Method and device for monitoring the capability of an exhaust-gas analyzer probe to measure rich gas
US10338026B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 2014 |
| Grant date | Jul 2, 2019 |
| Priority date | — |
| Expiry date | Dec 11, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/007
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for monitoring a capability of an exhaust-gas analyzer probe in an exhaust passage of an internal combustion engine operated with lean combustion to measure rich gas. Exhaust gas is diffused in the exhaust-gas analyzer probe from the exhaust passage via a diffusion barrier into a measuring cavity of the exhaust-gas analyzer probe, and with the aid of a pump cell having an inner pump electrode and a second pump electrode, by applying a pump voltage between the electrodes, oxygen is pumped into or out of the measuring cavity according to a flowing pump current. During a lean operation mode of the internal combustion engine, the pumping direction of the pump cell is reversed during a diagnostic phase and oxygen is pumped into the measuring cavity, and the capability of the exhaust-gas analyzer probe to measure rich gas is inferred from the pump current and/or the pump voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.