Research On The Adhesion Control Mehtods Based On The Optimal Creep Rate

In recent years, with implementing of the applying high-speed and heavy locomotive strategies, especially the application of high-speed EMU, the adhesion control of the train becomes an important issue. Thus, it is important to study the adhesion control, and find ways to prevent or suppress the idling of the locomotive, and also improve the utilization of the locomotive traction. Based on the national support projects of science and technology, "Optimization of Traction Drive Control", the methods of adhesion control are studied in this thesis.Rolling contact with the adhesion theory is introduced in detail and then two models, Kalker linear theory model and Oldrich Polach adhesion model, about calculating adhesion are learned from foreign advanced adhesion theory.This thesis describes commonly used methods of judging the idling in detail. Based on the summary of the analysis, two adhesion control methods, including PD control method and method based on the optimal creep rate, are built in MATLAB/SIMULINK. Simulation results show that, compared to the previous method, adhesion control method based on the optimal creep rate, can work stably near the maximum adhesion coefficient and be full use of the adhesion force between wheel and rail.Finally, the thesis describes two groups of tests, including the constant torque test and the constant power test, with the help of the non-slip module of a locomotive traction drive control unit on the control platform of the locomotive. Each group of test carries out several tests with different degrees of idling. The results show that the torque and current of the motor decrease rapidly when the idling occurs. The change of the torque and current depends on the size of idling. Also the rotor flux of traction motor will be significantly in a weak magnetic zone when idling occurs. Then, the thesis analyzes the measured current and traction of the motor, which came from the experimental field. The waveform and the results of loop simuation are basically consistent with the results of this thesis, which shows that the control algorithm described in this thesis is feasible in the inhibition of locomotives idling.