IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0485181
(2003-07-11)
|
우선권정보 |
JP-0203204 (2002-07-11) |
국제출원번호 |
PCT//JP03/08855
(2004-01-29)
|
§371/§102 date |
20040129
(20040129)
|
국제공개번호 |
WO20/04/007
(2004-01-22)
|
발명자
/ 주소 |
- Hotta, Yoshihiro
- Wakisaka, Yoshifumi
- Kawamura, Kiyomi
- Nakakita, Kiyomi
|
출원인 / 주소 |
- Toyota Jidosha Kabushiki Kaisha
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
55 인용 특허 :
3 |
초록
▼
In fuel injector including an accumulator and an intensifier, fuel is injected such that an injection control valve and a piston control valve are individually controlled, an operational phase difference therebetween is regulated, and at least one of a maximum injection pressure, a rate of increase
In fuel injector including an accumulator and an intensifier, fuel is injected such that an injection control valve and a piston control valve are individually controlled, an operational phase difference therebetween is regulated, and at least one of a maximum injection pressure, a rate of increase of an injection pressure at the start of an increase of pressure, a rate of decrease of the injection pressure at the completion of injection, a pilot injection pressure, and an after injection pressure of fuel injected from a fuel injection nozzle is arbitrarily changed. Namely, a pressure during a movement from a base common rail pressure of the accumulator to a static maximum pressure statically determined by an operation of the intensifier is positively used as a control factor of injection, whereby a fuel injection pattern can be implemented with an extremely high degree of freedom.
대표청구항
▼
1. A fuel injection method in a fuel injection system, said fuel injection system comprising:a fuel injection nozzle including a fuel reservoir and a needle valve; an accumulator which accumulates fuel at a predetermined pressure; a fuel line through which the fuel reservoir and the accumulator are
1. A fuel injection method in a fuel injection system, said fuel injection system comprising:a fuel injection nozzle including a fuel reservoir and a needle valve; an accumulator which accumulates fuel at a predetermined pressure; a fuel line through which the fuel reservoir and the accumulator are connected; a pressure cutoff valve which is provided along the fuel line, for cutting off fuel pressure flow from the fuel injection nozzle to the accumulator; an injection control fuel chamber which is connected to the fuel line at a downstream side of the pressure cutoff valve; an injection control valve which performs fuel injection by closing the needle valve due to an action of a fuel pressure upon the injection control fuel chamber and by opening the needle valve due to removal of fuel from the injection control fuel chamber; an intensifier which is connected to the fuel injection nozzle and the injection control fuel chamber at a downstream side of the pressure cutoff valve; and intensifier control means which increases a fuel pressure at a downstream side of the pressure cutoff valve by operating the intensifier, said fuel injection method comprising the steps of: suspending operation of the intensifier control means; and performing an after injection of fuel at an intermediate pressure between a predetermined pressure of the accumulator and a static maximum pressure which is statically determined due to operation of the accumulator and the intensifier. 2. The fuel injection method according to claim 1, wherein when an amount in which fuel is injected by the fuel injection nozzle is maximum, a period during which pressure of fuel injected increases is set so as to correspond to ⅓ or more of the entire injection period.3. The fuel injection method according to claim 1, wherein when the intensifier is operated by the intensifier control means, before reaching a static maximum pressure which is statically determined by a geometric intensified pressure ratio of the intensifier and a pressure of the accumulator due to operation of the accumulator and the intensifier, the injection control valve is operated to start fuel injection from the fuel injection nozzle, and a maximum injection pressure of fuel injected from the fuel injection nozzle is set to be equal to or less than the static maximum pressure.4. The fuel injection method according to claim 1, wherein when fuel injection from fuel injection nozzle is suspended by the injection control valve, before the needle valve is completely closed, operation of the intensifier control means is suspended to stop the intensifier, whereby an injection pressure of fuel injected from the fuel injection nozzle is decreased to a predetermined pressure.5. The fuel injection method according to claim 1, wherein an opening speed and a closing speed of the needle valve is set such that the higher the fuel pressures of both the fuel reservoir and the injection control fuel chamber are, the higher the opening speed and the closing speed of the needle valve are.6. The fuel injection method according to claim 1, wherein when a multi-stage injection is performed in which fuel injection from the fuel injection nozzle is carried out a plurality of times per 1 cycle of an engine, the intensifier is operated at least two or more times by the intensifier control means.7. The fuel injection method according to claim 1, wherein the intensifier comprises a cylinder and a piston and wherein fuel is injected by controlling a moving rate of the intensifier piston so as to arbitrarily change at least one of a maximum injection pressure, a rate of increase of the injection pressure at the start of an increase of pressure, a rate of decrease of the injection pressure at the completion of injection, a pilot injection pressure, and an after injection pressure, of fuel injected from the fuel injection nozzle.8. The fuel injection method according to claim 7, wherein the intensifier control means comprises a piston control valve and wherein the fuel injection is performed by individually controlling each of the injection control valve and the piston control valve, and regulating an operational phase difference therebetween.9. The fuel injection method according to claim 7, wherein the moving rate of the intensifier piston is controlled by the piston control valve changing an area of a fuel line into the intensifier cylinder.10. The fuel injection method according to claim 9, wherein the area of the fuel line into the cylinder is changed by the piston control valve during a period when the needle valve is open.11. The fuel injection method according to claim 9, wherein when a multi-stage injection is performed in which fuel injection from the fuel injection nozzle is carried out a plurality of times per 1 cycle of an engine, a maximum area of the fuel line into the cylinder due to the piston control valve is individually set for each injection.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.