DIRECT INJECTION FUEL SYSTEM WITH CONTROLLED ACCUMULATOR ENERGY STORAGE AND DELIVERY

摘要

A direct injection (DI) fuel supply system includes an accumulator valve coupled to a high pressure fuel line at a position between an accumulator and a fuel rail. A controller of the DI fuel supply system is configured to control the accumulator valve to maintain the pressurized fuel housed in the fuel rail at a desired pressure and to control the accumulator valve proximate a fuel injection event by a fuel injector such that the accumulator supplies the fuel rail with approximately the portion of the pressurized fuel injected by the fuel injector during the fuel injection event. This positioning of the accumulator valve between the DI positive displacement fuel pump and the fuel rail together with active control thereof also insulates the fuel rail and the fuel injector from fuel pressure pulsations generated by the DI positive displacement fuel pump.

主权项

1. A direct injection (DI) fuel supply system for an engine of a vehicle, the DI fuel supply system comprising:
a fuel rail in fluid communication with a high pressure fuel line and configured to house pressurized fuel; a fuel injector configured to inject at least a portion of the pressurized fuel housed in the fuel rail into the engine; a DI positive displacement fuel pump driven by a crankshaft of the engine, the DI positive displacement fuel pump in fluid communication with and configured to supply the pressurized fuel to the high pressure fuel line; an accumulator fluidly coupled to the high pressure fuel line at a position between the fuel rail and the fuel pump, the accumulator configured to house the pressurized fuel; an accumulator valve positioned in the high pressure fuel line at a location between the accumulator and the fuel rail, the accumulator valve configured to regulate the flow of the pressurized fuel from both the DI fuel pump and the accumulator to the fuel rail; and a controller configured to control the accumulator valve to maintain the pressurized fuel housed in the fuel rail at a desired pressure.