Fluctuations in the operational output of spark ignition engines are observed from one engine cycle to the other, when an engine is run at technically identical operating condition. These fluctuations known as cycle-to-cycle variations, when high, adversely affect the performance of an engine. Reduction in cycle-to-cycle variation in engines has been noted by researchers as one of the methods of improving engine efficiency and operational stability. This study investigated the combustion performance characteristics of two fuels: E5 (95% gasoline and 5% ethanol) and ULG98 (unleaded gasoline) in a spark ignition engine, operating at varying inlet pressure conditions and ignition timing. A two-stroke, 80mm bore, spark ignition engine was operated at an engine speed of 750 rpm, inlet pressures of 1.6 and 2.0 bar and spark-timings ranging from 2 to 13 bTDC. A top cylinder head with a centralized spark plug was used in all the experiments. The Gross Indicated Mean Effective Pressure (GIMEP), GIMEP’s coefficient of variance (COV) and the Mass Fraction Burned (MFB) were determined. An increase in the intake pressure of the engine gave rise to an increase in the engine’s GIMEP in all the fuels tested. While a decrease in the COV of the engine’s GIMEP with an increase in the engine’s intake pressure was observed, its effect on the crank angle of occurrence of MFB varied for E5 and ULG 98 fuels. The study established that reduction in the cycle-to-cycle variation in spark ignition engines can be achieved by supercharging or turbo-charging these engines.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Effect of Supercharging on Cycle-To-Cycle Variation in a Two-Stroke Spark Ignition Engine


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE 2016 World Congress and Exhibition ; 2016



    Publication date :

    2016-04-05




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Torque Boosting of 4-Stroke Cycle Spark-Ignition Engines by Crankcase-Supercharging

    Watanabe, Eiichi / Fukutani, Itaru / Okanishi, Naoki | SAE Technical Papers | 1990


    Torque boosting of 4-stroke cycle spark-ignition engines by crankcase-supercharging

    Okanishi,N. / Fukutani,I. / Watanabe,E. et al. | Automotive engineering | 1990


    Application of crankcase-supercharging to a 4-stroke cycle compression ignition engine

    Okanishi,N. / Fukutani,I. / Univ.of Industrial Technology,JP | Automotive engineering | 1994


    Application of Crankcase-Supercharging to a 4-Stroke Cycle Compression Ignition Engine

    Fukutani, Itaru / Okanishi, Naoki | SAE Technical Papers | 1994