CN104344055B - Proportional electromagnetic valve driving method and system based on PWM (Pulse Width Modulation) - Google Patents
Proportional electromagnetic valve driving method and system based on PWM (Pulse Width Modulation) Download PDFInfo
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- CN104344055B CN104344055B CN201410473388.7A CN201410473388A CN104344055B CN 104344055 B CN104344055 B CN 104344055B CN 201410473388 A CN201410473388 A CN 201410473388A CN 104344055 B CN104344055 B CN 104344055B
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- frequency values
- dutycycle
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- proportional solenoid
- corresponding frequency
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Classifications
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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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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The invention discloses a proportional electromagnetic valve driving method and system based on PWM. The method comprises the following steps: presetting the corresponding relation of duty cycles and frequency values, wherein the distribution rule of the frequency values in the corresponding relation is that the frequency value corresponding to a middle duty cycle is larger than the frequency values corresponding to the duty cycles on the two sides; according to the corresponding relation, determining the frequency value corresponding to a target duty cycle; according to the target duty cycle and the frequency value corresponding to the target duty cycle, generating a PWM driving signal, and driving a proportional electromagnetic valve by using the PWM driving signal. The method can enable the electromagnetic valve to output stable secondary pressure, the power loss of the electromagnetic valve is lower, and the slight flutter of the valve element of the electromagnetic valve is retained, so that the valve element is prevented from being clamped.
Description
Technical field
The present invention relates to proportional solenoid drives field, particularly to a kind of proportional solenoid driving method based on PWM
And system.
Background technology
The ideal drive signal of proportional solenoid is the unidirectional current being loaded with small size tremor.But for system complexity
With the consideration of cost, the embedded control system of the engineering machinery such as excavator is generally using pulse width modulation (Pulse Width
Modulation, PWM) method driving proportional solenoid, PWM comprises dutycycle and two kinds of information of frequency：Adjustment dutycycle
Required voltage value can be obtained；And the stability of comparative selection example electromagnetic valve secondary pressure of PWM frequency and oneself power consumption have very
Big impact.
The PWM mostly adopting fixed frequency at present drives proportional solenoid, and it suffers from the drawback that：
1) PWM frequency of driving proportional solenoid is too low can cause proportional solenoid secondary pressure to fluctuate with pwm pulse；
2) drive the too high response time that will reduce electromagnetic valve of PWM signal frequency of proportional solenoid, and can produce
Many power losses, increase magnetic hystersis loss and the eddy-current loss of electromagnetic valve.
Content of the invention
In view of this, the present invention proposes a kind of proportional solenoid driving method based on PWM and the ratio electromagnetism based on PWM
Valve drive system, is changed with PWM duty cycle with realizing frequency, and then stablizes proportional solenoid secondary pressure, prevents valve element clamping stagnation
With reduction power consumption.
On the one hand, the invention provides a kind of proportional solenoid driving method based on PWM, including：Pre-set duty
The corresponding relation with frequency values for the ratio, the regularity of distribution of described corresponding relation medium frequency value is that the middle corresponding frequency values of dutycycle are big
In the corresponding frequency values of both sides dutycycle；Determine target duty than corresponding frequency values according to described corresponding relation；According to described
Target duty ratio and its corresponding frequency values, generate PWM drive signal, and drive ratio electricity using described PWM drive signal
Magnet valve.
Further, the step of described " determining target duty than corresponding frequency values according to described corresponding relation " includes：
First linear interpolation calculating is carried out according to described corresponding relation；Then determine that described target accounts for according to the result that linear interpolation calculates
Sky is than corresponding frequency values.
Further, the step of described " pre-setting the corresponding relation of dutycycle and frequency values " includes：Pre-set and account for
Empty ratio is corresponding frequency values when 10%, 50% and 90%, and wherein dutycycle 50% is middle dutycycle, and dutycycle 50% is corresponding
Frequency values maximum, dutycycle is 10% and 90% to be respectively minimum duty cycle and maximum duty cycle, dutycycle be 10% and/or
90% corresponding frequency values are minimum.
Further, described dutycycle is that when 10% and 90%, corresponding frequency values are identical.
Further, described also included based on the proportional solenoid driving method of PWM：In real time in sensing proportional solenoid
Hydraulic oil oil temperature；Also wrap after the step of described " determining target duty than corresponding frequency values according to described corresponding relation "
Include：According to the method for adjustment of the change with described hydraulic oil oil temperature for the default frequency values, adjust described target duty than corresponding
Frequency values；Described frequency includes with the method for adjustment that oil temperature changes：Raise with described hydraulic oil oil temperature, increase described frequency values.
On the other hand, the invention provides a kind of proportional solenoid drive system based on PWM, including：Corresponding relation sets
Put unit, for pre-setting the corresponding relation of dutycycle and frequency values, the regularity of distribution of described corresponding relation medium frequency value is
The corresponding frequency values of middle dutycycle are more than the corresponding frequency values of both sides dutycycle；Frequency determinative elements, for according to described right
Determination target duty should be related to than corresponding frequency values；Driving signal generating unit, for according to described target duty ratio and its
Corresponding frequency values, generate PWM drive signal；Driver element, for driving proportional solenoid using described PWM drive signal.
Further, described frequency determinative elements include：Computation subunit, for carrying out linearly according to described corresponding relation
Interpolation calculation；Determination subelement, the result for being calculated according to linear interpolation determines described target duty than corresponding frequency values.
Further, described correspondence setting unit includes storing sub-units, be used for pre-setting dutycycle be 10%,
Corresponding frequency values when 50% and 90%, wherein dutycycle 50% are middle dutycycle, and the corresponding frequency values of dutycycle 50% are
Greatly, dutycycle is respectively minimum duty cycle and maximum duty cycle for 10% and 90%, and dutycycle is corresponding for 10% and/or 90%
Frequency values are minimum.
Further, described also included based on the proportional solenoid drive system of PWM：Sensing unit, feels for real-time
Survey the hydraulic oil oil temperature in proportional solenoid；Adjustment unit, for according to default frequency values with described hydraulic oil oil temperature change
The method of adjustment changed, adjusts described target duty than corresponding frequency values；Described frequency includes with the method for adjustment that oil temperature changes：
Raise with described hydraulic oil oil temperature, increase described frequency values
Further, described it is arranged in dsp chip or universal cpu based on the proportional solenoid drive system of PWM.
The proportional solenoid driving method based on PWM for the present invention and system pass through duty according to needed for proportional solenoid valve control
The difference of ratio adopts different PWM frequency, specifically in both sides dutycycle, using relatively low PWM frequency, and in middle dutycycle
Using higher frequency, realize making proportional solenoid reach that output pressure is stable, prevent valve element clamping stagnation and reduce power consumption.
Brief description
The accompanying drawing constituting the part of the present invention is used for providing a further understanding of the present invention, the schematic reality of the present invention
Apply example and its illustrate, for explaining the present invention, not constituting inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the present invention based on different duty condition lower coil electricity in the proportional solenoid driving method embodiment of PWM
Stream fluctuation size dI and current value I variation diagram；
Fig. 2 flow chart that the proportional solenoid driving method embodiment based on PWM provides for the present invention；
Fig. 3 another flow chart that the proportional solenoid driving method embodiment based on PWM provides for the present invention；
Fig. 4 structured flowchart that the proportional solenoid drive system based on PWM provides for second embodiment of the invention.
Specific embodiment
It should be noted that in the case of not conflicting, the embodiment in the present invention and the feature in embodiment can phases
Mutually combine.To describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
The theoretical foundation of the application is：In view of proportion electro-magnet belongs to excitation-type electromechanical converter part, embedded Control
The control electric current that device produces produces magnetic flux in proportion electro-magnet coil, promotes armature displacement, and the electromagnetic force that valve element is subject to has
With current fluctuation identical frequency.The mechanical electrical and hydraulic system considering proportional solenoid understands, its mechanical system part transmits letter
Number can be used as Low-pass second order filter, and electrical system transfers function can be used as low pass first-order filtering.Ratio electromagnetism is driven using PWM
During valve, steady-state current I in coil and current fluctuation dI depends on timeconstantτ and PWM frequency 1/T and the dutycycle of coil
D.Can be derived shown in steady-state current I and current fluctuation dI size such as formula (1) according to transient current.
Wherein A=e-DT/τ, B=e-(1-D)T/τ, U is voltage, and R is resistance；Steady-state current I is in the controls as driving
To control electromagnetic valve secondary pressure, current fluctuation dI can prevent valve element card with the low amplitude vibrations of holding armature itself to electric current
Stagnant phenomenon.
Inventor calculates according to formula (1) and finds, under the conditions of different duty, coil current fluctuation size dI and current value I become
Change as shown in figure 1, left side coordinate is the variation relation with dutycycle D for current fluctuation size dI in Fig. 1, right side coordinate is that electric current is big
Little I is with the variation relation of dutycycle D.According to Fig. 1 it is found that under the PWM frequency of a certain fixation electromagnetic valve output secondary
Pressure fluctuation when dutycycle is 50% is the most violent, and is secondary pressure output wave in the case of 10% and 90% in dutycycle
Dynamic less, and PWM frequency is higher, electric current output is closer to linear relationship with dutycycle.Additionally, electromagnetic valve when the temperature is low
Secondary pressure fluctuation range relatively small, relatively stable；And when temperature is higher, the secondary pressure of electromagnetic valve output fluctuates relatively
Greatly, by increasing PWM frequency, the secondary pressure fluctuation of electromagnetic valve output is corresponding to be reduced.
Based on above-mentioned discovery, inventors herein propose one kind according to different duty, change the controlling party of PWM signal frequency
Method：In order to reduce the power loss of electromagnetic valve, at two ends dutycycle (when near as 10% and 90%), PWM output is using relatively low
PWM frequency, and in middle dutycycle (as when near 50%), PWM output is corresponded to using higher frequency, other dutycycles
Frequency values then pass through to pre-set or the method such as linear interpolation obtains.Additionally, PWM frequency is generated for the first time according to dutycycle except above-mentioned
Outside rate, the embodiment of the present invention further contemplates the impact of ambient temperature, when the temperature increases, PWM frequency is adjusted, and correspondence is relatively low
Adopt higher PWM frequency during temperature, generate a new PWM frequency, to obtain more stable secondary pressure.Below in conjunction with accompanying drawing
Illustrate.
Embodiment of the method
Fig. 2 and Fig. 3 is the flow chart of the proportional solenoid driving method based on PWM provided in an embodiment of the present invention；As Fig. 2
Shown, a kind of proportional solenoid driving method based on PWM, including：
Step 11：Pre-set the corresponding relation of dutycycle and frequency values, the regularity of distribution of corresponding relation medium frequency value is
The corresponding frequency values of middle dutycycle are more than the corresponding frequency values of both sides dutycycle.
Specifically, can pre-set dutycycle is corresponding frequency values, wherein dutycycle when 10%, 50% and 90%
50% is middle dutycycle, and the corresponding frequency values of dutycycle 50% are maximum, and dutycycle is 10% and 90% respectively minimum duty
When maximum duty cycle, dutycycle is that 10% and/or 90% corresponding frequency values are minimum；Between 10% to 50% and 50% to
Calculated using linear interpolation between 90%, obtain other dutycycle respective frequencies values；Certainly can also by dutycycle be 10% and
When 90% corresponding frequency values be set to identical；As needed, the corresponding frequency values of other dutycycles can also be set, and here is not
Limit.
Step 12：Determine target duty than corresponding frequency values according to corresponding relation.
In the corresponding relation that step 11 pre-sets, each dutycycle, can be directly according to set in advance close to consecutive hours
Corresponding relation determines target duty than corresponding frequency values；If in the corresponding relation that step 11 sets dutycycle as discrete or
When person is finite number, linear interpolation can be adopted to determine other corresponding frequencies of dutycycle based on the corresponding relation being set
Rate, if not when dutycycle is not 10%, 50% and 90%, carries out linear interpolation according to corresponding relation and calculates determination target duty
Than corresponding frequency values.
Step 13：After the hydraulic oil oil temperature in real-time sensing proportional solenoid, according to default frequency with hydraulic oil oil
The method of adjustment of the change of temperature, adjustment target duty, than corresponding frequency values, generates new target duty than corresponding frequency values；
Frequency values include with the method for adjustment that oil temperature changes：Raise with hydraulic oil oil temperature, increase frequency values.
Step 14：According to target duty ratio and its corresponding frequency values, generate PWM drive signal.
Step 15：Drive proportional solenoid using PWM drive signal.
It should be noted that above-mentioned steps 13 are preferred steps, by this step, the target duty generating can be compared
The frequency values answered are optimized adjustment, to obtain the frequency values of the proportional solenoid PWM drive signal under condition of different temperatures, temperature
Then frequency values are big for degree height, reduce the hydraulic oil viscosity change leading to because hydraulic fluid temperature height is different and then affect electromagnetic valve
The deficiency of response characteristic.
Inventor is tested based on the proportional solenoid driving method of PWM to above-mentioned, specific as follows：Using KPM-
The proportional solenoid of K3V electric control pump configuration is subjects；The pump power limitation control ratio electromagnetism of KPM company K3V half electric control pump
Valve internal resistance R be 17.5Ohm, coil inductance Le be 19.5mH, then timeconstantτ=the Le/R of this electromagnetic valve coil be
0.0011143s, digging machine voltage 24V；The frequency of oscillation of the proportional solenoid of KPM-K3V electric control pump configuration is 80Hz.Using second order
The Bode figure of low pass filter understands, frequency is more than to the current fluctuation of 80Hz, the mechanical system of electromagnetic valve will be suppressed.
And the frequency of electric current is higher, the inhibitory action of mechanical two-order oscillation system is stronger.The electrical system of electromagnetic valve is equivalent to single order
Low-pass filtering, by its time constant understand electrical system cut-off frequency be 897Hz, with respect to mechanical system its to PWM arteries and veins
The inhibitory action rushing fluctuation signal is less.Therefore using the filtering characteristic of mechanical system, pwm signal can be filtrated to get
Required stable driving current, but need to retain the small size current fluctuation needed for valve element itself tremor simultaneously.It is hereby achieved that
Proportional solenoid Frequency PWM under condition of different temperatures drives strategy, as shown in table 1.
In table 1, when current value is that maximum (i.e. largest duty cycle, such as 90%) (i.e. dutycycle is minimum, such as with minimum for 513mA
10%) during 0mA, the stable PWM of secondary pressure to be reached, frequency values are relatively low, and work as electric current and be in middle position 327mA (i.e. dutycycle
For intermediate value, such as 50%) when, need using higher frequency, consistent with the result of theory analysis.Additionally, during high 36 DEG C of temperature,
The stable PWM of secondary pressure to be reached, frequency values are higher.
Table 1 proportional solenoid PWM optimization frequency
The difference that the present embodiment passes through dutycycle according to needed for proportional solenoid valve control adopts different PWM frequency, specifically
Ground, in both sides dutycycle, using relatively low PWM frequency, and in middle dutycycle using higher frequency, is realized making ratio electromagnetism
Valve reaches output pressure to be stablized, prevents valve element clamping stagnation and reduce power consumption.
System embodiment
Fig. 4 is the structured flowchart of the proportional solenoid drive system based on PWM provided in an embodiment of the present invention；Fig. 2 and Fig. 3
The explanation of corresponding embodiment is applied to the present embodiment, as shown in figure 4, a kind of proportional solenoid drive system based on PWM
Including：Correspondence setting unit, for pre-setting the corresponding relation of dutycycle and frequency values, corresponding relation medium frequency value
The regularity of distribution is that the middle corresponding frequency values of dutycycle are more than the corresponding frequency values of both sides dutycycle；Frequency determinative elements, are used for
Determine target duty than corresponding frequency values according to corresponding relation；Driving signal generating unit, for according to target duty when
Its corresponding frequency values, generates PWM drive signal；Driver element, for driving proportional solenoid using PWM drive signal.
Specifically, frequency determinative elements can include：Computation subunit (not shown), for entering according to corresponding relation
Line interpolation calculation obtains the corresponding frequency values of other dutycycles；Determination subelement (not shown), for according to linear
The result of interpolation calculation determines target duty than corresponding frequency values.Correspondence setting unit can include storing sub-units
(not shown), being used for pre-setting dutycycle is corresponding frequency values, wherein dutycycle 50% when 10%, 50% and 90%
For middle dutycycle, the corresponding frequency values of dutycycle 50% are maximum, dutycycle be 10% and 90% be respectively minimum duty cycle and
Maximum duty cycle, dutycycle is that 10% and/or 90% corresponding frequency values are minimum.
The proportional solenoid drive system being preferably based on PWM can also include：Sensing unit, for real-time sensing ratio
Hydraulic oil oil temperature in example electromagnetic valve；Adjustment unit, for the adjustment side of the change with hydraulic oil oil temperature according to default frequency
Method, adjustment target duty is than corresponding frequency values；Frequency values include with the method for adjustment that oil temperature changes：With hydraulic oil oil temperature liter
Height, increases frequency values.Be can be implemented in by adjustment unit and during different hydraulic fluid temperature, adopt different control strategies, to meet
The requirement of variation of ambient temperature.
Above-mentioned can be arranged in dsp chip or universal cpu based on the proportional solenoid drive system of PWM.
The present embodiment can make the stable secondary pressure of electromagnetic valve output, electricity by using the PWM drive signal of Frequency
The power attenuation of magnet valve is relatively low and small size tremor that remain valve core of the electromagnetic valve is preventing valve element clamping stagnation.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement made etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of proportional solenoid driving method based on PWM is it is characterised in that include：
Pre-set the corresponding relation of dutycycle and frequency values, the regularity of distribution of described corresponding relation medium frequency value is middle duty
It is more than dutycycle corresponding frequency values in both sides than corresponding frequency values；
Determine target duty than corresponding frequency values according to described corresponding relation；
According to described target duty ratio and its corresponding frequency values, generate PWM drive signal, and drive letter using described PWM
Number drive proportional solenoid.
2. the proportional solenoid driving method based on PWM according to claim 1 it is characterised in that described " according to described
Corresponding relation determines target duty than corresponding frequency values " step include：
First linear interpolation calculating is carried out according to described corresponding relation；
Then determine described target duty than corresponding frequency values according to the result that linear interpolation calculates.
3. the proportional solenoid driving method based on PWM according to claim 2 is it is characterised in that described " pre-set
The step of the corresponding relation of dutycycle and frequency values " includes：
Pre-setting dutycycle is corresponding frequency values when 10%, 50% and 90%, and wherein dutycycle 50% is middle dutycycle,
The corresponding frequency values of dutycycle 50% are maximum, and dutycycle is respectively minimum duty cycle and maximum duty cycle for 10% and 90%, accounts for
Empty more minimum than for 10% and/or 90% corresponding frequency values.
4. the proportional solenoid driving method based on PWM according to claim 3 is it is characterised in that described dutycycle is
When 10% and 90%, corresponding frequency values are identical.
5. the proportional solenoid driving method based on PWM according to any one of claim 1 to 4 is it is characterised in that go back
Including：Hydraulic oil oil temperature in sensing proportional solenoid in real time；
Also include after the step of described " determining target duty than corresponding frequency values according to described corresponding relation "：
According to the method for adjustment of the change with described hydraulic oil oil temperature for the default frequency values, adjust described target duty than corresponding
Frequency values；
The method of adjustment of the change with described hydraulic oil oil temperature for the described default frequency values includes：With described hydraulic oil oil temperature liter
Height, increases described frequency values.
6. a kind of proportional solenoid drive system based on PWM is it is characterised in that include：
Correspondence setting unit, for pre-setting the corresponding relation of dutycycle and frequency values, described corresponding relation medium frequency
The regularity of distribution of value is that the middle corresponding frequency values of dutycycle are more than the corresponding frequency values of both sides dutycycle；
Frequency determinative elements, for determining target duty than corresponding frequency values according to described corresponding relation；
Driving signal generating unit, for according to described target duty ratio and its corresponding frequency values, generating PWM drive signal；
Driver element, for driving proportional solenoid using described PWM drive signal.
7. the proportional solenoid drive system based on PWM according to claim 6 is it is characterised in that described frequency determines
Unit includes：
Computation subunit, for carrying out linear interpolation calculating according to described corresponding relation；
Determination subelement, the result for being calculated according to linear interpolation determines described target duty than corresponding frequency values.
8. the proportional solenoid drive system based on PWM according to claim 7 is it is characterised in that described corresponding relation
Arranging unit includes storing sub-units, and being used for pre-setting dutycycle is corresponding frequency values when 10%, 50% and 90%, wherein
Dutycycle 50% is middle dutycycle, and the corresponding frequency values of dutycycle 50% are maximum, and dutycycle is for 10% and 90% respectively
Little duty when maximum duty cycle, dutycycle is that 10% and/or 90% corresponding frequency values are minimum.
9. the proportional solenoid drive system based on PWM according to any one of claim 6-8 is it is characterised in that go back
Including：
Sensing unit, for the hydraulic oil oil temperature in real-time sensing proportional solenoid；
Adjustment unit, for the method for adjustment of the change with described hydraulic oil oil temperature according to default frequency values, adjusts described mesh
The mark corresponding frequency values of dutycycle；The method of adjustment of the change with described hydraulic oil oil temperature for the described default frequency values includes：With
Described hydraulic oil oil temperature raises, and increases described frequency values.
10. the proportional solenoid drive system based on PWM according to the claims 9 is it is characterised in that described be based on
The proportional solenoid drive system of PWM is arranged in dsp chip or universal cpu.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410473388.7A CN104344055B (en) | 2014-09-16 | 2014-09-16 | Proportional electromagnetic valve driving method and system based on PWM (Pulse Width Modulation) |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410473388.7A CN104344055B (en) | 2014-09-16 | 2014-09-16 | Proportional electromagnetic valve driving method and system based on PWM (Pulse Width Modulation) |
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| CN104344055B true CN104344055B (en) | 2017-02-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104811168A (en) * | 2015-02-14 | 2015-07-29 | 河南辉瑞生物医电技术有限公司 | Dual-duty-ratio switching pulse width modulator driving method |
| CN105042158B (en) * | 2015-06-02 | 2017-12-12 | 浙江联辉智能科技有限公司 | A kind of control method of proportion magnetic valve |
| CN105351596A (en) * | 2015-12-07 | 2016-02-24 | 沈阳工业大学 | Compound control method for proportional electromagnetic valve |
| CN105889603B (en) * | 2016-05-20 | 2018-02-06 | 合肥工业大学 | A kind of PWM control methods for improving high-speed switch electromagnetic valve proportionality |
| CN106225867B (en) * | 2016-07-27 | 2019-05-14 | 北京小米移动软件有限公司 | Cistern water level measurement method and device |
| CN106122566B (en) * | 2016-08-31 | 2019-03-15 | 北京小米移动软件有限公司 | Eliminate the method and device of electromagnetic valve noise |
| CN106594355B (en) * | 2016-12-05 | 2020-03-27 | 广东美的制冷设备有限公司 | Electromagnetic valve switch control method and system and air conditioner |
| KR102372399B1 (en) * | 2017-09-29 | 2022-03-08 | 현대모비스 주식회사 | Apparatus for controlling of solenoid valve |
| CN109724237B (en) * | 2017-10-30 | 2022-03-11 | 青岛经济技术开发区海尔热水器有限公司 | Secondary pressure adjusting method for gas water heater and gas water heater |
| JP2019132356A (en) * | 2018-01-31 | 2019-08-08 | 株式会社デンソー | Current control device |
| CN111645655B (en) * | 2020-05-07 | 2023-10-17 | 沃行科技(南京)有限公司 | Strategy for realizing rapid and accurate control of proportional relay valve based on low-frequency sine microwave algorithm |
| CN112803926B (en) * | 2021-01-19 | 2022-06-10 | 北谷电子有限公司 | Driving method of proportional electromagnetic valve |
| CN113378311B (en) * | 2021-05-06 | 2022-07-08 | 中联重科土方机械有限公司 | Compensation method and device for hysteresis of excavator proportional valve, excavator and processor |
| 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 |
| CN114857333B (en) * | 2022-04-29 | 2023-08-04 | 宁波赛福汽车制动有限公司 | Coil current control method, device and circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100532743C (en) * | 2005-04-01 | 2009-08-26 | Smc株式会社 | Solenoid-operated valve and solenoid-operated valve-driving circuit |
| CN101349358B (en) * | 2008-08-22 | 2010-08-18 | 三一重工股份有限公司 | Control method and control system of proportion valve |
| JP5276426B2 (en) * | 2008-12-16 | 2013-08-28 | 日立建機株式会社 | Electromagnetic proportional valve drive control device and its shipping inspection device |
| CN101718368B (en) * | 2009-12-01 | 2011-12-21 | 三一重工股份有限公司 | Control method and device of proportional solenoid and engineering machinery using device |
| CN101975300A (en) * | 2010-09-27 | 2011-02-16 | 苏明 | Method and device for controlling high-speed electromagnetic switch valve to adapt to pressure change at oil supply port |
| CN203115247U (en) * | 2013-02-25 | 2013-08-07 | 武汉元丰汽车电控系统有限公司 | ABS electromagnetic valve control circuit based on high-frequency PWM |
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