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Rotational turbocharger speed detector

  • US 6,298,728 B1
  • Filed: 04/22/1999
  • Issued: 10/09/2001
  • Est. Priority Date: 04/23/1998
  • Status: Expired due to Fees
First Claim
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1. A rotational speed detector for a turbocharger arranged of two turbochargers on an internal-combustion engine, comprising:

  • at least one piezoelectric acceleration sensor fixed on each of the turbochargers and constructed as a knock sensor, the sensor providing output signals;

    an analyzing unit receiving the output signals and including an analog filter arrangement which filters the output signals from the acceleration sensor to provide filtered output signals; and

    wherein the filtered output signals are provided as input signals to an electronic control unit of the internal-combustion engine or a measuring unit either by way of a frequency-to-voltage converter in the form of an analog voltage or directly in the form of frequency signals wherein said analyzing unit or said control unit comprises means for forming a differential rotational signal.

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