The structure and the principle of the electronic throttle control system（ETCS） are described

and the nonlinearity is analyzed.According to the mathematical model of ETCS

three controllers are designed and simulated.The results indicate that the PID controller is easy to realize

but has an overshoot;the Fuzzy controller can better follow the control objectives

but has hysteresis;and the sliding mode controller has better robustness

and can be used to control ETCS.