CN111810700B - A solenoid valve high dynamic and high frequency response control system and method thereof - Google Patents
A solenoid valve high dynamic and high frequency response control system and method thereof Download PDFInfo
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- CN111810700B CN111810700B CN202010014362.1A CN202010014362A CN111810700B CN 111810700 B CN111810700 B CN 111810700B CN 202010014362 A CN202010014362 A CN 202010014362A CN 111810700 B CN111810700 B CN 111810700B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0675—Electromagnet aspects, e.g. electric supply therefor
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Abstract
本发明公开了一种电磁阀高动态高频响控制系统及其方法。系统包括预加载高电压源、预加载稳电压源、高电压源、反向电压源、稳电压源、负电压源、零电压源、高速切换开关、电流检测器、电磁阀、压力传感系统和控制器；通过在电磁阀预期启闭时刻前，提前加载预加载高电压源，并通过预加载稳电压源使线圈电流保持在一个略小于开启电流的状态。在开启阶段，采用高电压源激励，使电流快速上升，减小了开启阶段的运动时间；在维持阶段前采用了反向电压源激励，能更快的将线圈电流从开启电流下降到维持电流；在关闭阶段，采用负电压源激励，使电流快速下降到0，减小了关闭阶段的运动时间。
The present invention discloses a high-dynamic and high-frequency response control system for a solenoid valve and a method thereof. The system includes a preloaded high voltage source, a preloaded regulated voltage source, a high voltage source, a reverse voltage source, a regulated voltage source, a negative voltage source, a zero voltage source, a high-speed switching switch, a current detector, a solenoid valve, a pressure sensing system and a controller; the preloaded high voltage source is preloaded before the expected opening and closing time of the solenoid valve, and the coil current is maintained in a state slightly less than the opening current by the preloaded regulated voltage source. In the opening stage, a high voltage source is used for excitation, so that the current rises rapidly, reducing the movement time of the opening stage; a reverse voltage source is used for excitation before the maintenance stage, which can more quickly reduce the coil current from the opening current to the maintenance current; in the closing stage, a negative voltage source is used for excitation, so that the current drops rapidly to 0, reducing the movement time of the closing stage.
Description
Technical Field
The invention relates to the field of electromagnetic valve control, in particular to a high-dynamic high-frequency response control system and a high-dynamic high-frequency response control method for an electromagnetic valve.
Background
Among solenoid valves, ampere-turns and working air gaps have the greatest influence on the electromagnetic force of the solenoid. Ampere-turns is the product of the number of turns of the coil and the current in a single turn of the coil. The larger the current, the larger the electromagnetic force, and the smaller the working air gap, the larger the electromagnetic force, under the condition that the magnetic flux is not saturated. Because the solenoid valve is often when the working air gap in the electromagnet is the biggest when opening, and is often when the working air gap in the electromagnet is the minimum when closing, consequently open current is bigger than 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, and simultaneously the electromagnetic force generated by the current also increases, when the electromagnetic force increases enough to overcome the working resistance of the electromagnetic valve, the electromagnetic valve is opened, after the driving voltage is closed, the current in the circuit decreases, and simultaneously the electromagnetic force decreases along with the opening of the electromagnetic valve, and when the electromagnetic force decreases 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 there is a high demand for a dynamic response to the solenoid valve. Because of the inductive effect of the electromagnet and coil, a certain hysteresis is created at both the valve opening and closing moments. If a smaller driving voltage is adopted, the current rising speed is slow in the opening stage, which causes longer opening lag time, and if a larger driving voltage is adopted, the initial current is large in closing, which causes longer closing lag time. Therefore, the single voltage source control mode cannot shorten the solenoid valve lag time when opening and closing simultaneously.
In the prior art, a 3-voltage source control mode is adopted in the field of high-frequency electromagnetic valves to achieve a high-frequency control function, a high-voltage source is adopted as an excitation voltage in the patent [ CN201610015304.4] to enable the electromagnetic valve to be opened in a short time, a stabilized voltage supply provides a maintenance voltage to enable current to be kept at a value slightly larger than a closing current, and a negative voltage source provides a larger reverse voltage to enable the current to be reduced to the closing current in a short time. The effect of shortening the lag time of the electromagnetic valve when the electromagnetic valve is opened and closed is achieved.
However, the existing 3-voltage source control (patent [ CN 201610015304.4) mode divides only one period into four phases, so as to achieve the effects of shortening the period time and increasing the operating frequency of the electromagnetic valve, but does not optimize each phase further. Certain measures can be taken in the opening, maintaining and closing stages of the electromagnetic valve, so that the time consumption of each stage is shortened, and the working frequency of the high-frequency electromagnetic valve can be greatly improved.
Disclosure of Invention
In order to solve the above-mentioned difficulties, the present invention provides a high-dynamic high-frequency response control system and method for electromagnetic valve.
The invention discloses a solenoid valve high-dynamic high-frequency response control system which comprises a pre-loaded high-voltage source, a pre-loaded stable-voltage source, a high-voltage source, a reverse-voltage source, a stable-voltage source, a negative-voltage source, a zero-voltage source, a high-speed change-over switch, a current detector, a solenoid valve, a pressure sensing system and a controller, wherein the pre-loaded high-voltage source is connected with the high-voltage source;
The high-speed change-over switch comprises eight contacts, wherein a first contact is connected with a preloaded high-voltage source, a second contact is connected with a preloaded stable-voltage source, a third contact is connected with the high-voltage source, a fourth contact is connected with a reverse voltage source, a fifth contact is connected with the stable-voltage source, a sixth contact is connected with a negative-voltage source, a seventh contact is connected with a zero-voltage source, an eighth contact is connected with a current detector, the current detector is connected with a coil of an electromagnetic valve, a pressure sensing system is connected with the electromagnetic valve to obtain the pressure state of each working port of the electromagnetic valve in real time, a controller is connected with the pressure sensing system, the controller comprises a control signal generating unit, and an output port of the controller is connected with the high-speed change-over switch and can control the contact states of the eighth contact and the rest 7 contacts.
As a preferable scheme of the invention, 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. The rising edge of the control signal indicates that the operator desires the solenoid valve to be open, the high level of the control signal indicates that the operator desires the solenoid valve to be open, the falling edge of the control signal indicates that the operator desires the solenoid valve to be closed, and the low level of the control signal indicates that the operator desires the solenoid valve to be closed.
As a preferable mode of the present invention, the controller 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 invention also discloses a control method of the system, which comprises the following steps:
The controller generates a control signal, and before the rising edge of the control signal comes, the controller calculates the time required for increasing the coil current to the preloaded current by adopting the preloaded excitation voltage according to the current state of the coil and the parameters of the coil, and takes the time as the duration of the preloaded excitation stage;
after the pre-loading current value is reached, the controller controls the eighth contact to be communicated with the second contact to enter a pre-loading maintaining stage, and the current is always maintained in a pre-loading current state under the action of a pre-loading stable voltage source;
When the rising edge of the control signal comes, the controller controls the eighth contact to be communicated with the third contact to enter an opening stage, the current of the coil rises rapidly under the excitation of a high-voltage source, and then the valve core starts to move, and the electromagnetic valve enters the opening stage;
The controller calculates the time required for the coil current to drop from the opening current after the opening phase to the maintaining current under the action of a reverse voltage source according to the coil parameters and the current coil current, wherein the time is the duration time of the reverse excitation phase;
Then the controller controls the eighth contact to be communicated with the fifth contact to enter a maintenance stage, and under the action of a stable voltage source, the coil current is always stabilized in a maintenance current state so as to keep the electromagnetic valve in an opening state;
When the falling edge of the control signal arrives, the controller controls the eighth contact to be communicated with the sixth contact to enter a closing stage, under the action of the negative voltage source, the current rapidly drops to the closing current, at the moment, the electromagnetic valve starts to be closed, and the negative voltage source continues to be excited until the current drops to 0;
The controller controls the eighth contact to be communicated with the seventh contact to enter a closing maintenance stage, and under the action of a zero voltage source, the coil always maintains a zero current state until the next period comes.
As a preferable scheme of the invention, the pre-loaded high voltage source voltage is equal to the high voltage source voltage, and the pre-loaded current is smaller than the set proportion of the starting current.
As a preferred embodiment of the present invention, the magnitude of the pre-load regulated voltage source is equal to the product of the pre-load on current and the coil resistance.
As a preferred embodiment of the invention, the voltage value of the regulated voltage source is greater than the product of the solenoid resistance and the closing current.
As a preferable scheme of the invention, the magnitude of the reverse voltage source is the same as that of the high voltage source, and the current direction is opposite.
The method is characterized in that the controller calculates the time required for the coil current to rise to the pre-loading current according to the current solenoid current, the coil resistance and the inductance as the duration of the pre-loading excitation phase.
As a preferable scheme of the invention, the duration of the pre-loading maintaining stage is 1-2 ms;
as a preferred embodiment of the invention, the duration of the opening phase is equal to the time required for the solenoid valve to be energized to fully open in the 0 current state using the high voltage source.
The invention has the beneficial effects that:
(1) The pre-loading stage (comprising a pre-loading excitation stage and a pre-loading maintenance stage) adopts two-stage voltage source excitation, namely, a pre-loading high-voltage source is used for excitation first, so that the coil current is quickly increased to a pre-loading current value. And maintaining the current in a preloaded current state by using a preloaded stable voltage source. The conventional method is used for realizing the function of preloading current, and is usually to perform preloading excitation by adopting a single voltage, and since the preloading current is a relatively fixed value, in combination with the current resistance situation, the corresponding preloading voltage is also relatively fixed, and the magnitude of the preloading voltage is equal to the product of the preloading current and the resistance. The pre-load voltage in the traditional method is smaller than the pre-load excitation voltage in the invention, so that the current increases slowly under the action of the pre-load voltage, the time required for increasing the current to the pre-load current is longer, and the whole pre-load process is prolonged. Therefore, for some high-frequency switch occasions, the method of preloading by adopting a single voltage source cannot meet the requirement of opening and closing at a higher frequency. Moreover, with the change of the duty cycle, when the on duty cycle is large, the time left for the on pre-load phase is reduced, and when the time is reduced to a point where the current cannot be increased to the pre-load current, the effect of the pre-load phase is further reduced. Thus, the method of preloading with a single voltage has a number of limitations. Compared with a control mode that only one section of voltage source is used in the pre-loading stage, the method has the advantages that the current rising rate is higher due to the fact that the high voltage source is adopted for excitation, the current rises to the pre-loading current state faster, and the time consumption in the pre-loading 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 the opening stage only in a short time, and then the electromagnetic valve is opened, so that the dynamic characteristic of the electromagnetic valve in the opening stage is better, and the lag time of the electromagnetic valve in the opening stage is shortened.
(3) The reverse excitation stage adopts a reverse voltage source for excitation, and can quickly reduce the coil current from the starting current after the starting stage is finished to the maintaining current, so that the acting time of the stable voltage source in the prior art is greatly shortened. In the prior art, the stable voltage source is adopted for excitation, so that the current is finally stabilized in a state slightly larger than the closed current, but the stable voltage source is adopted for direct excitation, and the time required for the current to drop to the maintenance current is long. If the control signal frequency is high, it is possible that the current has not been reduced to the holding current, and the control signal falling edge has come, which would be detrimental to further optimization of the solenoid valve dynamics. The invention adopts the reverse voltage in the reverse excitation stage and the sustain voltage in the sustain stage, so that the current can be quickly reduced to the sustain current by utilizing the unloading characteristic of the reverse voltage, and then the current is always kept in the state of the sustain current by the sustain voltage in the sustain stage. Compared with the prior art, the electromagnetic valve is immediately connected with the reverse voltage after the high-voltage excitation is finished (namely, the electromagnetic valve is considered to be completely opened), so that the current is quickly reduced to the maintenance current, the average current in the working period is reduced, the electromagnetic energy consumption is reduced, and the electromagnetic valve can adapt to better opening and closing working conditions.
(4) The duration of the opening phase is defined in this patent as the time required for the solenoid valve to be energized to complete its stroke by the high voltage source in the 0-current state.
In general, electromagnetic valves have relatively weak dynamic characteristics, while electromagnetic coils have relatively good current dynamic characteristics. In the prior art, as in patent CN201610015304.4, the high voltage source is switched to the lower regulated voltage source immediately after the current is increased to the on current, which results in the valve still being in an on motion state and not completing the stroke when the coil current reaches the on current due to the weak solenoid valve dynamics and the good solenoid current dynamics. At this time, the high voltage source is immediately switched into the stable voltage source, so that the driving force of the electromagnetic valve in the opening stage is reduced, and the dynamic characteristic of the electromagnetic valve in the opening stage is reduced. In this patent, the duration of stage 3 is defined as the time required for the solenoid valve to be energized to complete its stroke by the high voltage source at 0 current. Because, if the valve is fully opened by the high voltage instead of the actuation in the 0 current state, the same actuation time must be sufficient to fully open the valve if a certain preload current is already present (the high voltage actuation is continued for this time, which ensures the dynamic characteristics of the opening phase to the greatest extent).
(5) In the prior art, such as in patent CN201610015304.4, during the closing phase of the solenoid valve, the current is reduced to a closing current by a negative voltage and then immediately switched to zero voltage. The method has the defects that when the dynamic characteristics of part of the switch valve are weak and the current dynamic characteristics of the electromagnetic coil are good, when the current drops to the closing current, the valve is in the closing motion state, and at the moment, the negative voltage is switched to zero voltage, so that the driving force of the closing stage of the electromagnetic valve is reduced, and the dynamic characteristics of the valve in the closing stage are reduced. In the closing stage of the invention, the negative voltage source excitation is adopted to directly reduce the current to 0, and the electromagnetic force generated when the current is 0 is minimum, so that the driving force in the closing process is always kept at the maximum value, and the valve is closed most quickly.
(6) The multi-voltage source control mode enables the time that the voltage is in a high position in one period to be greatly shortened, the heating of the coil can be reduced to the greatest extent, and the service life of equipment is prolonged.
Drawings
FIG. 1 is a schematic diagram of the high dynamic control system of the 7 voltage source solenoid valve of the present invention;
FIG. 2 is a graph of control signals and current according to the present invention;
FIG. 3 is a diagram showing the on-off characteristics of a single voltage driven solenoid valve;
FIG. 4 is a schematic illustration of the opening and closing characteristics of a solenoid valve driven by the system and method of the present invention;
Fig. 5 is a characteristic of opening and closing the solenoid valve of the comparative example including no reverse voltage source.
Detailed Description
The invention is further described below with reference to the drawings and specific examples.
As shown in fig. 1, the system of the present embodiment includes a preloaded high voltage source 1, a preloaded regulated voltage source 2, a high voltage source 3, a reverse voltage source 4, a regulated voltage source 5, a negative voltage source 6, a zero voltage source 7, a high speed change-over switch 8, a current detector 9, a solenoid valve 10, a pressure sensing system 11, and a controller 12;
the controller 12 includes a control signal generating unit, the control signal 13 is programmed and generated by an operator through the control signal generating unit inside the controller, and the control signal participates in the internal operation of the controller. The controller 12 acquires the duty ratio, the frequency, the rising edge timing, and the falling edge timing of the control signal generated by the control signal generating unit in real time.
The high-speed change-over switch 8 comprises eight contacts, wherein a first contact 8-1 is connected with a preloaded high-voltage source 1, a second contact 8-2 is connected with a preloaded stable-voltage source 2, a third contact 8-3 is connected with the high-voltage source 3, a fourth contact 8-4 is connected with a reverse voltage source 4, a fifth contact 8-5 is connected with the stable-voltage source 5, a sixth contact 8-6 is connected with a negative voltage source 6, a seventh contact 8-7 is connected with a zero-voltage source 7, an eighth contact 8-8 is connected with a current detector 9, the current detector 9 is connected with a coil of an electromagnetic valve 10, a pressure sensing system 11 is connected with the electromagnetic valve to obtain the pressure state of each working port of the electromagnetic valve in real time, a controller 12 is connected with the pressure sensing system, the controller 12 comprises a control signal generating unit, and an output port of the controller 12 is connected with the high-speed change-over switch and can control the contact states of the eighth contact 8-8 with the other 7 contacts.
The controller obtains data in the pressure sensing system in real time, so that the system opening current and closing current in the current state are calculated. The controller generates control signals, namely the control signals are generated by the controller and participate in the internal calculation of the controller, digital triggering and other operations. For ease of illustration, the control signals are drawn outside the controller in fig. 1. The control signal is a square wave with adjustable frequency and duty cycle. Since the control signal is generated by the controller itself, 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 7 stages, as shown in fig. 2, respectively designated by the arabic numerals 1-7. Wherein 1 represents a preload-excitation phase, 2 represents a preload-sustain phase, 3 represents an on phase, 4 represents an inverse excitation phase, 5 represents a sustain phase, 6 represents an off phase, and 7 represents an off sustain phase. The end time of the stage 2 coincides with the rising edge time of the control signal, and the end time of the stage 5 coincides with the falling edge of the control signal.
The controller generates a control signal, and before the rising edge of the control signal comes, the controller calculates the time required for increasing the coil current to the preloaded current by adopting the preloaded exciting voltage according to the current coil current state and the parameters of the coil, and takes the time as the duration of the preloaded exciting stage. The controller communicates the eighth contact with the first contact in advance into phase 1, depending on the duration of the preload activation phase. Under the action of the preloaded high voltage source, the coil current will quickly reach the preloaded current value. The preloaded high voltage source 1 voltage is equal to the high voltage source 3 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's electrical parameters, the current level just reaches the pre-load on current when the duration of phase 1 ends. At this time, the duration of the stage 1 is over, the controller controls the eighth contact to communicate with the second contact to enter the stage 2, and the current is always maintained in the preloaded current state reached after the stage 1 is over under the action of the preloaded voltage stabilizing source. The voltage of the pre-load voltage stabilizing source is equal to the product of the pre-load starting current and the coil resistance.
After the stage 2 is finished, that is, when the rising edge of the control signal comes, the controller controls the eighth contact to be communicated with the third contact to enter a stage 3, the current rises rapidly under the excitation of a high voltage source, and the current in the stage 3 rises to the opening current in a very short time because the current is stabilized in a pre-loading current state slightly lower than the opening current in the pre-loading stage, and then the valve core starts to move, so that the electromagnetic valve enters the opening stage. The high voltage source is continuously maintained, the maintaining time is equal to the time required for the electromagnetic valve to be excited by the high voltage source to complete the stroke under the state of 0 current;
After the stage 3 is finished, the controller controls the eighth contact to be communicated with the fourth contact to enter a stage 4, and the controller calculates the time required for the coil current to drop from the starting current to the maintaining current (the maintaining current is slightly larger than the closing current) after the stage 3 is finished under the action of a reverse voltage source according to the current coil parameters and the coil current, wherein the time is the duration of the stage 4.
Under the action of a reverse voltage source, the coil current is rapidly reduced, and the current is reduced to a maintenance current state at the end of the stage 4 so as to keep the opening state of the electromagnetic valve;
after the end of the phase 4, the controller controls the eighth contact to be communicated with the fifth contact to enter the phase 5, because the duration of the phase 4 is calculated by the controller according to the electrical parameters of the current coil, when the duration of the phase 4 is ended, the current just reaches the maintaining current. Under the action of a stable voltage source, the coil current is always stabilized in a current state after the end of the stage 4 so as to ensure that the electromagnetic valve is continuously in a closed state;
after the stage 5 is finished, namely the moment when the falling edge of the control signal arrives, the controller controls the eighth contact to be communicated with the sixth contact to enter a stage 6, under the action of the negative voltage source, the current rapidly drops to the closing current, the electromagnetic valve starts to be closed at the moment, the negative voltage source continues to be excited until the current is reduced to 0, and the stage 6 is finished at the moment;
After the stage 6 is finished, the controller controls the eighth contact to be communicated with the seventh contact to enter a stage 7, the coil is kept in a zero current state all the time under the action of a zero voltage source until the stage 1 of the next period comes, and the system repeats the process;
the voltage value of the pre-loaded voltage stabilizing source is slightly smaller than the product of the solenoid valve coil resistance and the opening current, and is generally smaller than 5% -10% of the product of the solenoid valve coil resistance and the opening current, namely the pre-loaded voltage stabilizing source is adopted for excitation, when the current is stable, the current is smaller than 5% -10% of the opening current, namely the pre-loaded current, the voltage value of the voltage stabilizing source is slightly larger than the product of the solenoid valve coil resistance and the closing current, and is generally larger than 5% -10% of the product of the solenoid valve coil resistance and the closing current, namely the voltage stabilizing source is adopted for excitation, and when the current is stable, the current is larger than 5% -10% of the closing current, namely the maintaining current.
The calculation process of the duration time required by the preloading excitation stage (stage 1) in the scheme comprises the steps that 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 electromagnetic valve current, the line inductance resistance and the inductance, and the time is used as the duration time of the stage 1;
The duration time required by the pre-loading maintaining stage (stage 2) in the scheme is generally 1-2 ms, and can be appropriately increased or decreased according to different working conditions;
The calculation process of the duration time required by the opening stage (stage 3) in the scheme is that the duration time of the high voltage is equal to the duration time required by the electromagnetic valve to complete the stroke when the electromagnetic valve is excited by the high voltage source in the 0-current state, namely the duration time of the stage 3, and the starting time of the stage 3 is the rising edge arrival time of the control signal. According to the rising edge arrival time of the control signal and the duration of the phase 1 and the phase 2, the controller automatically calculates the starting and ending time of the phase 1 and the phase 2.
The duration required for the reverse excitation phase (phase 4) in the scheme is calculated by the time required for the coil current after the end of phase 3 to drop to the holding current upon excitation of the reverse voltage source.
The duration required for the maintenance phase (phase 5) in the scheme is calculated by the duration from the end time of phase 4 to the arrival time of the falling edge of the control signal.
The duration required for the shutdown phase (phase 6) in the described scheme is calculated as the time required for the sustain current after phase 5 ends to drop to 0 current at the negative voltage source excitation.
The duration required for closing the maintenance phase (phase 7) in the solution is calculated as the duration from the end of phase 6 to the start of the next phase 1.
As shown in fig. 3, the opening and closing characteristics of the solenoid valve driven by 24V single voltage are shown, and it can be seen from the graph that the solenoid valve is tested to have 3ms of opening lag, 2ms of opening movement, 6.8ms of closing lag and 6.1ms of closing movement.
In this embodiment, the voltages of the high voltage source 1, the pre-load voltage stabilizing source 2, the high voltage source 3, the reverse voltage source 4, the voltage stabilizing source 5, the negative voltage source 6 and the zero voltage source 7 are respectively 24V,8V,24V, -24V,5V, -24V,0V, and the opening lag is 0.2ms, the opening lag is 1.9ms, the closing lag is 0.1ms and the closing lag is 1.7ms. As shown in fig. 4, the coil current of the present invention is stabilized in the pre-load current stage when the on command signal arrives, and in the on stage, the high voltage excitation time is set to be equal to the time required for the electromagnetic valve to be excited by the high voltage source until the stroke is completed in the 0 current state of the electromagnetic valve, so as to ensure that the electromagnetic valve is completely opened. In the reverse excitation stage, a voltage value equal to a high-voltage source reverse voltage source is adopted, so that the coil current is quickly reduced to the maintenance current, the average current in a working period is reduced, the electromagnetic energy consumption is reduced, and the electromagnetic valve can adapt to better opening and closing working conditions.
A comparative example, which operates similarly to the present application but does not include a reverse excitation stage, is shown in fig. 5 without the reverse excitation stage. The voltage sources of the comparative example comprise a pre-loaded high voltage source, a pre-loaded stable voltage source, a high voltage source, a stable voltage source, a negative voltage source and a zero voltage source, and the voltages are respectively 24V,8V,24V,5V, -24V and 0V. As can be seen from the comparison between FIG. 4 and FIG. 5, the present application can greatly reduce the time for reducing the coil current to the sustaining current by adding the reverse voltage source 4, and can be better applied to the occasion with higher control signal frequency.
Claims (10)
1. The electromagnetic valve high-dynamic high-frequency response control system is characterized by comprising a preloaded high-voltage source (1), a preloaded stable-voltage source (2), a high-voltage source (3), a reverse-voltage source (4), a stable-voltage source (5), a negative-voltage source (6), a zero-voltage source (7), a high-speed change-over switch (8), a current detector (9), an electromagnetic valve (10), a pressure sensing system (11) and a controller (12);
The high-speed change-over switch (8) comprises eight contact heads, wherein a first contact head (8-1) is connected with a preloaded high-voltage source (1), a second contact head (8-2) is connected with a preloaded stable-voltage source (2), a third contact head (8-3) is connected with the high-voltage source (3), a fourth contact head (8-4) is connected with a reverse-voltage source (4), a fifth contact head (8-5) is connected with a stable-voltage source (5), a sixth contact head (8-6) is connected with a negative-voltage source (6), a seventh contact head (8-7) is connected with a zero-voltage source (7), an eighth contact head (8-8) is connected with a current detector (9), the current detector (9) is connected with a coil of an electromagnetic valve (10), a pressure sensing system (11) is connected with the electromagnetic valve to obtain the pressure state of each working port of the electromagnetic valve in real time, a controller (12) is connected with the pressure sensing system, the controller (12) comprises a control signal generating unit, and an output port of the controller (12) is connected with the high-speed change-over switch (8) and can control the state of the eighth contact head (8-8).
2. The electromagnetic valve high-dynamic high-frequency response control system 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 electromagnetic valve high-dynamic high-frequency response control system according to claim 1, wherein the controller (12) 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.
4. A control method of the electromagnetic valve high-dynamic high-frequency response control system according to claim 1, characterized by comprising the steps of:
The controller generates a control signal, and before the rising edge of the control signal comes, the controller calculates the time required for increasing the coil current to the preloaded current by adopting the preloaded excitation voltage according to the current state of the coil and the parameters of the coil, and takes the time as the duration of the preloaded excitation stage;
after the pre-loading current value is reached, the controller controls the eighth contact to be communicated with the second contact to enter a pre-loading maintaining stage, and the current is always maintained in a pre-loading current state under the action of a pre-loading stable voltage source;
When the rising edge of the control signal comes, the controller controls the eighth contact to be communicated with the third contact to enter an opening stage, the current of the coil rises rapidly under the excitation of a high-voltage source, and then the valve core starts to move, and the electromagnetic valve enters the opening stage;
The controller calculates the time required for the coil current to drop from the current after the end of the opening phase to the maintaining current under the action of a reverse voltage source according to the coil parameters and the current coil current, wherein the time is the duration time of the reverse excitation phase;
Then the controller controls the eighth contact to be communicated with the fifth contact to enter a maintenance stage, and under the action of a stable voltage source, the coil current is always stabilized in a maintenance current state so as to keep the electromagnetic valve in an opening state;
When the falling edge of the control signal arrives, the controller controls the eighth contact to be communicated with the sixth contact to enter a closing stage, under the action of the negative voltage source, the current rapidly drops to the closing current, at the moment, the electromagnetic valve starts to be closed, and the negative voltage source continues to be excited until the current drops to 0;
The controller controls the eighth contact to be communicated with the seventh contact to enter a closing maintenance stage, and under the action of a zero voltage source, the coil always maintains a zero current state until the next period comes.
5. The control method according to claim 4, characterized in that the pre-load high voltage source (1) voltage is equal to the high voltage source (3) voltage, the pre-load current being smaller than the on-current setting ratio.
6. The control method of claim 4, wherein the magnitude of the pre-load regulated voltage source is equal to the product of the pre-load on current and the coil resistance.
7. The control method of claim 4, wherein the voltage value of the regulated voltage source is greater than the product of solenoid resistance and closing current.
8. The control method of claim 4, wherein the duration of the preload actuator stage is calculated by the controller based on the present solenoid current, the coil resistance, and the inductance, and calculating the time required for the coil current to rise to the preload current as the duration of the preload actuator stage.
9. The control method according to claim 4, characterized in that the duration of the preload maintenance stage is 1-2 ms.
10. The control method according to claim 4, wherein the duration of the opening phase is equal to the time required for the solenoid valve to be energized to fully open at 0 current using the high voltage source.
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| CN113898778B (en) * | 2021-09-29 | 2023-03-21 | 福州慧邦机械设备有限公司 | High-speed electromagnetic valve control system and method adapting to working condition and control parameter change |
| CN114483698B (en) * | 2022-02-28 | 2024-05-17 | 浙江工业大学 | A high dynamic flexible closing control method for solenoid valves with different strokes |
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