Patent ID: 6962547
Filing Date: 2005-11-08
Classification: F16H

Abstract:
1. An oil pressure control device for use with a vehicle transmission, which transmission has a shift lever that is configured to select a range from among a drive range that advances the vehicle, a reverse range that reverses the vehicle, and a stop range that stops the vehicle, wherein the vehicle has forward and reverse frictional-engagement devices that convert a drive force generated by an engine to a drive force that advances the vehicle or a drive force that reverses the vehicle, wherein the forward frictional-engagement device is engaged by oil pressure in the drive range, wherein the reverse frictional-engagement device is engaged by oil pressure in the reverse range, and wherein both the forward frictional-engagement device and the reverse frictional-engagement device are released in the stop range, the oil pressure control device comprising: a pressure adjusting device that engages or releases the forward frictional-engagement device or the reverse frictional-engagement device by supplying the oil pressure to one of the forward frictional-engagement device and the reverse frictional-engagement device; a sensor that detects a range selected by the shift lever; and a controller that controls the pressure adjusting device based on a signal from the sensor, wherein the controller is configured to measure a stop-range selected time period during which the stop range is selected after the reverse range, and wherein the controller functions to control the pressure adjusting device to: wherein, during the predetermined time period, the supplied oil pressure is set depending on the stop-range selected time period.