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Method for controlling a hydrodynamic retarder that can be mechanically disengaged by a disconnect clutch

A separation clutch and hydraulic reducer technology, applied in the field of hydraulic reducer, can solve the problems of shortened service life and high separation clutch

Active Publication Date: 2016-01-20
VOITH PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the wear of the separating clutch has been significantly reduced by the aforementioned measures, there have always been cases where the separating clutch has been subjected to particularly high wear and thus shortened its service life

Method used

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  • Method for controlling a hydrodynamic retarder that can be mechanically disengaged by a disconnect clutch
  • Method for controlling a hydrodynamic retarder that can be mechanically disengaged by a disconnect clutch

Examples

Experimental program
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Embodiment Construction

[0032] exist figure 1 A hydrodynamic retarder 1 with a rotor 2 and a stator 3 is shown in . Working medium is fed from the external working medium circuit 4 via the working medium supply 5 to the working chamber 7 and is discharged from the gear unit 1 via the working medium discharge 6 for cooling the working medium heated in the working chamber 7 . An inlet valve 8 is arranged in the working medium supply 5 , and a retarder outlet valve 9 is arranged in the working medium outlet 6 . The retarder control device 10 acts at least indirectly both on the retarder inlet valve 8 and also on the retarder outlet valve 9 . For the transition from non-braking operation to braking operation, the retarder inlet valve 8 is opened. The retarder outlet valve 9 is actuated with the set pressure such that it leads to the desired retention of the working medium and thus to the desired filling degree of the working chamber 7 . Alternatively, it is also conceivable to control the degree of fi...

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Abstract

The invention relates to a method for controlling a hydrodynamic retarder in a motor vehicle. Said hydrodynamic retarder, which can be mechanically disengaged by a disconnect clutch, comprises a revolving bladed rotor and a bladed stator or a revolving bladed rotor and a bladed counter-rotating rotor that revolves in the opposite direction thereto which jointly form a working chamber that is filled with a working medium in a braking mode and is purged of the working medium in a non-braking mode. The rotor is driven via a drive train including an engaged disconnect clutch in the braking mode, and the working chamber is purged and the disconnect clutch is disengaged during the transition from the braking mode to the non-braking mode, the transition from the braking mode to the non-braking mode being initiated by a request that the retarder be switched off made by a driver assistance system or by a driver of the vehicle actuating an input device, and the transition from the non-braking mode to the braking mode being initiated by a request that the retarder be switched on made by a driver assistance system or by a driver of the vehicle actuating an input device. The method according to the invention is characterized in that a rotational speed of the rotor and / or a speed of the motor vehicle is monitored and, independently of the request that the retarder be switched on made by a driver assistance system or by a driver of the vehicle actuating an input device, the disconnect clutch is engaged below a predefined rotational speed of the rotor and / or speed of the motor vehicle.

Description

technical field [0001] The invention relates to a method for controlling a hydrodynamic retarder in a motor vehicle which can be mechanically disengaged via a separating clutch, in particular according to the preambles of the independent claims. Background technique [0002] In order to reduce the no-load running losses of the hydrodynamic retarder to zero, it has been proposed to decouple the hydrodynamic retarder from the drive train by means of a separating clutch in non-braking operation. In braking operation, the hydrodynamic retarder should Brake the drive train. At the same time, during the transition from braking operation to non-braking operation, the working chamber is emptied of the working medium, and the working medium transmits a hydraulic circulation flow in the working chamber during braking operation to transfer the torque from the rotor to the stator , or in the case of a counter gear, from the rotor to a counter rotor which revolves in the opposite direct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T10/02F16D57/04F16D67/02
CPCB60T10/02F16D57/04F16D67/02F16D57/005F16D57/02
Inventor 维尔纳·亚当斯迪特尔·劳克曼阿希姆·门内拉维·沙德
Owner VOITH PATENT GMBH
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