Methods and systems are provided for delivering fuel to a port injector fuel rail in a port fuel direct injection (PFDI) engine. In one example, the port injector fuel rail may receive fuel from each of a compression chamber and a step chamber of a direct injection fuel pump coupled in the PFDI engi
Methods and systems are provided for delivering fuel to a port injector fuel rail in a port fuel direct injection (PFDI) engine. In one example, the port injector fuel rail may receive fuel from each of a compression chamber and a step chamber of a direct injection fuel pump coupled in the PFDI engine. In this way, pressurized fuel may be supplied to the port injector fuel rail during an entire cycle of the direct injection fuel pump.
대표청구항▼
1. A method for an engine, comprising: delivering pressurized fuel to a port injector fuel rail from each of a compression chamber of a direct injection fuel pump and a step chamber of the direct injection fuel pump. 2. The method of claim 1, wherein a pressure of the pressurized fuel is regulated v
1. A method for an engine, comprising: delivering pressurized fuel to a port injector fuel rail from each of a compression chamber of a direct injection fuel pump and a step chamber of the direct injection fuel pump. 2. The method of claim 1, wherein a pressure of the pressurized fuel is regulated via a pressure relief valve. 3. The method of claim 2, wherein the pressure of the pressurized fuel is higher than an output pressure of a lift pump. 4. The method of claim 3, wherein the lift pump is an electrical pump. 5. The method of claim 3, wherein the lift pump supplies fuel to each of the compression chamber and the step chamber of the direct injection pump. 6. The method of claim 1, further comprising, delivering pressurized fuel to a direct injector fuel rail from only the compression chamber of the direct injection fuel pump. 7. The method of claim 6, wherein a pressure of the pressurized fuel delivered to the direct injector fuel rail is regulated by a solenoid activated check valve. 8. The method of claim 7, wherein pressurized fuel is delivered to the direct injector fuel rail from the compression chamber of the direct injection fuel pump when the solenoid activated check valve is energized to fully closed. 9. The method of claim 7, wherein pressurized fuel is delivered to the port injector fuel rail from the compression chamber of the direct injection fuel pump when the solenoid activated check valve is in a pass-through state. 10. The method of claim 1, wherein the direct injection fuel pump is operated by the engine. 11. A method for an engine, comprising: supplying fuel to each of a port injector fuel rail and a direct injector fuel rail from a direct injection fuel pump, the fuel supplied to the port injector fuel rail during each of a compression stroke and a suction stroke in the direct injection fuel pump and the fuel supplied to the direct injector fuel rail only during the compression stroke in the direct injection fuel pump. 12. The method of claim 11, wherein the fuel supplied to the port injector fuel rail is at a pressure higher than an output pressure of a lower pressure pump, the lower pressure pump delivering fuel to the direct injection fuel pump, and wherein the pressure of the fuel supplied to the port injector fuel rail is regulated by a pressure relief valve. 13. The method of claim 11, wherein fuel is supplied to the port injector fuel rail during the compression stroke when an electronically controlled solenoid valve is deactivated to a pass-through mode. 14. The method of claim 13, wherein the electronically controlled solenoid valve is deactivated to the pass-through mode in response to ceasing fuel flow to the direct injector fuel rail during the compression stroke. 15. The method of claim 11, further comprising providing a differential pressure in the direct injection fuel pump between a top of a pump piston and a bottom of the pump piston during at least the suction stroke. 16. A system, comprising: a port fuel direct injection (PFDI) engine;a direct injection fuel pump including a piston, a compression chamber, a step chamber arranged below a bottom surface of the piston, a cam for moving the piston, and a solenoid activated check valve positioned at an inlet of the compression chamber of the direct injection fuel pump;a lift pump fluidically coupled to each of the compression chamber and the step chamber of the direct injection fuel pump;a first pressure relief valve positioned in a first line coupled to the compression chamber of the direct injection fuel pump;a direct injector fuel rail fluidically coupled to the compression chamber of the direct injection fuel pump;a port injector fuel rail fluidically coupled to each of the compression chamber and the step chamber of the direct injection fuel pump; anda second pressure relief valve positioned upstream of the port injector fuel rail, the second pressure relief valve biased to regulate pressure in each of the port injector fuel rail, the step chamber, and the compression chamber. 17. The system of claim 16, wherein the lift pump is electrically actuated, and wherein the direct injector fuel pump is driven by the PFDI engine, and is not electrically actuated. 18. The system of claim 16, wherein each of the first pressure relief valve and the second pressure relief valve is biased to regulate pressure in the compression chamber of the direct injection fuel pump during a compression stroke in the direct injection fuel pump when the solenoid activated check valve is in a pass-through state. 19. The system of claim 16, wherein the second pressure relief valve is biased to regulate pressure in the step chamber during a suction stroke in the direct injection fuel pump. 20. The system of claim 16, further comprising a controller having executable instructions stored in a non-transitory memory for activating the solenoid activated check valve to a closed position during a compression stroke of the direct injection fuel pump based on a fuel rail pressure of the direct injector fuel rail.
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이 특허에 인용된 특허 (17)
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