FUEL SUPPLY APPARATUS FOR AN INTERNAL COMBUSTION ENGINE

摘要

A high pressure fuel pump (200) boosts the pressure of fuel to discharge a quantity according to the closing period of an electromagnetic spill valve (250). A fuel distributor pipe (130) receives and delivers to an in-cylinder injector (110) the fuel discharged from the high pressure fuel pump (200). A fuel pressure sensor (400) measures a fuel pressure (Pt) in a fuel distributor pipe (160). The control of open/closure of the electromagnetic spill valve (250) according to a target pressure of fuel pressure (Pt) is carried out in a manner similar to that of in-cylinder injection execution even during an in-cylinder injection suppressing period in which fuel is not injected from the in-cylinder injector (110). Accordingly, fuel pressure can be controlled at high accuracy during the in-cylinder injection suppressing period and subsequent in-cylinder injection resuming time.