Reducing Fuel Consumption, Noxious Emissions and Radiated Noise by Selection of the Optimal Control Strategy of a Diesel Engine Istituto Motori CNR - Italy

Format:

Conference/Event

Author/Creator:

Siano, Siano, author.

Contributor:

Bozza, Fabio

Costa, Michela

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:

Despite the recent efforts devoted to develop alternativetechnologies, it is likely that the internal combustion engine willremain the dominant propulsion system for the next 30 years andbeyond. Also as a consequence of more and more stringent emissionsregulations established in the main industrialized countries,strongly demanded are methods and technologies able to enhance theinternal combustion engines performance in terms of both efficiencyand environmental impact.Present work focuses on the development of a numerical methodfor the optimization of the control strategy of a diesel engineequipped with a high pressure injection system, a variable geometryturbocharger and an EGR circuit. A preliminary experimentalanalysis is presented to characterize the considered six-cylinderengine under various speeds, loads and EGR ratios. The fuelinjection system is separately tested on a dedicated test bench, todetermine the instantaneous fuel injection rate for differentinjection strategies. The collected data are employed for tuningproper numerical models, able to reproduce the engine behavior interms of performances (in-cylinder pressure, boost pressure,air-flow rate, fuel consumption), noxious emissions (soot, NO) andradiated noise. In particular, a 1D tool is developed with the aimof characterizing the flow in the intake and exhaust systems andpredicting the engine-turbocharger matching conditions, byincluding a short-route EGR circuit; a 3D model (AVL Fire) isassessed to reproduce into detail the in-cylinder thermo-fluiddynamic processes, including mixture formation, combustion, andmain pollutants production; an in-house routine, also validatedagainst available data, is finally developed for the prediction ofthe combustion noise, starting from in-cylinder pressure cycles.Obviously, data exchange between the codes is previewed.The overall numerical procedure is firstly checked withreference to the experimentally analyzed operating points. The 1D,3D and combustion noise models are then coupled to an externaloptimizer (ModeFRONTIER) in order to select the optimalcombination of the engine control parameters to improve the engineperformance and to contemporary minimize noise, emissions and fuelconsumption. Under the hypothesis of a pilot-main injectionstrategy, a multi-objective optimization problem is solved throughthe employment of a genetic algorithm. Eight degrees of freedom aredefined, namely start of injection, dwell time, energizing time ofpilot and main pulses, EGR valve opening, throttle valve opening,swirl level, and turbine opening ratio. It is shown thatnon-negligible improvements can be gained, also depending on theimportance given to the various objectives

Notes:

Vendor supplied data

Publisher Number:

2011-24-0019

Access Restriction:

Restricted for use by site license