| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device of an engine, of efficiently purifying the exhaust gas by eliminating the individual difference of an injection valve and a variation in the injection amount of the injection valve. <P>SOLUTION: This exhaust emission control device of an engine has: a filter 20 which is installed in an exhaust passage 8 and purifies the exhaust gas, an oxidation catalyst 18 installed further on the upstream side of the exhaust passage than the filter; the exhaust fuel injection valve 32 installed in the exhaust passage on the upstream side of the oxidation catalyst; a detection means for detecting the deceleration fuel cut operation area of the engine; a parameter value detection means for detecting the parameter value (Tu) related to the temperature of the oxidation catalyst, a consumed oxide amount calculation means 39 for calculating the amount of the oxide consumed by the oxidation catalyst; and a learning means 40 which makes the exhaust fuel injection valve inject a fuel according to an injection command value when a parameter value is equal to or more than a predetermined threshold and the engine is in the deceleration fuel cut operation area, and learns the difference between the target injection amount corresponding to the injection command value and the actual injection amount estimated from the calculated consumed amount of oxygen. <P>COPYRIGHT: (C)2010,JPO&INPIT |
