Hydraulic control for shift elements of an automatic transmissio

Details Hydraulic control for shift elements of an automatic transmissio Hydraulic control for shift elements of an automatic transmissio

1991-08-20

1993-04-13

Lorence, Richard M.

Machine element or mechanism

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

Preselected indexed position

74866, B60K 4106

Patent

active

052012522

ABSTRACT:
The disclosed hydraulic control system for an automatic transmission has a main pressure valve to control main pressure produce by a pump, a manually operated slide valve to select a transmission condition, and electromagnetically operable valve arrangements receiving main pressure from the manual slide valve and by which the various main pressure levels are adjustable at corresponding transmission shift elements. At least one of the electromagnetic valve arrangements has a slide valve and an electromagnetic valve capable of being influenced by a control unit and at least one face of the slide valve is capable of being acted on by pressure.

REFERENCES:
patent: 3797330 (1974-03-01), Ushijima
patent: 3943799 (1976-03-01), Sakai et al.
patent: 4345489 (1982-08-01), Muller et al.
patent: 4395927 (1983-08-01), Muller et al.
patent: 4517859 (1985-05-01), Nagaoka et al.
patent: 4691597 (1987-09-01), Leorat et al.
patent: 4747807 (1988-05-01), Nakamura et al.

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