Starting device for motor vehicles
AssigneeNissan Motor Co., Ltd.
InventorTomohiko Tanaka
Life of this patent
Estimating the term…
Abstract
A starting device has a first friction element, a second friction element, and a control unit controlling them to change their power transmission states. The friction elements are arranged between an engine and wheels. The control unit controls the first element to produce creep torque by its slippage for creep of a motor vehicle. It includes a slip state judging means judging an excessive slip state of the first element in which it deviates from a permissible slip state, and a slip state shifting means shifting the slip state of the first element and a power transmission state of the second element so as to perform a protect control in which a slip amount of the first element decreases and the second element slips, in a case where the slip state judging means judges the excessive slip state.
Claims20
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.
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 and the second friction element slips, in a case where the slip state judging device judges the excessive slip state of the first friction element, wherein
- the slip state shifting device ceases the protect control in a case where the slip state judging device judges that a time after the protect control starts is longer than a set time and a caloric value of the second friction element is less than a first threshold value.
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 and the second friction element slips, in a case where the slip state judging device judges the excessive slip state of the first friction element, wherein
- the slip state shifting device decreases a slip amount of the second friction element and inches the first friction element in a case where the slip state judging device judges that a time after the protect control starts is within a set time and a caloric value of the second friction element is not less than a first threshold value.
Dependencies are inferred from the claim text.