CN103671308A - Hydraulic control equipment, method and system and engineering machinery - Google Patents
Hydraulic control equipment, method and system and engineering machinery Download PDFInfo
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- CN103671308A CN103671308A CN201310684819.XA CN201310684819A CN103671308A CN 103671308 A CN103671308 A CN 103671308A CN 201310684819 A CN201310684819 A CN 201310684819A CN 103671308 A CN103671308 A CN 103671308A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 36
- 239000003921 oil Substances 0.000 claims abstract description 30
- 238000006073 displacement reaction Methods 0.000 claims description 12
- 239000012530 fluid Substances 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 3
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- 150000001875 compounds Chemical class 0.000 description 1
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Abstract
The invention discloses a hydraulic control device, a method, a system and an engineering machine, wherein a hydraulic pump drives hydraulic oil to flow into an oil cylinder through an electromagnetic valve so as to drive a piston in the oil cylinder to move, the hydraulic control device comprises: the receiving device is used for receiving the temperature of the hydraulic oil flowing through the electromagnetic valve and the target moving speed of the piston; and a control device that controls a control current applied to the solenoid valve so that the moving speed of the piston satisfies a target moving speed, based on the temperature and the target moving speed. Through this technical scheme, can realize the accurate control of hydro-cylinder piston based on temperature compensation to the influence that different oil temperatures caused the circulation flow of solenoid valve port is adapted to.
Description
Technical field
The present invention relates to hydraulic control field, particularly, the engineering machinery that relates to a kind of hydraulic-pressure control apparatus, hydraulic control method, hydraulic control system and use this system.
Background technique
Fig. 1 is the structural representation of existing hydraulic system.As shown in Figure 1, this hydraulic system comprises pump, solenoid valve, oil cylinder and controller, and pump can pump into described oil cylinder via described solenoid valve by hydraulic oil, and then drives this in-oil cylinder piston movement.The size of current that controller can input to solenoid valve by controlling it, thus the aperture of this solenoid valve controlled, and then control the flow that flows into described in-oil cylinder hydraulic oil, thus the movement velocity of control piston.
Yet, in actual application, often there will be this situation,, in the situation that to input to the size of current of solenoid valve certain, it is constant that the movement velocity of piston can not keep, thereby be difficult to control exactly speed and the displacement of oil cylinder piston.
Summary of the invention
The engineering machinery that the object of this invention is to provide a kind of hydraulic-pressure control apparatus, hydraulic control method, hydraulic control system and use this system, it can control the travelling speed of oil cylinder piston exactly.
To achieve these goals, the invention provides a kind of hydraulic-pressure control apparatus, wherein hydraulic pump drive hydraulic oil flows into described oil cylinder through solenoid valve, to drive described in-oil cylinder piston to move, this equipment comprises: reception unit, for receiving the temperature of hydraulic oil and the target travelling speed of described piston of the described solenoid valve of flowing through; And control gear, based on described temperature and target travelling speed, control the control electric current that is applied to described solenoid valve, so that the travelling speed of described piston meets described target travelling speed.
Correspondingly, the present invention also provides a kind of hydraulic control system, and this system comprises: temperature-detecting device, for detection of the temperature of the hydraulic oil of the solenoid valve valve port of flowing through; And above-mentioned hydraulic-pressure control apparatus.
Correspondingly, the present invention also provides a kind of engineering machinery, and this project machinery comprises above-mentioned hydraulic control system.
Correspondingly, the present invention also provides a kind of hydraulic control method, wherein hydraulic pump drive hydraulic oil flows into described oil cylinder through solenoid valve, and to drive described in-oil cylinder piston to move, the method comprises: the temperature of hydraulic oil and the target travelling speed of described piston that receive the described solenoid valve of flowing through; And based on described temperature and target travelling speed, control the control electric current that is applied to described solenoid valve, so that the travelling speed of described piston meets described target travelling speed.
Inventor is through studying discovery for a long period of time, and in cylinder movement process, the temperature of hydraulic oil can change, thereby causes hydraulic pressure oil viscosity to change.Temperature range at hypothesis hydraulic oil is 0-100 ℃, and in this temperature range, the peak viscosity of hydraulic oil is 460mm
2/ s, minimal viscosity is 5mm
2/ s, viscosity changes greatly.Viscosity variation meeting affects to the Flow characteristics of valve port, cause the circulation flow of solenoid valve valve port to change, thereby existing hydraulic control mode is difficult to control exactly speed and the displacement of oil cylinder piston.Based on this, find, inventor has proposed such scheme, and by this technological scheme, the oil cylinder piston that can realize based on temperature correction is accurately controlled, the impact circulation flow of solenoid valve valve port being caused to adapt to different oil temperatures.
Other features and advantages of the present invention partly in detail are described the embodiment subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for specification, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the structural representation of existing hydraulic system;
Fig. 2 is the structural representation of hydraulic control system provided by the invention; And
Fig. 3 is the flow chart of a concrete control procedure of hydraulic control system provided by the invention.
Description of reference numerals
10 pump 20 solenoid valves
30 oil cylinder 31 pistons
40 controller 50 temperature-detecting devices
100 control apparatus 110 reception units
120 control gear
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
Fig. 2 is the structural representation of hydraulic control system provided by the invention.As shown in Figure 2, hydraulic control system provided by the invention comprises: temperature-detecting device, for detection of the temperature of the hydraulic oil of the solenoid valve valve port of flowing through; And hydraulic-pressure control apparatus, this equipment comprises: reception unit, for receiving the temperature of hydraulic oil and the target travelling speed of described piston of the described solenoid valve of flowing through; And control gear, based on described temperature and target travelling speed, control the control electric current that is applied to described solenoid valve, so that the travelling speed of described piston meets described target travelling speed.By this, can realize that accurate travelling speed under identical hydraulic fluid temperature is controlled and different hydraulic fluid temperature under the accurate travelling speed with temperature correction control.
Wherein, described control gear is controlled the control electric current that is applied to described solenoid valve based on following formula:
Wherein, the travelling speed that v is piston, K is fixed coefficient value, f
temperature(T) be the function based on temperature T, υ is the viscosity of hydraulic oil under a reference temperature, f
flow(i) be the cross-section area and the function of controlling current i, the density that ρ is hydraulic oil, Δ of solenoid valve valve port
pfor hydraulic oil is through the pressure difference before and after thin wall small hole, A
1for the lifting surface area of oil cylinder with respect to hydraulic oil.
Below introduce the derivation of above-mentioned formula:
First, through the flow of solenoid valve valve port, can be reduced to the flow formula of the thin wall small hole of flowing through:
Wherein, Q is the flow of solenoid valve valve port of flowing through; C
dfor aperture flow coefficient; A is the cross-section area of solenoid valve valve port, and it exists a function relation with control current i; ρ is the density of hydraulic oil; Δ
pfor hydraulic oil is through the pressure difference before and after thin wall small hole.
A=f
flow(i) (2)
C
d=K * f
temperature(T) * υ (3)
Wherein, K is fixed coefficient value, f
temperature(T) be the function based on temperature T, υ is the viscosity of hydraulic oil under a reference temperature, and this formula (3) can obtain based on laboratory data matching.
Described A
1can be the rod chamber of oil cylinder or the lifting surface area of rodless cavity, itself and piston movement speed v can meet following formula with the flow Q of the solenoid valve valve port of flowing through:
Q=v×A
1 （4）
According to above-mentioned formula (1)-(4), can derive following equation, based on hydraulic fluid temperature T and be applied to the formula of cylinder piston motion speed v of the control current i of solenoid valve:
By this formula (5), can be in actual control procedure, according to hydraulic fluid temperature, change, draw oil cylinder piston target speed and be applied to the relation between the control electric current of solenoid valve, thereby the controlled quentity controlled variable of compensation electromagnetic valve, the cylinder piston motion speed realizing based on temperature correction is accurately controlled.
Fig. 3 is the flow chart of a concrete control procedure of hydraulic control system provided by the invention.As shown in Figure 3, described control gear can determine that the hydraulic fluid temperature under described hydraulic fluid temperature is interval, and determines with control current function the control electric current that is applied to described solenoid valve according to described target travelling speed and the speed corresponding with described temperature range.By this, can realize and simplify the object of calculating.
Fig. 3 show respectively hydraulic fluid temperature T 0-10 ℃, 10-20 ℃, 20-30 ℃ ..., at 90-100 ℃, piston movement speed v and be applied to the function relation between the control current i of described solenoid valve, i.e. v=f
1(i), v=f
2(i), v=f
3(i) ..., v=f
n(i), after distortion, be i=g
1(v), i=g
2(v), i=g
2(v) ..., i=g
n(v).Formula based on after this distortion, can draw the control current i that is applied to described solenoid valve, thereby apply this electric current to solenoid valve, so that the travelling speed of described piston meets described target travelling speed.
Preferably, described reception unit is also for receiving the current travelling speed of described piston; And described control gear is also for comparing described current travelling speed and described target travelling speed, and in the situation that the difference of described current travelling speed and described target travelling speed surpasses preset range, based on described temperature and target travelling speed, control is applied to the control electric current of described solenoid valve, so that the travelling speed of described piston meets described target travelling speed.By this, can on the impact of oil cylinder piston, exceed tolerance in the situation that hydraulic fluid temperature changes, implement temperature correction, improve cylinder piston motion velocity control accuracy.
Optionally, described reception unit also can receive the displacement of targets of described piston; Described control gear also can in the situation that make the travelling speed of described piston meet described target travelling speed, be controlled to the application time of the control electric current of described solenoid valve, so that the displacement of described piston meets described displacement of targets.The displacement that can realize under different temperatures by this, is accurately controlled.
Correspondingly, the present invention also provides a kind of engineering machinery, and this project machinery comprises above-mentioned hydraulic control system.
Correspondingly, the present invention also provides a kind of hydraulic control method, wherein hydraulic pump drive hydraulic oil flows into described oil cylinder through solenoid valve, and to drive described in-oil cylinder piston to move, the method comprises: the temperature of hydraulic oil and the target travelling speed of described piston that receive the described solenoid valve of flowing through; And based on described temperature and target travelling speed, control the control electric current that is applied to described solenoid valve, so that the travelling speed of described piston meets described target travelling speed.Identical about the detail of the method and benefit and above-mentioned control system, repeats no more in this.
Below describe by reference to the accompanying drawings the preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in above-mentioned mode of execution; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technological scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition each the concrete technical characteristics described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode.For fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible compound modes.
In addition, between various mode of execution of the present invention, also can carry out combination in any, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (12)
1. a hydraulic-pressure control apparatus, wherein hydraulic pump drive hydraulic oil flows into described oil cylinder through solenoid valve, to drive described in-oil cylinder piston to move, it is characterized in that, and this equipment comprises:
Reception unit, for receiving the temperature of hydraulic oil and the target travelling speed of described piston of the described solenoid valve of flowing through; And
Control gear, based on described temperature and target travelling speed, controls the control electric current that is applied to described solenoid valve, so that the travelling speed of described piston meets described target travelling speed.
2. equipment according to claim 1, is characterized in that, described control gear is controlled the control electric current that is applied to described solenoid valve based on following formula:
Wherein, the travelling speed that v is piston, K is fixed coefficient value, f
temperature(T) be the function based on temperature T, υ is the viscosity of hydraulic oil under a reference temperature, f
flow(i) be the cross-section area and the function of controlling current i, the density that ρ is hydraulic oil, Δ of solenoid valve valve port
pfor hydraulic oil is through the pressure difference before and after thin wall small hole, A
1for the lifting surface area of oil cylinder with respect to hydraulic oil.
3. equipment according to claim 1, it is characterized in that, described control gear is used for determining that the hydraulic fluid temperature under described hydraulic fluid temperature is interval, and determines with control current function the control electric current that is applied to described solenoid valve according to described target travelling speed and the speed corresponding with described temperature range.
4. according to the equipment described in any one claim in claim 1-3, it is characterized in that,
Described reception unit is also for receiving the current travelling speed of described piston; And
The in the situation that described control gear surpassing preset range for the difference in described current travelling speed and described target travelling speed, based on described temperature and target travelling speed, control is applied to the control electric current of described solenoid valve, so that the travelling speed of described piston meets described target travelling speed.
5. according to the equipment described in any one claim in claim 1-3, it is characterized in that,
Described reception unit is also for receiving the displacement of targets of described piston;
Described control gear also for should before travelling speed and described target travelling speed compare, and in the situation that make the travelling speed of described piston meet described target travelling speed, control to the application time of the control electric current of described solenoid valve, so that the displacement of described piston meets described displacement of targets.
6. a hydraulic control system, is characterized in that, this system comprises:
Temperature-detecting device, for detection of the temperature of the hydraulic oil of the solenoid valve valve port of flowing through; And
According to the control apparatus described in any one claim in claim 1-5.
7. an engineering machinery, is characterized in that, this project machinery comprises hydraulic control system according to claim 6.
8. a hydraulic control method, wherein hydraulic pump drive hydraulic oil flows into described oil cylinder through solenoid valve, to drive described in-oil cylinder piston to move, it is characterized in that, and the method comprises:
Reception the flow through temperature of hydraulic oil and the target travelling speed of described piston of described solenoid valve; And
Based on described temperature and target travelling speed, control the control electric current that is applied to described solenoid valve, so that the travelling speed of described piston meets described target travelling speed.
9. method according to claim 8, is characterized in that, controls the control electric current that is applied to described solenoid valve based on following formula:
Wherein, the travelling speed that v is piston, K is fixed coefficient value, f
temperature(T) be the function based on temperature T, υ is the viscosity of hydraulic oil under a reference temperature, f
flow(i) be the cross-section area and the function of controlling current i, the density that ρ is hydraulic oil, Δ of solenoid valve valve port
pfor hydraulic oil is through the pressure difference before and after thin wall small hole, A
1for the lifting surface area of oil cylinder with respect to hydraulic oil.
10. method according to claim 8, is characterized in that, the control electric current that control is applied to described solenoid valve comprises:
Determine that the hydraulic fluid temperature under described hydraulic fluid temperature is interval, and determine with control current function the control electric current that is applied to described solenoid valve according to described target travelling speed and the speed corresponding with described temperature range.
Method in 11. according to Claim 8-10 described in any one claim, is characterized in that, the method also comprises:
Receive the current travelling speed of described piston; And
Should before travelling speed and described target travelling speed compare,
Describedly based on described temperature and target travelling speed, control and be applied to the control electric current of described solenoid valve and be performed over preset range in the situation that in the difference of described current travelling speed and described target travelling speed so that the travelling speed of described piston meets described target travelling speed.
Method in 12. according to Claim 8-10 described in any one claim, is characterized in that, the method also comprises:
Receive the displacement of targets of described piston; And
In the situation that make the travelling speed of described piston meet described target travelling speed, control to the application time of the control electric current of described solenoid valve, so that the displacement of described piston meets described displacement of targets.
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| CN201310684819.XA CN103671308B (en) | 2013-12-12 | 2013-12-12 | Hydraulic control equipment, method and system and engineering machinery |
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|---|---|---|---|
| CN201310684819.XA CN103671308B (en) | 2013-12-12 | 2013-12-12 | Hydraulic control equipment, method and system and engineering machinery |
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| CN103671308A true CN103671308A (en) | 2014-03-26 |
| CN103671308B CN103671308B (en) | 2016-07-20 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106402092A (en) * | 2016-12-15 | 2017-02-15 | 中联重科股份有限公司 | Piston position detection equipment and method for telescopic oil cylinder and engineering machinery |
| CN106499680A (en) * | 2016-10-13 | 2017-03-15 | 长沙中联消防机械有限公司 | For the control device of assignment of traffic, method, hydraulic system and engineering machinery |
| CN106838431A (en) * | 2016-12-22 | 2017-06-13 | 中联重科股份有限公司 | Control equipment, method and system for electromagnetic valve and engineering machinery |
| CN108496012A (en) * | 2016-02-18 | 2018-09-04 | Ｋｙｂ株式会社 | The control device of fluid pressure actuated device |
| CN110586656A (en) * | 2019-09-04 | 2019-12-20 | 鞍钢股份有限公司 | Method for ensuring accurate positioning of baffle cylinder of coil splitting line temper mill |
| CN111984053A (en) * | 2020-08-24 | 2020-11-24 | 三一重机有限公司 | Pressure reducing valve current compensation method and device, electronic equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110586656A (en) * | 2019-09-04 | 2019-12-20 | 鞍钢股份有限公司 | Method for ensuring accurate positioning of baffle cylinder of coil splitting line temper mill |
| CN111984053A (en) * | 2020-08-24 | 2020-11-24 | 三一重机有限公司 | Pressure reducing valve current compensation method and device, electronic equipment and storage medium |
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| CN103671308B (en) | 2016-07-20 |
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