Enhanced fuel injection based on choke flow rate
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02M-021/02
F02M-037/00
F02M-043/00
F02M-043/04
F02M-069/54
출원번호
US-0866721
(2013-04-19)
등록번호
US-9528472
(2016-12-27)
발명자
/ 주소
Pursifull, Ross Dykstra
Guido, Samuel
Badillo, Ed
Saberwal, Dev
출원인 / 주소
Ford Global Technologies, LLC
대리인 / 주소
Voutyras, Julia
인용정보
피인용 횟수 :
0인용 특허 :
17
초록▼
A method is described for adjusting the amount of gaseous fuel injected based on the sonic choked flow rate through a restriction. Because the sonic choke flow rate continues to decrease as tank pressure decreases, the method includes computing the sonic choke flow rate through the restriction based
A method is described for adjusting the amount of gaseous fuel injected based on the sonic choked flow rate through a restriction. Because the sonic choke flow rate continues to decrease as tank pressure decreases, the method includes computing the sonic choke flow rate through the restriction based on system variables and enforcing the rate of CNG injection to be less than the sonic choke flow rate through the restriction. Thereby, the mass flow rate to the fuel injector can be substantially maximized to substantially minimize the time for fuel tank emptying, particularly during the last amount of tank emptying when the contents of the gaseous storage tank is low.
대표청구항▼
1. A method for operating an engine while emptying a gaseous fuel tank, comprising: coupling a gaseous fuel from the tank to a fuel injector through a restriction; andwith a controller, determining a choked sonic mass flow rate of the gaseous fuel through the restriction and controlling a mass flow
1. A method for operating an engine while emptying a gaseous fuel tank, comprising: coupling a gaseous fuel from the tank to a fuel injector through a restriction; andwith a controller, determining a choked sonic mass flow rate of the gaseous fuel through the restriction and controlling a mass flow rate from said fuel injector to the engine to be on average less than the choked sonic mass flow rate of said gaseous fuel through said restriction. 2. The method recited in claim 1, further comprising, with the controller, substantially maximizing said mass flow rate from said fuel injector to substantially minimize time for fuel tank emptying while maintaining on average said mass flow rate from said fuel injector to be less than said choked sonic mass flow rate of said gaseous fuel through said restriction. 3. The method recited in claim 1, wherein said choked sonic mass flow rate of said gaseous fuel through said restriction is determined by the controller from gaseous fuel tank pressure. 4. The method recited in claim 1, wherein the determination of the choked sonic mass flow rate of said gaseous fuel through said restriction is performed by the controller when gaseous fuel flows through said restriction at a substantially constant velocity, and wherein the choked sonic mass flow rate is determined as a function of a pressure in the gaseous fuel tank. 5. The method of claim 1, wherein said fuel injector is coupled to an engine intake manifold. 6. The method recited in claim 1, wherein said fuel injector is coupled directly to an engine combustion chamber. 7. The method recited in claim 1, wherein said restriction is incorporated in a fuel pressure regulator. 8. The method recited in claim 7, further comprising coupling said gaseous fuel from the tank around said restriction and around said regulator when tank pressure is less than a predetermined pressure. 9. A method for controlling an engine while emptying a gaseous fuel tank, comprising: coupling a gaseous fuel from the tank to a gaseous fuel injector through a restriction;with a controller, determining a choked sonic mass flow rate of the gaseous fuel through the restriction and controlling a mass flow rate from said fuel injector to the engine to be on average less than the choked sonic mass flow rate of said gaseous fuel through said restriction;injecting a liquid fuel into the engine through a liquid fuel injector; andwith the controller, controlling said gaseous fuel injector and said liquid fuel injector to substantially achieve a desired engine operation. 10. The method recited in claim 9, wherein said desired engine operation is engine operation at a desired air/fuel ratio. 11. The method recited in claim 9, wherein said desired engine operation is engine operation to achieve a desired engine torque. 12. The method recited in claim 9, further comprising, with the controller, substantially maximizing said mass flow rate from said fuel injector to substantially minimize time for fuel tank emptying while substantially maintaining said mass flow rate from said fuel injector to be less than the choked sonic mass flow rate of said gaseous fuel through said restriction. 13. The method recited in claim 9, wherein said gaseous fuel injector is connected to an engine intake manifold to deliver gaseous fuel to said engine through an engine intake valve. 14. The method recited in claim 9, wherein said gaseous fuel injector is connected to an engine combustion chamber to deliver gaseous fuel directly into said combustion chamber. 15. The method recited in claim 9, wherein said restriction is incorporated in a fuel pressure regulator. 16. The method recited in claim 15, further comprising coupling said gaseous fuel from the tank around said restriction and around said regulator when tank pressure is less than a predetermined pressure. 17. A method for controlling an engine while emptying a gaseous fuel tank, comprising: coupling a gaseous fuel from the tank to a gaseous fuel injector through a restriction and a pressure regulator;with a controller, determining a sonically limited mass flow rate of the gaseous fuel through the restriction, and substantially maximizing a mass flow rate of the gaseous fuel from said fuel injector to substantially minimize a time for fuel tank emptying while substantially maintaining said mass flow rate of the gaseous fuel from said fuel injector to be less than the sonically limited mass flow rate of said gaseous fuel through said restriction;injecting a liquid fuel into the engine through a liquid fuel injector; andwith the controller, controlling said liquid fuel injector to substantially achieve a desired engine operation. 18. The method recited in claim 17, wherein said desired engine operation is engine operation at a desired air/fuel ratio. 19. The method recited in claim 17, wherein said desired engine operation is engine operation to achieve a desired engine torque. 20. The method recited in claim 17, wherein said desired engine operation is engine operation to achieve a desired idle speed.
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이 특허에 인용된 특허 (17)
Boyer,Brad; Stockhausen,William, Control strategy to better usage of fuel in gaseous engine.
Polletta David F. (Northville MI) Bjerke David F. (Birmingham MI) Miller William S. (Wixon MI) Todd Steven G. (Sterling Heights MI), Fuel injection apparatus for vehicles.
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