Patent ID: 6526948
Filing Date: 2003-03-04
Classification: F02D,F02M

Abstract:
A diagnostic system for a fuel system of an internal combustion engine, the fuel system including a fuel pump responsive to a pump command signal to supply pressurized fuel to a fuel accumulator, the fuel system responsive to a fueling command to supply fuel from the accumulator to the engine, the diagnostic system comprising:means for sensing fuel pressure within the accumulator and producing a pressure signal corresponding thereto; means for sensing rotational speed of the engine and producing an engine speed signal corresponding thereto; means for producing the pump command signal; means for producing the fueling command; means for determining a predicted pump command as a function of the fueling command, the pressure signal and the engine speed signal; and means for logging a fault if the predicted pump command deviates from the pump command signal by more than a threshold amount.