Hydraulic control for a transmission

Details Hydraulic control for a transmission Hydraulic control for a transmission

F - Mech Eng,Light,Heat,Weapons

16

H

74/137

F16H 61/02 (2006.01)

Patent

CA 1128778

C-3126 HYDRAULIC CONTROL FOR A TRANSMISSION Abstract of the Disclosure: A hydraulic control for an automatic transmission has a plurality of shift control valves for con-trolling the interchange of drive ratios within the transmission. The shift control valves each have a control chamber subjected to substantially constant pressure and a shift control chamber having an area proportional to the respective control chamber which is subjected to a variable control pressure. The variable control pressure is controlled at discrete levels by a single pulse width modulator (PWM) solenoid. The respective area ratios of the shift control chambers to the controlled chambers determines the distinct shift point of each shift valve.

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