EXHAUST EMISSION CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust emission control device of an internal combustion engine capable of efficiently and securely controlling HC when the internal combustion engine is started in cold state.

SOLUTION: A three-way conversion catalyst 22 formed of a transition metal included in a catalyst layer is installed in an exhaust emission passage 14. An HC trap 20 adsorbing HC and discharging the adsorbed HC at a specified temperature or higher is installed on the upstream side of the three-way conversion catalyst. In addition, an oxygen supply means 34 supplying oxygen to the three-way conversion catalyst is installed.

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