Model Based Design Procedure of After Treatment Systems for Non-Road Diesel Engines Univ di Roma Tor Vergata

Format:

Conference/Event

Contributor:

Cordiner, Stefano

mecocci, Francesco

Mulone, Vincenzo

Nobile, Matteo

Conference Name:

10th International Conference on Engines & Vehicles (2011-09-11 : Naples, Italy)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2011

Summary:

In 2011-2013, regulations will be tightened for non-roadvehicles, via the application of Stage III-B standards in Europe.With state-of-the-art technology (high pressure common rail, cooledEGR), non-road diesel engines will require DPFs to control PM, as90% reduction is requested with respect to STAGE III-A standards.Additional challenges may also foresee the obtainment of STAGEIII-B standards with STAGE III-A engine technology, by means ofretrofit systems for PM control. In that case, retrofit systemsmust furthermore guarantee simple control systems, and must berobust especially in terms of limited back pressure increase duringnormal operation. Moreover, retrofit systems must offer flexibilityfrom the design point of view, in order to be correctly operatedwith several engines of same class, possibly characterized bytotally different PM flow rates, temperature, NOx and O₂availability. The design process of such systems appearschallenging itself, as experimental testing cannot be massivelyused to limit costs otherwise leading the product out of anyfeasibility. The design of OEM exhaust systems appears insteaddifferent, as the implementation of more effective regenerationstrategies appears feasible, but time to market is limited and thenefficient design procedures are required to save time andcosts.In the provided background, a model-based design tool,specifically developed for non-road diesel engines at theUniversity of Rome Tor Vergata, is presented in this paper. Thistool is partially based on the use of GT-Power, properly coupled touser-defined models to increase its flexibility as well as toimprove computational efficiency. Moreover, an original clusteringprocedure has been specifically developed to understand the impactof key engine parameters (such as injection timing, EGR, et cetera) onexhaust operating conditions (in terms of mass flow rate, speciesconcentration and temperature), and in turn on exhaust systembehavior. Special care has been given to analyze the wholeengine/exhaust-system performance on a transient basis, andproperly estimate performance on the NRTC (Non-Road TransientCycle).The design procedure was applied to characterize a DOC+DPFafter-treatment system, where the DOC/DPF volume and DOC noblemetal 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

Notes:

Vendor supplied data

Publisher Number:

2011-24-0186

Access Restriction:

Restricted for use by site license