One of the most significant current discussions worldwide is the anthropogenic climate change accompanying fossil fuel consumption. Sustainable development in all fields of combustion engines is required with the principal objective to enhance efficiency. This certainly concerns the field of hand-held power tools as well. Today, two-stroke SI engines equipped with a carburetor are the most widely used propulsion technology in hand-held power tools like chain saws and grass trimmers.To date, research tended to focus on two-stroke engines with rich mixture setting. In this paper the advantages and challenges of leaner and/or lean operation are discussed. Experimental investigations regarding the influence of equivalence ratio on emissions, fuel consumption and power have been performed. Accompanying 3D-CFD simulations support the experiments in order to gain insight into these complex processes. The investigations concentrate on two different mixture formation processes, i.e. CCI (crankcase injection) and LPDI (low pressure direct injection). Further focus is put onto combustion phenomena of lean mixtures. The main issue addressed in this paper is the impact of mixture setting on fuel consumption. Therefore, the losses from theoretical to effective efficiency of different settings calculated by thermodynamic analyses are explained. Savings potential of fuel consumption and HC emissions are demonstrated.The results indicate that fulfillment of required durability and power density using a leaner mixture setting is a significant challenge. Furthermore, the increase of NOx emissions is a fundamental drawback. Here, basic research regarding reduction of NOx engine-out emissions is required.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Advantages and Challenges of Lean Operation of Two-Stroke Engines for Hand-Held Power Tools


    Weitere Titelangaben:

    Sae Int. J. Engines


    Beteiligte:

    Kongress:

    SAE/JSAE 2014 Small Engine Technology Conference & Exhibition ; 2014


    Erschienen in:

    Erscheinungsdatum :

    11.11.2014


    Format / Umfang :

    19 pages




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Advantages and challenges of lean operation of two-stroke engines for hand-held power tools

    Meyer, Stephan / Kölmel, Armin / Gegg, Tim et al. | Springer Verlag | 2015


    Advantages and challenges of lean operation of two-stroke engines for hand-held power tools

    Meyer,S. / Koelmel,A. / Gegg,T. et al. | Kraftfahrwesen | 2015


    Potential of fuel injection in two-stroke engines for hand-held power tools

    Kölmel, Armin / Gegg, T. / Meyer, S. et al. | Springer Verlag | 2014


    Potential of fuel injection on two-stroke engines for hand-held power tools

    Koelmel,A. / Gegg,T. / Meyer,S. et al. | Kraftfahrwesen | 2014


    A New High-Performance Four-Stroke Engine for All-Position Use in Hand-Held Power Tools

    Knaus, K. / Haberlein, J. / Becker, G. et al. | British Library Conference Proceedings | 2004