Patent ID: 8282530
Filing Date: 2012-10-09
Classification: B60T,B60W,F16H,Y10T

Abstract:
1. A shift control system that controls a power transfer state of a power transfer mechanism of a vehicle in accordance with a shift operation by a driver, comprising: a shift operation input portion to which a shift operation by the driver is input; a shift control portion that switches a shift range in accordance with the shift operation by the driver and electrically controls the power transfer state of the power transfer mechanism; a brake control portion that applies braking force to wheels of the vehicle by controlling a wheel cylinder pressure by controlling the opening and closing of an electromagnetic valve provided in a hydraulic circuit in response to a brake pedal being stepped down; and a vehicle speed detection portion that detects the speed of the vehicle, wherein when a shift operation requesting the shift range to be switched to a parking range is input while the vehicle is running, the shift control portion maintains the wheel cylinder pressure at a given hold pressure for at least a given hold duration which is a predetermined duration within which the vehicle is estimated to stop, and after the hold duration has passed, the shift control portion switches the shift range to the parking range by actuating a lock mechanism that locks the output shaft of the power transfer mechanism, and the shift control system further comprising a brake operation detection portion that detects the operation state of the brake pedal, wherein when the vehicle speed detected by the vehicle speed detection portion has become substantially zero and the amount of depression of the brake pedal has become substantially zero, the shift control portion causes the brake control portion to start maintaining the wheel cylinder pressure at the hold pressure which is lower than a wheel cylinder pressure obtained when the brake pedal is being stepped down.