US 8,944,030 B2 · Fuel supply apparatus

Abstract

The fuel supply apparatus optimizes the timing of performing the fuel pressure change indication and the fuel injection timing to suppress the real fuel injection amount from being differentiated from the target fuel injection amount even at the time of the fuel pressure being changed, thereby improving fuel consumption. The ECU judges that the fuel pressure change request is generated (“YES” in Step S11), and calculates the change retarding time t1 (Step S12) when the fuel pressure is at the low pressure side, and the ECU determines that the vehicle is in the warming-up state, or that the fuel is at the high temperature. The ECU sets the change timing to avoid the timing of injecting the fuel from overlapping the changing timing of the fuel pressure with reference to the injection timing of the fuel injection control (Step S13).

Claims11

Dependent claims

A fuel supply apparatus for supplying fuel to a fuel consumption unit after adjusting the pressure of the fuel, comprising:

a variable fuel pressure adjustment valve capable of assuming at least one of a high pressure state in which the fuel is maintained at a high pressure, and a low pressure state in which the fuel is maintained at a low pressure,
a changeover valve for changing the variable fuel pressure adjustment valve between the high pressure state and the low pressure state in response to an electric property of an electric power inputted therein, and
a switching control unit for controlling the electric power to be inputted or not inputted into the changeover valve,
the switching control unit being operative to set the switching timing of switching the changeover valve selectively in the high pressure state or in the low pressure state in accordance with the electric property of the electric power inputted into the changeover valve.

1 more element

A fuel supply apparatus for supplying fuel to a fuel consumption unit after adjusting the pressure of the fuel, comprising:

a variable fuel pressure adjustment valve capable of assuming at least one of a high pressure state in which the fuel is maintained at a high pressure, and at a low pressure state in which the fuel is maintained at a low pressure,
a changeover valve for changing the variable fuel pressure adjustment valve between the high pressure state and the low pressure state in response to an electric property of an electric power to be inputted therein, and
a switching control unit for controlling the electric power to be inputted or not inputted into the changeover valve,
the switching control unit being operative to detect the electric property of the electric power to be inputted or not inputted into the changeover valve under the condition that the supply or the non-supply of the electric power to the changeover valve is changed, and to estimate the time required to change the fuel pressure in accordance with the detected electric property.

1 more element

Dependencies are inferred from the claim text.

Fuel supply apparatus

Life of this patent

Fuel supply apparatus

Life of this patent

Abstract

Claims11