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Model Based Design Procedure of After Treatment Systems for Non-Road Diesel Engines
Technical Paper
2011-24-0186
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In 2011-2013, regulations will be tightened for non-road
vehicles, via the application of Stage III-B standards in Europe.
With state-of-the-art technology (high pressure common rail, cooled
EGR), non-road diesel engines will require DPFs to control PM, as
90% reduction is requested with respect to STAGE III-A standards.
Additional challenges may also foresee the obtainment of STAGE
III-B standards with STAGE III-A engine technology, by means of
retrofit systems for PM control. In that case, retrofit systems
must furthermore guarantee simple control systems, and must be
robust especially in terms of limited back pressure increase during
normal operation. Moreover, retrofit systems must offer flexibility
from the design point of view, in order to be correctly operated
with several engines of same class, possibly characterized by
totally different PM flow rates, temperature, NOx and O₂
availability. The design process of such systems appears
challenging itself, as experimental testing cannot be massively
used to limit costs otherwise leading the product out of any
feasibility. The design of OEM exhaust systems appears instead
different, as the implementation of more effective regeneration
strategies appears feasible, but time to market is limited and then
efficient design procedures are required to save time and
costs.
In the provided background, a model-based design tool,
specifically developed for non-road diesel engines at the
University of Rome Tor Vergata, is presented in this paper. This
tool is partially based on the use of GT-Power, properly coupled to
user-defined models to increase its flexibility as well as to
improve computational efficiency. Moreover, an original clustering
procedure has been specifically developed to understand the impact
of key engine parameters (such as injection timing, EGR, etc.) on
exhaust operating conditions (in terms of mass flow rate, species
concentration and temperature), and in turn on exhaust system
behavior. Special care has been given to analyze the whole
engine/exhaust-system performance on a transient basis, and
properly estimate performance on the NRTC (Non-Road Transient
Cycle).
The design procedure was applied to characterize a DOC+DPF
after-treatment system, where the DOC/DPF volume and DOC noble
metal loading have been assumed the main design parameters.
Obtained results finally led to the selection of two layouts,
respectively for after-market (retrofit) and OEM applications.
Authors
Topic
Citation
Cordiner, S., mecocci, F., Mulone, V., and Nobile, M., "Model Based Design Procedure of After Treatment Systems for Non-Road Diesel Engines," SAE Technical Paper 2011-24-0186, 2011, https://doi.org/10.4271/2011-24-0186.Also In
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