Control system for a direct-coupling mechanism in hydraulic...

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

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74/105

F16H 39/00 (2006.01) F16H 61/14 (2006.01)

Patent

CA 1230989

ABSTRACT OF THE DISCLOSURE In a transmission for an automotive vehicle, a control system for a direct-coupling mechanism for mechanically engaging input and output members of a hydraulic power transmission means. Operating fluid pressure regulating means controls operating fluid pressure applied to a hydraulically operating portion of the direct-coupling mechanism, and the direct-coupling mechanism applies an engaging force corresponding to the operating fluid pressure thus controlled to the input and output members. Vehicle speed sensor means detects the speed of the vehicle, and slip sensor means detects the value of a predetermined parameter indicative of an amount of relative slip between the input and output members. When the detected vehicle speed falls between a first predetermined value and a second predetermined value larger than the first predetermined value and at the same time the detected value of the predetermined parameter is outside a predetermined range, control means causes the operating fluid pressure regulating means to vary the magnitude of the operating fluid pressure so that the predetermined parameter falls within the predetermined range.

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