Effective and precise torque estimation is a great opportunity to improve actual torque-based engine management strategies. Modern ECU often already implement algorithms to estimate on-board the torque that is being produced by the engine, even if very often these estimation algorithms are based on look-up tables and maps and cannot be employed for example for diagnostic purposes.The indicated torque estimation procedure presented in this paper is based on the measurement of the engine speed fluctuations, and is mainly based on two separated steps.As a first step a torsional behavior model of the powertrain configuration is developed. The engine-driveline torsional model enables to estimate the indicated torque frequency component amplitude from the corresponding component of the instantaneous engine speed fluctuation. This estimation can be performed cycle by cycle and cylinder by cylinder.As a second step the analysis of the relationship between the indicated torque mean value over an engine cycle and the amplitude of its frequency components, allowed defining the final estimation algorithm that reconstructs the indicated torque mean value starting from the instantaneous engine speed fluctuation analysis.The developed approach has been applied with success to a diesel engine mounted on-board a vehicle. The obtained precision is compatible with on-board application like for example torque-based engine management strategies.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Powertrain Torsional Model Development or On-Board Indicated Torque Estimation


    Additional title:

    Sae International Journal of Passenger Cars- Electronic and Electrical Systems
    Sae Int. J. Passeng. Cars – Electron. Electr. Syst


    Contributors:

    Conference:

    SAE World Congress & Exhibition ; 2008



    Publication date :

    2008-04-14


    Size :

    11 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Powertrain torsional model development for on-board indicated torque estimation

    Ponti,F. / Serra,G. / Lupo,S. et al. | Automotive engineering | 2008


    2008-01-1017 Powertrain Torsional Model Development for On-Board Indicated Torque Estimation

    Ponti, F. / Serra, G. / Lupo, S. et al. | British Library Conference Proceedings | 2008



    Indicated torque estimation using a torsional behavior model of the engine

    Ponti,F. / Univ.of Bologna,DIEM,IT | Automotive engineering | 2005