Patent ID: 8280568

Claim:
An electric train car controlling device comprising a controlling unit that generates a target torque command value for a plurality of motors to suppress an idling state of driving wheels based on revolving speeds of the motors that drive a plurality of driving wheel axles, wherein the controlling unit comprises: a first judging unit that obtains, by use of self-axle speeds that are the revolving speeds of the motors and a reference speed that is a minimum speed of the revolving speeds of the motors, a speed deviation of each of the self-axle speeds from the reference speed and an acceleration deviation, and judges a degree of the idling state of the driving wheels in accordance with how much the thus obtained speed deviation and the acceleration deviation exceed thresholds that are individually determined; a limiting process performing unit that performs a limiting process to reduce an instruction torque command value that is externally supplied, in accordance with a judgment result obtained by the first judging unit; a second judging unit that determines a first threshold that exceeds an absolute acceleration determined in accordance with a vehicle usage condition with reference to the absolute acceleration, and judges whether an acceleration of a self-axle speed that is the maximum speed selected from the revolving speeds of the motors exceeds the first threshold; and an output processing unit that outputs a torque command value processed by the limiting process performing unit as the target torque command value when a judgment result obtained by the second judging unit is “not exceeding the first threshold”, and outputs the target torque command value subjected to a reduction process that is performed regardless of a process result obtained by the limiting process performing unit when the judgment result obtained by the second judging unit is “exceeding the first threshold”.