| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device capable of restraining the deterioration in emission, by properly maintaining the catalyst temperature, in a vehicle equipped with a plurality of internal combustion engines. <P>SOLUTION: This exhaust emission control device 1 is an exhaust emission control device of the internal combustion engine having a main engine 10, a sub-engine 20, an exhaust pipe 170 having a gathering part 180 for gathering exhaust gas of the main engine 10 and exhaust gas of the sub-engine 20, and an exhaust emission control catalyst 40 arranged downstream of the gathering part 180; and has a catalyst temperature sensor 41 for detecting the temperature of the exhaust emission control catalyst 40, an air-fuel ratio sensor 42 for detecting the air-fuel ratio of the main engine 10, and an engine ECU 50 for controlling the air-fuel ratio of the sub-engine 20 so as to oscilate between rich and lean when the air-fuel ratio of the main engine 10 is stoichiometric when the catalyst temperature Tc is the activation temperature Ta or more and the first predetermined temperature T1 or less. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
