Hydraulic pressure-control valve for automatic vehicle transmiss

Details Hydraulic pressure-control valve for automatic vehicle transmiss Hydraulic pressure-control valve for automatic vehicle transmiss

1999-06-28

2000-07-18

Marmor, Charles A

192 clutches and power-stop control

Clutches

Operators

192109F, 91459, 91461, F16D 1900, F16D 1100, F15B 13044, F15B 1108

Patent

active

060893648

ABSTRACT:
A hydraulic pressure-control valve for controlling a pressure to be supplied to a frictional engaging element such as a start clutch in an automatic vehicle transmission, including a first pressure-regulating valve connected to a hydraulic pressure source and connected to the frictional engaging element through a second passage, and a solenoid for displacing the first-pressure-regulating valve. A second pressure-regulating valve is provided and is connected to the first pressure-regulating valve to receive the output hydraulic pressure, the first pressure-regulating and the second pressure-regulating valve are connected such that the output hydraulic pressure varies in response to the command input according to a first characteristic, while the output hydraulic pressure varies in response to the command input according to a second characteristic when the command input exceeds a predetermined value, wherein the output hydraulic pressure according to the first characteristic per unit of command input is less than the output hydraulic pressure according the second characteristic, thereby reducing load hysteresis and improving control accuracy in a low pressure region, while enabling to secure high torque capacity in a high pressure region.

REFERENCES:
patent: 3621955 (1971-11-01), Black et al.
patent: 3625322 (1971-12-01), Nagamatsu et al.
patent: 3672243 (1972-06-01), Murakami et al.
patent: 4033201 (1977-07-01), Sakai
patent: 4523513 (1985-06-01), Gudat et al.
patent: 5839345 (1998-11-01), Sandau et al.

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