WO2009059886A1 - Verfahren und vorrichtung zur überprüfung eines ventilhubumschaltungsprozesses - Google Patents
Verfahren und vorrichtung zur überprüfung eines ventilhubumschaltungsprozesses Download PDFInfo
- Publication number
- WO2009059886A1 WO2009059886A1 PCT/EP2008/064162 EP2008064162W WO2009059886A1 WO 2009059886 A1 WO2009059886 A1 WO 2009059886A1 EP 2008064162 W EP2008064162 W EP 2008064162W WO 2009059886 A1 WO2009059886 A1 WO 2009059886A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- valve lift
- switching
- review
- lift switching
- error
- Prior art date
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
- F02D41/22—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
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0203—Variable control of intake and exhaust valves
- F02D13/0207—Variable control of intake and exhaust valves changing valve lift or valve lift and timing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
- F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0005—Deactivating valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2800/00—Methods of operation using a variable valve timing mechanism
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2800/00—Methods of operation using a variable valve timing mechanism
- F01L2800/11—Fault detection, diagnosis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2800/00—Methods of operation using a variable valve timing mechanism
- F01L2800/14—Determining a position, e.g. phase or lift
-
- 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
- F02D41/0002—Controlling intake air
- F02D2041/001—Controlling intake air for engines with variable valve actuation
-
- 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
- F02D2041/227—Limping Home, i.e. taking specific engine control measures at abnormal conditions
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Definitions
- the invention relates to a method and a device for checking a valve lift switching process in a motor vehicle.
- Electro-hydraulic valve lift switching is generally known in the art.
- An example of an electro-hydraulic valve lift switching system is the VARIO CAM PLUS system from INA. It is a two-stage Ventilhubschaltsystem, in which a
- Ver ⁇ egelungselement is actuated by means of oil pressure against a spring in a Heidelbergstassendorfel or a Heidelbergschlepphebel and so, according to the activation or deactivation state, can be switched between two different valve lift curves.
- a solenoid valve located in the oil circuit (3/2 way valve) is energized, which then opens.
- the oil pressure builds up and the Ver ⁇ egelungselement moves against the spring until the Ver ⁇ egelungsvorgang is completed. If the solenoid valve is closed again, the oil pressure breaks down via a leakage line and the locking element slides, activated by the spring force, back to its original position.
- the object of the invention is therefore to provide a method and a device which reduce the occurrence or the number of switching errors.
- this object is achieved by a review of a valve lift of an engine is performed, it being first determined whether a switching error and / or an external event has occurred, which may affect the operation of the valve lift. If at least one of these events occurs, the valve lift changeover is initially blocked. Then the valve lift is activated and checked in a non-critical state. If the check reveals that the valve lift switchover shows no abnormalities during the non-critical operating state, the valve lift changeover is released again.
- Switchover errors can be reduced by early checking valve lift switching, for example, when a first switchover error has occurred.
- the valve lift is only allowed or activated in a non-critical operating condition, while the
- Valve switching is blocked in the other BetbebsParken. In this way, the occurrence of further switching errors can be prevented.
- valve lift is disabled for all operating conditions when a switching error occurs or an external event that may affect the valve lift can be negative. In this way it can be ensured that, for example, no further switching errors can occur before it has been clarified whether an occurred (single) switching error was a coincidence or an error in the valve lift is present.
- valve lift is enabled again for all operating conditions, including for the critical operating conditions when it has been determined in the review that the valve lift switching no
- an uncritical operating state includes, for example, operating states such as a fuel cut-off phase or operating points in which substantially no or only a slight torque jump is to be expected during valve-lift switching.
- operating states such as a fuel cut-off phase or operating points in which substantially no or only a slight torque jump is to be expected during valve-lift switching.
- valve lift switching for checking the valve lift switching, for example, it switches back and forth between two cam profile at least once or several times.
- Valve lift each tested for their function the correct function is determined, for example, based on at least one or more parameters, such as Oldruckverlauf, the switching timing, the switching sequence and / or the cylinder pressure curve. In this way, it can be easily and reliably determined whether or not there is an actual error in the valve lift switching.
- the valve lift changeover is initially activated only for at least one noncritical operating state and a renewed check of the valve lift changeover is carried out. If the valve lift switch now shows no abnormalities, the valve lift can be released for all operating conditions. In this way it can be ensured that a valve lift switching is only released when the fault is reliably corrected. Otherwise, a new adaptation of at least one parameter takes place. If necessary, this cycle can be run through several times before, for example, after a certain number of cycles an error message is issued to the driver, in which it is determined that an error in the valve lift switching occurs and a workshop should be visited, since the error can not be corrected ,
- Fig. 1 is a flowchart of the valve lift switching according to the invention.
- Fig. 1 is a flowchart for carrying out a
- a step S1 it is first determined whether a (single) switching error has occurred and / or whether there is another external event which has an influence on the stroke switching process.
- External influencing variables on the stroke switching or external events which may have a negative influence on the valve lift switching, are furthermore, for example, the following:
- the engine control unit (ECU) is informed. This is done, for example, via one or more diagnostic lines (K line), CAN buses, LIN buses or other suitable interfaces.
- K line diagnostic lines
- CAN buses CAN buses
- LIN buses or other suitable interfaces.
- a flag is set in the engine controller (ECU) when a switching error occurs or when at least one external event occurs that causes an influence, i. a negative influence that Hubumschaltrea can have on.
- Ventilhubumscnies in a next step S3 prophylactically blocked The same applies if a switching error occurs, this can also be reported to the engine control and a flag or be set.
- step S4 the stroke changeover is activated only during non-critical operating states, while it remains blocked during critical operating states.
- step S5 the switch to the non-critical
- An uncritical operating state is, for example, the fuel cut-off phase, in which a driver, for example, goes off the gas pedal.
- a driver for example, goes off the gas pedal.
- the overrun cutoff phase essentially no active torque is demanded of the engine and essentially no fuel is injected.
- Further Uncritical operating conditions result, for example, in operating points in which essentially no or only a small torque jump is to be expected during the stroke changeover. In other words, in such operating points there is almost or essentially momentary neutrality.
- the influence of the different valve lift curves on the engine braking torque and the effect on the ride comfort during the overrun phase are largely negligible or can be eliminated by adjusting the throttle position, so that no unpleasant driving sensation arises for the driver through the review.
- step S6 If there are no abnormalities in the stroke switching during the test phase or check phase (step S6), it is to be assumed that the external event that has occurred, in the present example the work on the valve lift switchover, has no negative influence on the switchover system. The same applies if, for example, a switching error has occurred previously. If, in this case, it is determined that no abnormalities have also occurred during the test phase, it is assumed that the switching error that has occurred is coincidental.
- the Hubumscrien is then released in a step S7 for all Motorbet ⁇ ebsstere again, including for the critical operating conditions.
- step S8 If, on the other hand, it is determined in step S8 that abnormalities in the switching occur during the testing and checking of the switchover to a faultless function in the uncritical driving conditions, then appropriate measures are taken in a step S9.
- a deviating behavior in the Hubumsclien for example, in the form of a modified Olbuchuous or degradation, a modified Wegtimmgs, a changed cylinder pressure build-up or a change in the
- valve lift switchover occurs too early or too late during the check, an adjustment of, for example, the shift range is made as a parameter in order to appropriately correct the valve lift switch so that they show no further abnormalities at a next check. If, however, for example, found in the review of the valve lift, that no valve lift has taken place, although in the non-critical operating condition such had to take place, the valve lift remains blocked., Since there is a fault that no longer remedied with an adjustment of the Wegtimmgs can be.
- an error image of the cylinders can also be evaluated. If, for example, a delayed valve lift always occurs in the same cylinder, the order of the cylinders can be used, for example
- Switching as a parameter can be changed.
- the cylinder can now be controlled so that it has, for example, more time to switch by not being switched first but last. If the error occurs again in the next verification, despite a previous one
- a warning signal can be issued to the driver be that the valve lift is faulty and he should visit a workshop.
- the error can also be stored so that it can be retrieved and evaluated in a workshop, for example.
- step S9 After adaptation of at least one stroke switching-relevant control parameter in step S9, the flowchart thus goes back to step S4, in which the Hubumsclien is first activated again only during non-critical operating conditions.
- step S5 the switching operation is re-tested and checked. Only when the testing and checking shows that the switching shows no abnormalities is a release of the Hubumscnies for all operating conditions in step S7. Otherwise, stroke switching-relevant control parameters must be further adjusted (step S9). In this case, the step of checking and re-fitting can be performed in a predetermined number. If there is still an abnormality of the valve lift switchover, then a
- Warning signal to be issued to the driver. In this way, it can be prevented that a constant adjustment takes place, although there is a fault that can not be resolved with an adjustment alone, but where, for example, a workshop must be visited. In this case, this can be communicated to the driver in a timely manner.
- the engine control device may be connected to at least one or more sensors detecting a switching error. Further, as previously described, the engine controller is notified via a suitable interface when an external event occurs that may affect the operation of the valve lift switch.
- the motor control can have a corresponding device with which it is determined whether a switching error has been detected by the sensor or the sensors or whether an external event has occurred.
- About the Engine control device can then be blocked according to the valve lift, preferably for all operating conditions. Further, the engine controller may activate the valve lift switch for at least one or more non-critical operating conditions only to perform a check on the valve lift switchover. If the engine control determines that the valve lift switchover has abnormalities in the respective uncritical operating state, then it can carry out a suitable adaptation or adaptation of parameters in order to achieve the desired value
- the advantage of the method and the device according to the invention consists essentially in the fact that after an external intervention (eg changing the engine oil, working on the valve lift switching, etc.) or after a single switching error, the system is given the opportunity to test itself and if necessary to adapt or adapt. The risk of a (serious) switching error is thus reduced to a minimum. Furthermore, drivers and occupants are not affected by any loss of comfort, since the review is carried out in uncritical BetbeebsJen.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/741,233 US20100262355A1 (en) | 2007-11-08 | 2008-10-21 | Method and device for examining a valve lift switching process |
KR1020107012016A KR101536100B1 (ko) | 2007-11-08 | 2008-10-21 | 밸브 리프트 스위칭 프로세스를 검사하는 방법 및 장치 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007053257A DE102007053257B4 (de) | 2007-11-08 | 2007-11-08 | Verfahren und Vorrichtung zur Überprüfung eines Ventilhubumschaltungsprozesses |
DE102007053257.3 | 2007-11-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009059886A1 true WO2009059886A1 (de) | 2009-05-14 |
Family
ID=40459601
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2008/064162 WO2009059886A1 (de) | 2007-11-08 | 2008-10-21 | Verfahren und vorrichtung zur überprüfung eines ventilhubumschaltungsprozesses |
Country Status (4)
Country | Link |
---|---|
US (1) | US20100262355A1 (de) |
KR (1) | KR101536100B1 (de) |
DE (1) | DE102007053257B4 (de) |
WO (1) | WO2009059886A1 (de) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20090126619A (ko) * | 2008-06-04 | 2009-12-09 | 현대자동차주식회사 | 차량의 씨 디 에이 장치 진단시스템 및 그 방법 |
JP5565471B2 (ja) * | 2010-11-18 | 2014-08-06 | トヨタ自動車株式会社 | 内燃機関の制御装置 |
JP6107529B2 (ja) | 2013-08-09 | 2017-04-05 | トヨタ自動車株式会社 | 内燃機関 |
KR20170016460A (ko) * | 2014-06-17 | 2017-02-13 | 스카니아 씨브이 악티에볼라그 | 내연 기관의 밸브의 진단 방법 및 장치 |
US11644384B2 (en) * | 2018-05-21 | 2023-05-09 | Ford Motor Company | Device and method for cold testing engine component operation |
DE102018213342A1 (de) * | 2018-08-08 | 2020-02-13 | Bayerische Motoren Werke Aktiengesellschaft | Verfahren zur Diagnose einer Brennkraftmaschine |
GB2598766B (en) * | 2020-09-11 | 2024-02-14 | Chillibongo Pets Ltd | Toy for a pet |
US11306668B1 (en) * | 2021-01-06 | 2022-04-19 | Ford Global Technologies, Llc | Methods and systems for engine valve timing or lift adjustment |
CN114562349B (zh) * | 2021-03-02 | 2022-12-06 | 长城汽车股份有限公司 | 基于可变气门升程机构的控制方法及电子设备 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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EP0894958A2 (de) * | 1997-07-31 | 1999-02-03 | Dr.Ing.h.c. F. Porsche Aktiengesellschaft | Fehlererkennungseinrichtung für Brennkraftmaschinen und ein Verfahren zum Betreiben einer Brennkraftmaschine |
US6397799B1 (en) * | 1998-05-29 | 2002-06-04 | Siemens Vdo Automotive S.A.S. | Method for controlling a valve lift device |
US20040007195A1 (en) * | 2002-07-15 | 2004-01-15 | Grewal Amanpal S. | Method and apparatus for cleaning an oil control valve for an internal combustion engine |
DE10323877A1 (de) * | 2003-05-26 | 2004-12-23 | Siemens Ag | Vorrichtung zur hydraulischen Ventilhubumschaltung |
JP2007205296A (ja) * | 2006-02-03 | 2007-08-16 | Toyota Motor Corp | 内燃機関動弁装置 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS5834660B2 (ja) * | 1975-12-25 | 1983-07-28 | 日産自動車株式会社 | クウネンピセイギヨソウチ |
DE19832020C1 (de) * | 1998-07-16 | 1999-04-01 | Bosch Gmbh Robert | Verfahren und Vorrichtung zum Überwachen der Funktion zweier Abgasturbolader |
DE19857183A1 (de) * | 1998-12-11 | 2000-06-15 | Bosch Gmbh Robert | Diagnose einer variablen Ventilsteuerung bei Verbrennungsmotoren |
JP4517515B2 (ja) * | 2001-02-14 | 2010-08-04 | マツダ株式会社 | 自動車用4サイクルエンジン |
DE10355336A1 (de) * | 2003-11-27 | 2005-06-23 | Robert Bosch Gmbh | Verfahren zur Überwachung einer Ventilhubumschaltung |
US7146851B2 (en) * | 2004-01-29 | 2006-12-12 | Denso Corporation | Diagnostic apparatus for variable valve control system |
JP2005214102A (ja) * | 2004-01-30 | 2005-08-11 | Denso Corp | 筒内噴射式内燃機関の制御装置 |
DE102005029137B3 (de) * | 2005-06-23 | 2007-02-15 | Dr.Ing.H.C. F. Porsche Ag | Verfahren und Steuergerät zur Diagnose eines Gaswechsel-Ventilhub-Verstellsystems eines Verbrennungsmotors |
DE102005048704B3 (de) * | 2005-10-11 | 2007-05-10 | Siemens Ag | Verfahren zur Optimierung einer Ventilhubumschaltung bei Ottomotoren |
JP4492523B2 (ja) * | 2005-10-31 | 2010-06-30 | トヨタ自動車株式会社 | 圧縮比とバルブ特性を変更可能な内燃機関 |
-
2007
- 2007-11-08 DE DE102007053257A patent/DE102007053257B4/de active Active
-
2008
- 2008-10-21 WO PCT/EP2008/064162 patent/WO2009059886A1/de active Application Filing
- 2008-10-21 US US12/741,233 patent/US20100262355A1/en not_active Abandoned
- 2008-10-21 KR KR1020107012016A patent/KR101536100B1/ko active IP Right Grant
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0894958A2 (de) * | 1997-07-31 | 1999-02-03 | Dr.Ing.h.c. F. Porsche Aktiengesellschaft | Fehlererkennungseinrichtung für Brennkraftmaschinen und ein Verfahren zum Betreiben einer Brennkraftmaschine |
US6397799B1 (en) * | 1998-05-29 | 2002-06-04 | Siemens Vdo Automotive S.A.S. | Method for controlling a valve lift device |
US20040007195A1 (en) * | 2002-07-15 | 2004-01-15 | Grewal Amanpal S. | Method and apparatus for cleaning an oil control valve for an internal combustion engine |
DE10323877A1 (de) * | 2003-05-26 | 2004-12-23 | Siemens Ag | Vorrichtung zur hydraulischen Ventilhubumschaltung |
JP2007205296A (ja) * | 2006-02-03 | 2007-08-16 | Toyota Motor Corp | 内燃機関動弁装置 |
Also Published As
Publication number | Publication date |
---|---|
KR20100096123A (ko) | 2010-09-01 |
DE102007053257A1 (de) | 2009-06-04 |
KR101536100B1 (ko) | 2015-07-13 |
DE102007053257B4 (de) | 2009-08-27 |
US20100262355A1 (en) | 2010-10-14 |
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