公开(公告)号：US4751907A

公开(公告)日：1988-06-21

申请号：US906949

申请日：1986-09-15

申请人： Tadahiro Yamamoto ,  Eiichi Ohnishi ,  Tadaki Oota ,  Hiroaki Oogane ,  Minoru Osuga ,  Yoshishige Oyama

发明人： Tadahiro Yamamoto ,  Eiichi Ohnishi ,  Tadaki Oota ,  Hiroaki Oogane ,  Minoru Osuga ,  Yoshishige Oyama

IPC分类号： F02D35/00 ,  F02D41/14 ,  G01N27/406 ,  G01N31/22

CPC分类号： G01N27/4065 ,  F02D35/003 ,  F02D41/2441 ,  F02D41/2474 ,  F02D41/2454

摘要： 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. 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.

摘要翻译： 在供给用于内燃机的混合物的A / F比传感器中，其具有用于检测废气中的残余氧浓度的检测器，并且通过用检测器的输出检索空气过剩率表来确定A / F比 进一步提供了一种额外的空气引入装置，其在流过节流阀的空气的速度等于声速的条件下，将预定量的空气引入发动机中一段时间​​。 通过在引入附加空气之前和之后的输出的比较来校准氧浓度检测器。 根据本发明，可以准确地检测混合物的A / F比，而不会受到氧浓度老化的影响。