Schaeffler Technologies Ag & Co .kg

Oliver Rink

Markus Dietrich

Carsten Mayer

Yunfan Wei

Actuation of a hydraulic device that provides a hydraulic supply to a torque-transmitting device is provided. An electrically operated pump is operated in a first operating state. The first operating state has a primary pump rotational speed that provides a first fluid pressure to the torque-transmitting device via a fluid tract. A switchover process is initiated to operate the electrically operated pump device in a second operating state based on a second fluid pressure and a second fluid target pressure. The second operating state has a secondary pump rotational speed that provides the second fluid pressure to the torque-transmitting device via the fluid tract. During operation of the hydraulic device, the secondary pump rotational speed for the switchover process is determined based on a first power value. The first power value includes electrical pump power of the pump device in a preceding switchover process.

Method for actuating a hydraulic device

A method for operating a rotation sensor comprising at least four magnetoresistive sensor elements is described. Each sensor element comprises a packet of a ferromagnetic reference layer and a sensitive ferromagnetic layer and a non-magnetic layer separating the reference layer from the sensitive layer. The layers are designed such that the orientation of the magnetization in the respective layer is possible in the longitudinal direction of the layer. The at least one sensor element is formed in a plane in a spiral form with at least one complete winding and the windings are implemented concentrically. The sensor element is bent into a winding in different segments. Adjacent segments enclose an angle between them and each complete winding comprises a predetermined number of segments.

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Karlsruhe, Germany

Oliver Rink