Research and application of adhesion optimization control in the traction system of permanent magnet high-speed EMU trains

Abstract When the permanent magnet high-speed Electrical Multiple Unit (EMU) train runs at extremely high speeds, it is necessary to solve the problem of optimal exertion of wheel-rail adhesion to ensure the adhesion utilization rate of the train and the smooth and safe operation of the vehicle. To improve the adhesion utilization rate of the train and passenger comfort, this paper proposes an adaptive adhesion utilization control strategy for permanent magnet high-speed EMU trains. This method automatically identifies the wheel-rail state, matches the wheel-rail adhesion characteristics, automatically adjusts the adhesion control parameters according to the wheelset idling and sliding state, reduces the fluctuation range of traction force, improves the stability of traction force exertion and effectively improves the adhesion utilization control performance of the permanent magnet high-speed EMU train. Both simulation and experimental tests demonstrate this method's superiority over traditional control methods. It has been shown to enhance adhesion utilization efficiency by over 5% and to significantly narrow the traction force adjustment range by more than 10%. It also improves passenger comfort indicators such as train stability and comfort, and enhances the safety of train operation.