WO1997013929A1 - Systeme de commande d'engins de chantier - Google Patents
Systeme de commande d'engins de chantier Download PDFInfo
- Publication number
- WO1997013929A1 WO1997013929A1 PCT/JP1996/002926 JP9602926W WO9713929A1 WO 1997013929 A1 WO1997013929 A1 WO 1997013929A1 JP 9602926 W JP9602926 W JP 9602926W WO 9713929 A1 WO9713929 A1 WO 9713929A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- flow rate
- pump
- signal
- pressure
- working fluid
- Prior art date
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Classifications
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- 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
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- 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
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- 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
- E02F9/2025—Particular purposes of control systems not otherwise provided for
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- 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
- E02F9/2235—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps including an electronic controller
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- 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
- E02F9/2246—Control of prime movers, e.g. depending on the hydraulic load of work tools
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- 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
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- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
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- 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
- F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
- F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
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- 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
- F15B2211/30505—Non-return valves, i.e. check valves
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- 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
- F15B2211/3056—Assemblies of multiple valves
- F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
- F15B2211/30575—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve in a Wheatstone Bridge arrangement (also half bridges)
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- 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
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- 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
- F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
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- 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
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- 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
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- 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
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- 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
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- 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
- F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid to the return line
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- 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
- F15B2211/5157—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a return line
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- 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
- F15B2211/52—Pressure control characterised by the type of actuation
- F15B2211/528—Pressure control characterised by the type of actuation actuated by fluid pressure
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- 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
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- 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
- F15B2211/625—Accumulators
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- 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
- F15B2211/6306—Electronic controllers using input signals representing a pressure
- F15B2211/6309—Electronic controllers using input signals representing a pressure the pressure being a pressure source supply pressure
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- 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
- F15B2211/6306—Electronic controllers using input signals representing a pressure
- F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
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- 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
- F15B2211/632—Electronic controllers using input signals representing a flow rate
- F15B2211/6326—Electronic controllers using input signals representing a flow rate the flow rate being an output member flow rate
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- 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
- F15B2211/633—Electronic controllers using input signals representing a state of the prime mover, e.g. torque or rotational speed
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- 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
- F15B2211/6333—Electronic controllers using input signals representing a state of the pressure source, e.g. swash plate angle
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- 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
- F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration
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- 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
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- 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
- F15B2211/6656—Closed loop control, i.e. control using feedback
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- 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
- F15B2211/7135—Combinations of output members of different types, e.g. single-acting cylinders with rotary motors
Definitions
- the present invention relates to a construction machine control device suitable for use in a hydraulic excavator, a hydraulic shovel, and the like.
- valve opening is controlled by a hydraulic or electromagnetic hydraulic type pipe valve, and a main control port is remotely controlled to control each valve.
- a main control port is remotely controlled to control each valve.
- the hydraulic oil flow was adjusted for the boom cylinder and the stick cylinder).
- a mouth-sensing single-pump system that enables relatively easy interlocking operation, that is, a closed-center type main control valve connected in parallel (the differential pressure across the valve is constant) And the flow rate is proportional to the opening).
- FIG. Actuyue 502a and 502b will be driven.
- Japanese Patent Application Laid-Open No. 3-255502 discloses an orifice having a main meter separator valve and a pressure compensating valve for setting a differential pressure across these valves. A hydraulic drive control with a sensing system is shown.
- the main control valve for the flow control system is used only for flow control, and it is not considered that only the control valve is used to control the pressure by feedback.
- an unload valve 507 is connected to the hydraulic pump 501, and the discharge pressure of the variable displacement hydraulic pump 501 and the maximum load taken out through the shuttle valve 506 are connected. When the pressure difference from the pressure exceeds a predetermined value, the unload valve 507 opens and the hydraulic oil discharged from the hydraulic pump 501 is returned to the tank. Note that a differential pressure setting panel 507a is provided on the load pressure acting side of the unload valve 507.
- a fixed throttle 508 Downstream of the unload valve 507, a fixed throttle 508 that generates a control pressure according to the hydraulic oil flow rate flowing out of the unload valve 507 is connected.
- the control pressure generated in is detected by the pressure sensor 515.
- the control device for the hydraulic pump 501 is composed of a pump regulator 509, a controller 510, a pressure sensor 515, a displacement sensor 516, and the like.
- the control flow is configured to decrease the discharge flow rate of the hydraulic pump 501 when the control pressure increases, and increase the discharge flow rate when the control pressure decreases.
- a switching valve (lead-off valve) 530 is connected in parallel with the unload valve 507 and at a position upstream of the fixed throttle 508.
- the electromagnetic proportional pressure-reducing valve 531 is controlled by a signal output from the controller 51 in response to an operation signal from the operation lever device 505, and a switching valve is supplied from the pilot hydraulic pressure source 521. Pilot oil pressure to 530 is controlled.
- the opening area of the switching valve 530 is large, and as the operation amount of the operation lever 504 increases, the opening area decreases.
- the switching valve 530 is controlled.
- the load sensing control by the unlock valve 507 and the bleed-off control by the switching valve 530 are selectively executed in accordance with the operation amount of the operation lever device 505, and the characteristics of both controls are controlled. Multiple flow control Can be manifested.
- the required flow rate signal to each of the actuators by the operating means is used as an actuator flow rate setting signal, while the sum of the required flow rates is
- a dis- tribution review is performed by multiplying the required flow rate signal to each of the above factories by a coefficient smaller than 1 to obtain an actuation rate setting signal.
- You may comprise so that it may be provided in a valve control means.
- the operation signal output from the operation system to the main control valve by the distributing operation can accurately determine the distribution of the operating flow required by the operator with respect to the discharge flow of the pump regardless of the load of the operating condition. It is possible to improve the operability, especially the interlocking operability and the fine operability, as well as the operability, so that the operator's skills can be fully demonstrated.
- the coefficient smaller than 1 may be configured to have information obtained by normalizing the working fluid supply flow rate by the sum of the required flow rates.
- the factory setting flow rate setting signal set at the distribution time may be set for each work mode of the construction machine.
- the optimum supply flow rate to each factory is determined according to the operation mode, and the required flow rate distribution to the factory can be accurately realized.
- the detection means is provided with a manifold detection means for detecting an operation state of the valve means, and the valve control means receives a detection result from the manipulation detection means.
- a correction means for correcting the display view function may be provided. WT / JP96 02926 Workability cannot be improved.
- the present invention has been made in view of such a point, and an object of the present invention is to improve operability, ride comfort, and workability of a construction machine.
- the control device for a construction machine includes, in a construction machine, an operating means operated by an operator, a working fluid supply means including a fluid pressure pump driven by a motor, and a working fluid supply means.
- a driving means including a plurality of actuators driven by the working fluid, and a valve provided between the driving means and the working fluid supply means and including a plurality of control valves for controlling the driving means.
- Detecting means including a working fluid supply flow rate detecting means for detecting a working fluid supply flow rate from the working fluid supply means; receiving an operation command from the operating means and a detection result from the detecting means; The required flow rate information for each factory set by the means is compared with the working fluid supply flow rate information from the working fluid supply means.
- Ri by the disk Bokuri Byuta function of determining the supply flow rate suitable is characterized in that it is configured to include a control means including valve control means for controlling the valve means.
- an operation signal from the valve control means having the distributor function is output to a plurality of control valves as a supply flow rate setting command, and each actuator is operated by the fluid pressure from the fluid pressure pump.
- the valve control means compares the required flow rate information for each factory set by the operating means by the distributor function with the information of the working fluid supply flow rate from the working fluid supply means, and according to the comparison result, each factory Since the optimum supply flow rate for one night is determined, the distribution of the required flow rate to the factory
- a check valve for preventing backflow from the accumulator may be interposed in a portion of the working fluid supply path between the connection portion and the connection portion of the accumulator.
- the operating means may be provided with a supply pressure setting device for keeping the pump discharge pressure of the fluid pressure pump constant.
- a supply pressure setting device for keeping the pump discharge pressure of the fluid pressure pump constant.
- An accumulator for storing the working fluid on the discharge side of the fluid pressure pump is provided in the working fluid supplier, and when the sum of the required flow rates is smaller than the working fluid supply flow rate, the operation is performed. In the meantime, the required flow rate signal to each factory is set as an actual flow rate setting signal. If the sum of the required flow rates is larger than the working fluid supply flow rate, the first coefficient smaller than 1 is set to the above.
- the product of the required flow rate signal to each actuator and the flow rate setting signal for the actuator and the sum of the accumulator supply flow rate and the working fluid supply flow rate are regarded as the allowable supply flow rate.
- the first coefficient is configured to have information obtained by normalizing the working fluid supply flow rate by the sum of the required flow rates, and at least one of the first coefficient and the second coefficient is determined by the first coefficient and the second coefficient. It may be configured to be set for each work mode of the construction machine.
- the detection means is provided with a power supply side detection means for detecting an operation state of the working fluid supply means
- the control means is provided with a power supply side detection means.
- the manipulation detection means measures a spool position of the control valve to perform feedback, a load pressure sensor for load sensing which measures load pressure and feeds back, and an actuating device. It may be configured to include a flow rate sensor that measures the flow rate supplied overnight and feeds back the flow rate. With such a configuration, the spool position of the control valve can be accurately controlled.
- an accumulator for storing the working fluid may be provided on the discharge side of the hydraulic pressure pump of the working fluid supply means.
- the working fluid supply means may be provided with an unload valve that bypasses the discharge flow rate of the fluid pressure pump without load when the capacity of the accumulator exceeds a predetermined amount.
- the unload valve is provided in parallel with the working fluid supply passage on the discharge side of the fluid pressure pump, and a portion of the working fluid supply passage downstream of the connection portion of the unload valve.
- the accumulators are provided in parallel with each other, and the unload valve in the working fluid supply path is And a supply pressure setting device provided in the operation means for maintaining a constant pump discharge pressure, and a function device provided from the distribution view device.
- a valve controller for receiving an overnight flow rate setting signal and supplying an operation signal to the main control valve; and a spool provided for each of the halve controllers to measure a spool position of the main control valve and feed back.
- Manipulation-side sensor group engine speed sensor for measuring engine speed
- engine fuel A rack opening sensor for measuring a pump rack opening angle
- a tilt angle sensor for measuring a pump tilt angle
- a discharge pressure sensor for measuring a pump discharge pressure
- a supply pressure sensor for measuring a system supply pressure
- the power supply side sensor group consisting of an accumulator capacity sensor that measures the evening capacity, the deviation between the pressure set by the supply pressure setting device and the feedback signal from the supply pressure sensor, and the sum of the integrated value of the deviation
- First command means for transmitting a tilt angle command signal of the variable displacement hydraulic pump; and a maximum signal of the load sensing load pressure sensor in addition to the supply pressure setting device, If this value continues for a certain period of time or more, a value obtained by adding a certain value to this value is used as a command signal, and the deviation from the feedback signal from the supply pressure sensor and the integration of the deviation
- the power supply side detection means detects a rotation state of the prime mover, an output sensor for detecting an output state of the prime mover, and detects the working fluid pressure from the working fluid supply means. It may be configured to include a working fluid pressure sensor.
- control device for a construction machine is a construction machine, comprising: an operation unit operated by an operation unit; at least one variable displacement hydraulic pump driven by an engine; and the variable displacement hydraulic pump.
- a plurality of hydraulic actuators driven by hydraulic fluid discharged from the hydraulic pump, and a hydraulic pump mounted between the hydraulic actuator and the variable displacement hydraulic pump.
- a plurality of main control valves for controlling a flow rate and a direction to the main body; an accumulator provided in a liquid passage between the variable displacement hydraulic pump and the main control valve for storing a pressurized liquid; It is provided in the fluid path between the displacement hydraulic pump and the main control valve, and when the capacity of the accumulator reaches a maximum, the discharge flow rate of the hydraulic pump is bypassed with no load.
- the required flow signal to the factory is used as it is as the factory setting signal, but if the sum of the required flows is greater than the pump discharge flow, the value obtained by dividing the pump discharge flow by the total required flow First operation means for multiplying the above-mentioned required flow rate signal to each of the above-mentioned factories and outputting it as a factory-day setting flow rate signal; and A value obtained by dividing this by the sum of the required flow rates is multiplied by the required flow rate signal to each of the above factories to obtain a factory setting flow rate signal. It is characterized by comprising means.
- FIG. 1 is a schematic hydraulic circuit diagram showing a main part of a control device for a construction machine as a first embodiment of the present invention.
- FIG. 2 is a schematic block diagram showing the overall configuration of the construction machine control device according to the first embodiment of the tree invention.
- FIG. 3 is a block diagram showing a control system of the manipulation system in the control device of the construction machine as the first embodiment of the present invention.
- FIG. 4 is a diagram showing a modification of the control device for construction machines as the first embodiment of the present invention, and is a diagram showing a data table of coefficients set for each work mode.
- FIG. 5 is a diagram showing another example of a hydraulic circuit applicable to the control device for a construction machine as the first embodiment of the present invention.
- FIG. 6 is a schematic hydraulic circuit diagram of a control device for a construction machine as a second embodiment of the present invention.
- FIG. 7 is a hydraulic circuit diagram showing an example of a hydraulic drive circuit in a conventional construction machine.
- FIG. 8 is a hydraulic circuit diagram showing another example of a hydraulic drive circuit in a conventional construction machine.
- BEST MODE FOR CARRYING OUT THE INVENTION Third command means for transmitting a signal; and an allowable tilt angle command for the variable displacement hydraulic pump within a range of the output of the engine as a function of the output of the engine, the pump discharge pressure, and the efficiency characteristics of the engine and the pump.
- the smallest command signal is selected as a tilt angle command signal for the variable displacement hydraulic pump, and the selected tilt angle command signal and feedback from the tilt angle sensor are provided. It is characterized by comprising a pump controller that positions the pump tilt angle based on the deviation from the signal.
- a hydraulic electronic control system that clarifies the division of functions between hydraulic equipment and electronic control equipment has improved operability.
- the ride comfort and workability can be improved.
- a control device for a construction machine in a construction machine, comprises: an operating means operated by an operation device; a hydraulic pump driven by a prime mover; and a plurality of hydraulic pumps driven by working fluid from the hydraulic pump.
- An actuator a plurality of control valves for controlling the actuator, required flow rate information to each of the actuators set by the operating means, and a working fluid supply from the fluid pressure pump.
- the valve control unit compares the flow rate information with the flow rate information, determines the optimum supply flow rate to each factory according to the comparison result, and controls the valve means. It is.
- the present apparatus is provided with control means for controlling the operations of the actuators 7A and 7B, the hydraulic pump 2, the main control valves 6A and 6B, and the like.
- the operation of the main control valves 6A and 6B is controlled by valve control means 31 provided in the control means.
- the valve control means 31 includes operation levers 3OA and 3OA.
- the information on the required flow rate to each actuator 7B, 7B set by the operation lever 30A, 30B and the hydraulic pump 2 A comparison view with the working fluid supply flow rate information is provided, and a distribution view 31a that determines the optimum supply flow rate to each of the factories 7A and 7B according to the comparison result is provided.
- the sum of the required flow rates of the hydraulic oil to the actuating units 7A and 7B is determined by the operating state of the operating levers 30A and 30B. If the discharge flow rate is smaller than the discharge flow rate, the required flow signal to the actuators 7A and 7B by the operation lever 3OA and 30B is output as it is as the flow rate setting signal for the actuator and the sum of the required flow rates Is greater than the pump discharge flow rate, the value obtained by dividing the pump discharge flow rate by the sum of the required flow rates (a ⁇ 1: the first coefficient) is multiplied by the required flow rate for each factor 7 A, 7 mm, and the result is obtained. The required flow rate is newly set as the required hydraulic oil quantity, and this required flow rate signal is output as a factory setting flow rate signal.
- the total of the accumulated pressure supply flow rate of the accumulator 5 and the discharge flow rate from the hydraulic pump 2 was defined as the allowable supply flow rate, and this value was divided by the sum of the required flow rates / S. Multiplies the required flow rate to 7A and 7B and sets the resulting value as the new required hydraulic oil quantity
- this equipment includes a diesel engine (hereinafter simply referred to as an engine) 1 as a prime mover and a variable displacement hydraulic pump (hereinafter referred to as a hydraulic pump) driven by the engine 1.
- a hydraulic pump 2) and a plurality of hydraulic actuators 7A and 7B driven by high-pressure hydraulic fluid discharged from the hydraulic pump 2 are provided.
- a plurality of main control valves (closed center valves) 6A and 6B are provided between the hydraulic pump 2 and the hydraulic actuators 7A and 7B, and are operated by an operator.
- An operation command signal from the system controls the direction and flow rate of hydraulic oil supplied to hydraulic actuators 7A and 7B.
- the actuators 7A and 7B operate according to the operating state of the operating levers 3OA and 30B as operating means.
- flow rate sensors 106A and 106B with check valves are provided on the upstream side of the main control valves 6A and 6B.
- an unload valve 3 that bypasses the hydraulic oil discharged from the hydraulic pump 2 to the hydraulic tank 9 with no load, and a hydraulic pump 2 And an accumulator 5 for accumulating hydraulic oil discharged from the compressor.
- the working fluid supply passage (oil passage) on the discharge side of the hydraulic pump 2 is branched in two directions on the downstream side, and the unload valve 3 is connected to one oil passage.
- the other oil path is provided with an accumulator 5 via a check valve 4.
- the check valve 4 is for preventing the hydraulic oil from the accumulator 5 from flowing back.
- Power supply side detection means or a power supply side sensor group comprising an accumulator capacity sensor 105 to be measured is provided.
- the control means of the present apparatus is provided with a power supply side control means (pump controller) 26.
- the pump controller 26 has a first command means a, a second command means b, and a third command means.
- Command means c, fourth command means d and fifth command means e are provided.
- the pump controller 26 selects the smallest signal among the signals transmitted from the above-mentioned command means a, b, d, and e, and sets the selected signal as the tilt angle command signal of the hydraulic pump 2. It has a function of positioning the pump tilt angle based on the deviation between the tilt angle command signal and the feedback signal from the tilt angle sensor 103 of the hydraulic pump 2.
- the first command means a is a deviation between the pressure set by the supply pressure setter 20 and the feedback signal from the supply pressure sensor 104.
- This is a means for transmitting the tilt angle command signal ⁇ ⁇ of the variable displacement hydraulic pump 2 based on the sum of the integral values of and ⁇ , and has a function as a controller.
- the second command means b is an A port load pressure sensor for load sensing of the main control valves 6 A and 6 B in addition to the supplied pressure setting device 20 and load ports 108 A, 108 B and B ports.
- the signal P l max having the maximum load information is selected from the load information detected by the load pressure sensors 109 A and 109 B, and this value continues for a certain period of time.
- the value obtained by adding the constant value P10 is used as a command signal, and the deviation from the feedback signal from the supply pressure sensor 104 and the sum of the integrated value of the deviation are used as the tilt angle command signal O for the variable displacement hydraulic pump 2
- the second command means b also has a function as a ⁇ 1 controller.
- the third command means c increases the supply pressure to a certain value that is larger than the set value. 97 1 Then, this required flow rate signal is output as an actual flow rate setting signal.
- the present apparatus is provided with a supply pressure setting device 20 for keeping the discharge pressure of the hydraulic pump 2 constant.
- main control valves 6 A and 6 B are provided with spool position sensors 107 A and 107 B for detecting the spool position (ie, the valve opening).
- Valve controller (compensation means) that outputs an operation signal to, 6B.
- a feedback system for spool position, a load pressure feedback system with bandpass filter, and A flow feedback system is provided. That is, a flow sensor with a check valve 106A, 106B that measures the flow rate supplied to each actuator 7A, 7B and feeds back (or an actuator speed sensor or a position sensor may be used). ), Spool position sensor 107A, 107B that measures the spool position (valve opening) of main control valve 6A, 6B and feeds it back.
- A-port load pressure sensors for load sensing with a band-pass filter 200 (see FIG. 3) that measures the load pressure and feeds back the load.
- Port load sensors 108 A, 108 B, and B load Manipulation detection means (or manipulation side sensor group) consisting of pressure sensors 109A and 109B are provided.
- a rack opening sensor (output sensor) 100 that measures the rack opening of the fuel pump of engine 1
- an engine speed sensor (rotation state sensor) 101 that measures the engine 1 speed
- hydraulic pressure Pump discharge pressure sensor working fluid pressure sensor
- pump displacement angle sensor 103 for measuring the displacement angle of hydraulic pump 2
- supply pressure from check valve 4 Supply pressure sensor 104 measures accumulator capacity It consists of a controller 23, a minimum signal selector 24 and a pump tilt angle regulator 25.
- the pump controller 26 controls the hydraulic pump 2 to supply the supply pressure corresponding to the loads 8 mm and 8 mm, similarly to the engine 1, but the supply pressure signal is supplied to the supply pressure setting device 20. And is output to the supply pressure controller 21 for the pump 2 and the unload valve 5. That is, the supply pressure controller 21 uses the sum of the deviation and the integral value of the deviation between the pressure set by the supply pressure setting device 20 and the feedback signal from the supply pressure sensor 104 to ( ⁇ I control) Set the tilt angle command signal ⁇ ⁇ of the Ml pressure pump 2 (first command means a).
- the supply pressure controller 21 selects the maximum signal P l raax among the load pressure sensors 1 08 A, 1 08 B, 1 09 A, and 1 09 B for load sensing and sets this value. If a certain period of time continues for a certain period of time, a value obtained by adding a certain value P10 to this value is set, and the pressure set by the supply pressure setting unit 20 and the feedback from the supply pressure sensor 104 are set. Using the deviation from the signal and the sum of the integral of the deviation (PI control), the tilt angle command signal ⁇ s of the hydraulic pump 2 is set (second command means b).
- the supply pressure controller 21 in addition to the tilt angle operation algorithm of the hydraulic pump 2, when the supply pressure rises to a certain value larger than the set value and the accumulator capacity is near the maximum value. If the unload valve 3 is opened to bypass the variable displacement pump flow rate with no load, and if the supply pressure drops below a certain value from the set value or if the accumulator capacity is near the minimum value, It has an unload valve operation algorithm that closes the unload valve 3 (third command means c).
- the check valve 4 prevents the high-pressure hydraulic oil from flowing backward from the accumulator 5 when the hydraulic pump 2 is in the unloaded state.
- the accumulator capacity is close to the maximum and the unload valve 3 is opened, the discharge flow rate of the hydraulic pump 2 is bypassed with no load, and the supply pressure falls below a certain value smaller than the set value. This is a means to send a signal to close the unload valve 3 when the accumulator capacity is near the minimum.
- the fourth command means d is an allowable tilt angle of the hydraulic pump 2 within the range of the output of the engine 1 as a function of three parameters of the output of the engine 1, the discharge pressure of the hydraulic pump 2 and the efficiency characteristics of the engine pump. This is a means for transmitting the command signal ⁇ 11.
- the fifth command means e is a means for transmitting a tilt angle command signal ⁇ ⁇ of the hydraulic pump 2 in order to secure a pump flow rate proportional to the flow rate demand of the operator.
- this device focuses on its functions, and it has an operation system operated by an operator of a construction machine, a power supply system for supplying hydraulic pressure, and a manipulator for controlling hydraulic pressure. These can be roughly classified into one-shot systems, and each of them will be described below using FIG. 1 and FIG.
- the engine speed corresponding to the loads 8 A and 8 B is set by the engine throttle 10. That is, the engine speed controller 11 outputs a command signal corresponding to the opening of the engine throttle 10, a feedback signal from the engine speed sensor 101, and a fuel pump rack opening sensor. The rack opening of the fuel pump is determined by the feedback signal from the engine 100, and the engine speed is automatically set.
- the power supply-side control means (pump controller) 26 is composed of a supply pressure controller 21, an engine port limiter 22, and a pump flow controller. This outputs the factory setting flow rate setting signal Qsa, Qsb,.... Note that the actuate overnight flow request signals Qra, Qrb,... Are signals that are set independently of each other, and are supplied to each actuator overnight 7A, 7B depending on the required flow amount of the signal. Hydraulic oil priority is set.
- the engine load limiter 22 replaces the conventional power mode selector.
- the pump capacity, the output Ne of the engine speed sensor 101, the output Pp of the pump discharge pressure sensor 102, the engine pump, and the engine pump The allowable tilt angle command signal ⁇ 11 of the variable displacement hydraulic pump 2 is set within the range of the engine output as a function of the efficiency characteristic of the engine (fourth command means d).
- the pump flow controller 23 is the same as the conventional positive flow control, and outputs the tilt ft command signal ⁇ of the hydraulic pump 2 in order to secure a pump flow proportional to the flow demand of the operator.
- the pump controller 26 can be regarded as one of the preceding signals (feedforward) (fifth command means e).
- a signal for setting the pump tilt angle to the minimum is selected from the pump tilt angle command signals ⁇ , Opls, ⁇ 11, Of transmitted from the above-described means. .
- the pump tilt angle regulator 25 receives the output signal from the minimum signal selector 24 as an input signal, and determines the tilt angle of the hydraulic pump 2 by the feedback signal from the pump tilt angle sensor 103. .
- this power supply system is configured as a power supply system having a so-called mouth-to-pass system characteristic with a large energy storage to secure the supply pressure to the manipulation system described later. is there.
- the distribution function 31 a serving as the valve control means includes an actuating flow rate request signal Qra, QRb, from the operation levers (operation means) 3 OA, 30 B (only two are shown here). When « is input, it goes to the knob controller 32 A, 32 B,... depending on the status of the power supply system.
- the valve control system drives the greatly fluctuating mass loads 8 A and 8 B, so there are many resonance and anti-resonance points, and especially low-frequency driving phenomena degrade ride comfort.
- this system is a dynamic pressure feedback system.
- the main control valve (three-stage amplification type main control valve) 6 A has a spool position (spool opening) signal X ca that is proportional to the input current value X ci to the main control valve servo valve. Since this signal is obtained from the spool position sensor 107 A, this signal X ca is fed back to the valve control port 32 A, the spool of the main control valve 6 A is positioned, and the flow rate of the actuator is set. A signal Q saa equal to the signal Q sa can be obtained automatically.
- This system is an automatic flow control type servo mechanism that replaces the conventional manual flow control of each actuator 7A, 7B, which can improve responsiveness, safety and flow accuracy. is there. ) Can be realized accurately, operability is significantly improved, and workability is improved.
- this manipulation system is characterized by high response of the main control valves 6A and 6B All the pressure fluctuations are controlled electronically by one main control valve to control the operation of the load drive hydraulic actuators 7A and 7B.
- a single-function hydraulic control valve is Eliminate as much as possible, clarify individual / system functions and improve accuracy. ⁇ Improve reliability.
- the complicated operation lever 30A, 3 at the time of the interlocking operation that the operator has conventionally operated and adjusted based on his / her own experience.
- the flow distribution by the operation of 0B and the control of the hydraulic pump 2 can be set to the operator's preference according to the work content. In other words, priority can be given to the operations of each actuator 7A and 7B according to the work content.
- the operator can operate the operating levers 3 OA and 30 B and operate the operation levers 3 OA and 30 B while focusing on the load status of the work equipment. Therefore, accurate flow control can be performed automatically.
- the operation of the valve control system will be described with reference to FIG. 3 focusing on Actuate Ichiyu (hydraulic cylinder) 7A.
- the factory setting flow rate output signal Qsa output from the distribution view 31a is input to the valve controller 32A.
- the flow signal Q saa to the factory is fed back by the flow sensor 106 A with a check valve.
- the bias between signal Q sa and signal Q saa If the coefficient ⁇ and the second coefficient /? Are individually set for each factory, the priority of each factory can be made clearer, and workability is improved. In other words, depending on the work mode (ie, the work mode), the required value of the flow rate Qra, Qrb,...
- the factor ⁇ (or / 3) to be multiplied with the required flow rates Qra and Qrb is changed according to the type of operation and the type of work (that is, work mode).
- the correction coefficient k ij which is individually set every night is multiplied.
- a data table as shown in FIG. 4 is set in the distribution view 31a, and the data table is set by the work number i and the work mode number j.
- the correction coefficients kij are stored in a table.
- the work mode is a work mode arbitrarily set by the operator.
- FIG. 1 is configured substantially in the same manner as the above-described first embodiment.
- a description will be given mainly of parts different from the first embodiment.
- the setting is performed by the distributor 31a.
- the configuration signals Qsa and Qsb are set for each construction machine work mode (eg, excavation work mode, house demolishing work mode, etc.). That is, in the case of the above-described first embodiment, when the sum total of the required flow rates of the hydraulic levers 7A, 7B,... By the operation levers 30A, 30B,. Calculate the 1st coefficient ⁇ by [Pump discharge flow rate] / [Total of required flow rate] and calculate the 1st coefficient
- the coefficients (first coefficient ⁇ , second coefficient ⁇ ) for multiplying... are the same values for all factor units 7 ⁇ and 7 ⁇ . That is, in the above case (1), the first coefficient ⁇ is multiplied uniformly for both Qra and Qrb, and in the case (2), the first coefficient ⁇ is uniformly set for both Qra and Qrb. The second coefficient is multiplied.
- the correction coefficient k ij for multiplying the first coefficient ⁇ and the second coefficient is set to the same value, but this correction coefficient kij is set to the first coefficient ⁇ and the second coefficient 3 May be set to ⁇ .
- one three-way solenoid valve is used for one actuator as the main control valve, and the hydraulic control is performed by controlling the operation of the three-way solenoid valve.
- the present invention is not limited to such a configuration.
- the hydraulic oil supply to the actuator 200 and the hydraulic oil discharge from the actuator 210 are controlled independently. Separate control valve means as described above may be provided.
- the separation control type valve means as shown in FIG. 5 focuses on the operation responsiveness of the actuator 200, and the independently provided electromagnetic valves 201 to 204 are used. By controlling each of them, the supply and discharge of hydraulic oil can be performed quickly and accurately.
- 205 is a speed sensor
- 207 is a hydraulic actuator
- 208 is a hydraulic sensor
- 210, 221 is a valve position sensor
- 211, 213 is a check. It is a valve (check valve).
- a control signal to each of the electromagnetic valves 201 to 204 is set by control means (not shown) based on the detection information from each of the sensors 205 and 208 to 211.
- the switching state of each of the solenoid valves 201 to 204 is controlled.
- the factory setting flow rate setting signals Qsa and Qsb set in the distribution view 31a are corrected individually for each of the construction machine work mode and the setting mode.
- the coefficient k ij By setting using the coefficient k ij, it is possible to realize the distribution of the flow rate of the actuator suitable for the operation mode of the construction machine.
- the actuator overnight flow request signals Qra, Qrb,... are signals that are set independently of each other, and the operation supplied to each actuator 7A, 7B depends on the required flow rate of this signal. Oil priority is set.
- the complex operation levers 30A and 30B at the time of the interlocking operation which the operator has conventionally operated and adjusted based on his own experience, are provided.
- the flow distribution by operation and the control of the hydraulic pump 2 can be set to the operator's preference according to the work content. In other words, it is possible to give priority to the operation of each actor A, 7B according to the work content.
- the operator can operate the operating levers 30A and 30B to control the load 8A and 8B by simply operating the operating levers 30A and 30B, while focusing on grasping the load condition of the work equipment.
- Automatic, accurate flow control As the two-way solenoid valves 201 to 204, spool-type solenoid valves with excellent response and stability are used. As the solenoid valves 201 to 204, a highly liquid-tight port valve type can be considered, and stable response is obtained in consideration of the operation response of the actuators. It can be said that the solenoid valve of the spool evening is more suitable.
- the second embodiment is different from the first embodiment in that the accumulator 5 is mainly omitted as shown in FIG.
- the configuration is the same as that of the embodiment.
- the operation levers 3 OA and 30 B Evening The required flow signal to 7A and 7B is output as it is as the actuator flow rate setting signal. If the total required flow is larger than the pump discharge flow, divide the pump discharge flow by the total required flow. Is multiplied by the required flow rate of each actuator 7 ⁇ , 7 ⁇ , and the resulting value is newly set as the required hydraulic oil flow rate. It is output as a factory setting signal.
- the distribution function 31a which functions as the valve control means, is used for requesting the flow rate from the operation lever (operation means) 30A, 30B. Since a signal Xca of the spool position (spool opening) proportional to Xci is obtained from the spool position sensor 107 A, this signal Xca is fed back to the valve controller 32 A, and the Positioning the spool at the inlet port and valve 6A, it is possible to automatically obtain a signal Qsaa that is equal to the actual flow rate setting signal Qsa.
- the operator can control and adjust the flow rate and control the hydraulic pump 2 by operating the complicated operation levers 30 A and 30 B during the interlocking operation, which has been conventionally operated and adjusted by the operator based on his own experience. It is possible to set the operator's preference according to the work content. In other words, it is possible to give priority to the operation of each factor 7A and 7B according to the work content.
- valve control system will be described. This is also the same as that described in the first embodiment.
- the actuating unit flow rate setting signal Qsa output from the distribution unit 31 a is transmitted to the valve controller 32. Enter A.
- the flow sensor 106A feeds back the flow signal Qsaa to the factory 7A.
- a signal (/ control signal) obtained by multiplying the deviation signal between the signal Q sa and the signal Q saa by a constant K p and the integral value of the deviation signal between the signal Q sa and the signal Q saa are each multiplied by a constant 1 / T.
- the signal (I control signal) obtained by the above is added to the signal F (Q sa) which is a feedforward signal of the signal Q sa.
- the differential pressure across the main control valve 6 A Ps — Plla or Ps-P12a
- the flow rate of the main control valve 6 A may be obtained from the output X ca or the like.
- the valve control system drives the largely fluctuating mass loads 8A and 8B, so that many resonances occur.
- the signal P 12a from the 6 A load B pressure sensor 109 A is fed back to the valve controller 32 A through the band pass filter 200. That is, it can be said that this method is also a dynamic pressure feedback method.
- i is a number that indicates the number of accidents.
- the construction machine is a hydraulic excavator
- the factory setting flow rate setting signals Qsa and Qsb set in the distribution view 31a are corrected individually for each of the construction machine work mode and the setting mode.
- the coefficient k ij it is possible to realize the distribution of the flow rate of the factories suitable for the construction machine work mode.
- the coefficient ⁇ to be multiplied with the required flow rate Qra, Qrb, « to each of the factories 7A and 7B is the same value for all factories 7 ⁇ and 7 ⁇ . That is, the coefficient ⁇ is multiplied uniformly for both Qra and Qrb.
- the coefficient ⁇ to be multiplied to the required flow rates Qra and Qrb is further changed according to the type of work and the work mode (ie, work mode).
- the correction coefficient k ij which is individually set every night is multiplied.
- a data table as shown in FIG. 4 is also set in the distribution table 31a, and this data table is set by the actual work number i and the work mode number j.
- the correction coefficients k ij are stored in a table.
- Driving means including a plurality of actuators (7A, 7B) driven by the working fluid from the working fluid supply means;
- Valve means provided between the driving means and the working fluid supply means and including a plurality of control valves (6A, 6B) for controlling the driving means; and actuation from the working fluid supply means Detecting means including a working fluid supply flow rate detecting means (102) for detecting a fluid supply flow rate;
- the setting is made by the operating means (30A, 30B).
- the required flow rate information (Qra, Qrb) to each of the above actuators (7A, 7B). Is compared with the working fluid supply flow rate information from the working fluid supply means.
- the control function including the valve control means (31) for controlling the valve means is provided by the display function for determining the optimal supply flow rate to the one (7A, 7B).
- a control device for a construction machine comprising:
- a plurality of two-way solenoid valves 201-200 are used instead of the control valves 6A and 6B. It may be configured using the separation control type valve means according to 4. With this configuration, the supply of hydraulic oil to the actuator 210 and the discharge of hydraulic oil from the actuator 207 can be controlled independently.
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Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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KR1019970703731A KR100212771B1 (ko) | 1995-10-09 | 1996-10-08 | 기계 구성체의 제어 장치 |
JP51067197A JP3677296B2 (ja) | 1995-10-09 | 1996-10-08 | 建設機械の制御装置 |
EP96932847A EP0796952A4 (en) | 1995-10-09 | 1996-10-08 | CONTROL DEVICE FOR A CONSTRUCTION MACHINE |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP7/261869 | 1995-10-09 | ||
JP26186995 | 1995-10-09 |
Publications (1)
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WO1997013929A1 true WO1997013929A1 (fr) | 1997-04-17 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP1996/002926 WO1997013929A1 (fr) | 1995-10-09 | 1996-10-08 | Systeme de commande d'engins de chantier |
Country Status (6)
Country | Link |
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EP (1) | EP0796952A4 (ja) |
JP (1) | JP3677296B2 (ja) |
KR (1) | KR100212771B1 (ja) |
CN (1) | CN1166192A (ja) |
CA (1) | CA2201626A1 (ja) |
WO (1) | WO1997013929A1 (ja) |
Cited By (3)
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WO2004007973A1 (ja) * | 2002-07-11 | 2004-01-22 | Nabtesco Corporation | 電気流体圧アクチュエーションシステム |
JP2004270924A (ja) * | 2002-09-25 | 2004-09-30 | Husco Internatl Inc | 速度に基づく制御システムの複数の油圧機能部間で流量を配分する方法 |
JP2007247230A (ja) * | 2006-03-15 | 2007-09-27 | Kobelco Contstruction Machinery Ltd | ハイブリッド建設機械 |
Families Citing this family (29)
Publication number | Priority date | Publication date | Assignee | Title |
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JP3511453B2 (ja) * | 1997-10-08 | 2004-03-29 | 日立建機株式会社 | 油圧建設機械の原動機と油圧ポンプの制御装置 |
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- 1996-10-08 WO PCT/JP1996/002926 patent/WO1997013929A1/ja not_active Application Discontinuation
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- 1996-10-08 KR KR1019970703731A patent/KR100212771B1/ko not_active IP Right Cessation
- 1996-10-08 CN CN96191191A patent/CN1166192A/zh active Pending
- 1996-10-08 EP EP96932847A patent/EP0796952A4/en not_active Withdrawn
- 1996-10-08 JP JP51067197A patent/JP3677296B2/ja not_active Expired - Fee Related
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WO2004007973A1 (ja) * | 2002-07-11 | 2004-01-22 | Nabtesco Corporation | 電気流体圧アクチュエーションシステム |
JP2004270924A (ja) * | 2002-09-25 | 2004-09-30 | Husco Internatl Inc | 速度に基づく制御システムの複数の油圧機能部間で流量を配分する方法 |
JP2007247230A (ja) * | 2006-03-15 | 2007-09-27 | Kobelco Contstruction Machinery Ltd | ハイブリッド建設機械 |
JP4524679B2 (ja) * | 2006-03-15 | 2010-08-18 | コベルコ建機株式会社 | ハイブリッド建設機械 |
Also Published As
Publication number | Publication date |
---|---|
KR100212771B1 (ko) | 1999-08-02 |
CA2201626A1 (en) | 1997-04-09 |
EP0796952A1 (en) | 1997-09-24 |
EP0796952A4 (en) | 2000-01-19 |
KR980700495A (ko) | 1998-03-30 |
CN1166192A (zh) | 1997-11-26 |
JP3677296B2 (ja) | 2005-07-27 |
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