Active has developed a number of Tier
4 products including add-on and tailpipe resonators, which are designed to
provide enhanced sound reduction with
minimal backpressure.
to series production all under one
roof,” said Jennewein.
“Our thermal tubing is typically
used to connect engine or remote-
mounted DPF applications, as well
as on the exhaust exit site where
exposed exhaust could be touched
by the operator or create other heat
hazards. Thermal coatings can be
used where radiant heat is more
of an issue, such as in enclosed or
frame-mounted exhaust applications.
Our thermal barrier heat shielding is
used in applications to avoid debris
collection, protect contact points and
redirect heat away from temperature-
sensitive devices.”
Active also employs aspirator
technology and diffusers in its sys-
tems to reduce hot exhaust gases by
drawing ambient air into the exhaust
stream and lowering the gas velocity
and dispersing the exhaust stream
on exit. Each technology is imple-
mented separately, but when com-
bined, the two systems can provide
a customized heat management
tool incorporating design-controlled
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tunable temperature performance
optimized for engine flow rates and
backpressure requirements, the com-
pany said.
Maintaining maximum exhaust gas
temperature upstream of the aftertreatment is critical for effective performance. In applications employing
DPFs, passive filter regeneration is
maximized and the number of active
filter regeneration cycles — which
can result in fuel economy penalties — is limited. In SCR systems,
temperature management is required
to ensure optimum operating conditions, which are typically below DPF
operating temperatures.
Active Exhaust offers more than
900 different part numbers and its
production output exceeded 1 million units in 2010, Jennewein said.
As 2012 Tier 4 final regulations for
engines from 75 to 174 hp come
closer into view, the company has
begun moving some of its higher-volume products to its 140,000 sq.ft.
partner facility in China in order to
accommodate an increasing demand
at its 180,000 sq.ft. Toronto headquarters facility for custom systems.
As an indication of that demand,
Jennewein said the company has
been awarded supply contracts for
Tier 4 system integration technologies from a pair of North American
global vehicle manufacturers.
“With the introduction of Tier 4
(interim), we have seen an increase
in requests for engineered solutions that meet the thermal management challenges associated with the
employment of aftertreatment technologies,” Jennewein said. “We are
also heavily involved in the design
and testing of Tier 4 final exhaust
management options that demonstrate economic manufacturing and
the cost-effectiveness of leading-edge technology situations.” dp
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