Abstract Engine manufacturers have to face stringent emission regulations worldwide while maintaining performance and drivability targets as high as possible. However, some strong paradigm shifts are still necessary to further improve the typical trade-off between fuel consumption and tailpipe emissions of Diesel engines. Split-of-losses analyses have shown that improvements in fuel efficiency could be obtained by optimizing the combustion timing and duration. More generally, this article aims at showing that a fully optimized heat release rate could help in increasing the efficiency while complying with NOx, noise and peak firing pressure constraints. The reference engine for this study is a 2.3L Euro-6 compliant engine used for light commercial vehicles and passenger cars. First, experimental heat release rates have been modeled for different operating points by spline functions using a reduced number of relevant parameters. Then, based on these parameters, numerous heat release rates have been defined thanks to a design of experiments approach. Engine performance such as fuel consumption, noise, NOx emissions and peak firing pressure have then been quantified on a 0D single cylinder engine simulation platform. To do so, a new two-zones combustion model has been developed, allowing the user to specify the heat release rate due to combustion while quantifying the NOx emissions. All these steps define a complete workflow which allows the optimization of the heat release rate in different operating conditions. Thanks to this approach, it has been shown that the fuel consumption could be reduced by 5.5% at 3000 rpm full load and by 2% at 2000 rpm middle load. Finally, these works do not only confirm that the NOx emissions and noise can be lowered by controlling the very beginning of combustion, but they also show that the fuel consumption strongly depends on the duration of the second half of combustion.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Optimized heat release rate for enhanced thermal efficiency under NOx, noise and peak firing pressure constraints in light-duty Diesel engines


    Beteiligte:


    Erscheinungsdatum :

    2017-01-01


    Format / Umfang :

    18 pages





    Medientyp :

    Aufsatz/Kapitel (Buch)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch






    Enhancing Peak Firing Pressure Limit for Achieving Better Brake Thermal Efficiency of a Diesel Engine

    Enya, Kenji / Uchida, Noboru | British Library Conference Proceedings | 2019


    Prediction of In-Cylinder Pressure for Light-Duty Diesel Engines

    Han, Kyoungchan / Min, Kyoungdoug / Lee, Seungha et al. | SAE Technical Papers | 2019


    Idle noise reduction of light, medium and heavy duty diesel engines

    Searth, Philip / Ortiz, Diego | Tema Archiv | 2004