H∞ Control of Automotive Active Suspension with Linear Motor

Abstract

In this paper an automotive active suspension controller with linear electric motor using H∞ theory has been designed. A new approach to the active suspension problem rests in an actuator, because the tubulus linear electric motor has been applied as an actuator. Usage of automotive active suspension has two main reasons - to increase ride comfort and to improve handling performance with respect to the reduction of forces acting on the road. Both this requirements are contradictory and it's impossible to satisfy them simultaneously with passive suspension. The H∞ theory has been implemented into a Matlab software and suitable controller satisfying robustness and performance of the system has been obtained. For a controller analysis and synthesis a one-quarter-car model has been used. From our results it implies that the choice of the H∞ theory and a linear motor actuator has been appropriate.