Numerical Study on Multiple Injection Strategies in DISI Engines for Particulate Emission Control Magneti Marelli Powertrain SPA

Format:

Conference/Event

Author/Creator:

Bonandrini, Bonandrini, author.

Contributor:

Di Gioia, Rita

Papaleo, Domenico

Venturoli, Luca

Conference Name:

SAE 2012 World Congress & Exhibition (2012-04-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

In this work a numerical analysis of multiple-injection strategyin homogeneous operation in DISI engines is presented.Moving toward Euro 6 emission standards, one of the mainchallenges for GDI engines is the reduction of particulate emissionin terms of mass and particle number. In fact, in stratifiedoperation, the droplets injected during compression stroke maycause a significant amount of soot production, due to locallynon-premixed combustion. Besides, in medium and high load, theliner and piston spray impingement is another possible reason ofproduction of soot emission. In order to meet the requiredperformance and emission targets, focusing on the reduction ofparticulate emission, a multiple injection strategy can beconsidered as an option to control both the mixture stratificationand the wall impingement.In particular, in this work a multiple injection strategy duringintake stroke in homogeneous condition is analyzed. The analysismakes use of advanced simulation tools, which allows to selectparticular strategies to be validated on engine bench. First ofall, starting from a given injection strategy for a DISI engine,some possible methods for splitting injection are considered andtheir feasibility with a particular type of injector is validatedby means of a 1D model of the hydraulic and the complete enginesystems. Then the 1D models are integrated with 3D models of thespray and the engine implemented into the Lib-ICE code, a set oflibrary and applications developed to simulate IC engines using theOpenFOAM® technology. The engine cycle simulation is performed withthe new injection strategies. The advanced CFD computational toolused for the investigation can manage piston and valve motion, fuelinjection, air/fuel mixing and wall film formation so that themixture formation process is effectively evaluated by means of thesimulation. The investigation performed allows to assess the basicadvantages of a multiple injection strategy: the reduction of thewall film impingement and the better air/fuel ratio distribution atthe end of compression, which lead to lower soot formation

Notes:

Vendor supplied data

Publisher Number:

2012-01-0400

Access Restriction:

Restricted for use by site license