Variable valve actuating apparatus for internal combustion engine, and controller for variable valve actuating apparatus
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02D-013/04
F01L-001/344
F01L-013/00
F02D-013/02
출원번호
US-0418378
(2012-03-13)
등록번호
US-9068483
(2015-06-30)
우선권정보
JP-2011-094705 (2011-04-21)
발명자
/ 주소
Nakamura, Makoto
출원인 / 주소
HITACHI AUTOMOTIVE SYSTEMS, LTD.
대리인 / 주소
Foley & Lardner LLP
인용정보
피인용 횟수 :
1인용 특허 :
4
초록▼
A multi-cylinder internal combustion engine is provided with a variable valve actuating system. At a startup of the engine, a controller performs: causing an initial exhaust valve opening timing of a first combustion cylinder to approach bottom dead center; and setting a second valve overlap period
A multi-cylinder internal combustion engine is provided with a variable valve actuating system. At a startup of the engine, a controller performs: causing an initial exhaust valve opening timing of a first combustion cylinder to approach bottom dead center; and setting a second valve overlap period greater than a first valve overlap period, wherein the first valve overlap period is a period from an initial intake valve opening timing of the first combustion cylinder to an initial exhaust valve closing timing of the first combustion cylinder, and wherein the second valve overlap period is a period from an initial intake valve opening timing of a second combustion cylinder to an initial exhaust valve closing timing of the second combustion cylinder immediately after an initial combustion event of the second combustion cylinder after an initial combustion event of the first combustion cylinder.
대표청구항▼
1. A controller for controlling a variable valve actuating apparatus for a multi-cylinder internal combustion engine, wherein the engine includes at least a first cylinder and a second cylinder, the controller comprising: a section programmed to perform a control process in response to a preconditio
1. A controller for controlling a variable valve actuating apparatus for a multi-cylinder internal combustion engine, wherein the engine includes at least a first cylinder and a second cylinder, the controller comprising: a section programmed to perform a control process in response to a precondition that the first cylinder undergoes an initial combustion event at a startup of the engine earlier than any other cylinder of the engine, the control process including:a first operation of setting an exhaust valve opening timing of the first cylinder to a most retarded position toward bottom dead center, wherein the exhaust valve opening timing is an initial one immediately after the initial combustion event of the first cylinder; anda second operation of setting a second valve overlap period greater than a first valve overlap period, wherein the first valve overlap period is a period from an initial intake valve opening timing of the first cylinder to an initial exhaust valve closing timing of the first cylinder immediately after the initial combustion event of the first cylinder, and wherein the second valve overlap period is a period from an initial intake valve opening timing of the second cylinder to an initial exhaust valve closing timing of the second cylinder immediately after an initial combustion event of the second cylinder after the initial combustion event of the first cylinder. 2. The controller as claimed in claim 1, wherein the second operation includes setting the initial exhaust valve closing timing of the first cylinder a most retarded position toward top dead center. 3. The controller as claimed in claim 2, wherein the second operation includes setting the first valve overlap period to substantially zero or negative. 4. The controller as claimed in claim 1, wherein: the precondition is a condition where the initial combustion event of the second cylinder is immediately subsequent to the initial combustion event of the first cylinder without any other combustion event therebetween; andthe control process includes setting an exhaust valve opening timing of the second cylinder to a most retarded position toward bottom dead center, wherein the exhaust valve opening timing of the second cylinder is an initial one immediately after the initial combustion event of the second cylinder. 5. The controller as claimed in claim 1, wherein: the engine includes a third cylinder;the precondition is a condition where the third cylinder undergoes an initial combustion event earlier than the second cylinder and later than the first cylinder; andthe control process includes setting an exhaust valve opening timing of the third cylinder to a most retarded position toward bottom dead center, wherein the exhaust valve opening timing of the third cylinder is an initial one immediately after the initial combustion event of the third cylinder. 6. The controller as claimed in claim 5, wherein the control process includes a third operation of setting a third valve overlap period greater than the first valve overlap period, wherein the third valve overlap period is a period from an initial intake valve opening timing of the third cylinder to an initial exhaust valve closing timing of the third cylinder immediately after the initial combustion event of the third cylinder. 7. The controller as claimed in claim 4, wherein the control process includes setting a second valve working angle greater than a first valve working angle, wherein the first valve working angle is an angle from the initial exhaust valve opening timing of the first cylinder to the initial exhaust valve closing timing of the first cylinder, and wherein the second valve working angle is a period from the initial exhaust valve opening timing of the second cylinder to the initial exhaust valve closing timing of the second cylinder. 8. The controller as claimed in claim 7, wherein the section is programmed to implement the setting of the second valve working angle by increasing the second valve working angle during a period from the initial exhaust valve opening timing of the second cylinder to the initial exhaust valve closing timing of the second cylinder. 9. The controller as claimed in claim 4, wherein: the engine includes a third cylinder; the precondition is a condition where the third cylinder undergoes an initial combustion event later than the second cylinder; andthe control process includes setting an exhaust valve opening timing of the third cylinder to be advanced from bottom dead center, wherein the exhaust valve opening timing of the third cylinder is an initial one immediately after the initial combustion event of the third cylinder. 10. The controller as claimed in claim 4, wherein: the engine includes a third cylinder; the precondition is a condition where the third cylinder undergoes an initial combustion event later than the second cylinder; andthe control process includes setting a third valve overlap period greater than the second valve overlap period, wherein the third valve overlap period is a period from an initial intake valve opening timing of the third cylinder to an initial exhaust valve closing timing of the third cylinder immediately after the initial combustion event of the third cylinder after the initial combustion event of the second cylinder. 11. The controller as claimed in claim 10, wherein the control process includes setting a third valve working angle greater than a second valve working angle, wherein the second valve working angle is an angle from the initial exhaust valve opening timing of the second cylinder to the initial exhaust valve closing timing of the second cylinder, and wherein the third valve working angle is a period from an initial exhaust valve opening timing of the third cylinder to the initial exhaust valve closing timing of the third cylinder immediately after the initial combustion event of the third cylinder. 12. The controller as claimed in claim 11, wherein the section is programmed to implement the setting of the third valve working angle by increasing the third valve working angle during a period from the initial exhaust valve opening timing of the third cylinder to the initial exhaust valve closing timing of the third cylinder. 13. The controller as claimed in claim 10, wherein: the engine includes a fourth cylinder; the precondition is a condition where the fourth cylinder undergoes an initial combustion event later than the third cylinder; andthe control process includes setting an exhaust valve opening timing of the fourth cylinder to be advanced more than an exhaust valve opening timing of the third cylinder, wherein the exhaust valve opening timing of the third cylinder is an initial one immediately after the initial combustion event of the third cylinder, and wherein the exhaust valve opening timing of the fourth cylinder is an initial one immediately after the initial combustion event of the fourth cylinder. 14. The controller as claimed in claim 13, wherein the control process includes setting a fourth valve working angle greater than a third valve working angle, wherein the third valve working angle is an angle from the initial exhaust valve opening timing of the third cylinder to the initial exhaust valve closing timing of the third cylinder, and wherein the fourth valve working angle is a period from the initial exhaust valve opening timing of the fourth cylinder to an initial exhaust valve closing timing of the fourth cylinder immediately after the initial combustion event of the fourth cylinder. 15. The controller as claimed in claim 14, wherein the section is programmed to implement the setting of the fourth valve working angle by increasing the fourth valve working angle during a period from the initial exhaust valve opening timing of the fourth cylinder to the initial exhaust valve closing timing of the fourth cylinder. 16. The controller as claimed in claim 1, wherein the section is programmed to perform the first operation when the first cylinder of the engine is idle at a predetermined rest position. 17. The controller as claimed in claim 1, wherein the section is programmed to cancel the control process in response to a condition that temperature of the engine is below a predetermined reference value. 18. The controller as claimed in claim 1, wherein the second operation includes changing the first valve overlap period at least by controlling the initial intake valve opening timing of the first cylinder. 19. The controller as claimed in claim 1, wherein the setting of the exhaust valve opening timing of the first cylinder to the most retarded position toward bottom dead center, is set at the bottom dead center. 20. A controller for controlling a variable valve actuating apparatus for a multi-cylinder internal combustion engine, wherein the engine includes at least a first cylinder and a second cylinder, the controller comprising: a section programmed to perform a control process in response to a precondition that the first cylinder undergoes an initial combustion event at a startup of the engine earlier than any other cylinder of the engine, the control process including:a first operation of retarding an exhaust valve opening timing of the first cylinder to a most retarded position toward bottom dead center, wherein the exhaust valve opening timing is an initial one immediately after the initial combustion event; anda second operation of allowing exhaust gas to flow into an intake-side part of the engine, wherein the exhaust gas is produced by an initial combustion event of the second cylinder after the initial combustion event of the first cylinder. 21. The controller as claimed in claim 20, wherein the retarding of the exhaust valve opening timing of the first cylinder to the most retarded position toward bottom dead center, is retarded to the bottom dead center. 22. A variable valve actuating apparatus for a multi-cylinder internal combustion engine, wherein the engine includes at least a first cylinder and a second cylinder, the variable valve actuating apparatus comprising: a section configured to perform a process in response to a precondition that the first cylinder undergoes an initial combustion event at a startup of the engine earlier than any other cylinder of the engine, the process including:a first operation of setting an exhaust valve opening timing of the first cylinder to a most retarded position toward bottom dead center, wherein the exhaust valve opening timing is an initial one immediately after the initial combustion event of the first cylinder; anda second operation of setting a second valve overlap period greater than a first valve overlap period, wherein the first valve overlap period is a period from an initial intake valve opening timing of the first cylinder to an initial exhaust valve closing timing of the first cylinder immediately after the initial combustion event of the first cylinder, and wherein the second valve overlap period is a period from an initial intake valve opening timing of the second cylinder to an initial exhaust valve closing timing of the second cylinder immediately after an initial combustion event of the second cylinder after the initial combustion event of the first cylinder. 23. The variable valve actuating apparatus as claimed in claim 22, wherein the startup of the engine is implemented by injecting fuel directly into a combustion chamber of each cylinder and igniting the injected fuel. 24. The variable valve actuating apparatus as claimed in claim 22, wherein the section is configured to maintain the exhaust valve opening timing of the first cylinder stably close to bottom dead center and maintain the exhaust valve closing timing of the first cylinder stably close to top dead center, when the first cylinder of the engine is idle at a predetermined rest position. 25. The variable valve actuating apparatus as claimed in claim 22, wherein the engine is automatically started and stopped independently of operator's operation. 26. The variable valve actuating apparatus as claimed in claim 22, wherein the section is configured to control characteristics of exhaust valve operation when the first cylinder of the engine is idle at a predetermined rest position. 27. The variable valve actuating apparatus as claimed in claim 22, wherein the setting of the exhaust valve opening timing of the first cylinder to the most retarded position toward bottom dead center, is set at the bottom dead center.
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이 특허에 인용된 특허 (4)
Kobayashi,Tatsuo, Control apparatus and method for four-stroke premixed compression ignition internal combustion engine.
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