APBF-DEC NOx Adsorber/DPF Project: Light-Duty Passenger Car Platform Page: 1 of 6
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Proceedings of Diesel Engine Emissions Reduction (DEER) Conference
August 25, 2003, Newport RI
APBF-DEC NOx Adsorber/DPF Project: Light-Duty Passenger
Dean Tomazic and Marek Tatur
FEV Engine Technology, Inc.
National Renewable Energy Laboratory
A 1.9L turbo direct injection (TDI) diesel engine was
modified to achieve the upcoming Tier 2 Bin 5
emission standard in combination with a NOx
adsorber catalyst (NAC) and a diesel particulate
filter (DPF). The primary objective for developing
this test bed is to investigating the effects of
different fuel sulfur contents on the performance of
an advanced emission control system (ECS) in a
During the development process, the engine-out
emissions were minimized by applying a state-of-
the-art combustion system in combination with
cooled exhaust gas recirculation (EGR). The
subsequent calibration effort resulted in emission
levels requiring 80-90 percent nitrogen-oxide (NOx)
and particulate matter (PM) conversion rates by the
The strategy development included ean/rich
modulation for NAC regeneration, as well as, the
desulfurization of the NAC and the regeneration of
Two slightly different ECS were investigated and
calibrated. The initial vehicle results in an Audi A4
station wagon over the federal test procedure
(FTP), US 06, and the highway fuel economy test
(HFET) cycle indicate the potential of these
configuration to meet the future Tier 2 emission
Due to a desire to reduce dependence on foreign
oil, the diesel engine is becoming a prime
candidate for future medium-duty vehicle
applications in the US. The diesel engine exhibits
high thermal efficiency and superior durability
compared to the gasoline engine. The main
obstacle to increased use of diesel engines is the
upcoming (extremely stringent) EPA Tier 2
emission standards. To succeed, these vehicles
must comply with emission standards while
maintaining their excellent fuel economy. The
availability of technologies such as common rail
fuel injection systems, low sulfur diesel fuel, NACs,
and DPFs allow the development of powertrain
systems with the potential to comply with targeted
requirements. In support of this, the US
Department of Energy (DOE) has undertaken
several test projects as part of their Advanced
Petroleum Based Fuels - Diesel Emission Control
(APBF-DEC) activity. Primary questions among
those addressed by these projects are sulfur
tolerance, durability, and performance of the NOx
adsorber/DPF system for varying fuel sulfur levels.
The test bed for one project in their activity is an
Audi A4 Avant equipped with a 1.9L prototype TDI
engine with common rail fuel injection.
While NAC systems have demonstrated extremely
high levels of NOx reduction in steady-state
laboratory evaluations, the application of NAC
systems to actual transient engine applications
requires development of an integrated engine-
emissions management system. This paper
discusses the integrated engine-emissions system
management, and the development of regeneration
control strategies. Performance of fresh and aged
systems tested over the FTP, HFET, and USO6 test
cycles will also be summarized, including emissions
of regulated and presently unregulated species.
Engine testing was performed using a prototype
1.9L state-of-the-art TDI diesel engine in
combination with a customized control system
including an electronic control unit (ECU) bypass
environment. The engine is turbocharged and
intercooled. In addition, it is equipped with a
customized cooled EGR system allowing for high
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Tomazic, D; Tatur, M & Thornton, M. APBF-DEC NOx Adsorber/DPF Project: Light-Duty Passenger Car Platform, article, August 24, 2003; United States. (digital.library.unt.edu/ark:/67531/metadc783605/m1/1/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.