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Misfire monitor for engine analysis having automatic rescaling

  • US 4,031,747 A
  • Filed: 08/16/1976
  • Issued: 06/28/1977
  • Est. Priority Date: 08/16/1976
  • Status: Expired due to Term
First Claim
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1. In engine exhaust gas analysis apparatus having:

  • means for sampling the exhaust gases including means for generating a first signal indicating the amount of a component present in the exhaust gases;

    differentiating means connected to said sampling means and including means responsive to said first signal for generating a second signal indicating the rate of change of said first signal with respect to time;

    means connected to said differentiating means for comparing said second signal to a limit; and

    ,means connected to said comparing means for indicating when said second signal exceeds said limit, the improvement comprising;

    means for causing the values of said second signal and said limit to be normalized to a standard range before said comparing is done whereby the exceeding of said limit by said second signal will have substantially the same meaning regardless of the engine being analyzed.

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