Method and apparatus for detemining the rotational speed of turbochargers
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Abstract
The invention relates to a method and a corresponding apparatus for detecting the rotational speed of turbochargers, especially on internal combustion engines in motor vehicles, with the steps: recording the body sound (SE) of the turbocharger and analyzing the frequency spectrum (30, 31, 32, 33) of the recorded body sound (SE). According to the invention, in the analysis of the frequency spectrum several frequency signals (SD1, SD2, SD3) are determined, which represent possible rotational speeds of the turbocharger, an amplitude analysis of the recorded body sound (SE) is performed in order to determine an estimated value (SD-estimate) for the turbocharger speed, and the estimated value (SD-estimate) is correlated with the several frequency signals (SD1, SD2, SD3) in order to determine the frequency signal (SD2) as the actual turbocharger rotational speed (Dactual) which correlates with the greatest probability with the obtained estimate (SD-estimate).
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Citations
25 Claims
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1-10. -10. (canceled)
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11. A method of detecting rotational speed of a turbocharger, comprising the steps:
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recording body sound of the turbocharger;
finding several frequency signals in the analysis of the frequency spectrum of the recorded body sound, which represent possible rotational speeds of the turbocharger;
analyzing amplitudes of the recorded body sound to determine an estimated value for the turbocharger speed;
correlating the estimate obtained with the several frequency signals; and
determining one of the several frequency signals as the actual turbocharger speed, which correlates with the determined estimate. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. Apparatus for detecting rotational speed of a turbochargers if an internal combustion engine, comprising:
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a sound pickup disposed on the turbocharger;
a device for recording and analyzing a frequency spectrum of output signals of the sound pickup; and
an evaluation circuit that is designed to conduct an frequency spectrum analysis to obtain a plurality of frequency signals which represent possible rotational speeds of the turbocharger, an amplitude analysis to obtain an estimate of the actual turbocharger speed, and a correlation of the obtained estimate with one of the several frequency signals in order to determine the actual turbocharger speed, wherein the frequency signal being determined from the determined frequency signals as the actual speed correlates with the greatest probability with the determined estimate. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification