Hydraulic control circuit for automatic transmission

Details Hydraulic control circuit for automatic transmission Hydraulic control circuit for automatic transmission

1987-09-29

1989-10-03

Diehl, Dwight G.

Machine element or mechanism

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

Preselected indexed position

B60K 4106

Patent

active

048708771

ABSTRACT:
A hydraulic control circuit for an automatic transmission is provided in which the automatic transmission has at least five forward gear shift stages. A plurality of solenoid valves are connected to hydraulic shift valves for controlling hydraulic line pressure utilized in the shifting between the various gear shift stages. Further, each of the gear shift stages is established dependent upon the operating condition of each of the solenoid valves. An inhibitor valve is provided which is operative by one of the solenoid valves and serves to provide an inhibiting function for solenoid valve disconnection and for manual downshift operation.

REFERENCES:
patent: 4468987 (1984-09-01), Miller
patent: 4567791 (1986-02-01), Sato
patent: 4727773 (1988-03-01), Sumiya et al.

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