Control apparatus for hydraulically operated vehicular transmiss

Details Control apparatus for hydraulically operated vehicular transmiss Control apparatus for hydraulically operated vehicular transmiss

1999-05-13

2000-04-04

Estremsky, Sherry L.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

475122, B60K 4106, F16H 6126

Patent

active

060454830

ABSTRACT:
There are respectively provided control valves 15, 16 in hydraulic oil paths L11, L12 for inputting governor pressure PV into shift valves 11.sub.1, 11.sub.2, 11.sub.3. In the control valves 15, 16, there are provided first pressure chambers 15g, 16g pushing the spools 15a, 16a of the control valves 15, 16 onto the closing position side. At position "D.sub.3 " or "2", hydraulic pressure is inputted into the first pressure chambers 15g, 16g, so that the spools 15a, 16a can be changed over to the closing position, and the input of governor pressure PV into the shift valves 11.sub.1, 11.sub.2, 11.sub.3 is stopped so that the shift valves can be changed over to the low speed position. In the control valves 15, 16, there are provided second pressure chambers 15h, 16h pushing the spools 15a, 16a onto the opening position side, and governor pressure PV is inputted into the second pressure chambers 15h, 16h. In this way, the spools 15a, 16a are not changed over to the closing position while the vehicle is running at high speed.

REFERENCES:
patent: 3738198 (1973-06-01), Kell
patent: 4680989 (1987-07-01), Sykora et al.

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