the different operations of the different driving modes or internal combustion engine of motor vehicle.In particular, the pressure arteries and veins
It is dynamic to combine low temperature to occur at high speed.
Invention content
The method of feature according to the present invention with independent claims has the following advantages that, that is, fuel system and horse
Size up to the component of structural shape is no longer necessary to ensure that pressure limiting valve is stable under conditions of " worst case " repeatedly
Property.That is fuel system is needed not necessarily need to be based on the frequent motor operation under maximum speed and under low fuel -/motor temperature
Driver design.Identify a small number of vehicles, their pressure limiting valve is by over load (beansprucht), and pressure phase
It reduces with answering (abgesenkt), wherein all one's effort driveability of motor vehicle is maintained at any time.Only few
Have a case that occur in the vehicle of correspondingly high motor load following rare, that is, high-pressure pump or pressure limiting valve must be replaced.I.e.
In the case of only running the driver of vehicle when fairly frequently in cold start-up with high rotating speed, perhaps in the vehicle service life phase
Between replace high-pressure pump or pressure limiting valve and be necessary.
Particularly advantageously, known and whether there is following operating status, the load for occurring pressure limiting valve wherein improves.
If there is such operating status, just change meter reading.When meter reading reaches previously given value, rising limit is identified
The malfunction of pressure valve.
In the first embodiment, when pressure value is more than repeatedly threshold value, malfunction is identified.For this purpose, working as pressure value
When more than threshold value, change meter reading.If meter reading reaches previously given value, malfunction is just identified.Here,
It is preferred that the pressure value of the pressure in the conveying space of consideration high-pressure pump.This is particularly advantageous, because the pressure value characterizes height
The load of press pump and pressure limiting valve.
In this second embodiment, when repeatedly there is the operating status that pressure limiting valve is responded in a manner of possible wherein,
Identify malfunction.For this purpose, when there is the operating status that pressure limiting valve is responded in a manner of possible wherein, change counter
Reading.When meter reading reaches previously given value, malfunction is identified.
When pressure or pressure difference at pressure limiting valve are more than the opening pressure of pressure limiting valve, it is then particularly present such operation
State, wherein pressure limiting valve responded in a manner of possible.
It can also be provided that as an alternative, not measure the pressure at pressure limiting valve or the pressure in conveying space, but according to
Pressure of the operation characteristic parameter from reading pressure limiting valve in Characteristic Field or the pressure in conveying space.This has the following advantages that, that is,
Without high-precision and quick device for pressure measurement.
It is provided that in advantageous first embodiment, the note in fault memorizer is carried out in the first meter reading
Enter.
It is provided that in advantageous second embodiment, reduces in the second meter reading and be used for fuel system
In fuel pressure desired value.
Particularly advantageously, the pressure in high-pressure area or in the conveying space of high-pressure pump is based on the internal combustion from Characteristic Field
Machine rotating speed, engine load, fuel temperature, cooling water temperature or fuel type are read.Particularly advantageously, when in parameter extremely
When a few parameter takes internal-combustion engine rotational speed, engine load, fuel temperature, cooling water temperature or fuel type ,-usual wherein
There is pressure fluctuation-, changes the content of counter.
In in a further aspect, the present invention relates to a kind of new program codes of combination processing instruction, especially have and compile
It translates and/or the source code of associated instructions, for establishing the computer program that can be run on the controller, wherein work as program code
When being converted into according to process instruction, that is, being especially compiled and/or be associated to the computer program that can be run, program generation
Code generates the computer program of all steps for implementing any one method in the above method.The program code especially can be with
Given by source code, these source codes can for example be downloaded from the server in internet.
Description of the drawings
The embodiment of the present invention is shown in the accompanying drawings and elaborates in the following description.Wherein：
Fig. 1 show the main element of fuel system and
Fig. 2 shows flow charts according to the method for the present invention.
Specific implementation mode
The main element of fuel system is shown in FIG. 1.Oily rail is indicated with 100, and fuel is from high-pressure pump 110
It is transported in the oil rail.The fuel conveyed from high-pressure pump 110 is provided by low-lift pump 120, which takes out from tank 130 should
Fuel quantity.The output end of high-pressure pump 110 and the input terminal of high-pressure pump can be connect with via pressure limiting valve 140.If in oily rail 100
Pressure rise is more than the pressure corresponding to the openings pressure of pressure limiting valve 140, the pressure limiting valve 140 turn on oily rail and area of low pressure it
Between interconnecting piece, the area of low pressure is between high-pressure pump 110 and low-lift pump 120.It can also be set in advantageous design scheme
It sets, pressure limiting valve 140 connects the conveying space of the output end of high-pressure pump and high-pressure pump.
Embodiment according to the method for the present invention is shown in Fig. 2.In first step 200, counter I is initialised
For value 0.And then in step 210, know the fuel pressure P at pressure limiting valve.Preferably, the value is from depending on different operations
(auslesen) is read in the Characteristic Field of characteristic parameter, these operation characteristic parameter representatives go out the operating status of internal combustion engine.Especially
Following parameter：Rotating speed, load, fuel temperature and/or fuel type are used as symbolizing the operation characteristic parameter of operating status.
This, can use one or more of these parameters parameter.It as an alternative, can also be by suitable sensor measurement fuel pressure
Power.
Back to back inquiry 220 checks whether fuel pressure P is more than the opening pressure of pressure limiting valveIf inquiry 220 is known
It is the situation not go out not, just re-starts step 210.If inquiry 220 identifies that fuel pressure is more than and opens pressure, just in step
Counter I is set to improve value 1 in rapid 230.Back to back inquiry 240 checks whether counter contents I is more than first threshold S1.Such as
Fruit is not the situation, just re-starts step 210.If that's the case, with regard to carrying out the note in fault memorizer in step 250
Enter.Back to back inquiry 260 checks due to being provided with fault memorizer and whether has carried out pressure limiting valve or whole when factory stops
The replacement of a high-pressure pump.If that's the case, counter I is just again configured to zero in step 200.If not the feelings
Condition, just checks whether counter I is more than second threshold S2 in other inquiry 270.If it is not the case, it just re-starts
Step 210.It if that's the case, just in step 280 will be down-set to low value for the desired value PS of oily rail pressure power.
It can be provided that in the design scheme of alternative, not check whether pressure is more than in step 210,220 and open
Pressure, but following operating status is checked for, wherein in a familiar manner due to pressure fluctuation more than opening pressureFor this purpose, preferably analyzing the identical operation characteristic parameter that be used to know pressure and use.Namely based in following parameter
At least one parameter decide whether that, there are following operating status, the parameter is load, rotating speed, fuel temperature and/or combustion
Expect type, wherein, in fact it could happen that be more than the opening pressure of pressure limiting valveIf this is the case it is verified similarly in step
Counter I is set to improve 1 in 230.
Furthermore, it is possible to be provided that as an alternative, it is based only upon threshold value and is checked, that is, can be provided that, more than threshold value
When setting fault memorizer or when more than threshold value reduce for pressure desired value PS.
It is provided that in particularly advantageous design scheme, occasionally (gelegentlich) knows opening pressure againWherein open pressure limiting valve.This for example occurs in the following way, that is, oily rail pressure power is slowly improved, until reaching opening
PressureAnd this is identified.The value for pressure that this knew again be used to open is in being used to other method.
Additionally or alternative in know on pressure limiting valve open pressure be more than that can also know the conveying space more than high-pressure pump
In maximum allowble pressure and handled in the corresponding way.Here, the pressure in the conveying space of high-pressure pump can borrow
Sensor is helped to measure or know based on other parameters, that is, calculate or read by Characteristic Field.
If the pressure value in the conveying space of high-pressure pump is more than threshold value, just correspondingly as when opening pressure and being more than
Change meter reading, and malfunction is identified based on meter reading.
Claims (12)
1. a kind of method for controlling fuel system, the fuel system includes high-pressure pump and pressure limiting valve, wherein
It knows whether the operating status that there is the load for the raising that there is the pressure limiting valve wherein, changes when there are the operating status
Become meter reading, and when meter reading reaches previously given value, identifies the malfunction of pressure limiting valve.
2. according to the method described in claim 1, it is characterized in that, when pressure limiting valve is responded in a manner of possible, exist in this way
Operating status.
3. according to the method described in claim 1, it is characterized in that, when the pressure value in the conveying space of high-pressure pump is more than threshold value
When, there are such operating statuses.
4. according to the method described in claim 1, it is characterized in that, being carried out in fault memorizer in the first meter reading
It charges to.
5. method according to claim 1 or 4, which is characterized in that reduce in the second meter reading and be used for the combustion
Expect the desired value of the fuel pressure in supply system.
6. according to the method described in claim 1, it is characterized in that, in order to recognise that in the presence of pressure limiting valve wherein with possible
The operating status that responds of mode, be analyzed as follows at least one of parameter parameter, the parameter is rotating speed, load, fuel temperature
Degree or fuel type.
7. according to the method described in claim 1, it is characterized in that, when fuel pressure is more than threshold value, identify in the presence of at it
The operating status that middle pressure limiting valve is responded in a manner of possible.
8. according to any method of the preceding claims, which is characterized in that know the combustion for opening pressure limiting valve wherein
Expect pressure.
9. a kind of computer program, the computer program is configured to implement according to any one of claim 1 to 8
All steps of any one of method method.
10. a kind of machine readable storage medium is stored on the machine readable storage medium according to claim 9 institute
The computer program stated.
11. a kind of controller, the controller is configured to implement in method according to any one of claim 1 to 8
Any one method all steps.
12. a kind of program code, combination processing instruction is for establishing the computer program that can be run on the controller, wherein when
When said program code is translated into the computer program of operation according to process instruction, said program code is generated according to right
It is required that the computer program described in 9.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102015223703.6A DE102015223703A1 (en) | 2015-11-30 | 2015-11-30 | Method and device for controlling a fuel supply system |
| DE102015223703.6 | 2015-11-30 | ||
| PCT/EP2016/076790 WO2017092972A1 (en) | 2015-11-30 | 2016-11-07 | Method and device for controlling a fuel supply system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108368792A true CN108368792A (en) | 2018-08-03 |
| CN108368792B CN108368792B (en) | 2022-01-11 |
Family
ID=57326354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680069871.6A Active CN108368792B (en) | 2015-11-30 | 2016-11-07 | Method and apparatus for controlling a fuel supply system |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN108368792B (en) |
| DE (1) | DE102015223703A1 (en) |
| WO (1) | WO2017092972A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111255565A (en) * | 2020-01-17 | 2020-06-09 | 一汽解放汽车有限公司 | Failure monitoring device for mechanical PCV (positive pressure regulator) of high-pressure common rail system |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017216989B4 (en) * | 2017-09-25 | 2019-07-18 | Mtu Friedrichshafen Gmbh | Method for operating an internal combustion engine with an injection system and injection system for carrying out such a method |
| FR3074851B1 (en) * | 2017-12-08 | 2021-09-10 | Continental Automotive France | ALERT PROCEDURE FOR PREDICTIVE MAINTENANCE OF A HIGH PRESSURE PUMP IN AN INTERNAL COMBUSTION ENGINE |
| DE102017222559B4 (en) | 2017-12-13 | 2021-03-11 | Vitesco Technologies GmbH | Method and device for predicting the point in time of failure of the pressure relief valve of a high-pressure fuel pump of a motor vehicle |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07286541A (en) * | 1994-03-02 | 1995-10-31 | Ford Motor Co | Internal combustion engine with car diagnostic device for detecting malfunction of fuel-duct pressure regulator |
| JPH1068328A (en) * | 1996-07-03 | 1998-03-10 | Robert Bosch Gmbh | Monitoring method for injection system and device therefor |
| EP0886056A1 (en) * | 1997-06-20 | 1998-12-23 | Robert Bosch Gmbh | Method and apparatus for monitoring a fuel supply system |
| DE19937962A1 (en) * | 1999-08-11 | 2001-02-15 | Bosch Gmbh Robert | IC engine common-rail fuel injection system control method monitors valve inserted between high pressure and low pressure regions for indicating fault |
| US6283108B1 (en) * | 1998-08-31 | 2001-09-04 | Hitachi, Ltd. | Fuel injection control arrangement for internal combustion engine with abnormality detection function therein |
| US6578553B1 (en) * | 1999-04-09 | 2003-06-17 | Robert Bosch Gmbh | Common-rail system comprising a controlled high-pressure pump as a second pressure regulator |
| JP2007100624A (en) * | 2005-10-06 | 2007-04-19 | Denso Corp | Fuel injection device |
| JP2009257277A (en) * | 2008-04-21 | 2009-11-05 | Denso Corp | High pressure fuel control device |
| CN102016271A (en) * | 2008-04-30 | 2011-04-13 | 欧陆汽车有限责任公司 | Method for determining the rail pressure in a common rail system, and common rail injection system |
| CN103573449A (en) * | 2013-11-19 | 2014-02-12 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Method for controlling common rail pressure limiting valve |
| CN103635677A (en) * | 2011-05-02 | 2014-03-12 | Mtu腓特烈港有限责任公司 | Method for controlling and regulating an internal combustion engine |
| JP2016070215A (en) * | 2014-09-30 | 2016-05-09 | トヨタ自動車株式会社 | Abnormality determination device for pressure reduction valve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19913477B4 (en) | 1999-03-25 | 2004-08-26 | Robert Bosch Gmbh | Method for operating a fuel supply device of an internal combustion engine, in particular a motor vehicle |
-
2015
- 2015-11-30 DE DE102015223703.6A patent/DE102015223703A1/en active Pending
-
2016
- 2016-11-07 CN CN201680069871.6A patent/CN108368792B/en active Active
- 2016-11-07 WO PCT/EP2016/076790 patent/WO2017092972A1/en active Application Filing
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07286541A (en) * | 1994-03-02 | 1995-10-31 | Ford Motor Co | Internal combustion engine with car diagnostic device for detecting malfunction of fuel-duct pressure regulator |
| JPH1068328A (en) * | 1996-07-03 | 1998-03-10 | Robert Bosch Gmbh | Monitoring method for injection system and device therefor |
| EP0886056A1 (en) * | 1997-06-20 | 1998-12-23 | Robert Bosch Gmbh | Method and apparatus for monitoring a fuel supply system |
| US6283108B1 (en) * | 1998-08-31 | 2001-09-04 | Hitachi, Ltd. | Fuel injection control arrangement for internal combustion engine with abnormality detection function therein |
| US6578553B1 (en) * | 1999-04-09 | 2003-06-17 | Robert Bosch Gmbh | Common-rail system comprising a controlled high-pressure pump as a second pressure regulator |
| DE19937962A1 (en) * | 1999-08-11 | 2001-02-15 | Bosch Gmbh Robert | IC engine common-rail fuel injection system control method monitors valve inserted between high pressure and low pressure regions for indicating fault |
| JP2007100624A (en) * | 2005-10-06 | 2007-04-19 | Denso Corp | Fuel injection device |
| JP2009257277A (en) * | 2008-04-21 | 2009-11-05 | Denso Corp | High pressure fuel control device |
| CN102016271A (en) * | 2008-04-30 | 2011-04-13 | 欧陆汽车有限责任公司 | Method for determining the rail pressure in a common rail system, and common rail injection system |
| CN103635677A (en) * | 2011-05-02 | 2014-03-12 | Mtu腓特烈港有限责任公司 | Method for controlling and regulating an internal combustion engine |
| CN103573449A (en) * | 2013-11-19 | 2014-02-12 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Method for controlling common rail pressure limiting valve |
| JP2016070215A (en) * | 2014-09-30 | 2016-05-09 | トヨタ自動車株式会社 | Abnormality determination device for pressure reduction valve |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111255565A (en) * | 2020-01-17 | 2020-06-09 | 一汽解放汽车有限公司 | Failure monitoring device for mechanical PCV (positive pressure regulator) of high-pressure common rail system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2017092972A1 (en) | 2017-06-08 |
| DE102015223703A1 (en) | 2017-06-01 |
| CN108368792B (en) | 2022-01-11 |
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