In-cylinder visualization of the entire bore area at an identical frame rate was used to investigate knocking conditions under spark ignition (SI) combustion and under Homogeneous Charge Compression Ignition (HCCI) combustion in the same test engine. A frequency analysis was also conducted on the measured pressure signals. The results revealed that a combustion regime accompanied by strong pressure oscillations occurred in both the SI and HCCI modes, which was presumably caused by rapid autoignition with attendant brilliant light emission that took place near the cylinder wall. It was found that the knocking timing was the dominant factor of this combustion regime accompanied by cylinder pressure oscillations in both the SI and HCCI combustion modes.


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    Title :

    A Study on the Knocking Characteristics of an SI-HCCI Engine by Using In-Cylinder Visualization


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE/JSAE 2016 Small Engine Technology Conference & Exhibition ; 2016



    Publication date :

    2016-11-08




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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