CN114483698B - High-dynamic flexible closing control method for solenoid valves with different strokes - Google Patents
High-dynamic flexible closing control method for solenoid valves with different strokes Download PDFInfo
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- CN114483698B CN114483698B CN202210186837.4A CN202210186837A CN114483698B CN 114483698 B CN114483698 B CN 114483698B CN 202210186837 A CN202210186837 A CN 202210186837A CN 114483698 B CN114483698 B CN 114483698B
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000006073 displacement reaction Methods 0.000 claims description 19
- 238000003491 array Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
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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)
- Mechanical Engineering (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid Mechanics (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The invention discloses a high dynamic flexible closing control method for solenoid valves with different strokes. The invention uses the controller to store the control data and closing phase characteristic data of the electromagnetic valve, and a user can input the required total closing phase duration T and closing time impact speed V of the electromagnetic valve. In the closing stage, a negative voltage source is adopted to enable the coil current to be reduced to 0 rapidly, and then a controller searches solenoid valve control parameters matched with user requirements from a stored array, so that control of the solenoid valve is realized, dynamic characteristics are improved, loss of a valve core is reduced, dynamic characteristics and flexible opening and closing are considered, and the service life of the hydraulic solenoid valve is prolonged.
Description
Technical Field
The invention belongs to the field of hydraulic valve control, and particularly relates to a high-dynamic flexible closing control method for solenoid valves with different strokes.
Background
The seat valve has wide application, the functions of the seat valve are realized by the seat valve in the direction control valve, the pressure control valve and the flow control valve, and an oil path can be connected and disconnected by changing the gap between a valve core and a valve seat of the electromagnetic valve, and when the contact surface of the valve core and the valve seat is tightly contacted under the action of certain pressure, the valve is in a closed state; when a gap exists between the valve core and the valve seat, the oil path is opened. Because the seat valve is sealed by a surface, the sealing performance is required to be high when the electromagnetic valve is closed, and the smoothness of the contact surface of the valve core and the valve seat is required to be high.
The high-speed switch valve is a seat valve structure, for the high-frequency electromagnetic valve, the valve core speed is very fast during the working period, and the valve core generates strong rigid impact at the instant of opening and closing the electromagnetic valve, so that related parts such as the valve core and the like are damaged, the sealing performance of the electromagnetic valve is damaged, and the service life of the high-speed switch valve is shortened. At present, most of high-speed switch valves adopt a control strategy in a closing stage to load a section of zero voltage, so that current keeps naturally descending until a valve core is completely closed, electromagnetic force does not actively participate in the control of the valve core closing stage to speed at the moment, the valve core is closed only by means of restoring force, strong impact is generated between valve core valve seats at the moment of closing the high-speed switch valve, the contact surface of the valve core valve seat is worn, the sealing surface of an electromagnetic valve is damaged, the moving stroke of the valve core in the electromagnetic valve is even increased, and the service life of the electromagnetic valve is greatly influenced. The invention provides a high-dynamic flexible closing control method applicable to electromagnetic valves with different strokes, which not only improves the dynamic characteristics of the electromagnetic valve, but also achieves the effect of flexible closing compared with the existing control method.
Disclosure of Invention
In order to overcome the defects of the prior art, a high-dynamic flexible closing control method for high-speed switching valves with different strokes is provided.
The technical scheme of the invention is as follows:
The invention provides a high-dynamic flexible closing control method for solenoid valves with different strokes, wherein a coil of the solenoid valve is connected with a voltage source through a high-speed change-over switch, and the voltage source at least comprises a negative voltage source, a zero voltage source and an adjustable voltage source; the coil current of the electromagnetic valve is detected by a current detector, and the pressure state of each working port of the electromagnetic valve is obtained in real time by a pressure sensing system; a displacement sensor is arranged in the electromagnetic valve and used for acquiring the movement speed and the position of the valve core; acquiring data in a pressure sensing system in real time through a controller, acquiring current data in a current detector in real time through the controller, and acquiring the position and the movement speed of a valve core detected by a displacement sensor through the controller; the controller is connected with the adjustable voltage source to control the output voltage of the adjustable voltage source by controlling the high-speed change-over switch to select the accessed voltage source; the controller stores electromagnetic valve closing stage characteristic data in an array mode;
Therefore, the controllers share M, N, X, Y and Z groups of electromagnetic valve closing stage characteristic data, X is the number of values of the adjustable voltage starting loading time t1 in a selectable range, Y is the number of values of the adjustable voltage ending loading time t2 in the selectable range, Z is the number of values of the adjustable voltage amplitude U in the selectable range, M is the number of electromagnetic valves with different working strokes, and N is the number of conditions of different working pressures; each group of electromagnetic valve closing stage characteristic data comprises a closing stage total duration T and a closing time impact speed V;
When the falling edge of the control signal arrives, the electromagnetic valve enters a closing stage, the controller firstly controls the high-speed switch to be connected with a negative pressure source, the coil current starts to decrease, when the current detector detects that the current decreases to 0, the controller controls the high-speed switch to be connected with a zero voltage source, the electromagnetic force is kept to be 0N, and the valve core does acceleration movement in the closing stage under the action of spring reset force; and simultaneously, the controller selects an array matched with the demand from the electromagnetic valve closing stage characteristic data according to the total closing stage duration T and the closing time impact speed V demand input by a user, and controls the high-speed change-over switch according to the parameters T1, T2 and U in the array matched with the demand, namely, an adjustable voltage source with the voltage U is connected at the time T1, and the adjustable voltage source is disconnected at the time T2 and is connected with a zero voltage source until the closing stage is finished.
In the invention, the difference of different solenoid valves is mainly that the strokes are different, M is the number of solenoid valves with different working strokes, for example, the stroke of some solenoid valves is 0.2mm, the stroke of some solenoid valves is 0.8mm, and the high-dynamic flexible closing control method for the solenoid valves with different strokes is a characteristic of the invention. The stroke here refers to the movable range of the spool of the high-speed switching valve. In the closing stage of the solenoid valve, for the same solenoid valve (with fixed stroke), under the same working pressure condition and negative voltage driving, the distance that the valve core moves is always fixed each time the coil current drops to 0, and the distance between the valve core and the position in the complete relation state is also fixed when the valve core is in the complete relation state. The array of the invention is suitable for electromagnetic valves of the same type and different strokes. After the current is 0 in the closing stage, the pressure sensor detects the pressure at the moment, the displacement sensor detects the distance between the valve core and the end point at the moment, the electromagnetic valve with the stroke of the electromagnetic valve can be locked according to the parameters, and then the array is matched according to the parameters input by a user.
As a preferable scheme of the invention, before the closing stage, the coil current in the electromagnetic valve (8) is enabled to reach or be maintained at a preset opening maintaining current value, and the opening maintaining current value is a preset value larger than the closing current.
In the closing stage, when multiple groups of t1, t2 and U arrays match the user requirement according to the input parameters of the user, the array with the smallest U is selected as the array executed by the controller.
As a preferred embodiment of the present invention, the shutdown phase characteristic data is obtained by a preliminary test.
Compared with the prior art, the invention has the following beneficial effects:
(1) At present, most hydraulic electromagnetic valves are only loaded with a section of zero voltage in the closing stage, so that the current of the hydraulic electromagnetic valves naturally drops to zero, and the effect of completely closing the electromagnetic valves is achieved; the invention loads negative 24V voltage at the front part of the closing stage to quickly reduce the coil current to zero, thereby improving the dynamic characteristic of the high-speed switch valve when closing.
(2) The database establishes the starting loading time T1 of the adjustable voltage in the closing buffer stage, the ending loading time T2 of the adjustable voltage, the amplitude of the adjustable voltage is U, and the mapping relation between the total closing stage duration T of the corresponding electromagnetic valve and the impact speed V of the closing time is established, so that the control effect of the invention can be expected, and a user can search the corresponding data set by matching the database according to the effect which is actually expected to be achieved.
(3) For the solenoid valves with different strokes, a section of adjustable voltage is continuously loaded after the coil current is zero for a period of time t1 before the closing moment arrives, and the coil regenerates the current, so that electromagnetic force is generated to counteract the spring reset force, the closing moment resultant force is reduced, the impact speed of the solenoid valve at the closing moment is reduced, and the service life of the high-speed switch valve is prolonged.
(4) The invention provides a high dynamic flexible closing control method not aiming at a specific electromagnetic valve, but aiming at one type of electromagnetic valve, the control method can achieve the effect of high dynamic flexible closing aiming at electromagnetic valves with different strokes, and the application range is wider.
(5) The existing flexible closing method of the electromagnetic valve only matches the electromagnetic valve in the closing stage of the electromagnetic valve and introduces proper current to enable the impact speed to reach the expected impact speed, but due to the existence of the current, the valve core of the electromagnetic valve can continuously bear the electromagnetic force in the closing stage, and the electromagnetic force counteracts part of the spring restoring force, so that the resultant force born by the electromagnetic valve in the closing stage is reduced, and the dynamic performance of the electromagnetic valve in the closing stage is reduced. The method maintains for a period of time after the coil current is reduced to 0, and exerts the closing effect of the spring restoring force to the maximum extent.
Drawings
FIG. 1 is a schematic diagram of a specific system for implementing the control method of the present invention in an embodiment;
FIG. 2 is a flow chart of the controller execution of the shutdown phase.
FIG. 3 is a graph of hydraulic valve dynamics for a certain set of data in a database;
FIG. 4 is a graph of control results using the method of the present invention when the solenoid valve travel is 0.2 mm;
FIG. 5 is a graph of the conventional control result when the solenoid valve stroke is 0.2 mm;
FIG. 6 is a graph of control results using the method of the present invention when the solenoid valve travel is 0.8 mm;
Fig. 7 is a graph of the conventional control result when the solenoid valve stroke is 0.8 mm.
Detailed Description
The invention is further illustrated and described below in connection with specific embodiments. The technical features of the embodiments of the invention can be combined correspondingly on the premise of no mutual conflict.
As shown in fig. 1, in order to implement the control method of the present invention, a schematic structural diagram of a control system is provided in this embodiment.
The control system comprises a high-voltage source 1, a stable voltage source 2, a negative voltage source 3, a zero-voltage source 4, an adjustable voltage source 5, a high-speed change-over switch 6, a current detector 7, an electromagnetic valve 8, a pressure sensing system 9, a displacement sensing system 10 and a controller 11;
The high-speed change-over switch 6 comprises five contacts, wherein a first contact 6-1 is connected with the high-voltage source 1, a second contact 6-2 is connected with the stable voltage source 2, a third contact 6-3 is connected with the negative voltage source 3, a fourth contact 6-4 is connected with the zero voltage source 4, a fifth contact 6-5 is connected with the adjustable voltage source 5, a movable contact 6-6 of the high-speed change-over switch 6 is connected with the current detector 7, the current detector 7 is connected with the electromagnetic valve 8, the coil current of the electromagnetic valve is detected by the current detector 7, and the pressure state of each working port of the electromagnetic valve is acquired in real time by the pressure sensing system 9; a displacement sensor 10 is arranged in the electromagnetic valve and used for acquiring the movement speed and the position of the valve core; acquiring data in the pressure sensing system 9 in real time through the controller 11, acquiring current data in the current detector 7 in real time through the controller 11, and acquiring the valve core position and the movement speed detected by the displacement sensor 10 through the controller 11; the controller 11 is connected with the adjustable voltage source 5 to control the output voltage or the output duty ratio thereof; the controller 11 stores electromagnetic valve closing stage characteristic data in an array form; the controller 11 includes a control signal generation unit. The output port of the controller 11 is connected with the high-speed change-over switch and can control the contact state of the movable contact 6-6 and the other 5 contacts, and the controller 11 can also control the output voltage of the adjustable voltage source. A specific hardware diagram is shown in fig. 1.
The controller is internally provided with a database, an input interface is arranged outside the controller, when the current detector detects that the current is zero, the displacement sensor outputs the valve core displacement data detected at the moment to the controller, the controller judges the working stroke of the electromagnetic valve according to the data of the displacement sensor when the current is zero, the pressure sensing system acquires the pressure data at the moment and inputs the pressure data to the controller after the working stroke information of the electromagnetic valve is identified, the controller matches a corresponding data set in the database according to the acquired pressure data, the working stroke information of the electromagnetic valve, the total closing period time T input by a user and the impact speed V at the closing time, the controller locks a group of T1, T2 and U values, and controls the adjustable voltage source to output a voltage with the amplitude of U at the corresponding moment, wherein T1 is the starting loading moment of the adjustable voltage, and T2 is the ending loading moment of the adjustable voltage. The output control flow chart of the adjustable power supply in the off buffer stage is shown in fig. 2. Preferably, in the closing stage, when there are multiple groups of t1, t2 and U arrays matching the user's requirement according to the input parameters of the user, the array with the smallest U is selected as the array executed by the controller.
The method of constructing the database of the present invention is described below:
The method comprises the steps of carrying out a large number of tests on electromagnetic valves with different strokes and different working conditions in the same stroke after current is zero in the closing stage, wherein the electromagnetic valves have different working strokes, the same working stroke corresponds to different working pressures, a large number of experiments are carried out on the electromagnetic valves with a certain specific stroke respectively in the possible working conditions, when the current is zero in the closing stage, a section of voltage with adjustable amplitude is loaded, the initial loading time of the voltage is T1, the end loading time of the voltage is T2, the amplitude of the voltage is U, the values of each group T1, T2 and U correspond to the total time T of the closing stage and the impact speed V of the closing time of one group of electromagnetic valves, under the determined working stroke and working pressure, X is the number of the electromagnetic valves with T1 in the optional range, Y is the number of the electromagnetic valves with T2 in the optional range, Z is the number of the electromagnetic valves with the adjustable amplitude, the initial loading time of the voltage is T1, the end loading time of the voltage is T2, the amplitude of the electromagnetic valves is the number of the same number of the electromagnetic valves with different working parameters which corresponds to the number of the M, and the working parameters of the same working parameters is equal to the number of the M.
The square wave with adjustable output frequency and duty ratio of the controller is used as an electromagnetic valve opening and closing control signal, so that the opening and closing actions of the high-speed switching valve are controlled, and meanwhile, the controller can acquire data in the current detector, the displacement sensing system and the pressure sensing system in real time and generate control signals to perform corresponding control. The control signals are drawn outside the controller in fig. 1. The displacement sensing system can obtain the displacement and the speed of the valve core in real time, and can accurately judge whether the high-speed switch valve is completely opened or completely closed.
In this embodiment, the single duty cycle of the solenoid valve is divided into 6 stages, as shown in fig. 3, each of which is denoted by ①-⑥. Wherein ① represents an on phase, ② represents a steady voltage source maintenance phase, ③ represents an off initial phase, ④ represents an off acceleration phase, ⑤ represents an off buffer phase, and ⑥ represents an off maintenance phase. The start time of stage ① coincides with the control signal rising edge time and the start time of stage ③ coincides with the control signal falling edge time.
In the closing stage of the electromagnetic valve, the negative voltage source 3 is connected to the two ends of the electromagnetic valve coil, in this embodiment, the negative 24V voltage is output, the current can be quickly reduced to zero, after the current is reduced to zero, the zero voltage source (4) is connected to the two ends of the electromagnetic valve, namely, the 0V voltage is connected, at this time, the electromagnetic force is kept to 0N, under the action of the spring reset force, the valve core does acceleration motion in the closing stage, when the current detector detects that the coil current is zero, it inputs signals to the controller, at this time, the controller searches for an array meeting the requirements of users (the searching process is shown in fig. 2, after the current is 0 in the closing stage, the pressure sensor detects the pressure at this time, the displacement sensor detects the distance between the valve core and the end point at this time, the electromagnetic valve can be locked according to the above parameters, and then the parameter matching array input by the user), thus obtaining the time of voltage loading in the closing buffer stage, the electromagnetic force with corresponding amplitude is output, the coil loop generates reverse current, the electromagnetic force is generated, the electromagnetic force resists the reset force of the spring before the electromagnetic force is closed instantaneously, therefore, the instantaneous speed of the moment when the valve core is closed completely is reduced, the high-speed switching valve is reached, the pressure at this time is met, the pressure is shown in fig. 2, the distance between the valve and the valve is damaged, and the requirements of the user is met, and are damaged.
The invention is described below in connection with a complete cycle:
When the rising edge of the control signal generated by the controller comes, the controller controls the movable contact to be communicated with the first contact to enter a first stage, the high voltage source outputs positive 24V voltage, current rapidly rises under the excitation of the voltage, the electromagnetic force is increased, the electromagnetic force overcomes the spring force and the friction resistance to enable the valve core to be fully opened, the stage ① is finished, the displacement sensor recognizes that the valve core is fully opened and then transmits the signal to the controller, the controller controls the movable contact to be disconnected with the first contact, the movable contact is controlled to be communicated with the second contact to enter a stage ②, the stable voltage source outputs maintenance voltage (the maintenance voltage=the maintenance current is obtained in advance according to the self characteristic of the electromagnetic valve and the working condition of the electromagnetic valve), when the falling edge of the signal comes, the stage ② is ended, the stage ③ is entered, the controller controls the movable contact to be communicated with the third contact to enter a stage ③, the negative voltage source outputs negative 24V voltage, the current drops to closing current rapidly, the electromagnetic valve starts to close at the moment, the negative voltage continues to be excited, the current drops to zero rapidly, the current detector transmits a signal to the controller after detecting that the current is zero, the controller controls the movable contact to be communicated with the fourth contact to enter a stage ④, the two ends of the electromagnetic valve are loaded with zero voltage, the current is kept to be 0 at the moment, the electromagnetic force is kept to be 0N, the valve core does acceleration movement in the closing stage under the action of the spring reset force, meanwhile, the pressure sensor detects the pressure at the moment, the displacement sensor detects the distance from the end point of the valve core at the moment, the electromagnetic valve of which stroke the electromagnetic valve is locked according to the parameters, and then the characteristic data of the closing stage meeting the requirements is searched according to the total duration T of the closing stage input by a user and the impact speed V of the closing moment, and an adjustable voltage source (5) with the voltage U is connected at the time t1, under the action of the adjustable voltage source, the coil generates current and the current continuously increases, the electromagnetic valve generates electromagnetic force to resist the reset force generated by the spring, the resultant force is reduced, the impact speed of the electromagnetic valve at the closing time is effectively reduced, when the time t2 arrives, the controller controls the movable contact to be communicated with the fourth contact, the phase ⑥ is entered, under the action of the zero voltage source, the current drops to zero immediately, the valve is completely closed at the phase, the zero voltage source continuously acts until the next period arrives, and the system repeats the process.
Fig. 4 and fig. 5 are a set of comparison simulation results, when in simulation, the internal parameters of the two graphs are the same, the stroke of the electromagnetic valve is 0.2mm, but the control method is different, fig. 4 is a high-dynamic flexible closing control method provided by the invention, fig. 5 is a traditional voltage control method, the displacement of the valve core is gradually changed from 0.2mm to 0mm, and the time consumption of the closing stage of fig. 4 is shorter than that of fig. 5, and the impact instant speed is smaller than that of fig. 5, so that the high-dynamic flexible closing control method can not only improve the dynamic characteristic of the electromagnetic valve in the closing stage, but also weaken the impact force of the electromagnetic valve in the closing instant, thereby prolonging the service life of the electromagnetic valve.
Fig. 6 and fig. 7 are a set of comparison simulation results, when in simulation, the internal parameters of the two graphs are the same, the stroke of the electromagnetic valve is 0.8mm, but the control method is different, fig. 6 is a high-dynamic flexible closing control method provided by the invention, fig. 7 is a traditional voltage control method, the displacement of the valve core is gradually changed from 0.8mm to 0mm, and the time consumption of the closing stage of fig. 6 is shorter than that of fig. 7, and the impact instant speed is smaller than that of fig. 7, so that the high-dynamic flexible closing control method can not only improve the dynamic characteristic of the electromagnetic valve in the closing stage, but also weaken the impact force of the electromagnetic valve in the closing instant, thereby prolonging the service life of the electromagnetic valve.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (4)
1. The high-dynamic flexible closing control method for the solenoid valves with different strokes is characterized in that a coil of the solenoid valve (8) is connected into a voltage source through a high-speed change-over switch (6), and the voltage source at least comprises a negative pressure source (3), a zero voltage source (4) and an adjustable voltage source (5); the coil current of the electromagnetic valve is detected by a current detector (7), and the pressure state of each working port of the electromagnetic valve is obtained in real time by a pressure sensing system (9); a displacement sensor (10) is arranged in the electromagnetic valve and used for acquiring the movement speed and the position of the valve core; acquiring data in a pressure sensing system (9) in real time through a controller (11), acquiring current data in a current detector (7) in real time through the controller (11), and acquiring the position and the movement speed of a valve core detected by a displacement sensor (10) through the controller (11); the controller (11) is connected with the adjustable voltage source (5) to control the output voltage of the adjustable voltage source by controlling the high-speed change-over switch (6) to select the connected voltage source; the controller (11) stores electromagnetic valve closing stage characteristic data in the form of an array;
The controller (11) shares M multiplied by N multiplied by X multiplied by Y multiplied by Z groups of electromagnetic valve closing stage characteristic data, X is the number of values of the adjustable voltage starting loading time t1 in a selectable range, Y is the number of values of the adjustable voltage ending loading time t2 in the selectable range, Z is the number of values of the adjustable voltage amplitude U in the selectable range, M is the number of electromagnetic valves with different working strokes, and N is the number of conditions of different working pressures; each group of electromagnetic valve closing stage characteristic data comprises a closing stage total duration T and a closing time impact speed V;
When the falling edge of the control signal arrives, the electromagnetic valve (8) enters a closing stage, the controller (11) firstly controls the high-speed change-over switch (6) to be connected with the negative pressure source (3), the coil current starts to be reduced, when the current detector (7) detects that the current is reduced to 0, the controller (11) controls the high-speed change-over switch (6) to be connected with the zero voltage source (4), the electromagnetic force is kept to be 0N, and the valve core is accelerated to move in the closing stage under the action of spring reset force; meanwhile, the controller (11) selects an array matched with the requirements from electromagnetic valve closing stage characteristic data according to the total closing stage duration T and closing time impact speed V requirements input by a user, and the controller (11) switches on an adjustable voltage source (5) with voltage being an adjustable voltage amplitude U at the time T1 according to T1, T2 and U parameter control high-speed change-over switches (6) in the array matched with the requirements, and switches on the adjustable voltage source (5) and switches on a zero voltage source (4) at the time T2 until the closing stage is finished.
2. The method according to claim 1, wherein the coil current in the solenoid valve (8) is brought to or maintained at a predetermined on-hold current value, which is a predetermined value greater than the off-current value, before the closing phase.
3. The method for controlling high dynamic flexibility closing of solenoid valves according to claim 1, wherein, in the closing phase, when there are multiple groups of t1, t2, U arrays matching the user's requirement according to the user's input parameters, the array with the smallest U is selected as the array executed by the controller.
4. The method for controlling the high dynamic flexibility closing of solenoid valves according to claim 1, wherein the closing-stage characteristic data is obtained by a preliminary test.
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| CN202210186837.4A CN114483698B (en) | 2022-02-28 | 2022-02-28 | High-dynamic flexible closing control method for solenoid valves with different strokes |
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| CN111810700A (en) * | 2020-01-07 | 2020-10-23 | 浙江工业大学 | High-dynamic high-frequency-response control system and method for electromagnetic valve |
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