Patent ID: 9016450
Filing Date: 2015-04-28
Classification: B60T,F16D,F16H

Abstract:
1. A method for controlling a hydrodynamic retarder which can be disengaged mechanically via a separating clutch in a motor vehicle, the hydrodynamic retarder including a rotating bladed rotor and a bladed stator or a rotating bladed rotor and a bladed counter-rotor rotating in an opposite direction thereto, which together form a working chamber filled with a working medium in a braking operation and emptied of the working medium in a non-braking operation, wherein the rotating bladed rotor is driven in the braking operation via a drive train with a closed separating clutch and the working chamber is emptied when passing from the braking operation to the non-braking operation and the separating clutch opens, wherein a transition from the braking operation to the non-braking operation is initiated via a retarder switch-off request of a driver assistance system or via an actuation of an input device by a vehicle driver, the method comprising: determining a presence of the retarder switch-off request; keeping the separating clutch closed, after the determining, for a preset time span and emptying the working chamber of the hydrodynamic retarder of the working medium by continuous actuation of the rotating bladed rotor and interruption of infeed of the working medium into the working chamber; 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: