Diagnostics and identification of injection duration of common rail diesel injectors

Tomi R. Krogerus, Kalevi J. Huhtala

    Research output: Contribution to journalArticleScientificpeer-review

    3 Citations (Scopus)


    In this paper, we study the diagnostics and iden-
    tification of injection duration of common rail (CR) diesel
    pilot injectors of dual-fuel engines. In these pilot injec-
    tors, the injected volume is small and the repeatability of
    the injections and identification of the drifts of the injec-
    tors are important factors, which need to be taken into ac-
    count in achieving good repeatability (shot-to-shot with
    every cylinder) and therefore a well-balanced engine and
    reduced overall wear. A diagnostics method based on anal-
    ysis of CR pressure signal with experimental verification
    results is presented. Using the developed method, the rel-
    ative duration of injection events can be identified. In the
    method, the pressure signal during the injection is first ex-
    tracted after the control of each injection event. After that,
    the signal is normalized and filtered. Then a derivative of
    the filtered signal is calculated. Change in the derivative
    of the filtered signal larger than a predefined threshold
    indicates an injection event which can be detected and
    its relative duration can be identified. The efficacy of the
    proposed diagnostics method is presented with the exper-
    imental results, which show that the developed method
    detects drifts in injection duration and the magnitude of
    drift. According to the result, ≥ 10 µs change (2%, 500 µs)
    in injection time can be identified.
    Original languageEnglish
    Pages (from-to)1-6
    Issue number1
    Publication statusPublished - 24 Feb 2018
    Publication typeA1 Journal article-refereed


    • diagnostics
    • dual-fuel engine
    • common rail
    • injector
    • rail pressure

    Publication forum classification

    • Publication forum level 1


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