Traction/Braking Control of High Speed Trains Based Active Antiskid Constraints

Wheel skid of high-speed trains (HSTs) not only causes severe rolling wear or fatigue damage of actuation wheel sets, but also degrades adhesion reliability of wheel-rail systems. However, antiskid issue is rarely incorporated into an unified compatible framework with traction/braking control design since adhesion control and traction/braking control are usually considered as two independent processes. In this work, an active antiskid constraint based adaptive traction/braking control scheme is developed, in which the antiskid boundary condition is directly introduced into traction/braking control design, such that the creep rate of wheel-rail systems never exceeds a given empirical antiskid boundary during the whole traction/braking process, at the same time precise speed tracking is guaranteed.