Title:
排気ガス浄化システムの制御方法及び排気ガス浄化システム
Document Type and Number:
Japanese Patent JP4710564
Kind Code:
B2
Abstract:
The degree of a deterioration in catalyst is determined when the following requirements are satisfied: the operating state of an internal combustion engine (E) is in a predetermined operating state; and the temperature (T1m) of an exhaust gas, which flows into a catalyst (12), is in a second temperature range (”T80) in which the upper limit of the second temperature range (”T80) is 10% below the upper limit of a first temperature range (”T100) between the activation start temperature (Ta) and the activation end temperature (Tb) of the catalyst (12) before a deterioration and the lower limit of the second temperature range (”T80) is 10% above the lower limit of the first temperature range (”T100). A deterioration index temperature (Tic) is regarded as a shift level of light-off characteristics of the catalyst (12) toward the higher temperature side, and the deterioration index temperature (Tic) is added to the reference determination temperature (T0b) before the deterioration, and the sum is used as the determination temperature (T0) for exhaust gas temperature raising control. According to the above constitution, the degree of deterioration of the catalyst (12) can be estimated without using a concentration sensor for an exhaust gas component such as an NOx concentration sensor with high accuracy, and the worsening of the state of the exhaust gas is suppressed while minimizing the worsening of the fuel consumption.
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Inventors:
Daiji Nagaoka
Masashi Kabe
Taketo Imai
Shinji Hara
Masashi Kabe
Taketo Imai
Shinji Hara
Application Number:
JP2005337241A
Publication Date:
June 29, 2011
Filing Date:
November 22, 2005
Export Citation:
Assignee:
Isuzu Motors Limited
International Classes:
F01N3/20; B01D53/86; B01D53/94
Domestic Patent References:
| JP8312336A | ||||
| JP11270327A | ||||
| JP10159543A | ||||
| JP2003214153A | ||||
| JP2004324477A | ||||
| JP9041949A |
Attorney, Agent or Firm:
Shinichi Ogawa
Takashi Noguchi
Kazuhiko Saishita
Takashi Noguchi
Kazuhiko Saishita