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EFFICIENT OPTIMIZATION OF HEAVY-DUTY DIESEL COMPLYING WITH EMISSION STANDARDS

Objectif

(A) ECONOMIC BENEFITS -
- GENERATION OF REFERENCE DATA TO CONFIRM THE MULTI-DIMENSIONAL MODELS BEING DEVELOPED (IN PARTICULAR THE JRC PROGRAMME MODELS);
- INITIAL VERIFICATION OF THE POSSIBILITY OF PROVIDING THE ACTUAL COMBUSTION PROCESS WITH A SUBMODEL WITH SIMPLIFIED CHEMICAL KINETICS IN SOPHISTICATED JRC MODELS OF AIR MOTION AND SPRAY FORMATION WHICH WILL BE COMPLETED OVER THE 3 YEAR PERIOD 1986-88.

(B) TECHNICAL BENEFITS:
- DEFINITION OF AN INNOVATIVE COMBUSTION SYSTEM FOR DIRECT INJECTION DIESEL ENGINES CAPABLE OF REDUCING FUEL CONSUMPTION AND POLLUTION IN THE LONG TERM.

(C) ECONOMIC BENEFITS
- SUBSTANTIAL REDUCTION IN FUEL CONSUMPTION AND EMISSION FROM HEAVY-DUTY DIESEL ENGINES BUILT IN EUROPE.
Detailed spatial and temporal information on the variables affecting combustion development inside a cylinder were obtained by both computer simulation and laboratory measurements. The results of the basic research work was adopted in the development of a multicylinder engine prototype. Better and more complete combustion was achieved by optimising the air fuel mixture in the combustion chamber to obtain lower maximum temperatures and better utilisation of the air trapped in the cylinder. Extensive applications of existing and improved mathematical models have been made. In particular, the basic code used was the 3-dimensional KIVA, originating in Los Alamos. A wide range of experimental conditions and parameter variations were studied both on a single cylinder engine, which was devoted to flame propagation studies, and on a real truck engine. The experimental work was guided by the predictions of the mathematical models.

A prototype of a highly advanced heavy duty diesel engine with increased thermal efficiency, a 30% lower emmission standard against foreseen future regulations, and the capability to operate efficiently, even with future lower quality fuels has been developed.

The targets of the engine optimisation were compliance with emission standards of R49-30%, and a thermal efficiency of 0.44. The concept was based on a better and more complete combustion to be promoted by a highly improved air fuel mixture in the combustion chamber. This would allow low maximum temperatures and better utilisation of the incylinder trapped air to be achieved.

The wide parametic experimentation both on single cylinder engines (devoted to flame propagation studies) and on real truck engines, involved several experimental conditions for a variety of parameters. The experimental work was guided by the trends derived from the application of mathematical models.
THE DEVELOPMENT OF MULTI-DIMENSIONAL MODELS IS A BASIC REQUIREMENT FOR ACHIEVING EFFICIENT COMBUSTION SYSTEMS. IN THE PAST 2-D MODELS HAVE BEEN DEVELOPED AT IMPERIAL COLLEGE, AND MORE RECENTLY THE JRC HAS DEVELOPED A 3-D MODEL OF AIR MOTION. FURTHER PROGRESS IS EXPECTED OVER THE NEXT 3 YEARS, NOT ONLY FOR AIR MOTION BUT ALSO FOR SPRAY FORMATION. NEVERTHELESS, NO ACTION HAS SO FAR BEEN UNDERTAKEN TO USE THESE MODELS IN DEVELOPING A COMBUSTION SYSTEM FOR DIRECT INJECTION DIESEL ENGINES WITH HIGH OUTPUT AND LOW EMISSIONS. THROUGH ADAPTING THESE MULTI-DIMENSIONAL MODELS TO THE SYSTEMS OF COMBUSTION AS SUCH, THE AIM NOW IS TO DEFINE A NEW SYSTEM OF DIESEL COMBUSTION BASED ON A BETTER MIX OF AIR AND FUEL AS TO OBTAIN HIGH EFFICIENCY COMBINED WITH LOW EMISSION.

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Coordinateur

Iveco Fiat SpA
Contribution de l’UE
Aucune donnée
Adresse
Strada delle Cascinette 6
10156 Torino
Italie

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