EP0550257B1 - Dispositif de commande pour plusieurs servomoteurs - Google Patents

Dispositif de commande pour plusieurs servomoteurs Download PDF

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Publication number
EP0550257B1
EP0550257B1 EP19920311770 EP92311770A EP0550257B1 EP 0550257 B1 EP0550257 B1 EP 0550257B1 EP 19920311770 EP19920311770 EP 19920311770 EP 92311770 A EP92311770 A EP 92311770A EP 0550257 B1 EP0550257 B1 EP 0550257B1
Authority
EP
European Patent Office
Prior art keywords
pressure
actuators
valve
pilot
fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19920311770
Other languages
German (de)
English (en)
Other versions
EP0550257A1 (fr
Inventor
Hideshi Koiwai
Hisato Naito
Yoshitake Yonekubo
Kenichi Nishiumi
Yoshimi Hasegawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KYB Corp
Original Assignee
Kayaba Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP03357128A external-priority patent/JP3124094B2/ja
Priority claimed from JP21224492A external-priority patent/JPH0633904A/ja
Priority claimed from JP04250517A external-priority patent/JP3128775B2/ja
Application filed by Kayaba Industry Co Ltd filed Critical Kayaba Industry Co Ltd
Priority to EP95202288A priority Critical patent/EP0684388B1/fr
Priority to EP95202286A priority patent/EP0684387B1/fr
Priority to EP95202287A priority patent/EP0684389B1/fr
Publication of EP0550257A1 publication Critical patent/EP0550257A1/fr
Application granted granted Critical
Publication of EP0550257B1 publication Critical patent/EP0550257B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2296—Systems with a variable displacement pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/162—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for giving priority to particular servomotors or users
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/163—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for sharing the pump output equally amongst users or groups of users, e.g. using anti-saturation, pressure compensation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/166—Controlling a pilot pressure in response to the load, i.e. supply to at least one user is regulated by adjusting either the system pilot pressure or one or more of the individual pilot command pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/25—Pressure control functions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • F15B2211/3053—In combination with a pressure compensating valve
    • F15B2211/30555—Inlet and outlet of the pressure compensating valve being connected to the directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40576—Assemblies of multiple valves
    • F15B2211/40584—Assemblies of multiple valves the flow control means arranged in parallel with a check valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/46—Control of flow in the return line, i.e. meter-out control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/47—Flow control in one direction only
    • F15B2211/473—Flow control in one direction only without restriction in the reverse direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5153—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/575—Pilot pressure control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • F15B2211/6054—Load sensing circuits having valve means between output member and the load sensing circuit using shuttle valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/65—Methods of control of the load sensing pressure
    • F15B2211/654—Methods of control of the load sensing pressure the load sensing pressure being lower than the load pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders

Definitions

  • the present invention relates to a device for controlling multiple hydraulic actuators and, more particularly, to a device for controlling multiple hydraulic actuators to protect a system from an overpressure caused by increasing the load on an individual actuator.
  • the present invention can be applied, for example, to such a system as a power shovel that operates such multiple actuators as a spin motor, a boom cylinder, an arm cylinder, a bucket cylinder, and a driving motor.
  • An object of the present invention is to provide a device for controlling multiple actuators that overcomes the drawbacks of the prior art device.
  • a further object of the present invention is to provide a device for controlling multiple actuators where the fluid drained from the variable drain pump is not lost, so that all actuators can continue to work even when their load pressure rises.
  • the present invention provides a device for controlling multiple hydraulic actuators to protect a system from an overpressure caused by increasing the load on an individual actuator.
  • the device of the present invention prevents the shutdown of the device caused by too much fluid going to the actuator operating at the maximum pressure. Thus, all actuators continue to operate even if one is overpressured.
  • a load sensing active hydraulic control device comprises a tank for containing hydraulic fluid, a plurality of actuators, a pump connecting to said plurality of actuators and to said tank, said pump being effective for pumping said hydraulic fluid, each of said plurality of actuators having at least one directional switching valves respectively, said directional switching valves being connected in parallel, each of said switching valves having at least one pilot chamber and a pair of variable orifices, said variable orifices being open an amount responsive to a pressure in said at least one pilot chamber, a pressure compensating valve being connected to said variable orifices whereby a pressure difference is maintained between a load pressure on one of said actuators and a pressure downstream of said variable orifices, and means provided for controlling the output of said pump according to the highest load pressure of any of said plurality of actuators characterised in that at least one switching pilot valve is connected downstream of said switching valves to at least one of the fluid lines whereby a maximum pressure is fixed for said plurality of actuators, whereby, when said
  • a variable drain pump 1 is connected to two ports 5 associated respectively with a first directional switching valve 3 and a second directional switching valve 4 through a high pressure fluid line 2.
  • Two pairs of pilot chambers 3a, 3b and 4a, 4b are respectively attached to opposite sides of the respective switching valves 3 and 4 and are coupled to pilot operating valves V1 and V2 whereby pilot operation valves V1 and V2 control an output pilot pressure.
  • Switching valves 3 and 4 are normally in a neutral position and ports 5,5 are closed (as illustrated). Switching valves 3 and 4 are each provided with a pair of variable orifices 6, 6'. Placing either of switching valves 3 or 4 in either a left or a right position by operation of pilot valves V1, V2 opens the pair of variable orifices 6, 6' associated with that valve. The opening of the pair of variable orifices 6, 6' is proportional to the setting of the valve.
  • a pressure compensating valve 8 Downstream of the each pair of variable orifices 6, 6' is a pressure compensating valve 8 connected to its respective valve 3, 4 through a check valve 7.
  • Each of switching valves 3 and 4 also has a supply port 9 that is connected to the downstream side of pressure compensating valve 8.
  • Supply ports 9, 9 are closed when switching valves 3 and 4 are at a neutral position illustrated in Figure 1. Moving switching valves 3, 4 to either a left or a right position couples supply ports 9, 9 with either one of a pair of actuator ports 10, 11 and connects the other actuator port with a tank fluid line 12.
  • a load detecting port 13, 13 of each switching valve 3 and 4 is connected with tank fluid line 12 when switching valves 3 and 4 are in a neutral position.
  • each load detecting port 13 is connected to the actuator port 10, 11 with the higher pressure.
  • Each pair of actuator ports 10 and 11 of switching valves 3 and 4 is connected respectively to respective ends of a pair of cylinders or actuators 19 and 20 through a pair of fluid lines 17 and 18 to which a respective overload relief valve 21, 22 is connected.
  • Pressure compensating valves 8, 8 equalize the respective pressures on the upstream side of check valves 7, 7 to that of pilot chambers 8a, 8a and the respective pressures of load detecting ports 13, 13 to that of pilot chambers 8b, 8b.
  • a shuttle valve 14 transfers to pilot chamber 8b the highest pressure of any one among the actuators controlled by switching valves 3 and 4.
  • Pressure compensating valve 8 operates at the pressure of the lower of the pair of variable orifices 6, 6', that is at a fixed rate higher than the maximum load pressure from one of the actuators 19, 20.
  • the maximum load pressure chosen by shuttle valve 14 is transferred to a pilot chamber 15a of a control valve 15, and a pilot chamber 15b has the pressure of high pressure fluid line 2 or the pressure of variable drain pump 1.
  • the difference between the pressure of variable drain pump 1 and the maximum load pressure actuates control valve 15.
  • Control valve 15 operates control cylinder 16, which runs at constant power, to keep the pressure from variable drain pump 1 at a fixed rate higher than the maximum load pressure.
  • pilot operating valves V1 and V2 supply a pilot pressure to either pilot chambers 3a, 3b of switching valve 3 or pilot chambers 4a, 4b of switching valve 4.
  • pilot pressure from pilot chamber 3b shifts switching valves 3 to the right position.
  • pilot pressure from pilot chamber 4b shifts switching valve 4 to the right position.
  • variable drain pump 1 supplies amounts of fluid under pressure that correspond to the ratio of each pair of variable orifices.
  • the fluid in top cylinder chambers 19b, 20b returns to tank fluid line 12 through switching valves 3 and 4.
  • Control cylinder 16 controls the quantity of fluid supplied from pump 1 according to the maximum load pressure required at any one or more of the actuators 19, 20.
  • variable drain pump 1 depends on the product of a pressure P and a quantity of fluid Q, which product is fixed. Thus, the higher the maximum load pressure, the less the amount of fluid drained from variable drain pump 1. The amount drained corresponds to the ratio of the pair of variable orifices 6, 6' of either switching valve 3 or switching valve 4.
  • variable drain pump 1 since the drain pressure of variable drain pump 1 is controlled by the maximum load pressure on multiple actuators, a difficulty can arise in its operation.
  • cylinder 20 makes a full stroke.
  • the load increases so that either overload relief valve 21 or overload relief valve 22, connected to respective sides of piston in cylinder 20, opens.
  • the amount of fluid that drains from variable drain pump 1 decreases, according to the curve of Figure 2, since the amount of power is fixed. Therefore the supply of fluid to switching valve 3 is reduced, and, in the worst case, cylinder 19 comes to a complete stop.
  • pilot valve 25 is connected to a pilot valve 25 through a pilot line 24 that continues after the valve 25 to tank T. Pilot valve 25 is biassed to its illustrated closed position by a spring 26 at one side. A pilot chamber 27 at its opposite side is coupled to the fluid line 18 from actuator cylinder 20 so that both have the same pressure. Hence, pilot valve 25 is opened when the pressure in fluid line 18, i.e. the load pressure of the cylinder 20, opens an overload relief valve 22.
  • pilot valve 25 The connection of pilot chamber 4b of switching valve 4 to tank T is controlled by switching pilot valve 25. Normally, pilot line 24, which contains an orifice 28, is closed. Pilot line 24 is also connected to the pilot operation valve V2 through an orifice 29.
  • variable orifices 6, 6' of switching valve 3 If one of the variable orifices 6, 6' of switching valve 3 is opened to the minimum setting, then the pair of variable orifices 6, 6' of switching valve 4 is opened to the maximum.
  • a full stroke of cylinder 20 raises the pressure in fluid line 18 and opens pilot valve 25 and as a result, pilot chamber 4b of switching valve 4 makes a connection with tank T.
  • the pressure in both the pilot line 24 and fluid line 18 is decreased, and switching valve 4 therefore returns to a neutral position, thereby reducing the opening of the pair of variable orifices 6, 6'. As a result, the amount of fluid flowing to cylinder 20 is decreased.
  • variable orifices 6, 6' of switching valve 4 when the opening of one of the pair of variable orifices 6, 6' of switching valve 4 becomes less than the opening of the pair of variable orifices 6, 6' of switching valve 3, the amount of fluid from variable drain pump 1 is decreased in proportion to the ratio of the two levels, so that fluid under pressure is supplied to fluid cylinder 19 connected to switching valve 3.
  • pilot valve 25 is connected only to bottom chamber 20a of cylinder 20. Pilot valve 25 may also connect to a single fluid line 17 or to both fluid lines 17 and 18.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Claims (1)

  1. Dispositif de commande hydraulique actif de détection de charge, qui comprend un réservoir destiné à contenir un fluide hydraulique, une pluralité d'actionneurs (19, 20), une pompe (1) se raccordant à ladite pluralité d'actionneurs (19, 20) et audit réservoir, ladite pompe (1) ayant pour fonction de pomper ledit fluide hydraulique, chacun des actionneurs de ladite pluralité d'actionneurs (19, 20) comportant au moins une vanne d'aiguillage directionnelle (3, 4) respective, lesdites vannes d'aiguillage directionnelles (3, 4) étant reliées en parallèle, chacune desdites vannes d'aiguillage (3, 4) comportant au moins une chambre pilote (3a, 3b, 4a, 4b) et une paire d'orifices variables (6, 6'), lesdits orifices variables (6, 6') étant ouverts selon un degré d'ouverture fonction de la pression régnant dans ladite au moms une chambre pilote (3a, 3b, 4a, 4b), une vanne de compensation de pression (8) étant reliée auxdits orifices variables (6, 6'), de telle sorte qu'une différence de pression soit maintenue entre une pression de charge s'exerçant sur l'un desdits actionneurs (19, 20) et une pression s'exerçant en aval desdits orifices variables (6, 6'), et des moyens (15, 16) prévus pour commander la soitie de ladite pompe (1) selon la pression de charge la plus élevée de l'un quelconque des actionneurs de ladite pluralité d'actionneurs (19, 20), caractérisé en ce qu'au moins une vanne d'aiguillage pilote (25) est reliée, en aval desdites vannes d'aiguillage (3, 4), à au moins l'une des canalisations de fluide (17, 18), afin qu'une pression maximale soit fixée pour ladite pluralité d'actionneurs (19, 20), de telle sorte que, lorsque ladite pression de charge s'élève jusqu'à une pression suffisante pour actionner ladite au moins une vanne d'aiguillage pilote (25), ladite au moins une chambre pilote (3a, 3b, 4a, 4b) soit reliée audit réservoir.
EP19920311770 1991-12-25 1992-12-23 Dispositif de commande pour plusieurs servomoteurs Expired - Lifetime EP0550257B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP95202288A EP0684388B1 (fr) 1991-12-25 1992-12-23 Système de commande hydraulique de détection de la charge
EP95202286A EP0684387B1 (fr) 1991-12-25 1992-12-23 Système de commande hydraulique de détection de la charge
EP95202287A EP0684389B1 (fr) 1991-12-25 1992-12-23 Système de commande pour appareil hydraulique avec plusieurs consommateurs

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP357128/91 1991-12-25
JP03357128A JP3124094B2 (ja) 1991-12-25 1991-12-25 複数アクチュエータの制御装置
JP212244/92 1992-07-16
JP21224492A JPH0633904A (ja) 1992-07-16 1992-07-16 負荷感応形制御装置
JP250517/92 1992-08-26
JP04250517A JP3128775B2 (ja) 1992-08-26 1992-08-26 負荷感応形制御装置

Related Child Applications (6)

Application Number Title Priority Date Filing Date
EP95202288.7 Division-Into 1992-12-23
EP95202286.1 Division-Into 1992-12-23
EP95202287A Division EP0684389B1 (fr) 1991-12-25 1992-12-23 Système de commande pour appareil hydraulique avec plusieurs consommateurs
EP95202288A Division EP0684388B1 (fr) 1991-12-25 1992-12-23 Système de commande hydraulique de détection de la charge
EP95202287.9 Division-Into 1992-12-23
EP95202286A Division EP0684387B1 (fr) 1991-12-25 1992-12-23 Système de commande hydraulique de détection de la charge

Publications (2)

Publication Number Publication Date
EP0550257A1 EP0550257A1 (fr) 1993-07-07
EP0550257B1 true EP0550257B1 (fr) 1998-05-06

Family

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Family Applications (4)

Application Number Title Priority Date Filing Date
EP95202287A Expired - Lifetime EP0684389B1 (fr) 1991-12-25 1992-12-23 Système de commande pour appareil hydraulique avec plusieurs consommateurs
EP19920311770 Expired - Lifetime EP0550257B1 (fr) 1991-12-25 1992-12-23 Dispositif de commande pour plusieurs servomoteurs
EP95202286A Expired - Lifetime EP0684387B1 (fr) 1991-12-25 1992-12-23 Système de commande hydraulique de détection de la charge
EP95202288A Expired - Lifetime EP0684388B1 (fr) 1991-12-25 1992-12-23 Système de commande hydraulique de détection de la charge

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP95202287A Expired - Lifetime EP0684389B1 (fr) 1991-12-25 1992-12-23 Système de commande pour appareil hydraulique avec plusieurs consommateurs

Family Applications After (2)

Application Number Title Priority Date Filing Date
EP95202286A Expired - Lifetime EP0684387B1 (fr) 1991-12-25 1992-12-23 Système de commande hydraulique de détection de la charge
EP95202288A Expired - Lifetime EP0684388B1 (fr) 1991-12-25 1992-12-23 Système de commande hydraulique de détection de la charge

Country Status (2)

Country Link
EP (4) EP0684389B1 (fr)
DE (4) DE69229968T2 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19719228A1 (de) * 1997-05-07 1998-11-12 Bosch Gmbh Robert Hydraulische Steuereinrichtung zur lastdruckunabhängigen Steuerung eines doppeltwirkenden Motors
DE19831595B4 (de) * 1998-07-14 2007-02-01 Bosch Rexroth Aktiengesellschaft Hydraulische Schaltung
FR2807118B1 (fr) * 2000-03-28 2002-07-05 Mannesmann Rexroth Sa Circuit hydraulique pour l'actionnement de recepteurs hydrauliques multiples
EP2635747B1 (fr) * 2010-11-01 2019-09-25 Volvo Construction Equipment AB Procédé pour commander un système hydraulique d'une machine à travailler
CN104627880B (zh) * 2014-12-31 2017-02-22 中联重科股份有限公司 闭式系统、控制方法、卷扬系统和履带式车辆行走系统
CN110671376B (zh) * 2019-09-29 2021-03-12 中国矿业大学 工程机械负载敏感-进出口独立液压系统及其控制方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3710699C1 (de) * 1987-03-31 1988-08-18 Heilmeier & Weinlein Hydraulische Steuervorrichtung fuer eine Verbrauchergruppe
SE8803181D0 (sv) * 1988-09-09 1988-09-09 Atlas Copco Ab Hydraulic driving system with a priority function for hydraulic motors
WO1990014519A1 (fr) * 1989-05-24 1990-11-29 Kabushiki Kaisha Komatsu Seisakusho Appareil a circuit hydraulique

Also Published As

Publication number Publication date
DE69225392T2 (de) 1998-09-03
DE69229966D1 (de) 1999-10-14
EP0684387B1 (fr) 1999-09-08
EP0684388A2 (fr) 1995-11-29
EP0684388B1 (fr) 1999-02-24
DE69228489D1 (de) 1999-04-01
DE69228489T2 (de) 1999-09-30
EP0550257A1 (fr) 1993-07-07
EP0684389A2 (fr) 1995-11-29
DE69229968T2 (de) 2000-03-09
DE69229966T2 (de) 2000-03-09
EP0684387A3 (fr) 1996-10-30
EP0684388A3 (fr) 1996-11-06
EP0684389B1 (fr) 1999-09-08
EP0684387A2 (fr) 1995-11-29
EP0684389A3 (fr) 1996-10-30
DE69229968D1 (de) 1999-10-14
DE69225392D1 (de) 1998-06-10

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