Air — Fuel Ratio Control of SI Engine Based on Feedback Linearization

Vehicle engines often operate under various operating conditions, and their air fuel ratio (AFR) system has characteristics of nonlinearity, time-varying, and time delay, which can bring difficulties to system modeling and affect the control effect of the air fuel ratio. Therefore, studying control strategies that consider the characteristics of the air fuel ratio system is of great significance. Firstly, the engine air fuel ratio system is modeled, and a feedback linearization control method is used to design an air fuel ratio controller to ensure that the engine’s air fuel ratio is stable at the target value. Finally, the effectiveness of the modeling of the air fuel ratio system and the air fuel ratio controller was verified through experiments.