Conversion efficiency measuring apparatus of catalyst used for exhaust gas purification of internal combustion engine and the method of the same
First Claim
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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Abstract
A conversion efficiency of a catalyst is estimated by a correlation function concerning output signals of upper and down stream side air fuel ratio sensors. The conversion efficiency is measured by comparing the correlation function and a complement value of the correlation function with a comparing standard value.
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Citations
33 Claims
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1. A conversion efficiency measuring apparatus of a catalyst used for an exhaust gas purification of an internal combustion engine comprising
a 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, and means 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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30. A conversion efficiency measuring method of a catalyst used for an exhaust gas purification of an internal combustion engine, comprising;
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a step for measuring an output signal form an exhaust gas component sensing means provided at upstream and downstream sides of said catalyst used for an exhaust gas purification of an internal combustion engine, a step of calculating a correlation function based on said output signal of said exhaust gas component sensing means, a step of retrieving a comparison level which is used for estimating said conversion efficiency of said catalyst of said exhaust gas purification, and a step of measuring said conversion efficiency of said catalyst used for said exhaust gas purification by comparing an output signal of said correlation function with an output signal of said comparison level. - View Dependent Claims (31, 32, 33)
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Specification