Acceleration-difference-feedback-based decoupling with PID control strategy for active suppression of vehicle

This study addresses the issue of vertical-pitch dynamic coupling in active suspension systems caused by traditional velocity-feedback control. We introduce a novel ADF-PID control strategy that combines acceleration difference feedback (ADF) decoupling with PID control to independently regulate vehicle vertical and pitch angular accelerations. The approach generates an ADF signal by analyzing discrepancies between the accelerations at the front and rear suspension connection points and the vehicle’s center of mass, enabling effective decoupling of vertical-pitch motion. Additionally, a velocity-error-feedback PID system is utilized to simultaneously reduce both vertical and pitch angular accelerations. The simulation results show that the proposed technique effectively reduces vertical acceleration and significantly enhances pitch angular acceleration under various road conditions, including bump and random roads. On a bump road surface, the ADF-PID control system increases vertical acceleration by 5.5% and pitch angle acceleration by 89%, compared to reference. In three-bump road scenarios, vertical and pitch angle accelerations improve by 81% and 96%, respectively, compared to a passive suspension setup. Additionally, under excitation-class C road conditions, vertical acceleration rises by 19% while pitch angle acceleration increases by 93% relative to the passive suspension system.