Design of a Modal Controller with Simple Models for an Active Suspension System

This paper presents a method to design modal controller with simple 1-DOF models for an active suspension system. Full-state feedback controller, especially, linear quadratic regulator (LQR) and H∞ designed 7-DOF full-car model is hard implement in actual vehicles because there are so many state variables gain elements needed be precisely measured finely tuned, respectively. To overcome the problem, it required smaller number of sensor signals. For purpose, from controllers three describing heave, roll pitch motions sprung mass. With these models, discrete-time LQR sliding mode control (SMC) adopted which generate vertical force, moments controlling mass, In inputs converted into forces at four corners input decoupling transformation. The type static output (SOF) one. By LQ SOF methodology, itself heuristic optimization method. A frequency domain analysis simulation on vehicle software, CarMaker®, show that proposed effective system ride comfort.