METHOD AND DEVICE FOR MEASURING THE ROTATIONAL SPEED OF A TURBOCOMPRESSOR, AND MOTOR VEHICLE

摘要

The invention relates to a method and a device for measuring the rotational speed of a turbocompressor, in particular a turbocharger of a motor vehicle. The frequency of the pressure pulses that are generated in the medium by the blades or by the shaft of the turbocompressor is measured using the high-frequency signal portion of a pressure sensor, and the turbocompressor rotational speed is ascertained from the measured pressure pulse frequency. Furthermore, the charge pressure of the turbocompressor can be ascertained from the low-frequency signal of the pressure sensor so that a single sensor is sufficient for both measurements. The pressure sensor can be arranged in the intake system downstream of the compressor, upstream or downstream of an intercooler.