Patent ID: 9073550
Filing Date: 2015-07-07
Classification: B60W,F16D,Y02T

Abstract:
1. A method of operating a drive-train in which the drive-train comprises a drive aggregate, a transmission and a starting clutch connected between the drive aggregate and the transmission, the method comprising the steps of: operating the drive-train during rolling in a thrust operation and during coasting in a thrust operation at a speed in which the drive-train is prone to oscillation which leads to a resonance effect of the drive-train, and determining a utilized target value for a position of the starting clutch as a function of a transmission input speed; comparing the utilized target value for the position of the starting clutch with a corresponding actual value of the position of the starting clutch; generating, in a regulator, a control parameter, for adjusting a degree of engagement of the starting clutch, on a basis of a deviation between the utilized target value for the position of the starting clutch and the actual value of the position of the starting clutch; for a given value of the transmission input speed, determining a rolling target value for the position of the starting clutch during rolling in the thrust operation and also determining a coasting target value for the position of the starting clutch for coasting in the thrust operation in such manner that the rolling target value determined for the position of the starting clutch during rolling is different from the coasting target value determined for the position of the starting clutch during coasting; and selecting the rolling target value as the utilized target value for the position of the starting clutch during rolling, and selecting the coasting target value as the utilized target value for the position of the starting clutch during coasting.