Fluid control circuit of automatic transmission

Details Fluid control circuit of automatic transmission Fluid control circuit of automatic transmission

1997-02-13

1998-09-08

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

F16H 6106

Patent

active

058038671

ABSTRACT:
An automatic transmission has a friction element which induces a certain speed gear of the transmission when hydraulically operated. A fluid control circuit of the transmission comprises an accumulator valve unit which receives a line pressure for regulating a pressure of an operation fluid applied to the friction element in accordance with an engine load; and a shift valve which feeds the line pressure to the accumulator valve unit when assuming a first position and drains the operation fluid when assuming a second position. A flow restriction device is employed in the fluid control circuit for restricting the draining flow of the operation fluid.

REFERENCES:
patent: 3559669 (1971-02-01), Dach
patent: 3583422 (1971-06-01), Friedrichshafen et al.
patent: 4033203 (1977-07-01), Hirosawa et al.
patent: 4722250 (1988-02-01), Sumiya et al.
patent: 4843917 (1989-07-01), Van Selous et al.
patent: 4882952 (1989-11-01), Kashihara et al.
patent: 5095775 (1992-03-01), Ueki
patent: 5111719 (1992-05-01), Okahara
patent: 5478288 (1995-12-01), Sakakibara et al.

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