Shift control system for automatic transmission

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

1989-07-25

1991-04-09

Herrmann, Allan D.

Machine element or mechanism

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

Preselected indexed position

74867, B60K 4106

Patent

active

050054430

ABSTRACT:
A shift control system for an automatic transmission comprises a shift valve for an auxiliary gear train and an accumulator for low gear train. The shift valve includes a spool which is movable between a first position where the hydraulic fluid is supplied to a first passage and hydraulic fluid is discharged from a second passage, and a second position where the hydraulic fluid is supplied to the second passage and hydraulic fluid is discharged from the first passage. The accumulator includes a working pressure chamber and a back pressure chamber which is connected with a third passage or engine brake passage.

REFERENCES:
patent: 4485695 (1984-12-01), Kawamoto
patent: 4665774 (1987-05-01), Oguri
patent: 4700591 (1987-10-01), Yasue et al.
patent: 4730521 (1988-03-01), Hayasaki et al.
patent: 4781081 (1988-11-01), Shibata et al.
patent: 4817474 (1989-04-01), Morisawa
patent: 4867014 (1989-09-01), Sugano
Service Manual for Toyota Supra (A3408) Feb. 1986.

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