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Methods and apparatus for engine analysis using internal electrical signals

  • US 9,200,981 B2
  • Filed: 03/15/2013
  • Issued: 12/01/2015
  • Est. Priority Date: 08/10/2011
  • Status: Active Grant
First Claim
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1. A method of analyzing an engine for misfire activity, comprising:

  • receiving an electrical signal corresponding to a plurality of cycles of the engine;

    identifying energy spikes in the electrical signal corresponding to cylinder firings in the engine;

    generating engine speed estimates based on spacing between the energy spikes; and

    analyzing anomalies in the engine speed estimates to identify misfire activity in the engine;

    wherein the energy spikes correspond to spark plug firings in the engine.

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