CONTROL APPARATUS FOR MAINTAINING TRACTION IN ELECTRIC ROLLING STOCK

摘要

In control apparatus for maintaining the traction of rolling stock, e.g. an electrically powered rail vehicle, the commencement of a developing period of slip is detected by the fact that a time-differential value vs of a creep velocity vs (a relative velocity between a peripheral velocity vm of a driving wheel and a vehicle velocity vt) exceeds a predetermined reference .delta.1. The termination of this developing period is detected by the fact that a time-differential value vm of the peripheral velocity vm becomes equal to zero. During the developing period, a torque command Tp to a main motor controller is decreased by a re-adhesion control signal Tfa which is formed by the combination of a time-dependent component e1 and a slip-dependent component e2. After termination of the developing period, the torque command Tp is decreased with time at an appropriate time constant. According to the present invention, the arithmetic logic operation for control can be greatly simplified, without deterioration of the adhesion performance of the vehicle.