Dual fuel system for an internal combustion engine
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02D-019/06
F02M-043/04
F02M-069/50
F02M-021/10
F02D-019/08
F02D-041/00
출원번호
US-0783881
(2013-03-04)
등록번호
US-9212643
(2015-12-15)
발명자
/ 주소
Deliyski, Tzvetan
출원인 / 주소
DELIA LTD.
대리인 / 주소
Brooks Kushman P.C.
인용정보
피인용 횟수 :
0인용 특허 :
13
초록▼
A dual fuel system provides first and second fuels to internal an engine. Both fuels are stored in a storage tank, separated by a flexible membrane. A fuel rail receives either or both of the fuel types and distributes the fuels to fuel injectors. Upon shutdown of the engine, the second fuel is evac
A dual fuel system provides first and second fuels to internal an engine. Both fuels are stored in a storage tank, separated by a flexible membrane. A fuel rail receives either or both of the fuel types and distributes the fuels to fuel injectors. Upon shutdown of the engine, the second fuel is evacuated from the fuel rail into an auxiliary tank. The first fuel is subsequently supplied to the fuel rail from the storage tank. Upon a restarting of the engine after a predetermined time subsequent to the shutdown of the engine, the first fuel from the fuel rail is used for combustion. The second fuel from the auxiliary tank is then slowly bled into the engine or intake manifold. As the first fuel from the storage tank continues to supply the fuel rail, and the second fuel begins to supplement the first fuel in the fuel rail.
대표청구항▼
1. A dual fuel system for a vehicle capable of being propelled by two different fuels, the system comprising: at least one supply tank having a first compartment and a second compartment for supplying a first fuel and a second fuel, respectively;a fuel rail capable of delivering the first fuel and t
1. A dual fuel system for a vehicle capable of being propelled by two different fuels, the system comprising: at least one supply tank having a first compartment and a second compartment for supplying a first fuel and a second fuel, respectively;a fuel rail capable of delivering the first fuel and the second fuel to fuel injectors;at least one fuel line connecting the first and second compartments of the supply tank to the fuel rail;at least one valve disposed along the at least one fuel line for selectively distributing the first and second fuels from the supply tank to the fuel rail;an evacuation tank;an evacuation line having an inlet fluidly connected to the fuel rail, and an outlet fluidly connected to the evacuation tank;an evacuation valve disposed along the evacuation line for selectively communicating fuel from the fuel rail to the evacuation tank; andat least one controller programmed to (i) open the evacuation valve to evacuate the second fuel from the fuel rail into the evacuation tank in response to an engine-OFF signal, (ii) subsequently open the at least one valve to deliver the first fuel into the fuel rail, and (iii) controllably inject the first fuel via the fuel injectors at a first rate in response to an engine-ON signal. 2. The system of claim 1, further comprising an intake manifold, and an evacuation injector disposed between the evacuation tank and the intake manifold, wherein the at least one controller is further configured to controllably inject the second fuel from the evacuation tank via the evacuation injector to the intake manifold at a second rate less than the first rate. 3. The system of claim 1, wherein the at least one controller is further programmed to deliver the second fuel from the supply tank into the fuel rail subsequent to the engine-ON signal at a second rate generally equal to the first rate. 4. The system of claim 1, wherein the at least one supply tank is one supply tank, the system further comprising further comprising a flexible membrane disposed within the supply tank that separates the first compartment and the second compartment. 5. The system of claim 1, wherein the first fuel is gasoline and the second fuel is liquefied petroleum gas (LPG). 6. The system of claim 1, wherein the at least one controller is further programmed to open the evacuation valve to evacuate the second fuel from the fuel rail into the evacuation tank via the evacuation line in response to the engine being OFF for a time exceeding a threshold. 7. The system of claim 1, further comprising a cooling injector capable of delivering the second fuel to a cooling compartment of the fuel rail, wherein the at least one controller is further programmed to switch the at least one valve to deliver the second fuel into the fuel rail, and to open the cooling injector to cool the rail. 8. The system of claim 7, further comprising an insulation layer disposed about at least a portion of the fuel rail to inhibit an increase in temperature of the fuel rail during the delivery of the second fuel into the fuel rail. 9. The system of claim 1, further comprising a warming pad disposed about at least a portion of the second portion of the supply tank, wherein the at least one controller is further programmed to deliver the second fuel from the supply tank into the fuel rail based upon a temperature of the second fuel exceeding a temperature threshold. 10. A dual fuel system for an engine, comprising: at least one supply tank for supplying a first fuel and a second fuel;a fuel rail capable of delivering the first fuel and the second fuel to fuel injectors;an auxiliary holding tank for storing the second fuel; andat least one controller configured to (i) evacuate the second fuel from the fuel rail into the holding tank based at least upon the engine being disabled, and (ii) return the second fuel from the auxiliary holding tank to an intake of the engine based upon the engine being restarted;wherein the at least one controller is further configured to input the first fuel into the fuel rail subsequent to the evacuation of the second fuel from the fuel rail. 11. The system of claim 10, further comprising an intake manifold wherein the at least one controller is further configured to deliver the first fuel into the intake manifold in response to an engine activation signal and subsequently deliver the second fuel from the auxiliary holding tank into the intake manifold. 12. The system of claim 11, wherein the at least one controller is further configured to deliver the first fuel into the intake manifold at a first rate in response to the engine activation signal, and subsequently deliver the second fuel from the holding tank into the intake manifold at a second rate less than the first rate. 13. The system of claim 11, wherein the at least one controller is further configured to deliver the second fuel from the supply tank into the fuel rail subsequent to the engine activation signal. 14. The system of claim 10, wherein the first fuel is gasoline and the second fuel is liquefied petroleum gas (LPG). 15. The system of claim 10, wherein the at least one controller is further configured to evacuate the second fuel from the fuel rail into the holding tank based at least upon the engine being disabled for a time exceeding a threshold. 16. The system of claim 10, wherein the supply tank includes a flexible membrane for isolating the first fuel from the second fuel within the supply tank. 17. A method of providing a first fuel and a second fuel from at least one tank for operation of a vehicle having an engine and a fuel rail, the method comprising: receiving an engine-OFF signal;evacuating the second fuel from the fuel rail into a holding container based at least upon the engine-OFF signal;supplying the first fuel from the tank to the fuel rail subsequent to the evacuating;receiving an engine-ON signal;supplying the first fuel from the fuel rail to the engine at a first rate based at least upon the engine-ON signal;determining a temperature of the fuel rail; andsupplying the second fuel into the fuel rail based upon the temperature of the fuel rail exceeding a threshold. 18. The method of claim 17, further comprising supplying the second fuel to the engine from the holding container at a second rate generally proportional to the first rate. 19. The method of claim 18, further comprising increasing the second rate toward the first rate until the first rate and second rate are generally equivalent. 20. The method of claim 17, further comprising heating the tank in response to the tank being less than a temperature threshold, and supplying the second fuel into the fuel rail based upon the temperature of the fuel rail exceeding a threshold.
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