CN105676690A - PWM-based intelligent solenoid valve control system and method thereof - Google Patents
PWM-based intelligent solenoid valve control system and method thereof Download PDFInfo
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- CN105676690A CN105676690A CN201610016459.XA CN201610016459A CN105676690A CN 105676690 A CN105676690 A CN 105676690A CN 201610016459 A CN201610016459 A CN 201610016459A CN 105676690 A CN105676690 A CN 105676690A
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
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Abstract
The invention discloses a PWM-based intelligent solenoid valve control system and a method thereof. The system comprises a control signal generator, a duty ratio controller, a voltage source, a current detector, a fuel tank, a solenoid valve, pressure sensors, an operator, and a signal comparator. The pressure sensors at a fuel inlet and a work port of the solenoid valve can detect the oil pressure all the time and feed the oil pressure back to the operator. The operator automatically calculates a starting current and a closing current on the basis of early stage test data of the solenoid valve. With the cooperation between the pressure sensors and the operator, even if the work state of the solenoid valve changes during work process, the system can make intelligent adjustments according to a pressure value read by the pressure sensors, so that the solenoid valve is adaptive to the work state. The control method adopts a single voltage source to regulate the duty ratio and thus does not need switch between multiple power sources, so that short circuit induced by power source switching does not happen, and working is more stable.
Description
Technical field
The present invention relates to a kind of electromagnetic valve intelligence control system based on voltage PWM and method thereof.
Background technology
In the research of electromagnetic valve, number of ampere turns and working gas gap are maximum to the electromagnetic force influence of electric magnet. The product of electric current in number of ampere turns and coil turn and one-turn coil. In the unsaturated situation of magnetic flux, number of ampere turns is more big, and electromagnetic force is more big; Working gas gap is more little, and electromagnetic force is more big. Due to electromagnetic valve open time be often in electric magnet working gas gap maximum in, and when closing be often electric magnet works breath minimum time, therefore firing current than close electric current big.
The electromagnetic valve of current Hydraulic Field adopts conventional PWM to control mostly, namely control circuit inputs a high-order voltage to electromagnetic valve, electromagnetic valve coil produces electric current, increase along with electric current, the electromagnetic force that electric magnet produces also increases therewith, when electromagnetic force increases to and is enough to overcome all kinds of resistance, electromagnetic force DM does adhesive campaign; When high-order voltage is withdrawn, in coil, electric current declines, and consequent electromagnetic force also reduces therewith, until electromagnetic force is not enough to overcome restoring force, now the spool of electromagnetic valve does reseting movement under the effect of restoring force. This control mode realizes the frequency of electromagnetic valve switch by regulating the frequency of square-wave signal, realizes electromagnetic valve opening and closing time within a signal period by regulating the dutycycle of square-wave signal.
But, this control mode comes with some shortcomings in the occasion that the dynamic response requirement to valve is higher. First it is certain delayed to be that the inductance of coil and electric magnet causes that the keying of valve exists, and namely needs through certain lag time after voltage signal input, and spool just can move, and voltage signal is withdrawn and is also required to through the regular hour, and spool just can reset. Under many circumstances, user is in order to pass through the control changing the realization of control signal dutycycle to valve opening time, and when valve has been switched on, in order to be held open state, voltage is still within a high position, and the electric current being thus easily caused in coil continues to rise. The lasting rising of electric current, causes coil excessive heating, energy excessive loss on the one hand; Can cause when pwm control signal is in low level (namely high voltage is withdrawn) on the other hand, owing in coil, electric current is excessive, just need to being down to the closedown electric current needed for closed electromagnetic valve through longer time current, the shut-in time thus caused increase is inevitable.In order to solve the problems referred to above, at present it has been proposed that multivoltage switches the mode of power supply, but during multivoltage switching power supply, if the switching time of voltage can not be got hold of, by causing the phenomenon of two or more power supply short circuit, cause a serious accident.
More it is contemplated that, the operating mode of electromagnetic valve often changes, the change of oil-in, control mouth and oil-out oil pressure can cause that spool stress changes, this just makes the required electromagnetic force change that electromagnetic valve opens and closes, so that electromagnetic valve opens and closes required electric current and changes. The change opening and closing required current value also will necessarily result in the change of lag time, and therefore under conventional PWM control method, the dynamic property of valve is easily by the impact of operating mode, it is impossible to provide stable, the performance of strong interference immunity.
Summary of the invention
In order to solve above-mentioned difficult point, the present invention proposes a kind of electromagnetic valve intelligence control system based on voltage PWM. This intelligence control system includes control signal generator, occupancy controller, voltage source, amperometric, fuel tank, electromagnetic valve, pressure transducer A, pressure transducer B, arithmetical unit, signal comparator; Control signal generator, occupancy controller, voltage source, amperometric, electromagnetic valve are sequentially connected, fuel tank is connected with the oil-out of electromagnetic valve, pressure transducer A is used for detecting electromagnetic valve work mouth oil pressure, and pressure transducer B is used for detecting electromagnetic valve oil-in oil pressure; Pressure transducer A is connected with arithmetical unit respectively with pressure transducer B, and arithmetical unit is connected with signal comparator by two paths of signals, and signal comparator is also connected with control signal generator, occupancy controller, amperometric respectively.
Described control signal is frequency and the adjustable square wave of dutycycle. During control signal square wave rising edge, trigger the signal of occupancy controller output duty cycle 100% to voltage source, and trigger signal A and compare constantly with amperometric fed back values; During control signal square wave trailing edge, trigger the signal of occupancy controller output duty cycle-100% to voltage source, and trigger signal B and compare constantly with amperometric fed back values.
The effect of described signal comparator: when comparing function is triggered constantly for signal A and amperometric fed back values, amperometric fed back values and signal A are compared constantly, when amperometric fed back values is more than signal A, forbid comparing constantly of amperometric fed back values and signal A, and export signal τ to occupancy controller; When comparing function is triggered constantly for signal B and amperometric fed back values, amperometric fed back values and signal B are compared constantly, when amperometric fed back values is less than signal B, forbid comparing constantly of amperometric fed back values and signal B, and export signal 0 to occupancy controller.
Described arithmetical unit is for being calculated the detected value of pressure transducer A and pressure transducer B, and exports two signals: signal A, signal B. Signal A is electromagnetic valve firing current under this operating mode, and signal B is electromagnetic valve closedown electric current under this operating mode.
Described amperometric is for the electric current in measure loop, and detected value is delivered to signal comparator, and signal comparator is by by electric current in loop and signal A and signal B contrast, exporting corresponding signal to occupancy controller.
Described electromagnetic valve is the control object of this intelligence control system.
The effect of described pressure transducer A and pressure transducer B: detection controls the oil pressure of mouth A and the oil pressure of oil inlet P, and detected value is delivered to arithmetical unit.
The invention have the advantages that:
1) pressure transducer of electromagnetic valve oil-in and working hole can detect oil pressure constantly, and feeds back to arithmetical unit, and arithmetical unit automatically calculates firing current according to the data that this electromagnetic valve early stage is tested and closes electric current;
2) pressure transducer and arithmetical unit with the use of, even if the operating mode of electromagnetic valve changes in work process, intelligence control system also can regulate according to the force value that sensor reads intelligently, makes electromagnetic valve have the adaptive ability to operating mode;
3) mode that univoltage source is powered by duty cycle adjustment, reduces the electric current of coil and the heat production of coil to the full extent;
4) comparing the control mode of multivoltage switching power supply, this invention, only with single-voltage-supply cmos, realizes, by the method for duty cycle adjustment, the effect that voltage switching is powered.
5) control mode of univoltage source duty cycle adjustment is absent from many power supplys switching phenomenon, and therefore the phenomenon of the short circuit that power supply switching causes there will not be, and work is by more stable.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention.
Fig. 2 is control signal and the current curve diagram of the present invention.
In figure: 1, control signal generator, 2, occupancy controller, 3, voltage source, 4, amperometric, 5, fuel tank, 6, electromagnetic valve, 7-1, pressure transducer A, 7-2, pressure transducer B, 8, arithmetical unit, 9-1, signal A, 9-2, signal B, 10, signal comparator.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be further described.
As it is shown in figure 1, this intelligence control system includes control signal generator, occupancy controller, voltage source, amperometric, fuel tank, electromagnetic valve, pressure transducer A, pressure transducer B, arithmetical unit, signal comparator; Control signal generator, occupancy controller, voltage source, amperometric, electromagnetic valve are sequentially connected, fuel tank is connected with the oil-out of electromagnetic valve, pressure transducer A is used for detecting electromagnetic valve work mouth oil pressure, and pressure transducer B is used for detecting electromagnetic valve oil-in oil pressure; Pressure transducer A is connected with arithmetical unit respectively with pressure transducer B, and arithmetical unit is connected with signal comparator by two paths of signals, and signal comparator is also connected with control signal generator, occupancy controller, amperometric respectively.
This intelligence control system is before use, first measure the resistance R of electromagnetic valve, and control object electromagnetic valve is tested, i.e. electric current (I_C) when electric current (I_O) at different inlet pressures (P_P) and when controlling that under mouth pressure (P_A), electromagnetic valve is opened and closed electromagnetic valve. (, under released state, owing to air gap is in maximum, the number of ampere turns needed for therefore making electromagnetic actuation is bigger for the electric magnet in electromagnetic valve; Electric magnet is under attracting state, and owing to air gap is in minima, the number of ampere turns therefore making electric magnet release required is less; Thus cause electric current (I_O) when electromagnetic valve is opened than closed electromagnetic valve time electric current (I_C) big). The product of τ and voltage source voltage value should be slightly bigger than resistance R and closes the product of electric current (I_C).
The working mechanism of this intelligent controller is: the data before using according to system, electromagnetic valve tested, with software, data are carried out Function Fitting, obtain electromagnetic valve firing current (I_O) and closed electromagnetic valve electric current (I_C) and P_P and P_A function expression. And by electromagnetic valve firing current (I_O) and closed electromagnetic valve electric current (I_C) respectively through signal A and signal B write signal comparator.
The working mechanism of signal comparator is: when comparing function is triggered constantly for signal A and amperometric fed back values, amperometric fed back values and signal A are compared constantly, when amperometric fed back values is more than signal A, forbid comparing constantly of amperometric fed back values and signal A, and export signal τ to occupancy controller; When comparing function is triggered constantly for signal B and amperometric fed back values, amperometric fed back values and signal B are compared constantly, when amperometric fed back values is less than signal B, forbid comparing constantly of amperometric fed back values and signal B, and export signal 0 to occupancy controller.
As in figure 2 it is shown, control signal is outside for controlling the signal of electromagnetic valve switch frequency and opening and closing time. The frequency of control signal and the target operating frequency of electromagnetic valve, the dutycycle of control signal and electromagnetic valve target opening time and cycle time ratio. Under original state, in loop, electric current is 0, and control signal produces square-wave pulse signal. During control signal rising edge, signal comparator triggering signal A compares constantly with amperometric fed back values. Meanwhile, the signal of occupancy controller output 100% is to voltage source, and voltage source receives after the signal of occupancy controller, and output duty cycle is the square wave of 100%. Under the power supply of the square-wave voltage that dutycycle is 100%, electric current rapid increase in loop, in electric current uphill process, amperometric value of feedback compares constantly with signal A (I_O), when amperometric value of feedback is more than (I_O) (because current value reaches (I_O), so now electromagnetic valve is opened), signal comparator output signal τ is to occupancy controller, and forbids comparing constantly of signal A and amperometric fed back values. Occupancy controller output duty cycle is the voltage square wave signal of τ, voltage source is the voltage square wave of τ receiving beginning output duty cycle after the square-wave signal of occupancy controller, due to voltage source this as a high frequency square wave voltage source, therefore accounting be τ square wave can Approximate Equivalent in the DC voltage being sized to τ and magnitude of voltage product. Under the DC-voltage supply of this equivalence, in coil, electric current begins to decline, and it is stable a numerically fuctuation within a narrow range slightly larger than closed path (I_C), until control signal is become low level by a high position, control signal produces trailing edge, and signal comparator triggering signal B compares constantly with amperometric fed back values. Meanwhile, the signal of occupancy controller output-100% is to voltage source, and voltage source receives after the signal of occupancy controller, and output duty cycle is the square wave of-100%. Under the power supply of the square-wave voltage that dutycycle is-100%, electric current rapid decrease in loop, in electric current decline process, amperometric value of feedback compares constantly with signal B (I_C), when amperometric value of feedback is less than (I_C) (because current value reaches (I_C), so now closed electromagnetic valve), signal comparator output signal 0 gives occupancy controller, and forbids comparing constantly of signal B and amperometric fed back values. Occupancy controller output duty cycle be the square-wave signal of 0 to power supply, voltage source is after the signal receiving arrival occupancy controller, and starting output duty cycle is the voltage square wave of 0, does not namely power. In coil, electric current slowly declines. So far, one switch periods of electromagnetic valve terminates. When control signal exports high signal again, control circuit carries out the control to electromagnetic valve still according to above-mentioned principle.
In this control system, the action time of voltage source different duty is all determine according to the value of electric current in loop.As long as electromagnetic valve one is opened, 100% dutycycle is just replaced with τ, and in coil, electric current does not just continue to rise thus, and the coil thus brought reduces heating and energy-saving benefit cannot be estimated. If closed electromagnetic valve,-100% dutycycle is just replaced with 0 at once, coil now still has less electric current, thus, when next switch periods arrives, in coil, electric current has had less electric current, then the time rising to firing current will reduce, and the method is conducive to the faster unlatching of electromagnetic valve in the next cycle.
Above-mentioned detailed description of the invention is used for illustrating the present invention, rather than limits the invention, in the spirit and scope of the claims of the present invention, and any amendment that the present invention is made and change, both fall within protection scope of the present invention.
Claims (8)
1. the electromagnetic valve intelligence control system based on voltage PWM, it is characterised in that: include control signal generator (1), occupancy controller (2), voltage source (3), amperometric (4), fuel tank (5), electromagnetic valve (6), pressure transducer A (7-1), pressure transducer B (7-2), arithmetical unit (8), signal comparator (10); Control signal generator (1), occupancy controller (2), voltage source (3), amperometric (4), electromagnetic valve (6) are sequentially connected, fuel tank (5) is connected with the oil-out of electromagnetic valve (6), pressure transducer A (7-1) is used for detecting electromagnetic valve work mouth oil pressure, and pressure transducer B (7-2) is used for detecting electromagnetic valve oil-in oil pressure; Pressure transducer A (7-1) and pressure transducer B (7-2) is connected with arithmetical unit (8) respectively, arithmetical unit (8) is connected with signal comparator (10) by two paths of signals, and signal comparator (10) is also connected with control signal generator (1), occupancy controller (2), amperometric (4) respectively.
2. the electromagnetic valve intelligence control system based on voltage PWM according to claim 1, it is characterised in that: the hydraulic switching valve that described electromagnetic valve (6) is high-speed opening and closing.
3. the control method of an electromagnetic valve intelligence control system as claimed in claim 1, it is characterized in that: arithmetical unit (8) obtains electromagnetic valve firing current and closed electromagnetic valve electric current according to the numerical value of pressure transducer A (7-1) and pressure transducer B (7-2), wherein electromagnetic valve firing current is assigned to signal A (9-1), closed electromagnetic valve electric current is assigned to signal B (9-2), control signal generator (1) output frequency and all adjustable rectangle square wave of dutycycle, control signal rising edge triggers signal comparator (10) and is compared constantly with amperometric fed back values by signal A (9-1), it is that negative signal is to voltage source that control signal trailing edge triggers occupancy controller output duty cycle, and trigger signal comparator (10) simultaneously signal B (9-2) is compared constantly with amperometric fed back values, signal comparator (10) exports corresponding signal to occupancy controller according to comparative result, occupancy controller controls the output of voltage source (3), it is achieved electromagnetic valve Based Intelligent Control.
4. the control method of electromagnetic valve intelligence control system according to claim 3, it is characterized in that when described signal A (9-1) is compared constantly with amperometric fed back values, when amperometric value of feedback is more than signal A (9-1), signal comparator exports corresponding control signal to occupancy controller, and forbid comparing constantly of signal A and amperometric fed back values, occupancy controller is receiving after the signal of signal comparator, output duty cycle is that the square-wave signal of τ is to voltage source, voltage source starts the voltage square wave that output duty cycle is τ, wherein 0 < τ < 1.
5. the control method of electromagnetic valve intelligence control system according to claim 3, it is characterized in that when signal B (9-2) is compared constantly by described signal comparator (10) with amperometric fed back values, when amperometric value of feedback is less than signal B (9-2), signal comparator exports corresponding control signal to occupancy controller, and forbid comparing constantly of signal B and amperometric fed back values, occupancy controller is receiving after the signal of signal comparator, output duty cycle is that the square-wave signal of 0 is to voltage source, voltage source starts the voltage square wave that output duty cycle is 0, namely do not power.
6. control method according to claim 3, it is characterized in that: storage described arithmetical unit has described electromagnetic valve firing current under different inlet pressures and working hole pressure and closes current values, and the data according to pressure transducer 1 (9-1) and pressure transducer 2 (9-2) obtain corresponding electromagnetic valve firing current and closed electromagnetic valve electric current.
7. control method according to claim 3, it is characterised in that: the signal that described occupancy controller produces is used for controlling voltage source, makes voltage source export relevant voltage waveform according to duty cycle signals,
When control signal rising edge, occupancy controller output duty cycle be the square-wave signal of 100% to voltage source,
When amperometric value of feedback is more than signal A (9-1), signal comparator outputs signal to occupancy controller, occupancy controller output duty cycle be the square-wave signal of τ to voltage source,
When control signal trailing edge, occupancy controller output duty cycle be the square-wave signal of-100% to voltage source,
When amperometric value of feedback is less than signal B (9-2), signal comparator outputs signal to occupancy controller, occupancy controller output duty cycle be the square-wave signal of 0 to voltage source, namely voltage source is not powered.
8. control method according to claim 3, it is characterised in that: when electromagnetic actuation in electromagnetic valve, voltage source output duty cycle is the voltage square wave of τ, and the electromagnetic force in electromagnetic valve can overcome restoring force, continues to electromagnetic actuation state.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107463091A (en) * | 2017-09-14 | 2017-12-12 | 杭州电子科技大学 | Applied to cell, the self-powered control system circuit of industrial water supply pipe network |
| CN109000025A (en) * | 2018-09-13 | 2018-12-14 | 东莞市德克韦尔能源技术有限公司 | A kind of electromagnetic valve controlling system with temperature-compensating |
| CN109826996A (en) * | 2019-03-28 | 2019-05-31 | 甘逸然 | A kind of low-power consumption electromagnetic valve drive dynamic control device and method |
| CN110580997A (en) * | 2018-06-11 | 2019-12-17 | 波凯特有限及两合公司 | Pulse width modulation control of solenoid valve |
| CN110597085A (en) * | 2019-08-20 | 2019-12-20 | 西安航天动力技术研究所 | Simulation model of static series compensator and distributed cluster simulation system |
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| CN107463091A (en) * | 2017-09-14 | 2017-12-12 | 杭州电子科技大学 | Applied to cell, the self-powered control system circuit of industrial water supply pipe network |
| CN110580997A (en) * | 2018-06-11 | 2019-12-17 | 波凯特有限及两合公司 | Pulse width modulation control of solenoid valve |
| CN109000025A (en) * | 2018-09-13 | 2018-12-14 | 东莞市德克韦尔能源技术有限公司 | A kind of electromagnetic valve controlling system with temperature-compensating |
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| CN109826996A (en) * | 2019-03-28 | 2019-05-31 | 甘逸然 | A kind of low-power consumption electromagnetic valve drive dynamic control device and method |
| CN109826996B (en) * | 2019-03-28 | 2020-05-08 | 甘逸然 | Low-power-consumption electromagnetic valve driving control device and method |
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| CN111810698A (en) * | 2020-01-07 | 2020-10-23 | 浙江工业大学 | High-dynamic high-frequency-response control method for electromagnetic valve based on voltage pulse width modulation technology |
| CN111810697B (en) * | 2020-01-07 | 2022-02-08 | 浙江工业大学 | High-dynamic control system and method for electromagnetic valve based on voltage pulse width modulation technology |
| CN111828714B (en) * | 2020-01-07 | 2022-03-11 | 浙江工业大学 | Electromagnetic valve rapid movement driving method based on voltage pulse width modulation technology |
| CN111828714A (en) * | 2020-01-07 | 2020-10-27 | 浙江工业大学 | Electromagnetic valve rapid movement driving method based on voltage pulse width modulation technology |
| CN111810697A (en) * | 2020-01-07 | 2020-10-23 | 浙江工业大学 | High-dynamic control system and method for electromagnetic valve based on voltage pulse width modulation technology |
| CN111834080A (en) * | 2020-04-24 | 2020-10-27 | 浙江工业大学 | Switching valve dynamic characteristic regulation and control method based on composite PWM |
| CN111834080B (en) * | 2020-04-24 | 2022-03-29 | 浙江工业大学 | Switching valve dynamic characteristic regulation and control method based on composite PWM |
| CN111609429A (en) * | 2020-05-09 | 2020-09-01 | 华帝股份有限公司 | Electromagnetic valve electricity-saving control system and method for kitchen range and gas stove |
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| CN111795198A (en) * | 2020-06-01 | 2020-10-20 | 浙江工业大学 | Method for realizing motion controllability of valve core of high-speed switch valve based on speed controller |
| CN113790298A (en) * | 2021-08-13 | 2021-12-14 | 浙江工业大学 | Control system and method capable of improving response speed and movement speed of electromagnetic valve |
| CN113790298B (en) * | 2021-08-13 | 2023-11-28 | 浙江工业大学 | Control system capable of improving response speed and movement speed of electromagnetic valve and method thereof |
| CN115097779A (en) * | 2022-06-28 | 2022-09-23 | 上海临港诺玛机电科技发展有限公司 | Control method for low heating of electromagnetic valve |
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