Method of controlling locomotive wheel slip

Details Method of controlling locomotive wheel slip Method of controlling locomotive wheel slip

G - Physics

05

D

341/72

G05D 13/02 (2006.01) B60L 3/10 (2006.01) G05D 13/62 (2006.01) F02B 3/06 (2006.01)

Patent

CA 1037591

METHOD OF CONTROLING LOCOMOTIVE WHEEL SLIP Abstract of the Disclosure A method and apparatus are disclosed for controlling the wheel slip of an electric or diesel electric locomotive such that optimum wheel adhesion may be attained. A certain characteristic of a series traction motor, specifically the back emf per rpm versus motor current (E/n vs. I), forms the basis for a voltage control which limits the voltage (V) supply to each motor to a value which will limit the maximum percentage wheel slip. The selected limit value of wheel slip is great enough to encompass the conditions of maximum adhesion under most rail conditions. By combining the E/n with the motor IR drop, motor current, and a locomotive speed signal, the idealized voltage V for a non-slip condition is derived, This voltage is increased by a factor representing the desired maximum percentage slip to obtain the limiting voltage which may be supplied to the motor. A current maximizing circuit is included to decrease the allowed percent slip from the maximum preselected value to a value which provides the maximum motor current to obtain maximum traction.

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