System for varying cylinder valve timing in an internal combustion engine
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F01L-001/34
F01L-001/344
출원번호
US-0792396
(2013-03-11)
등록번호
US-9115610
(2015-08-25)
발명자
/ 주소
Tewes, Allen
Schmitt, Austin
출원인 / 주소
HUSCO AUTOMOTIVE HOLDINGS LLC
대리인 / 주소
Quarles & Brady LLP
인용정보
피인용 횟수 :
2인용 특허 :
13
초록▼
A variable engine valve timing control system has a cam phase actuator, with first and second actuator ports, to adjust a rotational phase of a camshaft relative to a crankshaft. A first control valve selectively couples the first actuator port to either an engine oil pump or a first valve port. A s
A variable engine valve timing control system has a cam phase actuator, with first and second actuator ports, to adjust a rotational phase of a camshaft relative to a crankshaft. A first control valve selectively couples the first actuator port to either an engine oil pump or a first valve port. A second control valve selectively couples the second actuator port to either the engine oil pump or a second valve port. Separate check valves prevent oil flow backwards through the first and second control valves from the cam phase actuator to the engine oil pump. In one implementation, the first valve port and second valve port are connected to a fluid reservoir. In another implementation, the first valve port is connected by another check valve to the second actuator port, and the second valve port is connected by a further check valve to the first actuator port.
대표청구항▼
1. A control system for varying cylinder valve timing of an internal combustion engine that has a pump, a reservoir, a crankshaft, and a camshaft; said control system comprising: a cam phase actuator for adjusting a rotational phase of the camshaft relative to the crankshaft and having a first actua
1. A control system for varying cylinder valve timing of an internal combustion engine that has a pump, a reservoir, a crankshaft, and a camshaft; said control system comprising: a cam phase actuator for adjusting a rotational phase of the camshaft relative to the crankshaft and having a first actuator port and a second actuator port;a first control valve comprising a first port operatively connected to receive fluid from the pump, a second port in fluid communication with the second actuator port, and a first workport in fluid communication with the first port of the cam phase actuator, the first control valve having a first position in which a first fluid path is provided between the first port and the first workport, and having a second position in which a second fluid path is provided between the second port and the first workport;a second control valve comprising a third port operatively connected to receive fluid from the pump, a fourth port in fluid communication with the first actuator port, and a second workport in fluid communication with the second actuator port, the second control valve having one position in which a third fluid path is provided between the third port and the second workport, and having another position in which a fourth fluid path is provided between the fourth port and the second workport;a first check valve operatively connected to restrict fluid to flow through the first path only in a direction from the pump to the cam phase actuator;a second check valve operatively connected to restrict fluid to flow through the third path only in a direction from the pump to the cam phase actuator;a third check valve operatively connected to restrict fluid to flow only in a direction from the second port to the second actuator port; anda fourth check valve operatively connected to restrict fluid to flow only in a direction from the fourth port to the first actuator port. 2. The control system as recited in claim 1 wherein the second port of the first control valve and the fourth port of the second control valve are in fluid communication with the reservoir. 3. The control system as recited in claim 1 wherein the first control valve and the second control valve are both electrically operated valves. 4. The control system as recited in claim 1 further comprising a first spring biasing the first control valve toward the first position; and a second spring biasing the second control valve toward the one position. 5. The control system as recited in claim 1 wherein the first check valve is integrated into the first control valve; and the second check valve is integrated into the second control valve. 6. A control system for varying cylinder valve timing of an internal combustion engine that has a pump, a reservoir, a crankshaft, and a camshaft; said control system comprising: a cam phase actuator for adjusting a rotational phase of the camshaft relative to the crankshaft and having a first actuator port and a second actuator port;a first control valve comprising a first port operatively connected to receive fluid from the pump, a second port, and a first workport in fluid communication with the first ort of the cam phase actuator, the first control valve being a three-way valve and having a first position in which a first fluid path is provided between the first workport, and the first workport, and having a second position in which a second fluid path is provided between the second port and the first workport;a second control valve comprising a third port operatively connected to receive fluid from the pump, a fourth port in fluid communication with the first actuator port, and a second workport, the second control valve being a three-way valve and having one position in which a third fluid path is provided between the third port and the second workport, and having another position in which a fourth fluid path is provided between the fourth port and the second workport;a first check valve operatively connected to restrict fluid to flow through the first path only in a direction from the pump to the earn phase actuator; anda second check valve operatively connected to restrict fluid to flow through the third path only in a direction from the pump to the cam phase actuator. 7. The control system as recited in claim 6 wherein the first control valve and the second control valve are both electrically operated valves. 8. The control system as recited in claim 6 further comprising a first spring biasing the first control valve toward the first position; and a second spring biasing the second control valve toward the one position. 9. The control system as recited in claim 6 wherein the first check valve is integrated into the first control valve; and the second check valve is integrated into the second control valve. 10. A control system for varying cylinder valve timing of an internal combustion engine that has a pump, a reservoir, a crankshaft, and a camshaft; said control system comprising: a first cam phase actuator for adjusting a rotational phase of the camshaft relative to the crankshaft and having a first actuator port and a second actuator port;a first control valve comprising a first port operatively connected to receive fluid from the pump, a second port in fluid communication with the reservoir, and a first workport in fluid communication with the first actuator port, the first control valve being a three-way valve and having a first position in which a first fluid path is provided between the first port and the first workport, and having a second position in which a second fluid path is provided between the second port and the first workport;a second control valve comprising a third port operatively connected to receive fluid from the pump, a fourth port in fluid communication with the reservoir, and a second workport in fluid communication with the second actuator port, the second control valve being a three-way valve and having one position in which a third fluid path is provided between the third port and the second workport, and having another position in which a fourth fluid path is provided between the fourth port and the second workport;a first check valve operatively connected to restrict fluid to flow through the first path only in a direction from the pump to the first workport; anda second check valve operatively connected to restrict fluid to flow through the third path only in a direction from the pump to the second workport. 11. The control system as recited in claim 10 wherein the first control valve and the second control valve are both electrically operated valves. 12. The control system as recited in claim 10 further comprising a first spring biasing the first control valve toward the first position; and a second spring biasing the second control valve toward the one position. 13. The control system as recited in claim 10 wherein the first check valve is integrated into the first control valve; and the second check valve is integrated into the second control valve. 14. A control system for varying cylinder valve timing of an internal combustion engine that has a pump, a reservoir, a crankshaft, and a camshaft; said control system comprising: a first cam phase actuator for adjusting a rotational phase of the camshaft relative to the crankshaft and having a first actuator port and a second actuator port;a first control valve comprising a first port operatively connected to receive fluid from the pump, a second port in fluid communication with the reservoir, and a first workport in fluid communication with the first actuator port, the first control valve having a first position in which a first fluid path is provided between the first port and the first workport, and having a second position in which a second fluid path is provided between the second port and the first workport;a second control valve comprising a third port operatively connected to receive fluid from the pump, a fourth port in fluid communication with the reservoir, and a second workport in fluid communication with the second actuator port, the second control valve having one position in which a third fluid path is provided between the third port and the second workport, and having another position in which a fourth fluid path is provided between the fourth port and the second workport;a first check valve operatively connected to restrict fluid to flow through the first path only in a direction from the pump to the first workport;a second check valve operatively connected to restrict fluid to flow through the third path only in a direction from the pump to the second workport; anda second cam phase actuator having one actuator port in fluid communication with the first workport and another port in fluid communication with the second workport, wherein phasing of the first cam phase actuator is varied during a first range of angles during rotation of the cam shaft and phasing of the second cam phase actuator is varied during a second range of angles during rotation of the cam shaft. 15. The control system as recited in claim 14 wherein the first control valve and the second control valve are both electrically operated valves. 16. The control system as recited in claim 14 further comprising a first spring biasing the first control valve toward the first position; and a second spring biasing the second control valve toward the one position. 17. The control system as recited in claim 14 wherein the first check valve is integrated into the first control valve; and the second check valve is integrated into the second control valve. 18. A control system for varying cylinder valve timing of an internal combustion engine that has a pump, a reservoir, a crankshaft, and a camshaft; said control system comprising: a first cam phase actuator for adjusting a rotational phase of the camshaft relative to the crankshaft and having a first actuator port and a second actuator port;a first control valve comprising a first port operatively connected to receive fluid from the pump, a second port, and a first workport in fluid communication with the first port of the first cam phase actuator, the first control valve having a first position in which a first fluid path is provided between the first port and the first workport, and having a second position in which a second fluid path is provided between the second port and the first workport;a second control valve comprising a third port operatively connected to receive fluid from the pump, a fourth port, and a second workport in fluid communication with the second actuator port of the first cam phase actuator, the second control valve having one position in which a third fluid path is provided between the third port and the second workport, and having another position in which a fourth fluid path is provided between the fourth port and the second workport;a first check valve operatively connected to restrict fluid to flow through the first path of the first control valve only in a direction from the pump to the first workport;a second check valve operatively connected to restrict fluid to flow through the third path of the second control valve only in a direction from the pump to the second workport; anda third check valve providing a path for fluid to flow in a direction only from the second port of the first control valve to the second actuator port. 19. The control system as recited in claim 18 wherein the fourth port of the second control valve is in fluid communication with the reservoir. 20. The control system as recited in claim 18 further comprising a fourth check valve providing a path for fluid to flow in a direction only from the fourth port of the second control valve to the first actuator port. 21. The control system as recited in claim 18 wherein the first control valve and the second control valve are both three-way valves. 22. The control system as recited in claim 18 wherein the first control valve and the second control valve are both electrically operated valves. 23. The control system as recited in claim 18 further comprising a first spring biasing the first control valve toward the first position; and a second spring biasing the second control valve toward the one position. 24. The control system as recited in claim 18 wherein the first check valve is integrated into the first control valve; and the second check valve is integrated into the second control valve. 25. The control system as recited in claim 18 further comprising a second cam phase actuator having one actuator port in fluid communication with the first workport and another actuator port in fluid communication with the second workport, wherein phasing of the first cam phase actuator is varied during a first range of angles during rotation of the cam shaft and phasing of the second cam phase actuator is varied during a second range of angles during rotation of the cam shaft.
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이 특허에 인용된 특허 (13)
Schafer Jens,DEX ; Reuter Bernd,DEX ; Scheidt Martin,DEX ; Heintzen Dirk,DEX, Arrangement for controlling a device for changing the valve timing of an internal combustion engine.
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