アイテム詳細

要旨

Controller synthesis techniques for continuous systems with respect to temporal logic specifications typically use a finite-state symbolic abstraction of the system model. Constructing this abstraction for the entire system is computationally expensive, and does not exploit natural decompositions of many systems into interacting components. We describe a methodology for compositional symbolic abstraction to help scale controller synthesis for temporal logic to larger systems. We introduce a new relation, called (approximate) disturbance bisimulation, as the basis for compositional symbolic abstractions. Disturbance bisimulation strengthens the standard approximate alternating bisimulation relation used in control, and extends naturally to systems which are composed of sub-components possibly connected in feedback; disturbance bisimulation handles the feedback signals as disturbances. After proving this composability of disturbance bisimulation for metric systems, we show how one can construct finite-state abstractions compositionally for each component, so that the abstractions are simultaneously disturbance bisimilar to their continuous counterparts. Combining these two results, we can compositionally abstract a network system in a modular way while ensuring that the final composed abstraction is distrubance bisimilar to the original system. We discuss how we get a compositional controller synthesis methodology for networks of such systems against local temporal specifications as a by-product of our construction.