发明名称 |
Deterioration diagnostic system of exhaust gas purifying catalyst |
摘要 |
A deterioration diagnostic system of an exhaust gas purifying catalyst includes: an upstream side switching frequency calculator calculating the number of times of switching on the upstream side; a reference value calculator calculating a downstream side rich/lean determination level having a first width; a downstream side rich/lean determination level adjuster setting the first width to a second larger width when the number of times of switching on the upstream side is smaller than a predetermined value; a downstream side switching frequency calculator calculating the number of times of switching on the downstream side; a frequency ratio calculator calculating a frequency ratio between the number of times of switching on the downstream side and the number of times of switching on the upstream side; and a deterioration determiner determining the deterioration of the exhaust gas purifying catalyst when the frequency ratio is larger than a predetermined value.
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申请公布号 |
US7739868(B2) |
申请公布日期 |
2010.06.22 |
申请号 |
US20070797864 |
申请日期 |
2007.05.08 |
申请人 |
MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA |
发明人 |
CHINO DAISUKE;SAITO KENJI;KAMURA HITOSHI |
分类号 |
F01N3/00;B01D53/94;F01N3/20;F01N3/24;F02D45/00 |
主分类号 |
F01N3/00 |
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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