Patent · US Active

Method and device for the diagnosis of an NOx sensor for an internal combustion engine

US8401727B2 · kind B2 · utility

12Cited by

4References

19Claims

0Family size

Assignee

CONTINENTAL AUTOMOTIVE GMBH · DE

Inventors

Tino Arlt · Regensburg, DE
Thomas Baumann · Wettingen, CH
Muammer Kilinc · Regensburg, DE
Tim Walde · Regensburg, DE

Key dates

Filing date	Apr 16, 2009
Grant date	Mar 19, 2013
Priority date	—
Expiry date	Mar 1, 2030

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/40
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

In a method and a device for the diagnosis of an NOx sensor (54) for an internal combustion engine, during a homogenous operation of the internal combustion engine, a base diagnostic value (NOx_DIAG_BAS) of the NOx sensor (54) is determined as a function of a reference value (I_REF) of a measuring signal of the NOx sensor (54) determined in a new state of the NOx sensor (54) and a current value (I_AV) of the measuring signal of the NOx sensor (54). A time-dependent measuring value sequence (O2_EG_T) of the oxygen content of the exhaust gas in the exhaust gas system (14) is determined by the exhaust gas probe (53). Depending on the measuring value sequence (O2_EG_T) of the oxygen content of the exhaust gas, and the base diagnostic value (NOx_DIAG_BAS) of the NOx sensor (54), a corrected diagnostic value (NOx_DIAG_COR) is determined for the NOx sensor (54).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.