An alternative exhaust manifold system, the Perforated Manifold, Muffler, and Catalyst (PMMC), is proposed to improve sound suppression while reducing engine pumping losses and exhaust emissions. One-dimensional predictions from acoustic theory are used to configure the initial design. Preliminary evaluation of the concept is based on bench tests, including an extended impedance tube set-up for acoustic attenuation and a flow bench for flow loss characteristics. Experiments with the fabricated hardware are then conducted in an engine dynamometer facility, and the results were compared to the existing production system as a benchmark. Engine experiments show that the PMMC concept provides enhanced upstream sound suppression, reducing the need for restrictive downstream silencers. This results in reduced engine pumping work and thus improved engine brake horsepower. Additionally, conservation of exhaust gas thermal energy and the reduced thermal inertia of the exhaust system provides earlier catalyst light-off, and therefore reduced pollutant emissions.


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    Titel :

    Perforated muffler manifold catalyst


    Weitere Titelangaben:

    Perforierte Abgassammelleitung, Abgasschalldämpfer, Abgaskatalysator


    Beteiligte:
    Norman, K.R. (Autor:in) / Selamet, A. (Autor:in) / Novak, J.M. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1998


    Format / Umfang :

    24 Seiten, 20 Bilder, 3 Tabellen, 19 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




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    Norman, K.R. | Online Contents


    Perforated muffler manifold catalyst

    Norman, K.R. | Online Contents | 1998


    Design of an Integral Perforated Manifold, Muffler, and Catalyst

    Selamet, Ahmet / Novak, James M. / Norman, Kristofor R. | SAE Technical Papers | 2001


    Design of an integral perforated manifold, muffler, and catalyst

    Norman,K.R. / Npvak,J.M. / Selamet,A. et al. | Kraftfahrwesen | 2001


    2001-01-0222 Design of an Integral Perforated Manifold, Muffler, and Catalyst

    Norman, K. R. / Novak, J. M. / Selamet, A. et al. | British Library Conference Proceedings | 2001