Hybrid pneumatic engines, which are designed to follow the downsizing and supercharging paradigm, offer a fuel-saving potential that is almost equal to that of hybrid electric powertrains while inducing much lower additional mass and cost penalties. This paper presents a systematic optimization of the operation of such an engine system. Both two-stroke and four-stroke modes are analysed. The optimized valve and throttle actuation laws for all modes and operating areas lead to generic maps that are independent of the engine size. So far, the pneumatic hybridization of internal combustion engines was thought to require two-stroke operation. This paper presents a novel hybrid pneumatic engine configuration that entails fixed camshafts for both intake and exhaust valves while utilizing variable valve actuation for one charge valve per cylinder only. This configuration is operated entirely in four-stroke modes. Such a configuration requires a careful optimization of its operating strategy to achieve its fuel economy potential. Compared with a full two-stroke operation, only small efficiency losses result from using four-stroke modes with these new operating strategies. Initial measurement results with such an engine system are presented in this paper to confirm the validity of the principles of operation.


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    Titel :

    Modelling and optimizing two- and four-stroke hybrid pneumatic engines


    Beteiligte:
    Dönitz, C. (Autor:in) / Vasile, I. (Autor:in) / Onder, C.H. (Autor:in) / Guzzella, L. (Autor:in)


    Erscheinungsdatum :

    2009


    Format / Umfang :

    26 Seiten, 14 Bilder, 2 Tabellen, 14 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Modelling and optimizing two-stroke and four-stroke hybrid pneumatic engines

    Doenitz,C. / Vasile,I. / Onder,C.H. et al. | Kraftfahrwesen | 2009


    Modelling and optimizing two- and four-stroke hybrid pneumatic engines

    Dönitz, C / Vasile, I / Onder, C H et al. | SAGE Publications | 2009



    German four-stroke oil engines

    Georg Mangold | Engineering Index Backfile | 1925


    Sulzer four-stroke diesel engines

    Bruehlmann, H. | Tema Archiv | 1976