(continued from Page 1-12) The effect of fuel anti-knock quality on power and acceleration performance is studied in twenty-three European and Japanese cars equipped with knock sensors. The anti-knock quality of a fuel in a given car and operating condition is defined by its octane index OI = RON - KS where K is a constant for that condition and S is the sensitivity, (RON - MON), and RON and MON are the Research and Motor octane numbers respectively. The higher the octane index, the better the anti-knock quality of the fuel and the better the power and acceleration performance. K is often assumed to be 0.5 so that OI = (RON + MON) / 2. However, it is found that in most cases considered here, K is negative so that for a given RON, a fuel with higher sensitivity (lower MON) has better anti-knock quality and better performance. Even when K is not negative it has a small (< 0.2) positive value so that MON contributes much less to fuel anti-knock quality than generally assumed.


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    Title :

    Fuel anti-knock quality - Part II. vehicle studies - how relevant is motor octane number (MON) in modern engines?


    Contributors:


    Publication date :

    2002


    Size :

    11 Seiten, 7 Bilder, 8 Tabellen, 8 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English






    Four-Octane-Number Method for Predicting the Anti-Knock Behavior of Fuels und Engines

    Douaud,A.M. / Eyzat,P. / Inst.Fr.du Pet.,FR | Automotive engineering | 1978



    Fuel Anti-Knock Quality - Part I. Engine Studies

    Kalghatgi, G.T. | SAE Technical Papers | 2001