| 摘要 |
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 (S<SUB>E</SUB>) of the turbocharger and analyzing the frequency spectrum ( 30, 31, 32, 33 ) of the recorded body sound (S<SUB>E</SUB>). According to the invention, in the analysis of the frequency spectrum several frequency signals (S<SUB>D1</SUB>, S<SUB>D2</SUB>, S<SUB>D3</SUB>) are determined, which represent possible rotational speeds of the turbocharger, an amplitude analysis of the recorded body sound (S<SUB>E</SUB>) is performed in order to determine an estimated value (S<SUB>D-estimate</SUB>) for the turbocharger speed, and the estimated value (S<SUB>D-estimate</SUB>) is correlated with the several frequency signals (S<SUB>D1</SUB>, S<SUB>D2</SUB>, S<SUB>D3</SUB>) in order to determine the frequency signal (S<SUB>D2</SUB>) as the actual turbocharger rotational speed (D<SUB>actual</SUB>) which correlates with the greatest probability with the obtained estimate (S<SUB>D-estimate</SUB>).
|
