Voith Patent Gmbh

Tilman Huth

Dieter Laukemann

Achim Menne

Werner Klement

Martin Becke

Werner Koch

Roland Scherer

Jürgen Betz

Martin Jaeger

Friedrich Fetzer

The invention concerns a hydrodynamic retarder The invention is characterised in that the control device when closing the separating clutch detects the run-up behaviour of the secondary side of the separating clutch and/or of the rotor via at least one associated sensor or defines the run-up behaviour from at least one input value supplied thereto and according to the run-up behaviour initiates either the continuous closing of the separating clutch for slip bridging between the primary side and the secondary side for accelerating the rotor or the interruption of the closing process of the separating clutch.

Disconnectable hydrodynamic retarder and method for controlling same

A motor vehicle drive train including a hydrodynamic retarder () that comprises a revolving bladed impeller () and a stationary or counter-rotating bladed turbine () which jointly form a working chamber () that can be filled with a working medium to switch on the retarder () is disclosed. The hydrodynamic retarder () can be mechanically disengaged from the drive train by a disconnect clutch (). A fill level monitoring device () can detect the current fill level of the working medium in the working chamber (), while a disconnect clutch-blocking device () is effectively connected in a communicating or mechanical manner to the fill level monitoring device () and prevents the disconnect clutch () from engaging in accordance with the detected fill level.

Motor vehicle drive train comprising a hydrodynamic retarder that can be disengaged, and control method therefor

There is provided a method for controlling a hydrodynamic retarder. The method includes determining a presence of a retarder switch-off request, and keeping a separating clutch closed, after the determining, for a preset time span and emptying a working chamber of the hydrodynamic retarder of a working medium by continuous actuation of a rotating bladed rotor and interruption of infeed of the working medium into the working chamber. The method further included varying the preset time span according to at least one of the following parameters or at least one parameter correlated with one of the following parameters: a rotational speed of the rotating bladed rotor, an output pressure, against which the working medium is emptied from the working chamber, a filling level of the working chamber with the working medium, a temperature of the working medium, and a braking torque of the hydrodynamic retarder.

Method for controlling a hydrodynamic retarder which can be disengaged mechanically via a separating clutch

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Satteldorf, Germany

Tilman Huth