Adaptive Active Antiskid Traction/Braking Control Design Of High Speed Trains

High speed railway has become a research focus in traffic transportation field, at the same time people should pay more attention to safe and reliable operation with the improvement of train speed. Traction and braking system as one of the key subsystems in train operation process, its stability and antiskid performance are important factors that should be considered when design a high speed train controller.However, by summarizing the current theoretical research results and existing train systems, it is noted that most antiskid controllers are designed independently from the traction/braking unit. These methods are developed without considering the inherent interaction and correlation between antiskid and traction/braking unit, so when the traction/braking control design is addressed under the antiskid constraint, its control performance might be degraded, even influence the system stability and high speed trains’ operation safety.In this paper, the major work can be summarized as follows:(1) The antiskid constraint is directly linked with the development of traction/braking control system during modeling process, the active antiskid traction/braking control system of high speed trains realizes its control objective by tracking the desired wheel slip ratio;(2) A barrier Lyapunov function (BLF) based approach is utilized for this novel model, it can prevent possible wheel skid because of the transient performance during slip ratio tracking, by changing value of the BLF boundary parameter, the global antiskid operation (including the re-adhesion control) is realized using a hybrid control strategy;(3) To realize complete control design, using the adaptive method estimates parameters that are unmeasured, time-varying or can’t be modeled.Both theoretical analysis and numerical simulation validate the stability and effectiveness of the proposed control, all the required parameters can be measured by available means. It is shown that the proposed antiskid adhesion control is able to actively avoid possible wheel skid and improve the performance of traction/braking system, guaranteeing the train safety.