发明名称 |
EXHAUST PURIFICATION DEVICE FOR SPARK IGNITION INTERNAL COMBUSTION ENGINE |
摘要 |
A three-way catalyst (20) having an oxygen storage function and an exhaust purification catalyst (22) are arranged in the exhaust passage of an internal combustion engine. During medium-load operation of the engine the degree of lean of the air-fuel ratio in the combustion chamber (5) is increased so as to increase the oxygen storage amount of the three-way catalyst (20) to the maximum oxygen storage amount, and the air-fuel ratio in the combustion chamber (5) even after the oxygen storage amount of the three-way catalyst (20) has reached the maximum oxygen storage amount is maintained at lean, after which the air-fuel ratio is returned to rich, and at this time, as the amount of poisoning of a noble metal catalyst when the air-fuel ratio in the combustion chamber (5) is rich increases, the amount of time for which the air-fuel ratio in the combustion chamber (5) is maintained at lean is increased. |
申请公布号 |
EP2891777(B1) |
申请公布日期 |
2016.11.16 |
申请号 |
EP20120883497 |
申请日期 |
2012.08.28 |
申请人 |
TOYOTA JIDOSHA KABUSHIKI KAISHA |
发明人 |
INOUE, MIKIO;YOSHIDA, KOHEI;BISAIJI, YUKI;SAKURAI, KENJI;NAKAMURA, KOHKI |
分类号 |
F01N3/20;F01N3/06;F02D41/02 |
主分类号 |
F01N3/20 |
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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