Patent · US Active

Method for specifying a malfunction of an exhaust gas recirculation system of an internal combustion engine of a motor vehicle and corresponding diagnostic device

US9360394B2 · kind B2 · utility

11Cited by

6References

9Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Andreas Walter · Egloffstein, DE
Heiko Lenhardt · Schifferstadt, DE
Michael Hackner · Erbach, DE
Johannes Zeidler

Key dates

Filing date	Dec 27, 2012
Grant date	Jun 7, 2016
Priority date	—
Expiry date	Jun 11, 2033

Classification

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

Abstract

A method for specifying a malfunction of an exhaust gas recirculation system of an internal combustion engine of a motor vehicle, including: setting a first operating point of the engine and a first operating state of the fresh air/exhaust gas system as vehicle conditioning in a first measurement setting; measuring volumetric efficiencies of the engine for the first measurement setting and for at least one additional measurement setting, and comparing the measured volumetric efficiencies with an engine characteristics map stored in a memory unit for volumetric efficiency values of the engine, and ascertaining whether a malfunction is present during the exhaust gas recirculation process based on the comparison; and specifying the malfunction of the exhaust gas recirculation system while taking into account the measuring results for the first measurement setting and for the at least one additional measurement setting and the stored engine characteristics map for volumetric efficiency values.

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