Method of controlling a continuously variable transmission

Details Method of controlling a continuously variable transmission Method of controlling a continuously variable transmission

B - Operations, Transporting

60

W

B60W 10/10 (2006.01) B60W 10/06 (2006.01) F16H 59/14 (2006.01) F16H 59/48 (2006.01) F16H 61/66 (2006.01) F16H 63/50 (2006.01)

Patent

CA 2520539

There is described a method of controlling a continuously variable ratio transmission of the type comprising a continuously variable ratio unit ("variator") which has rotary input and output members though which the variator is coupled between an engine and a driven component, the variator receiving a primary control signal and being constructed and arranged such as to exert upon its input and output members torques which, for a given variator drive ratio, correspond directly to the control signal, the method comprising: determining a target engine acceleration, determining settings of the variator's primary control signal and of an engine torque control for providing the required engine acceleration and adjusting the control signal and/or the engine torque control based on these settings, predicting a consequent engine speed change, allowing for engine and/or transmission characteristics, and correcting the settings of the control signal and engine torque based on a comparison of actual and predicted engine speeds.

La présente invention concerne un procédé qui permet de commander une transmission à changement de vitesses continu du type qui comprend une unité de changement de vitesses continu (<= variateur >=) comportant des organes d'entrée et de sortie rotatifs via lesquels le variateur est couplé entre un moteur et un composant entraîné, le variateur recevant un signal de commande primaire et étant construit et agencé de telle manière qu'il exerce sur ses organes d'entrée et de sortie des couples qui, pour un rapport d'entraînement de variateur donné, correspondent directement au signal de commande. Le procédé de l'invention consiste à : déterminer une accélération cible du moteur ; déterminer des réglages de signal de commande primaire du variateur et de la commande du couple moteur afin de fournir l'accélération moteur requise et adapter le signal de commande et/ou la commande du couple moteur sur la base desdits réglages ; prédire un changement de vitesse moteur conséquent, prenant en compte les caractéristiques du moteur et/ou de la transmission ; et corriger les réglages du signal de commande et du couple moteur sur la base d'une comparaison entre les vitesses de moteur actuelle et prédite.

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