Optimal control of a wheel loader operating in the short loading cycle is studied in order to investigate the potentials for fuel consumption reduction while maintaining acceptable production rates. The wheel loader is modeled as a system with five states and three control inputs including torque converter nonlinearities. The torque converter is modeled with no lockup enabling power transmission in both directions. The geometry of the wheel loader boom and the demanded force in the lift cylinders during lifting are used to ensure that the in-cylinder pressure remains below component's limits. The lift-transport section of the short loading cycle is divided into four phases due to discontinuities in the gearbox ratios and fuel consumption is calculated in each phase. Time optimal and fuel optimal transients of the system and the power consumption in each and every component is presented showing the dominance of the torque converter losses compared to the other components especially in the time optimal solutions. It is shown that introducing path constraints on the maximum lifting speed of the bucket due to limitations in hydraulic pumping speed moves the diesel engine operation towards higher speeds in order to maintain the lifting speed. Trade-off between fuel optimal and time optimal transients is calculated which is found to be in agreement with the results of experimental studies.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Modeling and optimal control of a wheel loader in the lift-transport section of the short loading cycle


    Contributors:
    Nezhadali, V. (author) / Eriksson, L. (author) / Fröberg, A. (author)


    Publication date :

    2013


    Size :

    6 Seiten, Bilder, Tabellen, Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    WHEEL LOADER, METHOD FOR CONTROLLING WHEEL LOADER, AND SYSTEM FOR CONTROLLING WHEEL LOADER

    ENOMOTO RYOTA / IKARI MASANORI / YAJIMA KENTARO et al. | European Patent Office | 2019

    Free access

    Wheel loader

    AOYAMA YUICHIRO | European Patent Office | 2017

    Free access

    Wheel loader

    KANAMORI SHIROU | European Patent Office | 2015

    Free access

    WHEEL LOADER

    YOSHIHARA NAOHIRO / SAKAMOTO KENTARO | European Patent Office | 2019

    Free access

    WHEEL LOADER

    TANAKA SHINICHIRO / KODERA HIROYASU | European Patent Office | 2019

    Free access