Abstract A 1-D transient emission analysis was performed during the cold start period of the city driving 75 (CVS-75) mode for a liquefied petroleum gas (LPG) vehicle to identify the optimal operating conditions of a secondary air injection (SAI) system. A commercial 1-D program, AMESim, was used to model the full exhaust system, including the SAI system, as well as a manifold catalytic converter (MCC) and an under-body catalytic converter (UCC). Next, the effects of the SAI air flow rate and the supply time on HC, CO, and NO x emissions were analyzed using the simulation model with 7-step global surface chemical reactions of the Langmuir-Hinshelwood type. From the simulated results, we found that a 29% HC reduction and a 50% CO reduction can be achieved with the SAI system under the optimal operation conditions of 1.6 g/s of air flow rate for 30 s.


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    Title :

    1-D transient emission analysis of LPG engine catalytic converter with secondary air injection during cold start period of CVS-75 mode


    Contributors:
    Yun, J. E. (author)

    Published in:

    Publication date :

    2013-05-30


    Size :

    11 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English