Oil pressure control device for automatic transmission

Details Oil pressure control device for automatic transmission Oil pressure control device for automatic transmission

2007-08-21

2007-08-21

Rodriguez, Saul (Department: 3681)

192 clutches and power-stop control

Transmission control and clutch control

Common control

C192S083000

Reexamination Certificate

active

11174549

ABSTRACT:
In an automatic transmission having multiple oil pressure control valves for controlling friction engagement elements, a first and second pressure modulating valves are provided between an oil pressure generating means (pump) and the oil pressure control valves. A switching valve is further provided between the pressure modulating valves and the oil pressure control valves. In case that one of the pressure modulating valves becomes out of order, the oil pressure of a working oil is supplied to the oil pressure control valves from the other pressure modulating valve, so that the automatic transmission can be continuously operated even in the case that one of the pressure modulating valves becomes out of order.

REFERENCES:
patent: 4465167 (1984-08-01), Fujioka
patent: 2003/0042104 (2003-03-01), Matsufuji et al.
patent: 2002-267007 (2002-09-01), None

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