Research On Electronic Throttle Valve Based On Sliding Mode Control

In 2009,China became the world's largest producer and seller of automobiles.Under the background of huge car ownership,it has become a serious problem for researcher that how to reduce vehicle emissions effectively and improve the fuel utilization rate.At the same time,consumers are increasingly pursuing a safer,more comfortable ride experience.Nowadays,the advanced automotive engine management system is widely used in automotive to reduce vehicle emissions and improve vehicle control performance.Throttle valve control system is the "throat" of the engine,which is a key part of the car engine for controls the air into the car engine.Achieving the goal of control the air into the engine rapidly and precisely can be of great significance to improve engine management system performance.In order to achieve accurate and rapid control of the throttle valve,at first,we need to establish the mathematical model for it.In this thesis,taking electronic throttle valve,which is produced by UEAS,for example,the mechanical structure and working principle of electronic throttle valve control system was introduced detailly.Meanwhile,the nonlinear factors existing in the electronic throttle control system were analyzed and the nonlinearity mathematical model were built.Lastly,by establishing the mechanical characteristic equation and the electrical characteristic equation of the electronic throttle control system,we deduced the state equation of the electronic throttl.Sliding mode control method has strong robustness and anti-jamming for the uncertain and unmodeled dynamics in the system.Considering the uncertainties exists in the electronic throttle valve control system,sliding mode control method was adopted for the electronic throttle valve in this thesis.Firstly,five kind of controller such as linear sliding mode controller,terminal sliding mode controller,non-singular terminal sliding mode controller,fast terminal sliding mode controller and non-singular fast terminal sliding mode controller were designed successively based on the mathematical model of electronic throttle valve.Secondly,the stability of each controller is proved by the Lyapunov stability theory,and the time that the system state from any position converge to the equilibrium position is calculated.Finally,extend state observer was used to estimate the unmeasurable variable in control law.To verify the five-controller's dynamic performance,a simulation model was built in MATLAB/Simulink.In this model,the controller,the control object and the state observer were encapsulated by using S function.Four expected signals were used to test the tracking performance of five controllers.The simulation results show that the non-singular fast terminal sliding mode controller for electronic throttle valve can meet the requirements of fast response speed and high control precision.At the same time,the robust performance of the non-singular fast terminal sliding mode controller was verified by the perturbation simulation experiment.According to the simulation results in above,the nonsingular fast terminal sliding mode control method can meet the requirements of electronic throttle valve.