Research On Electronic Throttle Control Strategy Based On Model Reference Adaptive Control

Energy and environmental issues have received widespread attention from governments.Increasingly stringent fuel consumption standards and emission standards put forward higher demands on the economy,power and emission performance of automotive engines.As an important component of the vehicle electronic control system,the electronic throttle can adjust the throttle opening angle and control the amount of air entering the engine cylinder in time according to the working conditions of the vehicle.Accurate and rapid control of the electronic throttle valve position is beneficial to improve fuel combustion efficiency,reduce exhaust emissions,improve engine performance,and improve vehicle safety and comfort.Electronic throttle has high requirements for real-time,reliability and stability,but the uncertainty of parameters and the existence of disturbance increase the difficulty of electronic throttle control.Considering the impact of parameter uncertainty and disturbance,the following research is carried out to improve the performance of the electronic throttle closed-loop system:The working principle and structural characteristics of the electronic throttle are introduced in the beginning of this paper,and the mathematical model is built through dynamic analysis.In order to deal with the uncertainty of system parameters,an electronic throttle control method based on model reference adaptive control(MRAC)is proposed.The design steps of the electronic throttle model reference adaptive control system are elaborated in detail,and the control law and adaptive law of the adaptive system are solved according to the Lyapunov stability theory.In order to verify the control effect of the designed controller,simulation and experimental research are carried out and compared with the traditional PI control scheme.Simulation and experimental results show that the controller designed in this paper has better dynamic,static and adaptive performance than the PI controller.In order to further improve the anti-disturbance ability of the electronic throttle system and suppress the nonlinear phenomenon caused by friction and other factors,a composite controller based on model reference adaptive control(MRAC)and extended state observer(ESO)is designed,and the stability of closed-loop system is proved according to input-to-state stability theory.The simulation and experimental results show that the designed composite controller not only can solve the problem of poor control performance caused by system parameter uncertainty,but also has stronger anti-disturbance ability.It can make the electronic throttle system achieve fast and accurate position tracking control.