Method of and apparatus for the combined detection of speed...

B - Operations – Transporting – 60 – T

Patent

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B60T 8/70 (2006.01) B60T 8/17 (2006.01) B60T 17/22 (2006.01)

Patent

CA 2123754

A method of and an apparatus for controlling wheel slip in a railway vehicle brake system which includes: determining whether the axle rate is in the slippage range, and generating a first output logical signal indicative thereof; comparing the axle rate and the first output logical signal to determining an energy summation value indicative of the wheel/axle set's loss of energy due to braking wheel slippage, and generating an energy summation signal indicative thereof; determining an energy loss limit and generating an energy loss limit signal at which wheel slippage has little potential for self correction; comparing the energy summation signal and the energy loss limit signal to generate a second logical output signal indicative of whether the wheel/axis set is in a slip condition that needs correction; comparing the axle rate signal, the energy summation signal and the second logical output signal to generate a wheel slip intensity signal; converting the wheel slip intensity signal to a command signal; and utilizing the command signal in a force modulation interface to vary the rate of braking force reduction.

Cette invention concerne un procédé et un dispositif destinés à éviter le glissement des roues d'un véhicule ferroviaire lors du freinage et comportant les actions suivantes : déterminer si la vitesse de rotation de l'essieu se situe dans la plage d'enrayage et générer un premier signal logique de sortie correspondant; comparer la vitesse de rotation de l'essieu et le premier signal logique de sortie pour déterminer une valeur représentant la perte d'énergie de l'ensemble roues-essieu attribuable à l'enrayage, et générer un signal correspondant; établir une limite admissible de perte d'énergie au-delà de laquelle une autocorrection de l'enrayage est peu probable et générer un signal correspondant; comparer le signal de perte d'énergie et le signal de limite admissible de perte d'énergie pour générer un deuxième signal logique de sortie indiquant si l'enrayage de l'ensemble roues-essieu appelle une intervention; comparer le signal de vitesse de rotation de l'essieu, le signal de perte d'énergie et le deuxième signal logique de sortie pour générer un signal d'intensité d'enrayage; transformer le signal d'intensité d'enrayage en un signal de commande; utiliser le signal de commande dans un interface de modulation d'effort de freinage pour faire varier l'action de freinage.

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