Modeling, design and implementation of discrete sliding mode control for an engine idle speed control system

A nonlinear model for the idle speed control (ISC) system of a 4-cylinder, 2.4-litre DaimlerChrysler car engine has been developed in this paper based on analytical methods and actual operational data. Through nonlinear state transformation and local linearization, the system model is then changed into a suitable form for which different control techniques and schemes can be applied. A discrete sliding mode (DSM) controller has been designed based on a reachability condition proposed in this paper. The resulting DSM control system was implemented into the DaimlerChrysler engine. The experimental results show that DSM control system has superior performance characteristics on tracking the desired idle speed and rejecting the system disturbances when compared with the existing controller.

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