公开(公告)号：US5980710A

公开(公告)日：1999-11-09

申请号：US64155

申请日：1998-04-22

申请人： Eiichi Kurokawa ,  Satoshi Hada ,  Tomoo Kawase ,  Toshiyuki Suzuki ,  Satoshi Haseda

发明人： Eiichi Kurokawa ,  Satoshi Hada ,  Tomoo Kawase ,  Toshiyuki Suzuki ,  Satoshi Haseda

IPC分类号： G01N27/41 ,  G01N27/26 ,  G01N27/406

CPC分类号： G01N27/4065 ,  Y10T29/49004 ,  Y10T29/49083 ,  Y10T29/49101

摘要： An A/F sensor generates a current signal corresponding to an air-fuel ratio in response to a voltage applied by a bias control circuit. After a sensor current is received as a voltage signal via a voltage follower, it is outputted to an A/D converter having a predetermined input voltage range, 0 to 5V. A sensor current detection circuit has a plurality of current detection resistors. In order to variably set the resistance value by the sensor current detection circuit, a switch circuit is switched in accordance with the sensor current depending on whether the A/F value to be detected is in the zone near the stoichiometric ratio or in other air-fuel ratio zones.

摘要翻译： 响应于由偏置控制电路施加的电压，A / F传感器产生对应于空燃比的电流信号。 在通过电压跟随器接收到作为电压信号的传感器电流之后，将其输出到具有0至5V的预定输入电压范围的A / D转换器。 传感器电流检测电路具有多个电流检测电阻。 为了通过传感器电流检测电路可变地设置电阻值，根据检测的A / F值是否处于接近化学计量比的区域或其他空气 - 电流检测电路中，根据传感器电流切换开关电路， 燃料比区。