Control system for automatic vehicle transmissions

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

Patent

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Details

F16H 61/26 (2006.01) F16H 61/06 (2006.01) F16H 59/42 (2006.01) F16H 59/68 (2006.01) F16H 59/72 (2006.01) F16H 61/684 (2006.01)

Patent

CA 2327889

A system for controlling an automatic transmission of a vehicle, wherein the hydraulic pressure to be supplied to the frictional engaging element such as a hydraulic clutch is determined, taking the performance of tracking or follow- up of the hydraulic pressure into account so as to enhance the control toughness against the engine speed change, thereby decreasing the shift shock effectively so as to improve the feeling of the vehicle occupant, while ensuring to prevent the engine from revving over or excessively. Further, the friction coefficient of the hydraulic clutch is calculated additionally taking parameters including the rotational difference thereof into account to determine the pressure to be supplied to the frictional engaging element, thereby further decreasing the shift shock effectively.

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