NOx detection apparatus and NOx sensor system
US9310331B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 2013 |
| Grant date | Apr 12, 2016 |
| Priority date | — |
| Expiry date | Aug 26, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/0037
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An NOx detection apparatus does not always perform correction processing, but it determines whether to perform the correction processing on the basis of the result of a determination of whether a first Nox concentration is higher than a predetermined specific concentration. The first NOx concentration NOxpo calculated from a second pumping current Ip2 which changes with the actual NOx concentration. Therefore, the NOx detection apparatus can determine whether to correct the first NOx concentration NOxpo in accordance with the actual NOx concentration. Accordingly, the NOx detection apparatus can suppress a decrease in gas detection accuracy even in the case where the gas detection value based on the sensor output involves an error in a specific concentration range (concentration range of 90 ppm or higher).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.