Crankcase ventilation via crankcase pulsation
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02B-025/06
F01M-013/02
출원번호
US-0621711
(2012-09-17)
등록번호
US-9593605
(2017-03-14)
발명자
/ 주소
Ulrey, Joseph Norman
Pursifull, Ross Dykstra
출원인 / 주소
Ford Global Technologies, LLC
대리인 / 주소
Voutyras, Julia
인용정보
피인용 횟수 :
0인용 특허 :
21
초록▼
Systems and methods for ventilating crankcase gases in a crankcase ventilation system via crankcase pressure pulsations are disclosed. In one example approach, a method comprises driving flow of crankcase ventilation gases through a crankcase of the engine from a fresh air inlet of the crankcase to
Systems and methods for ventilating crankcase gases in a crankcase ventilation system via crankcase pressure pulsations are disclosed. In one example approach, a method comprises driving flow of crankcase ventilation gases through a crankcase of the engine from a fresh air inlet of the crankcase to an outlet of the crankcase via crankcase pressure pulsations while restricting backflow of crankcase ventilation gases from the outlet to the inlet, where the inlet and outlet are coupled upstream of an intake throttle of the engine.
대표청구항▼
1. A method, comprising: driving crankcase ventilation gas flow through an engine crankcase from a crankcase fresh air inlet to a crankcase fresh air outlet and then to an engine intake upstream of a turbocharger compressor via crankcase pressure pulsations, while restricting crankcase ventilation g
1. A method, comprising: driving crankcase ventilation gas flow through an engine crankcase from a crankcase fresh air inlet to a crankcase fresh air outlet and then to an engine intake upstream of a turbocharger compressor via crankcase pressure pulsations, while restricting crankcase ventilation gas backflow from the outlet to the inlet via a unidirectional check valve, the inlet coupled to the engine intake upstream of the turbocharger compressor, the compressor arranged upstream of a throttle, the inlet further coupled to a pulsation-restricted zone of the crankcase, and the outlet coupled to the engine intake via only a single conduit, and the single conduit couples the outlet to the engine intake upstream of the turbocharger compressor, the outlet further coupled to a pulsation zone of the crankcase, and the unidirectional check valve disposed in the outlet upstream of the single conduit. 2. The method of claim 1, further comprising separating oil from the ventilation gases at the outlet and not separating oil from the ventilation gases at the inlet. 3. The method of claim 1, further comprising, in response to a pressure above a threshold, limiting an amount of crankcase ventilation gas flow through an oil separator disposed in the outlet downstream of the unidirectional check valve. 4. The method of claim 1, wherein a pressure difference between the pulsation-restricted zone and the pulsation zone drives the crankcase ventilation gas flow through the crankcase from the inlet to the outlet. 5. The method of claim 1, wherein the pulsation-restricted zone is a region of the crankcase between a cylinder valve cover and combustion chamber walls of an engine cylinder, and wherein the pulsation zone is a region of the crankcase between an oil well and a crank. 6. The method of claim 1, further comprising restricting communication between first and second engine cylinders via a restriction element partially separating the first and second cylinders in the crankcase, wherein ventilation gases flow through the second cylinder while being driven by pressure pulsations generated by the first cylinder. 7. An engine crankcase ventilation system comprising: a crankcase fresh air inlet coupled to an engine air intake upstream of an engine throttle and to a pulsation-restricted zone of a crankcase;a crankcase outlet coupled to the air intake via only a single conduit, and the single conduit couples the outlet to the air intake upstream of the throttle, the outlet further coupled to a pulsation zone of the crankcase;a restriction element partially separating first and second engine cylinders in the crankcase and having an opening; anda unidirectional check valve disposed in the outlet upstream of the single conduit,wherein the system is configured to drive crankcase ventilation gases from the inlet to the outlet and then to the air intake upstream of the throttle via pressure pulsations within the crankcase. 8. The system of claim 7, further comprising only a single oil separator coupled to the outlet downstream of the unidirectional check valve, the oil separator coupled to an oil drain line having a pressure regulator disposed therein, the oil drain line further coupled to the crankcase, where there are no other oil separators in the system. 9. The system of claim 8, wherein the pressure regulator is an oil liquid column pressure regulator. 10. The system of claim 7, wherein the engine includes a turbocharger and the inlet and outlet are coupled to the air intake upstream of a compressor of the turbocharger. 11. The system of claim 7, wherein the unidirectional check valve directs the flow of crankcase ventilation gases driven by crankcase pressure pulsations through the crankcase from the inlet to the outlet and restricts backflow of crankcase ventilation gases from the outlet to the inlet. 12. The system of claim 7, wherein communication between the first and second cylinders of the engine is at least partially restricted in the crankcase by the restriction element. 13. The system of claim 7, wherein the restriction element is configured to increase a driving force generated by movement of a piston of the first cylinder and wherein the opening in the restriction element is configured to permit a restricted fluid communication between the first and second cylinders. 14. A crankcase ventilation system for an engine with a crankcase comprising: a crankcase fresh air inlet at a pulsation-restricted region of the crankcase at least partially isolated from a crank of the crankcase and coupled to an air intake of the engine upstream of a throttle of the engine;a crankcase outlet at a pulsation region of the crankcase adjacent to the crank and coupled to the air intake via only a single conduit, and the single conduit couples the outlet to the air intake upstream of the throttle of the engine;a rigid wall partially separating first and second cylinders of the engine in the crankcase and having an opening; anda unidirectional check valve disposed in the outlet upstream of the single conduit,wherein the system is configured to drive crankcase ventilation gases from the inlet to the outlet and then to the air intake upstream of the throttle via pressure pulsations within the crankcase. 15. The system of claim 14, further comprising only a single oil separator coupled to the outlet downstream of the unidirectional check valve and no oil separator coupled to the inlet, and an oil drain line coupled to the oil separator and the crankcase. 16. The system of claim 15, further comprising a pressure regulator coupled to the single oil separator and oil drain line. 17. The system of claim 14, wherein the unidirectional check valve directs flow of crankcase ventilation gases driven by crankcase pressure pulsations through the crankcase from the inlet to the outlet and restricts backflow of crankcase ventilation gases from the outlet to the inlet. 18. The system of claim 14, wherein communication between the first and second cylinders of the engine is at least partially restricted in the crankcase by the rigid wall. 19. The system of claim 14, wherein the rigid wall is configured to increase a driving force generated by movement of a piston of the first cylinder and wherein the opening in the rigid wall is configured to permit a restricted fluid communication between the first and second cylinders.
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이 특허에 인용된 특허 (21)
Megas Lucas,SEX, Arrangement for ventilation of crankcase gases in an internal-combustion engine.
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