Patent ID: 8219295

Claim:
An engaging-force control apparatus for a friction-engagement element, adapted to control a slip rotational speed between an input-side rotational speed and an output-side rotational speed of the friction-engagement element by increasing or decreasing an engaging force of the friction-engagement element which is determined by a target engaging pressure for the friction-engaging element, the engaging-force control apparatus comprising: an engaging-force feedback control section configured to control the engaging force of the friction-engagement element to bring the slip rotational speed of the friction-engagement element to 0 by way of feedback control; and an engaging-force restricting section configured to restrict the engaging force of the feedback control of the engaging-force feedback control section to prevent the engaging force of the feedback control from exceeding a minimum engaging-force value necessary to maintain the slip rotational speed at 0, by calculating the target engaging pressure so as to bring the detected slip rotational speed to 0 during the feedback control of the engaging-force feedback control section, if the target engaging pressure is lower than or equal to a minimum engaging-pressure value necessary to maintain the slip rotational speed at 0, and by setting the target engaging pressure at a value equal to the necessary minimum necessary engaging-pressure value, if the target engaging pressure becomes higher than the necessary minimum engaging-pressure valve during the feedback control.