Exhaust gas purifier for internal combustion engines
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United States of America Patent
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Mar 30, 2004
Grant Date -
Jun 26, 2003
app pub date -
Nov 18, 2002
filing date -
Feb 26, 2001
priority date (Note) -
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Abstract
An exhaust passage (20) of an internal-combustion engine (1) is provided with an exhaust emission control unit (40) capable of reducing harmful substances in exhaust gas under a given exhaust pressure condition and an exhaust sensor (22) for detecting the concentration of a specific exhaust component (H.sub.2, O.sub.2) in the exhaust gas, and a performance lowering identifying unit identifies lowering of the performance of the exhaust emission control (40) by detecting a failure to fulfill the given exhaust pressure condition in accordance with the output of the exhaust sensor.
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