CN102734277A - High-accuracy and high-efficiency intelligent closed loop servo pump control system - Google Patents
High-accuracy and high-efficiency intelligent closed loop servo pump control system Download PDFInfo
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- CN102734277A CN102734277A CN201210240988XA CN201210240988A CN102734277A CN 102734277 A CN102734277 A CN 102734277A CN 201210240988X A CN201210240988X A CN 201210240988XA CN 201210240988 A CN201210240988 A CN 201210240988A CN 102734277 A CN102734277 A CN 102734277A
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Abstract
The invention provides a high-accuracy and high-efficiency intelligent closed loop servo pump control system, belonging to the technical field of injection molding machines and solving the problem of excessive energy consumption of a traditional servo pump control system. The high-accuracy and high-efficiency intelligent closed loop servo pump control system comprises a hydraulic oil cylinder, a reversing valve, an oil tank, a fixed displacement pump, a pressure sensor, a servo motor, a driver, a control module and a speed sensor, wherein the speed sensor is used for detecting the rotational speed of the hydraulic oil cylinder and outputting a detected rotational speed signal to the control module, the pressure sensor is used for detecting oil pressure and outputting a detected oil pressure signal to the control module, the control module carries out proportion operation, integral operation and differential operation so as to output a control signal to a drive module, and the drive module is used for changing the rotational speed of the servo motor according to the control signal. According to the high-accuracy and high-efficiency intelligent closed loop servo pump control system disclosed by the invention, by arranging two layers of PID (Proportion Integration Differentiation) operation control and accurately setting each PID value of the PID operation, linear output accuracy of pressure flow is controlled within 1 percent, and energy is saved by 30-60 percent compared with a variable pump system with the same power.
Description
Technical field
The present invention relates to the injection machine technical field, relate in particular to a kind of high-accuracy high-efficiency rate intelligence closed loop servo pump control system.
Background technique
The manufacturing process of injection machine generally is divided into several stages such as matched moulds, locked mode, injection, melten gel, pressurize cooling, rapping and delivery.Needed pressure of each stage and oily flow are variant; For oil pump motor, its load always is in state of changing in the whole injection moulding process, in the hydraulic system of existing quantitative pump; Oil pump motor provides constant flow with constant rotating speed; Unnecessary hydraulic oil refluxes through relief valve, and in this process, the energy of oil pump motor loss is up to 36%-68%.
Inclined disc type variable pump systems of the prior art has solved the problems referred to above; The flow of oil pump motor can change along with the adjusting of swash plate angle; The output power that is to say variable displacement pump changes along with the variation of load, produces the requirement of producing yet its precision can not satisfy existing highi degree of accuracy.
Simultaneously, because line voltage, frequency and unstable, thereby, also can reduce the injecting products yield rate when because line voltage or change of frequency make motor rotary speed change when causing changes in flow rate.
Summary of the invention
Technical problem to be solved by this invention is, to the above-mentioned deficiency of existing technology, proposes that a kind of control accuracy is higher, the high-accuracy high-efficiency rate of energy saving intelligence closed loop servo pump control system.
The technological scheme that the present invention solves its technical problem employing is to propose a kind of high-accuracy high-efficiency rate intelligence closed loop servo pump control system, and it comprises hydraulic jack, selector valve, fuel tank, metering pump, pressure transducer, actuating motor, driver, control module and velocity transducer; Said actuating motor drives metering pump to hydraulic jack hydraulic oil to be provided, and hydraulic oil is through getting into hydraulic jack and being back to fuel tank through selector valve once more behind the selector valve; Velocity transducer is electrically connected hydraulic jack and control module detects tach signal to control module in order to rotating speed and the output that detects hydraulic jack; Pressure transducer is connected in the electrical connection metering pump and selector valve detects fuel injection pressure signal to control module in order to detect oil pressure and output; Tach signal carries out ratio, integration with the deviation of setting tachometer value and detection fuel injection pressure signal with the deviation of setting oil pressure value, differentiating outputs control signals to driver module thereby said control module is through detecting; Said driver module changes the actuating motor rotating speed according to said control signal.
Further, the ratio setting value of said control module is 25 to 31, and the integration setting value is 12.5 to 14.7, and the differential setting value is 0 to 0.7.
Further, said pressure transducer also exports its detected detected pressures value to driver, and said driver utilizes the PID computing module of establishing in it to carry out PID control according to the detected pressures value of pressure transducer.
Further, the PID setting value of said PID computing module is respectively: P:12-21, I:2.4-5.7, D:0.
The present invention is through being provided with two-layer PID s operation control; And each item pid value of PID computing is set accurately; Make the high-accuracy high-efficiency rate intelligence closed loop servo pump control system linear output of its pressure flow repeatability of the present invention be controlled in 1%, also can carry out the Ultra-Low Speed injection of 1mm/S than the energy-conservation 30%-60% of the variable pump systems of equal-wattage.
Description of drawings
Fig. 1 is the circuit theory schematic representation of high-accuracy high-efficiency rate intelligence closed loop servo pump control system of the present invention.
Embodiment
Below be specific embodiment of the present invention and combine accompanying drawing, technological scheme of the present invention is done further to describe, but the present invention is not limited to these embodiments.
Please with reference to Fig. 1, Fig. 1 is the circuit theory schematic representation of high-accuracy high-efficiency rate intelligence closed loop servo pump control system of the present invention.Among Fig. 1, high-accuracy high-efficiency rate intelligence closed loop servo pump control system of the present invention comprises hydraulic jack 1, selector valve 2, fuel tank 3, filter 4, metering pump 5, pressure transducer 6, actuating motor 7, driver 8, control module 9 and velocity transducer 10.
Said actuating motor 7 drives metering pump 5 and to give hydraulic jack 1 hydraulic oil is provided, and when selector valve 2 started, hydraulic oil got into the A chamber through the P chamber and is delivered to hydraulic jack 1 back and is back to the T chamber by the B chamber, and finally is back to fuel tank 3 by the T chamber.Pressure transducer 6 is electrically connected between metering pumps 5 and the selector valve 2 in order to the detection oil pressure, and will detect fuel injection pressure signal and export control module 9 to.
Velocity transducer 10 is electrically connected between hydraulic jacks 1 and the control module 9 that also will detect tach signal exports control module 9 in order to the rotating speed that detects hydraulic jack 1.
Control module 9 outputs control signals to driver 8 according to the detection tach signal that receives with detecting fuel injection pressure signal, is changed the rotating speed of actuating motor 7 by driver 8.
Among the present invention, control module 9 adopts PID s operation control mode, thereby tach signal carries out ratio, integration with the deviation of setting tachometer value and detection fuel injection pressure signal with the deviation of setting oil pressure value, differentiating outputs control signals to driver module 8 through detecting.In the present embodiment, control module 9 is PLC (programmable logic controller (PLC)).
Scale operation is meant the proportionate relationship of output controlled quentity controlled variable and deviation.Scale parameter is set big more, and the sensitivity of control is low more, and setting value is more little, and the sensitivity of control is high more.The purpose of integral operation is to eliminate deviation, as long as deviation exists, integral action moves controlled quentity controlled variable to the direction that deviation is eliminated.Be the unit of expression integral action intensity intergration time.The intergration time of setting is short more, and integral action is strong more.Scale operation and integral operation are to control result's corrective action, respond slower.Differentiate is to replenish for the shortcoming of eliminating scale operation and integral operation.The differential action is revised output quantity according to the speed that deviation produces, and makes control procedure return to original state of a control as early as possible, and be the unit of the expression differential action intensity derivative time, and derivative time is long more, and is then strong more with the correction of the differential action.For reaching highi degree of accuracy, high efficiency control, the PID setting value of PID computing is respectively in the control module 9 of the present invention: P:25-31, I:12.5-14.7, D:0-0.7.
Except the above-mentioned closed loop control system that constitutes by hydraulic jack 1, velocity transducer 10, control module 9, driver 8, actuating motor 7, pressure transducer 6 and metering pump 5; In the present invention's one preferred embodiment; Pressure transducer 6 also exports its detected detected pressures value to driver 8, therefore also comprises the half-closed loop control system that is made up of pressure transducer 6, driver 8 and actuating motor 7.This half-closed loop control system control actuating motor ultra low speed operation is to guarantee the injection moulding precision.Driver 8 can carry out PID control through the PID computing module of establishing in it according to the detected pressures value of pressure transducer 6.In this preferred embodiment, the PID setting value of the PID computing module of establishing in the pressure transducer 6 is respectively: P:12-21, I:2.4-5.7, D:0.
Be provided with the injection machine of high-accuracy high-efficiency rate intelligence closed loop servo pump control system of the present invention, the linear output of its pressure flow repeatability is controlled in 1%, also can carry out the Ultra-Low Speed injection of 1mm/S than the energy-conservation 30%-60% of the variable pump systems of equal-wattage.Simultaneously because accurate pid parameter design in the control module 9, the flow of hydraulic jack 1 is changed to response time of 100% by 0 and can be controlled in the 100ms, and the pressure of hydraulic jack 1 is changed to response time of 100% by 0 and can be controlled in the 50ms.
Specific embodiment described herein only is that the present invention's spirit is illustrated.Person of ordinary skill in the field of the present invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (4)
1. a high-accuracy high-efficiency rate intelligence closed loop servo pump control system is characterized in that: comprise hydraulic jack, selector valve, fuel tank, metering pump, pressure transducer, actuating motor, driver, control module and velocity transducer; Said actuating motor drives metering pump to hydraulic jack hydraulic oil to be provided, and hydraulic oil is through getting into hydraulic jack and being back to fuel tank through selector valve once more behind the selector valve; Velocity transducer is electrically connected hydraulic jack and control module detects tach signal to control module in order to rotating speed and the output that detects hydraulic jack; Pressure transducer is connected in the electrical connection metering pump and selector valve detects fuel injection pressure signal to control module in order to detect oil pressure and output; Tach signal carries out ratio, integration with the deviation of setting tachometer value and detection fuel injection pressure signal with the deviation of setting oil pressure value, differentiating outputs control signals to driver module thereby said control module is through detecting; Said driver module changes the actuating motor rotating speed according to said control signal.
2. a kind of high-accuracy high-efficiency rate intelligence closed loop servo pump control system as claimed in claim 1, it is characterized in that: the ratio setting value of said control module is 25 to 31, and the integration setting value is 12.5 to 14.7, and the differential setting value is 0 to 0.7.
3. according to claim 1 or claim 2 a kind of high-accuracy high-efficiency rate intelligence closed loop servo pump control system; It is characterized in that: said pressure transducer also exports its detected detected pressures value to driver, and said driver utilizes the PID computing module of establishing in it to carry out PID control according to the detected pressures value of pressure transducer.
4. a kind of high-accuracy high-efficiency rate intelligence closed loop servo pump control system as claimed in claim 3, it is characterized in that: the PID setting value of said PID computing module is respectively: P:12-21, I:2.4-5.7, D:0.
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| CN201210240988.XA CN102734277B (en) | 2012-07-04 | 2012-07-04 | High-accuracy and high-efficiency intelligent closed loop servo pump control system |
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| CN201210240988.XA CN102734277B (en) | 2012-07-04 | 2012-07-04 | High-accuracy and high-efficiency intelligent closed loop servo pump control system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104154053A (en) * | 2014-07-18 | 2014-11-19 | 国家电网公司 | Main-cylinder hydraulic loop system |
| CN104235123A (en) * | 2013-12-18 | 2014-12-24 | 柳州欧维姆机械股份有限公司 | Hydraulic actuator and method for realizing positioning control and position feedback thereof |
| WO2014206342A1 (en) * | 2013-06-28 | 2014-12-31 | Eaton Corporation | Servo pump control system and method |
| CN109826771A (en) * | 2017-11-23 | 2019-05-31 | 上海舜诺机械有限公司 | A kind of high-precision electric hydraulic pump |
| CN111043004A (en) * | 2019-12-31 | 2020-04-21 | 天津理工大学 | Intelligent pump power matching system of mechanical arm |
| CN111501869A (en) * | 2020-05-20 | 2020-08-07 | 三一重机有限公司 | Electric control hydraulic servo control system and method and electric excavator |
| CN111810495A (en) * | 2020-07-30 | 2020-10-23 | 宁波埃科思注塑科技有限公司 | Injection molding machine mode locking hydraulic system of closed oil circuit |
| CN111852996A (en) * | 2020-07-30 | 2020-10-30 | 宁波埃科思注塑科技有限公司 | Drive control system of closed oil circuit |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2014206342A1 (en) * | 2013-06-28 | 2014-12-31 | Eaton Corporation | Servo pump control system and method |
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| CN111043004A (en) * | 2019-12-31 | 2020-04-21 | 天津理工大学 | Intelligent pump power matching system of mechanical arm |
| CN111501869A (en) * | 2020-05-20 | 2020-08-07 | 三一重机有限公司 | Electric control hydraulic servo control system and method and electric excavator |
| CN111810495A (en) * | 2020-07-30 | 2020-10-23 | 宁波埃科思注塑科技有限公司 | Injection molding machine mode locking hydraulic system of closed oil circuit |
| CN111852996A (en) * | 2020-07-30 | 2020-10-30 | 宁波埃科思注塑科技有限公司 | Drive control system of closed oil circuit |
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