Title:
METHOD AND DEVICE FOR DETECTING A NOx CONCENTRATION OF AN EXHAUST GAS STREAM PERTAINING TO A COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO2001055565
Kind Code:
A3
Abstract:
The invention relates to a method and a device for detecting a NOx concentration of an exhaust gas stream of a combustion engine by means of a NOx-sensitive measuring device, especially a NOx sensor, that is arranged downstream in relation to a NOx storage catalyst in an exhaust gas section of the combustion engine. According to the invention, a search for a minimum (min) of a signal curve (SK) pertaining to the measuring device (18) is carried out in an operational phase of the combustion engine (10), whereby the NOx concentration passes through a value close to zero on the position of the NOx-sensitive measuring device (18) during said phase. The detected minimum (min) is taken over as the zero point for calibrating the measuring device (18).
Inventors:
HAHN HERMANN (DE)
HINZE SOEREN (DE)
HINZE SOEREN (DE)
Application Number:
PCT/EP2001/000540
Publication Date:
January 10, 2002
Filing Date:
January 18, 2001
Export Citation:
Assignee:
VOLKSWAGEN AG (DE)
HAHN HERMANN (DE)
HINZE SOEREN (DE)
HAHN HERMANN (DE)
HINZE SOEREN (DE)
International Classes:
F02D41/14; F02D41/24; (IPC1-7): F02D41/14; F02D41/24
Foreign References:
| EP0916941A2 | 1999-05-19 | |||
| EP0878709A2 | 1998-11-18 | |||
| EP0969194A2 | 2000-01-05 |
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