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.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Closed loop combustion control for HCCI


    Contributors:


    Publication date :

    2008


    Size :

    18 Seiten, 16 Bilder, 9 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




    Closed loop combustion control for HCCI

    Grebe,U.D. / Alt,M. / Dulzo,J. et al. | Automotive engineering | 2008


    HCCI Closed-Loop Combustion Control Using Fast Thermal Management

    Haraldsson, G. / Tunestal, P. / Johanssen, B. et al. | British Library Conference Proceedings | 2004


    HCCI closed-loop combustion control using fast thermal management

    Haraldsson,G. / Tunestal,P. / Johansson,B. et al. | Automotive engineering | 2004


    HCCI Closed-Loop Combustion Control Using Fast Thermal Management

    Johansson, Bengt / Haraldsson, Göran / Hyvönen, Jari et al. | SAE Technical Papers | 2004


    Actuator comparison for closed loop control of HCCI combustion timing

    Audet,A. / Koch,C.R. / Univ.of Alberta,CA | Automotive engineering | 2009