A Free-Piston Linear Generator (FPLG) is being dveloped at the German Aerospace Center (Deutsches Zentrum fuer Luft- und Raumfahrt, DLR). The FPLG can convert chemical energy of a fuel into electrical energy efficiently. Therefore, it can be used as a range-extending device in electric vehicles. The FPLG consists of three main subsystems: (1) An Internal Combustion Engine converting chemical energy into kinetic energy (ICE). (2) A Linear Generator converting kinetic energy into electric energy (LG). (3) A Gas Spring storing energy and inverting the piston movement (GS). The piston of the internal combustion engine, the generator rotor and the piston of the gas spring are rigidly coupled and perform a transversal oscillation between bottom dead center and top dead center. Compared to conventional combustion engines this engine concept leads to fully flexible operating parameters such as variable stroke and variable compression ratio. Moreover, the trajectory of the piston motion is variable and in general different from the kinematically determined trajectory of a crank drive. This paper presents the development methodology of the Free-Piston Linear Generator (FPLG). The FPLG is a free-piston combustion engine with an integrated linear generator. The engine can be used as a range-extending device in an electric vehicle. A systematic development approach for the FPLG is presented consisting of three basic steps. The fully variable experimental apparatus being used for testing the single FPLG-subsystems and the FPLG-system is described. In order to achieve robust operation of the FPLG-system during experimental testing, a hydraulic actuator is implemented to simulate the motion of the free piston. Despite the use of such an hydraulic actuator, it is shown, that the system can be run in a quasi-autarkic operating mode. Experimental results using this quasi-autarkic operating mode are presented. Based on the results obtained, the further development of the FPLG towards a fully-autarkic operating mode without a hydraulic actuator can be tackled.


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    Titel :

    Development of a free-piston linear generator for use in an extended-range electric vehicle


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    2012


    Format / Umfang :

    5 Seiten, 6 Bilder, 3 Tabellen, 8 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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