PDF Versus Pid Controller for Active Vehicle Suspension

Abstract

The main objective of this work is to investigate the dynamic performance of vehicle active suspension systems. A design for quarter vehicle equipped with active suspension system is presented. The dynamic behavior of the system evaluated by developing a mathematical model for the controlled system and developing a computer simulation program. The system incorporates an electrohydraulic servo system controlled by a proportional, integral, derivative (PID) controller. Alternatively, a pseudo derivative feedback controller (PDF) is used. The parameters of both of the controllers were estimated and tuned to minimize the integrated of square error (ISE) and integral of time absolute error (ITAE) criterions. The proportional, derivative (PD) controller gave the shortest settling time. The PDF controller showed negligible maximum percentage overshoot. While the PID showed a maximum percentage overshoot within 5%. The proportional, integral (PI) and PD showed longer settling time.