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In this paper, a method based on Ziegler Nichols frequency response of the vehicle servo system adaptive PID controller is proposed. The control circuit online identify important critical frequency response characteristics of process object through input and output data in the normal process operation, and then the system online update PID controller parameters based on Ziegler Nichols setting rules or by the improved method. The adaptive process of PID controller can online real-time correct parameters and ensure the control loop always work in the best condition even under the operating conditions change.The results show that the method has stronger robustness and adaptive ability. Introduction The traditional PID control principle is simple for use and strong adaptability, so it widely used in all kinds of industrial process control field. But PID controller parameters adjustment needs certain process and the optimal parameters selection is more troublesome, the process of PID control can't effectively to online control system for some system parameters change, so it can't satisfy the PID parameter changes request with the corresponding system parameters change, that it seriously affected the control effect. Ziegler Nichols parameters tuming method is proposed in this paper: when the process variable and the speed change, we establish a set of empirical formula that set these test results into the right performance parameters. Ziegler Nichols frequency response method proposed in this paper online optimize the feedback rotor speed and magnetic pole position of vehicle antenna servo system, improve the control precision of the system,and can guarantee the system always run in the best state. Through the establishment of motor rotating speed model, we constructed vehicle servo control system simulation diagram based on PID tuning Ziegler Nichols method.The simulation results show that the Ziegler Nichols parameter tuning method PID controller has good dynamic performance on tracking the set point response , less overshoot and good steady state performance. It has a strong ability to adapt to the object parameters change. The mathematical model of vehicle antenna servo system Vehicle antenna system consists of two parts: indoor equipment and outdoor equipment. Outdoor equipment is mainly antenna servo tracking system (including the platform, platform servo tracking system, inertial sensors, GPS, satellite antenna, etc.); Indoor equipment is mainly the controller (including the sensor interface, data acquisition, controllers, satellite receiver, etc.) and the host computer.Two parts use cable connection. The system has the two big functions of a stable track and recept satellite singnals. This system uses single-chip microcomputer control and takes only less hardware system, then motor control system can be realized. This system adopts the incremental light code disc feedback the rotor speed and magnetic pole position and the initial position. Vehicle antenna servo system control diagram is shown in figure1. 5th International Conference on Information Engineering for Mechanics and Materials (ICIMM 2015) © 2015. The authors Published by Atlantis Press 72

The Design of Vehicle Antenna Servo Control System Based on Ziegler Nichols PID Control