Engine brake control for automatic transmission

Details Engine brake control for automatic transmission Engine brake control for automatic transmission

1986-07-29

1988-08-23

Braun, Leslie A.

Machine element or mechanism

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

Preselected indexed position

74878, B60K 4104

Patent

active

047652039

ABSTRACT:
There is provided in an automatic transmission a shift valve which is provided with a plug movable responsive to an engine brake command to hold a valve spool of the shift valve to a downshift position thereof. The plug is designed to supply working hydraulic pressure to an engine brake friction element after it has moved responsive to the engine brake command to hold the valve spool of the shift valve to the downshift position thereof. When the engine brake command is not available, the plug allows the valve spool of the shift valve to move between the downshift position thereof and an upshift position thereof.

REFERENCES:
patent: 4148232 (1979-04-01), Moriya
patent: 4395926 (1983-08-01), Kubo et al.
patent: 4437358 (1984-03-01), Kubo et al.
patent: 4566355 (1986-01-01), Sugano
patent: 4574925 (1986-03-01), Nishimura et al.
patent: 4580466 (1986-04-01), Iwanaga
patent: 4637281 (1987-01-01), Vanselous
patent: 4665776 (1987-05-01), Sugano
patent: 4680992 (1987-07-01), Hayasaki et al.
General Motors Corporation, H 700-R4-195-7/83, p. 68; "Complete Hydraulic Oil Circuits".

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