发明名称 |
An air/fuel ratio detecting apparatus for internal combustion engines. |
摘要 |
<p>In an A/F ratio sensor of mixture supplied for an internal combustion engine, which has a detector for detecting the concentration of residual oxygen in exhaust gas and determines the A/F ratio by retrieving an air excess ratio table with an output of the detector, there is further provided an additional air introducing device, which introduces a predetermined quantity of air into the engine for a certain period of time, under the condition that the velocity of air flowing through a throttle valve is equal to the sonic velocity. The oxygen concentration detector is calibrated by the comparison of the outputs thereof before and after introduction of the additional air.</p><p>According to this invention, the A/F ratio of the mixture can be detected accurately without the influence of the aged deterioration of the oxygen concentration</p> |
申请公布号 |
EP0221305(A2) |
申请公布日期 |
1987.05.13 |
申请号 |
EP19860112822 |
申请日期 |
1986.09.17 |
申请人 |
HITACHI, LTD. |
发明人 |
YAMAMOTO, TADAHIRO;OHNISHI, EIICHI;OOTA, TADAKI;OOGANE, HIROAKI;OSUGA, MINORU;OYAMA, YOSHISHIGE |
分类号 |
F02D35/00;F02D41/14;G01N27/406;(IPC1-7):G01N27/00 |
主分类号 |
F02D35/00 |
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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