Guiding and Re ning Simulation using Temporal

We illustrate TeQSIM, a qualitative simulator for continuous dynamical systems. It combines the expressive power of qualitative diierential equations with temporal logic by interleaving simulation with model checking to constrain and reene the resulting predicted behaviors. Temporal logic expressions are used to specify constraints that restrict the simulation to a region of the state space and to specify trajectories for input variables. A propositional linear{time temporal logic is adopted, which is extended to a three valued logic that allows a formula to be conditionally entailed when quantitative information speciied in the formula can be applied to a behavior to reene it. We present a formalization of the logic with theoretical results concerning the adopted model checking algorithm (correct-ness and completeness). We show also an example of the simulation of a non{autonomous dynamical system and illustrate possible application tasks, ranging from simulation to monitoring and control of continuous dynamical systems, where TeQSIM can be applied .