Research On Position Accurate Control Of Gearshift Actuator For Mechanical Automatic Transmission

With the continuous reduction of petroleum resources,fuel-efficient vehicles are increasingly favored by the state and public.However,in terms of energy consumption,the efficiency of the automotive transmission system directly plays a decisive role.The mechanical automatic transmission(AMT)adds a set of electronic mechanical equipment on the basis of the traditional manual transmission,and automatically selects the gear shift action according to the mature shifting rules.It inherits the advantages of traditional manual transmission,has the advantages of simple structure,low manufacturing cost,high transmission efficiency and obvious fuel economy,and is increasingly favored by automobile manufacturers.However,the mechanical automatic transmission generates power interruption during shifting,which seriously affects the shift quality of the automobile.The main reason for this problem is that the shift time is too long.In response to this problem,this article focuses on the precise position control of the shift actuator of the mechanical automatic transmission,The main contents are as follows:The AMT test bench that I just purchased from the research room was the subject of research.In order to build an accurate mathematical model of the AMT shift selector actuator,first of all,the equipment of the selected shift actuator is disassembled.According to the internal transmission structure of the system,the simple diagram of the system is drawn and the force analysis is made.Then,based on Kirchhoff’s Law and Newton’s Second Law and other actuators,a mathematical model of the shift actuator is built.Because the parameter value in the model is unknown,in order to obtain the real and effective parameter value,the parameter experiment was performed on the AMT experimental bench.Finally,the precise mathematical model of the AMT selected shift actuator was obtained.Due to the influence of the uncertain parameters such as the variation of the internal parameters of the shifting gear motor and the external gear shifting resistance,the AMT shift transmission actuator system will make the shift time longer and greatly reduce the shifting quality.To solve this problem,this paper presents a dynamic sliding mode auto-disturbance rejection control algorithm.It can use the internal expansion state observer to observe the uncertainties existing in the system as total disturbances and eliminate the influence of the disturbances in the form of disturbance compensation.At the same time,the internal dynamic sliding mode control algorithm has a very good speed and robustness.Applying the dynamic sliding mode auto-disturbance rejection control algorithm to the position control of the AMT selected shifting actuator can greatly reduce the shift time and eliminate the power interruption,thereby improving the shift quality of the car.In order to verify the feasibility of the dynamic sliding mode ADRC,the simulation experiment and bench test are carried out with the dynamic sliding mode controller and the traditional PID controller respectively.The dynamic sliding mode auto-disturbance rejection controller does have a certain advantage in controlling the positional control of the AMT selector shift actuator.By analyzing and comparing the data,the dynamic sliding mode auto-disturbance rejection controller does have a certain advantage in controlling the positional control of the AMT selector shift actuator.