Design and Research of a Two Level Fuzzy PID Electronic Control System for Automotive Semi-Active Suspension

Abstract

In response to the problem of outdated traditional PID control performance and excessively single control parameters in automotive suspension, a two level fuzzy PID control system for automotive semi-active suspension is proposed. The system has two control loops: the first level control loop is PID control, and the second level control loop is fuzzy control. The second level control loop fully utilizes the motion state of unsprung mass that affects the comprehensive performance of the suspension to achieve fine adjustments to the PID controller control parameters in the first level control loop, making the PID controller control parameters more suitable for adjusting suspension performance after hierarchical adjustment, thereby achieving the goal of improving ride comfort. The analysis data shows that the control performance of the two level fuzzy PID control system is significantly better than that of the PID control system, and the comprehensive performance of the suspension and ride comfort has been significantly improved.