Abstract
The traction force of heavy-duty locomotive is reduced significantly and unable to fulfill the actual traction demand when the wheel slip phenomenon occurs. Aiming at this problem, an adhesion control method is proposed in this paper. The proposed method achieves online search of optimal traction torque based on adhesion coefficient-slip ratio relationship which is analyzed using Polach model. The optimal traction torque is the maximum torque which is operating under current wheel-rail condition without slip phenomenon. The proposed method detects wheel slip phenomenon by wheel slip velocity and wheel acceleration. Each axle in locomotive achieves individual traction torque adjustment by utilizing the advantage of axle control system. Considering the complexity of real heavy-duty locomotive, a co-simulation model is proposed by using MATLAB/Simulink to build the electric power circuit and control system as well as SIMPACK to build the locomotive mechanical system. The simulation is realized based on the StarSim real-time simulator platform and the experimental results verify the effectiveness of the proposed method.
Highlights
With the rapid development of heavy-duty transportation, the requirements for traction performance and transportation capacity of heavy-duty locomotives are increasing [1]
Based on the advantages of axle traction control system, this paper proposes an adhesion control method which online searches of the optimal traction torque
The method considers the advantage of the axle traction control system
Summary
With the rapid development of heavy-duty transportation, the requirements for traction performance and transportation capacity of heavy-duty locomotives are increasing [1]. When the force generated by the traction torque is over the maximum adhesion force that the rail can provide, the wheel slip phenomenon occurs. Through the multi-body software, the interaction among locomotive mechanical structure is accurately simulated in longitudinal, transverse and vertical direction It makes the wheel-rail dynamic behavior close to the actual working condition. Maintaining the operation point at the adhesion area, especially near the peak point, is the key factor to avoid the wheel slip phenomenon and obtain the optimal traction performance. Based on the advantages of axle traction control system, this paper proposes an adhesion control method which online searches of the optimal traction torque. Based on the above classification, the searching axle searches the optimal traction torque, which is the maximum torque operating under current wheel-rail condition without slip phenomenon.
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