Closed loop combustion control with an in-cylinder pressure sensor is a nice-to-have technology for conventional spark ignited gasoline engines. For engines with Homogeneous Charge Compression Ignition (HCCI) it is a must. GM demonstrated this combustion process in two drivable concept vehicles equipped with in-cylinder pressure based controls. Transferring HCCI technology from single-cylinder steady-state engine operation in the laboratory to a modern passenger car had been a significant challenge. However, fast-transient HCCI operation has been demonstrated in prototype vehicles using a combination of variable valvetrain, central direct injection, cylinder-pressure sensing and cycle-to-cycle engine controls. The variable valve train is required to control the in-cylinder temperature with residual-gas. The direct injection of fuel is mandatory for this concept and allows the balancing of the cylinders and cycle-by-cycle multiple fuel injection quantity and timing control. Cylinder-pressure sensing with robust, closed-loop engine controls is necessary to keep the combustion phasing at its optimum efficiency by compensating the influences of different fuels, ambient conditions and other real world factors. The combustion induced noise can be assessed and optimized by calculating the ringing index from the cylinder pressure signal and using it as a criterion in the controls strategy. To enable the HCCI operation, engine hardware is chosen to keep todays benefits of a gasoline engine in cost, power and weight while improving fuel efficiency up to 15 %. GM will work on the remaining challenges to transfer the high thermodynamic potential of HCCI engines into everyday driving conditions.


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    Titel :

    Closed loop combustion control for HCCI


    Beteiligte:
    Grebe, Uwe Dieter (Autor:in) / Alt, Matthias (Autor:in) / Chang, Man-Feng (Autor:in)


    Erscheinungsdatum :

    2008


    Format / Umfang :

    18 Seiten, 16 Bilder, 9 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Datenträger


    Sprache :

    Englisch




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