发明名称 |
Method for managing NOx catalyst |
摘要 |
In a diesel engine, prior to a sulfur discharging process, a pre-process is performed to decrease the air-fuel ratio of the air-fuel mixture that is to be burned in the engine so that the air-fuel ratio A/FEHT of the exhaust gas reaches a predetermined pre-process value alpha . The time required for the air-fuel ratio A/FEHT of the exhaust gas to stabilize near the pre-process value alpha is set as a stand-by time TS. The sulfur discharging process starts after the stand-by time elapses. This enhances the convergence of the air-fuel ratio A/FEHT to the target value during the sulfur discharging process. If a predetermined condition is satisfied, the stand-by time is cancelled to start the sulfur discharging process when or just after the pre-process is started. This efficiently processes the sulfur components accumulated in a NOx storage catalyst, which is arranged in an exhaust passage of the engine, without deteriorating the exhaust gas property. <IMAGE> |
申请公布号 |
EP1469180(A2) |
申请公布日期 |
2004.10.20 |
申请号 |
EP20040008984 |
申请日期 |
2004.04.15 |
申请人 |
TOYOTA JIDOSHA KABUSHIKI KAISHA;KABUSHIKI KAISHA TOYOTA JIDOSHOKKI |
发明人 |
SUGIYAMA, TATSUMASA;TSUZUKI, MASATO;ISHIKAWA, MASAHIKO;KOBAYASHI, NOBUKI;TAHARA, JUN;KATO, HIDENAGA |
分类号 |
F02M25/07;F01N3/08;F01N3/20;F01N3/24;F02D21/08;F02D41/00;F02D41/02;F02D41/04;F02D41/14;F02D41/30;F02D43/00;F02D45/00 |
主分类号 |
F02M25/07 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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