Patent · US Expired

Diagnostic device for monitoring an exhaust gas recirculation system of an internal combustion engine

US6044826A · kind A · utility

25Cited by

4References

10Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Klaus Bayerle · Obertraubling, DE
Stefan Schneider · Aachen, DE
Hong Zhang · Tegernheim, DE
Maximilian Engl · Friedberg, DE

Key dates

Filing date	Mar 1, 1999
Grant date	Apr 4, 2000
Priority date	—
Expiry date	Mar 1, 2019

Classification

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

Abstract

A diagnostic device for monitoring an exhaust gas recirculation system determines a diagnostic value of the exhaust gas recirculation system without influencing the operation of the internal combustion engine. The diagnostic value depends on the intake pipe pressure and an observer intake pipe pressure. The latter is determined by an observer from one or more further operating variables of the internal combustion engine. The diagnostic device determines that the exhaust gas recirculation system is defective when the diagnostic value lies outside a range of values that depend on at least one operating variable.

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