发明名称 |
Method for detecting deterioration of catalyst and measuring conversion efficiency thereof with an air/fuel ratio sensor |
摘要 |
The invention provides a method for accurately and precisely detecting deterioration of a catalyst and measuring a conversion efficiency of a catalyst for HC/CO/NOx by using an oxygen sensor and an air/fuel ratio sensor disposed on the upstream and downstream sides of the catalyst, respectively. The catalyst is determined to be deteriorating when an output amplitude of the air/fuel ratio sensor becomes greater than a predetermined value. The conversion efficiency of the catalyst is determined based on a predetermined relationship between the output amplitude and the mean converted rate of HC/CO/NOx.
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申请公布号 |
US5357750(A) |
申请公布日期 |
1994.10.25 |
申请号 |
US19930001225 |
申请日期 |
1993.01.06 |
申请人 |
NGK SPARK PLUG CO., LTD. |
发明人 |
ITO, YASUO;HAYAKAWA, NOBUHIRO;YAMADA, TESSHO |
分类号 |
F01N11/00;(IPC1-7):F01N3/20 |
主分类号 |
F01N11/00 |
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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