Research On Modeling And Advanced Control For Electronic Throttle Valve System

Throttle valve is the valve which controls the air flow into the engine,and the rate of flow is controlled by the angle of the plate.The ratio of fuel to air should be different in different working condition when the vehicles run,so that the fuels could be fully burnt and the engine runs in high sufficiency.Electronic throttle valve is a new type,and the plate is driven by a DC motor.At the same time,the angle of the plate could be checked by a sensor embedded in the body,so that it could be controlled by the electronic system in the vehicle.This paper mainly introduces some advanced control methods for electronic throttle valve system and complete the simulation and experimental validation.The mechanical structure and the electronic principle of the electronic throttle valve are introduced in the beginning of this paper,and the mathematic model is built based on the analysis of the characteristics of the electronic throttle valve.We firstly design a traditional PI controller,but it is shown in the analysis that the system performance decreases with friction and external disturbance.Accordingly,a compound control design based on disturbance observer(DOB)is introduced.In this control design,the disturbance of the system is observed by disturbance observer and the corresponding feed forward compensation is designed.The comparison will be shown in the simulation and experiment.For the sake of better performance in dealing with parameter uncertainty and disturbance,disturbance observer based sliding mode controller(SMC)is designed for the electronic throttle valve system.The robustness and anti-disturbance performance are increased by sliding mode controller.With disturbance observer and feed forward compensation,the switching gain could be selected just greater than the boundary of the estimation error,which decreases the chattering phenomenon caused by high switching gain.Based on the traditional sliding mode control,we introduce nonsingular terminal sliding mode control for better performance.This control design makes the system error converges to the equilibrium point in finite time,which increases the performance in convergence of closed loop system.