| 摘要 |
<P>PROBLEM TO BE SOLVED: To maintain a high NO<SB POS="POST">x</SB>reducing rate without degrading performance while improving fuel efficiency than before. <P>SOLUTION: In the method for controlling an exhaust cleaning apparatus, fuel 8 is added to an entry side of an NO<SB POS="POST">x</SB>occluding reducing catalyst 5, the added fuel 8 is decomposed to H<SB POS="POST">2</SB>and CO with a reforming catalyst 9 and is introduced to the NO<SB POS="POST">x</SB>occluding reducing catalyst 5. An exhaust temperature to gain a prescribed level NO<SB POS="POST">x</SB>reducing rate or more with a reducer HC in the NO<SB POS="POST">x</SB>occluding reducing catalyst 5 is made a reference temperature. When an exhaust temperature is lower than the reference temperature, a first fuel adding is executed in the range not reaching fuel rich atmosphere to heighten floor temperature of the reforming catalyst 9 to a fuel reforming temperature. Then, following the first fuel adding, a second fuel adding is executed to form fuel rich atmosphere. Further, when the exhaust temperature is not lower than the reference temperature, the fuel adding is controlled so as to discontinue the first fuel adding and to execute only the second fuel adding. <P>COPYRIGHT: (C)2012,JPO&INPIT |
