CONTROL SYSTEM FOR MAINTAINING TRACTION IN A ROLLING STOCK

摘要

: An improved control system ensures more effective utilization of the frictional force between the wheels of rolling stock and the rails. From a peripheral velocity vM of a driving wheel and a vehicle velocity v, the rate of change .DELTA.vs/.DELTA.t of the relative velocity vs with respect to time is obtained. The rate of change .DELTA.f/.DELTA.t of the traction force f produced in the driving wheel at that time is obtained from a detected armature current of a motor driving the driving wheel. The driving torque produced by the motor is so controlled as to decrease when the polarities of the rate of change of the relative velocity and that of the traction force are different from each other.