Patent ID: 6234150
Filing Date: 2001-05-22
Classification: F02D,Y02T

Abstract:
A fuel injection control device comprising:an injector having a valve body opened and closed by an electromagnetic coil and a spring to inject the fuel in a desired amount into an internal combustion engine;a fuel pressure regulator means for adjusting the pressure of the fuel to be injected from said injector;an injector drive means for opening the valve body of said injector;various sensors for detecting the operation conditions of said internal combustion engine; andan injection control means for controlling said fuel pressure regulator means and said injector drive means depending upon said operation conditions, so that the fuel is injected in an amount corresponding to said operation conditions from said injector; whereinsaid various sensors include at least a fuel pressure sensor for detecting said fuel pressure;said injection control means includes an injector control unit that controls the time for opening said valve body by controlling the exciting current flowing into said electromagnetic coil and the excitation time depending upon said operation conditions and said fuel pressure;said injector control unit includes a holding current control unit for setting the exciting current flowing into said electromagnetic coil as a holding current after said valve body has been opened; and wherein,said holding current control unit sets said holding current to a minimum value necessary for maintaining said valve body opened, sets said holding current to a large value when said fuel pressure is high and sets said holding current to a small value when said fuel pressure is low.