摘要 |
An exhaust gas control apparatus for an internal combustion engine includes: a NOx purification catalyst arranged in an exhaust passage of the internal combustion engine; a degradation degree estimating unit estimating a degradation degree of the NOx purification catalyst; and an air-fuel ratio control unit adjusting an air-fuel ratio of exhaust gas flowing into the NOx purification catalyst, wherein, until the estimated degradation degree of the NOx purification catalyst reaches a predetermined degradation degree, the air-fuel ratio control unit adjusts the air-fuel ratio of the exhaust gas to a rich air-fuel ratio, and, when the estimated degradation degree of the NOx purification catalyst exceeds the predetermined degradation degree, the air-fuel ratio control unit changes the air-fuel ratio of the exhaust gas from the rich air-fuel ratio to a lean air-fuel ratio so that the NOx purification catalyst is regenerated. |
申请人 |
TOYOTA JIDOSHA KABUSHIKI KAISHA;WATANABE, MASAO;TAKAGI, SHIGEHARU;KISHITA, KEISUKE;OTAKE, NOBORU;MORIKAWA, AKIRA;HIROSE, TAKUTO;NAGAI, YASUTAKA |
发明人 |
WATANABE, MASAO;TAKAGI, SHIGEHARU;KISHITA, KEISUKE;OTAKE, NOBORU;MORIKAWA, AKIRA;HIROSE, TAKUTO;NAGAI, YASUTAKA |