Developments in Constrained Control Using Reference Governors

The paper provides an overview of reference governors, command governors and extended command governors, which are add-on schemes for enforcing pointwise-in-time state and control constraints in set-point tracking problems. It emphasizes recent developments based on the authors work and a new strategy for implementing command governors as they apply to nonlinear systems. Comments on future directions in reference governor research are made. A list of references is included.