US 7,822,534 B2 · Fuel supply device and fuel supply method for internal combustion engine

Abstract

A fuel supply device (30) for an engine (1) pressurizes the fuel drawn up from a fuel tank (31) by the low-pressure fuel pump (32) and stores it in a delivery pipe (34), and injects the fuel stored in the delivery pipe (34) from an injector (35). The fuel supply device (30) includes a return passageway (50) connecting the delivery pipe (34) and the fuel tank (31), and a relief valve (51) that is provided on the return passageway (50) and that is capable of being switched between an open state for connecting the delivery pipe (34) and the fuel tank (31) in communication and a closed state for shutting off the delivery pipe (34) and the fuel tank (31) from each other in communication. An ECU (60) switches the relief valve (51) to the open state and operates the low-pressure fuel pump (32), if a predetermined stop condition for stopping the engine (1) is satisfied.

Claims12

Dependent claims

A fuel supply device for an internal combustion engine in which fuel drawn up from a fuel tank by a fuel feed pump is pressurized and stored in a pressure accumulator and the fuel stored in the pressure accumulator is injected from a fuel injection valve, comprising:

a return passageway connecting the pressure accumulator and the fuel tank;
a control valve that is provided on the return passageway and that is switched between a communicating position for connecting the pressure accumulator and the fuel tank in communication and a shutting-off position for shutting off the pressure accumulator and the fuel tank from each other in communication;
and
an operation control portion that switches the control valve to the communicating position and operates the fuel feed pump if a predetermined stop condition for stopping the internal combustion engine is satisfied,
wherein if the predetermined stop condition is satisfied, the operation control portion initially switches the control valve to the communicating position and operates the fuel feed pump, and then switches the control valve to the shutting-off position and operates the fuel feed pump.

2 more elements

A fuel supply method for an internal combustion engine in which fuel drawn up from a fuel tank by a fuel feed pump is pressurized and stored in a pressure accumulator and the fuel stored in the pressure accumulator is injected from a fuel injection valve, comprising:

connecting the pressure accumulator and the fuel tank to each other in communication if a predetermined stop condition for stopping the internal combustion engine is satisfied;
and
shutting off the pressure accumulator and the fuel tank from each other in communication if the predetermined stop condition is not satisfied;
wherein if the predetermined stop condition is satisfied, initially the pressure accumulator and the fuel tank are connected in communication and the fuel feed pump is operated, and then the pressure accumulator and the fuel tank are shut off from each other in communication and the fuel feed pump is operated.

1 more element

Dependencies are inferred from the claim text.

Fuel supply device and fuel supply method for internal combustion engine

Life of this patent

Fuel supply device and fuel supply method for internal combustion engine

Life of this patent

Abstract

Claims12