Method of operating an internal combustion engine
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02D-041/00
F02B-013/00
출원번호
UP-0627561
(2009-11-30)
등록번호
US-7853397
(2011-02-10)
우선권정보
DE-10 2007 025 076(2007-05-30)
발명자
/ 주소
Pott, Ekkehard
Theobald, Jörg
출원인 / 주소
Volkswagen Aktiengesellschaft
대리인 / 주소
Greenberg, Laurence A.
인용정보
피인용 횟수 :
6인용 특허 :
10
초록▼
A method relates to operating an internal combustion engine in the form of an Otto engine, especially of a motor vehicle. Otto engine fuel (i.e., carburetor fuel, spark ignition engine fuel), such as gasoline or ethanol (E85), are directly injected into at least one combustion chamber of the interna
A method relates to operating an internal combustion engine in the form of an Otto engine, especially of a motor vehicle. Otto engine fuel (i.e., carburetor fuel, spark ignition engine fuel), such as gasoline or ethanol (E85), are directly injected into at least one combustion chamber of the internal combustion engine with at least one fuel injector. Optionally, instead of injecting ignition spark engine fuel or in addition, the internal combustion engine is operated with gas, especially CNG (compressed natural gas) or LPG (liquefied petroleum gas). During operation of the internal combustion engine with gas only, the engine is automatically switched to the operation with spark ignition engine fuel for a predetermined period, or the engine is switched to the operation with spark ignition engine fuel in addition to the operation with gas, in such a manner that a predetermined quantity of the carburetor fuel flows through the at least one fuel injector. The engine is then automatically switched back to the operation with gas only.
대표청구항▼
The invention claimed is: 1. A method of operating an internal combustion engine, the method which comprises: injecting carburetor fuel directly into a combustion space of the internal combustion engine by way of at least one fuel injector; selectively operating the internal combustion engine, inst
The invention claimed is: 1. A method of operating an internal combustion engine, the method which comprises: injecting carburetor fuel directly into a combustion space of the internal combustion engine by way of at least one fuel injector; selectively operating the internal combustion engine, instead of with the injection of carburetor fuel or in addition to the injection of carburetor fuel, with gas; during an operation of the internal combustion engine solely with gas, effecting an automated changeover to operation with carburetor fuel for a predetermined time span or to mixed operation with carburetor fuel and gas in order to conduct a predetermined quantity of carburetor fuel to flow through the at least one fuel injector; and subsequently automatically switching back to the operation of the internal combustion engine solely with gas. 2. The method according to claim 1, wherein the internal engine is an Otto engine in a motor vehicle. 3. The method according to claim 1, wherein the carburetor fuel is gasoline or ethanol (E85). 4. The method according to claim 1, wherein the gas is compressed natural gas (CNG) or liquefied petroleum gas (LPG). 5. The method according to claim 1, wherein the changeover to operation with carburetor fuel or the mixed operation with carburetor fuel is effected in predetermined operating phases and/or under predetermined operating conditions of the internal combustion engine. 6. The method according to claim 5, wherein the predetermined operating phases are selected from the group consisting of idling, an initiation of an overrun cut-off phase, and a termination of an overrun cut-off phase of the internal combustion engine. 7. The method according to claim 5, which comprises, after a predetermined operating phase and/or a predetermined operating condition has occurred in which the changeover to operation with carburetor fuel or the mixed operation with gas and carburetor fuel is to take place, allowing a predetermined dead time to elapse until the changeover to operation with carburetor fuel is effected or the mixed operation with gas and carburetor fuel actually takes place. 8. The method according to claim 7, wherein the predetermined dead time amounts to between 2 seconds and 10 seconds. 9. The method according to claim 7, wherein the predetermined dead time amounts to 5 seconds. 10. The method according to claim 5, wherein the predetermined operating conditions comprise a coolant temperature of at least 40° C. 11. The method according to claim 1, which comprises setting the predetermined quantity of carburetor fuel to flow through the at least one fuel injector during the carburetor fuel injection phase to a portion of the volume of carburetor fuel stored in a fuel injector. 12. The method according to claim 1, which comprises setting the predetermined quantity of carburetor fuel to flow through the at least one fuel injector during the carburetor fuel injection phase to an entire and/or a multiple of a volume of carburetor fuel stored in the fuel injector. 13. The method according to claim 12, wherein the multiple of the volume of carburetor fuel stored in a fuel injector comprises 2 to 200 times the volume stored in a fuel injector. 14. The method according to claim 12, wherein the multiple of the volume of carburetor fuel stored in a fuel injector comprises 3 to 5 times the volume stored in a fuel injector. 15. The method according to claim 1, which comprises determining a thermal load upon the at least one fuel injector during operation with gas as a function of an engine operating point and also weighting the thermal load and integrating over time, and automatically changing over to and/or starting mixed operation with the injection of carburetor fuel during the operation with gas when the thermal load overshoots a predetermined threshold value. 16. The method according to claim 1, which comprises, following an automatically activated carburetor fuel injection phase, blocking a further automated activation for a predetermined blocking time before a renewed automated activation of carburetor fuel injection is permitted. 17. The method according to claim 16, which comprises setting the blocking time to between 200 seconds and 40,000 seconds. 18. The method according to claim 17, which comprises setting the blocking time to between 2000 seconds and 10,000 seconds. 19. The method according to claim 17, which comprises setting the blocking time to approximately 5000 seconds. 20. The method according to claim 1, which comprises, after a predetermined maximum time of operation of the internal combustion engine with gas, during which no automated activation of the injection of carburetor fuel has taken place, activating the injection of carburetor fuel in an automated manner independently of an operating state and operating parameters of the internal combustion engine. 21. The method according to claim 20, wherein the maximum time amounts to between 500 seconds and 60,000 seconds. 22. The method according to claim 21, wherein the maximum time amounts to between 3000 seconds and 15,000 seconds. 23. The method according to claim 21, wherein the maximum time amounts to approximately 6000 seconds. 24. The method according to claim 21, which comprises, following an automatically activated carburetor fuel injection phase, blocking a further automated activation for a predetermined blocking time before a renewed automated activation of carburetor fuel injection is permitted, and starting the maximum time to run only after the end of a blocking time.
Tubb John Howard,AUX ; Dickson Gavin Warran,AUX ; Caley David James,AUX ; Guthrie Paul William,AUX ; Baasch Oswald, Fuel injection system for internal combustion engines.
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Bzymek, Raymond; Dunn, Mark E.; Wu, Ning; Zhang, Dehong; Marriott, Craig D.; Cowgill, Joshua D.; Moscherosch, Ben W., Fuel system protection in a multi-fuel system internal combustion engine.
Cowgill, Joshua; Moscherosch, Ben W., System and method for adjusting fuel mass for minimum fuel injector pulse widths in multiple fuel system engines.
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