CN106089868A - Energy recovery pump, road vehicle and engineering machinery - Google Patents
Energy recovery pump, road vehicle and engineering machinery Download PDFInfo
- Publication number
- CN106089868A CN106089868A CN201610643419.8A CN201610643419A CN106089868A CN 106089868 A CN106089868 A CN 106089868A CN 201610643419 A CN201610643419 A CN 201610643419A CN 106089868 A CN106089868 A CN 106089868A
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- Prior art keywords
- pump
- motor
- energy recovery
- swash plate
- pivot angle
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/14—Energy-recuperation means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/88—Control measures for saving energy
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Reciprocating Pumps (AREA)
Abstract
The present invention relates to a kind of energy recovery pump, road vehicle and engineering machinery, wherein, energy recovery pump includes: oil circuit control, pump motor and for controlling the variable cylinder of swash plate pivot angle of pump motor, oil circuit control can change the swash plate pivot angle of pump motor to variable cylinder fuel feeding, switches realizing pump motor between pump condition and motor operating conditions.Energy recovery pump is by selecting pump motor and being provided for controlling the variable cylinder of the swash plate pivot angle of pump motor, oil circuit control can realize pump motor to variable cylinder fuel feeding with the swash plate pivot angle changing pump motor and freely switch between pump condition and motor operating conditions, make energy recovery pump can use output hydraulic pressure energy as pump, can use the hydraulic energy transfer of input as motor again is mechanical energy recycling, and easy to control fast, cost is relatively low, has higher exploitativeness.
Description
Technical field
The present invention relates to rotating machine art field, particularly relate to a kind of energy recovery pump, road vehicle and engineering machinery.
Background technology
Engineering machinery is owing to application is wide, quantity is many, and the energy, the pollutant of discharge that are consumed create serious shadow to environment
Ring, it is realized one of target having become as domestic and international project machinery new-product development efficient, energy-conservation.In current hydraulic pressure unit
In part, existing variable pump can only realize pumping function, can only control swash plate and change in the range of 0～-a ° of pivot angle, it is impossible to realize horse
Reach function, it is impossible to realize energy regenerating and utilize function.
Energy saving research based on Energy Recovery Technology needs the plunger displacement pump of a specific function, and it is at high pressure hydraulic fluid port and main shaft
In the case of rotation direction is constant, output hydraulic pressure energy can be used as pump, can use accumulator hydraulic energy transfer as motor again
Recycle for mechanical energy.
Summary of the invention
For overcoming above technological deficiency, present invention solves the technical problem that and be to provide a kind of energy recovery pump, it is possible to can
Use as pump, can use as motor again.
For solving above-mentioned technical problem, the invention provides a kind of energy recovery pump, comprising: oil circuit control, pump motor
And for controlling the variable cylinder of the swash plate pivot angle of pump motor, oil circuit control can change the oblique of pump motor to variable cylinder fuel feeding
Dish pivot angle, switches realizing pump motor between pump condition and motor operating conditions.
Preferably, pump motor is oblique tray type axial plunger piston variable pump.
Further, variable cylinder has motor displacement maximum travel position, zero delivery travel position and pumpage maximum
Travel position；
Under pump condition, the travel position of the piston of variable cylinder is in zero delivery travel position and pumpage range position
Between putting；
Under motor operating conditions, the travel position of the piston of variable cylinder is in zero delivery travel position and motor displacement maximum row
Between journey position.
Further, the proportioning valve being arranged on oil circuit control is also included；
Under pump condition, proportioning valve is shown in a fully open operation；
Under pump motor operating conditions, proportioning valve can change the oil circuit control fuel delivery to variable cylinder to realize the horse of pump motor
Reach discharge capacity adjustable.
Further, proportioning valve is electromagnetic proportional valve, and electromagnetic proportional valve is shown in a fully open operation when dead electricity.
Further, oil circuit control is to the rodless cavity fuel feeding of variable cylinder, and the piston rod of variable cylinder is for controlling pump motor
Swash plate pivot angle, piston rod is provided with swash plate pivot angle feedback part, is provided with swash plate pivot angle feedback between swash plate pivot angle feedback part and proportioning valve
Spring；
Under pump condition, swash plate pivot angle feedback spring is in pre-pressing state so that proportioning valve under electric and dead electricity all
It is shown in a fully open operation；
Being under maximum pump discharge state at pump motor operating conditions and pump motor, swash plate pivot angle feedback spring is in free state.
Further, also including resetting means, under the independent action of resetting means, pump motor is in pump maximum pump discharge position
Put.
Further, also include load-sensitive flow control valve and the pressure shut-off valve being arranged on oil circuit control, load
The load feedback end end of sensitive flow control valve communicates with load feedback mouth, and the control fluid of oil circuit control is by the work of pump motor
Oil circuit provides.
Further, also include shuttle valve and constant pressure oil source oil-in, the first oil-in of shuttle valve and the working oil of pump motor
Road communicates, and the second oil-in of shuttle valve communicates with constant pressure oil source oil-in, and oil circuit control communicates with the oil-out of shuttle valve.
Present invention also offers a kind of road vehicle, it includes above-mentioned energy recovery pump.
Present invention also offers a kind of engineering machinery, it includes above-mentioned energy recovery pump.
Thus, based on technique scheme, energy recovery pump of the present invention is by selecting pump motor and being provided for controlling pump
The variable cylinder of the swash plate pivot angle of motor, oil circuit control can realize pump to variable cylinder fuel feeding with the swash plate pivot angle changing pump motor
Motor freely switches between pump condition and motor operating conditions so that energy recovery pump can use output hydraulic pressure energy as pump, again
Can use the hydraulic energy transfer of input as motor is mechanical energy recycling, and easy to control fast cost is relatively low, has
Higher exploitativeness.Road vehicle of the present invention and engineering machinery the most correspondingly have above-mentioned Advantageous Effects.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this
Bright schematic description and description is only used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural principle schematic diagram of energy recovery pump embodiment of the present invention.
Detailed description of the invention
Below by drawings and Examples, technical scheme is described in further detail.
The detailed description of the invention of the present invention be for the ease of to the design of the present invention, solved the technical problem that, constituted skill
The technical characteristic of art scheme and the technique effect brought have further description.It should be noted that for these embodiment party
The explanation of formula is not intended that limitation of the invention.Additionally, the technical characteristic related in embodiments of the present invention below is only
The conflict of not constituting each other just can be mutually combined.
In one schematic embodiment of energy recovery pump of the present invention, as it is shown in figure 1, energy recovery pump includes: control
Oil circuit, pump motor 2 and for controlling the variable cylinder 3 of swash plate pivot angle of pump motor 2, oil circuit control can be to variable cylinder 3 fuel feeding
Change the swash plate pivot angle of pump motor 2, switch between pump condition and motor operating conditions realizing pump motor 2.
In this schematic embodiment, by selecting pump motor 2 and being provided for controlling the swash plate pivot angle of pump motor
Variable cylinder 3, pump motor is that one can realize pumping function, can realize again the special Hydraulic Elements of motor function, oil circuit control energy
Reach and realize pump motor 2 freedom between pump condition and motor operating conditions to variable cylinder 3 fuel feeding with the swash plate pivot angle changing pump motor 2
Switching so that energy recovery pump can use output hydraulic pressure energy as pump, can use as motor again and be turned by the hydraulic energy of input
Turn to mechanical energy recycling, and easy to control fast cost is relatively low, has higher exploitativeness.Wherein, pump motor 2 is excellent
Selection of land is oblique tray type axial plunger piston variable pump, can be real easily by changing the swash plate pivot angle of oblique tray type axial plunger piston variable pump
Existing pump motor 2 freely switching between pump condition and motor operating conditions, such as, when swash plate pivot angle swings in the range of 0 °～-a °,
Pump motor 2 is in pump condition；When swash plate pivot angle swings in the range of 0 °～a °, and pump motor 2 is in motor operating conditions.Wherein-a ° and
The a ° of maximum being respectively swash plate pivot angle bears swinging and the positive swinging of maximum.Wherein, energy recovery pump preferably includes resetting
Device 1, under the independent action of resetting means 1, pump motor 2 is in pump displacement, so arranges and ensure that pump horse
Reach 2 and be positioned at pump displacement in an initial condition.Resetting means 1 can be oil cylinder independent by as illustrated in fig. 1
Composition, is provided with the back-moving spring promoting piston in this in-oil cylinder rodless cavity；Can also be by being arranged in variable cylinder 3
Back-moving spring forms, and certainly can also is that other versions, will not enumerate at this.
In or preferred embodiment concrete energy recovery pump of the present invention, as it is shown in figure 1, variable cylinder 3 has motor
Discharge capacity maximum travel position A, zero delivery travel position D and pumpage maximum travel position C；Under pump condition, variable cylinder 3
The travel position of piston is between zero delivery travel position D and pumpage maximum travel position C；Under motor operating conditions, variable
The travel position of the piston of cylinder 3 is between zero delivery travel position D and motor displacement maximum travel position A.Motor row is set
Amount maximum travel position A, zero delivery travel position D and pumpage maximum travel position C can be easy to adjust swash plate accordingly
The position of pivot angle, in this specific embodiment, piston from pumpage maximum travel position C to the shifting of zero delivery travel position D
Dynamic corresponding to swash plate pivot angle-a °～the swing of 0 °, piston from zero delivery travel position D to motor displacement maximum travel position A
Between movement corresponding to swash plate pivot angle 0 °～the swing of a °.
Adjustable in order to realize motor displacement under pump motor operating conditions, in a preferred embodiment, as it is shown in figure 1, energy
Amount recovery pump also includes the proportioning valve 6 being arranged on oil circuit control；Under pump condition, proportioning valve 6 is shown in a fully open operation；Pump horse
Reaching under operating mode, it is adjustable to the motor displacement realizing pump motor 2 that proportioning valve 6 can change the oil circuit control fuel delivery to variable cylinder 3.
Wherein it is highly preferred that proportioning valve 6 is electromagnetic proportional valve, electromagnetic proportional valve is shown in a fully open operation when dead electricity.Work as electromagnetic proportional valve
When obtaining electric, the oil circuit control fuel delivery to variable cylinder 3 can be controlled by controlling size of current, then change the big of swash plate pivot angle
The little motor displacement adjusting pump motor 2.Wherein, in order to ensure the use safety of motor operating conditions, pump during electromagnetic proportional valve dead electricity
Motor 2 is in motor maximum pump discharge, increases control electric current discharge capacity and reduces, i.e. motor displacement is inversely proportional with control electric current.
How variable cylinder 3 is realized to the control of the swash plate pivot angle to pump motor 3, a concrete or preferred embodiment
In, as it is shown in figure 1, oil circuit control is to the rodless cavity fuel feeding of variable cylinder 3, the piston rod of variable cylinder 3 is for controlling the oblique of pump motor 2
Dish pivot angle, piston rod is provided with swash plate pivot angle feedback part 8, is provided with swash plate pivot angle feedback between swash plate pivot angle feedback part 8 and proportioning valve 6
Spring 7；Under pump condition, swash plate pivot angle feedback spring 7 is in pre-pressing state so that proportioning valve 6 under electric and dead electricity all
It is shown in a fully open operation；Being under maximum pump discharge state at pump motor operating conditions and pump motor 2, swash plate pivot angle feedback spring 7 is in certainly
By state.So ensure that swash plate pivot angle feedback spring 7 does not allows to be relaxed to depart from bullet under pump condition or motor operating conditions
Spring abutment and electric proportional valve core, under pump condition, swash plate pivot angle feedback spring 7 is in pre-pressing state, oblique during motor operating conditions maximum pump discharge
Dish pivot angle feedback spring 7 is in free state.Under motor operating conditions, when increasing control electric current, swash plate pivot angle feedback spring 7 is by certainly
Changed to pre-pressing state by state, complete pump motor 2 from maximum pump discharge to the control of minimum injection rate, then under pump condition arbitrarily
The pre-pressing force of the swash plate pivot angle feedback spring 7 of discharge capacity will exceed the maximum thrust of electric magnet, therefore proportioning valve 6 is anticipated under pump condition
Outer electric also cannot commutate, i.e. proportioning valve 6 is shown in a fully open operation all the time, it is to avoid the impact controlling pump discharge.The present invention is led to
Cross Electromagnetic Control and realize the functional shift of pump condition and motor operating conditions, do not interfere with each other.
For how realizing under pump condition, the load-sensitive pressure reduction of pump motor being controlled, an embodiment improved
In, as it is shown in figure 1, energy recovery pump also includes load-sensitive flow control valve 5 and the pressure cut off being arranged on oil circuit control
Valve 4, the load feedback end end of load-sensitive flow control valve 5 communicates with load feedback mouth X, and the control fluid of oil circuit control is by pump
The working oil path of motor 2 provides, that is the actuator port B of pump motor 2 communicates with oil circuit control.As it is shown in figure 1, pump motor 2 goes out
The pressure oil of mouth arrives load-sensitive flow control valve 5 and pressure shut-off valve 4 through proportioning valve 6, by load-sensitive flow control
Valve 5 processed compares the feedback pressure difference regulation swash plate angle between pump discharge pressure and load feedback mouth X in the range of 0～-a °
Swing, to meet system flow demand；When pump discharge pressure reach pressure shut-off valve 4 set pressure time, pressure shut-off valve 4 commutates
To left position, regulation pump motor 2 is in the minimum injection rate position of pump, no longer output flow, it is ensured that pump motor 2 non-overloading.Wherein, negative
The control end carrying sensitive flow control valve 5 and pressure shut-off valve 4 all communicates with oil circuit control, load-sensitive flow control valve 5 He
The oil-in of pressure shut-off valve 4 the most all communicates with oil circuit control, and the load feedback end of load-sensitive flow control valve 5 and pressure are cut
The oil outlet end of disconnected valve 4 all communicates with the unloading port L of energy recovery pump, and is provided with damping on its draining oil circuit to ensure that draining is steady
Pressure.
For ensureing also can realize Variable Control in the case of actuator port B pressure is relatively low, energy recovery pump can also be excellent
Selection of land includes shuttle valve 9 and constant pressure oil source oil-in G, and the first oil-in of shuttle valve 9 communicates with the working oil path of pump motor 2, shuttle valve 9
The second oil-in communicate with constant pressure oil source oil-in G, oil circuit control communicates with the oil-out of shuttle valve 9.Constant pressure oil sources is from G
Mouth introduces the Variable Control for motor operating conditions, it is ensured that the reliability of pump motor 2 work.
Illustrate that the work process of energy recovery pump is as follows with the embodiment shown in Fig. 1 below:
Original state is the displacement of pump, when proportioning valve 6 dead electricity, pump motor 2 are without input speed, and variable cylinder 3
The fluid of inner chamber passes sequentially through pressure shut-off valve 4, load-sensitive flow control valve 5 and connects pressure release with drain tap L, and pump motor 2 leads to
Crossing resetting means 1 promotes swash plate to be in the displacement-a ° of pump.
The acquiescence operating mode of energy recovery pump is pump condition, when proportioning valve 6 dead electricity, pump motor 2 input speed, and pump motor 2
Pumping from hydraulic fluid port S, the pressure oil of pump motor 2 outlet arrives load-sensitive flow control valve 5 and pressure shut-off valve through proportioning valve 6
4, compare pump discharge pressure by load-sensitive flow control valve 5 and regulate swash plate angle with load feedback mouth X feedback pressure difference
Swing in the range of 0～-a °, to meet system flow demand；When pump discharge pressure reach pressure shut-off valve 4 set pressure time,
Pressure shut-off valve 4 commutation is to left position, and regulation oil pump is in minimum injection rate position, no longer output flow, it is ensured that oil pump non-overloading.
The switching operating mode of energy recovery pump is motor operating conditions, when after load feedback mouth X feedback oil circuit pressure release, from actuator port
The hydraulic oil that B is passed through acts on load-sensitive flow control valve 5 through proportioning valve 6 and makes it commutate to left position, therefore through than
The B mouth hydraulic oil of example valve 6 sequentially passes through the inner space of load-sensitive flow control valve 5, pressure shut-off valve 4 and variable cylinder 3 also
Pressure, swash plate will be from negative maximum pendulum angle-a ° pendulum to positive maximum pendulum angle a °, and now energy recovery pump switches to horse from pump condition
Reach operating mode maximum pump discharge state, can be mechanical energy by hydraulic energy transfer.When proportioning valve 6 obtains electric and changes control electric current, coordinate tiltedly
Dish pivot angle feedback spring 7, swash plate pivot angle feedback part 8 can realize swash plate pivot angle and accurately control in the range of positive pivot angle 0～a °
System, to realize motor displacement regulation.Fed back by the swash plate of pump motor 2 position in the range of positive pivot angle, it is achieved that motor work
The discharge capacity ratio of condition controls.
Energy recovery pump of the present invention is applied especially to road running class vehicle or the Brake energy recovery of construction machinery product
Hydraulic system or other potential energy (or inertia energy) energy-recuperation system.
Present invention also offers a kind of road vehicle, it includes above-mentioned energy recovery pump.Due to energy regenerating of the present invention
Pump can use as pump, can use as motor again, and correspondingly, road vehicle of the present invention also has above-mentioned Advantageous effect
Really, do not repeat them here.
Present invention also offers a kind of engineering machinery, it includes above-mentioned energy recovery pump.Due to energy regenerating of the present invention
Pump can use as pump, can use as motor again, and correspondingly, engineering machinery of the present invention also has above-mentioned Advantageous effect
Really, also repeat no more at this.
Above in association with embodiment embodiments of the present invention are described in detail, but the present invention is not limited to be retouched
The embodiment stated.Such as, the proportioning valve 6 of pump motor 2 is placed on load-sensitive flow control valve 5 and the pressure of pump by the present invention program
The arranged in series made above of power stop valve 4, after proportioning valve 6 is placed on load-sensitive flow control valve 5 and pressure shut-off valve 4
Face or centre carry out arranged in series and have same effect.For a person skilled in the art, without departing from the present invention's
These embodiments carry out in the case of principle and connotation multiple change, amendment, equivalence is replaced and modification still falls within
Within protection scope of the present invention.
Claims (11)
1. an energy recovery pump, it is characterised in that including: oil circuit control, pump motor (2) and be used for controlling described pump motor
(2) variable cylinder (3) of swash plate pivot angle, described oil circuit control can change described pump motor to described variable cylinder (3) fuel feeding
(2) swash plate pivot angle, switches realizing described pump motor (2) between pump condition and motor operating conditions.
Energy recovery pump the most according to claim 1, it is characterised in that described pump motor (2) is cam-type axial piston
Variable pump.
Energy recovery pump the most according to claim 1, it is characterised in that it is maximum that described variable cylinder (3) has motor displacement
Travel position (A), zero delivery travel position (D) and pumpage maximum travel position (C)；
Under described pump condition, the travel position of the piston of described variable cylinder (3) is in described zero delivery travel position (D) and institute
State between pumpage maximum travel position (C)；
Under described motor operating conditions, the travel position of the piston of described variable cylinder (3) be in described zero delivery travel position (D) and
Between described motor displacement maximum travel position (A).
Energy recovery pump the most according to claim 1, it is characterised in that also include the ratio being arranged on described oil circuit control
Example valve (6)；
Under described pump condition, described proportioning valve (6) is shown in a fully open operation；
Under described pump motor operating conditions, described proportioning valve (6) can change the described oil circuit control fuel feeding to described variable cylinder (3)
The motor displacement that amount realizes described pump motor (2) is adjustable.
Energy recovery pump the most according to claim 4, it is characterised in that described proportioning valve (6) is electromagnetic proportional valve, described
Electromagnetic proportional valve is shown in a fully open operation when dead electricity.
Energy recovery pump the most according to claim 5, it is characterised in that described oil circuit control is to described variable cylinder (3)
Rodless cavity fuel feeding, the piston rod of described variable cylinder (3) is used for controlling the swash plate pivot angle of described pump motor (2), and described piston rod sets
There is swash plate pivot angle feedback part (8), between described swash plate pivot angle feedback part (8) and described proportioning valve (6), be provided with swash plate pivot angle feedback
Spring (7)；
Under described pump condition, described swash plate pivot angle feedback spring (7) is in pre-pressing state, so that described proportioning valve (6) exists
Electric must be in full-gear under dead electricity；
It is under maximum pump discharge state at described pump motor operating conditions and described pump motor (2), described swash plate pivot angle feedback spring (7)
It is in free state.
Energy recovery pump the most according to claim 1, it is characterised in that also include resetting means (1), at the described dress that resets
Putting under the independent action of (1), described pump motor (2) is in pump displacement.
Energy recovery pump the most according to claim 1, it is characterised in that also include that be arranged on described oil circuit control bears
Carry sensitive flow control valve (5) and pressure shut-off valve (4), the load feedback end end of described load-sensitive flow control valve (5) and
Load feedback mouth (X) communicates, and the control fluid of described oil circuit control is provided by the working oil path of described pump motor (2).
Energy recovery pump the most according to claim 1, it is characterised in that also include shuttle valve (9) and constant pressure oil source oil-in
(G), the first oil-in of described shuttle valve (9) communicates with the working oil path of described pump motor (2), and the second of described shuttle valve (9) enters
Hydraulic fluid port communicates with described constant pressure oil source oil-in (G), and described oil circuit control communicates with the oil-out of described shuttle valve (9).
10. a road vehicle, it is characterised in that include the energy recovery pump described in any one of claim 1～9.
11. 1 kinds of engineering machinery, it is characterised in that include the energy recovery pump described in any one of claim 1～9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610643419.8A CN106089868B (en) | 2016-08-09 | 2016-08-09 | energy recovery pump, road vehicle and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610643419.8A CN106089868B (en) | 2016-08-09 | 2016-08-09 | energy recovery pump, road vehicle and engineering machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106089868A true CN106089868A (en) | 2016-11-09 |
| CN106089868B CN106089868B (en) | 2018-05-18 |
Family
ID=57455413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610643419.8A Active CN106089868B (en) | 2016-08-09 | 2016-08-09 | energy recovery pump, road vehicle and engineering machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106089868B (en) |
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| CN109826836A (en) * | 2019-01-11 | 2019-05-31 | 徐州工业职业技术学院 | A kind of intelligent variable pump and hydraulic control system |
| CN112555236A (en) * | 2020-11-30 | 2021-03-26 | 三一海洋重工有限公司 | Potential energy recovery system, control method thereof and engineering equipment |
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| CN201461362U (en) * | 2009-05-05 | 2010-05-12 | 上海电气液压气动有限公司 | Variable control mechanism of plunger piston variable pump |
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| CN109826836A (en) * | 2019-01-11 | 2019-05-31 | 徐州工业职业技术学院 | A kind of intelligent variable pump and hydraulic control system |
| CN109826836B (en) * | 2019-01-11 | 2020-07-24 | 徐州工业职业技术学院 | Intelligent variable pump and hydraulic control system |
| CN112555236A (en) * | 2020-11-30 | 2021-03-26 | 三一海洋重工有限公司 | Potential energy recovery system, control method thereof and engineering equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106089868B (en) | 2018-05-18 |
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