Controlling a gear ratio in a continuously variable...

F - Mech Eng,Light,Heat,Weapons – 16 – H

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F16H 61/08 (2006.01) F16H 59/06 (2006.01) F16H 61/21 (2006.01) F16H 61/24 (2006.01) F16H 61/66 (2006.01)

Patent

CA 2564321

This invention provides a method for controlling a gear ratio in an automatic transmission of a vehicle. The method includes detecting a desired engine braking condition associated with the vehicle. Once the engine braking condition is determined, a decay factor is determined for reducing the gear ratio of the transmission. The decay factor maintains the gear ratio for a delayed period of time before gradually reducing the gear ratio over time. After determining the decay factor, the gear ratio of the transmission is controlled in accordance with the decay factor.

Cette invention concerne un procédé de commande d'un rapport de vitesse dans une transmission automatique d'un véhicule. Le procédé comprend la détection d'une condition de freinage de moteur souhaitée associée au véhicule. Une fois que la condition de freinage de moteur est déterminée, un facteur de décroissance est déterminée pour réduire le rapport d'engrenage de la transmission. Le facteur de décroissance maintient le rapport de démultiplication pour une période retardée avant de réduire progressivement le rapport d'engrenage avec le temps. Après la détermination du facteur de décroissance, le rapport d'engrenage de la transmission est commandée en fonction du facteur de décroissance.

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