CN105889603A - PWM (Pulse Width Modulation) control method of improving proportion property of high-speed on-off solenoid valve - Google Patents
PWM (Pulse Width Modulation) control method of improving proportion property of high-speed on-off solenoid valve Download PDFInfo
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- CN105889603A CN105889603A CN201610356795.9A CN201610356795A CN105889603A CN 105889603 A CN105889603 A CN 105889603A CN 201610356795 A CN201610356795 A CN 201610356795A CN 105889603 A CN105889603 A CN 105889603A
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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 PWM (Pulse Width Modulation) control method of improving the proportion property of a high-speed on-off solenoid valve. The PWM control method is characterized in that when the high-speed on-off solenoid valve is used for proportion control, the frequency, high level and low level parameters of a PWM control signal of the high-speed on-off solenoid valve are set so as to improve the proportion control function of the high-speed on-off solenoid valve. The PWM control method has the beneficial effects that the pressure fluctuation range of the high-speed on-off solenoid valve can be effectively reduced, the proportion regulation range of the high-speed on-off solenoid valve and the effective control duty ratio range of the PWM are widened, and the proportion property of the high-speed on-off solenoid valve is improved.
Description
Technical field
The present invention relates to the driving method of a kind of high-speed switch electromagnetic valve, specifically one and improve high-speed switch electromagnetic valve ratio
The PWM control method of characteristic.
Background technology
The basic functional principle of high-speed switch electromagnetic valve be based on outside input pulsewidth modulation (Pulse Width Modulation,
PWM) electromagnet in control signal control valve produces or eliminates electromagnetic attraction, while carrying out back and forth movement with band movable valve plug,
Valve port is made to be in the state of opening or closing, it is achieved thereby that the break-make of liquid flow controls at valve port, can be real in high-frequency PWM control signal
The valve port opening ratio being now similar to proportioning valve controls the ratio functional characteristic of function, referred to as high-speed switch electromagnetic valve.
Domestic high-speed switch valve is limited by production technology in terms of performance, quality, to valve port opening under pwm control signal
When carrying 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 little, typically
30%～55%.
The parameter of high-speed switch electromagnetic valve structure mainly include coil resistance, coil turn, spring rate, initialization air gap,
Deng, ensureing that high-speed switch valve is normally-open, close, there is ratio control on the premise of function, coil turn and coil resistance
Parameter mainly affects effective duty cycle operation interval, the least to magnetic valve ratio control range and effective duty cycle range effects, changes
Become spring rate and initialization air gap parameter can be widened magnetic valve ratio control range to a certain extent and effectively control dutycycle
Scope, but improve and have little effect.Thereby through the suitably adjustment ratio control to high-speed switch electromagnetic valve to these structural parameters
Scope processed and effectively widening of duty cycle range of control have little effect, in addition it is also necessary to repair the design parameter of high-speed switch electromagnetic valve
Changing, therefore, practicality is the strongest.
Thus, it is little less with effective duty cycle scope to there is ratio controlled range in the ratio control function of current high-speed switch electromagnetic valve
Drawback, also be difficult to be obviously improved its proportionality by the structural parameters of magnetic valve are adjusted, and relatively costly, regulate process
Complexity, is unfavorable for the popularization and application of product.
Summary of the invention
The present invention is to avoid the weak point existing for above-mentioned prior art, proposes one and improves high-speed switch electromagnetic valve proportionality
PWM control method, to effectively widening the ratio control range of high-speed switch electromagnetic valve and effectively controlling duty cycle range,
Improve the flow that controlled of high-speed switch electromagnetic valve and the ratio control range of pressure, it is achieved the regulation finer to valve port opening and
Flow and pressure are regulated more accurately, thus the ratio improving high-speed switch valve controls function.
The present invention solves that technical problem adopts the following technical scheme that
The feature of a kind of PWM control method improving high-speed switch electromagnetic valve proportionality of the present invention is: at described speed-sensitive switch
When magnetic valve uses as ratio control function, the frequency of the pwm control signal arranging described high-speed switch electromagnetic valve is ratio
Frequency fP, the high level of the pwm control signal arranging described high-speed switch electromagnetic valve is ratio high level VPH, arrange described
The low level of the pwm control signal of high-speed switch electromagnetic valve is ratio low level VPL。
The feature of PWM control method of the present invention lies also in:
Described proportional frequency fPFor described high-speed switch electromagnetic valve maximum frequency values in normal operating frequency range；
Described ratio high level VPHRated operational voltage for described high-speed switch electromagnetic valve；
Described ratio low level VPLIt is to determine its span by pressure proportional regulation test method.
Described pressure proportional regulation test method is to carry out as follows:
Step 1, by described high-speed switch electromagnetic valve access magnetic valve hydraulic test bench system, described pwm control signal is set
Frequency be described proportional frequency fP, the high level arranging described pwm control signal is described ratio high level VPH, arrange
Low level V of described pwm control signalLFor 0V；
Step 2, definition duty cycle adjustment step pitch are Δ λ, voltage-regulation step pitch is Δ V, described low level VLRegulation number of times be
N, and initialize Δ λ=α, Δ V=β, n=1；
Step 3, with low level V of described pwm control signalLFor 0V as (n-1)th time regulation low levelIf
The dutycycle putting pwm control signal is 0, incrementally increases the PWM of described (n-1)th regulation according to duty cycle adjustment step pitch Δ λ
The dutycycle of control signal, and record the relevant pressure of the magnetic valve hydraulic test bench system that described high-speed switch electromagnetic valve is controlled
Situation of change, when the pressure of the magnetic valve hydraulic test bench system that described high-speed switch electromagnetic valve is controlled starts to increase, mark
During (n-1)th regulation, pressure starts to increase the dutycycle of the pwm control signal corresponding to the moment and isAnd continue according to accounting for
The dutycycle of the empty pwm control signal incrementally increasing described (n-1)th regulation than regulation step pitch Δ λ；When described speed-sensitive switch electricity
When the pressure of the magnetic valve hydraulic test bench system that magnet valve is controlled starts to remain unchanged, stop increasing accounting for of pwm control signal
Empty ratio；
Step 3, the low level that regulates as n-th of low level of described pwm control signal of increasing using voltage-regulation step pitch Δ VJudge the dutycycle that described n-th regulatesWhether 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 described n-th regulation；When the magnetic valve that described high-speed switch electromagnetic valve is controlled
When the pressure of hydraulic test bench system starts to remain unchanged, stop increasing the dutycycle of pwm control signal；Mark n-th is adjusted
The low level of the pwm control signal of jointFor Vmax；Otherwise, n+1 is assigned to n, and repeated execution of steps 3；
Step 4, using voltage-regulation step pitch Δ V reduce described pwm control signal low level as (n+1)th time regulation low electricity
FlatJudge the dutycycle that described n-th regulatesWhether it is " 0 "；" if 0 ", then n+1 is assigned to n, and
Repeated execution of steps 4；Otherwise, the PWM control letter of described (n+1)th regulation is incrementally increased according to duty cycle adjustment step pitch Δ λ
Number dutycycle；When the pressure of the magnetic valve hydraulic test bench system that described high-speed switch electromagnetic valve is controlled starts to remain unchanged,
Stop increasing the dutycycle of pwm control signal；Mark the low level of the pwm control signal of (n+1)th regulationFor Vmin；
Step 5, set described ratio low level VPLSpan be [Vmin,Vmax)。
Compared with the prior art, beneficial effects of the present invention is embodied in:
1, the present invention improves the proportionality of high-speed switch electromagnetic valve by adjusting the frequency in pwm control signal parameter,
The frequency adoption rate frequency of pwm control signal, reduces the Oscillation Amplitude that high-speed switch electromagnetic valve spool suspends, improves valve
The ratio control accuracy of mouth aperture.
2, the present invention improves speed-sensitive switch electricity by adjusting the voltage high level in pwm control signal parameter and voltage low level
The proportionality of magnet valve, the voltage high level adoption rate high level of pwm control signal, voltage low level adoption rate low level,
Widen the ratio control range of high-speed switch electromagnetic valve and effectively controlled duty cycle range, having improve high-speed switch electromagnetic valve and controlled
The flow of system and the ratio control range of pressure, it is achieved that the regulation finer to valve port opening and more accurate to flow and pressure
Regulation, the ratio that improve high-speed switch electromagnetic valve on the whole controls function.
3, the present invention is achieved high-speed switch electromagnetic valve ratio control range by the parameter adjusting pwm control signal and effectively
Control widening of duty cycle range, improve the proportionality of high-speed switch electromagnetic valve, it is not necessary to change the knot of high-speed switch electromagnetic valve
Structure design parameter, workable, and it is suitable for the dissimilar and high-speed switch electromagnetic valve of parameter, applied widely.
4, the present invention widens at a high speed by adjusting frequency, voltage high level and voltage low level in pwm control signal parameter
Switch electromagnetic valve ratio control range and effectively control duty cycle range, is proportionality the simplest improving high-speed switch electromagnetic valve
Prompt effective ways, effectively prevent the ratio being improved high-speed switch electromagnetic valve by the intelligent power drive circuit of design magnetic valve
Characteristic, reduces the hardware driving circuit cost of high-speed switch electromagnetic valve, and engineering application is higher.
Accompanying drawing explanation
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 generator；3 solenoid valve interfaces；4 pressure sensors；5 computers.
Detailed description of the invention
In the present embodiment, a kind of PWM control method improving high-speed switch electromagnetic valve proportionality, at high-speed switch electromagnetic valve
When using as ratio control function, the frequency of the pwm control signal of high-speed switch electromagnetic valve, high level and low level are set
What parameter widened the proportion adjustment scope of high-speed switch electromagnetic valve and PWM effectively controls duty cycle range, reduces speed-sensitive switch
The pressure fluctuations amplitude of magnetic valve, improves the proportionality of high-speed switch electromagnetic valve.Specifically,
Refering to Fig. 1, a kind of PWM control method improving high-speed switch electromagnetic valve proportionality, make at high-speed switch electromagnetic valve
When controlling function use for ratio, the frequency of the pwm control signal arranging high-speed switch electromagnetic valve is proportional frequency fP, arrange
The high level of the pwm control signal of high-speed switch electromagnetic valve is ratio high level VPH, the PWM of high-speed switch electromagnetic valve is set
The low level of control 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 less than
Or during much smaller than critical frequency, high-speed switch electromagnetic valve easily occurs periodically opening and closing dynamic characteristic, high-speed switch electromagnetic valve
Being difficult under effect of inertia maintain full-gear, be unfavorable for that the ratio of high-speed switch electromagnetic valve controls the realization of function, increase is driven
Dynamic frequency, the ratio control range of high-speed switch electromagnetic valve and the effectively change of control duty cycle range are small, but spool vibrations width
Degree reduces, and the beneficially ratio of valve port opening controls and accurately regulation.For ensureing that the ratio of high-speed switch valve valve port opening controls merit
Can, the driving frequency of pwm control signal should be greater than the critical frequency of high-speed switch electromagnetic valve.Owing to high-speed switch electromagnetic valve has
Certain operating frequency range, in being embodied as, chooses the proportional frequency f of pwm control signalPExist for high-speed switch electromagnetic valve
Maximum frequency values 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 high speed
The normal voltage of switch electromagnetic valve place system, the high-speed switch electromagnetic valve used on automobile is generally direct current 12V voltage and drives,
Engineering truck and commercial car are generally direct current 24V voltage and drive, the ratio high level V of pwm control signal in the present inventionPHAdopt
Normal voltage by high-speed switch electromagnetic valve place system, it is not necessary to produce high pressure by booster circuit, can effectively reduce speed-sensitive switch
The cost of solenoid hardware drive circuit.
Ratio low level V of pwm control signalPLIt is to determine its span by pressure proportional regulation test method.
Owing to high-speed switch electromagnetic valve exists coil inductance L, can not promote rapidly at coil electricity initial stage coil current, and armature
And spool is at initial position, armature working gas gap is maximum, by improving the low level voltage of pwm control signal, increases coil
Electric current and electromagnetic force, but the electromagnetic force produced also is not enough to overcome the unlatching resistance of the magnetic valves such as return spring force, spool displacement are
Zero, the aperture of magnetic valve is zero, but owing to preset electromagnetic force part overcomes back-moving spring etc. to open resistance, when at a high speed
When switch electromagnetic valve carries out opening operation, only need the dutycycle of the least pwm control signal can complete high-speed switch electromagnetic valve
Breakdown action, effectively reduce the unlatching dutycycle of pwm control signal.Thereby through choosing rational pwm control signal
Low level voltage, can effectively reduce the unlatching dutycycle of high-speed switch electromagnetic valve, and the effectively control widening pwm control signal accounts for
Sky compares scope.
In being embodied as, pressure proportional regulation test method is to carry out as follows:
Step 1, high-speed switch electromagnetic valve is accessed magnetic valve hydraulic test bench system, owing to high-speed switch electromagnetic valve is just operated in
Time often in operating frequency range, the frequency of pwm control signal is the biggest, and the amplitude of spool vibrations is the least, is more beneficial to valve port opening
Ratio controls and accurately regulation, and the frequency arranging pwm control signal is proportional frequency fP, i.e. high-speed switch electromagnetic valve is normally
Maximum frequency values in operating frequency range, to improve the ratio control accuracy of high-speed switch electromagnetic valve, arranges PWM and controls letter
Number high level be ratio high level VPH, i.e. the rated operational voltage of high-speed switch electromagnetic valve, the accessed system of high-speed switch electromagnetic valve
The normal voltage of system typically can meet requirement, and vehicle high-speed switch electromagnetic valve is generally direct current 12V or 24V, vehicle power
Standard mains voltage can meet voltage supply requirement, in order to ensure by pressure proportional regulation test method determine PWM control
Ratio low level V of signalPLThe ease for operation of process, arranges low level V of pwm control signalLFor 0V, and according to necessarily
Voltage-regulation step pitch increase low level VL, to avoid low level V due to pwm control signalLToo high and voltage-regulation is set
Step pitch arranges excessive and loses ratio low level V of pwm control signalPLData, improve the standard of pressure proportional regulation test method
Really rate；
Step 2, definition duty cycle adjustment step pitch are Δ λ, voltage-regulation step pitch is Δ V, low level VLRegulation number of times be n,
And initializing Δ λ=α, Δ V=β, n=1, the initialization value of Δ λ and Δ V is true according to the design parameter of high-speed switch electromagnetic valve
Fixed；
Step 3, with low level V of pwm control signalLFor 0V as (n-1)th time regulation low levelPWM is set
The dutycycle of control signal is 0, incrementally increases the pwm control signal of (n-1)th regulation according to duty cycle adjustment step pitch Δ λ
Dutycycle, and record the consequent pressure change situation of the magnetic valve hydraulic test bench system that high-speed switch electromagnetic valve is controlled, work as height
When the pressure of the magnetic valve hydraulic test bench system that speed switch electromagnetic valve is controlled starts to increase, pressure when marking (n-1)th regulation
Starting to increase the pressure in moment isWhen marking (n-1)th regulation, pressure starts to increase the PWM corresponding to the moment and controls letter
Number dutycycle beAnd continue to incrementally increase the pwm control signal of (n-1)th regulation according to duty cycle adjustment step pitch Δ λ
Dutycycle；When the pressure of the magnetic valve hydraulic test bench system that high-speed switch electromagnetic valve is controlled starts to remain unchanged, mark
During (n-1)th regulation, pressure start the to remain unchanged pressure in moment isWhen marking (n-1)th regulation, pressure starts to maintain not
Become the dutycycle of pwm control signal corresponding to the moment intoAnd stop increasing the dutycycle of pwm control signal；
Step 3, the low level that regulates as n-th of low level of pwm control signal of increasing using voltage-regulation step pitch Δ V
Judge the dutycycle that n-th regulatesWhether it is " 0 "；" if 0 ", then mark sky ratioFor the pressure corresponding to " 0 " moment
Power isDue to the low level voltage of the preset pwm control signal being not zero, so that the coil current produced and electromagnetic force
Also be enough to overcome the magnetic valve such as electromagnetism and return spring force to open resistance in the case of the dutycycle of pwm control signal is zero,
But also reduce the proportion adjustment scope of high-speed switch electromagnetic valve, need to further determine that the low electricity of suitable pwm control signal
Ordinary telegram pressure, to ensure that the electromagnetic force produced when the dutycycle of pwm control signal is zero is not enough to overcome electromagnetism and back-moving spring
Resistance opened by the magnetic valves such as power, but only needs the dutycycle of the least pwm control signal just can meet and overcome magnetic valve to open resistance
Needs, to expand the effective duty cycle scope of pwm control signal；Continue to incrementally increase the according to duty cycle adjustment step pitch Δ λ
The dutycycle of the pwm control signal of n regulation；The magnetic valve hydraulic test bench system controlled when high-speed switch electromagnetic valve
When pressure starts to remain unchanged, during mark n-th regulation, pressure start the to remain unchanged pressure in moment isMark n-th is adjusted
During joint, pressure start the to remain unchanged dutycycle of the pwm control signal corresponding to the moment isAnd stop increasing PWM control
The dutycycle of signal；The low level of the pwm control signal of mark n-th regulationFor Vmax；Otherwise, n+1 is assigned to n,
And repeated execution of steps 3；
Step 4, using voltage-regulation step pitch Δ V reduce pwm control signal low level as (n+1)th time regulation low levelJudge the dutycycle regulated (n+1)th timeWhether it is " 0 "；" if 0 ", then n+1 is assigned to n, and repeats
Perform step 4；Otherwise, mark pressure starts to increase the pressure in moment and isOwing to the preset PWM being not zero controls
Coil current that signal low level voltage produces and electromagnetic force are not enough to gram in the case of the dutycycle of pwm control signal is zero
Take the magnetic valve such as electromagnetism and return spring force and open resistance, but the preset electromagnetic force part owing to producing overcomes electromagnetism and reset
Resistance opened by springs etc., when high-speed switch electromagnetic valve carries out opening operation, only needs the duty of the least pwm control signal
Ratio can complete the breakdown action of high-speed switch electromagnetic valve, has expanded the effective duty cycle scope of pwm control signal；Continuation is pressed
The dutycycle of the pwm control signal of (n+1)th regulation is incrementally increased according to duty cycle adjustment step pitch Δ λ；Work as high-speed switch electromagnetic valve
When the pressure of the magnetic valve hydraulic test bench system controlled starts to remain unchanged, when marking (n+1)th regulation, pressure starts to maintain
The pressure in constant moment isThe PWM that when marking (n+1)th regulation, pressure starts to remain unchanged corresponding to the moment controls letter
Number dutycycle beAnd stop increasing the dutycycle of pwm control signal；The PWM marking (n+1)th regulation controls
The low level of signalFor Vmin；
Step 5, setting ratio low level VPLSpan be [Vmin,Vmax)。
Embodiment:
The present embodiment uses the control method of the present invention that certain model high-speed switch electromagnetic valve carries out ratio and drives control, and this model is high
The parameter of speed switch electromagnetic valve is as follows: operating frequency range is 200HZ～1KHZ, and rated operational voltage is 12V, coil turn
Being 526 circles, a diameter of 9mm of moving armature, initial air gap is 2.2mm, and non-working-gap is 0.2mm.Spool maximum displacement is
1.0mm, moving-mass is 0.0045kg, and coil resistance is 6 ohm, and spring pre compressed magnitude is 2.0mm, and spring rate is
1300N·m-1, viscous damping coefficient is 1.4N m s-1, hydraulic power coefficient is 0.005 × 2E6N m-1, vacuum magnetic conductance
Rate is 4 π E-7H m-1, opacity is 0.5mm.
Magnetic valve hydraulic test system as shown in Figure 2, wherein 1 is hydraulic pump, is used for producing hydraulic pressure, and 2 believe for PWM
Number generator, for producing the pwm control signal of different frequency, high level, low level and dutycycle, 3 is solenoid valve interface,
For accessing high-speed switch electromagnetic valve, 4 is pressure sensor, and for detecting the pressure of hydraulic system, 5 is computer, is used for remembering
The pressure change procedure of record pressure sensor, connects the magnetic valve that this high-speed switch electromagnetic valve accesses in magnetic valve hydraulic test system
Mouth 2, arranges hydraulic pump and produces the hydraulic pressure of 2Mpa.
First test high-speed switch electromagnetic valve proportionality under conventional pwm control signal parameter, for ensureing speed-sensitive switch electricity
The ratio function of magnet valve, there is the critical frequency of work, this reality in the frequency of pwm control signal significantly larger than high-speed switch electromagnetic valve
The critical frequency executing the high-speed switch electromagnetic valve used in example is 200HZ, takes the frequency of pwm control signal to be respectively
500HZ, 800HZ and 1KHZ, high level is direct current 12V, and low level is the ratio control that 0V carries out high-speed switch electromagnetic valve,
Computer 5 records the pressure changing of high-speed switch electromagnetic valve, it is known that the frequency of pwm control signal is to speed-sensitive switch electromagnetism
The proportion adjustment scope of valve, the effective of pwm signal control duty cycle range substantially without impact, but along with pwm control signal
Frequency is the biggest, and the pressure amplitude of high-speed switch electromagnetic valve reduces, and the beneficially ratio of high-speed switch electromagnetic valve is fine-tuned, no
It is 0.32Mpa～1.98Mpa with the pressure proportional control range of the high-speed switch electromagnetic valve under pwm frequency signal, PWM
The duty cycle range that effectively controls of signal is 72%～91%.
Method to set up below as the pwm control signal of the present invention carries out high-speed switch electromagnetic valve ratio Control experiment.
From above-mentioned high-speed switch electromagnetic valve proportionality experimental test result under conventional pwm control signal parameter,
The frequency of pwm control signal to the proportion adjustment scope of high-speed switch electromagnetic valve, pwm signal effectively control duty cycle range
Substantially without impact, but along with the frequency of pwm control signal increases, the pressure amplitude of high-speed switch electromagnetic valve reduces, profit
Ratio in high-speed switch electromagnetic valve is fine-tuned, thus chooses the proportional frequency of the pwm control signal of high-speed switch electromagnetic valve
fPFor high-speed switch electromagnetic valve maximum frequency values in normal operating frequency range, it may be assumed that 1KHZ；Speed-sensitive switch electromagnetism is set
The ratio high level V of the pwm control signal of valvePHRated operational voltage for high-speed switch electromagnetic valve, it may be assumed that direct current 12V；On
State the proportional frequency f of pwm control signalPWith ratio high level VPHProduced by PWM signal generator 2.
Ratio low level V of pwm control signalPLSpan by pressure proportional regulation test method determine, concrete steps
As follows:
Step 1, high-speed switch electromagnetic valve accessing magnetic valve hydraulic test bench system, the frequency arranging pwm control signal is
Proportional frequency fP=1KHZ, the high level arranging pwm control signal is ratio high level VPH=12V, for avoiding due to PWM
Low level V of control signalLArrange too high and voltage-regulation step pitch to arrange excessive and lose the ratio low level of pwm control signal
VPLData, improve the accuracy rate of pressure proportional regulation test method, arrange low level V of pwm control signalLFor 0V, and
Low level V is increased according to certain voltage-regulation step pitchL；
Step 2, definition duty cycle adjustment step pitch are Δ λ, voltage-regulation step pitch is Δ V, low level VLRegulation number of times be n,
The initialization value of Δ λ and Δ V determines according to the design parameter of high-speed switch electromagnetic valve, choose in the present embodiment Δ λ=α=1%,
Δ V=β=0.1V, chooses initialization regulation frequency n=1；
Step 3, the low level of pwm control signal of the 0th regulation is setAccounting for of pwm control signal is set
Empty ratio is 0, incrementally increases the dutycycle of the pwm control signal of the 0th regulation, and record according to duty cycle adjustment step pitch 1%
The consequent pressure change situation of the magnetic valve hydraulic test bench system that high-speed switch electromagnetic valve is controlled, when high-speed switch electromagnetic valve institute
When the pressure of the magnetic valve hydraulic test bench system controlled starts to increase, when marking the 0th regulation, pressure starts to increase the pressure in moment
Power isWhen marking the 0th regulation, pressure starts to increase the dutycycle of the pwm control signal corresponding to the moment
ForAnd continue to incrementally increase the dutycycle of the pwm control signal of the 0th regulation according to duty cycle adjustment step pitch 1%；
When the pressure of the magnetic valve hydraulic test bench system that high-speed switch electromagnetic valve is controlled starts to remain unchanged, mark the 0th regulation
Time pressure start the to remain unchanged pressure in moment beWhen marking the 0th regulation, pressure starts the moment that remains unchanged
The dutycycle of corresponding pwm control signal isAnd stop increasing the dutycycle of pwm control signal；Thus
Understand high-speed switch electromagnetic valve at the 0th the regulation low level result of the test of pwm control signal and above-mentioned high-speed switch electromagnetic valve
Proportionality experimental test result under conventional pwm control signal parameter is basically identical, the pressure ratio of high-speed switch electromagnetic valve
Example control range is 0.31Mpa～1.99Mpa, and the duty cycle range that effectively controls of pwm signal is 72%～91%.
Step 3, the low level of pwm control signal of the 1st regulation is setFor voltage-regulation step pitch 0.1V, according to step
The experimental working technique of rapid 2, marks the dutycycle of the 1st regulationDutycycle due to the 1st regulation
It is not " 0 " to be then assigned to n, and repeated execution of steps 3 by 2；Above-mentioned test operation is repeated, adjusts when carrying out the 89th time
The low level of the pwm control signal of jointTime, the dutycycle marking the 89th regulation isDue to
Then mark sky ratioFor the pressure corresponding to " 0 " momentLow level due to preset pwm control signal
For 8.9V, so that its coil current produced and electromagnetic force also be enough to gram in the case of the dutycycle of pwm control signal is zero
Take the magnetic valve such as electromagnetism and return spring force and open resistance, complete to open；Continue to incrementally increase the according to duty cycle adjustment step pitch 1%
The dutycycle of the pwm control signal of 89 regulations；The magnetic valve hydraulic test bench system controlled when high-speed switch electromagnetic valve
When pressure starts to remain unchanged, when marking the 89th regulation, pressure start the to remain unchanged pressure in moment isMark
Remember that start the to remain unchanged dutycycle of the pwm control signal corresponding to the moment of pressure when regulating is the 89th timeAnd stop
Only increase the dutycycle of pwm control signal；Mark the low level of the pwm control signal of the 89th regulationFor
Vmax=8.9V；
Step 4, the low level of pwm control signal of the 90th regulation is setFor reducing with voltage-regulation step pitch 0.1V
The low level of pwm control signal, i.e.The dutycycle marking the 90th regulation isDue toNo
For " 0 ", then mark pressure starts to increase the pressure in momentOwing to preset pwm control signal low level is
Coil current that 8.8V produces and electromagnetic force are not enough to overcome electromagnetism and multiple in the case of the dutycycle of pwm control signal is zero
Resistance opened by the magnetic valves such as position spring force, but the preset electromagnetic force part owing to producing overcomes electromagnetism and back-moving spring etc. to open
Resistance, when high-speed switch electromagnetic valve carries out opening operation, can complete when the dutycycle of pwm control signal is 1% at a high speed
The breakdown action of switch electromagnetic valve, has expanded the effective duty cycle scope of pwm control signal；Continue to walk according to duty cycle adjustment
Dutycycle away from 1% pwm control signal incrementally increasing the 90th regulation；When the magnetic valve that high-speed switch electromagnetic valve is controlled
When the pressure of hydraulic test bench system starts to remain unchanged, when marking the 90th regulation, pressure starts to remain unchanged the pressure in momentWhen marking the 90th regulation, pressure starts to remain unchanged the dutycycle of the pwm control signal corresponding to the momentAnd stop increasing the dutycycle of pwm control signal；Mark the low electricity of the pwm control signal of the 90th regulation
Flat
Step 5, setting ratio low level VPLSpan be [Vmin,Vmax)=[8.8V, 8.9V).
In the present embodiment, choose ratio low level V of pwm control signalPL=8.8V, then high-speed switch electromagnetic valve is at PWM
The proportional frequency f of control signalP=1KHZ, ratio high level VPH=12V, ratio low level VPL=8.8V isoparametric ratio control
Under system, the pressure proportional control range of high-speed switch electromagnetic valve is 0.11Mpa～2.0Mpa, pwm signal effectively control duty
Being 1%～66% than scope, high-speed switch electromagnetic valve in conventional pwm control signal parameter downforce ratio control range is
0.32Mpa～1.98Mpa, the duty cycle range that effectively controls of pwm signal is 72%～91%, uses PWM of the present invention to control
The pressure proportional control range of the high-speed switch electromagnetic valve under method and effective duty cycle scope have all obtained significantly widening, and
The frequency of pwm control signal is the biggest, and the pressure amplitude of high-speed switch electromagnetic valve reduces, the beneficially ratio of high-speed switch electromagnetic valve
Example is fine-tuned.
The PWM control method using the present invention can effectively optimize the proportionality of high-speed switch electromagnetic valve, reduces and opens at a high speed
The ratio closing the pressure fluctuations amplitude of magnetic valve, beneficially high-speed switch electromagnetic valve controls and is fine-tuned, and has widened speed-sensitive switch electricity
The proportion adjustment scope of magnet valve and PWM effectively control duty cycle range.
Claims (3)
1. the PWM control method improving high-speed switch electromagnetic valve proportionality, it is characterised in that: open in described high speed
Close magnetic valve as ratio control function uses time, arrange described high-speed switch electromagnetic valve pwm control signal frequency be than
Example frequency fP, the high level of the pwm control signal arranging described high-speed switch electromagnetic valve is ratio high level VPH, institute is set
The low level of the pwm control signal stating high-speed switch electromagnetic valve is ratio low level VPL。
PWM control method the most according to claim 1, it is characterised in that:
Described proportional frequency fPFor described high-speed switch electromagnetic valve maximum frequency values in normal operating frequency range；
Described ratio high level VPHRated operational voltage for described high-speed switch electromagnetic valve；
Described ratio low level VPLIt is to determine its span by pressure proportional regulation test method.
Control method the most according to claim 2, it is characterised in that: described pressure proportional regulation test method is by such as
Lower step is carried out:
Step 1, by described high-speed switch electromagnetic valve access magnetic valve hydraulic test bench system, described pwm control signal is set
Frequency be described proportional frequency fP, the high level arranging described pwm control signal is described ratio high level VPH, arrange
Low level V of described pwm control signalLFor 0V；
Step 2, definition duty cycle adjustment step pitch are Δ λ, voltage-regulation step pitch is Δ V, described low level VLRegulation number of times be
N, and initialize Δ λ=α, Δ V=β, n=1；
Step 3, with low level V of described pwm control signalLFor 0V as (n-1)th time regulation low levelIf
The dutycycle putting pwm control signal is 0, incrementally increases the PWM of described (n-1)th regulation according to duty cycle adjustment step pitch Δ λ
The dutycycle of control signal, and record the relevant pressure of the magnetic valve hydraulic test bench system that described high-speed switch electromagnetic valve is controlled
Situation of change, when the pressure of the magnetic valve hydraulic test bench system that described high-speed switch electromagnetic valve is controlled starts to increase, mark
During (n-1)th regulation, pressure starts to increase the dutycycle of the pwm control signal corresponding to the moment and isAnd continue according to accounting for
The dutycycle of the empty pwm control signal incrementally increasing described (n-1)th regulation than regulation step pitch Δ λ；When described speed-sensitive switch electricity
When the pressure of the magnetic valve hydraulic test bench system that magnet valve is controlled starts to remain unchanged, stop increasing accounting for of pwm control signal
Empty ratio；
Step 3, the low level that regulates as n-th of low level of described pwm control signal of increasing using voltage-regulation step pitch Δ VJudge the dutycycle that described n-th regulatesWhether 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 described n-th regulation；When the magnetic valve that described high-speed switch electromagnetic valve is controlled
When the pressure of hydraulic test bench system starts to remain unchanged, stop increasing the dutycycle of pwm control signal；Mark n-th is adjusted
The low level of the pwm control signal of jointFor Vmax；Otherwise, n+1 is assigned to n, and repeated execution of steps 3；
Step 4, using voltage-regulation step pitch Δ V reduce described pwm control signal low level as (n+1)th time regulation low electricity
FlatJudge the dutycycle that described n-th regulatesWhether it is " 0 "；" if 0 ", then n+1 is assigned to n, and
Repeated execution of steps 4；Otherwise, the PWM control letter of described (n+1)th regulation is incrementally increased according to duty cycle adjustment step pitch Δ λ
Number dutycycle；When the pressure of the magnetic valve hydraulic test bench system that described high-speed switch electromagnetic valve is controlled starts to remain unchanged,
Stop increasing the dutycycle of pwm control signal；Mark the low level of the pwm control signal of (n+1)th regulationFor Vmin；
Step 5, set described ratio low level VPLSpan be [Vmin,Vmax)。
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| CN110094565A (en) * | 2019-05-08 | 2019-08-06 | 合肥工业大学 | A kind of control method for reducing high-speed switch electromagnetic valve and closing time delay |
| CN110865225A (en) * | 2019-12-02 | 2020-03-06 | 合肥工业大学 | Proportional valve current acquisition method and system and electronic equipment |
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| CN114036684A (en) * | 2021-11-19 | 2022-02-11 | 吉林大学 | Parameter adjusting method of high-speed switch valve |
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