초록 ▼

A fuel feeding system is provided for an internal combustion engine to permit appropriate feeding of fuel in accordance with the state of operation of the engine. A fuel line is arranged as a recirculation circuit between a fuel injector and a fuel tank. A low-pressure fuel pump is arranged in an up

A fuel feeding system is provided for an internal combustion engine to permit appropriate feeding of fuel in accordance with the state of operation of the engine. A fuel line is arranged as a recirculation circuit between a fuel injector and a fuel tank. A low-pressure fuel pump is arranged in an upstream part of the fuel line. A high-pressure fuel pump is arranged between the fuel pump and the injector. A high-pressure regulator is arranged in a fuel line portion on a downstream side of the regulator to control the pressure of fuel delivered from the pump. A bypass line connects another fuel line portion on an upstream side of the regulator and the fuel line portion each other. A switching valve is arranged in the bypass line to open or close the same. A low-pressure regulator controls the pressure of fuel in the fuel line portion at a pressure lower than a control pressure set by the regulator while the switching valve is open. ECU is arranged to perform open/close control of the switching valve so that the switching valve is closed in an ordinary operation state of the engine but is opened in a specific operation state of the engine.

대표청구항 ▼

A fuel feeding system for an internal combustion engine, comprising: a fuel line arranged between a fuel injector, disposed in the internal combustion engine, and a fuel tank and formed as a recirculation circuit extending from said fuel tank to said fuel injector and then returning from said fuel i

A fuel feeding system for an internal combustion engine, comprising: a fuel line arranged between a fuel injector, disposed in the internal combustion engine, and a fuel tank and formed as a recirculation circuit extending from said fuel tank to said fuel injector and then returning from said fuel injector to said fuel tank; a low-pressure fuel pump arranged in an upstream part of said fuel line; a high-pressure fuel pump arranged in said fuel line between said low-pressure fuel pump and said fuel injector; high-pressure control means arranged in a fuel line portion on a downstream side of said high-pressure fuel pump to control the pressure of fuel delivered from said high-pressure fuel pump; a first bypass line connecting another fuel line portion on an upstream side of said high-pressure control means and said fuel line portion on the downstream side of said high-pressure control means to each other; a switching valve arranged in said first bypass line to open or close said first bypass line; low-pressure control means for controlling the pressure of fuel in said upstream-side fuel line portion of said first bypass line at a pressure lower than a control pressure set by said high-pressure control means while said switching valve is open; and control means for performing open/close control of said switching valve so that said switching valve is closed in an ordinary operation state of said internal combustion engine but is opened in a specific operation state of said internal combustion engine, said specific operation state including at least an operation state at a start-up of said internal combustion engine.