Truck & Off-Highway Engineering - December 2024 - 17

POWERTRAIN FEATURE
Tenneco worked with Eaton on an integrated
exhaust thermal management system that
rapidly heats and maintains the emission
control system temperature.
k1
LPG typically offers an approximate 5
to 10% reduction in carbon dioxide emissions
when compared to traditional diesel
fuel. " There is a potential to leverage rDME
(renewable dimethyl ether) blends and
renewable propane with this new technology
to achieve net-zero carbon emissions, "
said Srinu Gunturu, Stanadyne's
chief engineer. Technology is ready for the
commercialization of LPG direct-injection
engines, according to Gunturu.
Emission controls
Three-way catalysts have been in the
marketplace since the 1970s and the
technology has evolved over the decades.
" We need catalysts that can
work at low temperature ranges as well
as be durable in high temperatures. This
is really an ongoing challenge - in a
good way - for us in our catalyst development, "
said Louise Arnold, product
line manager for Johnson Matthey, a
207-year-old company with 50-plus
years of emissions control expertise.
A next-generation three-way catalyst
from Johnson Matthey achieves a faster
light-off for improved emissions performance
and a 30% cost reduction for
PGM (platinum group metals). Arnold
also noted that particulate filter applications
for gasoline engines are revving
up. " This is established technology for
the European and China markets, so it's
exciting for us to start seeing this application
in North America, " Arnold said.
Nick Morley, Tenneco's engineering
TRUCK & OFF-HIGHWAY ENGINEERING
director for controls and advanced
technology, gave a snapshot overview
of three emissions-reduction technologies:
a fuel burner, an electric heater,
and a dual dosing and advanced mixing
system. The fuel burner rapidly heats
the aftertreatment to maximize efficiency,
enabling the engine to transition
to fuel-economy mode sooner. In one
example, a six-minute improvement was
achieved on a diesel-engine commercial
truck fitted with a fuel burner.
" It does depend on the test cycle, but
neutrality with a nearly
you can have CO2
90% improvement in NOx with a [fuel]
burner, " Morley said.
For vehicles with a 48-volt battery
architecture, an electric heater is an
option " that's a simpler integration versus
a fuel burner, " according to Morley.
For a plug-in hybrid vehicle, an electric
heater can have a near-zero impact on
fuel economy, and multiple heaters can
be used if needed.
A dual-dosing SCR (selective catalytic
reduction) system, another option
for diesel engines, essentially brings the
SCR closer to the engine, taking advantage
of the available heat. The technology
offers packaging flexibility and provides
NO2
/NOx ratio controls for passive
regeneration.
" There certainly are a lot of proven
technologies - not only in the aftertreatment
space but also in the fuels and engine
realm - that can allow us to meet
our emissions targets both today and
tomorrow, " Morley said.
buywesgarde.com
otto-controls.com
December 2024 17
hall
effect
fnr
rocker
all products
AVAILABLE now at
wesgarde!
Sealed
Rocker
switch
P3
push
button
TENNECO
http://info.hotims.com/86284-703
Truck & Off-Highway Engineering - December 2024

Table of Contents for the Digital Edition of Truck & Off-Highway Engineering - December 2024
