Arrangement for an after treatment of exhaust gases from an internal combustion engine
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United States of America Patent
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-
Mar 4, 1997
Grant Date -
N/A
app pub date -
Nov 17, 1995
filing date -
Nov 19, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To reduce NO.sub.x components in the exhaust gas from a compression-ignition internal combustion engine with the aid of a reducing catalytic converter, a metering device for the supply of reducing agent to be additionally introduced into the exhaust gas, in the form of fuel, is provided to improve the performance of the catalytic converter. For this purpose, use is made of a positive displacement pump designed to meter very small quantities with a helix in the form of a helical groove arranged on a cylindrical body of revolution, the delivery rate being varied by driving the body of revolution at a variable rotational speed.
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