发明名称 |
Emission control apparatus for engine and method for reducing emissions of engine |
摘要 |
An emission control apparatus for an engine has a plurality of catalysts disposed in series in an exhaust passage. An HC absorbent catalyst is utilized for at least one of the catalysts. An ECU controls an A/F ratio in an upstream side of the HC absorbent catalyst at a target value. The target value is corrected to a leaner value when the HC absorbent catalyst is in a desorbing condition. The leaner value is leaner than the target value during the HC absorbent catalyst is in an absorbing condition or an activated condition. The leaner atmosphere provides sufficient of oxygen to purify desorbed HC from the HC absorbent catalyst itself. |
申请公布号 |
US6601383(B2) |
申请公布日期 |
2003.08.05 |
申请号 |
US20020045026 |
申请日期 |
2002.01.15 |
申请人 |
DENSO CORPORATION |
发明人 |
HASEGAWA JUN;SHIMIZU KOUICHI;IIDA HISASHI |
分类号 |
F02D45/00;F01N3/08;F01N3/20;F01N3/24;F01N11/00;F01N13/02;F02D41/02;F02D41/14;(IPC1-7):F01N3/00 |
主分类号 |
F02D45/00 |
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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