A promising approach for the variable valve actuation in spark ignition engines is based on electromagnetic actuators for the valve drive. The movement of the armature results from two opposite electromagnetic drives, supported by two springs. Without proper control of the current through the coils during flight time, the armature will hit the opposite position at high velocity, thus producing acoustical noise and reducing the lifetime of the actuator. This paper presents a new concept to achieve a soft landing with velocities in the range of 0.1 m/s. The applied control circuit requires no additional sensor for the valve position or speed and is only based on the observation of the electrical coil signals. Together with the optimized control strategy, the system complexity is minimized, which results into substantial cost savings. The complete system for a 4 cylinder / 16 valve engine has been tested under laboratory conditions and on a combustion test engine and has demonstrated its high robustness against variations of cylinder pressure and supply voltage.


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    Titel :

    Sensorless Control of Electromagnetic Actuators for Variable Valve Train


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Koch, A. (Autor:in) / Melbert, J. (Autor:in) / Butzmann, S. (Autor:in)

    Kongress:

    SAE 2000 World Congress ; 2000



    Erscheinungsdatum :

    2000-03-06




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


    Sensorless control of electromagnetic actuators for variable valve train

    Butzmann,S. / Melbert,J. / Koch,A. et al. | Kraftfahrwesen | 2000


    Transients of electromagnetic valve train ( EMVT ) actuators

    Hartwig,C. / Josef,O. / Gebauer,K. et al. | Kraftfahrwesen | 2004


    Transients of Electromagnetic Valve Train (EMVT) Actuators

    Hartwig, Christoph / Gebauer, Klaus / Josef, Olaf | SAE Technical Papers | 2004


    Transients of Electromagnetic Valve Train (EMVT) Actuators

    Hartwig, C. / Josef, O. / Gebauer, K. et al. | British Library Conference Proceedings | 2004


    Improved robustness and energy consumption for sensorless electromagnetic valve train

    Gunselmann,C. / Melbert,J. / Univ.Bochum,DE | Kraftfahrwesen | 2003