This paper reports about status and ongoing activities in gas injection systems aiming towards DI (direct injection) of hydrogen. Gas injection requires different components compared to liquid injection systems, regarding combustion process and fluid properties. Additionally to gas operation most customers demand a bi-fuel option. Bi-fuel systems require expanded functionalities in the engine control unit (ECU) namely for driving two injection systems and switching from one to another. Key components are injectors for gas port injection and direct injection. Currently bi-fuel systems for port injection of compressed natural gas (CNG) and liquefied petroleum gas (LPG) are commercially available. As a powerful and linear drive, piezo-actuators, known from common rail diesel and recently gasoline-DI are state of the art. Direct injection of CNG can be used as a platform technology for hydrogen-DI. Gaseous fuels will play an important role in the future of automotive engines. In present the number of CNG cars is steadily increasing and already noticeable with e.g. 400.000 cars in Italy and more than 600 filling stations in Germany. With its almost ideal properties hydrogen powered engines will be a logic following step. As the supply infrastructure for gases is less complete than for gasoline and diesel especially when travelling in different countries a gas car must have a bi-fuel option to be commercially successful. Siemens is a supplier of motor electronics and fuel supply systems for liquid and bi-fuel operation (gasoline-CNG/LPG) and constantly improving and innovating components. To improve performance and emissions DI injection technology is a very challenging but necessary step. The extremely high volume flow in CNG-DI could be achieved already in a prototype showing the feasibility of the concept with a piezo actuator and hydraulic stroke transformation. The development of a H2 injector is even more challenging regarding the possible operating conditions described. Therefore a H2 injector will be developed in steps using the experience of liquid fuel injection and CNG-injection.


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    Title :

    Key components for gaseous fluids from actual demands to future concepts


    Additional title:

    Schlüsselkomponenten für gasförmige Medien von aktuellen Anforderungen zu künftigen Konzepten


    Contributors:
    Lugert, G. (author) / Koch, A. (author) / Bachmaier, G. (author) / Eisen, S. (author) / Magori, E. (author)


    Publication date :

    2006


    Size :

    6 Seiten, 4 Bilder, 3 Tabellen, 4 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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