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The engine is the heart of the hybrid electric vehicle power equipment. In order to ensure the fast and stable operation of hybrid electric vehicle, it is necessary to design the intelligent control system. When the current control system is used to control the engine speed of hybrid electric vehicle, the engine speed can not be detected quickly, so it is difficult to achieve the best results. Therefore, the design method of hybrid electric vehicle engine speed intelligent control system of soft switching Bang Bang is proposed based on PID neural network. Hybrid electric vehicle engine speed intelligent control system based on the Mcs 51 series 8751 microcontroller as the core digital signal detection system of hybrid electric vehicle engine speed, and control the output of D/A analog signal, digital signal and display the engine speed in the LED display, the PWM modulator amplifier to generate hybrid electric vehicle engine startup PWM wave, PWM wave power supply engine amplified by frequency pulse filling, measuring device of hybrid electric vehicle engine speed by Bang Bang neural network PID algorithm to calculate the hybrid electric vehicle engine speed error, to achieve the effect of real-time control of hybrid electric vehicle engine speed. The simulation results show that the proposed design method can ensure the engine speed and stability.