The thermal conditions of an engine structure, in particular the wall temperatures, have been shown to have a great effect on the HCCI engine combustion timing and burn rates through wall heat transfer, especially during transient operations. This study addresses the effects of thermal inertia on combustion in an HCCI engine.In this study, the control of combustion timing in an HCCI engine is achieved by modulating the residual gas fraction (RGF) while considering the wall temperatures. A multi-cylinder engine simulation with detailed geometry is carried out using a 1-D system model (GT-Power®) that is linked with Simulink®. The model includes a finite element wall temperature solver and is enhanced with original HCCI combustion and heat transfer models. Initially, the required residual gas fraction for optimal BSFC is determined for steady-state operation. The model is then used to derive a map of the sensitivity of optimal residual gas fraction to wall temperature excursions. Finally, the model is used to determine the necessary changes in the control strategy to compensate for the thermal inertia effects during transients.The results show that, when the non-equilibrium transient wall temperature difference from the steady-state value is moderate, load and speed transitions in the HCCI operating regime can be managed by using controllers based on steady-state RGF maps. However, with large non-equilibrium transient wall temperature excursions from the steady-state, the results indicate the need for wall temperature dependent calibration of combustion parameters for best fuel economy and knock-free performance. Compensating for the wall temperature effects results in improved fuel economy while satisfying knock and misfire constraints.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Control of a Multi-Cylinder HCCI Engine During Transient Operation by Modulating Residual Gas Fraction to Compensate for Wall Temperature Effects


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    SAE World Congress & Exhibition ; 2007



    Erscheinungsdatum :

    2007-04-16




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





    Transient Control of a Multi Cylinder HCCI Engine During a Drive Cycle

    Johansson, Bengt / Haraldsson, Göran / Hyvönen, Jari et al. | SAE Technical Papers | 2005


    Transient control of a multi cylinder HCCI engine during a drive cycle

    Haraldsson,G / Tunestal,P. / Johansson,B. et al. | Kraftfahrwesen | 2005


    HCCI operation control on a multi-cylinder gasoline engine

    Yamaoka,S. / Kakuya,H. / Nakagawa,S. et al. | Kraftfahrwesen | 2005


    HCCI Operation Control in a Multi-Cylinder Gasoline Engine

    Shimada, Atsushi / Kakuya, Hiromu / Nakagawa, Shinji et al. | SAE Technical Papers | 2005