Patent ID: 6240902
Filing Date: 2001-06-05
Classification: F02D,F02M

Abstract:
A drive unit for controlling a supply of fuel comprising:a fuel injector in communication with a combustion chamber of an engine;a fuel pump operatively connected to said fuel injector for selectively supplying fuel thereto;an electronic control unit for controlling a fuel injection amount of the fuel injector;wherein said electronic control unit drives said fuel pump under pulse-width modulation (PWM) using a PWM signal on the basis of control data for controlling a fuel injection amount of said fuel injector and for controlling a power supply voltage applied to said fuel pump in such a manner that when the power supply voltage of said fuel pump is larger than a rating voltage, a pulse-width of the PWM signal is made smaller than that in the case where the power supply voltage is equal to the rating voltage; and when the power supply voltage of said fuel pump is smaller than the rating voltage, the pulse-width of the PWM signal is made larger than that in the case where the power supply voltage is equal to the rating voltage.