Vehicle automatic transmission control system

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

Patent

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F16H 59/00 (2006.01) F16H 61/02 (2006.01) F16H 61/662 (2006.01) F16H 61/00 (2006.01) F16H 61/684 (2006.01)

Patent

CA 2077096

A system for controlling a multi-step geared or continuously variable automatic transmission in which a gear ratio to be shifted to is determined by retrieving a conventional preestablished shift diagram by an engine load and a vehicle speed. A fuzzy reasoning is carried out using parameters such as a driving resistance to correct the gear ratio obtained by retrieved. Alternatively, the fuzzy reasoning is carried out to correct one of the engine load and vehicle speed detected and using the corrected value, the shift diagram is retrieved to determine a gear ratio to be shifted to. Further, another fuzzy reasoning is carried out to ascertain the driver's intention to decelerate and the first fuzzy reasoning is carried out using the inferred value so as to reflect the driver's intention in the shift control.

Système de contrôle d'une transmission automatique à changement de vitesse continu ou à engrenage multipas. Le rapport d'engrenage de la transmission est déterminé par un schéma de changement de vitesse classique et préétabli selon la charge du moteur et la vitesse du véhicule. On se sert de la logique floue, selon des paramètres comme la résistance d'engrenage, afin de modifier le rapport d'engrenage obtenu. On peut aussi avoir recours à la logique floue pour modifier la charge du moteur ou la vitesse du véhicule détectée. € l'aide des valeurs corrigées, le schéma de changement de vitesse est produit afin d'établir le rapport d'engrenage devant être suivi. On a recours à un autre processus de logique floue pour vérifier l'intention du conducteur de ralentir. Le premier processus de logique floue est suivi en utilisant la valeur inférée, afin de refléter l'intention du conducteur en ce qui touche le contrôle du changement de vitesse.

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