Shift control system for automatic transmission

Details Shift control system for automatic transmission Shift control system for automatic transmission

1988-10-31

1990-02-27

Bonck, Rodney H.

Machine element or mechanism

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

Preselected indexed position

475129, B60K 4110

Patent

active

049035495

ABSTRACT:
A hydraulic control system for an automatic transmission comprises a one-way valve arranged between a hydraulic line leading to a second speed apply chamber of a band brake and a hydraulic line leading to a fourth speed apply chamber of the band brake in such a manner as to allow fluid communication between them when a pressure dfferential takes place. The pressure differential takes place when the transmission upshifts from the first speed ratio to fourth speed ratio. Thus, during the 1-4 shift, a pressure build-up in the fourth speed apply chamber takes place in the same manner as a pressure build-up taking place in the second speed apply chamber under the control of a 1-2 accumulator valve.

REFERENCES:
patent: 4413536 (1983-11-01), Whitney et al.
patent: 4730521 (1988-03-01), Hayasaki et al.
patent: 4776240 (1988-10-01), Miki

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