Classifications

• • 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
  • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
  • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
  • F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
  • F15B11/0423—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in" by controlling pump output or bypass, other than to maintain constant speed
• • 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
• • 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
• • 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
  • F15B2211/31—Directional control characterised by the positions of the valve element
  • F15B2211/3105—Neutral or centre positions
  • F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
• • 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
  • F15B2211/31—Directional control characterised by the positions of the valve element
  • F15B2211/3105—Neutral or centre positions
  • F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
• • 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
  • F15B2211/321—Directional control characterised by the type of actuation mechanically
  • F15B2211/324—Directional control characterised by the type of actuation mechanically manually, e.g. by using a lever or pedal
• • 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
  • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
• • 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
  • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
  • F15B2211/41509—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source 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
  • F15B2211/40—Flow control
  • F15B2211/42—Flow control characterised by the type of actuation
  • F15B2211/426—Flow control characterised by the type of actuation electrically or electronically
• • 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
  • F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
• • 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
  • F15B2211/455—Control of flow in the feed line, i.e. meter-in 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
  • F15B2211/63—Electronic controllers
  • F15B2211/6303—Electronic controllers using input signals
  • F15B2211/634—Electronic controllers using input signals representing a state of a 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
  • F15B2211/60—Circuit components or control therefor
  • F15B2211/665—Methods of control using electronic components
  • F15B2211/6654—Flow rate 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
  • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
  • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
  • F15B2211/7051—Linear output members
  • F15B2211/7052—Single-acting output members
• • 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
  • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
  • F15B2211/7051—Linear output members
  • F15B2211/7053—Double-acting output members
• • 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
• • 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
  • F15B2211/75—Control of speed of the output member

Definitions

• the present invention relates to a hydraulic control device that controls a plurality of hydraulic actuating units provided in a construction machine or the like.
• the first shock level includes hydraulic actuators such as a boom cylinder, an arm cylinder, a bolt cylinder, a turning motor, and a driving motor. O Yue has been set up o
• each of the hydraulic actuators is connected between the hydraulic actuator and the hydraulic power source.
• An operation valve for flow rate control is interposed, and pressure oil whose flow rate is controlled by these operation valves is supplied to the corresponding hydraulic actuator 0
• Each of the above operation valves 4 and 5 includes a pump port a, a tang port b, a first actuating port c, and a second actuating port. d and a drain passage e are provided.
• the operating valve 4 has the opening degree (opening area) between the ports a and c and between the ports a and d with respect to the amount of operation, respectively.
• the opening between ports b and c and the opening between ports b and d are changed to the characteristic A2 in FIG. Therefore, the manipulated variable-opening characteristic is set so that the opening degree of the passage e changes according to the characteristic A3 in the same figure.
• the operating valve 5 has an opening (opening area) between the ports a and c and between the ports a and d with respect to the amount of operation.
• the force between the ports b and c and the opening between the ports b and d change to the characteristic B2 in the same figure.
• the opening of the passage e is changed to the characteristic B 3 in the same figure so that the The manipulated variable-opening characteristic is set so that it changes accordingly.
• the operating valve 5 is set to have a larger decrease rate of the opening degree of the passage e than the operating valve 4. This is based on the following principle.
• the operation valve 5 since the operation valve 5 supplies IE oil to the hydraulic cylinder 2 for heavy load, the operation valve 5 is operated after the operation is started. It is necessary to increase the absorption torque of the pump 3 by rapidly reducing the drain flow rate through the passage e. Therefore, in the control valve 5, the opening degree of the passage e is changed based on the characteristic B in which the decreasing rate of the opening degree is large.
• variable throttle having the above characteristic A 1
• drain path e acts as a variable throttle having the above characteristic A 3 respectively.
• the variable apertures of the former and the latter are indicated by reference numerals 6 and 7, respectively.
• the passage between the ports a and c or the passage between the ports a and d of the operation valve 5 is a variable having the above characteristic B1.
• the drain passage e acts as a variable restriction having the above characteristic B3
• FIG. 9 shows the former and the latter variable restriction.
• the operation amount of the control valve 5 is shown in FIG.
• the opening of the passage e of the operating valve 4 substantially follows the characteristic A4 indicated by the dotted line in FIG. Change .
• the purpose of the present invention is to supply oil having a flow rate adapted to the combined operation to the discharge path of the pump when the multiple control valves are operated.
• Another object of the present invention is to provide a hydraulic control device capable of smoothly controlling a hydraulic actuator. Disclosure of the invention
• a separate operating valve for controlling the amount of oil supplied to the hydraulic actuators is provided.
• the interposed hydraulic control device In the interposed hydraulic control device,
• Opening characteristic setting means preset as the opening characteristic of the solenoid valve
• Operation detection means for detecting that each of the operation valves is being operated
• the operation valve for the individually operated operation valve is independently operated.
• the opening degree of the solenoid valve is controlled according to the degree characteristic and when two or more of the operation valves are operated in a combined manner, the combined operation river opening characteristic is adopted.
• the opening of the solenoid valve is controlled.
• the opening characteristics for individual operation described above should be set so as to be suitable for the load of the hydraulic actuator to which they are applied.
• the opening characteristics for composite operation are set so as to be suitable for the load during operation of multiple units. In this way, it is possible to smoothly and individually control the individual hydraulic actuating units.
• Fig. 1 is a circuit diagram showing an example of a hydraulic circuit of a hydraulic control device according to the present invention
• Fig. 2 is a block diagram conceptually showing a means for controlling a flow control solenoid valve
• Fig. 3 is a graph illustrating the opening characteristics for controlling the flow control solenoid valve
• Fig. 4 is the controller shown in Fig. 2.
• FIG. 5 is a circuit diagram illustrating a hydraulic circuit of a conventional hydraulic control device
• FIGS. 6 and 7 are operation diagrams shown in FIG. 5, respectively.
• the graphs shown, and Figs. 8 and 9 are hydraulic circuit diagrams showing the operation of each operating valve shown in Fig. 5, respectively.
• FIG. 1 shows an example of a hydraulic circuit in a hydraulic control device of the present invention.
• a solenoid valve 11 for flow control if] is connected in parallel to a hydraulic pump 10.
• the solenoid valve 11 is configured such that the degree of opening of the passage between the input port a and the output port b is inversely proportional to the human-powered current, and the control illustrated in FIG. Controlled by means.
• the operating valves 12 and 13 are each provided with a pump port a. Are connected to the hydraulic pump 10 and the tank ports b are connected to the tanks 14, respectively.
• the second actuating port d is connected to the head-side oil chamber and the bottom-side oil chamber of the light-load hydraulic cylinder 15 respectively.
• the first actuating port c and the second actuating port d of the operating valve 13 are each a heavy-load hydraulic cylinder. It is connected to the head side oil chamber and the bottom side oil chamber of 16.
• the operating valves 1 and 2 have the opening (opening area) force between ports a and c and between ports a and d with respect to the amount of operation. As shown in the figure, the force applied to the characteristic A1; and the degree of opening between the ports b and c and between the ports b and d are changed as shown in FIG. It is configured to change according to A2.
• the operating valve 13 has the characteristic B1 in Fig. 7 with respect to the manipulated variable in terms of the opening between the ports a and c and between the ports a and d.
• the force between the ports b and c and the degree of opening between the ports b and d have the characteristic B2 in the figure, respectively, so that the force varies. It is configured to change.
• the potentiometers 17 and: 18 are linked with the operating levers 12a and 13b of the operating valves 12 and 13 respectively. These potentiometers: I7 and 18 are used to generate signals S1 and S2 corresponding to the manipulated variables of operation valves 12 and 13 respectively. Each signal is output, and these signals are input to the controller 19, and the memory 20 stores the opening degree characteristics of the solenoid valve 11.
• FIG. 3 exemplifies this opening characteristic.
• reference character D denotes the opening characteristic of the solenoid valve 1] applied when the operating valve 12 is operated alone.
• the symbol E applies when the operating valve 13 is operated independently, and the opening characteristic of the operating valve 11 is applied.
• the characteristic F applies when the operating valves ⁇ 2 and 13 are operated in combination. This shows the opening characteristics of the same valve 11 respectively.
• the horizontal axis represents the operation amount of the operation valve 12 for the opening characteristic D, and the operation amount of the operation valve 13 for the opening characteristic ⁇ .
• the horizontal axis indicates the operating amount of one of the operating valves 12 and 13, or more specifically, the larger of the operating amounts of the operating valves 12 and 13. Indicates the manipulated variable.
• the operating valve 12 Since the operating valve 12 is operated when the light-load hydraulic cylinder 15 is operated, the operating valve 12 is operated when the operating valve 12 is operated alone. It is necessary to take care not to supply an excessive amount of oil to the hydraulic cylinder 15; This is because, if more oil is supplied to the cylinder 15 than necessary, a high oil pressure acts on the cylinder 15 to prevent the cylinder 15 from being controlled smoothly. And others.
• the characteristic D is set so that the opening degree of the solenoid valve 11 decreases gradually with the increase in the operation amount of the operation valve 12. It is set so that an appropriate amount of oil is supplied to the light-load hydraulic cylinder 15 during single operation of 2.
• the characteristic E is such that the opening of the solenoid valve 11 starts to decrease earlier than the characteristic D, and the decreasing gradient of the opening is that of the characteristic D. Is set to be larger.
• the characteristic F is set so that the gradient of the decrease in the relation of the solenoid valve 11 is greater than that of the characteristic E.
• FIG. 4 shows the processing performed by the controller 9. An example of the control procedure will be shown, and the operation of this embodiment will be described below with reference to FIG.
• the operation and non-operation of the operating valve 12 is determined based on the output signal S1 of the potentiometer 17 (step 1). 0), and the operation or non-operation of the operation valve 13 is determined based on the output signal S2 of the potentiometer 17 (step 101). ).
• the characteristic F shown in FIG. 3 is selected for the platform where it is determined that both the operation valves 12 and 13 are being operated (step 10 2). Then, the magnitudes of the signals S 1 and S 2 are compared (step 103).
• step 104 If it is determined in step 103 that S 1 ⁇ S 2, the opening on the characteristic F corresponding to the operation amount of the operation valve 12 is read from the memory 2 () force and reading. It is output to a valve control signal S f camp 21 for instructing the opening degree (step 104).
• step 103 If it is determined in step 103 that S1 is less than S2, the opening on the characteristic F corresponding to the operation amount of the operation valve 13 is changed from memory 20. reading is out, and the bus Norre blanking control signal you commanding a-opening degree S f r is Ru is output to the ⁇ down-flops 2 1 (scan STEP 1 0 5).
• the opening of the solenoid valve 1] is controlled according to the characteristic F in a situation where the operating valves 12 and 13 are operated in a combined manner.
• step 101 the operating valve 13 is operated. If it is determined that the operation is not performed, that is, if the operation valve 12 is operated alone, the characteristic D shown in FIG. Top 106). Then, the opening on the characteristic D corresponding to the operation amount of the operation valve 12 is read out from the memory 20, and the valve control signal S d, which commands the opening, is read. The signal is output to the amplifier 21 (step 107).
• step 100 If it is determined in step 100 that the operating valve 12 is not operated, then in step 108, the operating of the operating valve 3 is performed. Non-operation is determined. And Steps :! If it is determined in step 08 that the operation valve 13 is not operated, the procedure force is returned. In this case, no actuation signal is applied to the solenoid valve 11 and therefore the m-valve] .1 is left open.
• Step]. 08 that is, in the case where the operation valve 13 is operated alone In this case, the characteristic E shown in Fig. 3 is selected (step:! [) 9). Then, the opening on the characteristic E corresponding to the operation amount of the operating valve 13 is read out from the memory 20 and the valve control signal S e force ⁇ The signal is output to the amplifier 21 (step 110).
• the amount of oil supplied to the cylinders 15 and 6 during the combined operation of the operation valves 12 and 13 is reduced by electromagnetic force. It is determined by the opening of the valve 11. As described above, if the opening of the solenoid valve 11 is controlled based on the opening characteristic F for combined operation as described above, the amount of oil adapted to the magnitude of the load can be reduced. It can be supplied to Wang Cylinders 1-5, 16 and as a result, the controllability of those hydraulic cylinders is improved.
• the opening characteristics for the combined operation are not limited to the characteristics F described above.
• the characteristic E is adopted as the opening characteristic for the combined operations, there is no practical disadvantage. Does not occur o
• one hydraulic cylinder 15 for light load and one cylinder 16 for heavy load are used as the hydraulic actuator.
• the present invention can also be applied to hydraulic control of three or more hydraulic actuating units having different loads acting on each other.
• the individual hydraulic actuators are connected to the hydraulic pumps via separate operation valves. O, and a solenoid valve for flow control (corresponding to the solenoid valve 11 in the above embodiment) is connected to the hydraulic pump in parallel.
• Each of the above operating valves is operated independently or in combination according to the work form, so the solenoid valve for single operation which is applied when the individual operating valves are operated independently as in the above embodiment
• the opening characteristics are set individually, and the opening characteristics of the multi-unit operation solenoid valve to be applied when the above-mentioned operation valves are combined are set.
• the solenoid valve opening characteristic to be applied to the single operation is selected, and the single valve operation is performed with the opening characteristic.
• the opening of the solenoid valve is set based on the operation amount of the operation valve and.
• each solenoid valve for individual operation should be adapted to the magnitude of the load acting on each hydraulic actuator as in the above embodiment. It is preset.
• the solenoid valve opening characteristics for compound operation are selected. Then, the opening of the solenoid valve is set based on the maximum operation amount among the operation amounts of the operation valves that are operated in a combined manner and the opening characteristic of the double palpitating action electromagnetic valve.
• the hydraulic control device according to the invention of the present invention is capable of appropriately operating a plurality of hydraulic actuators in a combined manner, and is particularly useful as a hydraulic control means applied to construction machinery.

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

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=15856144

Family Applications (1)

Country Status (4)

Cited By (2)

Families Citing this family (10)

Citations (3)

Family Cites Families (4)

• 1988
  • 1988-12-27 JP JP1988167789U patent/JPH0288005U/ja active Pending
• 1989
  • 1989-12-27 EP EP19900901035 patent/EP0451274A4/en not_active Withdrawn
  • 1989-12-27 WO PCT/JP1989/001309 patent/WO1990007651A1/ja not_active Application Discontinuation
  • 1989-12-27 KR KR1019900701732A patent/KR910700415A/ko not_active Withdrawn

Patent Citations (3)

Non-Patent Citations (1)

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