Patent ID: 6880530
Filing Date: 2005-04-19
Classification: F02D

Abstract:
1. A fuel supply system comprising: means for detecting operating condition of an engine; means for calculating the width of the fuel injection pulse based on the detected operating condition, the fuel injection pulse including valve-opening signal and holding signal; means for supplying valve-opening current to the solenoid located in a fuel injector based on the fuel injection pulse width; means for supplying solenoid holding current to hold the valve-opening condition after the valve-opening current has reached a predetermined current value; wherein said fuel supply system supplies current to said solenoid when the logical product of said valve-opening signal and said holding signal has been formed; and wherein said fuel supply system diagnoses an abnormality of the fuel injector when the time period from the start of said fuel injection pulse until said valve-opening current reaches the predetermined current value is shorter than a predetermined time period.