It is well known that engine downsizing is still the main energy-saving technology for spark-ignition direct-injection (SIDI) engine. However, with the continuous increase of the boosting ratio, the gasoline engine is often accompanied by the occurrence of knocking, which has the drawback to run the engine at retarded combustion phasing. Besides, in order to protect the turbine blades from being sintered by high exhaust temperature, the strategies of fuel enrichment are often taken to reduce the combustion temperature, which ultimately leads to a high level of particulate number emission. Therefore, to address the issues discussed above, the port water injection (PWI) techniques on a 1.2-L turbocharged, three-cylinder, SIDI engine were investigated.Measurements indicate that the optimization of spark timing has a significant impact on its performance. The two factors of the water substance itself and spark advance caused by the knock mitigation are trade-offs, which eventually affect the combustion performance. Under knock limited spark advance (KLSA) condition, we find that the application of port water injection could effectively advance the combustion phasing and reduce exhaust gas temperature, which makes it possible to eliminate fuel enrichment and further enhances the fuel economy improvement at the maximum power point. As a result, about 5.2%-18.4% improvements in the fuel economy are obtained under different engine operating conditions.For the exhaust emissions, due to the increasing heat capacity of the mixture and the elimination of fuel enrichment, port water injection techniques cause an 85.3% reduction in particle number concentration. However, it shows that for a given λ, an increase in the water/fuel ratio would cause higher THC emissions, which is contributed to the occurrence of more quenching caused by higher peak combustion pressure. Finally, the potential of PWI on the engine combustion characteristics and emissions performance was revealed.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Influence of Port Water Injection on the Combustion Characteristics and Exhaust Emissions in a Spark-Ignition Direct-Injection Engine


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Hung, David (Autor:in) / Xu, Min (Autor:in) / Wu, Tianbao (Autor:in) / Li, Xuesong (Autor:in) / Fan, Yadong (Autor:in)

    Kongress:

    WCX SAE World Congress Experience ; 2020



    Erscheinungsdatum :

    2020-04-14




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Exhaust particulate emissions from a direct injection spark ignition engine

    Graskow,B.R. / Kittelson,D.B. / Ahmadi,M.R. et al. | Kraftfahrwesen | 1999


    Exhaust Particulate Emissions from a Direct Injection Spark Ignition Engine

    Graskow, B. R. / Kittelson, D. B. / Morris, J. E. et al. | SAE Technical Papers | 1999


    Exhaust Particulate Emissions from a Direct Injection Spark Ignition Engine

    Graskow, B. R. / Kittelson, D. B. / Ahmadi, M. R. et al. | British Library Conference Proceedings | 1999


    Particulate Emissions from a Direct-Injection Spark-Ignition Engine

    Cromas, J. / Ghandhi, J. B. | SAE Technical Papers | 2005


    Influence of Fuel Volatility on Emissions and Combustion in a Direct Injection Spark Ignition Engine

    Sandquist, Håkan / Denbratt, Ingemar / Olsson, Jim et al. | SAE Technical Papers | 1998