Directing exhaust gas around a catalyst may pre-heat the catalyst and may thereby bring the catalyst quickly in its operating temperature range. An exhaust gas treatment system (2) for treating the exhaust gas may comprise a first flow path (38), a second ...

Provided is a control apparatus for an internal combustion engine that can adequately secure a required addition period of fuel that is added by a fuel addition valve, regardless of the operating state of the internal combustion engine. A fuel addition val...