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Method for determining state of torsional vibration damper of vehicle

A torsional vibration damper and state technology, applied in the design characteristics of spring/shock absorber, vehicle suspension/shock absorber mechanism test, spring/shock absorber, etc., can solve the problems of engine damage and high cost

Inactive Publication Date: 2019-07-16
SCHAEFFLER TECH AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Failure of this torsional vibration damper could lead to severe engine damage in an emergency
These torsional vibration dampers, especially with elastomers, are subject to slowly increasing wear, which however can only be inspected in the dismantled state at a correspondingly costly level in the workshop

Method used

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  • Method for determining state of torsional vibration damper of vehicle
  • Method for determining state of torsional vibration damper of vehicle
  • Method for determining state of torsional vibration damper of vehicle

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Embodiment Construction

[0021] figure 1 This is a first embodiment of the method according to the invention, in which an insufficient functionality of the torsional vibration damper is detected in conjunction with the acoustic structure-borne sound detection. In this case, an acoustic structure-borne noise image emitted by an engine-mounted structure-borne noise sensor is evaluated, wherein the acoustic amplitude is displayed via a number of different measurements. The standard deviation of the acoustic amplitude is plotted as threshold S with an amplitude of 0.2. Measurement results below this standard deviation mean that the tested component is normal. Components whose acoustic amplitudes exceed threshold value S as standard deviation are highlighted from the sharpness caused by the tolerance. Thus, measuring point A is detected at an acoustic amplitude of approximately 0.46, while at the same time a second measuring point B is detected at an acoustic amplitude of 0.82. Measurement A concerns to...

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Abstract

The invention relates to a method for the state monitoring of a torsional vibration damper of a vehicle, wherein a state is detected by sensing structure-borne sound waves. In a method for state monitoring that simply and economically leads to a fast result, the structure-borne sound waves are evaluated in accordance with operating point on the basis of a structure-born-sound noise image recordedduring the driving operation of the vehicle.

Description

technical field [0001] The invention relates to a method for state determination of a vehicle torsional vibration damper, in which wear is detected by detecting structure-borne sound waves. Background technique [0002] In order to achieve targets in terms of fuel consumption and CO2 emissions in vehicles, car manufacturers intend to reduce size and speed. In this case, smaller engines with fewer cylinders are used, which compensate for the missing displacement volume by increasing the average pressure and which generally also operate at lower engine speeds. However, this increased combustion chamber pressure of these smaller engines and the lower firing frequency due to the reduced engine speed lead to more intense vibrations in the crank drive. A torsional vibration damper is therefore used which compensates for this rotational inhomogeneity and isolates the vibrations of the crankshaft from the belt drive and the auxiliary unit. On the driven side, this torsional vibrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16F15/123G01M13/02G01M15/12
CPCF16F15/123F16F2230/0047F16F2230/24F16F2230/46G01M13/028G01M17/04F02D2200/025F16F15/002
Inventor 卡斯滕·莫尔
Owner SCHAEFFLER TECH AG & CO KG
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