Apparatus for diminishing nitrogen oxides
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United States of America Patent
Stats
-
May 2, 1995
Grant Date -
N/A
app pub date -
Nov 9, 1993
filing date -
Jun 3, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for diminishing the amount of NO.sub.x in the exhaust gases of an engine by a catalytic converter installed in its exhaust system. The apparatus includes an injector associated with the intake system of the engine, or the exhaust system upstream of the catalytic converter for injecting fuel into the intake, or exhaust system to ensure that the catalytic converter receives a sufficient supply of hydrocarbon. The amount of NO.sub.x in the exhaust gases leaving the engine is estimated from the number of revolutions thereof and the angle of a control lever, or the concentration of NO.sub.x in the exhaust gases leaving the catalytic converter is detected by a sensor. The amount of fuel injection into the intake, or exhaust system is controlled in accordance with the estimated amount of NO.sub.x, or the output of the sensor.
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