The LCE (Linear Combustion Engine) is special type of combustion engine. It represents a new approach to chemical energy of hydrocarbon to electric energy conversion. This non-conventional system has great potential especially in area of HEV (Hybrid Electric Vehicles). As today's keywords are efficiency and environment protection, the HEV's are expected to be the 'cars of the future'. The LCE is two-stroke, two-cylinder combustion engine. Unlike conventional ones, there is no crankshaft. The LCE moving part consist of two rod connected pistons only and the electric energy is generated directly from the linear movement by a linear motor-generator. The absence of crankshaft brings many advantages such as: simple mechanical design, high specific power, higher lifetime. On the other hand, a collision between piston and cylinder head threatens. It is because there is no crankshaft representing limits of pistons movement. Therefore, the piston movement must be an object of control. Before looking for suitable control algorithm the behavior of LCE system must be studied. In order to do so a model was built. The created model consists of four submodels describing separable phenomena. First of them is submodel of mechanical system describing the dependencies of applied forces to position of the connecting rod. This submodel employs simple model of friction. The second submodel deals with linear motor-generator, motor-generator driver (a IGBT (Insulated Gate Bipolar Transistor) full-bridge) and voltage-current conversion loop. The reason demanding this loop is fact that force is proportional to the current flow through the winding. Also electric power delivered to/by LCE is computed. The third submodel describes the behavior of in-cylinders gasses during engine cycle. It is based on first thermodynamical law and gas state equation. The exchange of in-cylinder contens is also taken in to account. This submodel is strongly non-linear. The fourth model deals with production of thermal energy during the burning of mixture. It is assumed that the flame face is spherically shaped. This submodel is able to operate with both constant or pressure-dependent velocity of flame propagation. All the mentioned models are encapsulated to the global model of LCE. Many simulations was performed on the model described. The values of observed model variables are similar to the values taken on real piston engines. All on model gathered information are utilized during the controller development. In this time a real model of LCE is under development.


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    Titel :

    Linear combustion engine - the model


    Weitere Titelangaben:

    Kurbelwellenloser Verbrennungsmotor - Das Simulationsmodell


    Beteiligte:
    Sindelka, M. (Autor:in) / Vysoky, O. (Autor:in)


    Erscheinungsdatum :

    2001


    Format / Umfang :

    4 Seiten, 7 Bilder, 8 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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