Patent ID: 6820596
Filing Date: 2004-11-23
Classification: F02D,Y02T

Abstract:
A control system for a plunger-type fuel pump in an internal combustion engine, the fuel pump pumping fuel to an injector from a fuel tank such that the injector can inject the fuel into a cylinder, the control system comprising:means for determining an injection start timing of the injector; and driving means for driving the fuel pump for a second predetermined time that starts a first predetermined time earlier than the injection start timing, wherein the driving means comprises: means for detecting an engine rpm of the internal combustion engine; first setting means for setting the first predetermined time in accordance with the engine rpm; and second setting means for setting the second predetermined time in accordance with a fuel injection amount of the injector, wherein the driving means periodically drives the fuel pump at a first fixed frequency when the engine rpm is in a low rotation speed region; and wherein the driving means periodically drives the fuel pump at a second fixed frequency, which is higher than the first fixed frequency, when the engine rpm is in a high rotation speed region.