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Title: Exhaust emission control and diagnostics

Abstract

A diesel engine emission control system uses an upstream oxidation catalyst and a downstream SCR catalyst to reduce NOx in a lean exhaust gas environment. The engine and upstream oxidation catalyst are configured to provide approximately a 1:1 ratio of NO to NO2 entering the downstream catalyst. In this way, the downstream catalyst is insensitive to sulfur contamination, and also has improved overall catalyst NOx conversion efficiency. Degradation of the system is determined when the ratio provided is no longer near the desired 1:1 ratio. This condition is detected using measurements of engine operating conditions such as from a NOx sensor located downstream of the catalysts. Finally, control action to adjust an injected amount of reductant in the exhaust gas based on the actual NO to NO2 ratio upstream of the SCR catalyst and downstream of the oxidation catalyst.

Inventors:
;
Issue Date:
Research Org.:
Ford Global Technologies, LLC, Dearborn, MI (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1175983
Patent Number(s):
7134273
Application Number:
10/064,957
Assignee:
Ford Global Technologies, LLC (Dearborn, MI)
Patent Classifications (CPCs):
F - MECHANICAL ENGINEERING F01 - MACHINES OR ENGINES IN GENERAL F01N - GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02T - CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
DOE Contract Number:  
FC26-01NT41103
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS

Citation Formats

Mazur, Christopher John, and Upadhyay, Devesh. Exhaust emission control and diagnostics. United States: N. p., 2006. Web.
Mazur, Christopher John, & Upadhyay, Devesh. Exhaust emission control and diagnostics. United States.
Mazur, Christopher John, and Upadhyay, Devesh. Tue . "Exhaust emission control and diagnostics". United States. https://www.osti.gov/servlets/purl/1175983.
@article{osti_1175983,
title = {Exhaust emission control and diagnostics},
author = {Mazur, Christopher John and Upadhyay, Devesh},
abstractNote = {A diesel engine emission control system uses an upstream oxidation catalyst and a downstream SCR catalyst to reduce NOx in a lean exhaust gas environment. The engine and upstream oxidation catalyst are configured to provide approximately a 1:1 ratio of NO to NO2 entering the downstream catalyst. In this way, the downstream catalyst is insensitive to sulfur contamination, and also has improved overall catalyst NOx conversion efficiency. Degradation of the system is determined when the ratio provided is no longer near the desired 1:1 ratio. This condition is detected using measurements of engine operating conditions such as from a NOx sensor located downstream of the catalysts. Finally, control action to adjust an injected amount of reductant in the exhaust gas based on the actual NO to NO2 ratio upstream of the SCR catalyst and downstream of the oxidation catalyst.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2006},
month = {11}
}

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Works referenced in this record:

Urea-SCR: a promising technique to reduce NOx emissions from automotive diesel engines
journal, June 2000