In a lowering operation of a boom 111, the amount of operation of a control lever 4a is detected by a pressure sensor 16 and input to a controller 9. Based on the input operation amount, the controller 9 obtains a target flow rate Q 0 of return oil discharged from a boom cylinder 3, calculates a deviation Q between the target flow rate Q 0 and an actual flow rate Q obtained from an actual rotation speed N of an electric motor 12 acquired by a rotation speed sensor 17, calculates a signal Sm for controlling the opening area of a proportional solenoid valve 7 in a manner allowing hydraulic fluid to flow to a control valve 2 in just as much as Q, and controls an operation pilot pressure of the control valve 2 supplied from a sub-pump 8 in accordance with the signal Sm so that the hydraulic fluid will flow to the control valve 2 exactly in the amount of Q. This ensures responsiveness of a hydraulic actuator when it starts to move and permits more energy to be recovered by the power regeneration device and a working machine furnished with the power regeneration device.


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    Title :

    POWER REGENERATION DEVICE FOR WORK MACHINE AND WORK MACHINE


    Additional title:

    STROMRÜCKGEWINNUNGSVORRICHTUNG FÜR EINE ARBEITSMASCHINE UND ARBEITSMASCHINE
    DISPOSITIF DE RÉCUPÉRATION D'ÉNERGIE POUR MACHINE DE CHANTIER ET MACHINE DE CHANTIER


    Contributors:

    Publication date :

    2018-05-30


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    E02F Baggern , DREDGING / B66F HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last / F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein



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