Hydraulic bypass to back pressure chamber of a clutch accumulato

Details Hydraulic bypass to back pressure chamber of a clutch accumulato Hydraulic bypass to back pressure chamber of a clutch accumulato

1994-08-03

1996-10-15

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477150, F16H 5908, F16H 6108

Patent

active

055650015

ABSTRACT:
A control apparatus for a hydraulically operated vehicular transmission having a plurality of hydraulic engaging elements has an accumulator which is connected in parallel with a hydraulic engaging element for a low-speed transmission train and a back pressure generating source which generates a hydraulic oil pressure to be supplied to a back pressure chamber of the accumulator. The control apparatus includes a changeover valve which can be changed over between a first position in which the back pressure chamber of the accumulator and the back pressure generating source are brought into communication with each other and a second position in which the communication is cut off to lower a pressure in the back pressure chamber. The changeover valve is arranged to be changed over from the second position to the first position when a hydraulic oil pressure in the hydraulic engaging element for the low-speed transmission train has exceeded a predetermined pressure.

REFERENCES:
patent: 4709597 (1987-12-01), Yasue et al.
patent: 4791568 (1988-12-01), Hiramatsu et al.
patent: 5010787 (1991-04-01), Takada et al.
patent: 5136898 (1992-08-01), Hirose
patent: 5366420 (1994-11-01), Kuriyama et al.
patent: 5397284 (1995-03-01), Matsumoto et al.
patent: 5431608 (1995-07-01), Hirose

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