CN105676690B - A kind of solenoid valve intelligence control system and its method based on voltage PWM - Google Patents
A kind of solenoid valve intelligence control system and its method based on voltage PWM Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- 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 kind of solenoid valve intelligence control system and its method based on voltage PWM, including control signal generator, occupancy controller, voltage source, current detector, fuel tank, solenoid valve, pressure sensor, arithmetic unit, signal comparator.The pressure sensor of solenoid valve oil inlet and working hole can constantly detect oil pressure, and feed back to arithmetic unit, and arithmetic unit calculates firing current according to the data of solenoid valve test early period and closes electric current automatically；Pressure sensor and arithmetic unit are used cooperatively, even if the operating mode of solenoid valve changes in the course of work, intelligence control system also can intelligently be adjusted according to the pressure value that sensor is read, and solenoid valve is made to have the adaptive ability to operating mode；The control mode of univoltage source duty cycle adjustment there will not be there is no more power supplys switching phenomenon caused by power supply switching the phenomenon that short circuit, and work will be more stable.
Description
Technical field
The present invention relates to a kind of solenoid valve intelligence control systems and its method based on voltage PWM.
Background technology
In the research of solenoid valve, number of ampere turns and working gas gap are maximum to the electromagnetic force influence of electromagnet.Number of ampere turns, that is, line
Enclose the number of turn and the product of electric current in one-turn coil.In the case of magnetic flux is unsaturated, number of ampere turns is bigger, and electromagnetic force is bigger；Work
Air gap is smaller, and electromagnetic force is bigger.Since solenoid valve is when opening when often working gas gap maximum in electromagnet, and close
When often work in electromagnet breath minimum when, therefore firing current is bigger than closing electric current.
For the solenoid valve of Hydraulic Field mostly using routine PWM controls, i.e. control circuit inputs a height to solenoid valve at present
Position voltage, solenoid valve coil generates electric current, and with the increase of electric current, the electromagnetic force that electromagnet generates also increases therewith, works as electricity
Magnetic force increases to when being enough to overcome all kinds of resistances, and electromagnetic force drive electromagnet does actuation movement；When high-order voltage is withdrawn, coil
Middle electric current declines, and resulting electromagnetic force also reduces therewith, until electromagnetic force is not enough to overcome restoring force, solenoid valve at this time
Spool does resetting movement under the action of restoring force.The control mode realizes that solenoid valve is opened by adjusting the frequency of square-wave signal
The frequency of pass realizes opening and closing time of the solenoid valve within a signal period by adjusting the duty ratio of square-wave signal.
However, the control mode comes with some shortcomings in the higher occasion of the dynamic response requirement to valve.It is coil first
Lead to the keying of valve there are certain lag with the inductance of electromagnet, i.e., when being needed after voltage signal input by certain lag
Between, spool can just move, and voltage signal, which is withdrawn, to be also required to by the regular hour, and spool can just reset.In many cases, it uses
Family by change in order to control signal dutyfactor to realize the control to valve opening time, in the case where valve has been switched on, in order to
It keeps it turned on, voltage is still within a high position, and the electric current being thus easy to cause in coil persistently rises.On the continuing of electric current
It rises, on the one hand causes coil excessive heating, energy excessive loss；On the other hand can cause to be in low level (i.e. in pwm control signal
High voltage is withdrawn) when, since electric current is excessive in coil, need to pass through longer time current can just be down to needed for solenoid valve closing
Electric current is closed, thus caused shut-in time increase is inevitable.To solve the above-mentioned problems, at present it has been proposed that mostly electric
Crush-cutting changes the mode of power supply, but during multivoltage switching power supply, if the switching time of voltage cannot be got hold of, will cause two
Or the phenomenon that multiple power supply short circuits, it causes a serious accident.
More it is contemplated that the operating mode of solenoid valve often changes, oil inlet, control mouth and oil outlet oil pressure
Variation can cause spool stress to change, this just makes the required electromagnetic force variation that solenoid valve opens and closes, so as to make electromagnetism
Valve opens and closes required electric current and changes.The variation of current value needed for opening and closing also will necessarily result in lag
The variation of time, therefore under conventional PWM control methods, the dynamic property of valve is easily influenced by operating mode, can not be provided steady
Fixed, the performance of strong interference immunity.
Invention content
In order to solve above-mentioned difficult point, the present invention proposes a kind of solenoid valve intelligent control system based on voltage PWM
System.The intelligence control system includes control signal generator, occupancy controller, voltage source, current detector, fuel tank, electromagnetism
Valve, pressure sensor A, pressure sensor B, arithmetic unit, signal comparator；Control signal generator, occupancy controller, voltage
Source, current detector, solenoid valve are sequentially connected, and fuel tank is connected with the oil outlet of solenoid valve, and pressure sensor A is used to detect electromagnetism
Valve working hole oil pressure, pressure sensor B are used to detect solenoid valve oil inlet oil pressure；Pressure sensor A and pressure sensor B difference
It is connected with arithmetic unit, arithmetic unit is connected by two paths of signals with signal comparator, and signal comparator is also sent out with control signal respectively
Raw device, occupancy controller, current detector are connected.
The control signal is frequency and the adjustable square wave of duty ratio.When controlling signal square wave rising edge, duty ratio is triggered
The signal of controller output duty cycle 100% to voltage source, and trigger signal A and current detector fed back values constantly compared with；
When controlling signal square wave failing edge, the signal of triggering occupancy controller output duty cycle -100% triggers letter to voltage source
Number B and current detector fed back values constantly compared with.
The effect of the signal comparator：When constantly comparing function is triggered for signal A and current detector fed back values,
Current detector fed back values and signal A are constantly compared, when current detector fed back values are more than signal A, are forbidden
Current detector fed back values and signal A's constantly compares, and output signal τ is to occupancy controller；It is examined in signal B and electric current
When surveying device fed back values constantly comparing function being triggered, current detector fed back values and signal B are constantly compared, work as electricity
When current sensor fed back values are less than signal B, forbid constantly comparing, and export letter for current detector fed back values and signal B
Number 0 gives occupancy controller.
The arithmetic unit exports two letters for the detected value of pressure sensor A and pressure sensor B to be calculated
Number：Signal A, signal B.Signal A is firing current of the solenoid valve under this operating mode, and signal B is pass of the solenoid valve under this operating mode
Close electric current.
The current detector is used for the electric current in measure loop, and detected value is sent to signal comparator, and signal compares
Device exports corresponding signal to occupancy controller by the way that electric current in circuit and signal A and signal B are compared.
The solenoid valve is the control object of the intelligence control system.
The effect of the pressure sensor A and pressure sensor B：The oil pressure of control mouth A and the oil pressure of oil inlet P are detected,
And detected value is sent to arithmetic unit.
The invention has the advantages that：
1) pressure sensor of solenoid valve oil inlet and working hole can constantly detect oil pressure, and feed back to arithmetic unit, fortune
Device is calculated to calculate firing current automatically according to the data of solenoid valve test early period and close electric current；
2) pressure sensor and arithmetic unit are used cooperatively, even if the operating mode of solenoid valve changes in the course of work, intelligence
Control system also can intelligently be adjusted according to the pressure value that sensor is read, and having solenoid valve should be able to the adaptive of operating mode
Power；
3) univoltage source to the full extent reduces the electric current and coil of coil by way of duty cycle adjustment power supply
Heat production；
4) compared to the control mode of multivoltage switching power supply, which passes through duty cycle adjustment only with single-voltage-supply cmos
Method realize voltage switching power supply effect.
5) caused by more power supplys switching phenomenon is not present in the control mode of univoltage source duty cycle adjustment, therefore power supply switches
The phenomenon that short-circuit, there will not be, and work will be more stable.
Description of the drawings
Fig. 1 is schematic diagram of the present invention.
Fig. 2 is the control signal and current curve diagram of the present invention.
In figure：1st, control signal generator, 2, occupancy controller, 3, voltage source, 4, current detector, 5, fuel tank, 6,
Solenoid valve, 7-1, pressure sensor A, 7-2, pressure sensor B, 8, arithmetic unit, 9-1, signal A, 9-2, signal B, 10, signal ratio
Compared with device.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and examples.
As shown in Figure 1, the intelligence control system includes control signal generator, occupancy controller, voltage source, electric current inspection
Survey device, fuel tank, solenoid valve, pressure sensor A, pressure sensor B, arithmetic unit, signal comparator；Control signal generator accounts for
Sky is sequentially connected than controller, voltage source, current detector, solenoid valve, and fuel tank is connected with the oil outlet of solenoid valve, pressure sensing
For detecting electromagnetic valve work mouth oil pressure, pressure sensor B is used to detect solenoid valve oil inlet oil pressure device A；Pressure sensor A and
Pressure sensor B is connected respectively with arithmetic unit, and arithmetic unit is connected by two paths of signals with signal comparator, and signal comparator also divides
It is not connected with control signal generator, occupancy controller, current detector.
The intelligence control system before use, first measures the resistance R of solenoid valve, and control object solenoid valve is surveyed
Examination, i.e., electric current (I_O) and electromagnetism when solenoid valve is opened under different inlet pressures (P_P) and control mouth pressure (P_A)
Electric current (I_C) when valve is closed.(electromagnet in solenoid valve, since air gap is in maximum value, makes electricity under discrete state
It is larger that magnet is attracted required number of ampere turns；Electromagnet, since air gap is in minimum value, releases electromagnet under attracting state
It is smaller to put required number of ampere turns；Electric current (I_C) when electric current (I_O) when thus causing the solenoid valve to open is closed than solenoid valve
Greatly).The product of τ and voltage source voltage value should be slightly bigger than resistance R with closing the product of electric current (I_C).
The working mechanism of the intelligent controller is：According to system using the preceding data to electromagnetism valve test, with software logarithm
According to Function Fitting is carried out, obtain solenoid valve firing current (I_O) and solenoid valve closes electric current (I_C) and P_P and P_A function representations
Formula.And solenoid valve firing current (I_O) and solenoid valve are closed into electric current (I_C), signal ratio is written by signal A and signal B respectively
Compared with device.
The working mechanism of signal comparator is：In signal A, constantly comparing function is triggered with current detector fed back values
When, current detector fed back values and signal A are constantly compared, when current detector fed back values are more than signal A, are prohibited
Only current detector fed back values and signal A constantly compare, and output signal τ is to occupancy controller；In signal B and electric current
Detector fed back values constantly compare current detector fed back values and signal B when constantly comparing function is triggered, when
When current detector fed back values are less than signal B, forbid constantly comparing, and export for current detector fed back values and signal B
Signal 0 gives occupancy controller.
As shown in Fig. 2, control signal is the external signal for being used to control electromagnetic valve switch frequency and opening and closing time.Control letter
Number frequency, that is, solenoid valve target operating frequency, control duty ratio i.e. solenoid valve target opening time and cycle time of signal
Than.Under original state, electric current is 0 in circuit, and control signal generates square-wave pulse signal.When controlling signal rising edge, signal ratio
Compared with device trigger signal A and current detector fed back values constantly compared with.At the same time, occupancy controller exports 100%
Signal is to voltage source, and after voltage source receives the signal from occupancy controller, output duty cycle is 100% square wave.
Duty ratio is electric current rapid increase in circuit under the power supply of 100% square-wave voltage, in electric current uphill process, current detecting
Compared with device value of feedback carries out constantly with signal A (I_O), when current detector value of feedback is more than (I_O) (because current value reaches
(I_O), so solenoid valve is opened at this time), signal comparator output signal τ is to occupancy controller, and disable signal A and electric current
Detector fed back values constantly compare.Occupancy controller output duty cycle is the voltage square wave signal of τ, and voltage source is receiving
To the voltage square wave that output duty cycle is τ is started after the square-wave signal of occupancy controller, since voltage source sheet is as one
A high frequency square wave voltage source, thus accounting be τ square wave can Approximate Equivalent in the DC voltage that size is τ and voltage value product.
Herein under equivalent DC-voltage supply, electric current is begun to decline in coil, and is stablized at one slightly larger than closed path (I_C)
Numerically fuctuation within a narrow range, until control signal becomes low level by a high position, control signal generates failing edge, signal comparator triggering letter
Number B and current detector fed back values constantly compared with.At the same time, occupancy controller exports -100% signal to voltage
Source, after voltage source receives the signal from occupancy controller, output duty cycle is -100% square wave.Duty ratio for-
Under the power supply of 100% square-wave voltage, electric current rapid decrease in circuit, during electric current decline, current detector value of feedback
Compared with being carried out constantly with signal B (I_C), and when current detector value of feedback is less than (I_C) (because current value reaches (I_C), institute
Closed with solenoid valve at this time), signal comparator output signal 0 gives occupancy controller, and disable signal B and current detector are anti-
Feedback numerical value constantly compares.To power supply, voltage source accounts for the square-wave signal that occupancy controller output duty cycle is 0 receiving
After sky is than the signal of controller, starts the voltage square wave that output duty cycle is 0, i.e., do not power.Electric current slowly declines in coil.Extremely
This, one switch periods of solenoid valve terminate.When signal is controlled to export high signal again, still according to above-mentioned in control circuit
Principle carries out the control to solenoid valve.
The action time of voltage source different duty is the value according to electric current in circuit come determining in the control system.
As long as soon as solenoid valve is opened, 100% duty ratio is replaced with τ, and thus electric current does not just continue to rise in coil, thus band
The coil come, which reduces fever and energy-saving benefit, to be estimated.As long as solenoid valve is closed, -100% duty ratio is just at once more
It changes 0 into, still there is smaller electric current in coil at this time, thus, when next switch periods arrive, there is electric current in coil
Smaller electric current, then rising to the time of firing current will be reduced, and this method is conducive in the next period solenoid valve more
It is fast to open.
Above-mentioned specific embodiment is used for illustrating the present invention rather than limiting the invention, the present invention's
In spirit and scope of the claims, to any modifications and changes that the present invention makes, the protection model of the present invention is both fallen within
It encloses.
Claims (6)
1. a kind of control method of the solenoid valve intelligence control system based on voltage PWM, the voltage PWM
Solenoid valve intelligence control system includes control signal generator (1), occupancy controller (2), voltage source (3), current detector
(4), fuel tank (5), solenoid valve (6), pressure sensor A (7-1), pressure sensor B (7-2), arithmetic unit (8), signal comparator
(10)；Control signal generator (1), occupancy controller (2), voltage source (3), current detector (4), solenoid valve (6) are sequentially
Be connected, fuel tank (5) is connected with the oil outlet of solenoid valve (6), pressure sensor A (7-1) for detecting electromagnetic valve work mouth oil pressure,
Pressure sensor B (7-2) is for detecting solenoid valve oil inlet oil pressure；Pressure sensor A (7-1) and pressure sensor B (7-2) points
It is not connected with arithmetic unit (8), arithmetic unit (8) is connected by two paths of signals with signal comparator (10), and signal comparator (10) is also
It is connected respectively with control signal generator (1), occupancy controller (2), current detector (4)；
The solenoid valve (6) is the hydraulic switching valve of high-speed opening and closing；
It is characterized in that：Arithmetic unit (8) obtains electromagnetism according to the numerical value of pressure sensor A (7-1) and pressure sensor B (7-2)
Valve firing current and solenoid valve close electric current, and wherein solenoid valve firing current is assigned to signal A (9-1), and solenoid valve closes electric current
Signal B (9-2), control signal generator (1) output frequency and the adjustable rectangle square wave of duty ratio are assigned to, is controlled on signal
Rise along trigger signal comparator (10) by signal A (9-1) and current detector fed back values constantly compared with；Control signal failing edge
Triggering occupancy controller output duty cycle be the signal born to voltage source, and simultaneously trigger signal comparator (10) by signal B
(9-2) and current detector fed back values constantly compared with, signal comparator (10) exports corresponding signal to accounting for according to comparison result
Sky realizes solenoid valve intelligent control than controller, the output of occupancy controller control voltage source (3).
2. the control method of the solenoid valve intelligence control system according to claim 1 based on voltage PWM, special
Sign be the signal A (9-1) and current detector fed back values constantly compared with when, when current detector value of feedback is more than signal
During A (9-1), signal comparator exports corresponding control signal to occupancy controller, and disable signal A and current detector are anti-
Feedback numerical value constantly compares, and for occupancy controller after the signal from signal comparator is received, output duty cycle is the side of τ
Wave signal is to voltage source, and voltage source starts the voltage square wave that output duty cycle is τ, wherein 0<τ<1.
3. the control method of the solenoid valve intelligence control system according to claim 1 based on voltage PWM, special
Sign be the signal comparator (10) by signal B (9-2) and current detector fed back values constantly compared with when, work as current detecting
When device value of feedback is less than signal B (9-2), signal comparator exports corresponding control signal to occupancy controller, and forbids letter
Number B and current detector fed back values constantly compared with, occupancy controller after the signal from signal comparator is received,
For the square-wave signal that output duty cycle is 0 to voltage source, voltage source starts the voltage square wave that output duty cycle is 0, i.e., does not power.
4. the control method of the solenoid valve intelligence control system according to claim 1 based on voltage PWM, special
Sign is：The arithmetic unit is stored with firing current and pass of the solenoid valve under different inlet pressures and working hole pressure
Current values are closed, and obtains corresponding solenoid valve according to the data of pressure sensor A (7-1) and pressure sensor B (7-2) and opens
Electric current and solenoid valve close electric current.
5. the control method of the solenoid valve intelligence control system according to claim 1 based on voltage PWM, special
Sign is：The signal that the occupancy controller generates makes voltage source according to duty cycle signals the output phase for controlling voltage source
Answer voltage waveform,
When controlling signal rising edge, the square-wave signal that occupancy controller output duty cycle is 100% to voltage source,
When current detector value of feedback is more than signal A (9-1), signal comparator outputs signal to occupancy controller, duty
Than square-wave signal that controller output duty cycle is τ to voltage source,
When controlling signal failing edge, the square-wave signal that occupancy controller output duty cycle is -100% to voltage source,
When current detector value of feedback is less than signal B (9-2), signal comparator outputs signal to occupancy controller, duty
Than controller output duty cycle be 0 square-wave signal to voltage source, i.e. voltage source is not powered.
6. the control method of the solenoid valve intelligence control system according to claim 1 based on voltage PWM, special
Sign is：When electromagnetic actuation in solenoid valve, voltage source output duty cycle is the voltage square wave of τ, the electromagnetic force in solenoid valve
Restoring force can be overcome, continue to electromagnetic actuation state.
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| DE102018113860A1 (en) * | 2018-06-11 | 2019-12-12 | Bürkert Werke GmbH & Co. KG | PWM control for solenoid valves |
| CN109000025B (en) * | 2018-09-13 | 2024-06-25 | 广东普洛测控科技有限公司 | Electromagnetic valve control system with temperature compensation |
| 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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| 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 |
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| CN111664288B (en) * | 2020-06-01 | 2021-11-30 | 浙江工业大学 | Method for considering both opening and closing dynamic characteristics and opening and closing buffer characteristics of high-speed switch valve |
| CN111664289B (en) * | 2020-06-01 | 2021-11-30 | 浙江工业大学 | Method for controlling opening and closing process of hydraulic valve through database and pulse width modulation |
| CN111795198B (en) * | 2020-06-01 | 2022-01-25 | 浙江工业大学 | Method for realizing motion controllability of valve core of high-speed switch valve based on speed controller |
| 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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