CN105889603B - A kind of PWM control methods for improving high-speed switch electromagnetic valve proportionality - Google Patents
A kind of PWM control methods for improving high-speed switch electromagnetic valve proportionality Download PDFInfo
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- CN105889603B CN105889603B CN201610356795.9A CN201610356795A CN105889603B CN 105889603 B CN105889603 B CN 105889603B CN 201610356795 A CN201610356795 A CN 201610356795A CN 105889603 B CN105889603 B CN 105889603B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0675—Electromagnet aspects, e.g. electric supply therefor
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Abstract
The invention discloses a kind of PWM control methods for improving high-speed switch electromagnetic valve proportionality, it is characterised in that：In high-speed switch electromagnetic valve as ratio control function in use, setting the frequency of the pwm control signal of the high-speed switch electromagnetic valve, high level and low level parameter to improve the ratio control function of high-speed switch electromagnetic valve.The present invention can effectively reduce the pressure fluctuations amplitude of high-speed switch electromagnetic valve, widen the proportion adjustment scope of high-speed switch electromagnetic valve and PWM effective control duty cycle range, improve the proportionality of high-speed switch electromagnetic valve.
Description
Technical field
It is specifically a kind of to improve speed-sensitive switch electromagnetism the present invention relates to a kind of driving method of high-speed switch electromagnetic valve
The PWM control methods of valve proportionality.
Background technology
The basic functional principle of high-speed switch electromagnetic valve is to be based on outside input pulsewidth modulation (Pulse Width
Modulation, PWM) electromagnet in control signal control valve produces or eliminates electromagnetic attraction, come and gone with band movable valve plug
While motion so that valve port is on or off state, it is achieved thereby that the break-make of liquid stream controls at valve port, in high-frequency PWM control
Signal processed can realize the ratio function spy of the valve port opening ratio control function of similar proportioning valve, referred to as high-speed switch electromagnetic valve
Property.
Domestic high-speed switch valve is limited in terms of performance, quality by production technology, and valve port is opened under pwm control signal
When spending carry out ratio control, ratio controlled range is limited and valve port is easier to standard-sized sheet or fully closed, effectively controls duty cycle range small, and one
As 30%~55%.
The parameter of high-speed switch electromagnetic valve structure mainly includes coil resistance, coil turn, spring rate, initialization gas
Gap, etc., on the premise of ensureing that high-speed switch valve is normally-open, close, there is ratio control function, coil turn and coil electricity
Resistance parameter mainly influences effective duty cycle operation interval, to magnetic valve ratio control range and effective duty cycle range effects very
Small, magnetic valve ratio control range and effectively control can be widened to a certain extent by changing spring rate and initialization air gap parameter
Duty cycle range processed, but improvement is little.Thus by the appropriate adjustment to these structural parameters to speed-sensitive switch electromagnetism
The ratio control range of valve and effectively widening for duty cycle range of control are had little effect, it is also necessary to which high-speed switch electromagnetic valve is set
Meter parameter is modified, and therefore, practicality is not strong.
Thus, the ratio control function of high-speed switch electromagnetic valve has that ratio controlled range is small and effective duty cycle model at present
Less drawback is enclosed, also is difficult to be obviously improved its proportionality by the structural parameters adjustment to magnetic valve, and cost is higher, adjusts
Section process is complicated, is unfavorable for the popularization and application of product.
The content of the invention
The present invention proposes a kind of improvement high-speed switch electromagnetic valve ratio to avoid the weak point present in above-mentioned prior art
The PWM control methods of example characteristic, to can effectively widen the ratio control range of high-speed switch electromagnetic valve and effectively control duty
Than scope, flow and the ratio control range of pressure that raising high-speed switch electromagnetic valve is controlled, realize more smart to valve port opening
Thin regulation and flow and pressure are more accurately adjusted, so as to improve the ratio control function of high-speed switch valve.
The present invention adopts the following technical scheme that to solve technical problem：
The present invention it is a kind of improve high-speed switch electromagnetic valve proportionality PWM control methods the characteristics of be：In the high speed
Switch electromagnetic valve is as ratio control function in use, the frequency for setting the pwm control signal of the high-speed switch electromagnetic valve is
Proportional frequency fP, the high level for setting the pwm control signal of the high-speed switch electromagnetic valve is ratio high level VPH, described in setting
The low level of the pwm control signal of high-speed switch electromagnetic valve is ratio low level VPL。
The characteristics of PWM control methods of the present invention, lies also in：
The proportional frequency fPFor maximum frequency values of the high-speed switch electromagnetic valve in normal operating frequency range；
The ratio high level VPHFor the rated operational voltage of the high-speed switch electromagnetic valve；
The ratio low level VPLIt is to adjust test method by pressure proportional to determine its span.
The pressure proportional regulation test method is to carry out as follows：
Step 1, the high-speed switch electromagnetic valve accessed into magnetic valve hydraulic test bench system, PWM control letter is set
Number frequency be the proportional frequency fP, the high level for setting the pwm control signal is the ratio high level VPH, institute is set
State the low level V of pwm control signalLFor 0V；
Step 2, definition duty cycle adjustment step pitch are Δ λ, voltage-regulation step pitch is Δ V, the low level VLRegulation time
Number is n, and initializes Δ λ=α, Δ V=β, n=1；
Step 3, the low level V with the pwm control signalLFor low levels of the 0V as (n-1)th regulationSet
The dutycycle of pwm control signal is 0, and the PWM that (n-1)th regulation is incrementally increased according to duty cycle adjustment step pitch Δ λ is controlled
The dutycycle of signal, and the relevant pressure for recording the magnetic valve hydraulic test bench system that the high-speed switch electromagnetic valve is controlled becomes
Change situation, when the pressure for the magnetic valve hydraulic test bench system that the high-speed switch electromagnetic valve is controlled starts increase, mark
The dutycycle of pwm control signal that pressure starts to increase corresponding to the moment during (n-1)th regulation isAnd continue according to duty
Than the dutycycle that regulation step pitch Δ λ incrementally increases the described (n-1)th time pwm control signal adjusted；When the speed-sensitive switch electromagnetism
When the pressure for the magnetic valve hydraulic test bench system that valve is controlled starts to remain unchanged, stop the duty of increase pwm control signal
Than；
Step 3, increase the low electricity that the low level of the pwm control signal is adjusted as n-th using voltage-regulation step pitch Δ V
It is flatJudge the dutycycle of the n-th regulationWhether it is " 0 "；If " 0 ", then according to duty cycle adjustment step pitch Δ λ by
Step increases the dutycycle of the pwm control signal of the n-th regulation；When the magnetic valve liquid that the high-speed switch electromagnetic valve is controlled
When the pressure of pressure experimental bench system starts to remain unchanged, stop the dutycycle of increase pwm control signal；Mark n-th regulation
The low level of pwm control signalFor Vmax；Otherwise, n+1 is assigned to n, and repeats step 3；
Step 4, the low level for reducing using voltage-regulation step pitch Δ V the pwm control signal are used as the low of (n+1)th regulation
LevelJudge the dutycycle of the n-th regulationWhether it is " 0 "；If " 0 ", then n+1 is assigned to n, and repeat
Perform step 4；Otherwise, accounting for for the pwm control signal of (n+1)th regulation is incrementally increased according to duty cycle adjustment step pitch Δ λ
Empty ratio；When the pressure for the magnetic valve hydraulic test bench system that the high-speed switch electromagnetic valve is controlled starts to remain unchanged, stop
Only increase the dutycycle of pwm control signal；The low level of the pwm control signal of (n+1)th regulation of markFor Vmin；
Step 5, the setting ratio low level VPLSpan be [Vmin,Vmax)。
Compared with the prior art, beneficial effects of the present invention are embodied in：
1st, the present invention improves the ratio of high-speed switch electromagnetic valve spy by adjusting the frequency in pwm control signal parameter
Property, the frequency adoption rate frequency of pwm control signal reduces the Oscillation Amplitude of high-speed switch electromagnetic valve valve element suspension, improved
The ratio control accuracy of valve port opening.
2nd, the present invention is opened at a high speed by adjusting voltage high level in pwm control signal parameter and voltage low level to improve
The proportionality of powered-down magnet valve, the voltage high level adoption rate high level of pwm control signal, voltage low level adoption rate are low
Level, the ratio control range of high-speed switch electromagnetic valve is widened and has effectively controlled duty cycle range, improved speed-sensitive switch electricity
The flow and the ratio control range of pressure that magnet valve is controlled, realize the regulation finer to valve port opening and to flow and pressure
Power is more accurately adjusted, and improves the ratio control function of high-speed switch electromagnetic valve on the whole.
3rd, the present invention realized to high-speed switch electromagnetic valve ratio control range by adjusting the parameter of pwm control signal and
Widening for duty cycle range is effectively controlled, the proportionality of high-speed switch electromagnetic valve is improved, without changing speed-sensitive switch electromagnetism
The parameter of structure design of valve, it is workable, and it is adapted to the high-speed switch electromagnetic valve of different type and parameter, it is applied widely.
4th, the present invention is widened by adjusting the frequency in pwm control signal parameter, voltage high level and voltage low level
High-speed switch electromagnetic valve ratio control range and effectively control duty cycle range, are the proportionalities for improving high-speed switch electromagnetic valve
Most simple and direct effective ways, effectively prevent improves speed-sensitive switch electromagnetism by designing the intelligent power drive circuit of magnetic valve
The proportionality of valve, reduces the hardware driving circuit cost of high-speed switch electromagnetic valve, and engineering application is stronger.
Brief description of the drawings
Fig. 1 is pwm control signal figure of the present invention；
Fig. 2 is the magnetic valve test system structure chart for the present invention.
Label in figure：1 hydraulic pump；2PWM signal generators；3 solenoid valve interfaces；4 pressure sensors；5 computers.
Embodiment
In the present embodiment, a kind of PWM control methods for improving high-speed switch electromagnetic valve proportionality, in speed-sensitive switch electromagnetism
Valve is as ratio control function in use, setting frequency, high level and the low level of the pwm control signal of high-speed switch electromagnetic valve
Parameter widens effective control duty cycle range of the proportion adjustment scope of high-speed switch electromagnetic valve and PWM, reduces speed-sensitive switch
The pressure fluctuations amplitude of magnetic valve, improve the proportionality of high-speed switch electromagnetic valve.Specifically,
Refering to Fig. 1, a kind of PWM control methods for improving high-speed switch electromagnetic valve proportionality, in high-speed switch electromagnetic valve
As ratio control function in use, the frequency for setting the pwm control signal of high-speed switch electromagnetic valve is proportional frequency fP, set
The high level of the pwm control signal of high-speed switch electromagnetic valve is ratio high level VPH, set the PWM of high-speed switch electromagnetic valve to control
The low level of signal is ratio low level VPL。
There is the critical frequency of work, typically about 200HZ in high-speed switch electromagnetic valve, when the frequency of pwm control signal is small
When critical frequency, high-speed switch electromagnetic valve easily occurs periodically opening and closing dynamic characteristic, speed-sensitive switch electricity
Magnet valve has been difficult to maintain full-gear under effect of inertia, is unfavorable for the realization of the ratio control function of high-speed switch electromagnetic valve,
Increase driving frequency, the ratio control range of high-speed switch electromagnetic valve and the effectively change of control duty cycle range are small, but valve
Core vibration amplitude reduces, and is advantageous to ratio control and the accurate adjustment of valve port opening.To ensure high-speed switch valve valve port opening
Ratio control function, the driving frequency of pwm control signal should be greater than the critical frequency of high-speed switch electromagnetic valve.Due to speed-sensitive switch
Magnetic valve has certain operating frequency range, in specific implementation, chooses the proportional frequency f of pwm control signalPFor speed-sensitive switch
Maximum frequency values of the magnetic valve in normal operating frequency range；
Choose the ratio high level V of pwm control signalPHFor the rated operational voltage of high-speed switch electromagnetic valve, generally height
The normal voltage of system, the high-speed switch electromagnetic valve used on automobile are generally direct current 12V voltages where fast switch electromagnetic valve
Driving, engineering truck and commercial car are generally direct current 24V voltages and driven, the ratio high level V of pwm control signal in the present inventionPH
Using the normal voltage of system where high-speed switch electromagnetic valve, without producing high pressure by booster circuit, can effectively reduce at a high speed
The cost of switch electromagnetic valve hardware driving circuit.
The ratio low level V of pwm control signalPLIt is to adjust test method by pressure proportional to determine its span.
Because high-speed switch electromagnetic valve has coil inductance L, can not be lifted rapidly in coil electricity coil current at initial stage, and
Armature and valve element are in initial position, armature working gas gap maximum, by improving the low level voltage of pwm control signal, increase line
Loop current and electromagnetic force, but caused electromagnetic force is also not enough to overcome the unlatching resistance of the magnetic valves such as return spring force, valve element position
Shifting is zero, and the aperture of magnetic valve is zero, but because preset electromagnetic force has partly overcome back-moving spring etc. to open resistance, when right
When high-speed switch electromagnetic valve open operation, speed-sensitive switch electricity can be completed by only needing the dutycycle of the pwm control signal of very little
The breakdown action of magnet valve, effectively reduce the unlatching dutycycle of pwm control signal.Thus by choosing rational pwm control signal
Low level voltage, the unlatching dutycycle of high-speed switch electromagnetic valve can be effectively reduced, widen effective control duty of pwm control signal
Compare scope.
In specific implementation, pressure proportional regulation test method is to carry out as follows：
Step 1, by high-speed switch electromagnetic valve access magnetic valve hydraulic test bench system, due to high-speed switch electromagnetic valve work
When in normal operating frequency range, the frequency of pwm control signal is bigger, and the amplitude of valve element vibrations is smaller, is more opened beneficial to valve port
The ratio control of degree and accurate adjustment, the frequency for setting pwm control signal are proportional frequency fP, i.e., high-speed switch electromagnetic valve is just
Maximum frequency values in normal operating frequency range, to improve the ratio control accuracy of high-speed switch electromagnetic valve, PWM is set to control letter
Number high level be ratio high level VPH, i.e. the rated operational voltage of high-speed switch electromagnetic valve, high-speed switch electromagnetic valve accessed
The normal voltage of system can typically meet to require, vehicle is generally direct current 12V or 24V, vehicle mounted electric with high-speed switch electromagnetic valve
The standard mains voltage in source can meet voltage supply requirement, determine that PWM is controlled in order to ensure adjusting test method by pressure proportional
The ratio low level V of signal processedPLThe ease for operation of process, the low level V of pwm control signal is setLFor 0V, and according to certain
Voltage-regulation step pitch increase low level VL, to avoid the low level V due to pwm control signalLToo high and voltage-regulation step pitch is set
Ratio low level V that is excessive and losing pwm control signal is setPLData, improve the accuracy rate of pressure proportional regulation test method；
Step 2, definition duty cycle adjustment step pitch are Δ λ, voltage-regulation step pitch is Δ V, low level VLRegulation number be
N, and initialize Δ λ=α, Δ V=β, n=1, Δ λ and Δ V initialization value are according to the design parameter of high-speed switch electromagnetic valve
It is determined that；
Step 3, the low level V with pwm control signalLFor low levels of the 0V as (n-1)th regulationPWM is set to control
The dutycycle of signal processed is 0, and the duty of the pwm control signal of (n-1)th regulation is incrementally increased according to duty cycle adjustment step pitch Δ λ
Than, and the consequent pressure change situation for the magnetic valve hydraulic test bench system that high-speed switch electromagnetic valve is controlled is recorded, when at a high speed
When the pressure for the magnetic valve hydraulic test bench system that switch electromagnetic valve is controlled starts increase, the pressure during regulation of mark (n-1)th time
Start increase the moment pressure bePressure starts to increase the pwm control signal corresponding to the moment during (n-1)th regulation of mark
Dutycycle beAnd continuation incrementally increases the pwm control signal of (n-1)th regulation according to duty cycle adjustment step pitch Δ λ
Dutycycle；When the pressure for the magnetic valve hydraulic test bench system that high-speed switch electromagnetic valve is controlled starts to remain unchanged, mark
Pressure start the to remain unchanged pressure at moment is during (n-1)th regulationPressure starts to maintain not during (n-1)th regulation of mark
Become the moment corresponding to pwm control signal dutycycle intoAnd stop increasing the dutycycle of pwm control signal；
Step 3, the low level adjusted using the low level of voltage-regulation step pitch Δ V increase pwm control signals as n-thJudge the dutycycle of n-th regulationWhether it is " 0 "；If " 0 ", then empty ratio is markedFor corresponding to " 0 " moment
Pressure isDue to the low level voltage of the preset pwm control signal being not zero, so that caused coil current and electromagnetic force
Also it is enough to overcome the magnetic valves such as electromagnetism and return spring force to open resistance in the case of being zero in the dutycycle of pwm control signal,
But the proportion adjustment scope of high-speed switch electromagnetic valve is also reduced, it is necessary to further determine that the low electricity of suitable pwm control signal
Ordinary telegram pressure, to ensure that electromagnetic force caused by the dutycycle as zero in pwm control signal is not enough to overcome electromagnetism and back-moving spring
The magnetic valves such as power open resistance, but only need the dutycycle of the pwm control signal of very little to meet to overcome magnetic valve to open resistance
Needs, to expand the effective duty cycle scope of pwm control signal；Continue to incrementally increase n-th according to duty cycle adjustment step pitch Δ λ
The dutycycle of the pwm control signal of secondary regulation；When the pressure for the magnetic valve hydraulic test bench system that high-speed switch electromagnetic valve is controlled
When power starts to remain unchanged, pressure start the to remain unchanged pressure at moment is during mark n-th regulationMark n-th regulation
When pressure start the to remain unchanged dutycycle of the pwm control signal corresponding to the moment beAnd stop increasing pwm control signal
Dutycycle；Mark the low level of the pwm control signal of n-th regulationFor Vmax；Otherwise, n+1 is assigned to n, and repeated
Perform step 3；
Step 4, using voltage-regulation step pitch Δ V reduce pwm control signal low level be used as (n+1)th time regulation low levelJudge the dutycycle of (n+1)th regulationWhether it is " 0 "；If " 0 ", then n+1 is assigned to n, and repeats step
Rapid 4；Otherwise, mark pressure start increase the moment pressure beDue to the preset pwm control signal low level being not zero
Coil current caused by voltage and electromagnetic force are not enough to overcome electromagnetism and answered in the case of being zero in the dutycycle of pwm control signal
The magnetic valves such as position spring force open resistance, but because caused preset electromagnetic force has partly overcome electromagnetism and back-moving spring etc. to open
Resistance is opened, when open operation to high-speed switch electromagnetic valve, only needing the dutycycle of the pwm control signal of very little can complete
The breakdown action of high-speed switch electromagnetic valve, the effective duty cycle scope of pwm control signal is expanded；Continue according to duty cycle adjustment
Step pitch Δ λ incrementally increases the dutycycle of the pwm control signal of (n+1)th regulation；When the electromagnetism that high-speed switch electromagnetic valve is controlled
When the pressure of valve hydraulic test bench system starts to remain unchanged, pressure starts the moment that remains unchanged during the regulation of mark (n+1)th time
Pressure isPressure start the to remain unchanged dutycycle of the pwm control signal corresponding to the moment is during the regulation of mark (n+1)th timeAnd stop increasing the dutycycle of pwm control signal；The low level of the pwm control signal of (n+1)th regulation of markFor
Vmin；
Step 5, setting ratio low level VPLSpan be [Vmin,Vmax)。
Embodiment：
The present embodiment carries out ratio drive control using the control method of the present invention to certain model high-speed switch electromagnetic valve, should
The parameter of model high-speed switch electromagnetic valve is as follows：Operating frequency range is 200HZ~1KHZ, rated operational voltage 12V, coil
The number of turn is 526 circles, and a diameter of 9mm of moving armature, initial air gap is 2.2mm, non-working-gap 0.2mm.Valve element maximum displacement is
1.0mm, moving-mass 0.0045kg, coil resistance are 6 ohm, and spring pre compressed magnitude is 2.0mm, and spring rate is
1300N·m-1, viscous damping coefficient is 1.4Nms-1, the force coefficient that surges is 0.005 × 2E6Nm-1, space permeability is
4πE-7H·m-1, opacity 0.5mm.
Magnetic valve hydraulic test system as shown in Figure 2, wherein 1 is hydraulic pump, for producing hydraulic pressure, 2 be that PWM believes
Number generator, for producing different frequency, high level, low level and the pwm control signal of dutycycle, 3 be solenoid valve interface, is used
In access high-speed switch electromagnetic valve, 4 be pressure sensor, and for detecting the pressure of hydraulic system, 5 be computer, for recording
The pressure change process of pressure sensor, the magnetic valve that the high-speed switch electromagnetic valve is accessed in magnetic valve hydraulic test system is connect
Mouth 2, hydraulic pump is set to produce 2Mpa hydraulic pressure.
Proportionality of the high-speed switch electromagnetic valve under conventional pwm control signal parameter is tested first, to ensure to open at a high speed
The ratio function of powered-down magnet valve, the frequency of pwm control signal are significantly larger than the critical frequency that high-speed switch electromagnetic valve has work,
For 200HZ, the frequency for taking pwm control signal is respectively the critical frequency of the high-speed switch electromagnetic valve used in the present embodiment
500HZ, 800HZ and 1KHZ, high level are direct current 12V, and low level is the ratio control that 0V carries out high-speed switch electromagnetic valve, is calculated
Machine 5 records the pressure changing of high-speed switch electromagnetic valve, it is known that ratio of the frequency of pwm control signal to high-speed switch electromagnetic valve
Example adjustable range, effective control duty cycle range of pwm signal are but bigger with the frequency of pwm control signal substantially without influence,
The pressure amplitude of high-speed switch electromagnetic valve reduces, and is fine-tuned beneficial to the ratio of high-speed switch electromagnetic valve, different PWM controls
The pressure proportional control range of high-speed switch electromagnetic valve under signal frequency is 0.32Mpa~1.98Mpa, pwm signal it is effective
It is 72%~91% to control duty cycle range.
High-speed switch electromagnetic valve ratio Control experiment is carried out below as the method to set up of the pwm control signal of the present invention.
Can by proportionality experimental test result of the above-mentioned high-speed switch electromagnetic valve under conventional pwm control signal parameter
Know, the frequency of pwm control signal is to the proportion adjustment scope of high-speed switch electromagnetic valve, effective control dutycycle model of pwm signal
Enclose substantially without influence, but increase with the frequency of pwm control signal, the pressure amplitude of high-speed switch electromagnetic valve reduces, profit
Fine-tuned in the ratio of high-speed switch electromagnetic valve, thus choose the proportional frequency of the pwm control signal of high-speed switch electromagnetic valve
fPThe maximum frequency values for being high-speed switch electromagnetic valve in normal operating frequency range, i.e.,：1KHZ；High-speed switch electromagnetic valve is set
Pwm control signal ratio high level VPHFor the rated operational voltage of high-speed switch electromagnetic valve, i.e.,：Direct current 12V；Above-mentioned PWM
The proportional frequency f of control signalPWith ratio high level VPHProduced by PWM signal generator 2.
The ratio low level V of pwm control signalPLSpan by pressure proportional adjust test method determine, specifically
Step is as follows：
Step 1, high-speed switch electromagnetic valve accessed into magnetic valve hydraulic test bench system, the frequency of pwm control signal is set
For proportional frequency fP=1KHZ, the high level for setting pwm control signal are ratio high level VPH=12V, to avoid because PWM is controlled
The low level V of signal processedLSet too high and voltage-regulation step pitch that ratio low level V that is excessive and losing pwm control signal is setPL
Data, the accuracy rate of pressure proportional regulation test method is improved, the low level V of pwm control signal is setLFor 0V, and according to one
Fixed voltage-regulation step pitch increase low level VL；
Step 2, definition duty cycle adjustment step pitch are Δ λ, voltage-regulation step pitch is Δ V, low level VLRegulation number be
N, Δ λ and Δ V initialization value determine according to the design parameter of high-speed switch electromagnetic valve, choose Δ λ=α in the present embodiment
=1%, Δ V=β=0.1V, initialization regulation frequency n=1 is chosen；
Step 3, the low level that the 0th pwm control signal adjusted is setThe duty of pwm control signal is set
Than for 0, the dutycycle of the pwm control signal of the 0th regulation is incrementally increased according to duty cycle adjustment step pitch 1%, and record at a high speed
The consequent pressure change situation for the magnetic valve hydraulic test bench system that switch electromagnetic valve is controlled, when high-speed switch electromagnetic valve is controlled
When the pressure of the magnetic valve hydraulic test bench system of system starts increase, pressure starts to increase the pressure at moment during the regulation of mark the 0th time
Power isThe dutycycle that pressure starts to increase the pwm control signal corresponding to the moment during regulation of mark the 0th time isAnd continue to incrementally increase the dutycycle of the pwm control signal of the 0th regulation according to duty cycle adjustment step pitch 1%；When
When the pressure for the magnetic valve hydraulic test bench system that high-speed switch electromagnetic valve is controlled starts to remain unchanged, the 0th regulation of mark
When pressure start the to remain unchanged pressure at moment bePressure starts the moment that remains unchanged during the 0th regulation of mark
The dutycycle of corresponding pwm control signal isAnd stop increasing the dutycycle of pwm control signal；It can thus be appreciated that
High-speed switch electromagnetic valve adjusts the low level result of the test of pwm control signal at the 0th time with above-mentioned high-speed switch electromagnetic valve normal
The proportionality experimental test result advised under pwm control signal parameter is basically identical, the pressure proportional control of high-speed switch electromagnetic valve
Scope processed is 0.31Mpa~1.99Mpa, and the effective of pwm signal controls duty cycle range as 72%~91%.
Step 3, the low level that the 1st pwm control signal adjusted is setFor voltage-regulation step pitch 0.1V, according to step
Rapid 2 experimental working technique, the dutycycle of the 1st regulation of markDue to the dutycycle of the 1st regulation
It is not " 0 ", then is assigned to n by 2, and repeat step 3；Above-mentioned test operation is repeated, when the 89th regulation of progress
The low level of pwm control signalWhen, the dutycycle of the 89th regulation of mark isDue toThen mark
Empty ratioFor the pressure corresponding to " 0 " momentBecause the low level of preset pwm control signal is 8.9V, with
Also it is enough to overcome electromagnetism and multiple in the case that to cause its caused coil current and electromagnetic force be zero in the dutycycle of pwm control signal
The magnetic valves such as position spring force open resistance, complete to open；Continue to incrementally increase the 89th regulation according to duty cycle adjustment step pitch 1%
Pwm control signal dutycycle；When the pressure for the magnetic valve hydraulic test bench system that high-speed switch electromagnetic valve is controlled starts
When remaining unchanged, pressure start the to remain unchanged pressure at moment is during the regulation of mark the 89th timeMark the 89th time
Pressure start the to remain unchanged dutycycle of the pwm control signal corresponding to the moment is during regulationAnd stop increasing PWM
The dutycycle of control signal；The low level of the pwm control signal of the 89th regulation of markFor Vmax=8.9V；
Step 4, the low level that the 90th pwm control signal adjusted is setTo be reduced with voltage-regulation step pitch 0.1V
The low level of pwm control signal, i.e.,The dutycycle of the regulation of mark the 90th time isDue toIt is not
" 0 ", then pressure is marked to start to increase the pressure at momentBecause preset pwm control signal low level is 8.8V
Caused coil current and electromagnetic force are not enough to overcome electromagnetism in the case of being zero in the dutycycle of pwm control signal and reset bullet
The magnetic valves such as spring force open resistance, but because caused preset electromagnetic force has partly overcome the unlatchings such as electromagnetism and back-moving spring to hinder
Power, when open operation to high-speed switch electromagnetic valve, the dutycycle of pwm control signal can be completed to open at a high speed when being 1%
The breakdown action of powered-down magnet valve, the effective duty cycle scope of pwm control signal is expanded；Continue according to duty cycle adjustment step pitch
1% incrementally increases the dutycycle of the pwm control signal of the 90th regulation；When the magnetic valve hydraulic pressure that high-speed switch electromagnetic valve is controlled
When the pressure of experimental bench system starts to remain unchanged, pressure starts to remain unchanged the pressure at moment during the regulation of mark the 90th timePressure starts to remain unchanged the dutycycle of the pwm control signal corresponding to the moment during regulation of mark the 90th timeAnd stop increasing the dutycycle of pwm control signal；The low level of the pwm control signal of the 90th regulation of mark
Step 5, setting ratio low level VPLSpan be [Vmin,Vmax)=[8.8V, 8.9V).
In the present embodiment, the ratio low level V of pwm control signal is chosenPL=8.8V, then high-speed switch electromagnetic valve is in PWM
The proportional frequency f of control signalP=1KHZ, ratio high level VPH=12V, ratio low level VPLThe ratio control of the parameters such as=8.8V
Under system, the pressure proportional control range of high-speed switch electromagnetic valve is 0.11Mpa~2.0Mpa, effective control duty of pwm signal
It is 1%~66% than scope, high-speed switch electromagnetic valve pressure proportional control range under conventional pwm control signal parameter is
0.32Mpa~1.98Mpa, pwm signal it is effective control duty cycle range be 72%~91%, using PWM controlling parties of the present invention
The pressure proportional control range and effective duty cycle scope of high-speed switch electromagnetic valve under method have obtained significantly widening, and
The frequency of pwm control signal is bigger, and the pressure amplitude of high-speed switch electromagnetic valve reduces, beneficial to the ratio of high-speed switch electromagnetic valve
Example fine-tunes.
The proportionality of high-speed switch electromagnetic valve can effectively be optimized using the PWM control methods of the present invention, reduce height
The pressure fluctuations amplitude of fast switch electromagnetic valve, control and fine-tune beneficial to the ratio of high-speed switch electromagnetic valve, widened at a high speed
The proportion adjustment scope of switch electromagnetic valve and PWM effective control duty cycle range.
Claims (1)
1. a kind of PWM control methods for improving high-speed switch electromagnetic valve proportionality, its feature exist：In the speed-sensitive switch electromagnetism
Valve is as ratio control function in use, the frequency for setting the pwm control signal of the high-speed switch electromagnetic valve is proportional frequency
fP, the proportional frequency fPFor maximum frequency values of the high-speed switch electromagnetic valve in normal operating frequency range；Described in setting
The high level of the pwm control signal of high-speed switch electromagnetic valve is ratio high level VPH, the ratio high level VPHFor the high speed
The rated operational voltage of switch electromagnetic valve；Set the low level of the pwm control signal of the high-speed switch electromagnetic valve low for ratio
Level VPL, the ratio low level VPLIt is to adjust test method by pressure proportional to determine its span；The pressure proportional
It is to carry out as follows to adjust test method：
Step 1, by the high-speed switch electromagnetic valve access magnetic valve hydraulic test bench system, the pwm control signal is set
Frequency is the proportional frequency fP, the high level for setting the pwm control signal is the ratio high level VPH, described in setting
The low level V of pwm control signalLFor 0V；
Step 2, definition duty cycle adjustment step pitch are Δ λ, voltage-regulation step pitch is Δ V, the low level VLRegulation number be n,
And initialize Δ λ=α, Δ V=β, n=1；
Step 3, the low level V with the pwm control signalLFor low levels of the 0V as (n-1)th regulationPWM is set to control
The dutycycle of signal processed is 0, and the pwm control signal of (n-1)th regulation is incrementally increased according to duty cycle adjustment step pitch Δ λ
Dutycycle, and record the consequent pressure change feelings for the magnetic valve hydraulic test bench system that the high-speed switch electromagnetic valve is controlled
Condition, when the pressure for the magnetic valve hydraulic test bench system that the high-speed switch electromagnetic valve is controlled starts increase, mark (n-1)th
The dutycycle of pwm control signal that pressure starts to increase corresponding to the moment during secondary regulation isAnd continue to adjust according to dutycycle
Section step pitch Δ λ incrementally increases the dutycycle of the pwm control signal of (n-1)th regulation；When the high-speed switch electromagnetic valve institute
When the pressure of the magnetic valve hydraulic test bench system of control starts to remain unchanged, stop the dutycycle of increase pwm control signal；
Step 3, increase the low level that the low level of the pwm control signal is adjusted as n-th using voltage-regulation step pitch Δ VJudge the dutycycle of the n-th regulationWhether it is " 0 "；If " 0 ", then according to duty cycle adjustment step pitch Δ λ progressively
Increase the dutycycle of the pwm control signal of the n-th regulation；When the magnetic valve hydraulic pressure that the high-speed switch electromagnetic valve is controlled
When the pressure of experimental bench system starts to remain unchanged, stop the dutycycle of increase pwm control signal；Mark the PWM of n-th regulation
The low level of control signalFor Vmax；Otherwise, n+1 is assigned to n, and repeats step 3；
Step 4, the low level for reducing using voltage-regulation step pitch Δ V the pwm control signal are used as the low level of (n+1)th regulationJudge the dutycycle of the n-th regulationWhether it is " 0 "；If " 0 ", then n+1 is assigned to n, and repeat
Step 4；Otherwise, the dutycycle of the pwm control signal of (n+1)th regulation is incrementally increased according to duty cycle adjustment step pitch Δ λ；
When the pressure for the magnetic valve hydraulic test bench system that the high-speed switch electromagnetic valve is controlled starts to remain unchanged, stop increase
The dutycycle of pwm control signal；The low level of the pwm control signal of (n+1)th regulation of markFor Vmin；
Step 5, the setting ratio low level VPLSpan be [Vmin,Vmax)。
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| CN110094565B (en) * | 2019-05-08 | 2020-08-07 | 合肥工业大学 | Control method for reducing closing time delay of high-speed switch electromagnetic valve |
| CN110865225B (en) * | 2019-12-02 | 2021-11-09 | 合肥工业大学 | Proportional valve current acquisition method and system and electronic equipment |
| US11459966B2 (en) * | 2019-12-20 | 2022-10-04 | Pratt & Whitney Canada Corp. | Systems and methods for operating an on-off valve |
| CN113700926A (en) * | 2021-09-03 | 2021-11-26 | 山东日发纺织机械有限公司 | Driving method of electromagnetic valve and related assembly |
| CN114036684B (en) * | 2021-11-19 | 2024-05-10 | 吉林大学 | Parameter adjusting method of high-speed switch valve |
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