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The following specification described a method or system of correcting locomotive wheel slip in which each driven wheel provides a wheel velocity signal proportional to its angular velocity. This signal is compared in a wheel slip detection circuit for each wheel with a train speed signal to derive

The following specification described a method or system of correcting locomotive wheel slip in which each driven wheel provides a wheel velocity signal proportional to its angular velocity. This signal is compared in a wheel slip detection circuit for each wheel with a train speed signal to derive a signal corresponding to the difference in the event of wheel slip. This difference signal is differentiated to provide a signal corresponding to the acceleration and multiplied by a signal corresponding to the slipping wheel speed to provide a correction signal corresponding to the power lost in the slipping wheel.The wheel velocity signals are compared in a "less than" and a "greater than" circuit respectively to derive the train speed signal and the slipping wheel signal.The correction signal is utilized for controlling the current in the field windings of the main generator of a diesel electric locomotive to reduce the power by a factor corresponding to the power lost in the wheel slip and to initiate the application of sand to the track in the event the train speed is low or the slip is repetitive.An override relay is also operated by the correction signal to control the conventional override solenoid to reduce the generator output and thereby enable the governor to reduce the engine fuel supply.The correction signal is also used for controlling the storage of the train speed signal to retain a record or memory of the train speed so that the correction signal is always properly derived irrespective of the number of slipping wheels.

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