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Title: System and method for diagnosing EGR performance using NOx sensor

Abstract

A method and system for diagnosing a condition of an EGR valve used in an engine system. The EGR valve controls the portion exhaust gases produced by such engine system and fed back to an intake of such engine system. The engine system includes a NOx sensor for measuring NOx in such exhaust. The method includes: determining a time rate of change in NOx measured by the NOx sensor; comparing the determined time rate of change in the measured NOx with a predetermined expected time rate of change in measured NOx; and determining the condition of the EGR valve as a function of such comparison. The method also includes: determining from NOx measured by the NOx sensor and engine operating conditions indications of instances when samples of such measured NOx are greater than an expected maximum NOx level for such engine condition and less than an expected minimum NOx level for such engine condition; and determining the condition of the EGR valve as a function of a statistical analysis of such indications. The method includes determining whether the NOx sensor is faulty and wherein the EGR condition determining includes determining whether the NOx sensor is faulty.

Inventors:
Issue Date:
Research Org.:
Ford Global Technologies, LLC, Dearborn, MI (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1174639
Patent Number(s):
6,666,201
Application Number:
10/063,955
Assignee:
Ford Global Technologies, LLC (Dearborn, MI)
DOE Contract Number:  
FC26-01NT41103
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Mazur, Christopher John. System and method for diagnosing EGR performance using NOx sensor. United States: N. p., 2003. Web.
Mazur, Christopher John. System and method for diagnosing EGR performance using NOx sensor. United States.
Mazur, Christopher John. Tue . "System and method for diagnosing EGR performance using NOx sensor". United States. https://www.osti.gov/servlets/purl/1174639.
@article{osti_1174639,
title = {System and method for diagnosing EGR performance using NOx sensor},
author = {Mazur, Christopher John},
abstractNote = {A method and system for diagnosing a condition of an EGR valve used in an engine system. The EGR valve controls the portion exhaust gases produced by such engine system and fed back to an intake of such engine system. The engine system includes a NOx sensor for measuring NOx in such exhaust. The method includes: determining a time rate of change in NOx measured by the NOx sensor; comparing the determined time rate of change in the measured NOx with a predetermined expected time rate of change in measured NOx; and determining the condition of the EGR valve as a function of such comparison. The method also includes: determining from NOx measured by the NOx sensor and engine operating conditions indications of instances when samples of such measured NOx are greater than an expected maximum NOx level for such engine condition and less than an expected minimum NOx level for such engine condition; and determining the condition of the EGR valve as a function of a statistical analysis of such indications. The method includes determining whether the NOx sensor is faulty and wherein the EGR condition determining includes determining whether the NOx sensor is faulty.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2003},
month = {12}
}

Patent:

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