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.
POWER REGENERATION DEVICE FOR WORK MACHINE AND WORK MACHINE
STROMRÜCKGEWINNUNGSVORRICHTUNG FÜR EINE ARBEITSMASCHINE UND ARBEITSMASCHINE
DISPOSITIF DE RÉCUPÉRATION D'ÉNERGIE POUR MACHINE DE CHANTIER ET MACHINE DE CHANTIER
2018-05-30
Patent
Electronic Resource
English
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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