Abstract
In this paper, we study supervisory control of discrete event systems under partial observations. Most of the research on supervisory control considers a supervisor which takes a control action according to only event sequences. This paper proposes a supervisor which selects a control pattern based upon partial observations of events and states. We first derive necessary and sufficient conditions under which there exists a supervisor for a given language, namely, a control specification. It is shown that our supervisor is more powerful than a supervisor which uses only event sequences. Next, we study the case that there does not exist a supervisor for a given language. We present a sublanguage of a given language for which a supervisor exists.
