Abstract. The problem of maintaining the crankshaft speed of an automotive engine within a given set interval (idle speed control), is formalized as a constrained control problem using a hybrid model of the engine. The control problem is difficult because the system has delays and a large number of constraints. The approach for the synthesis of a controller for this system is based on the theory developed for affine systems on polytopes. A structured control synthesis procedure is applied in which constraints for state and input variables are backward propagated from the controlled output (the crankshaft speed) across successive subsystems.
Andrea Balluchi, Federico Di Natale, Alberto L. Sa