This paper studies the automatic development and design of spread spectrum and amplitude modulation in PID control system, puts forward the technology of using electromagnetic wheel to spread spectrum and amplitude modulation for electric vehicles, studies the motor system model controlled by PID control system, compares the spread spectrum and amplitude modulation technology of PID control system with Ziegler-Nichols Cohen-Coon and Chien-Hrones-Reswick(CHR), and combines CHR method with the longest overshoot and 20% overshoot.<br>By adding three values of Kp(70), Kp(80) and Kp(100) to test, this experiment considers the behavior of the system in rising time, setting time and% OS value, and finds that Kp(80) is the best value, and by further testing by adding Kd value, the best value Kp(80) is input Kd(0). 8),Kd(1。 2) and Kd(2), in which the test results consider the behavior of the system in the values of Risetime, setting time and% OS, and Kp(80)Kd(1. 2) It is the best value to adjust the amplification of PID control system.
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