An Automatic Synthesis Procedure of Idle Speed Linear Quadratic Regulators Through Identification Experiments

Abstract

This paper presents an overall procedure for identification and control of internal combustion engines in idle speed conditions. The nonlinear estimated models describe the dynamics of the pressure inside the intake manifold and of the cranckshaft speed as functions of the position of the idle-speed air actuation system and of the spark advance. The linearized identified models are then used to synthesise idle-speed controllers by means of the Linear Quadratic approach. The proposed methodology allows one to determine the controller directly from data collected on-board. Identification and control results obtained by applying this approach to a 1400cm3 commercial car are reported to witness the applicability of the design technique.