Design of unknown-input PI observer and exact LTR

  • Kim, Hwan-Seong (Department of Electrical Engineering and Computer Science, Kumamoto Univ., Kurokami 2-39-1, Kumamoto 860, Japan (Tel:+81-96-342-3631)) ;
  • Kawaji, Shigeyasu (Department of Electrical Engineering and Computer Science, Kumamoto Univ., Kurokami 2-39-1, Kumamoto 860, Japan (Tel:+81-96-342-3631))
  • Published : 1995.10.01

Abstract

In this paper, an unknown-input proportional integral (PI) observer is presented and its applicability to the design of exact loop transfer recovery (Exact LTR) is shown. First, a sufficient condition for the PI observer to estimate the states of systems without knowledge of unknown input is derived. A simple existence condition of the observer is given. Under the conditions, the Exact LTR with specified observer's poles is achieved by the unknown-input PI observer.