Process for checking the operability of an exhaust gas purification catalyst
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United States of America Patent
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May 25, 2004
Grant Date -
Oct 25, 2001
app pub date -
Mar 16, 2001
filing date -
Mar 21, 2000
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Abstract
A process for checking the operability of an exhaust gas purification catalyst for diesel engines, which has a light-off temperature and a degree of conversion r.sub.CO for carbon monoxide (CO), by direct measurement of the carbon monoxide concentration in combination with a temperature measurement. To evaluate the remaining catalytic activity of the catalyst the difference .DELTA.T between the current catalyst exit temperature T.sub.E of the exhaust gas and the light-off temperature T.sub.CO,50%,fresh of the fresh catalyst for carbon monoxide stored as a function of the speed and load .DELTA.T=T.sub.E -T.sub.CO,50%,fresh is determined and the degree of conversion r.sub.CO for carbon monoxide is ascertained.
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