Hydraulic control system of an automatic transmission for a...

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

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Details

F16H 61/28 (2006.01) F16H 61/02 (2006.01) F16H 61/04 (2006.01)

Patent

CA 2213006

Disclosed is a hydraulic control system of an automatic transmission for a vehicle which includes a pressure regulator for regulating hydraulic pressure created by an oil pump, manual and automatic shift controllers for forming a shift mode according to a position of a shift selection lever, a hydraulic controller for controlling shift quality and shift response to smoothly change transmission speeds when shifting, and a hydraulic pressure distributor and release mechanism which distributes an appropriate amount of hydraulic pressure to and releases pressure from each of the friction elements in the automatic transmission, wherein the hydraulic distribution and release means has a 2-4/3-4 shift valve, a 2-3/4-3 shift valve, and an end-clutch valve for supplying to or releasing from friction elements hydraulic pressure, controlled by first and second pressure control valves of the hydraulic pressure controller, through port conversion realized by control pressure, supplied to lines for each speed through a shift control valve operated according to ON/OFF states of solenoid valves by a transmission control unit, the 2-3/4-3 shift valve being connected to a line to which an exhaust port provided with an orifice is installed.

Système de commande hydrostatique pour boîte de vitesses automatique de véhicule automobile, comportant un régulateur de pression pour régulariser la pression hydraulique provenant d'une pompe à huile, des commandes d'embrayage automatique pour former un mode d'embrayage en fonction de la position d'un levier de vitesses, un dispositif de commande hydraulique pour contrôler la qualité et la rétroaction des changements de vitesses pour accroître la souplesse de l'embrayage; un distributeur de pression hydraulique et un mécanisme de déclenchement pour assurer la distribution et l'interruption de la pression hydraulique appropriée vers les éléments d'embrayage, le distributeur et l'interrupteur de pression étant dotés de soupapes de changement de vitesses 2-4/3-4, 2-3/4-3; une soupape d'embrayage assure le contrôle du niveau de pression hydraulique pour les éléments d'embrayage, sous le contrôle de vannes de régulation de la pression hydraulique par conversion réalisée par contrôle de la pression acheminée par une valve de commande d'embrayage commandée par le statut de marche/arrêt d'électrorobinets; les soupapes de changement de vitesse 2-3/4-3 sont reliées à une canalisation munie d'un orifice d'échappement.

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