Patent ID: 9581611
Date: 2017-02-28
CPC Classifications: G01P,G01S

Claim:
1. A system for detecting a rotational speed of a turbocharger, comprising: a rotational speed sensor unit which includes (i) a radar transmitter emitting radar waves, and (ii) a radar receiver receiving the radar waves, wherein the rotational speed sensor unit is configured to detect radar waves reflected by at least one machine element of the turbocharger and provide the detected radar waves as a measuring signal; and an evaluation unit coupled to the rotational speed sensor unit and configured to: check, based on a predetermined criterion, whether the reflected radar waves are detectable by the radar receiver; and ascertain the rotational speed of the turbocharger based on an evaluation of the measuring signal; wherein the predetermined criterion includes a degree of a formation of a periodicity of the measuring signal.