IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0472139
(2002-03-20)
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우선권정보 |
DE-0014252 (2001-03-22) |
국제출원번호 |
PCT/EP02/03053
(2002-03-20)
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국제공개번호 |
WO02/07744
(2002-10-03)
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발명자
/ 주소 |
- Schmidt, Guenther
- Kloos, Albert
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
1 인용 특허 :
5 |
초록
▼
A method and a system are provided for injecting fuel into the combustion spaces of an internal-combustion engine, in which case the injection system contains a number of fuel injectors each comprising an injection valve and a common feed and storage line supplying the individual fuel injectors with
A method and a system are provided for injecting fuel into the combustion spaces of an internal-combustion engine, in which case the injection system contains a number of fuel injectors each comprising an injection valve and a common feed and storage line supplying the individual fuel injectors with highly pressurized fuel. The beginning and the end of the injection of the fuel into the combustion chamber are controlled by opening and closing the injection valve. A defined lowering of the fuel pressure existing in the fuel injector takes place during the injection, so that the pressure which rises because of the ram pressure during the closing of the injection valve at the end of the injection in the fuel injector does not exceed a defined value, particularly preferably the system pressure of the fuel injection system.
대표청구항
▼
1. Method of injecting fuel into the combustion chambers of an internal-combustion engine, including a diesel engine, by means of a fuel injection system which contains a number of fuel injectors each comprising an injection valve and a common feed and storage line which supplies the individual fuel
1. Method of injecting fuel into the combustion chambers of an internal-combustion engine, including a diesel engine, by means of a fuel injection system which contains a number of fuel injectors each comprising an injection valve and a common feed and storage line which supplies the individual fuel injectors by way of respective high-pressure lines with highly pressurized fuel and itself is acted upon by highly pressurized fuel by way of a high-pressure pump, the feeding of the fuel taking place from the storage line by way of one or more high-pressure reservoirs, and the beginning and end of the injection of the fuel into the combustion chambers being controlled by opening and closing the injection valves of the fuel injectors,said method comprising:limiting continued flow of the fuel during injection, such that a defined lowering of the fuel pressure existing in a fuel injector takes place from an initial pressure p 1 , which is slightly lower than a system pressure, to a second pressure p 2 at a second point in time T 2 when closing of a fuel injection valve starts, so that such pressure which rises because of ram pressure during the closing of the injection valve at the end of the injection in the fuel injector does not exceed a defined value. 2. Method according to claim 1, wherein the defined lowering of the fuel pressure in the fuel injector takes place such that the pressure which rises because of the ram pressure during the closing of the injection valve at the end of the injection in the fuel injector, does not exceed the system pressure existing in the fuel injector at the beginning of the injection. 3. Method according to claim 1, wherein feeding of the fuel from the common feed and storage line to the fuel injectors is through two high-pressure reservoirs provided in each of the high-pressure lines leading to the fuel injectors and having a defined fuel storage volume, and wherein the defined lowering of the fuel pressure existing in the fuel injector takes place by limiting the continued flow of the fuel in the high-pressure lines leading from the common feed and storage line to the high-pressure reservoirs. 4. Method according to claim 2, wherein feeding of the fuel from the common feed and storage line to the fuel injectors is through two high-pressure reservoirs provided in each of the high-pressure lines leading to the fuel injectors and having a defined fuel storage volume, and wherein the defined lowering of the fuel pressure existing in the fuel injector takes place by limiting the continued flow of the fuel in the high-pressure lines leading from the common feed and storage line to the high-pressure reservoirs. 5. Method according to claim 1, wherein feeding of the fuel from the common feed and storage line is through at least one high pressure reservoir provided in each respective high-pressure line leading to the respective fuel injector and having a defined storage volume, and wherein the defined lowering of the fuel pressure existing in the fuel injector takes place by limiting the continued flow of the fuel in the high-pressure lines leading from the common feed and storage line to the respective at least one high-pressure reservoir. 6. Method according to claim 3, wherein the high-pressure reservoir situated closer to the injector has a smaller volume than the high-pressure reservoir situated farther upstream. 7. Method according to claim 4, wherein the high-pressure reservoir situated closer to the injector has a smaller volume than the high-pressure reservoir situated farther upstream. 8. Method according to claim 3, wherein a quantity-limiting valve is assigned to at least one of the high-pressure reservoirs, which quantity-limiting valve is in each case situated downstream of the high-pressure reservoir. 9. Method according to claim 4, wherein a quantity-limiting valve is assigned to at least one of the high-pressure reservoirs, which quantity-limiting valve is in each case situated downstre am of the high-pressure reservoir. 10. Method according to claim 5, wherein a quantity limiting valve is disposed downstream of each of said at least one high-pressure reservoirs. 11. Method according to claim 3, wherein the limiting of the continued flow of the fuel takes place by means of throttling points provided in the high-pressure lines leading from the common feed and storage line to the high-pressure reservoirs. 12. Method according to claim 4, wherein the limiting of the continued flow of the fuel takes place by means of throttling points provided in the high-pressure lines leading from the common feed and storage line to the high-pressure reservoirs. 13. Method according to claim 5, wherein the limiting of the continued flow of the fuel takes place by means of throttling points provided in the high-pressure lines leading from the common feed and storage line to each of the at least one high-pressure reservoirs. 14. Method according to claim 6, wherein the limiting of the continued flow of the fuel takes place by means of throttling points provided in the high-pressure lines leading from the common feed and storage line to the high-pressure reservoirs. 15. Method according to claim 8, wherein the limiting of the continued flow of the fuel takes place by means of throttling points provided in the high-pressure lines leading from the common feed and storage line to the high-pressure reservoirs. 16. Method according to claim 3, wherein the limiting of the continued flow of the fuel takes place by the dimensioning of the diameter of the high-pressure lines leading from the common feed and storage line to the high-pressure reservoirs. 17. Method according to claim 4, wherein the limiting of the continued flow of the fuel takes place by the dimensioning of the diameter of the high-pressure lines leading from the common feed and storage line to the high-pressure reservoirs. 18. Method according to claim 5, wherein the limiting of the continued flow of the fuel takes place by the dimensioning of the diameter of the high-pressure lines leading from the common feed and storage line to each of the at least one high-pressure reservoirs. 19. Method according to claim 6, wherein the limiting of the continued flow of the fuel takes place by the dimensioning of the diameter of the high-pressure lines leading from the common feed and storage line to the high-pressure reservoirs. 20. Method according to claim 11, wherein the limiting of the continued flow of the fuel takes place by the dimensioning of the diameter of the high-pressure lines leading from the common feed and storage line to the high-pressure reservoirs. 21. Fuel injection system for an internal-combustion engine, including a diesel engine, which contains a number of fuel injectors each comprising an injection valve and a common feed and storage line which supplies the individual fuel injectors with highly pressurized fuel and itself is acted upon by highly pressurized fuel by way of a high-pressure pump, as well as two high-pressure reservoirs which are, in each case, provided in the high-pressure lines leading to the fuel injectors and have a defined fuel storage volume, the beginning and end of the injection of the fuel into the combustion chambers being controlled by opening and closing the injection valves of the fuel injectors,wherein the fuel storage volume of the high-pressure reservoirs and the flow resistance of the high-pressure lines leading from the common feed and storage line to the high-pressure reservoirs, while taking into account the maximal injection quantity and duration, are dimensioned such that, during the injection, a lowering of the fuel pressure existing in the fuel injector takes place from an initial pressure p 1 , which is slightly lower than the system pressure, to a fuel pressure p 2 at a second point in time when the closing of the injection valve starts, so that the pressure, which rises as a result of the ram pressure during the closin g of the injection valve at the end of the injection in the fuel injector, does not exceed a defined value. 22. Fuel injection system according to claim 21, wherein the fuel storage volume of the high-pressure reservoirs and the flow resistance of the high-pressure line leading from the common feed and storage line to the high-pressure reservoirs is dimensioned such that the pressure which rises because of the ram pressure during the closing of the injection valve at the end of the injection in the fuel injector does not exceed the system pressure P 0 existing at the beginning of the injection in the fuel injector. 23. Fuel injection system according to claim 21, wherein in the case of an arrangement with, in each case, two high-pressure reservoirs, the high-pressure reservoir situated closer to the injector has a smaller volume than the second high-pressure reservoir situated upstream. 24. Fuel injection system according to claim 22, wherein in the case of an arrangement with, in each case, two high-pressure reservoirs, the high-pressure reservoir situated closer to the injector has a smaller volume than the second high-pressure reservoir situated upstream. 25. Fuel injection system according to claim 21, wherein a quantity-limiting valve is assigned to at least one of the high-pressure reservoirs, which quantity-limiting valve is in each case situated downstream of the respective high-pressure reservoir. 26. Fuel injection system according to claim 22, wherein a quantity-limiting valve is assigned to at least one of the high-pressure reservoirs, which quantity-limiting valve is in each case situated downstream of the respective high-pressure reservoir. 27. Fuel injection system according to claim 23, wherein a quantity-limiting valve is assigned to at least one of the high-pressure reservoirs, which quantity-limiting valve is in each case situated downstream of the respective high-pressure reservoir. 28. Fuel injection system according to claim 21, wherein the flow resistance of the high-pressure lines leading from the common feed and storage line to the high-pressure reservoirs is determined by throttling points. 29. Fuel injection system according to claim 22, wherein the flow resistance of the high-pressure lines leading from the common feed and storage line to the high-pressure reservoirs is determined by throttling points. 30. Fuel injection system according to claim 23, wherein the flow resistance of the high-pressure lines leading from the common feed and storage line to the high-pressure reservoirs is determined by throttling points. 31. Fuel injection system according to claim 25, wherein the flow resistance of the high-pressure lines leading from the common feed and storage line to the high-pressure reservoirs is determined by throttling points. 32. Fuel injection system according to claim 21, wherein the flow resistance of the high-pressure lines leading from the common feed and storage line to the high-pressure reservoirs is determined by their diameter. 33. Fuel injection system according to claim 22, wherein the flow resistance of the high-pressure lines leading from the common feed and storage line to the high-pressure reservoirs is determined by their diameter. 34. Fuel injection system according to claim 23, wherein the flow resistance of the high-pressure lines leading from the common feed and storage line to the high-pressure reservoirs is determined by their diameter. 35. Fuel injection system according to claim 25, wherein the flow resistance of the high-pressure lines leading from the common feed and storage line to the high-pressure reservoirs is determined by their diameter. 36. A fuel injection system assembly for an internal combustion engine comprising:a plurality of fuel injection valves,a common feed line operable to supply highly pressurized fuel at a system pressure, andhigh pressure lines leading from the common feed line to respective ones of the fuel injection valves,wherein the fuel storag e volume and flow resistance of the system intermediate the common feed line and the fuel injection valves are configured such that, during injection, a lowering of the fuel pressure in the fuel injector from an initial pressure which is slightly lower than the system pressure to a second fuel pressure at a later point in time when closing of the injector valve starts, such that the injector valve pressure which rises as a result of ram pressure during the closing of the injection valve at the end of injection does not exceed a predetermined value. 37. A fuel injection system assembly according claim 36, wherein said predetermined value does not exceed the system pressure existing at initiation of injection in the fuel injector. 38. A fuel injection system assembly according to claim 36, wherein the system intermediate the feed line and respective fuel injection valves includes high pressure reservoir means. 39. A fuel injection system assembly according to claim 38, wherein the high pressure reservoir means includes two high pressure reservoirs in series in each high pressure line leading to a respective fuel injection valve. 40. A fuel injection system assembly according to claim 39, wherein the high pressure reservoirs have different volumes with the one closest to the injection valve having a smaller volume than the one upstream thereof. 41. A fuel injection system assembly according to claim 40, comprising quantity limiting valves in the high pressure lines. 42. A method of supplying fuel to an internal combustion engine using a fuel injection system assembly comprising:a plurality of fuel injection valves,a common feed line operable to supply highly pressurized fuel at a system pressure, andhigh pressure lines leading from the common feed line to respective ones of the fuel injection valves,said method comprisingcontrolling the fuel pressure at the injection valves such that during injection, a lowering of the fuel pressure in the fuel injector from an initial pressure which is slightly lower than the system pressure to a second fuel pressure at a later point in time when closing of the injector valve starts, such that the injector valve pressure which rises as a result of ram pressure during the closing of the injection valve at the end of injection does not exceed a predetermined value. 43. A method according to claim 42, wherein said predetermined value does not exceed the system pressure existing at initiation of injection in the fuel injector. 44. A method according to claim 42, wherein the system intermediate the feed line and respective fuel injection valves includes high pressure reservoir means. 45. A method according to claim 44, wherein the high pressure reservoir means includes two high pressure reservoirs in series in each high pressure line leading to a respective fuel injection valve. 46. A method according to claim 45, wherein the high pressure reservoirs have different volumes with the one closest to the injection valve having a smaller volume than the one upstream thereof. 47. A method according to claim 46, comprising quantity limiting valves in the high pressure lines.
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