| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technology capable of starting supply of a reducing agent in an early stage, when starting supply of secondary air, in an exhaust emission control device of an internal combustion engine. <P>SOLUTION: An exhaust passage of the internal combustion engine is provided with a reducing agent supply means, an exhaust emission control catalyst, a secondary air supply means and a catalyst having oxidation capacity in order. When a supply quantity of the secondary air gradually increases by starting the supply of the secondary air from the secondary air supply means, a supply quantity of the reducing agent from the reducing agent supply means, is adjusted in response to the supply quantity of secondary air so that the air-fuel ratio of exhaust gas flowing in the catalyst having the oxidation capacity becomes the target air-fuel ratio. <P>COPYRIGHT: (C)2008,JPO&INPIT |
