Gas sensor control device
US10234418B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 2014 |
| Grant date | Mar 19, 2019 |
| Priority date | — |
| Expiry date | Nov 21, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/0073
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.