A production heavy-duty (truck) gasoline engine was equiped with both TWC single-bed and TWC dual-bed catalysts as well as a closed-loop control, stoichiometric air/fuel ratio carburetor system. The exhaust HC, CO and NOx emissions were measured on the EPA heavy-duty transient test cycle (cold start) applicable for 1984 engines. Catalyst conversion efficiencies for HC, CO and Nox of 76 %, 94 % and 77 % were achieved with the dual-bed-system. Corresponding catalyst conversion efficiencies for the TWC single-bed catalyst system were 64 %, 56 % and 79 %. At low mileage, HC/CO/NOx emissions with the dual-bed system and EGR were 0.68/3.60/0.74 gm/BHP-hr which were well below the 1984-85 Federal limits of 1.3/15.5/1.7 gm/BHP-hr.No attempt was made to optimize the various components of the total system in this program. A loss of approximately 3 % in maximum horse-power was observed relative to standard production engine. Fuel economy was unaffected. Several undesirable design characteristics of the air/fuel mixture preparation and particularly mixture distribution for this engine were identified and suggestions are made to modify the air/fuel mixing and manifold to achieve the degree of control now attained in current high-duty (passenger car) engines. (Wassmann)


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    The application of the three way conversion catalyst system to a heavy-duty gasoline engine


    Additional title:

    Die Anwendung des Dreiwege-Umwandlungskatalysatorsystemes bei einem Schwerlast-Benzinmotor


    Contributors:
    Hansel, J.G. (author) / Cox, T.P. (author) / Nugent, T.J. (author)

    Published in:

    Publication date :

    1981


    Size :

    16 Seiten, 17 Bilder, 7 Tabellen, 32 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    The Application of a Three Way Conversion Catalyst System to a Heavy-Duty Gasoline Engine

    Hansel,J.G. / Cox,T.P. / Nugent,T.J. et al. | Automotive engineering | 1981


    THE APPLICATION OF A THREE WAY CONVERSION CATALYST SYSTEM TO A HEAVY-DUTY GASOLINE ENGINE

    Hansel, James G. / Nugent, Thomas J. / Cox, Timothy P. | SAE Technical Papers | 1981


    Application of heavy- duty- catalytic converters on medium and heavy- duty gasoline powered trucks.

    De Palma,T.V. / Bailey,C.H. / Universal Oil Products | Automotive engineering | 1975