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Direct sampling of engine emissions for instantaneous analysis

  • US 5,138,163 A
  • Filed: 09/09/1991
  • Issued: 08/11/1992
  • Est. Priority Date: 09/09/1991
  • Status: Expired due to Term
First Claim
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1. A method of on-line gas analysis of a multicomponent gas emission flow comprising gas species, comprising:

  • (a) continuously withdrawing a first sample flow from said gas emission flow and regulating the first sample flow pressure;

    (b) continuously withdrawing a second sample flow from said first sample flow, said second sample flow being diluted with mass controlled amounts of diluent to lower the dew point of the second sample flow to below room temperature;

    (c) controlling the absolute pressure of said diluted second sample to the range of 920-950 mbar;

    (d) frequently periodically analyzing the diluted second sample flow, controlled as to pressure, by fourier-transform infrared spectrometric techniques to render a concentration measure for one or more of said gas species and carbon in such species; and

    (e) correcting said one or more concentration measures for dilution to derive an undiluted concentration measure, said correction being accomplished by measuring the actual air/fuel ratio used to provide the gas emission flow, such actual A/F measurement being used to provide a theoretical carbon concentration for each said undiluted concentration measure and thereafter ratioing said theoretical carbon concentration to said carbon concentration measure for said ne or more gas species to provide a correction factor.

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