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Transient Operation in Different Heavy-Duty Test Cycles as a Special Challenge in the Future
Technical Paper
2007-08-0109
Sector:
Event:
JSAE Spring Conference
Language:
English
Abstract
In the last 5-10 years advances previously considered impossible
have been made in reducing the emissions of diesel engines.
Development and optimization were carried out mainly under
steady-state conditions and the final tuning under the transient
conditions of the transient certification test cycle of the
relevant country, i.e., until recently just the USA.
With the introduction of EU4 in 2005, the Japanese transient
test from 2005 and the likely introduction of the World Harmonized
Transient Cycles (WHTC) with EU6, development will concentrate more
on transient operation and steady-state optimization will reduce in
importance. This trend will become more pronounced as emission
standards are reduced still further and will also lead to changes
in the development methods employed for some areas.
In the following, the existing and future transient tests will
be analyzed and the consequences on the development processes used
and the technologies selected are discussed. The lower the emission
limits, the greater the divergence between the results of
steady-state and transient optimization. The characteristics of the
transient test itself thereby play an important role since the
divergence increases with the proportion of part-load operation in
the test.