Optimization Techniques in Engineering

26Design and Implementation of Control for Nonlinear Active Suspension System

Ravindra S. Rana^* and Dipak M. Adhyaru

Instrumentation and Control Department, Nirma University, Ahmedabad, India

Abstract

In this chapter, linear and nonlinear parts of an active suspension system using quarter car model have been investigated. Due to the presence of nonlinearities in spring, damper, and tire, it is impossible to achieve desired performance using linear control techniques. To ensure robustness of designated control technique in different operating conditions, nonlinearity in plant has to be considered. Nonlinear model is linearized around equilibrium point and represented in state space form. The performance of proposed quarter car model has been investigated using proportional-integral derivative (PID) and state feedback strategies. Comparison of simulation results for passive, active, and linearized model of quarter car system is discussed.

Keywords: Active suspension system, quarter car model, state feedback, PID, nonlinear system

26.1 Introduction

There has been a huge interest in robust control design in automobile. Antilock braking, active steering, active suspension systems are of prime focus for researchers. The robust controls that use system states can give better performance compared to passive suspension systems. Primary function of a suspension is to isolate passengers sitting in vehicle from different road profiles. In order to provide isolation in a vehicle, vehicle ...