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Diesel injector dynamic modelling and estimation of injection parameters from impact response Part 1: modelling and analysis of injector impacts

Gu, Fengshou and Ball, Andrew (1996) Diesel injector dynamic modelling and estimation of injection parameters from impact response Part 1: modelling and analysis of injector impacts. Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering, 210 (44). pp. 293-302. ISSN 0954-4070

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    Abstract

    Part 1 of this paper presents the development and validation of a detailed dynamic model for the needle motion of a common hole‐type diesel fuel injector as used in a direct injection diesel engine. The injector needle motion is described as a two‐mass piece‐wise linear vibro‐impact system, unlike the conventional modelling techniques which use a single‐mass approach. The use of two masses permits analysis of both the needle impact behaviour and of the more general dynamics of the fuel injection process.

    Model parameters are derived from a combination of measurement and estimation, and the subsequent model is evaluated via direct measurement of the spring seat displacement. The opening and closing needle impact behaviour is shown to exhibit close correlation with key injection parameters, including fuel injection pressure, fuelling rate and timing.

    The model revealed that the impact of the needle when opening is found to exhibit lower amplitude but more high‐frequency components than the impact associated with the closing. The measurement of the injector body vibration response to these impacts is shown to enable non‐intrusive estimation of injection parameters, alleviating the problems associated with conventional intrusive needle‐lift measurement.

    Table 1 caption: Injector specifications

    Fig. 1 caption: Schematic and dynamic model of an injector valve

    Fig. 2 caption: Comparison between measurement and predicted needle lift

    Fig. 3 caption: Injection speed behaviours at a fuelling of 35 mm3/injection

    Fig. 4 caption: Injection fuel behaviours at a speed of setting 1.0 m/s

    Fig. 5 caption: Impact/speed correlation at a fuelling of 35 mm3/injection

    Fig. 6 caption: Time‐frequency analysis of injector impacts

    Fig. 7 caption: Correlation between fuel injection parameters and impacts

    Fig. 8 caption: Influence of needle mass on fuel injection

    Item Type: Article
    Subjects: T Technology > T Technology (General)
    T Technology > TL Motor vehicles. Aeronautics. Astronautics
    Schools: School of Computing and Engineering
    School of Computing and Engineering > Automotive Engineering Research Group
    School of Computing and Engineering > Diagnostic Engineering Research Centre
    School of Computing and Engineering > Diagnostic Engineering Research Centre > Energy, Emissions and the Environment Research Group
    School of Computing and Engineering > Diagnostic Engineering Research Centre > Machinery Condition and Performance Monitoring Research Group
    School of Computing and Engineering > Diagnostic Engineering Research Centre > Measurement System and Signal Processing Research Group
    School of Computing and Engineering > Informatics Research Group
    School of Computing and Engineering > Informatics Research Group > XML, Database and Information Retrieval Research Group
    Related URLs:
    Depositing User: Sharon Beastall
    Date Deposited: 20 Jan 2010 09:33
    Last Modified: 08 Dec 2010 13:39
    URI: http://eprints.hud.ac.uk/id/eprint/6786

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