Control method of and system thereof for inversely proportionall

Details Control method of and system thereof for inversely proportionall Control method of and system thereof for inversely proportionall

1992-11-27

1994-11-29

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477143, 477131, F16H 540

Patent

active

053685318

ABSTRACT:
A method is provided for the control of servo hydraulic pressure in an automatic transmission. Servo hydraulic pressure is adapted to engage or release first and second frictional engagement elements arranged in such a relationship that, upon shifting from one particular speed stage to another, one of the first and second frictional engagement elements is released while the other is engaged. The servo hydraulic pressure, engaging one frictional engagement element, is linearly lowered in a torque phase during a shift so it releases the one frictional engagement element, responsive to a rise in the servo hydraulic pressure to the frictional engagement element to be engaged, to maintain an inversely proportional relationship between the servo hydraulic pressure being raised and that being released.

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