CN106438584A - Motor speed regulation based variable-pressure variable-displacement type hydraulic servo mechanism and working method - Google Patents
Motor speed regulation based variable-pressure variable-displacement type hydraulic servo mechanism and working method Download PDFInfo
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- CN106438584A CN106438584A CN201610849277.0A CN201610849277A CN106438584A CN 106438584 A CN106438584 A CN 106438584A CN 201610849277 A CN201610849277 A CN 201610849277A CN 106438584 A CN106438584 A CN 106438584A
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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
- F15B21/02—Servomotor systems with programme control derived from a store or timing device; Control devices therefor
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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
- F15B2211/25—Pressure control functions
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- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to a motor speed regulation based variable-pressure variable-displacement type hydraulic servo mechanism and a working method. The servo mechanism comprises a controller, an oil filter, a position sensor, a brushless direct-current motor, a constant displacement pump, a pressure increase piston, a servo valve and an oil cylinder. The controller receives position signals and controls action of the servo valve, and meanwhile the constant displacement pump is driven by a control motor to control movement of a piston of the oil cylinder. According to the servo mechanism and the working method, according to the external force borne by the oil cylinder, the system pressure is adjusted dynamically, and therefore when working, the servo mechanism is in a low-pressure working state for a long time, and leakage can be reduced easily. The power consumption of the servo mechanism can be directly reduced through the low system pressure. The servo mechanism is composed of cheap electronic components and achieved through the controller with embedded software, and the cost can be reduced.
Description
Technical field
The present invention relates to hydraulic servomechanism, more particularly, to a kind of variable pressure and flow type hydraulic servo-machine based on electric machine speed regulation
Structure and method of work.
Background technology
Hydraulic servomechanism belongs to one kind of Positioning Servo System, is widely used in mechanical industry, Aero-Space etc.
In field, need the wider occasion of high-power, big power output, big output torque, speed adjustable range.Have that power is big, electrodeless variable-speed,
The advantages of respond fast.
It is several big that general hydraulic servomechanism includes hydraulic energy source, start (hydraulic cylinder or hydraulic motor), position detection etc.
Part, exist complex structure, volume is big, efficiency is low, easily reveal the problems such as, volume weight, efficiency etc. are required strict
The application of occasion is extremely restricted.
Current hydraulic servomechanism, except indivedual mechanisms only needing simple start use pump control cylinder scheme, generally uses
Valve-controlled cylinder, to obtaining more preferable controllability, its hydraulic energy source generally uses constant pressure variable displacement pump or dosing pump, constant pressure variable displacement pump
Shortcoming be that high cost, volume be larger, the life-span is shorter, the shortcoming of dosing pump is that pressure can not be adjusted, and can only use overflow
The additional valve member such as valve, pressure regulator valve is realized, and leads to efficiency low；Simultaneously as system pressure is higher, easily cause hydraulic pressure oil seepage,
Lead to the pollution to environment, these shortcomings limit the hydraulic servomechanism of routine strict to space weight, efficiency requirements
The application of occasion.
Therefore reduce the system energy consumption of hydraulic servomechanism and the method for overall volume, weight in the urgent need to effective.
Content of the invention
A kind of in view of above-mentioned analysis, the present invention is intended to provide variable pressure and flow type hydraulic servomechanism based on electric machine speed regulation
And method of work, in order to solve problems of the prior art.
The purpose of the present invention is mainly achieved through the following technical solutions：
Based on the one side of the embodiment of the present invention, embodiments provide a kind of change buckling based on electric machine speed regulation
Amount type hydraulic servomechanism, including controller, oily filter, position sensor, brushless direct current motor, dosing pump, charged piston, watches
Take valve and oil cylinder；
Wherein, controller is connected with position sensor and servo valve respectively, and position sensor is connected with cylinder piston rod, control
In device processed, motor-drive circuit is connected with brushless direct current motor, and motor is mechanically connected with dosing pump, and oil filter is arranged on dosing pump
Delivery outlet, charged piston is connected with low pressure oil way, and servo valve forms valve-controlled cylinder system with oil cylinder.
Based in an alternative embodiment of the invention, in valve-controlled cylinder system, the delivery outlet through described servo valve for the pressure oil
Enter oil cylinder, promote cylinder piston rod to make straight-line displacement.
Based in an alternative embodiment of the invention, position sensor is connected with described cylinder piston rod, obtains oil cylinder
The position signalling of piston rod, is transferred to described controller.
Based in an alternative embodiment of the invention, also include overflow valve, described overflow valve is used for when system pressure liter
Make excess traffic be back to low pressure oil way when up to exceeding design load, specifically include end cap, O-ring, valve body, cone valve, spring, spiral shell
Stifled.
Based on the other side of the embodiment of the present invention, embodiments provide a kind of variable pressure and flow of electric machine speed regulation
The method of work of type hydraulic servomechanism, comprises the following steps：
S1, system initialization is carried out to servo control mechanism；
The oil cylinder that the extraneous target location command signal providing receiving and position sensor obtain is lived by S2, controller
The difference of the current position signal of stopper rod is converted to servo valve control electric current, controls servo valve work；Controller is according to by mistake simultaneously
Difference signal, controlled motor rotating speed, control quantitative POF change further, thus adjusting system pressure；Oil cylinder is driven to live
Stopper rod；
S3, to the controller new target position signal of input, described controller is according to new target position signal and position
The difference of the position signalling of sensor cylinder piston rod, controls servo valve and Motor drive cylinder piston rod again；
S4, circulation execution above-mentioned steps S2 to S3, make cylinder piston rod move back and forth.
Based in an alternative embodiment of the invention, step S2 further includes：
S21, controller control servo valve and Motor drive oil according to the position of cylinder piston rod and the difference of target location
Cylinder piston rod accelerates target location described in movement velocity fast approaching；
S22, controller control servo valve and motor further according to the position of cylinder piston rod and the difference of target location
Cylinder piston rod is driven to slow down until stablizing in described target location.
Based in an alternative embodiment of the invention, step S3 further includes：
S31, controller control servo valve and motor to drive according to the position of cylinder piston rod and the difference of new target location
Dynamic cylinder piston rod accelerates new target location described in movement velocity fast approaching；
S32, controller according to the position of cylinder piston rod and the difference of new target location control further servo valve with
Motor drive cylinder piston rod slows down until stablizing in described new target location.
Based in an alternative embodiment of the invention, step S21 further includes：
S211, the servo valve control current control servo valve start of described controller output, output flow increases, hydraulic oil
Flow into oil cylinder from the delivery outlet of servo valve, promote cylinder piston rod motion；
S212, described controller improve rotating speed according to embedded control strategy, motor, and quantitative POF adds
Greatly, improve system pressure, make described cylinder piston rod position fast approaching target location.
Based in an alternative embodiment of the invention, step S22 further includes：
S221, the servo valve control servo valve start of described controller output, output flow diminishes, until being zero, oil cylinder
Output speed reduce, until stable in target location；
The control strategy controlled motor that S222, described controller embed reduces rotating speed, and quantitative POF declines, system
Pressure declines therewith, until cylinder piston rod can be maintained static；
The control strategy controlled motor rotating speed that S223, described controller embed maintains certain numerical value, so that dosing pump is exported
Flow is equal to servo valve internal hemorrhage due to trauma flow.
Based in an alternative embodiment of the invention, also include：
When described controller drives described motor to rotate with maximum speed, described quantitative POF reaches maximum
Value, the excess traffic outside oil cylinder start needs, make system pressure rise to over design load, overflow valve is opened, excess traffic
Low pressure oil way is back to by overflow valve, system pressure falls after rise, maintains design load.
The present invention has the beneficial effect that：
1. reduce seepage:External force according to suffered by oil cylinder, dynamic adjusting system pressure, when so that servo control mechanism is worked, for a long time
It is in operating on low voltage state, advantageously reduce seepage.
2. reduce power consumption:Relatively low system pressure can directly reduce the power consumption of servo control mechanism.
3. reduces cost:The function that the hydraulic component of costliness is realized is needed, using less expensive in conventional servo mechanism
Electronic devices and components composition, the controller of embedded software are realized, can be with reduces cost.
Other features and advantages of the present invention will illustrate in the following description, and, partial becoming from description
Obtain it is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages can be by the explanations write
In book, claims and accompanying drawing, specifically noted structure is realizing and to obtain.
Brief description
Accompanying drawing is only used for illustrating the purpose of specific embodiment, and is not considered as limitation of the present invention, in whole accompanying drawing
In, identical reference markss represent identical part.Fig. 1 is a kind of variable pressure and flow type hydraulic servomechanism servo of electric machine speed regulation
The structural representation of mechanism；
Fig. 2 is overflow valve composition schematic diagram；
Fig. 3 is a kind of flow chart of work methods of the variable pressure and flow type hydraulic servomechanism servo control mechanism of electric machine speed regulation.
Reference：
101- controller, 102- oil filter, 103- position sensor, 104- brushless direct current motor, 105- dosing pump, 106-
Overflow valve, 107- charged piston, 108- servo valve, 109- oil cylinder；
201- end cap, 202-O type circle, 203- valve element, 204-O type circle, 205- valve body, 206- cone valve, 207- spring, 208-
Screw plug.
Specific embodiment
To specifically describe the preferred embodiments of the present invention below in conjunction with the accompanying drawings, wherein, accompanying drawing constitutes the application part, and
It is used for together with embodiments of the present invention explaining the principle of the present invention.
According to a specific embodiment of the present invention, disclose a kind of variable pressure and flow type hydraulic servo based on electric machine speed regulation
Mechanism, including controller, oily filter, position sensor, brushless direct current motor, dosing pump, overflow valve, charged piston, servo valve
And oil cylinder；
Wherein, controller is connected with position sensor and servo valve respectively, and position sensor is connected with cylinder piston rod, control
In device processed, motor-drive circuit is connected with brushless direct current motor, and motor is mechanically connected with dosing pump, and oil filter is arranged on dosing pump
Delivery outlet, overflow valve is arranged on oil duct near dosing pump delivery outlet position, and charged piston is connected with low pressure oil way, servo valve with oil
Cylinder constitutes a valve-controlled cylinder system, and in valve-controlled cylinder system, pressure oil is through entering described oil cylinder, oil at servo valve valve pocket opening
Pressure promotes described oil cylinder piston to make straight-line displacement.
Specifically, wherein servo valve is 3-position 4-way type servo valve, and oil cylinder is bi-directional symmetrical oil cylinder, and A, B of servo valve are defeated
Outlet is connected with oil cylinder two ends respectively.
Overflow valve, as shown in Fig. 2 including end cap, O-ring, valve body, cone valve, spring, screw plug, by rotating screw plug, is adjusted
The decrement of spring, arranges preset earial drainage pressure.The design maximum vent flow of overflow valve is slightly below dosing pump maximum output stream
Amount.When system pressure is too high, overflow valve is opened, and hydraulic oil is leaked to low pressure oil way；Otherwise turn off.Specifically, when A cavity pressure is big
When rating system pressure Ps, overflow valve is opened, and hydraulic oil leaks to B chamber, and after system pressure is decreased below Ps, overflow valve closes
Disconnected.
Dosing pump allowable stress is for more than 1.5 times of rating system pressure of design it is ensured that in system pressure suddenly rising
When overflow valve is not yet turned on, will not breakage because of impact in the structure of dosing pump.
Wherein, oil filter is arranged on dosing pump delivery outlet, is used for avoiding fifth wheel to enter high-pressure oil passage；
Wherein, charged piston is connected with low pressure oil way, by spring pre-pressing force, makes low pressure oil way produce certain pressure
Power, meets dosing pump oil suction requirement；
Rated operating pressure Ps of servo valveNEqual to rating system pressure.Meanwhile, this programme must obtain servo valve reliability
Operating pressure Ps1Parameter, as system minimum pressure design load.
Servo valve and oil cylinder constitute a valve-controlled cylinder system, and specifically, wherein servo valve is 3-position 4-way type servo valve,
Oil cylinder is bi-directional symmetrical oil cylinder, and A, B delivery outlet of servo valve is connected with oil cylinder two ends respectively, and servo control mechanism feeds back for position closed loop
System, job step is as follows：
S1, system initialization is carried out to servo control mechanism.
The oil cylinder that the extraneous target location command signal providing receiving and position sensor obtain is lived by S2, controller
The difference of the current position signal of stopper rod is converted to servo valve control electric current, controls servo valve work；Controller is according to by mistake simultaneously
Difference signal, controlled motor rotating speed, control quantitative POF change further, thus adjusting system pressure；Oil cylinder is driven to live
Stopper rod.
Further, the oil that the extraneous target location command signal providing receiving and position sensor are obtained by controller
The difference of the current position signal of cylinder piston rod is first amplified before conversion.
Specifically, using classical PID algorithm, calculate motor control pwm signal dutycycle, motor-drive circuit according to
Pwm signal dutycycle motor rotates by certain rotating speed rotation；Motor speed changes and controls quantitative POF change,
Thus adjusting system pressure；Specifically, the change of motor speed, makes quantitative POF change, so that system pressure liter
Height or reduction, provide hydraulic energy source for valve-controlled cylinder.
S21, controller control servo valve and controlled motor to drive according to the position of cylinder piston rod and the difference of target location
Dynamic cylinder piston rod accelerates movement velocity fast approaching target location.
The start of control cylinder based on servo valve, between target position signal and current position signal, error is larger,
Typically exceeding when system allows more than site error twice it is meant that resistance suffered by oil cylinder is larger or outgoing position is away from target position
Put farther out, the big control parameter of the control strategy computing output that controller embeds, controller motor improves rotating speed, dosing pump
Output flow increases, and improves system pressure and accelerates cylinder movement speed to improve oil cylinder power output simultaneously.
When controller motor is rotated with maximum speed, quantitative POF reaches maximum, is that valve-controlled cylinder carries
For the high-pressure and hydraulic energy, the excess traffic outside oil cylinder start needs, system pressure can be made to rise to over design load, overflow valve
Open, excess traffic is back to low pressure oil way by overflow valve, system pressure falls after rise, maintains design load, controller output
Servo valve control current control servo valve start, output flow is maximum, and under servo valve control current control, servo valve works,
Hydraulic oil flows into oil cylinder from the delivery outlet of servo valve, promotes piston rod movement in oil cylinder；Make the outgoing position fast approaching of oil cylinder
Target location；With the motion of piston rod, the output signal change of position sensor, transmit to control as current position signal
Device；Meanwhile, piston rod is also the start part of servo control mechanism, outside power output.
S22, controller control servo valve and control further according to the position of cylinder piston rod and the difference of target location
Motor drive cylinder piston rod slows down until stablizing in target location.
Current position signal close to target location when, between two kinds of signals, error diminishes, controller output servo valve control
Electric current processed diminishes, until being zero, servo valve output flow diminishes, until being zero, the output speed of oil cylinder reduces, until stablizing
Target location, in the process, the rotating speed also controlled reduction therewith of motor, quantitative POF declines, and system pressure is therewith
Decline, until oil cylinder can be maintained static；Hereafter, motor speed maintains certain numerical value, so that quantitative POF is equal to and watches
Take valve internal hemorrhage due to trauma flow, now system pressure maintains, oil cylinder power output is equal to outer load, mechanism can maintain steady statue.
For example, at oil cylinder top, cylinder piston rod current location needs in oil cylinder bottom, then cylinder piston rod for target location
Move to oil cylinder top.
S3, to the controller new target position signal of input, controller is according to target location command signal and position sensing
The difference of the position signalling of device cylinder piston rod, controls servo valve, controlled motor to drive cylinder piston rod again；
S31, controller control servo valve and controlled motor to drive according to the position of cylinder piston rod and the difference of target location
Dynamic cylinder piston rod accelerates the new target location of movement velocity fast approaching.
The start of control cylinder based on servo valve, between target position signal and current position signal, error is larger,
Typically exceeding when system allows more than site error twice it is meant that resistance suffered by oil cylinder is larger or outgoing position is away from target position
Put farther out, the big control parameter of the control strategy computing output that controller embeds, controller motor improves rotating speed, dosing pump
Output flow increases, and improves system pressure and accelerates cylinder movement speed to improve oil cylinder power output simultaneously.
When controller motor is rotated with maximum speed, quantitative POF reaches maximum, is that valve-controlled cylinder carries
For the high-pressure and hydraulic energy, the excess traffic outside oil cylinder start needs, system pressure can be made to rise to over design load, overflow valve
Open, excess traffic is back to low pressure oil way by overflow valve, system pressure falls after rise, maintains design load, controller output
Servo valve control current control servo valve start, output flow is maximum, and under servo valve control current control, servo valve works,
Hydraulic oil flows into oil cylinder from the delivery outlet of servo valve, promotes piston rod movement in oil cylinder；Make the outgoing position fast approaching of oil cylinder
New target location；With the motion of piston rod, the output signal change of position sensor, as current position signal transmit to
Controller；Meanwhile, piston rod is also the start part of servo control mechanism, outside power output.
S32, controller control servo valve and control further according to the position of cylinder piston rod and the difference of target location
Motor drive cylinder piston rod slows down until stablizing in new target location.
Current position signal close to new target location when, between two kinds of signals, error diminishes, controller output servo
Valve control electric current diminishes, until being zero, servo valve output flow diminishes, until being zero, the output speed of oil cylinder reduces, until steady
It is scheduled on new target location, in the process, the rotating speed also controlled reduction therewith of motor, quantitative POF declines, system
Pressure declines therewith, until oil cylinder can be maintained static；Hereafter, motor speed maintains certain numerical value, makes dosing pump export stream
Amount is equal to servo valve internal hemorrhage due to trauma flow, and now system pressure maintains, and oil cylinder power output is equal to outer load, and mechanism can maintain stable shape
State.
For example, at oil cylinder top, new target location is in oil cylinder bottom, then cylinder piston rod for cylinder piston rod current location
Need to move to oil cylinder bottom.
S4, circulation execution above-mentioned steps S2 to S3, make oil cylinder hydraulic bar move back and forth.
Beneficial effect：
1) reduce seepage:External force according to suffered by oil cylinder, dynamic adjusting system pressure, when so that servo control mechanism is worked, for a long time
It is in operating on low voltage state, advantageously reduce seepage.
2) reduce power consumption:Relatively low system pressure can directly reduce the power consumption of servo control mechanism.
3) reduces cost:The function that the hydraulic component of costliness is realized is needed, using less expensive in conventional servo mechanism
Electronic devices and components composition, the controller of embedded software are realized, can be with reduces cost
In sum, embodiments provide a kind of variable pressure and flow type hydraulic servomechanism based on electric machine speed regulation.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any those familiar with the art the invention discloses technical scope in, the change or replacement that can readily occur in,
All should be included within the scope of the present invention.
Claims (10)
1. a kind of variable pressure and flow type hydraulic servomechanism based on electric machine speed regulation, including controller, oily filter, position sensor, no
Brush dc motor, dosing pump, charged piston, servo valve and oil cylinder；
Wherein, controller is connected with position sensor and servo valve respectively, and position sensor is connected with cylinder piston rod, controller
Middle motor-drive circuit is connected with brushless direct current motor, and motor is mechanically connected with dosing pump, and oil filter is arranged on dosing pump output
Mouthful, charged piston is connected with low pressure oil way, and servo valve forms valve-controlled cylinder system with oil cylinder.
2. as claimed in claim 1 a kind of variable pressure and flow type hydraulic servomechanism based on electric machine speed regulation it is characterised in that institute
State in valve-controlled cylinder system, the delivery outlet through described servo valve for the pressure oil enters oil cylinder, promote cylinder piston rod to make straight-line displacement.
3. as claimed in claim 1 a kind of variable pressure and flow type hydraulic servomechanism based on electric machine speed regulation it is characterised in that institute
State position sensor to be connected with described cylinder piston rod, obtain the position signalling of cylinder piston rod, be transferred to described controller.
4. as claimed in claim 1 a kind of variable pressure and flow type hydraulic servomechanism based on electric machine speed regulation it is characterised in that also
Including overflow valve, described overflow valve is used for making excess traffic be back to low pressure oil when system pressure rises to over design load
Road, specifically includes end cap, O-ring, valve body, cone valve, spring, screw plug.
5. the work of the variable pressure and flow type hydraulic servomechanism based on electric machine speed regulation as described in a kind of any one as claim 1-4
Method is it is characterised in that comprise the following steps：
S1, system initialization is carried out to servo control mechanism；
The cylinder piston rod that the extraneous target location command signal providing receiving and position sensor are obtained by S2, controller
The difference of current position signal be converted to servo valve control electric current, control servo valve work；Controller is believed according to error simultaneously
Number, controlled motor rotating speed, control quantitative POF change further, thus adjusting system pressure；Drive cylinder piston rod；
S3, to the controller new target position signal of input, described controller is according to new target position signal and position sensing
The difference of the position signalling of device cylinder piston rod, controls servo valve and Motor drive cylinder piston rod again；
S4, circulation execution above-mentioned steps S2 to S3, make cylinder piston rod move back and forth.
6. the method for work of the variable pressure and flow type hydraulic servomechanism based on electric machine speed regulation as claimed in claim 5, its feature
It is, described step S2 further includes：
S21, controller control servo valve and Motor drive oil cylinder to live according to the position of cylinder piston rod and the difference of target location
Target location described in movement velocity fast approaching accelerated by stopper rod；
S22, controller control servo valve and Motor drive further according to the position of cylinder piston rod and the difference of target location
Cylinder piston rod slows down until stablizing in described target location.
7. the method for work of the variable pressure and flow type hydraulic servomechanism based on electric machine speed regulation as claimed in claim 5, its feature
It is, described step S3 further includes：
S31, controller control servo valve and Motor drive oil according to the position of cylinder piston rod and the difference of new target location
Cylinder piston rod accelerates new target location described in movement velocity fast approaching；
S32, controller control servo valve and motor further according to the position of cylinder piston rod and the difference of new target location
Cylinder piston rod is driven to slow down until stablizing in described new target location.
8. the method for work of the variable pressure and flow type hydraulic servomechanism based on electric machine speed regulation as claimed in claim 6, its feature
It is, described step S21 further includes：
S211, the servo valve control current control servo valve start of described controller output, output flow increases, and hydraulic oil is from watching
The delivery outlet taking valve flows into oil cylinder, promotes cylinder piston rod motion；
, according to embedded control strategy, motor improves rotating speed for S212, described controller, and quantitative POF increases, carries
High system pressure, makes described cylinder piston rod position fast approaching target location.
9. the method for work of the variable pressure and flow type hydraulic servomechanism based on electric machine speed regulation as claimed in claim 6, its feature
It is, described step S22 further includes：
S221, the servo valve control servo valve start of described controller output, output flow diminishes, until being zero, oil cylinder defeated
Go out speed to reduce, until stablizing in target location；
The control strategy controlled motor that S222, described controller embed reduces rotating speed, and quantitative POF declines, system pressure
Decline therewith, until cylinder piston rod can be maintained static；
The control strategy controlled motor rotating speed that S223, described controller embed maintains certain numerical value, makes quantitative POF
Equal to servo valve internal hemorrhage due to trauma flow.
10. the method for work of the variable pressure and flow type hydraulic servomechanism based on electric machine speed regulation as claimed in claim 5, its feature
It is also to include：
When described controller drives described motor to rotate with maximum speed, described quantitative POF reaches maximum, oil
Excess traffic outside cylinder start needs, makes system pressure rise to over design load, overflow valve is opened, and excess traffic passes through to overflow
Stream valve is back to low pressure oil way, and system pressure falls after rise, maintains design load.
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| CN201610849277.0A CN106438584B (en) | 2016-09-23 | 2016-09-23 | A kind of variable pressure and flow type hydraulic servomechanism and method of work based on electric machine speed regulation |
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Cited By (3)
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| CN111501869A (en) * | 2020-05-20 | 2020-08-07 | 三一重机有限公司 | Electric control hydraulic servo control system and method and electric excavator |
| CN116255493A (en) * | 2023-05-15 | 2023-06-13 | 苏州海卓伺服驱动技术有限公司 | Servo valve adjusting and controlling method and system |
| CN117212292A (en) * | 2023-09-19 | 2023-12-12 | 佛山市康思达液压机械有限公司 | Hydraulic press oil cylinder positioning control method, device, equipment and storage medium |
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| CN106438584B (en) | 2018-04-20 |
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