Double closed — Loop control of high — Regulation of electronically controlled air suspension

Electronic control air suspension in the vehicle height adjustment process in the presence of time delay, over charging, over discharge and oscillation phenomenon. In order to solve this problem, design a double closed-loop controller based on sliding mode control and PID control, through the neural network algorithm, dynamic adjustment of the controller structure parameters, in order to achieve the precise control of the body height. Precise tracking control of neural network PID algorithm is used to control the height of outer ring vehicle. For the mathematical model of the suspension, the inner loop adopts sliding mode control to realize the optimal control force tracking. Based on Matlab / Simulink software, a simulation model of the vehicle body height control system is established to verify the reliability of the system. Simulation and analysis of the process of the vehicle static height and the tracking performance of the dynamic suspension. The results show that the control system can effectively reduce the error in the adjustment process and meet the requirements of the control precision.