Volkswagen Ag

Volker Pichmann

Georg Kruse

Gerhard Preine

Ulrich Remmlinger

A torque transfer device in a motor vehicle, used for variable transfer of torque from a first shaft associated with a first wheel pair to a second shaft associated with a second wheel pair. A coupling unit facilitates variable torque-transferring coupling of the first and second shaft. The coupling unit has a first coupling element rotationally connected to the first shaft and a second coupling element connected to the second shaft. The elements cooperate with each other or are capable of cooperating with each other in order to transfer torque. A controllable adjusting device adjusts a strength of the interaction between the coupling elements by adjusting a relative position and/or a mechanical contact pressure. A control device controls the adjustment. The control device includes a data processing unit for calculating a first control signal on the basis of a plurality of input signals according to predefined rules and for controlling the adjusting device. A second control signal is superimposed on the first control signal. The second control signal acts as an indication of the difference in rotational speeds of the first and second shafts. A change in the second control signal on the basis of a change of this difference caused by the driving situation is chronologically in advance of a change of the first control signal caused by the same driving situation.

Torque transmission device

A slide valve for controlling a torque converter bridging clutch for an automatic transmission of a motor vehicle includes a slide housing and a movable control slide by which hydraulic fluid connections and ports may be connected to each other in different ways. The slide includes a first control flange for alternatively or jointly controlling closing and opening lines leading to the converter bridging clutch. To ensure optimal regulation of the converter bridging clutch, the slide has a second control flange for selectively connecting the opening line to a drain port so that the hydraulic fluid can flow continually through the converter bridging clutch to remove heat.

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Braunschweig, Germany

Volker Pichmann