Abstract
A new fault diagnostics method for the idle speed control of an internal combustion (IC) engine is proposed. Two specific faults are of interest: an input fault, associated with the throttle actuator, and an output fault related to the pressure sensor. In addition, the algorithm is required to be robust to external torque loads varying from 5 to 10Nm, as well as modeling errors due performance variations of the real engine during different operating modes: cold and warm. The model based approach is characterized by residual generators and requires only two residuals and an active threshold technique to perform fault diagnosis. Simulation results show 100% fault detection during nominal temperature conditions, and 94% fault detection during initial operating stage of the engine.
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