Dynamic Skip Fire (DSF®) has been shown to significantly reduce CO2 on gasoline engines and has been in mass production since 2018 with more than 1.5 million vehicles produced. DSF is an advanced cylinder deactivation technology which enables any number of cylinders to be fired and dynamically decides on a cylinder event basis. Noise, vibration, and harshness (NVH) is proactively mitigated by manipulating the firing pattern and cylinder loading to avoid vehicle resonances. The technology is implemented via modification of the engine valve train and controller software where Tula’s proprietary DSF algorithms dictate each combustion event.

    Diesel Dynamic Skip Fire (dDSF™) builds upon this technology and extends it to diesel engine applications. Meeting low NOX emission standards is becoming increasingly challenging, especially in lightly loaded operating conditions where maintaining ideal aftertreatment system efficiency is difficult. Most existing techniques to increase aftertreatment temperatures at low loads increase fuel consumption. Diesel applications with DSF benefit significantly from a simultaneous reduction in CO2 and NOX due to reduced heat transfer and pumping losses. The result is increased exhaust gas temperatures at low engine loads aiding emissions conversion, and a reduction in fuel spent on heating the aftertreatment system.

    In this paper, the combined benefits of dDSF are demonstrated with a Cummins HD diesel engine operating in an on-highway truck and a Liebherr HD diesel engine operating in various off-highway machine applications. For the Cummins application, results are shown for steady state engine testing, transient cycle simulation, and transient vehicle tests. NVH testing and evaluation was performed at the vehicle level to characterize vehicle response and ensure acceptance of this technology. Results show a 74% reduction of NOX and a 5.0% reduction in CO2 on the Low Load Cycle (LLC) compared to the baseline engine using conventional thermal management. For the Liebherr application, simulation results show a NOX reduction of 41% and a CO2 reduction of 9.5% over a mobile crane machine cycle.


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    Titel :

    Application of Dynamic Skip Fire for NOX and CO2 Emissions Reduction on a HD Diesel Truck and for an Off Highway Engine


    Weitere Titelangaben:

    Proceedings


    Beteiligte:
    Heintzel, Alexander (Herausgeber:in) / Wang, Robert (Autor:in) / Chen, Hao (Autor:in) / Srinivasan, Vijay (Autor:in) / Schiffgens, Hans-Josef (Autor:in) / Seba, Bouzid (Autor:in) / Jansen, Nicolas (Autor:in)

    Kongress:

    International ATZ Conference ; 2022 ; Wiesbaden, Deutschland April 05, 2022 - April 06, 2022


    Erschienen in:

    Erscheinungsdatum :

    2024-06-30


    Format / Umfang :

    24 pages





    Medientyp :

    Aufsatz/Kapitel (Buch)


    Format :

    Elektronische Ressource


    Sprache :

    Deutsch




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