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Analytical tachometers

  • US 5,646,340 A
  • Filed: 01/23/1996
  • Issued: 07/08/1997
  • Est. Priority Date: 01/24/1995
  • Status: Expired due to Term
First Claim
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1. A method of tachometric engine analysis adapted to measure and indicate engine rotation rate over a tachometric engine speed range, said method comprising the steps of:

  • (a) providing vibration-responsive sensor means adapted to generate a signal related to sensed vibrations;

    (b) installing the vibration-responsive sensor means in relation to an engine to be analyzed so as to sense and respond to vibrations caused by engine operation to produce a signal including a plurality of waveforms constituting a recognizable pattern or signature having a harmonic content characteristic of the configuration of the engine being analyzed;

    (c) tracking the signal over the tachometric engine speed range;

    (d) analyzing the signal to recognize the vibration pattern or signature and accordingly identify the corresponding engine type; and

    (e) analyzing the harmonic content of the pattern or signature by an algorithm adapted to identify the particular peak corresponding to engine speed, or a related peak, by reference to the relevant harmonics thereof in the signature to provide a substantially real-time indication of engine speed over the tachometric engine speed range.

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