CN104314927A - Load-sensitive hydraulic control system and method and engineering machine - Google Patents
Load-sensitive hydraulic control system and method and engineering machine Download PDFInfo
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- CN104314927A CN104314927A CN201410538529.9A CN201410538529A CN104314927A CN 104314927 A CN104314927 A CN 104314927A CN 201410538529 A CN201410538529 A CN 201410538529A CN 104314927 A CN104314927 A CN 104314927A
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- load
- force value
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- control pump
- difference
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Classifications
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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
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/30—Control parameters, e.g. input parameters
- F05B2270/301—Pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/30—Control parameters, e.g. input parameters
- F05B2270/301—Pressure
- F05B2270/3013—Outlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/30—Control parameters, e.g. input parameters
- F05B2270/337—Electrical grid status parameters, e.g. voltage, frequency or power demand
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a load-sensitive hydraulic control system and method and an engineering machine. The load-sensitive hydraulic control system comprises an electric control pump, a load-sensitive valve, a first pressure sensor, a second pressure sensor and a controller, wherein an oil inlet of the load-sensitive valve is connected with an oil outlet of the electric control pump; the first pressure sensor is used for measuring a first pressure value of the oil outlet of the electric control pump; the second pressure sensor is used for measuring a second pressure value of a load pressure feedback opening of the load-sensitive valve; the controller is used for adjusting input current of the electric control pump according to a difference value of the first pressure value and the second pressure value, so that the difference value of the first pressure value and the second pressure value is equal to a predetermined difference value. The control system can be applied to a hydraulic system including the electric control valve and the load-sensitive valve, and the universality for use of the load-sensitive hydraulic control system is improved.
Description
Technical field
The present invention relates to technical field of engineering machinery, particularly a kind of load sensing hydraulic control system and method and engineering machinery.
Background technique
Load sensitive system is that one experiences system pressure-traffic demand, and only provides the oil hydraulic circuit of required flow and pressure.The power loss of load sensitive control system is lower, and efficiency is far above conventional hydraulic system.High efficiency, power loss be little means the saving of fuel and the lower heating value of hydraulic system.Load sensing control technique is applied to the transmission and control system that construct a kind of future, and its efficient feature makes Ioad-sensing control become the ideal design of all transmissions and control system.Load sensitive system is that in hydraulic drive and control field innovates technologies, and has been widely used in the hydraulic system of vehicle, engineering machinery and other machinery.
Under normal circumstances, load-sensitive hydraulic system is mainly load sensitive pump (being generally load-sensing formula plunger pump) and joins load-sensitive valve, load sensitive system has the closed-loop system of Pressure difference feedback, can realize the servo antrol of pump to induced pressure under flow instruction condition.Load sensitive system is exactly that making load sensitive pump export one needs bigger pressure than load, and its difference is set by the spring of load-sensitive valve by the pressure feedback of load on load sensitive pump.When load reduces, the pressure that load sensitive pump exports fluid reduces, and this reduces the consumption of the energy, very energy-conservation.This system not only can ensure Auto-matching needed for the pressure of oil hydraulic pump and load, and can the speed of accurate control load.Because pressure-compensated valve can ensure that pressure reduction before and after selector valve (i.e. the difference of pump discharge pressure and induced pressure) is constant, the flow of pump is only determined by the openings of sizes of selector valve, has nothing to do with induced pressure.
Present inventor finds: load-sensitive hydraulic system can only be coordinated load-sensitive valve to use by load sensitive pump substantially, which results in the narrow limitation that this load-sensitive hydraulic system uses.And regulated by throttle valve between load-reacting delivery side of pump to load, the pressure reduction of throttle valve rear and front end is the flow control input signal of this pump.Although carried out the output flow of control pump by the cross-section area size changing throttle orifice, this method easy responsive to load variable displacement pump causes certain loss.
Summary of the invention
In order to overcome the confinement problems that existing load-sensitive hydraulic system can only be coordinated load-sensitive valve to use by load sensitive pump substantially, the invention provides a kind of load sensing hydraulic control system and method and engineering machinery.
On the one hand, the invention provides a kind of load sensing hydraulic control system, comprising:
Electric control pump;
Load-sensitive valve, its filler opening connects the oil outlet of described electric control pump;
First pressure transducer, is connected with described electric control pump oil outlet, for measuring the first force value of described electric control pump oil outlet, and generates the first pressure information;
Second pressure transducer, is connected with the load pressure feedback ports of described load-sensitive valve, for measuring the second force value of the load pressure feedback ports of described load-sensitive valve, and generates the second pressure information;
Controller, be connected with described electric control pump, described first pressure transducer and the second pressure sensor signal, for receiving described first pressure information and described second pressure information, and for regulating the input current of described electric control pump according to described first pressure information and described second pressure information, make the difference of described first force value and described second force value equal predetermined difference value.
Further, the input current of described electric control pump is regulated to comprise according to described first pressure information and described second pressure information:
When the difference of described first force value and described second force value is greater than predetermined difference value, described controller turns down the input current of described electric control pump.
Further, the input current of described electric control pump is regulated to comprise according to described first pressure information and described second pressure information:
When the difference of described first force value and described second force value is less than predetermined difference value, described controller heightens the input current of described electric control pump.
Further, described electric control pump is electric proportional control variable displacement pump.
Further, the oil outlet of described load-sensitive valve connects load.
Further, described controller is provided with the regulon regulating described predetermined difference value size.
On the other hand, the present invention also provides a kind of load-sensitive hydraulic control method, comprising:
Obtain the first force value of electric control pump oil outlet;
Obtain the second force value of the load pressure feedback ports of load-sensitive valve;
The difference of more described first force value and described second force value, by regulating the input current of described electric control pump, makes the difference of described first force value and described second force value equal predetermined difference value.
Further, described " difference of more described first force value and described second force value, by regulating the input current of described electric control pump, makes the difference of described first force value and described second force value equal predetermined difference value " comprising:
When the difference of described electric first force value and described second force value is greater than predetermined difference value, turn down the input current of described electric control pump.
Further, described " difference of more described first force value and described second force value, by regulating the input current of described electric control pump, makes the difference of described first force value and described second force value equal predetermined difference value " comprising:
When the difference of described first force value and described second force value is less than predetermined difference value, heighten the input current of described electric control pump.
Again on the one hand, the present invention also provides a kind of engineering machinery, is provided with the load sensing hydraulic control system described in above-mentioned any one.
Compared with prior art, beneficial effect of the present invention is:
Load sensing hydraulic control system provided by the invention comprises electric control pump, load-sensitive valve, the first pressure transducer, the second pressure transducer and controller, and wherein the filler opening of load-sensitive valve connects the oil outlet of electric control pump; First pressure transducer is connected with electric control pump oil outlet, for measuring the force value of electric control pump oil outlet, second pressure transducer is connected with the load pressure feedback ports of load-sensitive valve, for measuring the force value of the load pressure feedback ports for load-sensitive valve, controller regulates the input current of electric control pump according to the difference of the force value of the load pressure feedback ports of the force value and load-sensitive valve that compare electric control pump oil outlet, makes the difference of the force value of the force value of electric control pump oil outlet and the load pressure feedback ports of load-sensitive valve equal predetermined difference value.This control system can be applied in the hydraulic system not comprising load sensitive pump, includes electric control pump and load-sensitive valve in important hydraulic system, all can use this load sensing hydraulic control system, improves the generality that load sensing hydraulic control system uses.
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 the structural representation of load sensing hydraulic control system in the embodiment of the present invention;
Fig. 2 is the schematic flow sheet of load-sensitive hydraulic control method in the embodiment of the present invention.
Description of reference numerals:
1, electric control pump; 11, the first pressure transducer; 2, load-sensitive valve; 21, the second pressure transducer.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technological scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.Below in conjunction with accompanying drawing, each preferred embodiment of the present invention is described further:
For in prior art because load-sensitive hydraulic system can only be coordinated load-sensitive valve to use by load sensitive pump substantially, and this load-sensitive hydraulic system caused uses limited problem, the embodiment of the present invention provides a kind of load sensing hydraulic control system and method, load-sensitive hydraulic system can be applied in the hydraulic system of electric control pump, can improve the popularity of load-sensitive hydraulic system application.
device embodiment
Refer to Fig. 1, its load sensing hydraulic control system structural schematic block diagram proposed for the present embodiment, this load sensing hydraulic control system comprises electric control pump 1, load-sensitive valve 2 and load, wherein, the filler opening of electric control pump 1 connects fuel tank, and the oil outlet (P mouth) of electric control pump 1 connects the filler opening of load-sensitive valve 2, and the oil outlet of load-sensitive valve 2 connects load, load connects oil return circuit, oil return circuit connected tank.The controller that this load sensing hydraulic control system also comprises the first pressure transducer 11 be connected with electric control pump 1 oil outlet, the second pressure transducer 21 be connected with the load pressure feedback ports (LS mouth) of described load-sensitive valve 2 and is connected with electric control pump 1, first pressure transducer 11 and the second pressure transducer 21 signal.The automatically controlled end connection control device of electric control pump 1, the hydraulic oil displacement size that controller regulates it to export by the size of current of the automatically controlled end input controlling electric control pump 1.
Wherein, the first pressure transducer 11 for measuring the first force value of electric control pump 1 oil outlet, and generates the first pressure information; Second pressure transducer 21 for measuring the second force value of the load pressure feedback ports for load-sensitive valve 2, and generates the second pressure information; Controller receives the first pressure information and the second pressure information, and the input current of electric control pump 1 is regulated according to the first pressure information and the second pressure information, make the difference of the force value of the force value of electric control pump 1 oil outlet and the load pressure feedback ports of load-sensitive valve 2 equal predetermined difference value.
In above-described embodiment, controller regulates the input current optional manner of electric control pump 1 to be according to the first pressure information and the second pressure information: the first force value deduct the second force value be greater than predetermined difference value time, controller turns down the input current of electric control pump 1, the hydraulic oil discharge capacity that electric control pump 1 is exported reduces, and then makes the force value of electric control pump 1 oil outlet (the first force value) equal predetermined difference value with the difference of the force value (the second force value) of the load pressure feedback ports of load-sensitive valve 2.
In above-described embodiment, controller regulates the input current optional manner of electric control pump 1 to be according to the first pressure information and the second pressure information: the first force value deduct the second force value be less than predetermined difference value time, controller heightens the input current of electric control pump 1, make electric control pump 1 continue output hydraulic pressure oil discharge capacity to raise, and then make the force value of electric control pump 1 oil outlet (the first force value) equal predetermined difference value with the difference of the force value (the second force value) of the load pressure feedback ports of load-sensitive valve 2.
As the optional mode of execution of one, in above-described embodiment, electric control pump 1 is electric proportional control variable displacement pump, by inputting the electric current of different size at its automatically controlled end, and its hydraulic oil discharge capacity exported of proportion adjustment.
As the optional mode of execution of one, in above-described embodiment, controller is also provided with the regulon regulating described predetermined difference value size.Regulate predetermined difference value by regulon, this load sensing hydraulic control system is controlled more flexible, to adapt to the requirement of different hydraulic system responsive to load degree.
Below in conjunction with Fig. 1, the structural principle of above-described embodiment is once illustrated:
As shown in Figure 1, in this hydraulic system, the P mouth (oil outlet) of electric control pump 1 connects the filler opening of load-sensitive valve 2 by oil-feed oil circuit, and the oil outlet of load-sensitive valve 2 connects load, and load connects oil return circuit.
The automatically controlled end connection control device of electric control pump 1, controller is for controlling the input current size of electric control pump, and electric control pump 1 exports the hydraulic oil discharge capacity of different size when inputting the input current of different size; Load-sensitive valve 2 also has the load pressure feedback ports (LS mouth) of the guide's oil circuit in connecting fluid pressing system.At the P mouth of electric control pump 1, first pressure transducer 11 is installed, at the LS mouth of load-sensitive valve, the second pressure transducer 21 is installed, be respectively used to monitor first force value (P1) of P mouth of electric control pump 1, second force value (P2) of the LS mouth of load-sensitive valve, in this hydraulic system, the predetermined pressure difference of load-sensitive is △ P, then compare the size of P1-P2 and △ P, regulate the hydraulic oil discharge capacity (V) of electric control pump:
If P1-P2 < △ is P, then by improving the input current of electric control pump, improve the hydraulic oil discharge capacity (V) of electric control pump;
If P1-P2> △ is P, then by reducing the input current of electric control pump, reduce the hydraulic oil discharge capacity (V) of electric control pump;
If P1-P2=△ is P, then keep the input current of electric control pump, ensure that the hydraulic oil discharge capacity (V) of electric control pump is constant.
P mouth pressure value according to electric control pump 1 compares the hydraulic oil discharge capacity (V) changing electric control pump with the force value of the LS mouth of load-sensitive valve, only need increase by two pressure transducers and controller and namely achieve the load sensing hydraulic control system that electric control pump 1 mates with load-sensitive valve 2; This load sensing hydraulic control system is easy to operate, only the size changing predetermined difference value need be regulated can to change the predetermined pressure difference △ P of load-sensitive by the regulon in controller; Highly versatile, the load-sensitive hydraulic system that every electric control pump 1 is mated with load-sensitive valve 2 all realizes by this control system.
embodiment of the method
Correspondingly, the embodiment of the present invention also provides a kind of load-sensitive hydraulic control method, and as shown in Figure 2, this load-sensitive hydraulic control method comprises its flow chart:
Step one, obtains the first force value of electric control pump 1 oil outlet;
Step 2, obtains the second force value of the load pressure feedback ports of load-sensitive valve 2;
Step 3, compares the difference of the first force value and the second force value, by regulating the input current of electric control pump 1, makes the difference of the first force value and the second force value equal predetermined difference value.
As the optional mode of execution of one, in above-described embodiment, step 3 comprises:
When the difference that the first force value deducts the second force value is greater than predetermined difference value, turn down the input current of electric control pump 1.
As the optional mode of execution of one, in above-described embodiment, step 3 also comprises:
The first force value deduct the second force value be less than predetermined difference value time, heighten the input current of electric control pump.
Because above-mentioned load sensing hydraulic control system has above-mentioned technique effect, therefore, the load-sensitive hydraulic control method corresponding to this load sensing hydraulic control system also should possess corresponding technique effect, and its specific implementation process is similar to the above embodiments, does not hereby repeat.
The embodiment of the present invention also provides a kind of engineering machinery, and this driving is provided with the load sensing hydraulic control system described in above-mentioned any one.
Because above-mentioned load sensing hydraulic control system has above-mentioned technique effect, therefore, the engineering machinery with this load sensing hydraulic control system also should possess corresponding technique effect, and its specific implementation process is similar to the above embodiments, does not hereby repeat.
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 (10)
1. a load sensing hydraulic control system, is characterized in that, comprising:
Electric control pump (1);
Load-sensitive valve (2), its filler opening connects the oil outlet of described electric control pump (1);
First pressure transducer (11), is connected with described electric control pump (1) oil outlet, for measuring the first force value of described electric control pump (1) oil outlet, and generates the first pressure information;
Second pressure transducer (21), be connected with the load pressure feedback ports of described load-sensitive valve (2), for measuring the second force value of the load pressure feedback ports of described load-sensitive valve (2), and generate the second pressure information;
Controller, be connected with described electric control pump (1), described first pressure transducer (11) and the second pressure transducer (21) signal, for receiving described first pressure information and described second pressure information, and for regulating the input current of described electric control pump (1) according to described first pressure information and described second pressure information, make the difference of described first force value and described second force value equal predetermined difference value.
2. load sensing hydraulic control system according to claim 1, is characterized in that, regulates the input current of described electric control pump (1) to comprise according to described first pressure information and described second pressure information:
When the difference of described first force value and described second force value is greater than predetermined difference value, described controller turns down the input current of described electric control pump (1).
3. load sensing hydraulic control system according to claim 2, is characterized in that, regulates the input current of described electric control pump (1) to comprise according to described first pressure information and described second pressure information:
When the difference of described first force value and described second force value is less than predetermined difference value, described controller heightens the input current of described electric control pump (1).
4. load sensing hydraulic control system according to claim 1, is characterized in that, described electric control pump (1) is electric proportional control variable displacement pump.
5. load sensing hydraulic control system according to claim 1, is characterized in that, the oil outlet of described load-sensitive valve (2) connects load.
6. the load sensing hydraulic control system according to any one of claim 1-5, is characterized in that, described controller is provided with the regulon regulating described predetermined difference value size.
7. a load-sensitive hydraulic control method, is characterized in that, comprising:
Obtain the first force value of electric control pump (1) oil outlet;
Obtain the second force value of the load pressure feedback ports of load-sensitive valve (2);
The difference of more described first force value and described second force value, by regulating the input current of described electric control pump (1), makes the difference of described first force value and described second force value equal predetermined difference value.
8. load-sensitive hydraulic control method according to claim 7, it is characterized in that, described " difference of more described first force value and described second force value; by regulating the input current of described electric control pump (1) makes the difference of described first force value and described second force value equal predetermined difference value " comprising:
When the difference of described electric first force value and described second force value is greater than predetermined difference value, turn down the input current of described electric control pump (1).
9. the load-sensitive hydraulic control method according to claim 7 or 8, it is characterized in that, described " difference of more described first force value and described second force value; by regulating the input current of described electric control pump (1) makes the difference of described first force value and described second force value equal predetermined difference value " comprising:
When the difference of described first force value and described second force value is less than predetermined difference value, heighten the input current of described electric control pump.
10. an engineering machinery, is characterized in that, is provided with the load sensing hydraulic control system described in claim 1 to 6 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410538529.9A CN104314927A (en) | 2014-10-14 | 2014-10-14 | Load-sensitive hydraulic control system and method and engineering machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410538529.9A CN104314927A (en) | 2014-10-14 | 2014-10-14 | Load-sensitive hydraulic control system and method and engineering machine |
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| CN104314927A true CN104314927A (en) | 2015-01-28 |
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| CN201410538529.9A Pending CN104314927A (en) | 2014-10-14 | 2014-10-14 | Load-sensitive hydraulic control system and method and engineering machine |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109927039A (en) * | 2016-11-22 | 2019-06-25 | 北京航空航天大学 | A kind of robot hydraulic-driven cradle head closed-loop control system |
| CN110513346A (en) * | 2019-09-18 | 2019-11-29 | 济宁海推重工科技有限公司 | A kind of excavator hydraulic control system and method |
| CN110836202A (en) * | 2019-12-05 | 2020-02-25 | 浙江大学 | Hydraulic source load self-adaptive system and self-adaptive control method thereof |
| CN110905870A (en) * | 2019-12-09 | 2020-03-24 | 柳州柳工液压件有限公司 | Load sensitive hydraulic system |
| CN112443521A (en) * | 2020-12-07 | 2021-03-05 | 雷沃工程机械集团有限公司 | Load sensitive system and method for reducing pipeline influence |
| CN114215799A (en) * | 2022-02-21 | 2022-03-22 | 徐州徐工环境技术有限公司 | Load-sensitive constant-power hydraulic system for vertical pressure station |
| WO2023109049A1 (en) * | 2021-12-17 | 2023-06-22 | 中联重科建筑起重机械有限责任公司 | Intelligent hydraulic system and hydraulic jacking device |
| CN118564274A (en) * | 2024-07-31 | 2024-08-30 | 中煤北京煤矿机械有限责任公司 | Multistage feedback type hydraulic support servo control system |
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| WO2023109049A1 (en) * | 2021-12-17 | 2023-06-22 | 中联重科建筑起重机械有限责任公司 | Intelligent hydraulic system and hydraulic jacking device |
| CN114215799A (en) * | 2022-02-21 | 2022-03-22 | 徐州徐工环境技术有限公司 | Load-sensitive constant-power hydraulic system for vertical pressure station |
| CN118564274A (en) * | 2024-07-31 | 2024-08-30 | 中煤北京煤矿机械有限责任公司 | Multistage feedback type hydraulic support servo control system |
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Application publication date: 20150128 |
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