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

An exhaust gas purifying apparatus that purifies exhaust gas from an internal combustion engine by using a catalytic converter, the apparatus comprising:

• a collection vessel that can hold exhaust gas;
• an exhaust gas taking-out passage through which exhaust gas is introduced from an exhaust passage of the internal combustion engine to the collection vessel;
• an exhaust gas introduction passage through which the exhaust gas is introduced from the collection vessel to an upstream side from the catalytic converter;
• a first valve device 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;
• a second valve device that is switchable between a position where the introduction of the exhaust gas to the upstream side from the catalytic converter through the exhaust gas introduction passage is permitted and a position where the introduction of the exhaust gas is prevented;
• and
• a valve control device that controls the first valve device such that at least a part of the exhaust gas discharged from the 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.
• wherein the first valve device is switchable to a position where a part of the exhaust gas is introduced to the catalytic converter, and a remaining part of the exhaust gas is introduced to the exhaust gas taking-out passage, the part of the exhaust gas introduced to the catalytic converter flowing to the atmosphere without being collected into the collection vessel.

An exhaust gas collecting apparatus of an internal combustion engine, comprising:

• a collection vessel that can hold exhaust gas discharged from the internal combustion engine;
• an exhaust gas taking-out passage through which exhaust gas is introduced from an exhaust passage of the internal combustion engine 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 a catalytic converter;
• a first valve device 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
• a second valve device that is switchable between a position where the introduction of the exhaust gas from the exhaust gas introduction passage to the exhaust passage is permitted and a position where the introduction of the exhaust gas is prevented,
• wherein the first valve device is switchable to a position where a part of the exhaust gas is introduced to the catalytic converter, and a remaining part of the exhaust gas is introduced to the exhaust gas taking-out passage, the part of the exhaust gas introduced to the catalytic converter flowing to the atmosphere without being collected into the collection vessel.