A system and a method for the control of variable-ratio...

B - Operations – Transporting – 62 – M

Patent

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B62M 25/08 (2006.01)

Patent

CA 2382424

A system for controlling a variable-ratio transmission is mounted on an apparatus (1) and associated with an actuator (2) for changing the transmission ratio, as well as operating means (3) for applying an input driving force to the transmission with a periodic action of given frequency. The system comprises first sensor means (5) which are sensitive to the driving force and can generate a respective first signal, second sensor means (6) which are sensitive to the speed of operation of the apparatus (1) and can generate a respective second signal, as well as a control device (4) which is sensitive to the first and second signals and can control the actuator (2) in dependence on the first and second signals. The control device (4) is configured to determine, from the first and second signals, a reference signal indicative or a reference value of the frequency (CR). This reference signal is compared with a third signal (7) indicative of the given frequency so as to identify a corresponding deviation signal (e). The control device (4) acts on the actuator (2) in order to change the transmission ratio so as to minimize the deviation signal (e).

L'invention concerne un système de commande d'une transmission à rapport variable monté sur un dispositif (1) et associé à un actionneur (2), servant à changer le rapport de la transmission, ainsi que des moyens de commande (3) destinés à appliquer une force d'entraînement à la transmission avec une action périodique de fréquence donnée. Ce système comprend un premier élément (5) de détection sensible à la force d'entraînement et pouvant générer un premier signal correspondant, un second élément (6) de détection sensible à la vitesse de fonctionnement du dispositif (1) et pouvant générer un second signal correspondant, ainsi qu'un dispositif de commande (4) sensible au premier et au second signal et pouvant commander l'actionneur (2) en fonction de ces derniers. Le dispositif de commande (4) est conçu afin de déterminer, à partir du premier et du second signal, un signal de référence indicatif d'une valeur de référence de la fréquence (CR). Ce signal de référence est comparé à un troisième signal (7) indicatif d'une fréquence donnée, de manière à identifier un signal d'écart (e) correspondant. Le dispositif de commande (4) agit sur l'actionneur (2) afin de changer le rapport de la transmission en minimisant ledit signal d'écart (e).

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