Idle speed control for SI engine using triple-step nonlinear method

Idle speed control is considered as one of the most important issues in engine control. In this paper, we develop a triple-step nonlinear method to solve the idle speed control problem based on a data-physics mixed engine model. Concerning about the implementation issue, the map-related derivative items in the controller deduction are elaborately pretreated in the modeling step. Then, the controller design procedure is introduced step by step and ultimately can be divided as a steady state control, a reference dynamic based feed-forward control and a feedback control. The gains of controller are state-dependent and parameter-varying. The structure of the proposed nonlinear controller is concise and is comparable to those widely used in modern automotive control. Simulation results show the effectiveness of the designed controller.