Patent ID: 7329206
Filing Date: 2008-02-12
Classification: B60W,F16D,F16H,Y10T

Abstract:
1. A starting device for a motor vehicle comprising: a first friction element arranged between an engine and wheels; a second friction element arranged between the engine and the wheels; and a control unit that controls the first friction element and the second friction element to change from a disengagement state to a complete engagement state, the control unit being capable of controlling the first friction element to produce creep torque by a slippage thereof so that the creep torque enables a motor vehicle to creep, wherein the control unit includes a slip state judging device that judges an excessive slip state of the first friction element in which the first friction element deviates from a permissible slip state, and a slip state shifting device that shifts a slip state of the first friction element and a power transmission state of the second friction element so as to perform a protect control in which a slip amount of the first friction element decreases to increase transmitting torque thereof and the second friction element slips to apply brake torque to the wheels so that the creep torque is produced by subtracting brake torque of the second friction element from the transmitting torque of the first friction element, in a case where the slip state judging device judges the excessive slip state of the first friction element.