| 摘要 |
PROBLEM TO BE SOLVED: To suppress emission of HC and CO in an unburnt state in the atmosphere during ignition of EGC. SOLUTION: This exhaust gas emission control device comprises a catalyst 6 disposed in the exhaust pipe 2 of an engine 1; a combustion chamber 5 disposed in the exhaust pipe 2 situated upper stream from the catalyst 6; a secondary air pump 3 to supply secondary air to the exhaust pipe 2 situated upper stream from the combustion chamber 5; and a control unit 8 to control a fuel feed amount such that, when the temperature of the catalyst 6 is increased, an air-fuel ratio of air-fuel mixture fed to the engine 1 is brought into the further rich side than a theoretical air-fuel ratio, and control a secondary air amount such that an air-fuel ratio on the combustion chamber 5 is brought into an air-fuel ratio being a combustible lean limit.
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