An emission control apparatus for an engine

摘要

An emission control apparatus is disclosed in which a three way catalyst 14 and a lean NOx trap 15 are mounted in a single housing 22. An exhaust gas cooler 13 may be positioned upstream from the lean NOx trap 15 to reduce the temperature of the exhaust gases passing through the lean NOx trap 15 and allow it to be positioned close to an outlet 11 from an engine 10.