CN106499614B - Hydraulic energy-saving system and control method that variable speed electric motors, particularly is matched with variable displacement with constant power pump - Google Patents
Hydraulic energy-saving system and control method that variable speed electric motors, particularly is matched with variable displacement with constant power pump Download PDFInfo
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- CN106499614B CN106499614B CN201610972690.6A CN201610972690A CN106499614B CN 106499614 B CN106499614 B CN 106499614B CN 201610972690 A CN201610972690 A CN 201610972690A CN 106499614 B CN106499614 B CN 106499614B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/002—Hydraulic systems to change the pump delivery
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- Fluid-Pressure Circuits (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The hydraulic energy-saving system and control method matched the invention discloses a kind of variable speed electric motors, particularly with variable displacement with constant power pump, it is characterized in that system includes hydraulic system and control system；Hydraulic system includes variable-frequency motor and the variable displacement with constant power pump coaxially connected with variable-frequency motor；Type selecting is carried out to variable displacement with constant power pump according to the operational characteristic of hydraulic system；The relation between pressure and torque is set up, and obtains the relation of pressure and rotating speed, the pressure value obtained according to collection carries out Discrete control to motor speed.The present invention effectively increases the energy match degree that drive system is loaded with sequential, improves energy-conservation defect of the variable displacement with constant power pump in low-pressure area.
Description
Technical field
The present invention relates to hydraulic system and its control method, further illustrate variable speed electric motors, particularly and matched with variable displacement with constant power pump
Hydraulic energy-saving system and its control method.
Technical background
In industrial production, the hydraulic system using electric energy as power source is damaged due to there is sizable energy in energy transmission
Lose, therefore there is the huge energy saving space, improve hydraulic system system capacity utilization ratio for alleviating energy shortage and subtracting
Few greenhouse effects have great importance.Energy loss in hydraulic system has diversified forms, except each element of system in itself
The energy loss produced due to structure, hydraulic system driver element and bearing power mismatch produced energy loss accounting
Example is bigger.
Improper problem, the eighties in last century are matched for hydraulic system power, Mitsubishi just takes the lead in researching and developing frequency conversion drive
Hydraulic elevator technology, above-mentioned converter technique is mainly used in the control of constant displacement pump, effectively solves hydraulic pressure pump power output
With load demand power matching problem, but the actual energy conversion efficiency of motor and hydraulic pump in itself is have ignored, in industry
The control method of widely used single use variable pump, equally also neglects this problem.
A kind of variable-frequency motor-proportional digital variable pump is disclosed in Publication No. CN104179735A patent application documents
Dual variation method mode, be driven by way of setting up database.But its variable do not probed between motor and pump
And power relation, it is impossible to carry out continuous Self Adaptive Control.Control strategy is obtained by experimental method, is drawn under each operating mode effect
Optimum control point, by test method obtain optimum point, to do substantial amounts of experimental study, add the presence of test error, meeting
So that experiment work amount is increased, and control accuracy is higher, and its tested number is bigger.Control method collection information content is complicated, number
It is tediously long according to handling so that it controls complicated.Every having differences property of hydraulic equipment, the database that lot of experiments is drawn can not be in phase
It is general under same model so that its method becomes difficult in commercial Application, and cost is higher.
The content of the invention
The present invention be for avoid present in above-mentioned prior art not enough there is provided a kind of variable speed electric motors, particularly and variable displacement with constant power pump
The hydraulic energy-saving system and control method of matching, to which the energy match journey that drive system is loaded with sequential can be effectively improved
Degree, simplify control method improves energy-conservation defect of the variable displacement with constant power pump in low-pressure area.
The present invention adopts the following technical scheme that to solve technical problem：
The characteristics of hydraulic energy-saving system that variable speed electric motors, particularly of the present invention is matched with variable displacement with constant power pump is to include：Hydraulic system and
Control system；
The hydraulic system includes the adjustable variable-frequency motor of rotating speed and the invariable power coaxially connected with the variable-frequency motor
Variable pump；The oil inlet of the variable displacement with constant power pump is connected with fuel tank, the oil-out of variable displacement with constant power pump all the way with middle position
The hydraulic fluid port C of the three-position four-way electromagnetic directional valve of unloading function is connected, and another road is connected with the entrance of the first overflow valve, the first overflow
The oil-out of valve is connected with fuel tank；The oil return inlet T of the three-position four-way electromagnetic directional valve is connected with fuel tank, and 3-position 4-way electromagnetism is changed
It is connected to the oil-out A of valve with the rodless cavity of hydraulic cylinder, the oil return opening B of three-position four-way electromagnetic directional valve and going out for the second overflow valve
Hydraulic fluid port is connected, and another road is connected with the oil inlet of check valve；The oil inlet of second overflow valve and the rod chamber phase of hydraulic cylinder
Even；The oil-out of the check valve is connected with the rod chamber of hydraulic cylinder；
The control system is made up of each sensor and controller；The sensor includes being used to detect variable displacement with constant power
The pressure sensor of the outlet pressure of pump, the torque measurer of the output torque for detecting variable-frequency motor, the controller connects
The detection signal from each sensor is received, control signal is provided by data processing for variable-frequency motor by the detection signal.
The characteristics of control method of hydraulic energy-saving system of the present invention is to carry out according to the following procedure：
Step 1：The pressure acted according to the compacting of hydraulic system selectes the constant work(of variable displacement with constant power pump with discharge characteristic
Rate P1, the set pressure p of variable displacement with constant power pump is selected according to the fast drop operating pressure of hydraulic system0；With the firm power P1With
Set pressure p0It is used as the selection gist of variable displacement with constant power pump；
Step 2：Direct proportion coefficient λ is measured as follows0：Change is gathered respectively using torque measurer and pressure sensor
The torque T of the frequency motor and outlet pressure p of variable displacement with constant power pump, the time of hydraulic system is formulated according to torque T and outlet pressure p
T and torque T relation curve T=x (t), and time t and outlet pressure p relation curve p=y (t), according to relation curve,
Conversion draws T=λiP, i=1,2,3 ..., to λiTaking is worth λ0；
Step 3：The Discrete control in variable displacement with constant power pump non-invariable power stage and invariable power stage is realized as follows：
If p<p0, the rotating speed n of variable-frequency motor is set1For：n1=q/V, V are the maximum pump discharge of variable displacement with constant power pump, and q is stream
Amount, flow q is process set value；
If p >=p0, the rotating speed n of variable-frequency motor is set2For：
Compared with the prior art, the present invention has the beneficial effect that：
1st, energy-saving effect of the present invention is mainly reflected in the energy match and invariable power of variable displacement with constant power pump and sequential load
The energy match of variable pump and variable-frequency motor.The energy match that constant output pump is loaded with sequential is mainly reflected in system can basis
System pressure, the change of flow and export matching flow, pressure, so as to reach the purpose of energy-conservation；Variable displacement with constant power pump
The power output for being embodied in motor with the energy match of variable-frequency and variable-speed motor passes to pump as far as possible so that the machinery of pump
Loss is minimum with volumetric loss.
2nd, for traditional variable speed electric motors, particularly and variable pump, the factor for influenceing it to change is a lot, and intercouples, in non-thread
Property, time variation the features such as so that system control it is extremely difficult, it is difficult to set up accurate mathematical modeling.The present invention is using speed change electricity
Machine and constant output pump system, by way of introducing a proportionality coefficient, draw the relation of torque and pressure, so as to obtain one
Model is accurately controlled, may be such that system high efficiency rate is transported by gathering the outlet pressure controlled motor rotating speed of variable displacement with constant power pump
OK, its control mode is simple, and cost is low.
3rd, the present invention combines the processing technology of hydraulic system, the pressure gathered by controller to variable displacement with constant power pump discharge
The size for the pressure value that value is set with variable displacement with constant power pump is judged, and carries out Discrete control to motor speed based on this, this
The real-time control system of combined process is planted, energy-conservation defect of the variable displacement with constant power pump in low-pressure area is improved.
Brief description of the drawings
Fig. 1 is that present system constitutes schematic diagram；
Label in figure：1 variable-frequency motor, 2 variable displacement with constant power pumps, 3 fuel tanks, 4 three-position four-way electromagnetic directional valves, 5 first overflows
Valve, 6 hydraulic cylinders, 7 second overflow valves, 8 check valves, 9 controllers, 10 torque measurers, 11 pressure sensors.
Embodiment
Referring to Fig. 1, the hydraulic energy-saving system that variable speed electric motors, particularly is matched with variable displacement with constant power pump in the present embodiment includes hydraulic pressure system
System and control system.
Hydraulic system includes the adjustable variable-frequency motor 1 of rotating speed and the variable displacement with constant power pump coaxially connected with variable speed electric motors, particularly 1
2；The oil inlet of variable displacement with constant power pump 2 is connected with fuel tank 3, the oil-out of variable displacement with constant power pump 2 all the way with middle position off-load work(
The hydraulic fluid port C of the three-position four-way electromagnetic directional valve 4 of energy is connected, and another road is connected with the entrance of the first overflow valve 5, the first overflow valve 5
Oil-out be connected with fuel tank 3；The oil return inlet T of three-position four-way electromagnetic directional valve 4 is connected with fuel tank 3,3-position 4-way electromagnetic switch
The oil-out A of valve 4 is connected with the rodless cavity of hydraulic cylinder 6, the oil return opening B of three-position four-way electromagnetic directional valve 4 and the second overflow valve 7
Oil-out is connected, and another road is connected with the oil inlet of check valve 8；The oil inlet of second overflow valve 7 and the rod chamber phase of hydraulic cylinder 6
Even；The oil-out of check valve 8 is connected with the rod chamber of hydraulic cylinder 6.
After variable speed electric motors, particularly 1 starts, set three-position four-way electromagnetic directional valve 4 in left position, hydraulic oil is into hydraulic cylinder 6 without bar
Chamber, hydraulic cylinder piston rod is descending until bottom, sets three-position four-way electromagnetic directional valve 4 in right position, hydraulic oil enters hydraulic pressure afterwards
The rod chamber of cylinder 6, hydraulic cylinder piston rod is up until top.The left position of three-position four-way electromagnetic directional valve 4 refers to：Oil inlet C and oil
Mouth A is communicated, and hydraulic fluid port B is communicated with oil return inlet T；The right position of three-position four-way electromagnetic directional valve 4 refers to：Oil inlet C is communicated with hydraulic fluid port B, oil
Mouth A is communicated with oil return opening C.
Control system is made up of each sensor and controller 9；Sensor includes being used to detect going out for variable displacement with constant power pump 2
The pressure sensor 11 of mouth pressure, the torque measurer 10 of the output torque for detecting variable-frequency motor 1, controller is received and come from
The detection signal of each sensor, control signal is provided by detection signal by data processing for variable-frequency motor.
The control method of hydraulic energy-saving system is to carry out according to the following procedure in the present embodiment：
Step 1：The pressure acted according to the compacting of hydraulic system selectes the constant work(of variable displacement with constant power pump 2 with discharge characteristic
Rate P1, the set pressure p of variable displacement with constant power pump 2 is selected according to the fast drop operating pressure of hydraulic system0；With firm power P1And tune
Constant-pressure p0It is used as the selection gist of variable displacement with constant power pump 2.
Variable displacement with constant power pump is not up to setting p in pressure0Before, be the equal of maximum pump discharge V constant displacement pump, in pressure
Reach after steady state value, during its flow pressure value changes, it then follows invariable power, its value size is P2.By the work(of variable displacement with constant power pump
Rate characteristic is combined with hydraulic system operational characteristic, realizes the segmentation control in variable displacement with constant power pump non-invariable power stage and invariable power stage
System.
Operational characteristic on hydraulic system：During hydraulic work system, there is fast drop action, compacting action, protect
Press work and return to action, it is small that fast drop acts and returned to operating duty pressure, and responsiveness and operating pressure are by technological requirement
It is determined that, flow pressure size is determined, variable displacement with constant power pump and matching for loading are realized using variable speed electric motors, particularly speed governing；Compacting action,
Pressurize is acted and slow reverse makees load pressure greatly, and load value is changeable so that power match is difficult, also causes control mode complicated
And not precisely, using variable displacement with constant power pump, during its flow pressure value changes, it then follows invariable power so that pump is matched most with load
Bigization, and cause by variable speed electric motors, particularly speed governing the power match of power of motor and variable displacement with constant power pump.
Step 2：Direct proportion coefficient λ is measured as follows0：Adopted respectively using torque measurer 10 and pressure sensor 11
Collect the torque T of variable-frequency motor 1 and the outlet pressure p of variable displacement with constant power pump 2, hydraulic system is formulated according to torque T and outlet pressure p
Time t and torque T relation curve T=x (t), and time t and outlet pressure p relation curve p=y (t), according to pass
It is curve, conversion draws T=λiP, i=1,2,3 ..., to λiTaking is worth λ0。
Direct proportion coefficient λ0The purpose of introducing is the physical relationship established between pump discharge pressure p and motor torque T, motor
Torque and pump discharge pressure are changed with the outer load change of hydraulic system.It is intermediate conversion amount, root by motor torque
According to the power of motor energy match principle equal with pump power, the definite relation between pump discharge pressure and rotating speed is obtained.
Step 3：The Discrete control in variable displacement with constant power pump non-invariable power stage and invariable power stage is realized as follows：
If p<p0, the rotating speed n of variable-frequency motor 1 is set1For：n1=q/V, V are the maximum pump discharge of variable displacement with constant power pump 2, and q is
Flow, flow q is process set value；
If p >=p0, the rotating speed n of variable-frequency motor 1 is set2For：
By Discrete control, energy-conservation defect of the variable displacement with constant power pump in low-pressure area is improved, variable speed electric motors, particularly-perseverance work(is realized
The accurate real-time control of rate variable pump.
Claims (2)
1. the hydraulic energy-saving system that a kind of variable speed electric motors, particularly is matched with variable displacement with constant power pump, it is characterized in that including：Hydraulic system and control
System processed；
The hydraulic system includes the adjustable variable-frequency motor of rotating speed (1) and the permanent work(coaxially connected with the variable-frequency motor (1)
Rate variable pump (2)；The oil inlet of the variable displacement with constant power pump (2) is connected with fuel tank (3), the oil-out of variable displacement with constant power pump (2)
The hydraulic fluid port C with the three-position four-way electromagnetic directional valve (4) with middle position unloading function is connected all the way, another road and the first overflow valve
(5) entrance is connected, and the oil-out of the first overflow valve (5) is connected with fuel tank (3)；The three-position four-way electromagnetic directional valve (4)
Oil return inlet T is connected with fuel tank (3), and the oil-out A of three-position four-way electromagnetic directional valve (4) is connected with the rodless cavity of hydraulic cylinder (6), and three
The oil return opening B of position four-way electromagnetic reversing valve (4) is connected with the oil-out of the second overflow valve (7), and another road is entered with check valve (8)
Hydraulic fluid port is connected；The oil inlet of second overflow valve (7) is connected with the rod chamber of hydraulic cylinder (6)；The check valve (8) it is fuel-displaced
Mouth is connected with the rod chamber of hydraulic cylinder (6)；
The control system is made up of each sensor and controller (9)；The sensor includes being used to detect variable displacement with constant power
The pressure sensor (11) of the outlet pressure of pump (2), the torque measurer of the output torque for detecting variable-frequency motor (1)
(10), the controller receives the detection signal from each sensor, and it is variable-frequency electric that the detection signal is passed through into data processing
Machine (1) provides control signal, and the adjustable variable-frequency motor of rotating speed (1) is variable speed electric motors, particularly.
2. the control method of hydraulic energy-saving system described in a kind of claim 1, it is characterized in that carrying out according to the following procedure：
Step 1：The pressure acted according to the compacting of hydraulic system selectes the firm power of variable displacement with constant power pump (2) with discharge characteristic
P1, the set pressure p of variable displacement with constant power pump (2) is selected according to the fast drop operating pressure of hydraulic system0；With the firm power P1
With set pressure p0It is used as the selection gist of variable displacement with constant power pump (2)；
Step 2：Direct proportion coefficient λ is measured as follows0：Adopted respectively using torque measurer (10) and pressure sensor (11)
Collect the torque T of variable-frequency motor (1) and the outlet pressure p of variable displacement with constant power pump (2), hydraulic pressure is formulated according to torque T and outlet pressure p
The time t and torque T of system relation curve T=x (t), and time t and outlet pressure p relation curve p=y (t), root
According to relation curve, conversion draws T=λiP, i=1,2,3 ..., to λiTaking is worth λ0；
Step 3：The Discrete control in variable displacement with constant power pump non-invariable power stage and invariable power stage is realized as follows：
If p<p0, the rotating speed n of variable-frequency motor (1) is set1For：n1=q/V, V are the maximum pump discharge of variable displacement with constant power pump (2), and q is
Flow, flow q is process set value；
If p >=p0, the rotating speed n of variable-frequency motor (1) is set2For：
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| CN107420378B (en) * | 2017-06-28 | 2018-12-11 | 合肥工业大学 | A kind of hydraulic press drive system matching power save mode |
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| DE102019206315A1 (en) * | 2019-05-03 | 2020-11-05 | Robert Bosch Gmbh | Method and control circuit for regulating a pressure medium supply for a hydraulic actuator |
| CN110242531B (en) * | 2019-06-14 | 2020-11-10 | 合肥工业大学 | Energy-saving control method for constant-power plunger variable pump set driving system |
| CN110566447B (en) * | 2019-10-25 | 2020-06-30 | 青岛中加特电气股份有限公司 | Variable frequency speed regulation control method and control device for pump |
| WO2021109573A1 (en) | 2019-12-04 | 2021-06-10 | 合肥工业大学 | Method for designing energy servitization system and shared drive system of multi-machine production line |
| CN110968059B (en) * | 2019-12-04 | 2020-10-02 | 合肥工业大学 | Design method of multi-machine sharing drive system of production line |
| CN112901438A (en) * | 2020-12-30 | 2021-06-04 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Electric control type constant power electric pump |
| CN114508483B (en) * | 2022-02-28 | 2023-05-16 | 华侨大学 | Power adjusting system and adjusting method of hydraulic pump |
| CN114645842A (en) * | 2022-04-19 | 2022-06-21 | 无锡市钻通工程机械有限公司 | Efficient matching control method for variable speed motor and high-power variable pump |
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| JP3639754B2 (en) * | 1999-09-24 | 2005-04-20 | ダイキン工業株式会社 | Hydraulic device |
| JP2006124145A (en) * | 2004-11-01 | 2006-05-18 | Mitsubishi Heavy Ind Ltd | Hydraulic device for battery type industrial vehicle |
| JP2012021448A (en) * | 2010-07-14 | 2012-02-02 | Mitsubishi Heavy Ind Ltd | Hydraulic unit for industrial machine |
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| CN1821574A (en) * | 2006-03-07 | 2006-08-23 | 太原理工大学 | Low idling energy consumption hydraulic power source |
| CN102493953A (en) * | 2012-01-05 | 2012-06-13 | 三一汽车起重机械有限公司 | Energy-saving control system, truck crane and energy-saving control method |
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