电喷发动机过渡工况空燃比鲁棒控制研究

阐述了最优H∞控制理论,并将其用于电喷发动机空燃比控制;在充分考虑外部干扰和系统模型不确定性的情况下,讨论并制定了最优H∞理论控制策略.采用面向对象的GT-Power仿真软件,从物理模型出发建立了电喷发动机仿真模型;用Matlab/Simulink软件建立起相应的最优H∞控制器和PI控制器;最后运用Matlab/Simulink与GT-Power的接口,建立电喷发动机实时控制系统.仿真结果表明:最优H∞控制相对于PI控制具有更好的鲁棒稳定性和抗干扰能力,提高了空燃比的控制精度.

Research on the Transient Air Fuel Ratio Control of SI Engine Based on Robust Control Theory

The basic method of H-infinity Optimum control theory was described and applied to the design of air fuel ratio controller in electronic fuel injection engine. The simulation model was established with the GT-Power software based on the physical model. In the case of outside disturbance and model uncertainty, the strategy of H-infinity Optimum was discussed and determined. The controller of H-infinity Optimum and PI was established with the Matlab/Simulink software. A real-time control system was established for electronic fuel injection engine through using the juncture between the GT-Power and Matlab/Simulink software. The simulation results have shown that the robust stability and disturbance rejection of H-infinity Optimum controller are better than those of PI controller, and H-infinity Optimum controller can improve air fuel ratio control accuracy.