Abstract
The dead time and disturbances in the process of intake air control are some of the adverse factors that induce poor idle-speed control response and stability. In this paper, a mean-value engine model with dead time and disturbances is constructed. Two control methods, a modified Smith predictor and sliding mode control were investigated. Transition disturbances before and after the dead time and engine speed fluctuation were added to the simulation. From the simulation results, the shorter adjustment time and the lower deviation for rejecting disturbances are obtained by applying the sliding mode control.
