Lyapunov-Based Feedback Control of Auxiliary Power Unit for Series Hybrid Electric Vehicles

A model-based controller of auxiliary power unit (APU) which can deal with uncertain model parameters is present. The proposed APU controller takes attention to dynamic behavior of the international combustion engine (ICE) due to its slower response compared to the generator. A mean value engine model is introduced and implemented to design the APU controller. The model parameters are supposed known first, and a basic controller is proposed. Then, considering the model uncertainty, a robust controller is given. The controllers are constructed in such a way that the throttle of ICE and the generator torque are chosen as the control variables. The convergence of the proposed controllers is obtained through the stability analysis based on Lyapunov theory. Simulations are conducted, and the results are shown to demonstrate the controllers.