During the internal combustion engine operation some faults in the combustion process can occur, affecting the overall engine performance. Since the engine can be regarded as a periodic excitation source, a processing technique formulated in frequency domain is suggested. In this paper, a diagnosis methodology based on the analysis of the experimental exhaust pressure signal is presented. The technique is based on the data processing in both time and frequency domains and on the evaluation of the mean frequency-time history of the pressure trace, that, together with a trigger signal, allows to reveal the time-step in which the irregular combustion appeared and from it to identify the related cylinder. At first the developed procedure has been applied to investigate the behaviour of an automotive engine in regular conditions. Then the fault phenomenon has been produced by causing an interruption in the electric signal supplied to the spark of one cylinder. All presented results refer to a fixed value of engine speed, but different loads have been considered (100 %, 85 %, 70 % and 50 %), aimed at demonstrating the capability of the procedure to detect the malfunction presence for different engine loads conditions. Engine speed mainly contributes to the time existing between subsequent picks in the exhaust pressure histories, then it is not a critical parameter for the time-frequency processing technique. Load value affects the thermodynamic quantity values inside the cylinders, and then it is responsible for the amplitude of the pressure perturbations inside the exhaust system. From these considerations, the choice of investigating the load effect has arisen, aimed at demonstrating the applicability of the developed procedure for any amplitude of the pressure disturb, even when the fluctuations due to the regular running are characterized by reduced intensity. The results highlight the potentiality of the presented technique as diagnosis device able to detect malfunction phenomenon. In future, a possible development of the time-frequency technique could be oriented towards the use of more robust pressure trensducer.


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    Title :

    Exhaust pressure signal for automotive engines diagnosis


    Additional title:

    Abgasdrucksignal zur Motordiagnose


    Contributors:
    Chiavola, O. (author) / Conforto, S. (author)


    Publication date :

    2001


    Size :

    8 Seiten, 24 Bilder, 1 Tabelle, 7 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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