On the asymptotic stabilization of unstable linear systems with bounded controls

This work is devoted to stabilization of unstable continuous-time linear systems in the presence of saturating actuators. We show that, if the state matrix has a single real strictly positive eigenvalue, it is possible to construct a linear feedback such that the set of values satisfying the saturation constraint is an invariant set for the closed-loop system. Moreover, once the initial datum is arbitrarily fixed, we can ensure asymptotic stabilization of the system splitting the control variable in a predefined number of saturating components. A design technique for a controller having such invariance property is also given for discrete linear systems. © 2009 Pushpa Publishing House.