Research On Optimal Adhesion Control Method Of High-speed Train In Vehicle-controlled Mode

With the rapid development of high-speed railway in China,high-speed trains,as the core equipment of high-speed railway,have been rapidly developed in the continuous introduction,absorption and re-innovation.However,with the increasing speed of high-speed trains and the influence of complex road conditions,the adhesion between wheel and rail continues to decline,and the wheel is frequently idling,which is not conducive to the safe operation of trains.In order to suppress the wheel idling and improve the wheel-rail adhesion utilization ability during train operation,it is of great significance to study the adhesion control method suitable for high-speed trains for the stable and safe operation of trains.Based on the characteristics of high-speed train vehicle-controlled traction system,an optimized adhesion control method is designed,and the overall vehicle adhesion control is studied combined with the difference of adhesion ability between each wheel axle of each train.Firstly,the related adhesion mechanism of high-speed trains is introduced,and the uniaxial traction dynamic model and vehicle model of high-speed trains are built.An adhesion control method for on-line searching for the optimal traction torque is designed.By setting up a search vehicle to search for the optimal torque that adapts to the current rail surface conditions,the train runs stably in the high adhesion state as a whole,and the continuous idle rotation of the train under harsh rail surface conditions is avoided.Secondly,in the process of traction torque recovery,a cubic curve fitting recovery algorithm with adaptive slope adjustment is designed.By adjusting the slope of torque recovery in real time,the algorithm enables the train to quickly recover to the given torque or the optimal traction torque,and also avoids the occurrence of secondary idling.Compared with the simulation of the traditional adhesion control method,the effectiveness of the proposed method can be verified.Thirdly,according to the different adhesion utilization capacities of each motor vehicle and each axle of the high-speed train,and taking advantage of the independent control of traction torque of each motor vehicle in the vehicle-controlled traction system of high-speed train,based on the adhesion control method of the optimal torque search,an adhesion control algorithm of the overall vehicle after wheel set idling is designed.The simulation results show that the algorithm can improve the overall traction performance of the train.Finally,the semi-physical simulation platform of train adhesion control is built by using Modeling Tech semi-physical simulation equipment to verify the adhesion control method.The experimental results show that the method can effectively suppress the multiple air rotation of the train under the condition of bad track surface and maintain the stable operation of the train in the high adhesion state.