Shift points control apparatus for an automatic transmission

Details Shift points control apparatus for an automatic transmission Shift points control apparatus for an automatic transmission

F - Mech Eng,Light,Heat,Weapons

16

H

74/144

F16H 61/02 (2006.01)

Patent

CA 1126987

ABSTRACT OF THE DISCLOSURE A shift points control apparatus for a hydraulic con- trol system of an automatic transmission, comprises a shift valve which includes separate switching and control valve elements arranged and movable in series with each other. The control valve element has different pressure acting areas to be acted upon by a fluid pressure when the control valve element is in the upshift and downshift positions, under kickdown condition and a pressure acting area to provide an upshift pattern of the transmission for part-throttle conditions of the engine, and a downshift valve having pressure acting areas to provide a down- shift pattern for the part-throttle conditions of the engine.

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