Applications of output feedback in variable structure control

Most of the techniques for the design of Variable Structure Control Systems (VSCS) for both scalar and multivariable systems that is presented in the literature assumes that either the state vector is directly measurable or that an observer is used to reconstruct the state. In systems which do not have the full state vector available or that have a set of output measurements y, the usual technique for VSCS design of equivalent control cannot be applied. This chapter discusses the design of VSCS for the case of output feedback. This will be followed by a section extending the ideas to the output feedback case.