IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0805626
(2004-03-19)
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발명자
/ 주소 |
- Gibson,Alex
- Kolmanovsky,Ilya V.
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출원인 / 주소 |
- Ford Global Technologies, LLC
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대리인 / 주소 |
Allenman Hall McCoy Russell &
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인용정보 |
피인용 횟수 :
70 인용 특허 :
128 |
초록
A system and method to control engine valve timing to improve air-fuel control in an engine with valves that may be deactivated. Valves that may be deactivated are controlled in a manner to improve detection of individual cylinder air-fuel ratios.
대표청구항
▼
The invention claimed is: 1. A method control air-fuel ratios in individual cylinders of an internal combustion engine with electrically actuated valves, where each electrically actuated intake or exhaust valve is actuated directly by an electromagnetic actuator, the method comprising: operating at
The invention claimed is: 1. A method control air-fuel ratios in individual cylinders of an internal combustion engine with electrically actuated valves, where each electrically actuated intake or exhaust valve is actuated directly by an electromagnetic actuator, the method comprising: operating at least an electrically actuated intake or exhaust valve in each cylinder combusting an air-fuel mixture during a cycle of said engine; and correcting an air and fuel mixture supplied to each cylinder combusting an air-fuel mixture by adjusting electrically actuated valve timing for said each cylinder based on a desired air-fuel mixture in said each cylinder combusting an air-fuel mixture. 2. The method of claim 1 wherein said correction of an air and fuel mixture is produced by adjusting an amount of fuel injected into said each cylinder combusting an air-fuel mixture. 3. The method of claim 1 wherein said desired air-fuel mixture in said each cylinder is the same desired air-fuel ratio in each cylinder. 4. The method of claim 1 wherein said desired air-fuel mixture in said each cylinder is a different desired air-fuel ratio in each cylinder. 5. The method of claim 1 wherein said desired air-fuel mixture in said each cylinder is based on a cylinder bank or said engine. 6. A method for adjusting air-fuel ratio in internal combustion engine, the engine having at least a group of cylinders, with each cylinder of said cylinder group containing at least a valve that may be deactivated, the method comprising: adjusting timing of said at least a valve that may be deactivated for at least a cylinder of said cylinder group, increasing a crank angle interval between combustion in at least a first cylinder and combustion in at least a second cylinder, for at least said group; and correcting an air and fuel mixture supplied to said at least a second cylinder, based on a desired air-fuel mixture in said second cylinder, wherein said adjusting timing of said at least a valve that may be deactivated for at least a cylinder of said cylinder group increases the number of strokes in cycle of said cylinder. 7. The method of claim 6 wherein said engine includes a first and a second bank of cylinders. 8. The method of claim 6 wherein said adjusting timing of said at least a valve that may be deactivated for at least a cylinder of said cylinder group deactivates said cylinder. 9. The method of claim 6 wherein said valve that may be deactivated is an electrically actuated valve. 10. The method of claim 6 wherein said valve that may be deactivated is a mechanically driven valve. 11. The method of claim 6, wherein said correction of an air and fuel mixture supplied to said at least a second cylinder is produced by adjusting at least an electrically actuated valve timing for said at least a second cylinder. 12. The method of claim 6 wherein said correction of an air and fuel mixture is produced by adjusting an amount of fuel injected into to said at least a second cylinder. 13. A method to control air-fuel ratio in a cylinder of an internal combustion engine with electrically actuated valves, where each electrically actuated intake or exhaust valve is actuated directly by an electromagnetic actuator, the method comprising: operating said internal combustion engine with at least one cylinder, said at least one cylinder having at least one electrically actuated valve; sampling at least an oxygen sensor positioned in the exhaust of said internal combustion engine, downstream of said at least one cylinder having at least one electrically actuated valve, at least once each period associated with each combustion event of said at least on cylinder having at least on electrically actuated valve; generating a feedback correction signal associated with each combustion event of said at least one cylinder having at least one electrically actuated valve, from said at least a sampled oxygen sensor; and correcting at least a mixture of air and fuel supplied to said at least one cylinder, in response to said feedback correction signal associated with each combustion event of said at least one cylinder having at least one electrically actuated valve, for achieving a desired air-fuel ratio in said at least one cylinder, wherein said corrected mixture of air and fuel is produced by adjusting timing of said at least one electrically actuated valve. 14. The method of claim 13 wherein said corrected mixture of air and fuel is produced by adjusting an amount of fuel injected into said cylinder. 15. The method of claim 13 wherein a sampling location of said sampling of said oxygen sensor is based on at least a cylinder and valve mode of said at least one cylinder having at least one electrically actuated valve. 16. A method for adjusting air-fuel ratio in internal combustion engine, the engine having at least a group of cylinders, with each cylinder of said cylinder group containing at least an electrically actuated exhaust valve, the method comprising: adjusting said at least an electrically actuated exhaust valve timing based at least on an engine operating condition; sampling at least a signal of at least an oxygen sensor positioned in the exhaust of said at least a group of cylinders, at least once each period associated with a combustion event of said each cylinder of said cylinder group containing at least an electrically actuated exhaust valve; generating at least a feedback correction signal from said sampled oxygen sensor signal for each cylinder of said cylinder group containing at least an electrically actuated exhaust valve; and correcting a mixture of air and fuel supplied to said each cylinder of said cylinder group containing at least an electrically actuated exhaust valve, in response to said at least a feedback correction signal from sampled oxygen sensor signal for each cylinder of said cylinder group containing at least an electrically actuated exhaust valve, for achieving a desired air-fuel ratio in said each cylinder of said cylinder group containing at least an electrically actuated exhaust valve, wherein said corrected mixture of air and fuel supplied to said each cylinder of said cylinder group containing at least an electrically actuated exhaust valve is produced by adjusting timing of said electrically actuated valves. 17. The method of claim 16 wherein said adjusted exhaust valve timing is retarded. 18. The method of claim 16 wherein said adjusted exhaust valve timing is advanced. 19. The method of claim 16 wherein said corrected mixture of air and fuel to produced by adjusting an amount of fuel injected into said cylinder. 20. The method of claim 16 wherein a sampling location of said sampling of said oxygen sensor is based on at least a cylinder and valve mode of said cylinder. 21. The method of claim 16 wherein said corrected mixture of air and fuel is corrected by adjusting timing of said at least an electrically actuated valve. 22. The method of claim 16 wherein said corrected mixture of air and fuel is corrected by adjusting an amount of fuel injected into said cylinder. 23. A method for adjusting air-fuel ratio internal combustion engine, the engine having at least a first and a second group of cylinders, with each cylinder of said first cylinder group and said second cylinder group containing at least an electrically actuated valve, the method comprising: in a first mode, adjusting timing of said at least an electrically actuated valve for at least a cylinder of said first cylinder group, increasing a crank angle interval between combustion in at least a first cylinder and combustion in at least a second cylinder, for at least a bank of said engine; correcting an air and fuel mixture supplied to said at least a second cylinder, based on a desired air-fuel mixture in said second cylinder; in a second mode, adjusting timing of said at least an electrically actuated valve for at least a cylinder of said second cylinder group, increasing a crank angle interval between combustion in at least a third cylinder and combustion in at least a forth cylinder, for at least a bank of said engine; and correcting an air and fuel mixture supplied to said at least a forth cylinder, based on a desired air-fuel mixture in said forth cylinder, wherein said adjusting timing of said at least an electrically actuated valve for at least a cylinder of said first cylinder group deactivates said at least a cylinder of said first cylinder group. 24. The method of claim 23 wherein said engine includes a first and a second bank of cylinders. 25. The method of claim 23 wherein said adjusting timing of said at least an electrically actuated valve for at least a cylinder of said first cylinder group increases the number of strokes in a cycle of said at least a cylinder of said first cylinder group. 26. The method of claim 23 wherein said adjusting timing of said at least an electrically actuated valve for at least a cylinder of said second cylinder group increases the number of strokes in a cycle of said at least a cylinder of said second cylinder group. 27. The method of claim 23 wherein said adjusting timing of said at least an electrically actuated valve for at least a cylinder of said second cylinder group deactivates said at least a cylinder of said second cylinder group. 28. A system for adjusting air-fuel in an internal combustion engine with electrically actuated valves, the system comprising: an internal combustion engine having at least an electrically actuated valve in each cylinder; at least an oxygen sensor located in an exhaust passage downstream of said each cylinder; a controller for operating at least an electrically actuated valve in each cylinder combusting an air-fuel mixture during a cycle of said cylinder; and correcting an air and fuel mixture supplied to said each cylinder combusting an air-fuel mixture, based on a desired air-fuel mixture in said each cylinder combusting an air-fuel mixture. 29. A computer readable storage medium having stored data representing instructions executable by a computer to control an internal combustion engine of a vehicle, said storage medium comprising: instructions for operating at least an electrically actuated valve, where each electrically actuated valve is actuated directly by an electromagnetic actuator, in each cylinder combusting an air-fuel mixture during a cycle of said engine; and instructions for correcting an air and fuel mixture supplied to said each cylinder combusting an air-fuel mixture, based on a desired air-fuel mixture in said each cylinder combusting an air-fuel mixture.
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