Method of controlling hydraulic pressure for an automatic transm

Details Method of controlling hydraulic pressure for an automatic transm Method of controlling hydraulic pressure for an automatic transm

1987-06-26

1989-03-21

Wright, Dirk

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74861, 74867, 3644241, B60K 4104

Patent

active

048133078

ABSTRACT:
A method of controlling the hydraulic pressure for an automatic transmission gear system, in which the actual rotation speed of a rotatable element during a speed shift from, for example, the 1st speed ratio to the 2nd speed ratio is detected, and the hydraulic pressure supplied to a frictional engaging element acting to change the rotation speed of the rotatable element is controlled so that the rate of change of the rotation speed of the rotatable element can converge to a predetermined change rate when the speed change rate due to the speed shift is ideal. On the other basis of the hydraulic pressure supplied to the frictional engaging element in the final state of the speed shift, the initial hydraulic pressure to be supplied to the frictional engaging element immediately after starting of the next speed shift is computed. Such a trial is repeated a plurality of times so that an automatic transmission whose operating hydraulic pressure is not primarily designed to meet the operation of an engine from the aspect of the capacity can be adapted to operate with the engine.

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