CN101660519A - Electrical feedback electro-hydraulic proportional pressure flux compound control method and variable output pump - Google Patents
Electrical feedback electro-hydraulic proportional pressure flux compound control method and variable output pump Download PDFInfo
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- CN101660519A CN101660519A CN200910153106A CN200910153106A CN101660519A CN 101660519 A CN101660519 A CN 101660519A CN 200910153106 A CN200910153106 A CN 200910153106A CN 200910153106 A CN200910153106 A CN 200910153106A CN 101660519 A CN101660519 A CN 101660519A
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Abstract
The invention discloses an electrical feedback electro-hydraulic proportional pressure flux compound control method and a variable output pump. An outlet of a variable plunger pump is connected with an opening A of an electro-hydraulic proportional throttle valve; an inspection end of a differential pressure transducer is connected with the opening A and an opening B of the electro-hydraulic proportional throttle valve; a signal output end is connected with a controller; the inspection end of a pressure sensor is connected with the opening B of the electro-hydraulic proportional throttle valve; the output end is connected with the controller; a displacement sensor of a variable plunger and an output signal end are connected with the controller; an opening P of a two-position three-way electro-hydraulic proportional directional valve is connected with the outlet of the variable plunger pump; an opening T is communicated with an oil tank; the opening A is connected with a high pressure cavity of the variable plunger; and the output of the controller is respectively connected with the proportional electromagnet of the two-direction three-way electro-hydraulic proportional directionalvalve and the proportional electromagnet of the electro-hydraulic proportional throttle valve. The sensor is used for detecting the load pressure, the differential pressure at the two ends of the electro-hydraulic proportional throttle valve and the displacement signal of the variable plunger; and the controller is used for processing feedback signals and implementing closed loop control on systems to realize electro-hydraulic proportional pressure flux compound control.
Description
Technical field
The present invention relates to the compound controlled variable pump of a kind of electricity feedback electric-hydraulic proportion pressure flow.
Background technique
The compound controlled variable pump of traditional electric-hydraulic proportion pressure flow adopts the machine feedback control mode.Modulating valve is the pilot-operated type three-way valve, the electro-hydraulic proportional throttle valve pressure at two ends is communicated with the two ends of modulating valve respectively.The A mouth of modulating valve is communicated with the hyperbaric chamber of variable piston, when electro-hydraulic proportional throttle valve two ends pressure reduction was interfered, regulation valve core produced corresponding displacement, made the pressure in variable piston chamber change, make pump delivery change, and then it is constant to keep electro-hydraulic proportional throttle valve two ends pressure reduction.The pre compressed magnitude of modulating valve spring has determined the pressure reduction at electro-hydraulic proportional throttle valve two ends, so change the output flow that the opening of electro-hydraulic proportional throttle valve just can change variable displacement pump.Constant voltage control adopts electricity liquid ratio relief valve to realize, has pressure reduction on the damping hole when producing overflow, and this pressure reduction moves regulation valve core, and pump delivery is reduced.Though this traditional mechanical type feedback can realize the compound control of electric-hydraulic proportion pressure flow, but because the restriction of mechanical structure, the regulation range of pressure flow feedback control parameters is narrow, coupling between the parameter is strong, cause the indexs such as steady state controling precision, step response speed and stability margin of variable displacement pump output flow and pressure lower, the stability of system is not high, responds slower, occur vibration easily, can not normally use when situation is serious.
Summary of the invention
The purpose of this invention is to provide a kind of electrical feedback electro-hydraulic proportional pressure flux compound control method and variable displacement pump.
The technical solution used in the present invention is:
One, a kind of electrical feedback electro-hydraulic proportional pressure flux compound control method:
Adopt differential pressure pickup to detect the A of pump discharge electro-hydraulic proportional throttle valve, the pressure reduction of B mouth, pressure reduction is converted into proportional with it electrical signal, this electrical signal is sent to the feedback signal of controller as constant-pressure drop control; Utilize pressure transducer to detect the B mouth pressure of electro-hydraulic proportional throttle valve, pressure is converted into proportional with it electrical signal, this electrical signal is sent to the feedback signal of controller as ratio pressure control.The stroking mechanism of variable displacement pump is made of variable piston, bias spring and swash plate, and a displacement transducer is installed on variable piston, and the displacement of variable piston is converted into proportional with it electrical signal, sends controller to and is used for the discharge capacity closed loop control.Controller output two path control signal, wherein one tunnel control two-position three way electrohydraulic proportional directional valve opening amount is come the pressure of controlled variable plunger cavity, and then changes the variable pump delivery.The aperture of the electro-hydraulic proportional throttle valve of another road controlled variable pump discharge, the flow control of realization ratio combines with constant-pressure drop control function.
Two, a kind of variable displacement pump of electrical feedback electro-hydraulic proportional pressure flux compound control method:
The variable piston delivery side of pump links to each other with the A mouth of electro-hydraulic proportional throttle valve, the test end of differential pressure pickup respectively with the A of electro-hydraulic proportional throttle valve, the B mouth links to each other, the signal output part of differential pressure pickup links to each other with controller, the test end of pressure transducer links to each other with the B mouth of electro-hydraulic proportional throttle valve, the signal output part of pressure transducer links to each other with controller, displacement transducer is housed on the variable piston, the output signal end of displacement transducer links to each other with controller, the P mouth of two-position three way electrohydraulic proportional directional valve links to each other with the variable piston delivery side of pump, the T mouth leads to fuel tank, the A mouth links to each other with the variable piston hyperbaric chamber, the output control signal line of controller respectively with the proportion electro-magnet of two-position three way electrohydraulic proportional directional valve, the proportion electro-magnet of electro-hydraulic proportional throttle valve links to each other.
Described controller: the proportion electro-magnet that final stage carries out receiving after difference is amplified electro-hydraulic proportional throttle valve is imported, exported to the flux signal of its setting through first difference; The pressure signal of setting compares through the output signal of second difference input back with pressure transducer, and the signal difference that obtains is connected to the minimum value generator through the PID pressure controller; The pressure difference signal and the pressure differential resetting value of differential pressure pickup output simultaneously compare, and the signal difference that obtains is connected to the minimum value generator through the PID differential pressure controller; The minimum value generator is made up of comparator and analog switch, signal less in the input signal is passed through, compare from the signal of minimum value generator output and the output signal of LVDT displacement transducer, be connected to the proportion electro-magnet of electric-hydraulic proportion two-position three way directional control valve after the signal difference that obtains amplifies through PD discharge capacity controller, output final stage.
The beneficial effect that the present invention has is:
Utilize sensor to go out the pressure reduction at induced pressure, electro-hydraulic proportional throttle valve two ends, the displacement signal of variable piston, utilize controller to handle feedback signal, and system is carried out closed loop control realize the compound control of electric-hydraulic proportion pressure flow.This electric feedback is application controls algorithm, optimization control parameter flexibly, reach excellent control effect, speed of response increases, system is more stable, the parameter of revising system simultaneously is also very convenient, has overcome narrow, the strong shortcoming of coupling of the compound controlled variable pump of traditional mechanical reaction type pressure flow Control Parameter regulation range.
Description of drawings
Fig. 1 is the compound controlled variable pump structure of an electricity feedback electric-hydraulic proportion pressure flow principle schematic.
Fig. 2 is the controller circuitry principle schematic.
Fig. 3 is a pid control module circuit theory schematic representation in the controller.
Fig. 4 is a PD control module circuit theory schematic representation in the controller.
Fig. 5 is a difference load module circuit theory schematic representation in the controller.
Fig. 6 is a power module circuitry principle schematic in the controller.
Fig. 7 is an output final stage modular circuit principle schematic in the controller.
Fig. 8 is a minimum value generator module circuit diagram in the controller.
Among the figure: 1, the axial variable plunger pump body, 2, variable piston, 3, displacement transducer, 4, the two-position three way electrohydraulic proportional directional valve, 5, differential pressure pickup, 6, pressure transducer, 7, controller, 8, electro-hydraulic proportional throttle valve, 9, power supply, 10, the minimum value generator, 11, the discharge capacity controller, 12, the output final circuit, 13, the proportion electro-magnet of two-position three way electrohydraulic proportional directional valve, 14, differential pressure controller, 15, the pressure differential resetting circuit, 16, pressure controller, 17, the difference input circlult, 18, the difference input circlult, 19, the output final circuit, 20, the proportion electro-magnet of electro-hydraulic proportional throttle valve.
Embodiment
As shown in Figure 1, the compound controlled variable pump of electricity feedback electric-hydraulic proportion pressure flow main body is a Variable plunger pump 1, the outlet of plunger pump 1 links to each other with the A mouth of electro-hydraulic proportional throttle valve 8, differential pressure pickup 5 adopts the strain type differential pressure pickup, the Pressure testing end of differential pressure pickup 5 respectively with the A of electro-hydraulic proportional throttle valve 8, the B mouth links to each other, the signal output part of differential pressure pickup 5 links to each other with the pressure difference signal inlet opening of controller 7, pressure transducer 6 adopts strain pressure transducer, the Pressure testing end of pressure transducer 6 links to each other with the B mouth of electro-hydraulic proportional throttle valve 8, the signal output part of pressure transducer 6 links to each other with the pressure signal inlet opening of controller 7, LVDT formula displacement transducer 3 is housed on the variable piston 2, the signal output part of displacement transducer 3 links to each other with the displacement signal inlet opening of controller 7, the P mouth of two-position three way electrohydraulic proportional directional valve 4 links to each other with the outlet of Variable plunger pump 1, the T mouth leads to fuel tank, the A mouth links to each other with the hyperbaric chamber of variable piston 2, the control signal line of controller 7 respectively with the proportion electro-magnet of two-position three way electrohydraulic proportional directional valve 4, the proportion electro-magnet of electro-hydraulic proportional throttle valve 8 links to each other.More than used sensor be outsourcing piece.
The control principle block diagram of controller 7, as shown in Figure 2.The flux signal of setting carries out the proportion electro-magnet 20 of difference amplification with rear driving electro-hydraulic proportional throttle valve 8 through difference input circlult 18, output final circuit 19.The pressure signal of setting compares with the output signal of pressure transducer 6 after through difference input circlult 17, and the signal difference that obtains is input to later minimum value generator 10 again through PID pressure controller 16; The pressure difference signal and the pressure differential resetting value 15 of differential pressure pickup 5 outputs simultaneously compare, and the signal difference that obtains is input to later minimum value generator 10 again through PID differential pressure controller 14.Compare from the signal of minimum value generator 10 outputs and the output signal of LVDT displacement transducer 3, the signal difference that obtains amplifies the proportion electro-magnet 13 with rear driving electric-hydraulic proportion two-position three way directional control valve 4 through PD discharge capacity controller 11, output final stage 12 circuit.
The PID controller circuitry, as shown in Figure 3.
The PD controller circuitry, as shown in Figure 4.
The difference input circlult, as shown in Figure 5.
Power module circuitry as shown in Figure 6, can provide ± 15V voltage.
The output final circuit, as shown in Figure 7, the main realization carried out power amplification to control signal, drives proportion electro-magnet then.
The minimum value generator circuit is made of voltage comparator and analog switch, as shown in Figure 8, and by two input signals being compared less then signal.
The control principle of the compound controlled variable pump of electricity feedback electric-hydraulic proportion pressure flow is as follows:
The electric-hydraulic proportion flow control:
The electric-hydraulic proportion pressure control:
In order to improve the speed of response of system, LVDT formula displacement transducer 3 is housed on the variable piston 2.In the system dynamics adjustment process, the displacement signal of variable piston is fed back in the controller 7, carry out the closed loop control of variable discharge capacity, can significantly improve the speed of response of variable pump systems to pressure flow control.
Claims (3)
1. an electricity feeds back the compound controlled variable method for controlling pump of electric-hydraulic proportion pressure flow, it is characterized in that: adopt differential pressure pickup to detect the A of pump discharge electro-hydraulic proportional throttle valve, the pressure reduction of B mouth, pressure reduction is converted into proportional with it electrical signal, this electrical signal is sent to the feedback signal of controller as constant-pressure drop control; Utilize pressure transducer to detect the B mouth pressure of electro-hydraulic proportional throttle valve, pressure is converted into proportional with it electrical signal, this electrical signal is sent to the feedback signal of controller as ratio pressure control, the stroking mechanism of variable displacement pump is by variable piston, bias spring and swash plate constitute, a displacement transducer is installed on variable piston, the displacement of variable piston is converted into proportional with it electrical signal, send controller to and be used for the discharge capacity closed loop control, controller output two path control signal, wherein one tunnel control two-position three way electrohydraulic proportional directional valve opening amount is come the pressure of controlled variable plunger cavity, and then change variable pump delivery, the aperture of the electro-hydraulic proportional throttle valve of another road controlled variable pump discharge, the flow control of realization ratio combines with constant-pressure drop control function.
2. variable displacement pump of implementing the described electrical feedback electro-hydraulic proportional pressure flux compound control method of claim 1, it is characterized in that: the outlet of Variable plunger pump (1) links to each other with the A mouth of electro-hydraulic proportional throttle valve (8), the test end of differential pressure pickup (5) respectively with the A of electro-hydraulic proportional throttle valve (8), the B mouth links to each other, the signal output part of differential pressure pickup (5) links to each other with controller (7), the test end of pressure transducer (6) links to each other with the B mouth of electro-hydraulic proportional throttle valve (8), the signal output part of pressure transducer (6) links to each other with controller (7), displacement transducer (3) is housed on the variable piston (2), the output signal end of displacement transducer (3) links to each other with controller (7), the P mouth of two-position three way electrohydraulic proportional directional valve (4) links to each other with the outlet of Variable plunger pump (1), the T mouth leads to fuel tank, the A mouth links to each other with variable piston (2) hyperbaric chamber, the output control signal line of controller (7) respectively with the proportion electro-magnet of two-position three way electrohydraulic proportional directional valve (4), the proportion electro-magnet of electro-hydraulic proportional throttle valve (8) links to each other.
3, a kind of variable displacement pump of implementing claim 1 electrical feedback electro-hydraulic proportional pressure flux compound control method according to claim 2 is characterized in that described controller (7): the flux signal of its setting is imported (18), is exported the proportion electro-magnet (20) that final stage (19) carries out receiving after difference is amplified electro-hydraulic proportional throttle valve (8) through first difference; The output signal that the pressure signal of setting is imported (17) back and pressure transducer (6) through second difference compares, and the signal difference that obtains is connected to minimum value generator (10) through PID pressure controller (16); The pressure difference signal and the pressure differential resetting value (15) of differential pressure pickup (5) output simultaneously compare, and the signal difference that obtains is connected to minimum value generator (10) through PID differential pressure controller (14); Minimum value generator (10) is made up of comparator and analog switch, signal less in the input signal is passed through, compare from the signal of minimum value generator (10) output and the output signal of LVDT displacement transducer (3), be connected to the proportion electro-magnet (13) of electric-hydraulic proportion two-position three way directional control valve (4) after the signal difference that obtains amplifies through PD discharge capacity controller (11), output final stage (12).
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| CN2009101531064A CN101660519B (en) | 2009-09-14 | 2009-09-14 | Electrical feedback electro-hydraulic proportional pressure flux compound control method and variable output pump |
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| CN2009101531064A CN101660519B (en) | 2009-09-14 | 2009-09-14 | Electrical feedback electro-hydraulic proportional pressure flux compound control method and variable output pump |
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| CN101660519B CN101660519B (en) | 2011-05-18 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103089600A (en) * | 2012-11-28 | 2013-05-08 | 龙工（上海）桥箱有限公司 | Debugging device for variable displacement piston pump flow control valve |
| CN103147969A (en) * | 2013-03-22 | 2013-06-12 | 南京工业大学 | Micro-flow rate super-pressure reciprocating self-control pump |
| CN103557153A (en) * | 2013-11-20 | 2014-02-05 | 沈阳工业大学 | Electric-hydraulic proportional displacement regulating mechanism of axial plunger hydraulic pump |
| CN109538456A (en) * | 2018-09-18 | 2019-03-29 | 浙江大学 | It is a kind of jointly controlled using proportioning valve, miniature high-speed digital valve Electro-hydraulic Proportional Control pump and control method |
| CN109869363A (en) * | 2019-03-28 | 2019-06-11 | 上海豪高机电科技有限公司 | A kind of hydraulic intelligent control valve |
| CN110836202A (en) * | 2019-12-05 | 2020-02-25 | 浙江大学 | Hydraulic source load self-adaptive system and self-adaptive control method thereof |
| CN113482874A (en) * | 2021-08-09 | 2021-10-08 | 上海理工大学 | Variable swash plate type axial plunger pump with displacement feedback control |
| CN113513507A (en) * | 2021-06-25 | 2021-10-19 | 中航力源液压股份有限公司 | Control device for reducing starting torque of electric pump |
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2009
- 2009-09-14 CN CN2009101531064A patent/CN101660519B/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103089600A (en) * | 2012-11-28 | 2013-05-08 | 龙工（上海）桥箱有限公司 | Debugging device for variable displacement piston pump flow control valve |
| CN103147969A (en) * | 2013-03-22 | 2013-06-12 | 南京工业大学 | Micro-flow rate super-pressure reciprocating self-control pump |
| CN103147969B (en) * | 2013-03-22 | 2016-01-13 | 南京工业大学 | The reciprocal Self-controlled pump of micrometeor ultrahigh pressure |
| CN103557153A (en) * | 2013-11-20 | 2014-02-05 | 沈阳工业大学 | Electric-hydraulic proportional displacement regulating mechanism of axial plunger hydraulic pump |
| CN103557153B (en) * | 2013-11-20 | 2016-01-20 | 沈阳工业大学 | The electric-hydraulic proportion discharge capacity controlling mechanism of axial plunger hydraulic pump |
| CN109538456A (en) * | 2018-09-18 | 2019-03-29 | 浙江大学 | It is a kind of jointly controlled using proportioning valve, miniature high-speed digital valve Electro-hydraulic Proportional Control pump and control method |
| CN109538456B (en) * | 2018-09-18 | 2023-10-24 | 浙江大学 | Electro-hydraulic proportional valve control pump adopting proportional valve and miniature high-speed digital valve for combined control and control method |
| CN109869363A (en) * | 2019-03-28 | 2019-06-11 | 上海豪高机电科技有限公司 | A kind of hydraulic intelligent control valve |
| CN110836202A (en) * | 2019-12-05 | 2020-02-25 | 浙江大学 | Hydraulic source load self-adaptive system and self-adaptive control method thereof |
| CN113513507A (en) * | 2021-06-25 | 2021-10-19 | 中航力源液压股份有限公司 | Control device for reducing starting torque of electric pump |
| CN113513507B (en) * | 2021-06-25 | 2023-01-03 | 中航力源液压股份有限公司 | Control device for reducing starting torque of electric pump |
| CN113482874A (en) * | 2021-08-09 | 2021-10-08 | 上海理工大学 | Variable swash plate type axial plunger pump with displacement feedback control |
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| CN101660519B (en) | 2011-05-18 |
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Granted publication date: 20110518 Termination date: 20130914 |