Active oscillation damping for a truck drive train

This paper presents a comparison of two alternative control structures for an active oscillation damping of truck drive trains. Uncomfortable oscillations in the drive train may occur in phases when the dry clutch is slipping. The negative friction coefficient of the clutch lining could cause an undesired judder, which leads to a severe driver discomfort. In the first approach, a model-based control design is applied to calculate an adaptive clutch torque for an active oscillation damping. This torque is calculated in such a way that the relative angular velocity between the clutch and the drive side is actively dampened. Despite a measurement of the angular velocity at the drive side, this value is usually not available for the transmission control unit. Therefore, a Luenberger observer is employed that estimates the state vector as well as a disturbance torque. In the second approach, a simple feedback of the filtered angular velocity signal at the clutch side is used for an active damping of torsional oscillations in the truck drive train. Both control approaches are validated on a dedicated test rig at the Chair of Mechatronics, University of Rostock.