Abstract: This paper proposed a differential prior proportional differential derivative (PID) control algorithm to optimize the original control of the variable valve timing (VVT) valve of the engine. Moreover, analyzed the working principle and mechanical structure of the VVT and determined key parameters of the VVT before established a mathematical model and Simulink simulation model, by means of a Matlab/Simulink platform. Using a real machine platform and the simulation platform to verify the proposed control algorithm. The results show that the overshoot of the differential prior PID algorithm proposed in this paper is reduced by 0.8% with the static error reduced by 0.15%, in the step test; and the overshoot is reduced by 1% with the static error is reduced by 0.15% in the tracking test in the VVT valve control, in the face of the fluctuation of the target expectation value, compared with the traditional PID algorithm, Therefore, the algorithm completes the optimal control of the VVT valve.

Key words: vehicles, engines, variable valve timing (VVT) valve, Simulink simulation modeling, proportion integration differentiation(PID), differential prior PID control, real machine verification model