5 3requirements, such as frequential ones and hence to derive new algorithms. Also, we can use the reduced-order formulation to consider the expansion of the positively invariant set when the saturations are applied [I91 and to evaluate some performance requirements in the interior of the extended set. Investigations in these directions, as well as in the integration of reduced-order observers in the control schemes, are being developed.
REFERENCESA. Benzaouia and A. Hmamed, "Regulator problem for linear continuous-time systems with nonsymmetrical constrained control,"