Anti-Skid Control Based on Adhesion Force Observer for Train Pneumatic Braking

Abstract:

To solve the problem of skidding due to the deterioration of adhesion conditions during train braking， a novel anti-skid control method based on adhesion force observer was proposed. Using the observer to observe the use of adhesion force in real time during braking， and based on the slip ratio of the wheelset and the deceleration of the vehicle， an anti-skid controller was designed to control the wheel slide. The Polach model was used to simulate the wheel-rail adhesion force to verify the controller. The results show that the anti-skid control method proposed can accurately observe the use of adhesion force under the conditions of continuous low adhesion and two-step changes in adhesion. Besides， the degree of sliding of the wheelset can be effectively controlled and a better use of adhesion is realized. During the anti-skid process， this controller can also modify the braking force continuously， so that the brake cylinder pressure can be adjusted smoothly， which avoids frequent and cycled charging and discharging of compressed air.

Key words:train braking;anti-skid control;adhesion force observer;disturbance observer;pneumatic braking