Oil pressure control of transmission for vehicles

Details Oil pressure control of transmission for vehicles Oil pressure control of transmission for vehicles

2005-11-08

2005-11-08

Wright, Dirk (Department: 3681)

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

Reexamination Certificate

active

06962547

ABSTRACT:
An oil pressure control device, which changes a range of a vehicle transmission includes: a pressure adjusting device that engages or releases forward and reverse frictional-engagement devices by adjusting an oil pressure supply, a sensor that detects a range selected by a vehicle driver, and a controller that controls the clutch pressure adjusting device based on a signal from the sensor. When the stop range is selected after selecting the reverse (forward) range, a forward (reverse) range is selected. After supplying an initial oil pressure to the forward (reverse) frictional-engagement device, the pressure adjusting device is controlled so that the pressure decreases from the initial oil pressure to a predetermined oil pressure. Subsequently, the oil pressure is initially increased at a small increase rate from the predetermined oil pressure. After a predetermined time period has elapsed, the pressure adjusting device increases the oil pressure at a large increase rate.

REFERENCES:
patent: 5046175 (1991-09-01), Lentz et al.
patent: 5046178 (1991-09-01), Hibner et al.
patent: 5733220 (1998-03-01), Iizuka
patent: 9-68266 (1997-03-01), None

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