CN111828715A - Control system and method for realizing rapid movement of electromagnetic valve - Google Patents
Control system and method for realizing rapid movement of electromagnetic valve Download PDFInfo
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- CN111828715A CN111828715A CN202010014878.6A CN202010014878A CN111828715A CN 111828715 A CN111828715 A CN 111828715A CN 202010014878 A CN202010014878 A CN 202010014878A CN 111828715 A CN111828715 A CN 111828715A
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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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- 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
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
Abstract
The invention discloses a control system and a control method for realizing rapid movement of an electromagnetic valve. The system comprises a pre-loading high-voltage source, a pre-loading voltage-stabilizing source, a high-voltage source, a voltage-stabilizing source, a negative voltage source, a zero-voltage source, a high-speed change-over switch, a current detector, an electromagnetic valve, a pressure sensing system and a controller; the pre-loading high-voltage source is loaded in advance before the expected opening and closing time of the electromagnetic valve, and the coil current is kept in a state slightly smaller than the opening current through the pre-loading voltage stabilizing source. In the starting stage, a high-voltage source is adopted for excitation, so that the current rises rapidly, and the movement time in the starting stage is reduced; in the closing stage, the current is rapidly reduced to 0 by adopting the excitation of a negative voltage source, and the movement time of the closing stage is reduced.
Description
Technical Field
The invention relates to the field of electromagnetic valve control, in particular to a control system and a control method for realizing rapid movement of an electromagnetic valve.
Background
In the solenoid valve, the ampere-turns and the working air gap have the greatest influence on the electromagnetic force of the electromagnet. Ampere-turns is the product of the number of turns of the coil and the current in the single coil. In the case where the magnetic flux is not saturated, the larger the current, the larger the electromagnetic force; the smaller the working air gap, the greater the electromagnetic force. Since the solenoid valve is usually opened when the working air gap in the electromagnet is largest, and closed when the working air gap in the electromagnet is smallest, the opening current is larger than the closing current.
At present, most hydraulic electromagnetic valves adopt a single-voltage control mode, namely after the electromagnetic valve is powered on, the driving voltage increases the current in a circuit, meanwhile, the electromagnetic force generated by the current is increased, and when the electromagnetic force is increased enough to overcome the working resistance of an electromagnet, the electromagnetic valve is opened; after the driving voltage is closed, the current in the circuit is reduced, the electromagnetic force is reduced along with the current, and when the electromagnetic force is reduced to be insufficient to overcome the working resistance of the electromagnetic valve, the electromagnetic valve begins to reset.
However, this method is not suitable for applications where high demands are made on the dynamic response of the solenoid valve. Due to the inductive effect of the electromagnet and the coil, a certain hysteresis is created both at the moment of opening and closing the valve. If a smaller driving voltage is adopted, the rising speed of the current is slow in the starting stage, so that a longer starting lag time is caused; if a larger driving voltage is used, a longer turn-off delay time may be caused due to a large initial current during turn-off. Therefore, the single voltage source control method cannot simultaneously shorten the lag time of the solenoid valve during opening and closing.
In the prior art, a multi-voltage source mode is adopted in the field of high-frequency electromagnetic valves to achieve a high-frequency control function, and a high-voltage source is adopted as excitation voltage in a patent [ CN201610015304.4] to enable the electromagnetic valves to be opened in a short time; the voltage-stabilized power supply provides a maintaining voltage to keep the current at a value slightly larger than the closing current; the negative voltage source provides a large reverse voltage to reduce the current to the off current in a short time. The purpose of shortening the lag time of the electromagnetic valve during opening and closing simultaneously is achieved.
However, the above-mentioned multi-voltage source control method performs high-voltage excitation only when the rising edge of the control signal arrives, and does not pay attention to the stage before the arrival of the control signal, that is, before the solenoid valve starts to work, and this stage has a significant influence on the movement cycle and the movement frequency of the solenoid valve, and the design and improvement of this stage can greatly increase the working frequency of the high-frequency solenoid valve.
Disclosure of Invention
In order to solve the difficulties, the invention provides a control system and a method for realizing rapid movement of an electromagnetic valve.
The invention discloses a control system for realizing rapid movement of an electromagnetic valve, which comprises a pre-loading high-voltage source, a pre-loading voltage-stabilizing source, a high-voltage source, a voltage-stabilizing source, a negative voltage source, a zero-voltage source, a high-speed change-over switch, a current detector, a pressure sensing system and a controller, wherein the pre-loading voltage-stabilizing source is connected with the high-voltage source;
the high-speed change-over switch is provided with seven contact heads, wherein the first contact head is connected with a pre-loading high-voltage source, the second contact head is connected with a pre-loading voltage stabilizing source, the third contact head is connected with the high-voltage source, the fourth contact head is connected with the voltage stabilizing source, the fifth contact head is connected with a negative voltage source, the sixth contact head is connected with a zero-voltage source, and the seventh contact head is connected with a current detector; the current detector is connected with a coil of the electromagnetic valve, and the pressure sensing system is connected with each working port of the electromagnetic valve and used for obtaining the pressure state of each working port of the electromagnetic valve; the controller is connected with the pressure sensing system and comprises a control signal generating unit; and the output port of the controller is connected with the high-speed switch and can control the contact state of the seventh contact and the rest 6 contacts.
As a preferred embodiment of the present invention, the control signal generated by the control signal generating unit is a square wave signal, a duty ratio of the square wave signal, i.e., a ratio between a target opening time and a target cycle time of the solenoid valve, a high potential of the square wave signal represents that an operator wants the on-off valve to be in an open state, and a low potential of the square wave signal represents that the operator wants the on-off valve to be in a closed state. The control signal is generated by an operator through programming of a control signal generating unit inside the controller, and the control signal participates in the operation inside the controller. The controller acquires the duty ratio, the frequency, the rising edge moment and the falling edge moment of the control signal generated by the control signal generating unit in real time. When the control signal is changed, the controller can also know the duty ratio, the frequency, the rising edge time and the falling edge time of the changed control signal, so that the controller can know when the rising edge of the control signal of the next period comes.
The invention also discloses a control method of the control system for realizing the rapid movement of the electromagnetic valve, which comprises the following steps:
the controller generates a control signal, calculates the time required for increasing the coil current to the pre-loading current by adopting the pre-loading excitation voltage according to the current coil current state and the coil parameters before the rising edge of the control signal comes, and takes the time as the duration of the pre-loading excitation stage; according to the duration of the preloading excitation stage, the controller enables the seventh contact head and the first contact head to be communicated in advance to enter the preloading excitation stage; under the action of the preloading high voltage source, the current of the coil reaches a preloading current value;
the controller controls the seventh contact and the second contact to be communicated to enter a preloading maintaining stage, and the current is always maintained in a preloading current state under the action of the preloading voltage stabilizing source;
when the rising edge of the control signal comes, the controller controls the seventh contact head and the third contact head to be communicated to enter an opening stage, the current of the coil is rapidly increased under the excitation of a high-voltage source, then the valve core starts to move, and the electromagnetic valve enters an opening stage; the high voltage source continues to be maintained until full opening of the solenoid valve is ensured;
the controller controls the seventh contact and the fourth contact to be communicated to enter a maintaining stage, the current of the coil gradually decreases under the action of the voltage stabilizing source, and finally the coil is stabilized in a maintaining current state which is larger than the set proportion of the closing current so as to keep the opening state of the electromagnetic valve;
when the falling edge of the control signal comes, the controller controls the seventh contact and the fifth contact to be communicated to enter a closing stage, the current rapidly drops to a closing current under the action of the negative voltage source, the electromagnetic valve starts to be closed at the moment, and the negative voltage source continues to be excited until the current is reduced to 0;
and the controller controls the seventh contact and the sixth contact to be communicated to enter a closing maintenance stage, and the coil is kept in a zero current state under the action of a zero voltage source until the next period.
In the scheme, the voltage value of the pre-loading voltage stabilizing source is slightly smaller than the product of the resistance of the solenoid valve coil and the opening current, and is generally smaller than 5% -10% of the product of the resistance of the solenoid valve coil and the opening current, namely the pre-loading voltage stabilizing source is adopted for excitation, when the current is stable, the current is smaller than 5% -10% of the opening current, and the current is pre-loading current; the voltage value of the voltage stabilizing source is slightly larger than the product of the coil resistance and the closing current of the electromagnetic valve, generally larger than 5-10% of the product of the coil resistance and the closing current of the electromagnetic valve, namely the voltage stabilizing source is adopted for excitation, and when the current is stable, the current is larger than 5-10% of the opening current
The calculation of the duration required for the pre-load excitation phase (phase 1) in the scheme is: the controller calculates the time required by the current of the coil to rise to the preloading current according to the current driving voltage, the current of the solenoid valve, the linear inductance resistance and the inductance, and the time is used as the duration time of the stage 1;
the duration required for the preload maintenance phase (phase 2) in the scheme is: the duration is 1-2 ms under normal conditions, and the duration can be increased or decreased properly according to different working conditions;
the calculation of the duration required for the start-up phase (phase 3) in the scheme is: the duration time of the high voltage is equal to the time required by the electromagnetic valve to complete the stroke by adopting the high voltage source to excite the electromagnetic valve in a 0 current state, namely the duration time of the stage 3;
the calculation of the duration required for the maintenance phase (phase 4) in the scheme is: the time from the end time of the stage 3 to the arrival time of the falling edge of the control signal lasts;
the calculation of the duration required for the shutdown phase (phase 5) in the scheme is: the time required for the current after the stage 4 to be reduced to 0 current under the excitation of the reverse voltage;
the duration required to turn off the maintenance phase (phase 6) in the scheme is calculated as: the time that the end time of phase 5 lasts until the start time of the next phase 1.
The invention has the beneficial effects that:
(1) and in the preloading stage (comprising the stage 1 and the stage 2), two-stage voltage source excitation is adopted, namely, a preloading high voltage source is firstly used for excitation, so that the current of the coil is quickly increased to a preloading current value. And then the current is maintained in a pre-loading current state by a pre-loading voltage stabilizing source. Conventional methods for implementing the preload current function typically employ a single voltage for the preload excitation, since the preload current is a relatively fixed value, and the corresponding preload voltage is also relatively fixed in combination with the current resistance situation, and is equal to the product of the preload current and the resistance. The magnitude is small relative to some higher voltage sources and therefore the rate of increase of the current at the preload voltage is slow, resulting in a longer time required for the current to increase to the preload current and an extended overall preload process. Therefore, for some high-frequency switches, the method of preloading by using a single voltage source often cannot meet the requirement of higher-frequency on-off. Furthermore, as the duty cycle varies, when the duty cycle is high, the time left to open the preload stage is reduced, and when the time is reduced such that the current cannot rise to the preload current, the effect of the preload stage is further reduced. Therefore, there are many limitations to the method of performing the preloading using a single voltage. Compared with a control mode that only one section of voltage source is used in the preloading stage, the method provided by the invention has the advantages that the high voltage source is adopted for excitation, the current rising rate is higher, the current can rise to the preloading current state more quickly, and the time consumption of the preloading stage is shorter. The method is suitable for occasions with higher switching frequency.
(2) Because the coil current is maintained in a state slightly smaller than the opening current of the electromagnetic valve after the preloading stage is finished, the opening current can be reached in a short time in the opening stage of the stage 3, and the electromagnetic valve is opened immediately, so that the dynamic characteristic of the opening stage of the electromagnetic valve is better, and the lag time of the electromagnetic valve during opening is shortened.
(3) Generally, the dynamic characteristics of a solenoid valve are weak, while the current dynamic characteristics of the solenoid coil are good. In the prior art, as in patent [ CN201610015304.4], the high voltage source is switched to a lower steady voltage source immediately after the current is increased to the opening current, which results in that the dynamic characteristic of the solenoid valve is weaker and the current dynamic characteristic of the solenoid coil is better, so that when the coil current reaches the opening current, the valve is still in the opening motion state and does not complete the stroke. At this time, the high voltage source is immediately switched to the steady voltage source, so that the driving force of the opening stage of the electromagnetic valve is reduced, and the dynamic characteristic of the opening stage of the electromagnetic valve is reduced. In this patent, the duration of phase 3 is defined as the time required for the solenoid valve to be energized to complete its stroke with the high voltage source in the 0 current state. Since, if the valve is fully opened by the high voltage excitation in the 0 current state, the same excitation time is certainly sufficient to fully open the valve already with a certain pre-load current (the dynamic characteristics of the opening phase can be maximally ensured by continuing the high voltage excitation during this time).
(4) In the prior art, as in patent [ CN201610015304.4], during the closing phase of the solenoid valve, the current is reduced to the closing current by a negative voltage and then is switched to zero voltage immediately. The method has the disadvantages that when the dynamic characteristic of a part of switch valves is weak and the current dynamic characteristic of the electromagnetic coils is good, when the current is reduced to a closing current, the valve is in a closing motion state, and at the moment, the negative voltage is switched to zero voltage, so that the driving force of the electromagnetic valve in the closing stage is reduced, and the dynamic characteristic of the valve in the closing stage is reduced. In stage 5 of the present patent, negative voltage is used to directly reduce the current to 0, because the electromagnetic force generated during 0 current is the least, the driving force during closing is the largest, and the valve is the fastest to close.
(5) The multi-voltage source control mode greatly shortens the time of the voltage at a high position in one period, can reduce the heating of the coil to the maximum extent and prolongs the service life of equipment.
Drawings
FIG. 1 is a schematic structural diagram of a high dynamic control system of a solenoid valve according to the present invention;
FIG. 2 is a graph of control signals and current curves of the present invention;
FIG. 3 is the opening and closing characteristics of a single voltage driven solenoid valve;
FIG. 4 is a graph illustrating the on and off characteristics of a solenoid valve driven by the system and method of the present invention.
Detailed Description
The invention is further described with reference to the drawings and the specific embodiments in the following description.
As shown in fig. 1, the system of the present embodiment includes a preload high voltage source (1), a preload regulated voltage source (2), a high voltage source (3), a regulated voltage source (4), a negative voltage source (5), a zero voltage source (6), a high-speed switch (7), a current detector (8), an electromagnetic valve (9), a pressure sensing system (10), and a controller (11). The controller 11 comprises a control signal generating unit, the control signal 12 is generated by an operator through programming of the control signal generating unit in the controller, and the control signal participates in operation in the controller. The controller 11 acquires the duty ratio, the frequency, the rising edge time and the falling edge time of the control signal generated by the control signal generating unit in real time.
The high-speed change-over switch (7) is also provided with seven contact heads, wherein a first contact head (7-1) is connected with a pre-loading high-voltage source (1), a second contact head (7-2) is connected with a pre-loading stable-voltage source (2), a third contact head (7-3) is connected with a high-voltage source (3), a fourth contact head (7-4) is connected with a stable-voltage source (4), a fifth contact head (7-5) is connected with a negative-voltage source (5), a sixth contact head (7-6) is connected with a zero-voltage source (6), and a seventh contact head (7-7) is connected with a current detector (8). The current detector (8) is connected with a coil of the electromagnetic valve, and the pressure sensing system is connected with the electromagnetic valve, so that the pressure state of each working port of the electromagnetic valve is obtained in real time. The controller (11) is connected with the pressure sensing system, and the controller (11) comprises a control signal generating unit. And the output port of the controller (11) is connected with the high-speed switch and can control the contact state of the seventh contact (7-7) and the rest 6 contacts.
And the controller acquires data in the pressure sensing system in real time so as to calculate the system opening current and the system closing current in the current state. The controller generates a control signal, namely the control signal is generated by the controller and participates in the operations such as internal calculation, digital triggering and the like of the controller. For ease of illustration, the control signals are depicted outside the controller in FIG. 1. The control signal is a square wave with adjustable frequency and duty ratio. Because the control signal is generated by the controller, the controller can also know the duty ratio, the frequency, the rising edge time and the falling edge time of the control signal in different states and know when the rising edge of the control signal in the next period comes.
The single duty cycle of the solenoid valve is divided into 6 stages, as shown in fig. 2, which are represented by arabic numerals 1-6, respectively. Where 1 represents the preload excitation phase, 2 represents the preload maintenance phase, 3 represents the on phase, 4 represents the maintenance phase, 5 represents the off phase, and 6 represents the off maintenance phase. The end time of the phase 2 coincides with the rising edge time of the control signal, and the end time of the phase 4 coincides with the falling edge time of the control signal.
The controller generates a control signal, and calculates the time required for increasing the coil current to the preload current by adopting the preload excitation voltage according to the current coil current state and the parameters of the coil before the rising edge of the control signal comes, and the time is taken as the duration of the preload excitation stage. Depending on the duration of the preload activation phase, the controller brings the seventh contact into communication with the first contact in advance into phase 1. Under the action of the pre-loaded high voltage source, the coil current will quickly reach the pre-loaded current value. The preload high voltage source (1) voltage is equal to the high voltage source (4) voltage. The preload current is slightly less than the turn-on current.
Since the duration of phase 1 is calculated by the controller from the current coil electrical parameters, the current level reaches exactly the preload opening current when the duration of phase 1 is over. At the moment, the duration time of the phase 1 is over, the controller controls the seventh contact and the second contact to be communicated to enter the phase 2, and under the action of the pre-loading voltage stabilizing source, the current is always maintained in the pre-loading current state reached after the phase 1 is over. The magnitude of the preload voltage stabilization source is equal to the product of the preload turn-on current and the coil resistance.
After the phase 2 is finished, namely when the rising edge of the control signal comes, the controller controls the seventh contact and the third contact to be communicated to enter the phase 3, the current of the coil rapidly rises under the excitation of the high voltage source, as the current is stabilized in a preloading current state slightly lower than the opening current in the preloading phase, the current rises to the opening current in a short time in the phase 3, then the valve core starts to move, and the electromagnetic valve enters the opening phase. The high voltage source continues to maintain, and the maintaining time is equal to the time required by exciting the electromagnetic valve to complete the stroke by adopting the high voltage source under the 0 current state of the electromagnetic valve;
after the stage 3 is finished, the controller controls the seventh contact and the fourth contact to be communicated to enter a stage 4, under the action of the voltage stabilizing source, the current of the coil gradually decreases, and finally the current is stabilized in a maintaining current state which is larger than the set proportion of the closing current, so as to keep the opening state of the electromagnetic valve (the size of the voltage stabilizing source is slightly larger than the product of the closing current and the resistance);
after the stage 4 is finished, the controller controls the seventh contact and the fifth contact to be communicated to enter a stage 5, the current rapidly drops to a closing current under the action of the negative voltage source, the electromagnetic valve starts to be closed at the moment, and the negative voltage source continues to be excited until the current is reduced to 0;
and after the stage 5 is finished, the controller controls the seventh contact and the sixth contact to be communicated to enter a stage 6, and the coil is kept in a zero current state under the action of a zero voltage source until the next period comes.
As shown in fig. 3, which is a schematic diagram of the opening and closing characteristics of a solenoid valve driven by a single voltage of 24V, it can be seen from the figure that the opening of the solenoid valve lags behind 3ms, the opening movement lags behind 2ms, the closing movement lags behind 6.8ms, and the closing movement is 6.1ms after tests.
As shown in fig. 4, which is a schematic diagram of the opening and closing characteristics of the solenoid valve controlled by the system and method of the present invention, in this embodiment, the voltages of the preload high voltage source (1), the preload regulated voltage source (2), the high voltage source (3), the regulated voltage source (4), the negative voltage source (5), and the zero voltage source (6) are 24V, 8V, 24V, 5V, -24V, and 0V, respectively; the test results show that the opening lag is 0.2ms, the opening movement is 1.9ms, the closing lag is 0.1ms and the closing movement is 1.7 ms. As shown in fig. 4, in the pre-loading stage of the present invention, a pre-loading high voltage source is firstly adopted for excitation, so that the coil current is rapidly increased to the pre-loading current, and the time of the pre-loading stage is greatly reduced; the electromagnetic valve can be suitable for the working condition of a higher-frequency electromagnetic valve; when the coil current reaches the pre-loading current (the pre-loading current is less than 5% -10% of the opening current), the coil current is maintained, so that the coil current is stable when the opening command signal arrives, and the opening delay time of the high-speed switch valve is shortened to 0.2ms because the initial current of the opening stage is optimized by the method. When the coil current reaches the opening trigger current value after the high-speed switch valve is opened, the controller switches on the 5V stable voltage source to continuously excite the high-speed switch valve according to the voltage switching mechanism shown in fig. 2. Thus, the coil current gradually drops and eventually stabilizes, providing a smaller initial current for the closing movement of the high speed switching valve. When the closing command signal arrives, the controller switches to a closing voltage of-24V for excitation, and as shown in FIG. 4, under the unloading action of the negative voltage, the current can be rapidly reduced to a 0A current state, and the closing delay process of the high-speed switch valve is shortened.
Claims (10)
1. A control system for realizing rapid movement of an electromagnetic valve is characterized by comprising a pre-loading high-voltage source (1), a pre-loading voltage stabilizing source (2), a high-voltage source (3), a voltage stabilizing source (4), a negative voltage source (5), a zero-voltage source (6), a high-speed switch (7), a current detector (8), a pressure sensing system (10) and a controller (11);
the high-speed switch (7) is provided with seven contacts, wherein a first contact (7-1) is connected with a pre-loading high-voltage source (1), a second contact (7-2) is connected with a pre-loading stable-voltage source (2), a third contact (7-3) is connected with a high-voltage source (3), a fourth contact (7-4) is connected with a stable-voltage source (4), a fifth contact (7-5) is connected with a negative-voltage source (5), a sixth contact (7-6) is connected with a zero-voltage source (6), and a seventh contact (7-7) is connected with a current detector (8); the current detector (8) is connected with a coil of the electromagnetic valve, and the pressure sensing system is connected with each working port of the electromagnetic valve and is used for obtaining the pressure state of each working port of the electromagnetic valve; the controller (11) is connected with the pressure sensing system, and the controller (11) comprises a control signal generating unit; and the output port of the controller (11) is connected with the high-speed switch and can control the contact state of the seventh contact (7-7) and the rest 6 contacts.
2. The control system for realizing the rapid movement of the electromagnetic valve according to claim 1, wherein the control signal generated by the control signal generating unit is a square wave signal, and the duty ratio of the square wave signal is the target opening time and the cycle time ratio of the electromagnetic valve.
3. The control system for realizing the rapid motion of the electromagnetic valve according to the claim 1, characterized in that the controller (11) obtains the duty ratio, the frequency, the rising edge time and the falling edge time of the control signal generated by the control signal generating unit in real time.
4. A method of controlling the system of claim 1, comprising the steps of:
the controller generates a control signal, calculates the time required for increasing the coil current to the pre-loading current by adopting the pre-loading excitation voltage according to the current coil current state and the coil parameters before the rising edge of the control signal comes, and takes the time as the duration of the pre-loading excitation stage; according to the duration of the preloading excitation stage, the controller enables the seventh contact head and the first contact head to be communicated in advance to enter the preloading excitation stage; under the action of the preloading high voltage source, the current of the coil reaches a preloading current value;
the controller controls the seventh contact and the second contact to be communicated to enter a preloading maintaining stage, and the current is always maintained in a preloading current state under the action of the preloading voltage stabilizing source;
when the rising edge of the control signal comes, the controller controls the seventh contact head and the third contact head to be communicated to enter an opening stage, the current of the coil is rapidly increased under the excitation of a high-voltage source, then the valve core starts to move, and the electromagnetic valve enters an opening stage; the high voltage source continues to be maintained until full opening of the solenoid valve is ensured;
the controller controls the seventh contact and the fourth contact to be communicated to enter a maintaining stage, the current of the coil gradually decreases under the action of the voltage stabilizing source, and finally the coil is stabilized in a maintaining current state which is larger than the set proportion of the closing current so as to keep the opening state of the electromagnetic valve;
when the falling edge of the control signal comes, the controller controls the seventh contact and the fifth contact to be communicated to enter a closing stage, the current rapidly drops to a closing current under the action of the negative voltage source, the electromagnetic valve starts to be closed at the moment, and the negative voltage source continues to be excited until the current is reduced to 0;
and the controller controls the seventh contact and the sixth contact to be communicated to enter a closing maintenance stage, and the coil is kept in a zero current state under the action of a zero voltage source until the next period.
5. Control method according to claim 4, characterized in that the preload high voltage source (1) voltage is equal to the high voltage source (4) voltage and the preload current is smaller than the turn-on current set proportion.
6. The control method of claim 4, wherein the magnitude of the preload regulation voltage source is equal to the product of the preload turn-on current and the coil resistance.
7. The control method of claim 4, wherein the regulated voltage source has a voltage value greater than the product of the solenoid coil resistance and the closing current.
8. The control method according to claim 4, characterized in that the calculation of the duration of the pre-loading excitation phase is carried out by: the controller calculates the time required for the coil current to rise to the preload current as the duration of the preload excitation phase based on the current solenoid current, coil resistance and inductance.
9. The control method according to claim 4, characterized in that the duration of the preload maintenance phase is 1-2 ms.
10. A control method according to claim 4, characterized in that the duration of said opening phase is equal to the time required for the solenoid to be energized with said high voltage source in the 0 current condition until the solenoid is fully open.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114483698A (en) * | 2022-02-28 | 2022-05-13 | 浙江工业大学 | High-dynamic flexible closing control method for electromagnetic valves with different strokes |
| CN114483698B (en) * | 2022-02-28 | 2024-05-17 | 浙江工业大学 | High-dynamic flexible closing control method for solenoid valves with different strokes |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114483698A (en) * | 2022-02-28 | 2022-05-13 | 浙江工业大学 | High-dynamic flexible closing control method for electromagnetic valves with different strokes |
| CN114483698B (en) * | 2022-02-28 | 2024-05-17 | 浙江工业大学 | High-dynamic flexible closing control method for solenoid valves with different strokes |
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| CN111828715B (en) | 2023-04-07 |
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