To provide an exhaust emission control method and an exhaust emission control system which enable the catalyst of an exhaust emission control device installed in an exhaust passage to quickly reach an activation temperature zone during the warm-up of an engine after the starting, can form a reduction atmosphere, as necessary, on the catalyst of the exhaust emission control device while suppressing the deterioration of fuel consumption after the warm-up of the engine, and can easily achieve a high EGR rate in EGR control.
It is configured to selectively supply a high oxygen-concentration gas A1 or a low oxygen-concentration gas A2 to the gas supply line of a combustor 13 for raising the temperature of the exhaust gas G which is disposed in the exhaust passage 11 of an internal combustion engine 10. While the exhaust gas G is raised in temperature, the high oxygen-concentration gas A2 is supplied to the combustor 13. While the temperature rise of the exhaust gas G is not required, the low oxygen-concentration gas A2 is supplied to the exhaust passage 11. Further, during the EGR, the low oxygen-concentration gas A2 is added to an EGR gas Ge.
| JPS59131821A | 1984-07-28 | |||
| JP2006275020A | 2006-10-12 | |||
| JP2002155740A | 2002-05-31 | |||
| JP2004257323A | 2004-09-16 | |||
| JPH05141229A | 1993-06-08 | |||
| JP2001303941A | 2001-10-31 | |||
| JP2007285281A | 2007-11-01 | |||
| JPS59131821A | 1984-07-28 | |||
| JP2006275020A | 2006-10-12 | |||
| JP2002155740A | 2002-05-31 | |||
| JP2004257323A | 2004-09-16 | |||
| JPH05141229A | 1993-06-08 |
Takashi Noguchi
Kazuhiko Saishita
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