Electronically-controlled, adaptive automatic transmission syste

Details Electronically-controlled, adaptive automatic transmission syste Electronically-controlled, adaptive automatic transmission syste

1989-08-09

1992-05-26

Diehl, Dwight

Machine element or mechanism

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

Preselected indexed position

60K 4106, B60K 4106

Patent

active

051156989

ABSTRACT:
The present invention is a hydraulic system for an automatic transmission having a torque converter for receiving power from a prime mover, and an assembly of hydraulically operated friction elements which provide clutch and brake functions. The hydraulic system includes a pump, a regulator valve, and a torque converter control valve for regulating fluid pressure to the torque converter. The hydraulic system also includes a manual valve and a plurality of solenoid valves for controlling fluid flow received at least in part from the manual valve to each of the friction elements. The hydraulic system further includes a switch valve operatively associated with the solenoid valve for enabling two of the friction elements to be controlled from only one of the solenoid valves.

REFERENCES:
patent: 4345489 (1982-08-01), Muller et al.
patent: 4351206 (1982-09-01), Lemieux et al.
patent: 4776240 (1988-10-01), Miki
patent: 4785689 (1988-11-01), Iwatsaki
patent: 4846021 (1989-07-01), Hamano et al.
patent: 4854195 (1989-08-01), Moroto et al.
patent: 4887491 (1989-12-01), Holbrook et al.

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