CN106762970B - A kind of double ratio control structures and control method of variable displacement motor - Google Patents
A kind of double ratio control structures and control method of variable displacement motor Download PDFInfo
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- CN106762970B CN106762970B CN201611215280.3A CN201611215280A CN106762970B CN 106762970 B CN106762970 B CN 106762970B CN 201611215280 A CN201611215280 A CN 201611215280A CN 106762970 B CN106762970 B CN 106762970B
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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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/202—Externally-operated valves mounted in or on the actuator
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
- F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Hydraulic Motors (AREA)
- Servomotors (AREA)
Abstract
The invention discloses the double ratio control structures and control method of a kind of variable displacement motor, including variable cylinder (2), proportional control valve (3) and the high pressure autocontrol valve (4) connecting with motor (1)；High pressure autocontrol valve (4) is equipped with high voltage control feedback spring (5), and high voltage control feedback spring (5) is connected with the tail end of proportional control valve (3)；Proportional control valve (3) head end is equipped with feedback spring (6), and feedback spring (6) is connected with variable cylinder (2)；It is that proportional control valve is adjusted or high pressure automatically controls valve regulation that high pressure autocontrol valve, which controls to adjust type according to motor inlet pressure,；The high pressure autocontrol valve is adjusted to that the motor oil inlet high pressure being subject to is acted on feedback spring through high voltage control feedback spring, realizes the proportion adjustment process of high pressure autocontrol valve.The present invention has the characteristics that interfering with each other between control valve can be eliminated and improves the control stability of control valve.
Description
Technical field
The present invention relates to a kind of variable displacement motor, double ratio control structures of especially a kind of variable displacement motor.
Background technique
In project hydropress tool, all motors only have a kind of control mode, cannot achieve the non-of two control modes
The superposition of interference superposition or the control of double ratios, is not able to satisfy host to a variety of demands of motor control, existing to have double control
Variable displacement motor in HD1D (truncation of guide's hydraulic control plus-pressure) and EP2D (truncation of electric proportional control plus-pressure) be main control
Mode, both control modes use series design, therefore can not solve the interference problem between two kinds of valve controls, especially in the ban
It leads pilot operated valve device or when electric proportional control valve is in different working condition, large variation occurs in the setting value that will lead to constant pressure valve, this
It is that cause constant pressure valve operating point to change because high-voltage oil liquid is different because of its throttle by meeting when first control valve, this
It is two valves the problem of interfering with each other；On the other hand, since pressure cutoff valve is not Displacement Feedback or angle feed-back, cause
When constant pressure is truncated, control stability is bad.Therefore, there is easily interfere with each other and control between two kinds of valve controls for existing technology
The bad problem of stability.
Summary of the invention
The object of the present invention is to provide a kind of double ratio control structures of variable displacement motor.It is each with that can eliminate
Interfering with each other between control valve and the characteristics of improve the control stability of control valve.
Technical solution of the present invention: a kind of double ratio control structures of variable displacement motor, including connect with motor through check valve
Variable cylinder, proportional control valve and high pressure autocontrol valve；High pressure autocontrol valve end is equipped with high voltage control and feeds back bullet
Spring, high voltage control feedback spring are connected with the tail end of proportional control valve；The proportional control valve head end is equipped with feedback spring, feedback
Spring is connected with variable cylinder, and proportional control valve also passes through oil circuit and is connected with variable cylinder.
In a kind of double ratio control structures of variable displacement motor above-mentioned, the high pressure autocontrol valve includes being arranged in high pressure
Control valve core in autocontrol valve, control valve core are connected with high voltage control feedback spring, the control valve spool end
It is additionally provided with high voltage control induction spring.
In a kind of double ratio control structures of variable displacement motor above-mentioned, the feedback spring end is connected with feedback rod, instead
Feedback bar is connected with flow piston, is equipped with driving lever in the middle part of flow piston, and driving lever is connected with swash plate, and swash plate is connected with rotor assembly, turns
Sub-component is connected with spindle assemblies；The proportional control valve head end is additionally provided with starting point adjustment spring.
In a kind of double ratio control structures of variable displacement motor above-mentioned, the proportional control valve is electric proportional control valve, electricity
Proportional control valve includes electric proportional valve spool, and electric proportional valve spool tail end is equipped with electromagnet, electric proportional valve spool tail end and high pressure
It controls feedback spring to be connected, electric proportional valve spool head end is connected with feedback spring, and spool step is equipped in the middle part of electric proportional valve spool.
In a kind of double ratio control structures of variable displacement motor above-mentioned, the proportional control valve is the control of guide's hydraulic control ratio
Valve.
Realize a kind of control method of double ratio control structures of variable displacement motor above-mentioned, high pressure autocontrol valve is according to horse
Controlling to adjust type up to inlet pressure is that proportional control valve is adjusted or high pressure automatically controls valve regulation.
In a kind of double proportional controlling means of variable displacement motor above-mentioned, the high pressure autocontrol valve adjustment process is to pass through
The high voltage control feedback spring of proportional control valve tail end is set, and the motor oil inlet high pressure that high pressure autocontrol valve is subject to is made
For the feedback spring of proportional control valve, by interfering the feedback spring elastic force of proportional control valve to realize high pressure autocontrol valve
Proportion adjustment process.
A kind of double proportional controlling means of variable displacement motor above-mentioned, the proportional control valve adjusting is electric proportional control valve tune
Section；It is according to motor oil inlet pressure that electric proportional control valve regulation and high pressure, which automatically control double proportion adjustment processes that valve regulation is constituted,
Force value size, selection controls the movement of electric proportional valve spool by electric current or motor inlet pressure, to control variable
The movement of flow piston generates pressing force to feedback spring in cylinder, so that the electric ratio that electric current or motor inlet pressure are controlled
Equilibrium relation is formed between the pressing force that example valve core movement value and feedback spring generate, and then is realized according to electric current or motor
Inlet pressure carries out continuous, proportional adjusting to motor displacement in ratio variation, final to realize double proportion adjustments.
In a kind of double proportional controlling means of variable displacement motor above-mentioned, when motor inlet pressure incudes lower than high voltage control
When the setting pretightning force of spring, certain current signal value, small end variable cylinder A normal open motor oil inlet, electric current are given to electromagnet
Value makes to open (left side closings) on the right side of spool step, into high pressure oil in big end variable cylinder B, flow piston small displacement side upwards
To movement, rotor assembly rotation is driven to cause variable by driving lever, and the movement of flow piston can improve the compression to feedback spring
Power, the pressing force force the right side of spool step to close (left side opening), release pressure oil in big end variable cylinder B, cause
For flow piston downwards to huge discharge direction moving in rotation, flow piston relaxes the pressing force to feedback spring, by so several
After secondary repetitive control variation, swash plate is ultimately in the specified correspondence discharge capacity of current signal value and keeps balancing；
In a kind of double proportional controlling means of variable displacement motor above-mentioned, when input current is constant, the pressure of motor oil inlet
When incuding the setting pretightning force of spring more than high voltage control, it is corresponding according to the variation of pressure value generation that high pressure automatically controls spool
Displacement so that high voltage control feedback spring generates corresponding compression spring force, high voltage control feedback spring will compress
Spring-force driven dual is in electric proportional valve spool, so that motor inlet pressure is changed by high voltage control feedback spring is in equilibrium-like
The stress of feedback spring in state causes the variation of discharge capacity.
The control method for realizing a kind of double ratio control structures of variable displacement motor above-mentioned, according to motor inlet pressure value
Size, selection controls the movement of ratio valve core by pilot control pressure or motor inlet pressure, to control change
The movement for measuring flow piston in cylinder generates pressing force to feedback spring, so that pilot control pressure or motor inlet pressure institute
Equilibrium relation is formed between the pressing force that the movement value and feedback spring of the ratio valve core of control generate, and then is realized according to elder generation
The variation for leading control pressure or inlet pressure carries out continuous, proportional adjusting to discharge capacity, realizes double proportion adjustments.
Compared with prior art, the present invention is superposed a high pressure by the spool tail end in proportional control valve and controls automatically
The high voltage control feedback spring of valve processed makes high pressure autocontrol valve reach high pressure autocontrol valve control experiencing motor oil inlet
When range processed, high-voltage signal is acted on active force on the spool of proportional control valve by high voltage control feedback spring, ratio
Power is then acted on the feedback spring of proportional control valve by control valve core, that is, passes through the feedback spring elastic force of interference proportional control valve
The ratio process for realizing that high pressure automatically controls does not have since the high-voltage oil liquid in the present invention only passes through the oil circuit of proportional control valve
The phenomenon that two control valves will appear different throttles is flowed through, therefore removes interfering with each other in bivalve control process and asks
Topic；Made again because high pressure is automatically controlled by the high voltage control feedback spring of its own with the feedback spring for influencing proportional control valve
It exerts oneself to realize the Displacement Feedback function of high pressure automatic control, therefore realizes the ratio control process of high pressure autocontrol valve,
Essence is feedback spring power of the high pressure autocontrol valve by influence and change proportional control valve, realizes indirectly and ratio controls
Valve is noiseless and realizes the purpose of Auto-proportion control, improves stability when bivalve control.In conclusion the present invention has
The characteristics of interfering with each other between each control valve can be eliminated and improve the control stability of control valve.
Detailed description of the invention
Fig. 1 is circuit controling drawing of the invention；
Fig. 2 is structure chart of the invention；
Fig. 3 is the partial enlarged view of Fig. 2；
Fig. 4 is electric current load and pressure-loaded figure；
Fig. 5 is variable curve graph.
Description of symbols in attached drawing: 1- motor, 2- variable cylinder, 3- proportional control valve, 4- high pressure autocontrol valve, 5- high pressure
Control feedback spring, 6- feedback spring, 7- feedback rod, 8- flow piston, 9- driving lever, 10- swash plate, 11- rotor assembly, 12- master
Shaft assembly, 13- check valve, 14- starting point adjustment spring, 15- spool step, 16- spring base, 17- pressure spring seat, 18- are automatically controlled
Adjust screw, the pressure self-controlled adjusting screw of 19-, 31- electric proportional valve spool, 32- electromagnet, 41- control valve core, 42- high pressure
Control induction spring, A- small end variable cylinder, B- big end variable cylinder.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples, but not as the foundation limited the present invention.
Embodiment 1.A kind of double ratio control structures of variable displacement motor, constitute as shown in Figures 1 to 5, including with motor 1 into
Variable cylinder 2, proportional control valve 3 and the high pressure autocontrol valve 4 that hydraulic fluid port is connected through check valve 13；The high pressure autocontrol valve 4
End is equipped with high voltage control feedback spring 5, and high voltage control feedback spring 5 is connected with the tail end of proportional control valve 3；The ratio control
3 head end of valve processed is equipped with feedback spring 6, and feedback spring 6 is connected with variable cylinder 2, and proportional control valve 3 also passes through oil circuit and variable cylinder 2
It is connected.
The high pressure autocontrol valve 4 includes the control valve core 41 being arranged in high pressure autocontrol valve 4, control valve valve
Core 41 is connected with high voltage control feedback spring 5, and 41 end of control valve core is additionally provided with high voltage control induction spring 42.
6 end of feedback spring is connected with feedback rod 7, and feedback rod 7 is connected with flow piston 8, sets in the middle part of flow piston 8
There is driving lever 9, driving lever 9 is connected with swash plate 10, and swash plate 10 is connected with rotor assembly 11, and rotor assembly 11 is connected with spindle assemblies 12；
3 head end of proportional control valve is additionally provided with starting point adjustment spring 14.
The proportional control valve 3 is electric proportional control valve, and electric proportional control valve includes electric proportional valve spool 31, electric proportional valve
31 tail end of spool is equipped with electromagnet 32, and 31 tail end of electric proportional valve spool is connected with high voltage control feedback spring 5, electric proportional valve spool
31 head ends are connected with feedback spring 6, and spool step 15 is equipped in the middle part of electric proportional valve spool 31.
6 end of feedback spring is connected with spring base 16, and electric proportional control valve is equipped with pressure self-controlled adjusting screw 19,
High pressure autocontrol valve 4 is equipped with automatically controlled adjusting screw 18 and pressure spring seat 17, high voltage control feedback spring 5 and high voltage control
Induction spring 42 is connected with pressure spring seat 17.
High pressure autocontrol valve 4 according to motor inlet pressure control to adjust type be proportional control valve adjust or high pressure from
Dynamic control valve is adjusted；The high pressure autocontrol valve adjustment process is the high voltage control by the way that 3 tail end of proportional control valve is arranged in
The motor oil inlet high pressure that high pressure autocontrol valve 4 is subject to is acted on the feedback spring 6 of proportional control valve 3 by feedback spring 5,
By interfering 6 elastic force of feedback spring of proportional control valve 4 to realize the proportion adjustment process of high pressure autocontrol valve 4.
A kind of control method of double ratio control structures of variable displacement motor, electric proportional control valve regulation and high pressure automatically control
Double proportion adjustment processes that valve regulation is constituted are according to motor inlet pressure value size, and selection passes through electric current or motor oil inlet
Mouthful pressure controls the movement of electric proportional valve spool 31, to control the movement of flow piston 8 in variable cylinder 2 to feedback spring 6
Pressing force is generated, so that 31 movement value of electric proportional valve spool and feedback spring 6 that electric current or motor inlet pressure are controlled
It forms equilibrium relation between the pressing force of generation, and then realizes according to electric current or motor inlet pressure in ratio variation pair
Motor displacement carries out continuous, proportional adjusting, final to realize double proportion adjustments.
When setup pressure value of the motor inlet pressure lower than high voltage control induction spring 42, then entire control is with electric ratio
Control valve control accounts for leading；When setup pressure value of the motor inlet pressure more than high voltage control induction spring 42, then entire control
System is accounted for leading with the control of 4 ratio of high pressure autocontrol valve.Entire rate variable process is referring to shown in Fig. 4.
When setting pretightning force of the motor inlet pressure lower than high voltage control induction spring, electromagnet 32 is given centainly
Current signal value, small end variable cylinder A normal open motor oil inlet, current value make to open (left side closing) on the right side of spool step 15, greatly
It holds and enters high pressure oil in variable cylinder B, small displacement direction is mobile upwards for flow piston 8, drives rotor assembly 11 to revolve by driving lever 9
Variable is quoted, and 8 movement of flow piston can improve the pressing force to feedback spring 6, which forces spool step 15
(left side opening) is closed on right side, is released pressure oil in big end variable cylinder B, is caused flow piston 8 downwards to huge discharge direction
Moving in rotation, flow piston 8 relax the pressing force to feedback spring 6, after so repetitive control variation several times, swash plate 10
It is ultimately in the specified correspondence discharge capacity of current signal value and keeps balancing.
When input current is constant, and the pressure of motor oil inlet is more than the setting pretightning force of high voltage control induction spring 42,
It controls valve core 41 and corresponding displacement is generated according to the variation of pressure value, so that high voltage control feedback spring 5 generates phase
Compression spring force is acted on electric proportional valve spool 31 by corresponding compression spring force, high voltage control feedback spring 5 so that motor into
Hydraulic fluid port pressure changes the stress of the feedback spring 6 in equilibrium state by high voltage control feedback spring 5, causes the change of discharge capacity
Change.
It is completed since two valve control functions are merged into a valve control, the feedback spring 6 and height of electric proportional control valve are voltage-controlled
Feedback spring 5 processed acts on the same electric proportional valve spool 31, no longer there is the unfavorable interference effect between two valve controls；
Enable two kinds of control modes mutually coordinated, variable interference does not occur from each other.
Embodiment 2.A kind of double ratio control structures of variable displacement motor, including connect with 1 oil inlet of motor through check valve 13
Variable cylinder 2, proportional control valve 3 and high pressure autocontrol valve 4；It is anti-that 4 end of high pressure autocontrol valve is equipped with high voltage control
Spring 5 is presented, high voltage control feedback spring 5 is connected with the tail end of proportional control valve 3；3 head end of proportional control valve is equipped with feedback
Spring 6, feedback spring 6 are connected with variable cylinder 2, and proportional control valve 3 is also connected by oil circuit with variable cylinder 2.
The proportional control valve 3 is guide's hydraulic control proportional control valve.
The proportional control valve 3 be include the ratio valve core being arranged in proportional control valve, ratio valve core tail end with
High voltage control feedback spring 5 is connected, and ratio valve core head end is connected with feedback spring 6.
The ratio valve core head end is additionally provided with starting point adjustment spring 32.
6 end of feedback spring is connected with feedback rod 7, and feedback rod 7 is connected with flow piston 8, sets in the middle part of flow piston 8
There is driving lever 9, driving lever 9 is connected with swash plate 10, and swash plate 10 is connected with rotor assembly 11, and rotor assembly 11 is connected with spindle assemblies 12.
The high pressure autocontrol valve 4 includes the control valve core 41 being arranged in high pressure autocontrol valve 4, control valve valve
Core 41 is connected with high voltage control feedback spring 5, and 41 end of control valve core is additionally provided with high voltage control induction spring 42.
The feedback spring end is connected with spring base 16, and proportional control valve is equipped with pressure self-controlled adjusting screw 19, high
Autocontrol valve is pressed to be equipped with automatically controlled adjusting screw 18 and pressure spring seat 17, high voltage control feedback spring 5 and high voltage control sense
Spring 42 is answered to be connected with pressure spring seat 17.
A kind of control method of double ratio control structures of variable displacement motor, according to motor inlet pressure value size, selection
The movement of ratio valve core is controlled by pilot control pressure or motor inlet pressure, to control flow in variable cylinder
The movement of piston generates pressing force to feedback spring, so that the ratio that pilot control pressure or motor inlet pressure are controlled
Equilibrium relation is formed between the pressing force that the movement value and feedback spring of valve core generate, and then is realized according to pilot control pressure
Or the variation of inlet pressure carries out continuous, proportional adjusting to discharge capacity, realizes double proportion adjustments.
Claims (8)
1. a kind of double ratio control structures of variable displacement motor, it is characterised in that: including what is connect with motor (1) through check valve (13)
Variable cylinder (2), proportional control valve (3) and high pressure autocontrol valve (4)；High pressure autocontrol valve (4) end is equipped with high pressure
It controls feedback spring (5), high voltage control feedback spring (5) is connected with the tail end of proportional control valve (3)；The proportional control valve
(3) head end is equipped with feedback spring (6), and feedback spring (6) is connected with variable cylinder (2), and proportional control valve (3) also by oil circuit and becomes
Cylinder (2) are measured to be connected；The high pressure autocontrol valve (4) includes the control valve core being arranged in high pressure autocontrol valve (4)
(41), control valve core (41) is connected with high voltage control feedback spring (5), and control valve core (41) end is additionally provided with high pressure
Control induction spring (42)；Feedback spring (6) end is connected with feedback rod (7), and feedback rod (7) is connected with flow piston
(8), flow piston (8) is located in variable cylinder (2), is equipped with driving lever (9) in the middle part of flow piston (8), and driving lever (9) is connected with swash plate
(10), swash plate (10) is connected with rotor assembly (11), and rotor assembly (11) is connected with spindle assemblies (12)；The proportional control valve
(3) head end is additionally provided with starting point adjustment spring (14).
2. a kind of double ratio control structures of variable displacement motor according to claim 1, it is characterised in that: the ratio control
Valve (3) is electric proportional control valve, and electric proportional control valve includes electric proportional valve spool (31), and electric proportional valve spool (31) tail end is equipped with
Electromagnet (32), electric proportional valve spool (31) tail end are connected with high voltage control feedback spring (5), electric proportional valve spool (31) head end
It is connected with feedback spring (6), is equipped with spool step (15) in the middle part of electric proportional valve spool (31).
3. a kind of double ratio control structures of variable displacement motor according to claim 1, it is characterised in that: the ratio control
Valve (3) is guide's hydraulic control proportional control valve.
4. realizing a kind of control method of double ratio control structures of variable displacement motor as claimed in claim 2, it is characterised in that: high
Pressing autocontrol valve to control to adjust type according to motor inlet pressure is proportional control valve adjusting or high pressure autocontrol valve tune
Section.
5. control method according to claim 4, it is characterised in that: the process that the high pressure automatically controls valve regulation is logical
The high voltage control feedback spring that proportional control valve tail end is set is crossed, the motor oil inlet high pressure that high pressure autocontrol valve is subject to
The feedback spring for acting on proportional control valve, by interfering the feedback spring elastic force of proportional control valve to realize high pressure autocontrol valve
Proportion adjustment process.
6. control method according to claim 4, it is characterised in that: the proportional control valve adjusting is electric proportional control valve
It adjusts；It is according to motor oil inlet that electric proportional control valve regulation and high pressure, which automatically control double proportion adjustment processes that valve regulation is constituted,
Pressure value size, selection controls the movement of electric proportional valve spool by electric current or motor inlet pressure, to control change
The movement for measuring flow piston in cylinder generates pressing force to feedback spring, so that the electricity that electric current or motor inlet pressure are controlled
Equilibrium relation is formed between the pressing force that ratio valve core movement value and feedback spring generate, and then is realized according to electric current or horse
Continuous, proportional adjusting is carried out to motor displacement in ratio variation up to inlet pressure, it is final to realize double proportion adjustments.
7. control method according to claim 6, it is characterised in that: when motor inlet pressure incudes lower than high voltage control
When the setting pretightning force of spring, certain current signal value, small end variable cylinder A normal open motor oil inlet, electric current are given to electromagnet
Value makes to open on the right side of spool step, left side is closed, and enters high pressure oil in big end variable cylinder B, flow piston small displacement side upwards
To movement, rotor assembly moving in rotation is driven to cause variable by driving lever, and the movement of flow piston can be improved to feedback spring
Pressing force, which forces the right side of spool step to be closed, left side is opened, and releases pressure oil in big end variable cylinder B, leads
Cause flow piston downwards to huge discharge direction moving in rotation, flow piston relaxes the pressing force to feedback spring, by such
After repetitive control variation several times, swash plate is ultimately in the specified correspondence discharge capacity of current signal value and keeps balancing.
8. control method according to claim 6, it is characterised in that: when input current is constant, the pressure of motor oil inlet
When incuding the setting pretightning force of spring more than high voltage control, control valve core generates corresponding position according to the variation of pressure value
It moves, so that high voltage control feedback spring generates corresponding compression spring force, high voltage control feedback spring is by compressed spring
Power acts on electric proportional valve spool, so that motor inlet pressure is changed in equilibrium state by high voltage control feedback spring
Feedback spring stress, cause the variation of discharge capacity.
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| CN110486339B (en) * | 2019-08-27 | 2021-02-09 | 徐州重型机械有限公司 | Motor control system and crane |
| CN111691923A (en) * | 2020-06-19 | 2020-09-22 | 中航力源液压股份有限公司 | Straight-shaft type axial plunger variable motor device with constant pressure control |
| CN112283432A (en) * | 2020-11-25 | 2021-01-29 | 力源液压（苏州）有限公司 | Hydraulic system, closed plunger pump and bidirectional electric proportional displacement control device |
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Application publication date: 20170531 Assignee: Suzhou Liyuan Hydraulic Co.,Ltd. Assignor: AVIC LIYUAN HYDRAULIC Co.,Ltd. Contract record no.: X2023520000006 Denomination of invention: A Dual Proportional Control Structure and Control Method for Variable Motor Granted publication date: 20190628 License type: Exclusive License Record date: 20230606 |
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