发明名称 |
Exhaust gas aftertreatment systems |
摘要 |
A system and a method for effective NOx and particulate matter control in a diesel or other lean burn internal combustion engine is presented. The system includes a urea-based SCR catalyst having an oxidation catalyst coupled upstream of it and a particulate filter coupled downstream of the SCR catalyst. The particulate filter regeneration method teaches controlling operating conditions to bring the particulate filter temperature in the range where exothermic reaction between hydrocarbon and oxygen occurs. Once this is accomplished, extra hydrocarbons are injected into the exhaust gas entering the particulate filter where they combust and the resulting exotherm regenerates the filter. This method achieves effective particulate matter control while eliminating the risk of thermal damage to the upstream devices and minimizing regeneration fuel economy penalty. |
申请公布号 |
US2004098979(A1) |
申请公布日期 |
2004.05.27 |
申请号 |
US20020301043 |
申请日期 |
2002.11.21 |
申请人 |
HAMMERLE ROBERT HENRY;LAMBERT CHRISTINE KAY;LAING PAUL M.;TENNISON PAUL JOSEPH;RUONA WILLIAM CHARLES |
发明人 |
HAMMERLE ROBERT HENRY;LAMBERT CHRISTINE KAY;LAING PAUL M.;TENNISON PAUL JOSEPH;RUONA WILLIAM CHARLES |
分类号 |
F01N3/20;F01N3/30;F01N13/02;F02M69/08;(IPC1-7):F01N3/00;F01N3/02 |
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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