Use of dilution with exhaust gas recirculation (EGR) offers substantial efficiency gains in spark ignition (SI) engines, especially when boosting and downsizing are employed. However, the onset of instabilities in engine operation, due to misfires and partial burns, limits the dilution levels. Active controls can be employed to improve engine stability during high dilution operation, with spark and fueling being the main control parameters available for cycle-to-cycle control implementation. This paper aims to understand the sensitivity of the combustion process to changes in fueling under dilute operation achieved with both excess air (lean operation) and EGR. Sinusoidal perturbations were introduced into the injected fuel quantity, and the sensitivity to these perturbations was characterized using a fast Fourier transform (FFT) analysis of the cycle cumulative heat release data. Furthermore, the minimum fueling change required to produce a measurable effect on engine operation was quantified at various levels of dilution. For fixed spark timing (similar ignition conditions), sensitivity to fuel perturbation increases nearly exponentially as EGR dilution is increased, due to the highly nonlinear relationship between combustion quality and in-cylinder charge properties at the dilution limit. However, when spark timing is advanced to compensate for the lower flame speeds of dilute combustion and maintain constant combustion phasing, this effect is suppressed and there is an initial decrease in sensitivity to fuel perturbations as EGR is increased, until the dilute limit is reached, at which point sensitivity again increases. For lean operation, response to very small perturbations was detected at all dilution levels.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Determination of SI Combustion Sensitivity to Fuel Perturbations as a Cyclic Control Input for Highly Dilute Operation


    Weitere Titelangaben:

    Sae Int. J. Engines


    Beteiligte:

    Kongress:

    WCX™ 17: SAE World Congress Experience ; 2017


    Erschienen in:

    Erscheinungsdatum :

    2017-03-28


    Format / Umfang :

    8 pages




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Multiple-Event Fuel Injection Investigations in a Highly-Dilute Diesel Low Temperature Combustion Regime

    Koci, Chad P. / Foster, David E. / Andrie, Mike et al. | SAE Technical Papers | 2009



    Dilute Combustion Control Using Spiking Neural Networks

    Kaul, Brian C. / Maldonado, Bryan P. / Schuman, Catherine D. et al. | SAE Technical Papers | 2021


    OPERATION INPUT SYSTEM, OPERATION INPUT CONTROL METHOD, AND OPERATION INPUT CONTROL PROGRAM

    HARIGAI MASATO | Europäisches Patentamt | 2019

    Freier Zugriff

    A hybrid 2-zone/WAVW engine combustion model for simulating combustion instabilities during dilute operation

    Edwards,K.D. / Wagner,R.M. / Chakravarthy,V.K. et al. | Kraftfahrwesen | 2005