Engine control design using globally linearizing control and sliding mode

In this paper the control design methods for spark ignition engine models are discussed. Both single-input single-output (SISO) and multi-input multi-output (MIMO) systems are investigated for the design of an engine control system. A comprehensive comparative study for two classes of non-linear control methods, i.e. globally linearizing control (GLC) and sliding mode control, is given. The simulations results are presented to illustrate the capability and performance of the two kinds of controllers. The results show that the controller applying GLC can give accurate tracking for the engine model without uncertainty and disturbance; however, it fails to keep good tracking performance when uncertainty is considered. In contrast, the controller using the slidingmode is able to achieve the target, which shows that the engine system with the proposed sliding mode controller has good robustness to uncertainty and disturbance. Key words: engine control, global linearizing control (GLC), internal combustion engine, MIMO, SISO, sliding mode control Nomenclature _map Air mass flow rate into cylinder (kg/s). _mat Air mass flow rate past throttle plate (kg/s). pa Atmospheric pressure (1.013 bar)