The Study Of High-speed Train Braking Force Re-distribution Methods

At present, separate power is the development trend of high-speed train power allocation. Compare with Centralized Power, it has obvious advantages in speed increasing, energy saving and environmental protection. So it is used in our high-speed trains. Power cars provide traction\braking force in CRH2A EMU. If a power car slides, the brake force distribute to other cars in the braking unit, which may lead to trailer car providing the brake force, while the regeneration braking force of other power car is not fully utilized. The trend of braking force distribution is reasonable distribution in the whole train. There are many trains using this distribution, but the specific method does not making public.This paper discusses the distribution method of braking force in the whole train and then ensures every car working well.This paper establishes anti-slip re-adhesion control simulation, which uses actual parameters of CRH2A EMU. How to distribute the vehicle braking force after sliding is the keystone and difficulty of this study. The method is based on the vehicle creep speed to estimating the vehicle track conditions, and then the brake force is distributed according to the vehicle track conditions. This paper proposes four braking force distribution methods under the basic thread and compares them in various kinds of vehicle track conditions. Finally, the basic allocation methods are combined into a method which can be applied to various track conditions. The model is built based on MATLAB to validate the feasibility of control strategy of brake force distribute in this paper.