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Conversion efficiency measuring apparatus of catalyst used for exhaust gas purification of internal combustion engine and the method of the same

  • US 5,237,818 A
  • Filed: 03/19/1992
  • Issued: 08/24/1993
  • Est. Priority Date: 03/20/1991
  • Status: Expired
First Claim
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1. A conversion efficiency measuring apparatus of a catalyst used for an exhaust gas purification of an internal combustion engine comprisinga catalyst used for an exhaust gas purification provided at an exhaust gas passage of an internal combustion engine,gas component sensing means provided at an upstream side and a downstream side of said catalyst used for said exhaust gas purification, andmeans for calculating a correlation function based on an output signal from said exhaust gas component sensing means and estimating the conversion efficiency of said catalyst for said exhaust gas purification based on a signal generated by comparing a calculated value of the correlation function with a comparison level used for estimating the conversion efficiency of said catalyst used for said exhaust gas purification.

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