Drive train having clutch activation for overcoming the backlash of the drive train before start-up
First Claim
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1. A drive train for a motor vehicle, comprising a drive unit having:
- a drive shaft; and
,a transmission having a transmission input shaft and a plurality of gears, of which at least one is used as a starting gear for the motor vehicle, and having a friction clutch, which is arranged between the crankshaft and the transmission input shaft and is actuated in an automated manner, wherein a rotation clearance present in the transmission is compensated by applying a small compensating torque set at the friction clutch to the transmission input shaft while the starting gear is engaged before start up.
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Abstract
A drive train for a motor vehicle, including a drive unit having a drive shaft and a transmission having a transmission input shaft and a plurality of gears, of which at least one is used as a starting gear for the motor vehicle, and having a friction clutch, which is arranged between the crankshaft and the transmission input shaft and is actuated in an automated manner. In order to prevent start-up noise caused by backlashes in the motor vehicle, a backlash present in the transmission is compensated by applying a small compensating torque set at the friction clutch to the transmission input shaft while the starting gear is engaged before start up.
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Citations
9 Claims
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1. A drive train for a motor vehicle, comprising a drive unit having:
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a drive shaft; and
,a transmission having a transmission input shaft and a plurality of gears, of which at least one is used as a starting gear for the motor vehicle, and having a friction clutch, which is arranged between the crankshaft and the transmission input shaft and is actuated in an automated manner, wherein a rotation clearance present in the transmission is compensated by applying a small compensating torque set at the friction clutch to the transmission input shaft while the starting gear is engaged before start up. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for actuating a drive train for a motor vehicle including a drive unit having a drive shaft and a transmission having a transmission input shaft and a plurality of gears, of which at least one is used as a starting gear for the motor vehicle, and having a friction clutch, which is arranged between the crankshaft and the transmission input shaft and is actuated in an automated manner, the method comprising:
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compensating a rotation clearance present in the transmission by applying a small compensating torque set at the friction clutch to the transmission input shaft while the starting gear is engaged before start up, wherein; compensating the rotation clearance includes compensating the rotation clearance when the motor vehicle is standing still and a brake of the motor vehicle is actuated.
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9. A drive train for a motor vehicle, comprising a drive unit having:
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a drive shaft; and
,a transmission including an input shaft, an output shaft, a plurality of gears, and a friction clutch, wherein; a gear from the plurality of gears is used as a starting gear for the motor vehicle; the friction clutch is arranged between the crankshaft and the transmission input shaft and is actuated in an automated manner; a rotation clearance is present in the transmission; the rotation clearance is determined by comparing a speed of the transmission input shaft with a speed of the transmission output shaft; and the rotation clearance is compensated by applying a small compensating torque set at the friction clutch to the transmission input shaft while the starting gear is engaged before start up.
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Specification