The Research On Intelligent Braking Control Technology Of Heavy-haul Train

Train braking is one of chief problems to be solved for heavy-haul transport. Freight railway is equipped with conventional air brake systems and used with the locomotive synchronization brake in China, but it has some problems that the braking command delay limited the length of train marshalling and the capability of adapting complex environment is not well. For the deficiencies of synchronization brake, a new locomotive braking control method, which was executed according to the local track situation and coupler force value was proposed. It would be used to relief the longitudinal force between cars via controlling the locomotive braking.The locomotive electric braking force can export in fuzzy control method, according to the characteristic of locomotive electric brake. The fuzzy control rules were formulated depending on the coupler force of heavy-haul on complex ramp. With analyzed the train longitudinal dynamics. The mathematical model of train longitudinal dynamics has been established. The dry friction buffer has been introduced, and the mathematical modeling of the MT-2buffer has been modeled. It has been proved that the mathematical modeling of the MT-2buffer is accurate by the calculated values contrast to the experimental values. The brake cylinder pressure was simulated when the train was braking. The model of20000-ton combined heavy haul train was established in MATLAB/SIMULINK software. The couple force model, the air brake system model and the fuzzy control of locomotive electric brake model ware described in detail.This paper also simulated heavy-haul train on different rail lines with different conditions. The simulation results theoretically prove that, compared with current locomotives braking, the locomotive intelligent braking can reduce maximum coupler force and increase the safety of trains running. The simulation provides a theoretical basis for the development of locomotive smart brake technology.