Electronic and hydraulic system of five speed automatic transmis

Details Electronic and hydraulic system of five speed automatic transmis Electronic and hydraulic system of five speed automatic transmis

1994-12-30

1996-10-29

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477126, 477131, 475128, F16H 6126

Patent

active

055691161

ABSTRACT:
An electronic and hydraulic system of a five speed automatic transmission adapted to establish five forward and one reverse gear ratios by way of effecting selective engagement and disengagement of friction elements comprises an oil pump for producing a pressurized working fluid, a manual selector valve manually operated for distributing the working fluid to forward and reverse fluid lines, first to fourth shift valves for directing the working fluid to one of the friction elements, first to fourth solenoid valves associated with the first to fourth shift valves, respectively, for controlling positions of the shift valves in correspondence to a vehicle speed and a throttle opening degree, second to fourth speed valves each position-controlled by the first to third shift valves to change flow path of the working fluid and an overdrive unit valve position-controlled by the fourth shift valve.

REFERENCES:
patent: 4136584 (1979-01-01), Ishikawa
patent: 4776240 (1988-10-01), Miki
patent: 4831900 (1989-05-01), Yamamoto et al.
patent: 4838126 (1989-06-01), Wilfinger et al.
patent: 4840092 (1989-06-01), Sakaguchi et al.
patent: 5079973 (1992-01-01), Ookubo et al.
patent: 5150297 (1992-09-01), Daubenmier et al.
patent: 5157608 (1992-10-01), Sankpal et al.
patent: 5305663 (1994-04-01), Leonard et al.

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