Robust performance design for a car steering device

In this paper we consider the problem of designing a robust controller for a prototypal car steering device. The plant has been modeled in view of the control objectives, taking into account the trade-off between the accuracy of the description and the complexity of the model. The obtained model depends on two largely uncertain parameters. At a first step a state space H_∞ approach has been used for a “nominal” design. Then we used a new robust design technique, that allows to construct the design parameter set of a given structure controller for which the performance specifications are guaranteed in face of the parameter uncertainties