IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0291609
(2002-11-12)
|
우선권정보 |
DE-0056408 (2001-11-16) |
발명자
/ 주소 |
- Schueler, Peter
- Bruehmann, Werner
- Frank, Kurt
- Kieferle, Stefan
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
9 |
초록
▼
A fuel injection system having a prefeed pump, through which fuel from a fuel supply container is pumped to a high-pressure pump, and by means of the high-pressure pump, fuel is pumped into a reservoir. Communicating with the reservoir is at least one injector, through which fuel is injected to the
A fuel injection system having a prefeed pump, through which fuel from a fuel supply container is pumped to a high-pressure pump, and by means of the high-pressure pump, fuel is pumped into a reservoir. Communicating with the reservoir is at least one injector, through which fuel is injected to the engine. A fuel filter is disposed between the prefeed pump and the high-pressure pump. A return line for uninjected fuel leads back from at least one injector into a region upstream of the high-pressure pump. A valve is provided, by which the return line, in a first switching position, at a low fuel temperature, leads to upstream of the fuel filter, between it and the prefeed pump, and by which the return line, in a second switching position, at a high fuel temperature, leads to downstream of the fuel filter, between it and the high-pressure pump.
대표청구항
▼
1. A fuel injection system for an internal combustion engine, the injection system comprising,a high pressure pump ( 18 ),a prefeed pump ( 10 ) by which fuel is pumped out of a fuel supply container ( 12 ) to the high-pressure pump ( 18 ),a reservoir ( 24 ) connected to the high pressure pump ( 18 )
1. A fuel injection system for an internal combustion engine, the injection system comprising,a high pressure pump ( 18 ),a prefeed pump ( 10 ) by which fuel is pumped out of a fuel supply container ( 12 ) to the high-pressure pump ( 18 ),a reservoir ( 24 ) connected to the high pressure pump ( 18 ) for receiving the high-pressure fuel,at least one injector communicating with the reservoir ( 24 ) for injecting fuel into the engine,a fuel filter ( 20 ), disposed between the prefeed pump ( 10 ) and the high-pressure pump ( 18 ),a return line ( 38 ) for uninjected fuel leads back from at least one injector ( 26 ) into a region upstream of the high-pressure pump ( 18 ), anda valve ( 40 ) connected in the return line ( 38 ), the valve ( 40 ) being operable in a first switching position to connect the return line ( 30 ) at a position upstream of the fuel filter ( 20 ), between the filter and the prefeed pump ( 10 ), and a second switching piston connecting the return line ( 38 ), to the return line ( 38 ) downstream of the fuel filter ( 20 ), between it and the high-pressure pump ( 18 ). 2. The fuel injection system according to claim 1 wherein the valve ( 40 ) is controlled as a function of the temperature of the returned fuel in such a way that at a low fuel temperature it assumes its first switching position, so that the return line ( 38 ) leads to upstream of the fuel filter ( 20 ), and at a high fuel temperature it assumes its second switching position, so that the return line ( 38 ) leads to downstream of the fuel filter ( 20 ). 3. The fuel injection system according to claim 1 wherein the valve ( 40 ), upon starting of the engine, is put into its first switching position so that the return line ( 38 ) leads to upstream of the fuel filter ( 20 ). 4. The fuel injection system according to claim 2 wherein the valve ( 40 ), upon starting of the engine, is put into its first switching position so that the return line ( 38 ) leads to upstream of the fuel filter ( 20 ). 5. The fuel injection system according to claim 1 wherein the valve ( 40 ) is switched between its two switching positions as a function of at least one operating parameter of the engine. 6. The fuel injection system according to claim 2 wherein the valve ( 40 ) is switched between its two switching positions as a function of at least one operating parameter of the engine. 7. The fuel injection system according to claim 3 wherein the valve ( 40 ) is switched between its two switching positions as a function of at least one operating parameter of the engine. 8. The fuel injection system according to claim 4 wherein the valve ( 40 ) is switched between its two switching positions as a function of at least one operating parameter of the engine. 9. The fuel injection system according to claim 1 further comprising a fuel return line ( 34 ; 36 ) leading from a pressure control valve ( 32 ) of the reservoir ( 24 ) and/or from the high-pressure pump ( 18 ) into the fuel supply container ( 12 ), bypassing the valve ( 40 ). 10. The fuel injection system according to claim 2 further comprising a fuel return line ( 34 ; 36 ) leading from a pressure control valve ( 32 ) of the reservoir ( 24 ) and/or from the high-pressure pump ( 18 ) into the fuel supply container ( 12 ), bypassing the valve ( 40 ). 11. The fuel injection system according to claim 3 further comprising a fuel return line ( 34 ; 36 ) leading from a pressure control valve ( 32 ) of the reservoir ( 24 ) and/or from the high-pressure pump ( 18 ) into the fuel supply container ( 12 ), bypassing the valve ( 40 ). 12. The fuel injection system according to claim 4 further comprising a fuel return line ( 34 ; 36 ) leading from a pressure control valve ( 32 ) of the reservoir ( 24 ) and/or from the high-pressure pump ( 18 ) into the fuel supply container ( 12 ), bypassing the valve ( 40 ). 13. The fuel injection system according to claim 5 further comprising a fuel return line ( 34 ; 36 ) leading from a pressure control valve ( 32 ) of the reservoir ( 24 ) and/or from the high-pressure pump ( 18 ) into the fuel supply container ( 12 ), bypassing the valve ( 40 ). 14. The fuel injection system according to claim 6 further comprising a fuel return line ( 34 ; 36 ) leading from a pressure control valve ( 32 ) of the reservoir ( 24 ) and/or from the high-pressure pump ( 18 ) into the fuel supply container ( 12 ), bypassing the valve ( 40 ). 15. The fuel injection system according to claim 7 further comprising a fuel return line ( 34 ; 36 ) leading from a pressure control valve ( 32 ) of the reservoir ( 24 ) and/or from the high-pressure pump ( 18 ) into the fuel supply container ( 12 ), bypassing the valve ( 40 ). 16. The fuel injection system according to claim 8 further comprising a fuel return line ( 34 ; 36 ) leading from a pressure control valve ( 32 ) of the reservoir ( 24 ) and/or from the high-pressure pump ( 18 ) into the fuel supply container ( 12 ), bypassing the valve ( 40 ).
※ AI-Helper는 부적절한 답변을 할 수 있습니다.