Drive train having clutch activation for overcoming the backlash of the drive train before start-up
AssigneeSchaeffler Technologies AG & Co. KG
InventorMichael Reuschel
Life of this patent
Estimating the term…
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.
Claims9
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.
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:
- 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.
A drive train for a motor vehicle, comprising a drive unit having:
- 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.
Dependencies are inferred from the claim text.