发明名称 |
Method for controlling engine exhaust gas system |
摘要 |
<p>A method for controlling an engine exhaust gas system includes the steps of detecting an air-fuel ratio of exhaust gas discharged from an internal engine by an oxygen sensor, controlling the exhaust gas to near the stoichiometric air-fuel ratio by a closed-loop control referring to a resultant signal, and leading the exhaust gas to a three-way catalyst to treat nitrogen oxide, hydrocarbon and carbon monoxide. A nitrogen oxide sensor is provided downstream of the three-way catalyst, and a control value of air-fuel ratio by a closed loop control by the oxygen sensor is corrected to set the nitrogen oxide concentration to a predetermined value in accordance with an output of the nitrogen oxide sensor. The deterioration of the three-way catalyst and/or oxygen sensor is detected by comparing a change in control corrected value for the air-fuel ratio of closed loop control referring to an output of the nitrogen oxide sensor with a predetermined value. <IMAGE></p> |
申请公布号 |
EP0814249(A2) |
申请公布日期 |
1997.12.29 |
申请号 |
EP19970304349 |
申请日期 |
1997.06.20 |
申请人 |
NGK INSULATORS, LTD. |
发明人 |
KATO, NOBUHIDE;KURACHI, HIROSHI |
分类号 |
G01N27/26;B01D53/94;F01N11/00;F02D41/14;F02D45/00;G01N27/416;G01N27/417;(IPC1-7):F02D41/14;G01N27/406;G01N27/419;F02D41/22 |
主分类号 |
G01N27/26 |
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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