发明名称 |
Air-fuel ratio control system for internal combustion engine |
摘要 |
An air-fuel ratio control system for an internal combustion engine provided with a NOx trap catalyst which is disposed in an exhaust gas passageway and arranged to trap NOx when the air-fuel ratio of exhaust gas flowing to the NOx trap catalyst is lean and to release and reduce trapped NOx when the air-fuel ratio is rich. The air-fuel ratio control system comprises a sensor for detecting an air-fuel ratio of exhaust gas in the exhaust gas passageway downstream of the NOx trap catalyst. Additionally, a control circuit is provided and configured to cause the engine to operate at a rich air-fuel ratio to accomplish a rich air-fuel ratio engine operation after an engine operation at a lean air-fuel ratio, and continue the rich air-fuel ratio engine operation for a duration even after the sensor has detected that the air-fuel ratio of exhaust gas is rich.
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申请公布号 |
US2002194838(A1) |
申请公布日期 |
2002.12.26 |
申请号 |
US20020163427 |
申请日期 |
2002.06.07 |
申请人 |
NISSAN MOTOR CO., LTD. |
发明人 |
SATO KENICHI;KUBO KENGO;NISHIZAWA KIMIYOSHI |
分类号 |
F01N3/08;F01N3/20;F01N3/24;F01N3/28;F02D41/00;F02D41/02;F02D41/04;F02D41/14;(IPC1-7):F01N3/00;F01N3/10 |
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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