Recently conducted work has been funded by the California Air Resources Board (CARB) to explore the feasibility of achieving 0.02 g/bhp-hr NOX emissions for heavy-duty on-road engines. In addition to NOX emissions, greenhouse gas (GHG), CO2 and methane emissions regulations from heavy-duty engines are also becoming more stringent. To achieve low cold-start NOX and methane emissions, the exhaust aftertreatment must be brought up to temperature quickly while keeping proper air-fuel ratio control; however, a balance between catalyst light-off and fuel penalty must be addressed to meet future CO2 emissions regulations. This paper details the work executed to improve catalyst light-off for a natural gas engine with a close-coupled and an underfloor three-way-catalyst while meeting an FTP NOX emission target of 0.02 g/bhp-hr and minimizing any fuel penalty. Two methods for achieving fast catalyst light-off were examined: 1) secondary air injection upstream of the front face of the close-coupled catalyst, and 2) operating half of the cylinders rich and the other half of the cylinders lean. Results from this study demonstrate a potential pathway to achieving ultra-low NOX emissions and future GHG Phase 2 standards on heavy-duty vehicles.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Achieving Fast Catalyst Light-Off from a Heavy-Duty Stoichiometric Natural Gas Engine Capable of 0.02 g/bhp-hr NOX Emissions


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Sharp, Christopher (Autor:in) / Jimenez, Eugene (Autor:in) / Bartley, Gordon (Autor:in) / Smith, Ian (Autor:in) / Chiu, James (Autor:in) / Briggs, Thomas (Autor:in)

    Kongress:

    WCX World Congress Experience ; 2018



    Erscheinungsdatum :

    2018-04-03




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Achieving 0.02 g/bhp-hr NOx Emissions from a Heavy-Duty Stoichiometric Natural Gas Engine Equipped with Three-Way Catalyst

    Sharp, Christopher / Webb, Cynthia / Smith, Ian et al. | SAE Technical Papers | 2017


    Achieving 0.02 g/bhp-hr NO~x Emissions from a Heavy-Duty Stoichiometric Natural Gas Engine Equipped with Three-Way Catalyst

    Smith, Ian / Briggs, Thomas / Sharp, Christopher et al. | British Library Conference Proceedings | 2017


    US 2010 emissions capable camless heavy-duty on-highway natural gas engine

    Chiu,J.P. / Taylor,J.D. / Tai,C. et al. | Kraftfahrwesen | 2007


    US 2010 Emissions Capable Camless Heavy-Duty On-Highway Natural Gas Engine

    Tai, Chun / Chiu, James P. / Taylor, Joshua D. et al. | SAE Technical Papers | 2007


    Heavy-duty engine emissions

    Online Contents | 1995