초록 ▼

A hydromechanical fuel pump system of supplying timing fluid and fuel to high pressure fuel injectors utilizing a hydromechanical fuel control circuit to control the flow of fuel that is withdrawn from a fuel reservoir by a pump and delivered to the fuel injectors which includes a speed signal gener

A hydromechanical fuel pump system of supplying timing fluid and fuel to high pressure fuel injectors utilizing a hydromechanical fuel control circuit to control the flow of fuel that is withdrawn from a fuel reservoir by a pump and delivered to the fuel injectors which includes a speed signal generator that produces a fuel pressure in a speed signal branch line of the fuel control circuit that is a function of engine rpm, and a torque shaping module that is provided in a fuel delivery branch of the fuel control circuit. The torque shaping module controls the supply pressure of the fuel flow to the injectors so that, during an initial engine operating range, the supply pressure is merely that as received from the fuel pump, in a second engine operating range, the torque shaping module causes the supply pressure to be a function of fuel pressure in the speed signal branch line as boosted by an assist means, the effect of which is removed in a third engine operating range, and in a last engine operating range, the supply pressure is determined by partially offsetting the effect of the pressure in the speed signal branch line by a counterpressure factor.

대표청구항 ▼

A hydromechanical fuel pump system for supplying timing fluid and fuel to high pressure fuel injectors comprising: (a) a pump for withdrawing fuel from a fuel reservoir and delivering the fuel under pressure to a fuel line; (b) a hydromechanical fuel control circuit means for interconnecting said fu

A hydromechanical fuel pump system for supplying timing fluid and fuel to high pressure fuel injectors comprising: (a) a pump for withdrawing fuel from a fuel reservoir and delivering the fuel under pressure to a fuel line; (b) a hydromechanical fuel control circuit means for interconnecting said fuel line to injector fuel supply rails for controlling the flow of fuel to said injectors, said fuel control circuit means comprising: (1) a speed signal generator means for producing a fuel pressure in a speed signal branch line of said fuel control circuit that is a function of engine rpm; (2) a torque shaping module, in a fuel delivery branch of said fuel control circuit, having means for receiving fuel flow from said fuel line and supplying it on through said fuel delivery branch line at a supply pressure corresponding to that of the fuel flow received by the torque shaping module in an initial operating range, for supplying the fuel received on through said fuel delivery branch line at a pressure that is a function of the fuel pressure in said speed signal branch line plus a pressure factor during a low speed engine operating range, for supplying the fuel received on through said fuel delivery branch line at a supply pressure that is a function of the fuel pressure in said speed signal branch line without said pressure factor during a middle engine operating range, and for supplying the fuel received on through said fuel delivery branch line at a supply pressure determined by partially offsetting the effect of the fuel pressure in said speed signal branch line by a counterpressure factor in a high speed engine operating range.