Applying Digital MIMO Dynamic Sliding Surface Control to Idle Speed Control of Spark Ignition Engine

Abstract

The good idle speed control of spark ignition engine makes the customers comfortable and drives smooth. To derive its controller, a control-oriented object based model of spark ignition engine is discussed in this paper. To achieve accuracy tracking and reduce the control effort, a digital MIMO dynamic sliding surface control rule is proposed in this paper. The sliding mode controller will drive the system to tracking the desired response. The existence condition of the discrete sliding mode is expanded to two conditions. The first one is used to keep the sliding motion toward to the sliding surface. The next one is to keep the sliding motion convergent. The dynamic sliding surface will decrease the approaching time. At the same time, the output magnitude of the switching part will be reduced efficiently. Finally, the simulation results will demonstrate the performance of the proposed control rule. The different working conditions will show the robustness of the proposed controller for parameter variation and the external load.