Anti-Slip Control Of Heavy-Haul Locomotive Based On Optimal Creep Ratio

Heavy-haul locomotives are one of the key development products determined by the national strategy.Raising the utilization ratio of wheel-rail adhesion is the main way to improve the traction performance of locomotives.Because of the complexity and diversity of operating conditions,the traction power of heavy haul locomotives depends mainly on the adhesion between wheels and rails.Therefore,to ensure the stable operation of locomotives,in order to maximize the traction force of the traction system.Experiments show that: The actual adhesion coefficient of locomotive is a function of creep ratio of locomotive.The cohesion coefficient can reflect the change of cohesion.By using the extremum search algorithm,the optimal slip ratio is searched in real time.By controlling the traction force of locomotive,the locomotive runs at the optimal working point,thus improving the locomotive adhesion utilization rate and the locomotive traction power.At present,the modern adhesion control method realizes real-time searching for the optimal adhesion point under different rail surfaces.Through the real-time control of locomotive driving torque,the locomotive works near the optimal adhesion point.This kind of control method also effectively prevents the locomotive from idling and improves the locomotive traction.It is of great practical significance in engineering.The main research work of this paper is as follows:Aiming at the problem of idling of heavy haul locomotive wheelset and effective exertion of locomotive traction,an integral sliding mode protection method based on optimal creep ratio is proposed to control anti-aircraft rotation.Firstly,the dynamic model of Heavy-haul locomotive is established,and the sliding mode observer is designed to observe the real-time adhesion coefficient of Heavy-haul locomotive;secondly,the sliding mode search algorithm is used to monitor and search the optimal area of creep ratio,and combined with PID control to weaken the oscillation problem in sliding mode extremum search;finally,a new approach rate integral sliding mode controller is designed to make locomotive transport easier.When traveling on different rail surfaces,the creep ratio is in the optimal value,which can make the greatest use of the adhesion between locomotive wheels and rails.The simulation results also verify the feasibility and effectiveness of this method in locomotive anti-aircraft traction system.Aiming at the chattering problem in the sliding mode extremum search algorithm,a single parameter perturbation extremum search method is proposed.Firstly,the stability of this search method is proved by mathematical theory;secondly,by analyzing the adhesion characteristics of wheel-rail surface,the optimal adhesion coefficient is searched in real-time at different rail surfaces;finally,a non-singular terminal sliding mode controller is designed to prove its robustness and fast convergence speed.At the same time,the simulation results are compared with the traditional sliding mode controller.It is verified that the non-singular terminal sliding mode control method based on single parameter perturbation extremum search for optimal creep ratio effectively weakens the chattering of traction system,and also reduces the shortcomings of the sliding mode extremum search algorithm and speeds up the search speed.