Exhaust gas purifying apparatus and control method therefor
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United States of America Patent
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-
Apr 17, 2001
Grant Date -
N/A
app pub date -
Apr 26, 1999
filing date -
Apr 27, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An exhaust gas purifying apparatus provides a reflux pipe for connecting an intake pipe to an exhaust pipe and an EGR valve disposed in the reflux pipe for adjusting a flow rate of the exhaust gas flowing through the reflux pipe. A nitrogen oxide purifying catalyst section is formed by a brown miralite type composite oxide. A pair of electrodes are provided on the vicinity of the opposite ends of the purifying catalyst section. A conductivity measuring section measures conductivity of a nitrogen oxide catalyst of the nitrogen oxide purifying catalyst section through the electrodes. A control section controls an opening degree of the EGR valve on the basis of engine rpm, engine load and the conductivity measured in the conductivity measuring section.
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