Electronic control system for multiple ratio transmission includ

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74866, B60K 4124, B60K 4106

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active

051576082

ABSTRACT:
A control system for an automatic transmission for an automative vehicle having a torque converter and a combustion engine including a microprocessor that is adapted to establish optimum control pressure levels for fluid pressure operated clutch and brake servos that effect gear ratio changes wherein provision is made for adjusting system pressures to maintain ratio shift quality in accordance with variations in a plurality of control sensor inputs including vehicle deceleration during ratio shifting and changes in the rate of change of converter turbine speed wherein optimum servo pressures are maintained following a ratio shift and during a ratio shift as torque capacity of one servo is reduced in synchronism with a torque capacity increase for a companion servo.

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