Downshift timing and engine brake control for automatic transmis

Details Downshift timing and engine brake control for automatic transmis Downshift timing and engine brake control for automatic transmis

1986-08-05

1987-07-21

Herrmann, Allan D.

Machine element or mechanism

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

Preselected indexed position

74866, B60K 4118, B60K 4116

Patent

active

046809929

ABSTRACT:
An electro-hydraulic control for an automatic transmission for an automotive vehicle, comprises a 3-2 timing valve, an overrun clutch control valve, an electromagnetic valve under the control of a computer, and a shuttle valve. The shuttle valve has a spool movable responsive to a line pressure variable with the engine throttle opening degree. The spool is movable between a first position where the overrun clutch control valve is under the control of the electromagnetic valve and a second position where the 3-2 timing valve is under the control of the electromagnetic valve.

REFERENCES:
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patent: 4346627 (1982-08-01), Kawamoto et al.
patent: 4350234 (1982-09-01), Suga et al.
patent: 4476747 (1984-10-01), Kawamoto
patent: 4607542 (1986-08-01), Sugano
patent: 4616532 (1986-10-01), Sakai et al.
patent: 4617841 (1986-10-01), Sugano
General Motors Corporation, H 700-R4-195-7/83, p. 68 "Complete Hydraulic Oil Circuits".

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