| US 7,497,078 B2 | ||
| Exhaust emission control device of internal combustion engine | ||
| Satoshi Hiranuma, Tochigi (Japan); Ritsuko Shinozaki, Tochigi (Japan); Yoshinori Takahashi, Tochigi (Japan); Yoshinaka Takeda, Tochigi (Japan); Reiko Doumeki, Tochigi (Japan); Shinichi Saito, Tochigi (Japan); Toru Kawatani, Tochigi (Japan); Takeshi Hashizume, Shizuoka (Japan); and Kenji Kawai, Aichi (Japan) | ||
| Assigned to Mitsubishi Fuso Truck and Bus Corporation, Tokyo (Japan) | ||
| Appl. No. 10/531,329 PCT Filed Oct. 16, 2003, PCT No. PCT/JP03/13221 § 371(c)(1), (2), (4) Date Sep. 16, 2005, PCT Pub. No. WO2004/036002, PCT Pub. Date Apr. 29, 2004. |
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| Claims priority of application No. 2002-301366 (JP), filed on Oct. 16, 2002. | ||
| Prior Publication US 2006/0107658 A1, May 25, 2006 | ||
| Int. Cl. F01N 3/00 (2006.01) | ||
| U.S. Cl. 60—295 [60/297; 60/311] | 4 Claims |
| 1. An exhaust gas purifying system for an internal combustion engine, comprising:
an exhaust-after-treatment device disposed in an exhaust system of the internal combustion engine, and including a particulate
filter configured to collect particulates from exhaust gas, and an NO2 generating unit upstream of or in the particulate filter;
an excess air ratio frequency calculating unit configured to calculate an excess air ratio frequency at which an excess air
ratio is equal to or less than a predetermined value during the operation of the internal combustion engine;
a discharged particulate amount calculating unit configured to calculate an amount of discharged particulates on the basis
of an excess air ratio frequency at which an excess air ratio is equal or less than a predetermined excess air ratio;
a filter temperature frequency calculating unit configured to calculate a filter temperature frequency at which the temperature
of exhaust gas in front of the particulate filter or the temperature of the particulate filter is equal to higher than a predetermined
value;
a burnt particulate amount calculating unit configured to calculate an amount of burnt particulates on the basis of the filter
temperature frequency; and
a particulate accumulation amount calculating unit configured to calculate an amount of particulates on the particulate filter
on the basis of the calculated amount of discharged particulates and the calculated amount of burnt particulates.
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