Diagnostic method and device for operating an internal combustion engine
US8297040B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 4, 2008 |
| Grant date | Oct 30, 2012 |
| Priority date | — |
| Expiry date | Mar 15, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An internal combustion engine has an exhaust gas catalyst, a first exhaust gas sensor that is arranged in such a manner that it can be used in lambda control, and a second exhaust gas sensor that is arranged in such a manner that it can be used in trim control. A HC quality value (EFF_CAT_HC) which is representative of an oxygen storage capacity of the exhaust gas catalyst is determined depending on a measuring signal (VLS_DOWN) of the second exhaust gas sensor. A NOx correction factor (COR_NOX) is determined depending on the measuring signal (VLS_DOWN) of the second exhaust gas sensor, namely depending on signal portions that are representative of the residual oxygen. A NOx quality value (EFF_CAT_DIAL_NOX) is determined depending on the HC quality value (EFF_CAT_HC) and the NOx correction factor (COR_NOX).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.