Exhaust gas recirculation system with in-cylinder valve actuation
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02M-025/07
F02B-047/08
F02B-047/00
F02B-033/44
출원번호
US-0394120
(2006-03-31)
등록번호
US-7472696
(2009-01-06)
발명자
/ 주소
Easley,William L.
Faletti,James J.
Donaldson,George E.
출원인 / 주소
Caterpillar Inc.
대리인 / 주소
Finnegan, Henderson, Farabow, Garrett & Dunner
인용정보
피인용 횟수 :
9인용 특허 :
13
초록▼
A method for recirculating exhaust gas includes operating an intake valve to open an intake port of a combustion chamber, operating an exhaust valve to open an exhaust port of the combustion chamber, and directing exhaust gas from the exhaust port to an exhaust recirculation port of the combustion c
A method for recirculating exhaust gas includes operating an intake valve to open an intake port of a combustion chamber, operating an exhaust valve to open an exhaust port of the combustion chamber, and directing exhaust gas from the exhaust port to an exhaust recirculation port of the combustion chamber. The method also includes operating an exhaust recirculation valve to open the exhaust recirculation port to allow the exhaust gas to enter the combustion chamber and determining at least one valve actuation condition for controlling actuation of each of the intake valve and the exhaust recirculation valve.
대표청구항▼
What is claimed is: 1. An exhaust recirculation system comprising: a power source including at least one combustion chamber, the at least one combustion chamber including an intake port, an exhaust port, and an exhaust recirculation port; an intake valve configured to open the intake port; an exhau
What is claimed is: 1. An exhaust recirculation system comprising: a power source including at least one combustion chamber, the at least one combustion chamber including an intake port, an exhaust port, and an exhaust recirculation port; an intake valve configured to open the intake port; an exhaust valve configured to open the exhaust port to output exhaust gas from the at least one combustion chamber; an energy extraction device configured to receive the exhaust gas, extract energy from the exhaust gas, and direct the exhaust gas to the exhaust recirculation port; and an exhaust recirculation valve configured to open the exhaust recirculation port to receive the exhaust gas from the energy extraction device. 2. The exhaust recirculation system of claim 1, wherein the energy extraction device is a turbine propelled by the exhaust gas to drive a compressor, and the compressor is configured to receive and compress intake air directed to the intake port. 3. The exhaust recirculation system of claim 1, further including: a first valve actuator for actuating the intake valve; a second valve actuator for actuating the exhaust recirculation valve; a controller configured to determine at least one valve actuation condition of each of the intake valve and the exhaust recirculation valve, the controller being configured to deliver signals to the first and second valve actuators indicative of the respective at least one valve actuation condition of the intake valve an the exhaust recirculation valve. 4. The exhaust recirculation system of claim 1, wherein the power source is an internal combustion diesel engine. 5. The exhaust recirculation system of claim 1,further including: a sensor configured to sense a condition of the exhaust recirculation system; and a controller connected to the intake valve, the exhaust recirculation valve, and the sensor, the controller being configured to determine at least one valve actuation condition for controlling actuation of each of the intake valve and the exhaust recirculation valve. 6. The exhaust recirculation system of claim 5, wherein the sensed condition includes a sensed condition of at least one of the exhaust gas and intake air directed to the intake port. 7. A method for recirculating exhaust gas comprising: operating an intake valve to open an intake port of a combustion chamber during an intake stroke; operating an exhaust valve to open an exhaust port of the combustion chamber to output exhaust gas from the combustion chamber; directing the exhaust gas from the exhaust port to an exhaust recirculation port of the combustion chamber; operating an exhaust recirculation valve to open the exhaust recirculation port during the intake stroke, one of the intake and exhaust recirculation valves being a first actuated valve, the other of the intake and exhaust recirculation valves being a second actuated valve, the second actuated valve beginning to open the port associated with the second actuated valve after the first actuated valve begins closing the port associated with the first actuatedvalve; and using a controller to determine at least one valve actuation condition for controlling actuation of the exhaust recirculation valve. 8. The method of claim 7, wherein the combustion chamber is provided in an internal combustion diesel engine. 9. The method of claim 7, further including: determining at least one valve actuation condition for controlling actuation of the intake valve determining a sensed condition of intake air directed to the intake port; and determining a sensed condition of the exhaust gas, wherein the determining of the at least one valve actuation condition for controlling actuation of the intake and exhaust recirculation valves is based on the sensed conditions of the intake air and the exhaust gas. 10. The method of claim 9, wherein: the sensed conditions are sensed pressures; and the determining of the at least one valve actuation condition includes determining that the exhaust recirculation valve opens before the intake valve if the sensed pressure of the exhaust gas is lower than the sensed pressure of the intake air. 11. A method for recirculating exhaust gas comprising: operating an intake valve to open an intake port of a combustion chamber; operating an exhaust valve to open an exhaust port of the combustion chamber; directing exhaust gas from the exhaust port to an exhaust recirculation port of the combustion chamber; operating an exhaust recirculation valve to open the exhaust recirculation port to allow the exhaust gas to enter the combustion chamber; and determining at least one valve actuation condition for controlling actuation of each of the intake valve and the exhaust recirculation valve. 12. The method of claim 11, wherein the intake and exhaust recirculation valves open the respective ports substantially during an intake stroke, and the exhaust valve opens the exhaust port substantially during an exhaust stroke. 13. The method of claim 11, wherein the at least one valve actuation condition includes valve actuation periods for the intake valve and the exhaust recirculation valve and valve actuation start times for the intake valve and the exhaust recirculation valve. 14. The method of claim 1, further including reducing an amount of particulates in the exhaust gas before directing the exhaust gas to the exhaust recirculation port. 15. The method of claim 11, wherein the combustion chamber is provided in an internal combustion diesel engine. 16. The method for recirculating exhaust gas of claim 11, wherein a substantial portion of the exhaust gas is allowed to enter the combustion chamber through the exhaust recirculation port. 17. The method for recirculating exhaust gas of claim 11, wherein the determining of the at least one valve actuation condition is performed using a controller. 18. The method for recirculating exhaust gas of claim 11, wherein the exhaust recirculation port is configured to allow the exhaust gas to directly enter the combustion chamber. 19. The method of claim 11, wherein one of the intake and exhaust recirculation valves is a first actuated valve, the other of the intake and exhaust recirculation valves is a second actuated valve, the second actuated valve begins opening the port associated with the second actuated valve after the first actuated valve begins closing the port associated with the first actuated valve. 20. The method of claim 19, wherein the second actuated valve begins opening the port associated with the second actuated valve after the first actuated valve has substantially closed the port associated with the first actuated valve. 21. The method of claim 11, further including extracting energy from the exhaust gas before directing the exhaust gas to the exhaust recirculation port. 22. The method of claim 21, further including using the extracted energy to compress intake air directed to the intake port. 23. The method for recirculating exhaust gas of claim 11, wherein the actuation of one of the exhaust recirculation valve and the intake valve is permitted to vary with respect to the actuation of the other of the exhaust recirculation valve and the intake valve. 24. The method for recirculating exhaust gas of claim 23, further including determining an actuation order for the actuation of the exhaust recirculation valve and the intake valve. 25. The method of claim 11,further including: determining a sensed condition of the exhaust gas; and determining a sensed condition of intake air directed to the intake port, the determining of the at least one valve actuation condition being based on the sensed conditions of the intake air and the exhaust gas. 26. The method of claim 25, further including comparing the sensed conditions to determine which one of the intake and exhaust recirculation valves to open first. 27. The method of claim 26, wherein: the sensed conditions are sensed pressures; and the determining of the at least one valve actuation condition includes determining that the exhaust recirculation valve opens before the intake valve if the sensed pressure of the exhaust gas is lower than the sensed pressure of the intake air.
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이 특허에 인용된 특허 (13)
Hamai Kyugo (Yokosuka JPX), Diesel engine having a subchamber.
Deb, Dipankar; Sivasubramaniam, Manthram; Srinivasan, Prashant; Aramanekoppa, Sharath Sridhar; Patchaikani, Prem Kumar; Kulkarni, Sachin Shivajirao; Freund, Sebastian Walter; Fritz, Jassin Marcel; Bikas, Georgios; Yager, James Henry; Kiran, Shashi, Method and systems for exhaust gas control.
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