Exhaust gas purifying method, exhaust gas purifying apparatus, and exhaust gas collecting apparatus of internal combustion engine

摘要

To restrict the discharging of harmful components immediately after the starting of an internal combustion engine, an exhaust gas collecting apparatus of an internal combustion engine comprises: a collection vessel that can hold exhaust gas; an exhaust gas taking-out passage through which exhaust gas is introduced from an exhaust passage to the collection vessel; an exhaust gas introduction passage through which the exhaust gas is introduced from the collection vessel to the exhaust passage at a position upstream from the catalytic converter; a switching valve that is switchable between a position where the introduction of the exhaust gas from the exhaust passage to the exhaust gas taking-out passage is permitted and a position where the introduction of the exhaust gas is prevented; and an open/close valve that is switchable between a position where the introduction of the exhaust gas through the exhaust gas introduction passage is permitted and a position where the introduction of the exhaust gas is prevented. The switching valve is controlled such that at least a part of the exhaust gas discharged from an internal combustion engine is collected into the collection vessel through the exhaust gas taking-out passage during a period from a starting time of the internal combustion engine to satisfaction of a predetermined collection terminating condition.