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1. WO2020207555 - A HYDRAULIC SYSTEM AND A METHOD FOR CONTROLLING THE SAME

Publication Number WO/2020/207555
Publication Date 15.10.2020
International Application No. PCT/EP2019/058832
International Filing Date 08.04.2019
IPC
F15B 11/04 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
11Servomotor systems without provision for follow-up action
02Systems essentially incorporating special features for controlling the speed or the actuating force or speed of an output member
04for controlling the speed
CPC
F15B 1/024
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
1Installations or systems with accumulators; Supply reservoir or sump assemblies
02Installations or systems with accumulators
024used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
F15B 11/04
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
11Servomotor systems without provision for follow-up action; ; Circuits therefor
02Systems essentially incorporating special features for controlling the speed or actuating force of an output member
04for controlling the speed
F15B 2201/51
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
2201Accumulators
50Monitoring, detection and testing means for accumulators
51Pressure detection
F15B 2201/515
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
2201Accumulators
50Monitoring, detection and testing means for accumulators
515Position detection for separating means
F15B 2211/20515
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
2211Circuits for servomotor systems
20Fluid pressure source, e.g. accumulator or variable axial piston pump
205Systems with pumps
20507Type of prime mover
20515Electric motor
F15B 2211/20538
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
2211Circuits for servomotor systems
20Fluid pressure source, e.g. accumulator or variable axial piston pump
205Systems with pumps
2053Type of pump
20538constant capacity
Applicants
  • VOLVO CONSTRUCTION EQUIPMENT AB [SE]/[SE]
  • NORRHYDRO OY [FI]/[FI]
Inventors
  • SAHLMAN, Mika
  • MÄKITALO, Jussi
  • LAPPALAINEN, Ari
  • STAMBRO, Peter
Agents
  • KRANSELL & WENNBORG KB
Priority Data
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) A HYDRAULIC SYSTEM AND A METHOD FOR CONTROLLING THE SAME
(FR) SYSTÈME HYDRAULIQUE ET PROCÉDÉ DE COMMANDE ASSOCIÉ
Abstract
(EN)
A hydraulic system (10) for driving a rotatable load comprises: a high-pressure line (40) for hydraulic fluid; a pump (12) configured to supply pressurized hydraulic fluid to the high-pressure line (40); a variable displacement hydraulic machine (22) connected by a fluid connection to the high-pressure line (40) for rotationally driving the rotatable load; an electronic control unit (30); an energy storing device (26) connected to the high-pressure line (40) and configured to communicate with the high-pressure line by receiving energy from the high- pressure line and/or supplying energy to the high-pressure line; and a first detector (34, 36) configured to detect the amount of energy stored in the energy storing device (26) and to transmit a signal (50) indicating said amount of energy stored to the electronic control unit (30). The electronic control unit (30) is configured to control the volume flow intake of the variable displacement hydraulic machine (22) dependent on a target output of the variable displacement hydraulic machine and on the detected amount of energy stored in the energy storing device (26).
(FR)
L'invention concerne un système hydraulique (10) destiné à commander une charge rotative, comprenant : une ligne haute pression (40) pour fluide hydraulique ; une pompe (12) configurée pour acheminer un fluide hydraulique sous pression vers la ligne haute pression (40) ; une machine hydraulique à cylindrée variable (22) reliée par une connexion fluidique à la ligne haute pression (40) pour entraîner en rotation la charge rotative ; une unité de commande électronique (30) ; un dispositif de stockage d'énergie (26) relié à la ligne haute pression (40) et configuré pour communiquer avec la ligne haute pression par réception d'énergie provenant de la ligne haute pression et/ou par fourniture d'énergie à la ligne haute pression ; et un premier détecteur (34, 36) configuré pour détecter la quantité d'énergie stockée dans le dispositif de stockage d'énergie (26) et pour transmettre à l'unité de commande électronique (30) un signal (50) indiquant ladite quantité d'énergie stockée. L'unité de commande électronique (30) est configurée pour commander l'admission de flux volumétrique de la machine hydraulique à cylindrée variable (22) en fonction d'une sortie cible de ladite machine et de la quantité détectée d'énergie stockée dans le dispositif de stockage d'énergie (26).
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