A Robust Invariance Approach to Idle Speed Control of a Spark Ignited Engine

Authors:	Caravani Paolo, Univ of L'Aquila, Italy Girasole Giovanni, Univ of L'Aquila, Italy
Topic:	2.5 Robust Control
Session:	Set-Invariance Techniques
Keywords:	robust control, constrained systems, control invariance, box invariance

Abstract

Idle speed control of a spark ignition engine is studied via a control invariant approach.A hybrid system describes torque generation atcycle--level. The continuous--time dynamics is reset at prescribedcrankshaft angles. Time--discretization allows to handle delays in thecontrol loop and constraints on state and control variables in a simple form by means of acontrol invariant technique. The synchronization problem is solved by a robustextension of the same technique. Controller implements a piecewise--linear state--feedback law.