Patent ID: 7198033
Filing Date: 2007-04-03
Classification: F02D,F02M

Abstract:
1. A fuel supply system of an internal combustion engine, the fuel supply system comprising: a high-pressure pump, which includes a pump chamber provided between a fuel suction passage and a fuel discharge passage, a plunger reciprocating in the pump chamber for suctioning and discharging fuel, and an electromagnetic valve for opening and closing the fuel suction passage; pump controlling means for controlling a fuel discharge quantity of the high-pressure pump by controlling opening timing and closing timing of the electromagnetic valve with respect to the reciprocating movement of the plunger; a secondary suction passage, which branches from the fuel suction passage and communicates with the pump chamber; and a check valve disposed in the secondary suction passage, wherein the pump controlling means performs valve closing control for holding the electromagnetic valve at a closed state when a rotation speed of the engine is equal to or lower than a predetermined value.