CN1015021B - Leakage Electric Compensation Volumetric Hydraulic Pump Constant Current Regulation System and Method - Google Patents
Leakage Electric Compensation Volumetric Hydraulic Pump Constant Current Regulation System and MethodInfo
- Publication number
- CN1015021B CN1015021B CN 88100117 CN88100117A CN1015021B CN 1015021 B CN1015021 B CN 1015021B CN 88100117 CN88100117 CN 88100117 CN 88100117 A CN88100117 A CN 88100117A CN 1015021 B CN1015021 B CN 1015021B
- Authority
- CN
- China
- Prior art keywords
- pump
- flow
- leakage
- displacement
- constant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Control Of Positive-Displacement Pumps (AREA)
Abstract
一种泄漏电补偿容积式液压泵恒流调节系统和方法，属于液压泵恒流量调节技术，本发明在电反馈排量泵的基础上，在油泵出口处设置油温、压力传感器或在泵的外泄漏管与补偿电路间串联流量传感器，经信号处理辨识出泵的泄漏流量，并对输入讯号进行实时电补偿，从而获得恒流泵特性。本发明可对各种容积式变量泵实现泵的恒流量调节，并完全避免了现有的恒流量调节泵因设置流量检测元件所造成的能量损失。
A leakage electric compensation displacement hydraulic pump constant flow regulation system and method, which belongs to the hydraulic pump constant flow regulation technology, the present invention is based on the electric feedback displacement pump, oil temperature and pressure sensors are set at the outlet of the oil pump or at the pump The flow sensor is connected in series between the external leakage pipe and the compensation circuit, and the leakage flow of the pump is identified through signal processing, and the input signal is electrically compensated in real time, so as to obtain the characteristics of the constant flow pump. The invention can realize the constant flow adjustment of various volumetric variable pumps, and completely avoids the energy loss caused by the arrangement of flow detection elements in the existing constant flow adjustment pumps.
Description
The invention belongs to Hydraulic Pump Constant Flow amount regulation technology.
Flow is a basic parameter in the fluid dynamic control.Whether the Flow-rate adjustment of volume-type hydraulic pump is subjected to the influence of other disturbing factors such as load according to the flow of logistics, divide into that permanent discharge capacity is regulated and constant current amount adjusting two big classes.With the adjusting oil cylinder displacement of displacement transducer impression reflection oil pump capacity, and feeding back to the electric feedback regulation closed loop that servovalve or Proportional valve constituted of controlled variable outlet, is a kind of permanent discharge capacity control, and it can not get rid of the influence of other disturbing factors such as load.It is that the flow that makes pump export to system is not subjected to the influence of other disturbing factors such as load and remains setting value that the constant current amount of volume-type hydraulic pump is regulated.The constant current amount is regulated pump and is called power again and adapts to pump, because of its output flow and pressure are that power all adapts with bearing power, can make system reach higher efficient and is widely used.Up to now, the constant current amount is regulated pump one flow sensor is set on working connection usually both at home and abroad, to realize the flow detection feedback control.Two kinds of forms are generally arranged, and a kind of is that a flow controller is set in the working connection of oil hydraulic pump, is pressure reduction with the output flow signal conversion, and realizes flow pressure reduction feedback, and pump delivery is compensated adjusting, reaches the output of constant current amount.Another kind is the output flow that a flow transducer testing pump is set in the working connection of oil hydraulic pump, and the flux signal that flow transducer detects gained is converted into displacement, power or voltage signal, again relatively, realize the flow feedback regulation and realize that the constant current amount of pump regulates itself and given signal.But, though regulating, pressure differential detection feedback-type constant current amount can obtain a less regulating error (＜10%) and comparatively satisfied regulation range, but the pressure loss at flow controller place is at least 1.0～1.4MPa as feedback signal, although and the constant current amount that adopts flow transducer is regulated flow transducer under corresponding conditions, its operating pressure differential is compared with above-mentioned flow controller as the flow-pressure differential transducer, only need 1/3～1/2, but still need 0.5～0.7MPa.No matter this shows, be the regulating method of which kind of constant flow pump, because of directly detect load flow on working connection, brought additional full flow throttling power loss.When working under rated pressure for the high-pressure service pump of 31.5MPa, about wasted power 2～4% is when working under rated pressure for the medium pressure pump of 16.0MPa, about wasted power 3～9%, when moving under the low pressure operating mode, operational efficiency is lower, and this is undoubtedly a kind of energy loss.
Regulate the drawback that there is the secondary power loss in pump in order to overcome above-mentioned existing constant current amount, develop a kind of employing and leak electronic compensating volume-type hydraulic pump constant flow regulation system and method, special proposition the present invention.
The invention reside in when avoiding the Hydraulic Pump Constant Flow amount to regulate fully, because of the energy loss that flow detecting element causes is set on working connection.Consider that it is the leakage flow that ambient conditions such as compensating load causes that the Hydraulic Pump Constant Flow amount is regulated, and leakage flow when working medium is selected, is the function of working pressure and oil temperature to given pump.Therefore, the constant flow pump characteristic can by measuring pressure fuel pump, oil temperature, be carried out real-time electronic compensating by known penality function to input signal and realize on the basis of electric feedback constant displacement pump.In addition, also can become to determine to concern this characteristics with the leakage quantity that leaks, by only detecting the external leakage flow, handle the leakage flow that picks out pump, and input signal is carried out real-Time Compensation, thereby obtain the constant current flow characteristic through the electric signal ratio according to the total leakage rate of oil pump.
Effect of the present invention is: it can realize the constant flow regulation of pump to various positive displacement variable displacement pumps, and has avoided existing constant current amount to regulate pump because of the energy loss that flow detecting element causes is set fully.
Description of drawings:
Fig. 1, leakage electronic compensating volume-type hydraulic pump constant flow regulation system diagram;
Fig. 2, leakage electronic compensating volume-type hydraulic pump constant flow regulation structural drawing.
Among the figure: 1-threeway servovalve, the 2-proportional amplifier, the 3-displacement transducer, 4-regulates oil cylinder, 5-pump body, 6-external leakage flow transducer, 7-compensating circuit, 8-oil temperature sensor, 9-pressure transducer.
The invention will be further described below in conjunction with accompanying drawing: as Fig. 1, shown in Figure 2, leakage electronic compensating volume-type hydraulic pump constant flow regulation of the present invention system, it comprises by threeway servovalve 1, proportional amplifier 2, the displacement transducer 3 of reflection oil pump capacity, regulate oil cylinder 4, on the basis of the electric feedback constant displacement pump that pump body 5 is formed, at the outlet port of pump body 5 amount of the establishing oil temperature sensor 8 of packing into, pressure transducer 9, oil temperature sensor 8, the other end of pressure transducer 9 is connected with compensating circuit 7 or the low differential pressure external leakage flow transducer 6 of connecting between leak fistulae and the compensating circuit 7 of pump body 5, and through compensating circuit with input signal u
iCarry out transformation of scale, carry out compensation, reach the constant flow pump characteristic.Oil temperature sensor 8 and pressure transducer 9 can be selected the corresponding product of selling on the market for use, and low differential pressure external leakage flow transducer 6 can adopt the little flow fax sense patterns such as turbine flowmeter of the pressure loss.
But for given pump and its leakage rate approximate expression of working medium:
∑q＝q
i+q
out K
p·
+K
T（T-T
50°）……（1）
∑q＝（l+K
oi）……（2）
In the formula: q
i-internal leakage flow
q
Out-external leakage flow
K
p-leak pressure constant can be obtained by actual measurement
K
T-leaking thermal constant, can obtain by actual measurement
K
Oi-internal and outernal leakage proportionality constant depends on the kind and the size of pump
T
50 °-50 ℃, the standard state temperature
The pressure flow compensation also can be adopted linear approximation, that is:
∑q
K
pP+K
T（T-T
50°）……（3）
In fact compensating circuit can adopt the compensation potentiometer to realize, and adjusts the operation point according to length working time of actual measurement or pump, very convenient linearity or the nonlinear compensation that realizes leakage rate relative pressure and oil temperature.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88100117 CN1015021B (en) | 1988-01-16 | 1988-01-16 | Leakage Electric Compensation Volumetric Hydraulic Pump Constant Current Regulation System and Method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88100117 CN1015021B (en) | 1988-01-16 | 1988-01-16 | Leakage Electric Compensation Volumetric Hydraulic Pump Constant Current Regulation System and Method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1034981A CN1034981A (en) | 1989-08-23 |
| CN1015021B true CN1015021B (en) | 1991-12-04 |
Family
ID=4831185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88100117 Expired CN1015021B (en) | 1988-01-16 | 1988-01-16 | Leakage Electric Compensation Volumetric Hydraulic Pump Constant Current Regulation System and Method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1015021B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922487A (en) * | 2010-06-18 | 2010-12-22 | 无锡市海航电液伺服系统有限公司 | Oil leak monitoring system of hydraulic servo pump station |
| WO2016142813A1 (en) * | 2015-03-10 | 2016-09-15 | Sonderhoff Engineering Gmbh | Method for compensating leakage losses and conveyor system for conveying a defined volume of a liquid |
| CN105386953B (en) * | 2015-12-25 | 2017-04-19 | 上海交通大学 | Digital flow-distribution constant-flow radial plunger pump |
| CN105804964B (en) * | 2016-03-15 | 2018-05-29 | 北京星达科技发展有限公司 | High pressure constant flow pump and flow closed loop control method |
| JP7246297B2 (en) * | 2019-12-16 | 2023-03-27 | 日立建機株式会社 | construction machinery |
| CN113606206B (en) * | 2021-05-26 | 2022-04-29 | 广州嘉泰液压机电有限公司 | Hydraulic test oil source system |
-
1988
- 1988-01-16 CN CN 88100117 patent/CN1015021B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1034981A (en) | 1989-08-23 |
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| C13 | Decision | ||
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |