发明名称 GAS SENSOR CONTROL DEVICE
摘要 An O2 sensor includes a sensor element using a solid electrolyte layer and a pair of electrodes placed at a position to interpose the solid electrolyte layer, detects an exhaust gas from an internal combustion engine as an object of a detection, and outputs an electromotive force signal depending on an air-fuel ratio of the exhaust gas. The sensor element is connected with a constant current circuit supplying a constant current that is prescribed. A microcomputer conducts an abnormality diagnosis of an output response of the sensor element on the basis of a state of variation in an electromotive force output. Further, when the microcomputer conducts the abnormality diagnosis, the microcomputer restricts a supply of the constant current by the constant current circuit before conducting the abnormality diagnosis.
申请公布号 US2016202210(A1) 申请公布日期 2016.07.14
申请号 US201415023435 申请日期 2014.09.25
申请人 DENSO CORPORATION 发明人 NAKATA Shingo;MATSUOKA Mikiyasu;MUKAI Yasuo
分类号 G01N27/416;G01N27/407;G01N33/00 主分类号 G01N27/416
代理机构 代理人
主权项 1. A gas sensor control device for a gas sensor which has an electrogenic cell using a solid electrolyte body and a pair of electrodes placed at a position to interpose the solid electrolyte body, and detects an exhaust gas from an internal combustion engine as an object of a detection and outputs an electromotive force signal depending on an air-fuel ratio of the exhaust gas, the gas sensor control device comprising: a constant current supplying section supplying a constant current to the electrogenic cell; a control section controlling the constant current supplying section to supply the constant current to the electrogenic cell in order to change an output characteristic of the electrogenic cell; and an abnormality diagnosing section conducting an abnormality diagnosis of an output response of the electrogenic cell on the basis of a state of variation in an electromotive force output, when the electromotive force output of the electrogenic cell varies, wherein when the abnormality diagnosing section conducts the abnormality diagnosis, the control section restricts a supply of the constant current by the constant current supplying section before conducting the abnormality diagnosis.
地址 Kariya-city JP