Abstract In this paper, we investigate the transient characteristics of combustion and emissions during engine start/stop operations in hybrid electric vehicle (HEV) applications. Hydrocarbon (HC) emissions during the initial 2nd∼9th cycles are found to be significantly greater when the engine is quickly started under the original engine calibration mode. Lower intake manifold absolute pressure (MAP) was also found to cause larger residual gas dilution and poor combustion, resulting in a higher HC concentration when the cranking speed was increased. The post-catalyst HC concentration was found in the way of initially decrease and then to increase again as the cranking speed was increased. A lowest concentration value was achieved at a cranking speed of 1000 r/min. Engine shut-down by fuel cut-off was shown to produce lower emissions than shut-down by ignition cut-off as one can avoid misfire of the last fuel injection cycle. The fuel deposited during the stop process seems to impact engine restart enrichment mostly during the initial 0.7 s for this engine, whose performance is dominated by the MAP transition characteristic and the time coefficient for fuel vaporization in this time period


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Transient characteristics of emissions during engine start/stop operation employing a conventional gasoline engine for HEV application


    Contributors:
    Yu, S. (author) / Dong, G. (author) / LI, L. (author)

    Published in:

    Publication date :

    2008-10-01


    Size :

    7 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English






    Start Strategies for Stop/Start Operation of a Sl-Engine

    Beer, J. / Deiml, M. / Herfurth, R. et al. | British Library Conference Proceedings | 2005


    Engine start and stop system and engine start and stop control method

    WANG MINGMING / LIU XINBO / DONG YANWEN et al. | European Patent Office | 2015

    Free access