CN102840192B - System and method for monitoring power of hydraulic system - Google Patents
System and method for monitoring power of hydraulic system Download PDFInfo
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- CN102840192B CN102840192B CN201210216060.8A CN201210216060A CN102840192B CN 102840192 B CN102840192 B CN 102840192B CN 201210216060 A CN201210216060 A CN 201210216060A CN 102840192 B CN102840192 B CN 102840192B
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Abstract
The invention discloses a system and a method for monitoring power of a hydraulic system. The system for monitoring the power of the hydraulic system comprises a first pressure acquisition device, a second pressure acquisition device and a controller, wherein the first pressure acquisition device is used for acquiring a first pressure value at a control oil circuit inlet of a hydraulic control valve in the hydraulic system; the second pressure acquisition device is used for acquiring a second pressure value at an execution oil circuit outlet of the hydraulic control valve in the hydraulic system; and the controller is used for receiving the first pressure value acquired by the first pressure acquisition device and the second pressure value acquired by the second pressure acquisition device, determining the flow rate of an execution oil circuit of the hydraulic control valve according to the first pressure value and determining the power of the hydraulic system according to the flow rate and the second pressure value. According to the system and the method, pressure acquisition units are arranged at the control oil circuit inlet and the execution oil circuit outlet respectively, the power of the hydraulic system is determined according to the pressure values acquired by the pressure acquisition units, the measuring accuracy is higher, and the usage range is wider. In addition, sensors required by the system and the method have a single type and are easy to arrange.
Description
Technical field
The present invention relates to a kind of power monitoring system, particularly a kind of power monitoring system of hydraulic system and method.
Background technique
At present, being generally by arranging temperature transducer and pressure transducer in hydraulic pipe line to the power measurement of hydraulic system, obtaining the temperature change value in pipeline and force value, and according to the hydraulic power in temperature change value and force value determination pipeline.Be specially: at the center line of pipeline to uniform several temperature transducer between tube wall, sounding pipe Lu Zhizheng line is to the temperature variations of tube wall, the velocity field change in pipeline is calculated with this, and according to the flow in velocity field change calculations pipeline and changes in flow rate, pressure in the pipeline recorded in conjunction with pressure transducer again, calculates the hydraulic power in pipeline.
There is following defect in this method of measurement: need to arrange more sensor, and arrangement is complicated.In addition, because the method needs sounding pipe Lu Zhizheng line to the temperature change value of the hydraulic oil of tube wall, this just requires that hydraulic pipe line diameter must be large to certain value, otherwise cannot form obvious temperature difference, inapplicable for the hydraulic pipe line that caliber is less in this way; Further, the in-line of this system and return line can not be connected on same container, otherwise along with the temperature rising of hydraulic oil in container can have impact to the measurement of temperature difference.
Summary of the invention
In view of this, the present invention proposes a kind of power monitoring system and method for hydraulic system, adopts temperature difference to measure to solve in existing power measurement method, is difficult to the problem realized and measuring accuracy is poor.
An aspect, the invention provides a kind of power monitoring system of hydraulic system, comprising: the first pressure acquisition device, for obtaining the first force value of the oil circuit control ingress of hydraulic control valve in this hydraulic system; Second pressure acquisition device, for obtaining second force value in the execution oil circuit outlet port of hydraulic control valve in this hydraulic system; Controller, for receiving the first force value and described second force value, and performs the flow of oil circuit, and determines the power of this hydraulic system according to described flow and described second force value according to described first force value determination hydraulic control valve.
Further, controller comprises flow rate calculation unit, and this flow rate calculation unit comprises further: first module, for the spool travel according to the first force value determination hydraulic control valve; Second unit, for the flow of the execution oil circuit of the spool travel determination hydraulic control valve according to hydraulic control valve.
Further, controller comprises: power determining unit, for the product of the flow of described execution oil circuit and described second force value being defined as the power of this hydraulic system.
Further, above-mentioned power monitoring system also comprises display unit, is electrically connected with controller, and display unit is for receiving and showing the power of the first force value, the second force value and hydraulic system.
Further, in above-mentioned power monitoring system, the first pressure acquisition device is pressure transducer; And/or the second pressure acquisition device is pressure transducer.
Compared with existing measuring device, the power monitoring system of the hydraulic system in the present invention, pressure acquiring unit is arranged respectively in the outlet port of the ingress of oil circuit control and execution oil circuit, the power of the force value determination hydraulic system recorded by pressure acquiring unit, measuring accuracy is higher, and using scope is wider.In addition, the sensor type that the present invention needs is single, is easy to arrange.
On the other hand, the present invention also provides a kind of power monitor method of hydraulic system, and the method comprises the steps: the first pressure obtaining step, obtains the first force value of the oil circuit control ingress of hydraulic control valve in this hydraulic system; Second pressure obtaining step, obtains second force value in the execution oil circuit outlet port of hydraulic control valve in this hydraulic system; Power calculation step, determines the power of this hydraulic system according to the first force value and the second force value.
Further, in above-mentioned power monitor method, power calculation step comprises further: flow rate calculation sub-step, according to the flow of the execution oil circuit of the first force value determination hydraulic control valve; Power calculation sub-step, determines the power of this hydraulic system according to the execution flow of oil circuit and second force value in this execution oil circuit outlet port.
Further, in above-mentioned power monitor method, flow rate calculation sub-step comprises further: according to the spool travel of the first force value determination hydraulic control valve; According to the flow of the execution oil circuit of the spool travel determination hydraulic control valve of hydraulic control valve.
The power monitor method of this hydraulic system is similar to the power monitoring system principle of above-mentioned hydraulic system, and the institute in this way with the power monitoring system of hydraulic system is effective.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is in the power monitoring system embodiment of hydraulic system, the mounting point schematic diagram of pressure acquisition device;
Fig. 2 is in the power monitoring system embodiment of hydraulic system, sectional view when hydraulic control valve spool does not move;
Fig. 3 is in the power monitoring system embodiment of hydraulic system, sectional view during hydraulic control valve spool displacement distance L;
Fig. 4 is the structured flowchart of the power monitoring system embodiment of hydraulic system;
Fig. 5 is in the power monitoring system embodiment of hydraulic system, the structured flowchart of controller;
Fig. 6 is the flow chart of hydraulic system power monitoring method embodiment;
Fig. 7 is in hydraulic system power monitoring method embodiment, the flow chart of power calculation step;
Fig. 8 is in hydraulic system power monitoring method embodiment, the flow chart of flow rate calculation sub-step;
Fig. 9 is the flow chart of hydraulic system power monitoring method preferred embodiment;
Figure 10 is the relation curve between oil circuit control inlet pressure and spool travel.
Description of reference numerals:
1 hydraulic control valve
11 perform oil circuit entrance pipe
12 oil circuit control entrance pipes
121 first pressure acquisition device
13 perform oil circuit export pipeline
131 second pressure acquisition device
14 oil circuit control export pipelines
15 oil circuit control pipelines
16 perform oil circuit pipeline
17 spools
18 valve core cases
The displacement distance of L spool
2 controllers
3 display unit
Embodiment
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
On the one hand, the present invention proposes a kind of power monitoring system of hydraulic system, this monitoring device can carry out on-line measurement to the power of the hydraulic system being provided with hydraulic control valve, below to be provided with the hydraulic system of pilot valve, is described in detail to the preferred embodiment of this monitoring system.
See Fig. 1 to Fig. 5, Fig. 1 is the mounting point schematic diagram of pressure acquisition device in the power monitoring system embodiment of hydraulic system; Fig. 2 is sectional view when hydraulic control valve spool does not move in the power monitoring system embodiment of hydraulic system; Sectional view when Fig. 3 is hydraulic control valve spool displacement distance L in the power monitoring system embodiment of hydraulic system; Fig. 4 is the structured flowchart of the power monitoring system embodiment of hydraulic system; Fig. 5 is in the power monitoring system embodiment of hydraulic system, the structured flowchart of controller.
See Fig. 1 to Fig. 3 and correlation technique known, pilot valve 1 generally comprises valve core case 18 and is located at the spool 17 in valve core case 18.Be processed with oil circuit control pipeline 15 in valve core case 18 and perform oil circuit pipeline 16, being provided with oil circuit control entrance pipe 12, oil circuit control export pipeline 14 at the outer wall of valve core case 18, perform oil circuit entrance pipe 11 and perform oil circuit export pipeline 13.Wherein, oil circuit control entrance pipe 12 is connected with the oil circuit control pipeline 15 in valve core case 18 with oil circuit control export pipeline 14, performs oil circuit entrance pipe 11 and is connected with the execution oil circuit pipeline 16 in valve core case 18 with execution oil circuit export pipeline 13.Spool 17 is arranged on and performs on oil circuit pipeline 16, in oil circuit control pipeline 15 hydraulic oil effect under, spool 17 can along valve core case 18 relative movement, in order to control the flow of the hydraulic oil performed in oil circuit pipeline 16.
From to analyze above and see Figure 10, the displacement of spool 17 is directly proportional to the pressure of hydraulic oil in oil circuit control entrance pipe 12.Be specially: when oil circuit control pressure becomes large, the mobile quantitative change of spool is large, and because spool travel correspondence performs the opening degree of oil circuit, correspondingly, the flow performed in oil circuit becomes large; When oil circuit control pressure diminishes, the amount of movement of spool diminishes, and correspondingly, the flow performed in oil circuit diminishes.The embodiment of the present invention utilizes this characteristic, by the amount of movement of the force value determination spool in Survey control oil circuit entrance pipe, and then determines the flow performing oil circuit, then combines the force value performing oil circuit outlet port, determine the power of this hydraulic system.
Known see Fig. 1 and Fig. 4, the power monitoring system embodiment of this hydraulic system comprises: the first pressure acquisition device 121, for obtaining the first pressure value P 1 of the oil circuit control ingress in this hydraulic system on pilot valve 1; Second pressure acquisition device 131, for obtaining second pressure value P 2 in the execution oil circuit outlet port in this hydraulic system on pilot valve 1; Controller 2, for receiving the first pressure value P 1 and the second pressure value P 2, and performs the flow Q of oil circuit according to the first force value determination hydraulic control valve
v, and according to flow Q
vthe power of this hydraulic system is determined with the second pressure value P 2.Wherein, the first pressure acquisition device 121 is arranged on the ingress of oil circuit control entrance pipe 12, and the second pressure acquisition device 131 is arranged on the outlet port performing oil circuit export pipeline 13.
See Fig. 5, controller 2 comprises flow rate calculation unit, and, flow rate calculation unit comprises further: first module, for receiving the first pressure value P 1, and the oil circuit control inlet pressure of inquiring about this pilot valve be pre-stored in first module according to the first pressure value P 1 with the corresponding relation between spool travel to obtain spool travel L corresponding to this first pressure value P 1; Second unit, receives spool travel L, and determines the flow Q of the execution oil circuit of this pilot valve according to this spool travel L
v.
During specific operation, can installation position displacement sensor on spool in advance, at execution oil circuit ingress setting pressure sensor, the moving displacement of spool is recorded by displacement transducer, record the execution oil circuit pressure at inlet value corresponding to each spool travel by pressure transducer, with the corresponding relation obtaining spool travel and perform between oil circuit pressure at inlet simultaneously.Can determine by this corresponding relation prestored spool travel amount corresponding to the first force value that the first pressure acquisition device obtains, and then determine the flow of execution oil circuit of its correspondence.
In the present embodiment, controller 2 also comprises power determining unit (not shown), for the flow Q by performing oil circuit
vthe power of this hydraulic system is defined as with the product of the second pressure value P 2.
Compared with existing measuring device, the measuring accuracy of the measuring system in the present embodiment is high, and only need selection pressure acquisition device, sensor type is single, is easy to arrange, applied widely.
It should be noted that: the first pressure acquisition device 121 in the present embodiment and the second pressure acquisition device 131 can select existing pressure transducer, and also can select other pressure measuring element, the present invention does not limit its particular type.
In the present embodiment, controller 2 can select PLC, also can select the controller of other types, and the present invention does not limit its particular type.
Continue see Fig. 4, can find out, the present embodiment can further include display unit 3, display unit 3 is electrically connected with controller 2, display unit 3 is for receiving and showing the second pressure value P 2 and the power of this hydraulic system that the first pressure value P 1, second pressure acquisition device 131 that the first pressure acquisition device 121 obtains obtains, so that staff's inquiry.
Compared with existing measuring device, the embodiment of the present invention two pressure acquisition device can complete the power measurement of hydraulic system, and measuring accuracy is higher, and sensor type is single, are easy to arrange.In addition, because this device does not need to measure the temperature change value in pipeline, so stand good for this device of hydraulic pipe line that caliber is less, and, this device does not require that the in-line in hydraulic system and return line are connected on different vessels, simplifies the structure of hydraulic system.
On the other hand, the present invention also proposes a kind of power monitor method of hydraulic system, the method can carry out on-line measurement to the power of the hydraulic system being provided with hydraulic control valve, below to be provided with the hydraulic system of pilot valve, is described in detail to the preferred embodiment of this monitoring method.
See Fig. 6 to Figure 10, Fig. 7 is the flow chart of hydraulic system power monitoring method embodiment; Fig. 7 is in hydraulic system power monitoring method embodiment, the flow chart of power calculation step; Fig. 8 is in the power monitoring system embodiment of hydraulic system, the flow chart of flow rate calculation sub-step; Fig. 9 is the flow chart of the power monitoring system preferred embodiment of hydraulic system; Figure 10 is the relation curve between oil circuit control pressure at inlet and spool travel.
As shown in Figure 6, this monitoring method is embodiment comprise: the first pressure obtaining step, obtains the first pressure value P 1 of the oil circuit control ingress of pilot valve in this hydraulic system; Second pressure obtaining step, obtains second pressure value P 2 in the execution oil circuit outlet port of pilot valve in this hydraulic system; Power calculation step, determines the power P of this hydraulic system according to the first pressure value P 1 and the second pressure value P 2.This monitoring method embodiment can calculate the power of hydraulic system by detection two force value, and method is simple, is easy to realize.
Wherein, see Fig. 7, power calculation step comprises further: flow rate calculation sub-step, determines the flow Q of the execution oil circuit of pilot valve according to the first pressure value P 1
v; Power calculation sub-step, according to the flow Q performing oil circuit
vthe power P of this hydraulic system is determined with second pressure value P 2 in this execution oil circuit outlet port.
Again see Fig. 8, flow rate calculation sub-step comprises again: the first calculation procedure, determines the spool travel L of pilot valve according to the first pressure value P 1; Second calculation procedure, determines the flow of the execution oil circuit of pilot valve according to the spool travel L of pilot valve.
Below in conjunction with Fig. 9, Figure 10, the preferred embodiment of hydraulic system power monitoring method is described further.
First, oil circuit control entrance pipe is installed the first pressure acquisition device, execution oil circuit export pipeline installs the second pressure acquisition device, controller receives the force value that the first pressure acquisition device and the second pressure acquisition device record, and, oil circuit control inlet pressure according to pressure value P 1 query graph 8 of the first pressure acquisition device and the relation curve between spool travel, determine the spool travel L corresponding to this force value, then determine according to this spool travel L the flow Q performing oil circuit
v.Be specially: spool travel L=n1 × P1, wherein, n1 is the slope of pilot valve core displacement and oil circuit control pressure relationship plot; Perform the flow Q of oil circuit
v=n2 × L=n1 × n2 × P1, wherein n2 is spool travel and execution oil circuit discharge relation slope of a curve.Power P=P2 × the Q of hydraulic system
v.
This monitoring method embodiment principle is similar to monitoring device embodiment, and relevant part can cross-reference.
Compared with existing hydraulic system power measurement method, hydraulic system power monitoring method in the present invention, determined the power of hydraulic system by the force value of the oil circuit control ingress and execution oil circuit outlet port that obtain hydraulic control valve in this hydraulic system, method is simple, is easy to realize.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a power monitoring system for hydraulic system, is characterized in that, comprising:
First pressure acquisition device (121), for obtaining the first force value of the oil circuit control ingress of hydraulic control valve in this hydraulic system;
Second pressure acquisition device (131), for obtaining second force value in the execution oil circuit outlet port of hydraulic control valve in this hydraulic system;
Controller (2), for receiving described first force value and described second force value, and determine that this hydraulic control valve performs the flow of oil circuit according to described first force value, and determine the power of this hydraulic system according to the flow of described execution oil circuit and described second force value.
2. the power monitoring system of hydraulic system according to claim 1, is characterized in that, described controller (2) comprises flow rate calculation unit, and this flow rate calculation unit comprises:
First module, for determining the spool travel of described hydraulic control valve according to described first force value;
Second unit, for determining the flow of the execution oil circuit of described hydraulic control valve according to described spool travel.
3. the power monitoring system of hydraulic system according to claim 1, is characterized in that, described controller (2) comprising: power determining unit, for the product of the flow of described execution oil circuit and described second force value being defined as the power of this hydraulic system.
4. the power monitoring system of hydraulic system according to any one of claim 1 to 3, it is characterized in that, also comprise display unit (3), be electrically connected with described controller (2), described display unit (3) is for receiving and show the power of described first force value, described second force value and described hydraulic system.
5. the power monitoring system of hydraulic system according to claim 4, is characterized in that,
Described first pressure acquisition device is pressure transducer; And/or
Described second pressure acquisition device is pressure transducer.
6. a power monitor method for hydraulic system, is characterized in that, comprises the steps:
First pressure obtaining step, obtains the first force value of the oil circuit control ingress of hydraulic control valve in this hydraulic system;
Second pressure obtaining step, obtains second force value in the execution oil circuit outlet port of hydraulic control valve in this hydraulic system;
Power calculation step, determines the power of this hydraulic system according to described first force value and described second force value.
7. the power monitor method of hydraulic system according to claim 6, is characterized in that, described power calculation step comprises further:
Flow rate calculation sub-step, determines the flow of the execution oil circuit of described hydraulic control valve according to described first force value;
Power calculation sub-step, determines the power of this hydraulic system according to the flow of described execution oil circuit and second force value in this execution oil circuit outlet port.
8. the power monitor method of hydraulic system according to claim 7, is characterized in that, described flow rate calculation sub-step comprises further:
First calculation procedure, determines the spool travel of described hydraulic control valve according to described first force value;
Second calculation procedure, determines the flow of the execution oil circuit of described hydraulic control valve according to the spool travel of described hydraulic control valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210216060.8A CN102840192B (en) | 2012-06-28 | 2012-06-28 | System and method for monitoring power of hydraulic system |
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|---|---|---|---|
| CN201210216060.8A CN102840192B (en) | 2012-06-28 | 2012-06-28 | System and method for monitoring power of hydraulic system |
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| CN102840192B true CN102840192B (en) | 2015-03-18 |
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| CN105571754A (en) * | 2016-01-18 | 2016-05-11 | 厦门理工学院 | Energy saving effect on-line testing and evaluation method and system for excavator hydraulic system |
| CN111022393A (en) * | 2019-12-04 | 2020-04-17 | 安徽爱瑞特新能源专用汽车股份有限公司 | Hydraulic station testing fixture |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85105425A (en) * | 1985-07-11 | 1987-01-28 | 浙江大学 | Y-type plug-in electro-hydraulic ratio combination valve |
| US5115684A (en) * | 1989-11-06 | 1992-05-26 | Barmag Ag | Flowmeter for measuring the rate of fluid flow in a conduit |
| EP0530961A1 (en) * | 1991-07-19 | 1993-03-10 | Zexel Corporation | Hydraulic power unit |
| CN1356480A (en) * | 2001-08-14 | 2002-07-03 | 孙玉清 | In-line power monitor method for hydraulic system |
| CN1363508A (en) * | 2001-12-12 | 2002-08-14 | 浙江大学 | Hydraulic system with flow calculation and feedback control for elevator |
| CN101403402A (en) * | 2008-08-12 | 2009-04-08 | 大连海事大学 | Hydraulic system power measurement apparatus based on MEMS plug-in type flow transducer |
-
2012
- 2012-06-28 CN CN201210216060.8A patent/CN102840192B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85105425A (en) * | 1985-07-11 | 1987-01-28 | 浙江大学 | Y-type plug-in electro-hydraulic ratio combination valve |
| US5115684A (en) * | 1989-11-06 | 1992-05-26 | Barmag Ag | Flowmeter for measuring the rate of fluid flow in a conduit |
| EP0530961A1 (en) * | 1991-07-19 | 1993-03-10 | Zexel Corporation | Hydraulic power unit |
| CN1356480A (en) * | 2001-08-14 | 2002-07-03 | 孙玉清 | In-line power monitor method for hydraulic system |
| CN1363508A (en) * | 2001-12-12 | 2002-08-14 | 浙江大学 | Hydraulic system with flow calculation and feedback control for elevator |
| CN101403402A (en) * | 2008-08-12 | 2009-04-08 | 大连海事大学 | Hydraulic system power measurement apparatus based on MEMS plug-in type flow transducer |
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| CN102840192A (en) | 2012-12-26 |
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