CN116658660A - PWM-based high-speed switch valve hysteresis compensation control method - Google Patents

PWM-based high-speed switch valve hysteresis compensation control method Download PDF

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Publication number
CN116658660A
CN116658660A CN202310619345.4A CN202310619345A CN116658660A CN 116658660 A CN116658660 A CN 116658660A CN 202310619345 A CN202310619345 A CN 202310619345A CN 116658660 A CN116658660 A CN 116658660A
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China
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pwm
valve
valve core
opening
current
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邓华
李佺振
王健
张翼
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Central South University
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Central South University
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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
    • 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
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0066—Hydraulic or pneumatic means

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

The application provides a high-speed switch valve hysteresis compensation control method based on PWM, and belongs to the field of high-speed switch valve control. The method is characterized in that the working period of the high-speed switching valve is divided into four stages, the starting and stopping time of the high-speed switching valve is controlled through the rising edge and the falling edge of a reference PWM respectively, and a loading signal consists of a starting compensation PWM, an excitation PWM, an opening maintenance PWM and a closing compensation PWM. And the critical voltage value for opening and closing the valve core is obtained through the pressure change in front of the valve, so that the amplitude of the opening compensation PWM and the opening maintenance PWM is controlled, and the lag time and the current energy consumption of the response of the valve core are reduced. The duty ratio of the exciting PWM is determined through the pressure derivative in front of the valve, the duty ratios of the opening compensation PWM and the closing compensation PWM are obtained according to the coil current, the response speed of the valve core is accelerated, and the current power consumption is optimized. The application can improve the response speed of the high-speed switch valve, reduce the energy consumption and expand the frequency response range, and has the advantages of high response, low power consumption, low cost and small occupied space.

Description

PWM-based high-speed switch valve hysteresis compensation control method
Technical Field
The application relates to the field of control of high-speed switching valves, in particular to a high-speed switching valve hysteresis compensation control method based on PWM.
Background
The high-speed switch valve is fully opened or fully closed, has the advantages of small pressure loss, low energy consumption, strong pollution resistance and the like, and can directly convert digital signals into flow signals through pulse width modulation (Pulse Width Modulation, PWM). However, since the electromagnet of the high-speed switch valve and the valve itself have inductance and inertia, the valve cannot move immediately after receiving the control signal, and lags behind the control signal. The dynamic characteristics of the high-speed switching valve are key factors for measuring the performance of the high-speed switching valve and determining the control precision of the valve control system, and the hysteresis characteristics of the high-speed switching valve can seriously influence the dynamic characteristics of the high-speed switching valve.
In the existing technology for improving the response speed of the high-speed switch valve, the pre-excitation control strategy is relatively simple and easy to realize, and the purpose of reducing the opening and closing lag time of the high-speed switch valve is achieved by preloading a signal to enable the current of the valve core to approach the critical switch value. The Chinese patent application CN113898778B discloses a high-speed electromagnetic valve control system and a method for adapting to the change of working conditions and control parameters, which use current and highest pressure feedback to improve the dynamic characteristics of a high-speed switch valve, reduce the influence of the highest pressure of the system on the dynamic characteristics, reduce the lag time of valve core response, improve the energy conversion efficiency, and ensure that the valve core is not closed in an opening maintaining stage according to the highest pressure loading control signal after the valve core is opened by a pre-excitation method, thereby improving the dynamic performance of the valve core to a certain extent and not remarkably increasing the complexity and occupied space of the system.
However, the pressure before the valve is opened will decrease, and the current value required for maintaining the maximum opening will decrease, so that the current value generated by the control signal applied according to the highest pressure will be greater than the actually required current value, and will generate excessive energy consumption, and in the closing stage of the valve core, the current value higher than the actually required current value will also cause the delay time of the valve core to be prolonged.
Disclosure of Invention
Aiming at the defects of the prior art, the application provides a high-speed switch valve hysteresis compensation control method based on PWM.
The detailed technical scheme of the application is as follows:
a high-speed switch valve hysteresis compensation control method based on PWM is characterized in that the working period of a high-speed switch valve is divided into four stages: an opening compensation phase, a valve core opening phase, an opening maintaining phase and a closing compensation phase. The method comprises the steps that a reference PWM signal is used for controlling the opening and closing time of a high-speed switch valve, an opening compensation PWM, an excitation PWM, an opening maintenance PWM and a closing compensation PWM are introduced in a response period of the high-speed switch valve, firstly, coil current reaches a critical opening current value of a valve core through the opening compensation PWM, and the valve core opening delay time is reduced; the amplitude of the PWM signal is determined to be opened and compensated and kept by opening in real time by combining the pressure in front of the valve, so that the current surplus energy consumption is reduced; determining the valve core motion state through the valve front pressure derivative, and correcting the excitation PWM duty ratio; and detecting the time length of the current falling to 0 in the closing stage of the valve core to determine the duty ratio of the closing compensation PWM, so that the current is ensured not to be reversely increased to prolong the movement time of the valve core, and the current energy consumption is reduced.
The frequency f of the reference PWM 0 And duty cycle τ 0 The valve core is used for controlling the opening and closing time of the high-speed switch valve, and determining the opening time length in one period of the valve core, so as to control the flow of the outlet of the high-speed switch valve.
The on-compensation PWM frequency f 1 Equal to the reference PWM frequency, the variable amplitude U1 and the duty ratio tau are obtained through the pressure before the valve 1 The initial value and the circulating value are used for controlling the loading time of the amplitude signal, so that the coil current reaches the critical opening value at the moment when the rising edge of the reference PWM arrives, and the valve core opening delay time is reduced.
The frequency f of the excitation PWM 2 Equal to the reference PWM frequency, the amplitude is the rated voltage value of the high-speed switch valve, and the duty ratio tau 2 The valve core is divided into an initial value and a circulating value, and is used for controlling the current to rise rapidly, reducing the valve core opening movement time and enabling the valve core to be opened and in a full-open state.
The opening maintains the frequency f of PWM 3 Equal to the reference PWM frequency, the amplitude changes along with the pressure value before the valve, and the duty ratio tau 3 For a reference PWM duty cycle τ 0 And excitation PWM duty cycle τ 2 For controlling the valve core to be always in the fully open stateThe current value of (2) is as small as possible, and the valve core closing delay time is reduced.
The frequency f of the off-compensation PWM 4 Equal to the reference PWM frequency, the amplitude is the maximum negative rated voltage, the duty cycle is tau 4 Corresponding to the duration of the current drop to zero. The valve core closing mechanism is used for controlling the coil current to quickly drop and reducing the valve core closing movement time.
Compared with the prior art, the application has the following beneficial effects:
according to the high-speed switching valve hysteresis compensation control method based on PWM, the current signal is compensated in advance before the valve core opening time comes, so that the valve core opening delay time is reduced.
The opening is determined to keep PWM amplitude by combining the actual pressure before the valve in the full-opening stage of the valve core, and compared with the application of the amplitude by using the highest pressure of the system, the magnitude of the current is further reduced, and the delay time of closing the valve core and the redundant energy consumption of the current are reduced.
The closing compensation PWM loads negative signals, so that the influence of coil remanence is reduced, the duty ratio of the coil is fed back according to current, the coil current value is not reversely increased, the closing movement time of the valve core is shortened, meanwhile, no redundant current is generated, and the energy consumption is reduced.
The hysteresis time of the valve core movement is reduced through hysteresis compensation control, the response speed of the valve core is improved, and the frequency response range of the valve core is expanded.
Drawings
FIG. 1 is a schematic diagram of hysteresis compensation control in an embodiment of the present application.
FIG. 2 is a graph of the derivative of the valve front pressure versus the displacement of the valve spool in an embodiment of the present application.
FIG. 3 is a diagram of a hysteresis compensation control drive signal in an embodiment of the present application.
FIG. 4 is a graph of the dynamic response of a hysteresis compensation control spool in an embodiment of the present application.
FIG. 5 is a graph comparing the response of independent PWM control, adaptive duty control, and hysteresis compensation control spool displacement.
FIG. 6 is a graph comparing independent PWM control, adaptive duty control, and hysteresis compensation control coil current responses.
FIG. 7 is a graph of current consumption versus stand-alone PWM control, adaptive duty control, and hysteresis compensation control.
FIG. 8 is a graph of independent PWM controlled spool displacement response.
FIG. 9 is a graph of 100Hz hysteresis compensation control spool displacement response.
Detailed Description
The following describes the technical scheme of the present application fully with reference to the embodiments of the present application and the accompanying drawings.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof. The numerical values presented are also only preferred numerical values for describing the embodiments.
As shown in fig. 1, the embodiment of the application provides a PWM-based high-speed switching valve hysteresis compensation control method, which is characterized in that the working cycle of the high-speed switching valve is divided into four phases: an opening compensation phase, a valve core opening phase, an opening maintaining phase and a closing compensation phase. And the high-speed switching valve is controlled to be opened and closed by a reference PWM signal, and an opening compensation PWM, an excitation PWM, an opening maintenance PWM and a closing compensation PWM are introduced in the response period of the high-speed switching valve.
The duty ratio of the excitation PWM and the closing compensation PWM is related to the feedback of the valve core movement process, and the duty ratio of the opening compensation PWM and the opening maintenance PWM is related to the excitation PWM and the closing compensation PWM, so that the initial value of the duty ratio is required to be designated for each PWM before the valve core completes one complete opening and closing movement, and the valve core moves normally.
Before the rising edge of the reference PWM comes, the opening compensation PWM with the amplitude changing along with the pressure before the valve is loaded, so that the coil current rises to the vicinity of the critical opening current of the valve core, and the time for the current to rise from 0 to the critical opening current of the valve core when the opening signal comes is reduced. The valve core is not opened and needs a coefficient to correct the amplitude U1 of the opening compensation PWM, and when the coefficient is 0.95, the valve core is not opened in advance, and the amplitude of the opening compensation PWM is providedWherein N is the number of turns of the coil; l (L) c Is the magnetic path length of the magnetic core; lambda is the leakage inductance; u is the relative permeability; l (L) 0 Is the initial air gap length; u (u) c Is magnetic permeability of the magnetic core; s is the effective sectional area of the armature; mu (mu) 0 Is vacuum magnetic permeability; r is coil equivalent resistance; p (P) s Is the pre-valve pressure; a is that s Is the effective acting area of the pressure oil. Starting compensation PWM (pulse Width modulation) first period duty cycle initial value is tau 10 ＝1-τ 0 The method comprises the steps of carrying out a first treatment on the surface of the Starting compensation PWM second period duty cycle initial value is tau 11 ＝1-τ 0 -τ 40 。
When the valve core opening signal, namely the rising edge of the reference PWM, is arrived, the exciting PWM with the amplitude of U2 = 24V is loaded, so that the current is quickly risen to open the valve core. The first period of the excitation PWM needs to ensure that the valve core is completely opened, and the initial value of the duty ratio of the first period of the excitation PWM is tau 20 ＝τ 0 /2。
As shown in fig. 2, which is a graph of the derivative of the valve front pressure versus the displacement of the valve spool, the charge opening maintains PWM when the valve spool is in the closed state to the fully open state. Because the displacement sensor is not easy to install in the high-speed switch valve, the change of the valve front pressure is used for judging the position state of the valve core, and the valve core is opened when the derivative of the valve front pressure is smaller than zero. Calculating the time t2 from the rising edge of the reference PWM to the time when the derivative of the pre-valve pressure is less than zero, and correcting the valve core by a factor to ensure that the valve core is in a full-open state when the amplitude of the excitation PWM is 0When the coefficient is 2 and the excitation PWM amplitude is 0, the valve core just reaches the full-open state, and τ exists 2 ＝2t 2 f 0 。
When the valve core is fully opened, in order to ensure that the valve core is normally opened and the current is as small as possible, the opening of the loading amplitude U3 along with the pressure change before the valve keeps PWM, and the correction coefficient is 1.05, if soWherein N is the number of turns of the coil; l (L) c Is the magnetic path length of the magnetic core; lambda is the leakage inductance; u is the relative permeability; l (L) 0 Is the initial air gap length; u (u) c Is magnetic permeability of the magnetic core; s is the effective sectional area of the armature; mu (mu) 0 Is vacuum magnetic permeability; r is coil equivalent resistance; p (P) s Is the pre-valve pressure; a is that s Is the effective acting area of the pressure oil; x is x max Is the maximum displacement of the valve core. The opening keeps the initial value of the first period duty cycle of PWM to be tau 30 ＝τ 0 -τ 20 ＝τ 0 /2. The opening keeps the duty cycle of the subsequent PWM cycle to be tau 3 ＝τ 0 -τ 2 。
When the valve core closing signal, namely the reference PWM (pulse width modulation) falling edge arrives, in order to enable the valve core to be closed quickly, coil current needs to be reduced quickly, closing compensation PWM with the loading amplitude of U4-24V is loaded, the influence of inductance is reduced, and the coil current is unloaded quickly. The too large or too small duty ratio of the closing compensation PWM can influence the closing time of the valve core, the too large duty ratio can enable the current to reversely increase after being reduced to zero, and the electromagnetic force is increased again; too small a duty cycle will result in the current not falling rapidly to zero. Therefore, in order to ensure that the coil current can drop to zero in the first period, the duty ratio of the follow-up period of the closing compensation PWM is conveniently calculated, the valve core is not opened for the second time, and the initial value tau of the duty ratio of the first period of the closing compensation PWM is taken 40 ＝0.09τ 0 . Collecting the current value of the coil current through a current sensor, calculating the time t4 from the falling edge of the reference PWM to the falling of the coil current to zero, and closing the duty ratio tau for compensating the follow-up period of the PWM 4 ＝t 4 f 0 。
Obtaining electricity from the relationship between voltage and currentThe time for the flow to rise to the critical on current value isWherein: l is coil inductance; i 0 Initial current for the coil; r is coil equivalent resistance; i is a critical on current value. The time for the current obtained by the current sensor to drop to 0 is 0.0028 seconds, that is, the loading time for closing the compensation is 0.0028 seconds, the time for the current to rise to the maximum value when the voltage U1 is loaded is 0.0246 seconds, in order for the current value to be small in any time period, the time for which the reference PWM amplitude is 0 when the duty ratio is 0.5 according to the frequency of 10Hz, the amplitude of the on compensation PWM needs to be 0,0.0226/0.0028=8.07 within 0.0226 seconds after the closing compensation is finished, and in order for the current to rise to the maximum value, the coefficient is rounded down to 8, the duty ratio of the subsequent period of the on compensation PWM is τ 1 ＝1-τ 0 -8τ 4 。
The pressure before the valve gradually rises from 0 to a set maximum pressure value, so when the reference PWM is directly loaded at the moment 0, the overcome hydraulic pressure is 0 and the actual dynamic response of the valve core at the maximum working pressure cannot be reflected, and therefore the reference PWM needs to be delayed for a period of time to ensure that the pressure before the valve rises to the maximum value, and the valve accords with the actual working condition better. The delay time of the reference PWM is t d0 ＝τ 10 /f 0 ＝(1-τ 0 )/f 0 。
The first period of the on compensation PWM does not need delay, and because the frequency of the on compensation PWM is consistent with the reference PWM, the second period of the on compensation PWM needs delay to close the time length corresponding to the initial value of the duty ratio of the compensation PWM to be t d11 ＝τ 40 /f 0 ＝0.09τ 0 /f 0 . The delay of the subsequent period of the start compensation PWM is t d1 ＝8τ 4 /f 0 ＝8t 4 。
Since the excitation PWM is loaded at the rising edge of the reference PWM, the delay of the excitation PWM is the same as the delay of the reference PWM. The aperture maintenance PWM is loaded after the excitation PWM, and the frequency of the aperture maintenance PWM is consistent with the reference PWM, so that the delay of the aperture maintenance PWM in the first period is t d30 ＝t d0 +τ 20 /f 0 ＝(1-τ 0 )/f 0 The delay of the subsequent period is t d3 ＝τ 2 /f 0 ＝2t 2 。
The off-compensation PWM is loaded at the falling edge of the reference PWM, and in the following period, the duty ratio of the off-compensation PWM is related to the current falling time of the previous period and the falling edge of the reference PWM, and the duty ratio output is zero before the current falling time of the previous period is obtained, so that only the delay time of the initial value of the first period is required to be set as t d40 ＝1/f 0 The subsequent cycle does not require a delay.
The driving signals of the high-speed switching valve hysteresis compensation control method based on PWM are shown in fig. 3.
The following experiments were performed in a simulation environment in combination with specific examples:
the system is modeled in the simulation by taking the following parameters: two-position three-way high-speed Guan Changbi cartridge valves are used as research objects, and specific parameters are as follows: the diameter of the steel ball is 3.2mm, the diameter of the valve rod is 1.2mm, the valve core stroke is 0.5mm, the valve port diameter is 2.2mm, the mass of the moving part is 15.1g, the number of turns of the coil is 900, the internal resistance of the coil is 10.2 omega, the leakage magnetic coefficient is 1.6, the initial air gap length is 0.6mm, the armature diameter is 7.5mm, the armature length is 22mm, the pump flow is 8L/min, the reference PWM frequency is 10Hz, the duty ratio is 0.5, the amplitude is 24, and the overflow valve pressure is 6Mpa.
The control effect is as follows:
FIG. 4 is a graph of the dynamic response of the hysteresis compensation control spool, showing that the spool displacement fits well with the ideal displacement for subsequent cycles other than the first cycle for which the duty cycle initial value is set; before the valve core is opened, the current of the coil rises firstly, then the valve core is quickly lifted and opened, and after the valve core is opened, the current drops and then drops to 0.
FIG. 5 is a graph showing the comparison of the valve core displacement response of independent PWM control, adaptive condition control and hysteresis compensation control, the left graph shows the comparison of the valve core opening state, and the right graph shows the comparison of the valve core closing state, because the application considers the change of the valve front pressure in the running process, the application compares the high-speed electromagnetic valve control system and the method which are disclosed by CN113898778B and adapt to the change of the working condition and the control parameter, and the result shows that the overall time of the valve core hysteresis is 6.4ms for adaptive condition control, 26ms for independent PWM control and 5.7ms for hysteresis compensation control, which is improved by 10.9% compared with the adaptive condition control and 78.1% compared with the independent PWM control.
FIG. 6 is a graph comparing coil current responses of independent PWM control, adaptive mode control and hysteresis compensation control, and shows that in the opening hold phase, the hysteresis compensation control is significantly lower than the independent PWM control, and because the valve core is opened and the valve front pressure is gradually reduced, the current in the opening hold phase of the hysteresis compensation control is slightly smaller than that in the adaptive mode control.
Fig. 7 is a graph of current energy consumption for the independent PWM control, the adaptive duty control, and the hysteresis compensation control, wherein the energy consumed for 20 seconds is 242.9W for the adaptive duty control, 494.8W for the independent PWM control, and 174.8W for the hysteresis compensation control, which reduces the energy consumption by 28% compared to the adaptive duty control, and by 64.7% compared to the independent PWM control, respectively.
The duty ratio is kept unchanged at 0.5, the frequency response range of the valve core displacement is changed by changing the frequency test valve core of the PWM signal, as shown in FIG. 8, which shows the valve core displacement response curves under the independent PWM control of different reference PWM frequencies, and the result shows that the valve core cannot be normally closed after the frequency exceeds 30Hz under the independent PWM control. As shown in fig. 9, the displacement response curve of the valve core with the reference PWM frequency of 100Hz under the hysteresis compensation control shows that the valve core can still be normally closed when the hysteresis compensation control is performed at the frequency of 100Hz, and compared with the independent PWM control, the frequency response range of the valve core is improved by 70%.
From the above results, the high-speed switch valve hysteresis compensation control method based on PWM provided by the application can effectively reduce the power loss of the coil and the overall hysteresis time of opening and closing the valve core.
While the application has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present application. The protection scope of the present application is defined by the claims.

Claims (3)

1. A high-speed switch valve hysteresis compensation control method based on PWM is characterized in that: the duty cycle of the high-speed switching valve is divided into four phases: an opening compensation stage, a valve core opening stage, an opening holding stage and a closing compensation stage; the starting and closing time of the high-speed switch valve is controlled by a reference PWM signal, and the starting compensation PWM, the excitation PWM, the opening maintenance PWM and the closing compensation PWM are introduced in the response time period of the high-speed switch valve; firstly, enabling coil current to reach a critical valve core opening current value through opening compensation PWM, and reducing valve core opening delay time; the amplitude of the PWM signal is determined to be opened and compensated and kept by opening in real time by combining the pressure in front of the valve, so that the current surplus energy consumption is reduced; determining the valve core motion state through the valve front pressure derivative, and correcting the excitation PWM duty ratio; and detecting the time length of the current falling to 0 in the closing stage of the valve core to determine the duty ratio of the closing compensation PWM, so that the current is ensured not to be reversely increased to prolong the movement time of the valve core, and the current energy consumption is reduced.
The frequency and the duty ratio of the reference PWM are used for controlling the opening and closing time of the high-speed switching valve, and determining the opening time length in one period of the valve core, so as to control the flow of the outlet of the high-speed switching valve.
The starting compensation PWM frequency is equal to the reference PWM frequency, the variable amplitude U1, the duty ratio initial value and the circulation value are obtained through the pressure in front of the valve, the duty ratio initial value and the circulation value are used for controlling the loading time of an amplitude signal, the coil current reaches the critical starting value at the moment when the rising edge of the reference PWM arrives, and the valve core starting delay time is reduced.
The exciting PWM frequency is equal to the reference PWM frequency, the amplitude is the rated voltage value of the high-speed switch valve, the duty ratio is divided into an initial value and a circulating value, and the exciting PWM frequency is used for controlling the current to rise rapidly, reducing the valve core opening movement time and enabling the valve core to be opened and in a full-open state.
The opening keeps the frequency of PWM equal to the reference PWM frequency, the amplitude changes along with the pressure value before the valve, the duty ratio is the difference value between the reference PWM duty ratio and the exciting PWM duty ratio, and the opening is used for controlling the current value of the valve core to be as small as possible when the valve core is always in a full-open state, and reducing the closing delay time of the valve core.
The frequency of the closed compensation PWM is equal to the frequency of the reference PWM, the amplitude is the maximum negative rated voltage, and the duty ratio corresponds to the time period when the current drops to zero. The valve core closing mechanism is used for controlling the coil current to quickly drop and reducing the valve core closing movement time.
2. The PWM-based high-speed switching valve hysteresis compensation control method according to claim 1, characterized in that: the opening is determined to keep PWM amplitude by combining the actual pressure before the valve in the full-opening stage of the valve core, and compared with the application of the amplitude by using the highest pressure of the system, the magnitude of the current is further reduced, and the delay time of closing the valve core and the redundant energy consumption of the current are reduced.
3. The PWM-based high-speed switching valve hysteresis compensation control method according to claim 1, characterized in that: the closing compensation PWM loads negative signals, so that the influence of coil remanence is reduced, the duty ratio of the coil is fed back according to current, the coil current value is not reversely increased, the closing movement time of the valve core is shortened, meanwhile, no redundant current is generated, and the energy consumption is reduced.
CN202310619345.4A 2023-05-30 2023-05-30 PWM-based high-speed switch valve hysteresis compensation control method Pending CN116658660A (en)

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Application Number Priority Date Filing Date Title
CN202310619345.4A CN116658660A (en) 2023-05-30 2023-05-30 PWM-based high-speed switch valve hysteresis compensation control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310619345.4A CN116658660A (en) 2023-05-30 2023-05-30 PWM-based high-speed switch valve hysteresis compensation control method

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CN116658660A true CN116658660A (en) 2023-08-29

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