发明名称 |
EXHAUST GAS CONTROL APPARATUS FOR INTERNAL COMBUSTION ENGINE |
摘要 |
A three-way catalyst (20) and an NO x adsorption catalyst (22) are disposed in an engine exhaust passage. In a predetermined low-load engine operation area, combustion in a combustion chamber (5) is carried out at a lean base air-fuel ratio and an air-fuel ratio in the combustion chamber (5) is changed to a rich range at the time of discharging NO x from the NO x adsorption catalyst (22). In a predetermined high-load engine operation area, the air-fuel ratio in the combustion chamber (5) is controlled to a theoretical air-fuel ratio in a feedback manner. In a predetermined middle-load engine operation area, the combustion in the combustion chamber (5) is carried out at the base air-fuel ratio lower than the base air-fuel ratio in the low-load engine operation area and the air-fuel ratio in the combustion chamber (5) is changed to the rich range with a period shorter than a rich period of the air-fuel ratio for discharging NO x in the low-load engine operation area. |
申请公布号 |
CA2879957(C) |
申请公布日期 |
2017.02.14 |
申请号 |
CA20122879957 |
申请日期 |
2012.07.27 |
申请人 |
TOYOTA JIDOSHA KABUSHIKI KAISHA |
发明人 |
BISAIJI, YUKI;YOSHIDA, KOHEI;SAKURAI, KENJI;NAKAMURA, KOHKI |
分类号 |
F01N3/08;F02D41/04 |
主分类号 |
F01N3/08 |
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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