CN115949579A - Constant-pressure control method, device, equipment and medium for variable-frequency air compressor - Google Patents
Constant-pressure control method, device, equipment and medium for variable-frequency air compressor Download PDFInfo
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Abstract
The application discloses constant voltage control method, device, equipment and medium of frequency conversion air compressor machine belongs to frequency conversion air compressor machine technical field, and the method includes: detecting the operating pressure value of the variable-frequency air compressor in real time, if the operating pressure value is greater than or equal to a first preset threshold value, dynamically setting a target pressure value according to the first preset threshold value and a set pressure value, meanwhile, carrying out constant-pressure control on the variable-frequency air compressor according to a PID algorithm and a target pressure value on the basis of the principle that the target pressure value gradually approaches the set pressure value along with the change of the adjusting time; and when the operation pressure value is greater than or equal to the sum of the unloading pressure value and a third preset threshold value, or the duration of the operation pressure value is greater than or equal to the unloading pressure value and is greater than or equal to the preset delay duration, carrying out pressure unloading on the variable-frequency air compressor. The method can ensure the stable and reliable operation of the variable frequency air compressor and can also ensure that the variable frequency air compressor can quickly enter a constant pressure operation state.
Description
Technical Field
The invention relates to the technical field of variable frequency air compressors, in particular to a constant pressure control method, a constant pressure control device, constant pressure control equipment and a constant pressure control medium for a variable frequency air compressor.
Background
The inverter air compressor generally comprises an air compressor, a pressure sensor, an inverter and a control panel. The existing variable frequency air compressor can realize constant pressure control of the variable frequency air compressor by directly adopting a PID (proportional Integral derivative) function of the frequency converter, and can meet the application requirements of most users. The reason is that the pressure difference of most variable frequency air compressors is relatively large, and the pressure difference refers to the difference between the set pressure value and the unloading pressure value of the variable frequency air compressors. The set pressure value is the pressure value that the variable frequency air compressor will reach finally, and the uninstallation pressure value is the upper limit value of variable frequency air compressor operating pressure, and in case the operating pressure value of variable frequency air compressor reaches the uninstallation pressure value, the variable frequency air compressor will adjust valve, automatic uninstallation pressure to avoid the gas pitcher pressure among the variable frequency air compressor machine too high and produce the explosion.
However, in practical applications, there are some application scenarios with small pressure difference, such as: the set pressure value of the variable frequency air compressor is 0.78Mpa, the unloading pressure value is 0.80Mpa, and the differential pressure of the variable frequency air compressor is only 0.02Mpa, so that the variable frequency air compressor can reach the unloading pressure point in the process of executing PID (proportion integration differentiation) adjustment once the variable frequency air compressor has 0.02Mpa overshoot, and the variable frequency air compressor is subjected to pressure unloading. When the operating pressure value of the variable-frequency air compressor is reduced to the loading pressure point, the variable-frequency air compressor can reload pressure. After the frequency conversion air compressor machine reloads pressure, in case the overshoot of frequency conversion air compressor machine surpasses frequency conversion air compressor machine set pressure value 0.02Mpa and above, then frequency conversion air compressor machine will make a round trip to adjust between uninstallation pressure point and loading pressure point, can't reach steady state. In the prior art, although overshoot of the variable frequency air compressor can be suppressed to a certain extent by adjusting a differential link of the PID, and the variable frequency air compressor cannot trigger an unloading pressure point of the variable frequency air compressor when the PID adjustment is executed, the method can cause slow dynamic response of the variable frequency air compressor, and cannot meet application requirements of users. At present, no effective solution exists for the above technical problems.
Therefore, how to ensure the stable and reliable operation of the variable frequency air compressor and ensure that the variable frequency air compressor can quickly enter a constant-pressure operation state is a technical problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method, an apparatus, a device and a medium for constant pressure control of an inverter air compressor, so as to ensure that the inverter air compressor can reach a stable operation state and can also be ensured to rapidly enter a constant pressure operation state. The specific scheme is as follows:
a constant pressure control method of a variable frequency air compressor comprises the following steps:
detecting an operating pressure value of the variable-frequency air compressor in real time, and judging whether the operating pressure value is greater than or equal to a first preset threshold value or not; the difference value between the set pressure value and the unloading pressure value of the variable-frequency air compressor is smaller than a second preset threshold value; the first preset threshold value is larger than a loading pressure value of the variable-frequency air compressor;
if the operating pressure value is greater than or equal to the first preset threshold value, dynamically setting a target pressure value according to the first preset threshold value and the set pressure value, and meanwhile, performing constant-pressure control on the variable-frequency air compressor according to a PID algorithm and the target pressure value on the basis of the principle that the target pressure value gradually approaches the set pressure value along with the change of the adjusting time;
and when the operation pressure value is greater than or equal to the sum of the unloading pressure value and a third preset threshold value, or the duration of the operation pressure value is greater than or equal to the unloading pressure value and is greater than or equal to a preset delay duration, carrying out pressure unloading on the variable-frequency air compressor.
Preferably, the step of dynamically setting a target pressure value according to the first preset threshold and the set pressure value, and performing constant pressure control on the variable-frequency air compressor according to a PID algorithm and the target pressure value based on a principle that the target pressure value gradually approaches the set pressure value along with the change of the adjustment time includes:
setting a pressure increment according to a difference value between the first preset threshold value and the set pressure value;
setting the target pressure value according to a target model and the pressure increment by taking i equal to 1 as an initial value, performing constant pressure control on the variable-frequency air compressor according to the PID algorithm and the target pressure value, and timing the duration of the constant pressure control to obtain the target duration;
judging whether the target time length is greater than or equal to a preset time length or not;
if the target time length is more than or equal to the preset time length, sequentially accumulating the values of i by taking 1 as a step length, continuously executing the step of setting the target pressure value according to a target model and the pressure increment, performing constant pressure control on the variable frequency air compressor according to the PID algorithm and the target pressure value, and timing the continuous time length of the constant pressure control to obtain the target time length until the target pressure value is equal to the set pressure value;
wherein the expression of the pressure increase is:
ΔP＝(P 2 -P a )/N；2≤N≤10；
the expression of the target model is as follows:
P j ＝P a +i*ΔP；
wherein Δ P is the pressure increase, P 2 Is the set pressure value, P a Is said first predetermined threshold, P j Is the target pressure value.
Preferably, after the process of determining whether the target duration is greater than or equal to a preset duration, the method further includes:
and if the target duration is less than the preset duration, continuing to execute the step of detecting the operating pressure value of the variable-frequency air compressor in real time.
Preferably, after the process of detecting the operating pressure value of the variable frequency air compressor in real time, the method further includes:
judging whether the operating pressure value is greater than or equal to the loading pressure value or not;
if the operating pressure value is greater than or equal to the loading pressure value, continuing to execute the step of judging whether the operating pressure value is greater than or equal to a first preset threshold value;
and if the operating pressure value is smaller than the loading pressure value, performing constant pressure control on the variable-frequency air compressor based on the PID algorithm according to the set pressure value.
Preferably, the method further comprises the following steps:
and when the operating pressure value is greater than or equal to the loading pressure value, calculating the pressure change rate of the variable-frequency air compressor according to a preset period to obtain a target change rate, and setting the preset duration according to the target change rate.
Preferably, when the operating pressure value is greater than or equal to the sum of the unloading pressure value and a third preset threshold, or the duration of the operating pressure value is greater than or equal to the unloading pressure value is greater than or equal to a preset delay duration, the pressure unloading process of the variable frequency air compressor includes:
judging whether the operating pressure value is smaller than the sum of the unloading pressure value and the third preset threshold value;
if the operating pressure value is larger than or equal to the sum of the unloading pressure value and the third preset threshold value, unloading the pressure of the variable frequency air compressor, and continuously executing the step of detecting the operating pressure value of the variable frequency air compressor in real time;
if the operating pressure value is smaller than the sum of the unloading pressure value and the third preset threshold, judging whether the operating pressure value is larger than or equal to the unloading pressure value;
if the operating pressure value is smaller than the unloading pressure value, continuing to execute the step of detecting the operating pressure value of the variable-frequency air compressor in real time;
if the operating pressure value is greater than or equal to the unloading pressure value, timing the duration of the operating pressure value which is greater than or equal to the unloading pressure value to obtain overload duration, and judging whether the overload duration is greater than or equal to the preset delay duration;
and if the overload time is more than or equal to the preset delay time, carrying out pressure unloading on the variable frequency air compressor, and continuously executing the step of detecting the operating pressure value of the variable frequency air compressor in real time.
Preferably, after the process of determining whether the overload duration is greater than or equal to the preset delay duration, the method further includes:
and if the overload time is less than the preset delay time, carrying out zero clearing operation on the overload time, and continuously executing the step of detecting the operating pressure value of the variable-frequency air compressor in real time.
Correspondingly, the invention also discloses a constant pressure control device of the variable frequency air compressor, which comprises:
the pressure detection module is used for detecting the operating pressure value of the variable frequency air compressor in real time and judging whether the operating pressure value is greater than or equal to a first preset threshold value or not; the difference value between the set pressure value and the unloading pressure value of the variable-frequency air compressor is smaller than a second preset threshold value; the first preset threshold value is larger than a loading pressure value of the variable frequency air compressor;
the pressure adjusting module is used for dynamically setting a target pressure value according to the first preset threshold value and the set pressure value if the operating pressure value is greater than or equal to the first preset threshold value, meanwhile, performing constant pressure control on the variable-frequency air compressor according to a PID algorithm and the target pressure value on the basis of the principle that the target pressure value gradually approaches the set pressure value along with the change of adjusting time;
and the pressure unloading module is used for unloading the pressure of the variable-frequency air compressor when the operating pressure value is greater than or equal to the sum of the unloading pressure value and a third preset threshold value, or the duration of the operating pressure value is greater than or equal to the unloading pressure value and is greater than or equal to a preset delay duration.
Correspondingly, the invention also discloses a constant pressure control device of the variable frequency air compressor, which comprises:
a memory for storing a computer program;
and the processor is used for realizing the steps of the constant-pressure control method of the variable-frequency air compressor disclosed in the foregoing when the computer program is executed.
Correspondingly, the invention also discloses a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and when the computer program is executed by a processor, the steps of the constant pressure control method of the variable frequency air compressor are realized.
Therefore, in the invention, firstly, the operation pressure value of the variable frequency air compressor is detected in real time, and whether the operation pressure value is more than or equal to a first preset threshold value is judged; if the operating pressure value of the variable-frequency air compressor is larger than or equal to the first preset threshold value, dynamically setting a target pressure value according to the first preset threshold value and the set pressure value, meanwhile, carrying out constant-pressure control on the variable-frequency air compressor according to a PID algorithm and the target pressure value on the basis of the principle that the target pressure value gradually approaches the set pressure value along with the change of the adjusting time. And when the operating pressure value of the variable-frequency air compressor is greater than or equal to the sum of the unloading pressure value and a third preset threshold value, or the duration of the operating pressure value of the variable-frequency air compressor is greater than or equal to the unloading pressure value and is greater than or equal to the preset delay duration, carrying out pressure unloading on the variable-frequency air compressor. Compared with the prior art, under the application scene of the small-pressure-difference variable frequency air compressor, because the PID differential link of the variable frequency air compressor is not required to be adjusted, the change condition of the operating pressure value of the variable frequency air compressor is pre-judged in advance, and the constant pressure adjusting process of the set pressure value of the variable frequency air compressor is interfered to adjust the operating process of the variable frequency air compressor, so that the pressure adjusting process of the variable frequency air compressor can be more moderate and stable, the phenomenon of overshoot of the variable frequency air compressor is inhibited, and the variable frequency air compressor can be ensured to rapidly enter the constant pressure operating state. Meanwhile, an unloading pressure delay protection mechanism of the variable frequency air compressor is added in the method, so that the phenomenon that the variable frequency air compressor is subjected to pressure unloading immediately due to the phenomenon of overshoot in the pressure regulating process can be prevented to a certain extent, and the stability and the reliability of the variable frequency air compressor in the operation process can be further ensured. Correspondingly, the constant-pressure control device, the equipment and the medium of the variable-frequency air compressor provided by the invention also have the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a constant pressure control method of a variable frequency air compressor according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a principle of a constant-pressure control method of a variable-frequency air compressor according to an embodiment of the present invention;
fig. 3 is a flowchart of another constant-pressure control method for an inverter air compressor according to an embodiment of the present invention;
fig. 4 is a flowchart of an unloading pressure delay protection method for a variable frequency air compressor according to an embodiment of the present invention;
fig. 5 is a structural diagram of a constant pressure control device of a variable frequency air compressor according to an embodiment of the present invention;
fig. 6 is a structural diagram of a constant pressure control device of an inverter air compressor according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart of a constant pressure control method of an inverter air compressor according to an embodiment of the present invention, where the method includes:
step S11: detecting an operating pressure value of the variable-frequency air compressor in real time, and judging whether the operating pressure value is greater than or equal to a first preset threshold value or not; the difference value between the set pressure value and the unloading pressure value of the variable-frequency air compressor is smaller than a second preset threshold value; the first preset threshold value is larger than the loading pressure value of the variable-frequency air compressor;
step S12: if the operating pressure value is greater than or equal to a first preset threshold value, dynamically setting a target pressure value according to the first preset threshold value and a set pressure value, and simultaneously carrying out constant pressure control on the variable-frequency air compressor according to a PID algorithm and a target pressure value on the basis of the principle that the target pressure value gradually approaches the set pressure value along with the change of the adjusting time;
step S13: and when the operation pressure value is greater than or equal to the sum of the unloading pressure value and a third preset threshold value, or the duration of the operation pressure value is greater than or equal to the unloading pressure value and is greater than or equal to the preset delay duration, carrying out pressure unloading on the variable-frequency air compressor.
In this embodiment, a constant-pressure control method for a variable-frequency air compressor is provided, which can ensure that the variable-frequency air compressor can reach a stable operation state and can also ensure that the variable-frequency air compressor can quickly enter a constant-pressure operation state.
In the method, firstly, the operating pressure value P of the variable frequency air compressor is detected in real time real And judging the operating pressure value P of the variable frequency air compressor real Whether the value is greater than or equal to a first preset threshold value P a (ii) a Wherein, the set pressure value P of the variable frequency air compressor 2 And the unloading pressure value P 3 The difference value between the two values is smaller than a second preset threshold value, and the characteristic shows that the variable frequency air compressor works in the application scene of small pressure difference. And, a first preset threshold value P a Greater than the loading pressure value P of the variable frequency air compressor 1 。
When the operating pressure value P of the variable frequency air compressor real Is greater than or equal to a first preset threshold value P a Then, the operating pressure value P of the variable frequency air compressor is described real Is larger than the pressure value of the variable frequency air compressor at the pressure adjusting inlet point. In this case, the phenomenon of overshoot of the variable frequency air compressor and the situation of pressure unloading are avoided. At this time, it is required to determine the first preset threshold P a And the set pressure value P of the variable frequency air compressor 2 And dynamically setting a target pressure value, and simultaneously carrying out constant pressure control on the variable-frequency air compressor according to a PID algorithm and the target pressure value on the basis of the principle that the target pressure value gradually approaches the set pressure value along with the change of the adjusting time. It should be noted that, according to the first preset threshold value P a And the set pressure value P of the variable frequency air compressor 2 Dynamically setting a target pressure value, and carrying out constant pressure control on the variable-frequency air compressor according to a PID algorithm and the target pressure value, wherein under the setting mechanism, the target pressure value refers to the variable-frequency airThe operating pressure value that the press will eventually reach.
The pressure change condition of the variable frequency air compressor is pre-judged in advance in the operation process of the variable frequency air compressor through the arrangement mode, and the set pressure value of the set constant-pressure operation of the variable frequency air compressor is adjusted according to the pressure change condition of the variable frequency air compressor. Based on the principle that the target pressure value gradually approaches the set pressure value along with the change of the adjusting time, and according to the PID algorithm and the target pressure value, the constant pressure control is carried out on the variable frequency air compressor, so that the operation pressure value which is finally reached by the variable frequency air compressor gradually approaches the set pressure value, namely, the variable frequency air compressor finally still carries out constant pressure operation with the set pressure value. By the method, the pressure adjusting process of the variable frequency air compressor can be ensured to be more moderate and stable, the phenomenon of overshoot of the variable frequency air compressor is inhibited, and the situation that the variable frequency air compressor is unloaded due to the fact that the variable frequency air compressor is not triggered to an unloading pressure point can be ensured. Obviously, the method does not need to adjust and modify a differential link in PID regulation, but directly carries out prejudgment and intervention on the constant-pressure regulation process of the variable-frequency air compressor, so that the method can ensure that the variable-frequency air compressor can more quickly enter a constant-pressure operation state.
If the software program executed by the constant-pressure control method of the variable-frequency air compressor is stored in the pressure adjustment strategy module of the variable-frequency air compressor, the schematic diagram of the operation principle of the variable-frequency air compressor shown in fig. 2 can be obtained. Referring to fig. 2, fig. 2 is a schematic diagram illustrating a principle of a constant-pressure control method of a variable-frequency air compressor according to an embodiment of the present invention. When the frequency conversion air compressor machine was in normal operating condition, the frequency conversion air compressor machine can carry out PID control to it according to the set pressure value, and at this in-process, can feed back the operating pressure value of frequency conversion air compressor machine in real time. When the operating pressure value of the variable-frequency air compressor is larger than or equal to the first preset threshold value, the operating pressure value of the variable-frequency air compressor is adjusted according to the methods from the step S11 to the step S13, and finally the variable-frequency air compressor can reach a constant-pressure operating state.
When the operating pressure value P of the variable frequency air compressor real Is greater than or equal toDischarge pressure value P 3 And a third predetermined threshold value P y Sum or operating pressure value P of variable frequency air compressor real Is greater than or equal to the unloading pressure value P 3 Is greater than or equal to a preset delay time period T d And then, pressure unloading is carried out on the variable frequency air compressor. Therefore, the delayed protection mechanism for unloading the pressure of the variable frequency air compressor is added in the constant pressure control method of the variable frequency air compressor.
Conceivably, when the operating pressure value P of the variable-frequency air compressor is real Is greater than or equal to the unloading pressure value P 3 Due to the preset delay time T d When the variable-frequency air compressor reaches the unloading pressure point, the variable-frequency air compressor does not immediately unload the pressure, but the operating pressure value P of the variable-frequency air compressor is real Greater than or equal to the unloading pressure value P 3 Is greater than or equal to a preset delay time period T d When, just can carry out pressure uninstallation to the frequency conversion air compressor machine. And when the variable frequency air compressor just overshoots the unloading pressure value, the operating pressure value P of the variable frequency air compressor is the dynamic adjustment process because the variable frequency air compressor is in the dynamic adjustment process at the moment real And can quickly drop to the unloading pressure value P 3 Under the condition, the variable frequency air compressor is at the unloading pressure value P 3 Is longer than a preset delay period T d The pressure unloading device is small, so that the situation that the pressure of the variable-frequency air compressor is unloaded due to the fact that the variable-frequency air compressor is triggered to an unloading pressure point can be avoided. In addition, when the operating pressure value P of the variable-frequency air compressor real Greater than or equal to the unloading pressure value P 3 And a third preset threshold value P y In sum, the pressure of the variable-frequency air compressor is directly unloaded, so that the potential safety hazard of explosion of the variable-frequency air compressor due to overlarge pressure of the air tank can be avoided, and the safe and stable operation of the variable-frequency air compressor can be guaranteed.
As can be seen, in this embodiment, firstly, the operation pressure value of the variable frequency air compressor is detected in real time, and whether the operation pressure value is greater than or equal to a first preset threshold value is judged; if the operating pressure value of the variable-frequency air compressor is larger than or equal to a first preset threshold value, dynamically setting a target pressure value according to the first preset threshold value and the set pressure value, meanwhile, carrying out constant-pressure control on the variable-frequency air compressor according to a PID algorithm and the target pressure value on the basis of the principle that the target pressure value gradually approaches the set pressure value along with the change of the adjusting time. And when the operating pressure value of the variable-frequency air compressor is greater than or equal to the sum of the unloading pressure value and a third preset threshold value, or the duration of the operating pressure value of the variable-frequency air compressor is greater than or equal to the unloading pressure value and is greater than or equal to the preset delay duration, carrying out pressure unloading on the variable-frequency air compressor. Compared with the prior art, under the application scene of the small-pressure-difference variable frequency air compressor, because the PID differential link of the variable frequency air compressor is not required to be adjusted, the change condition of the operating pressure value of the variable frequency air compressor is judged in advance, and the constant pressure adjusting process of the set pressure value of the variable frequency air compressor is intervened to adjust the operating process of the variable frequency air compressor, the pressure adjusting process of the variable frequency air compressor can be more moderate and stable, the phenomenon of overshoot of the variable frequency air compressor is inhibited, and therefore the variable frequency air compressor can be enabled to rapidly enter a constant pressure operating state. Meanwhile, an unloading pressure delay protection mechanism of the variable frequency air compressor is added in the method, so that the phenomenon that the variable frequency air compressor is subjected to pressure unloading immediately due to the phenomenon of overshoot in the pressure regulating process can be prevented to a certain extent, and the stability and the reliability of the variable frequency air compressor in the operation process can be further ensured.
Based on the above embodiments, this embodiment further describes and optimizes the technical solution, and as a preferred implementation, the above steps: according to first preset threshold value and the dynamic target pressure value of setting pressure value, simultaneously based on the principle that the target pressure value approaches the setting pressure value along with the change of regulation time gradually to according to PID algorithm, according to the process that the target pressure value carries out constant voltage control to frequency conversion air compressor machine, include:
setting a pressure increment according to a difference value between a first preset threshold value and a set pressure value;
setting a target pressure value according to a target model and a pressure increment by taking i equal to 1 as an initial value, performing constant pressure control on the variable frequency air compressor according to a PID algorithm and the target pressure value, and timing the duration of the constant pressure control to obtain a target duration;
judging whether the target time length is greater than or equal to a preset time length or not;
if the target time length is more than or equal to the preset time length, sequentially accumulating the values of i by taking 1 as a step length, continuously setting a target pressure value according to a target model and a pressure increment, performing constant pressure control on the variable-frequency air compressor according to a PID algorithm and the target pressure value, timing the duration of the constant pressure control, and obtaining the target time length until the target pressure value is equal to the set pressure value;
wherein the expression of the pressure increment is:
ΔP＝(P 2 -P a )/N；2≤N≤10；
the expression of the target model is:
P j ＝P a +i*ΔP；
wherein Δ P is the pressure increase, P 2 To set the pressure value, P a Is a first predetermined threshold value, P j Is the target pressure value.
In this embodiment, the constant pressure control process of the inverter air compressor is specifically described. When the operating pressure value P of the variable frequency air compressor real Is greater than or equal to a first preset threshold value P a Firstly according to a first preset threshold value P a And a set pressure value P 2 Setting a pressure increment delta P by the difference value, setting a target pressure value according to the target model and the pressure increment by taking i equal to 1 as an initial value, performing constant pressure control on the variable-frequency air compressor according to a PID algorithm and the target pressure value, and timing the duration of the constant pressure control to obtain the target duration. And if the target time length is more than or equal to the preset time length, sequentially accumulating the values of i by taking 1 as a step length, continuously setting a target pressure value according to the target model and the pressure increment, performing constant pressure control on the variable-frequency air compressor according to a PID algorithm and the target pressure value, timing the duration of the constant pressure control, and obtaining the target time length until the target pressure value is equal to the set pressure value. Therefore, the constant-pressure operation process of the variable-frequency air compressor is divided into N sections of adjusting processes, so that the constant-pressure operation process of the variable-frequency air compressor can be ensuredThe pressure regulation process of the variable frequency air compressor is more moderate and stable, the phenomenon of overshoot of the variable frequency air compressor is restrained, and meanwhile, the situation that the variable frequency air compressor cannot trigger an unloading pressure point to unload pressure is avoided.
If the target duration is less than the preset duration, the phenomenon of overshoot of the variable-frequency air compressor cannot occur temporarily, and an unloading pressure point cannot be triggered.
As a preferred embodiment, the above steps: after the process of real-time detection frequency conversion air compressor's operating pressure value, still include:
judging whether the operating pressure value is greater than or equal to the loading pressure value or not;
if the running pressure value is greater than or equal to the loading pressure value, continuing to execute the step of judging whether the running pressure value is greater than or equal to a first preset threshold value;
and if the operating pressure value is smaller than the loading pressure value, performing constant pressure control on the variable-frequency air compressor based on a PID algorithm according to the set pressure value.
Detecting operating pressure value P of variable frequency air compressor in real time real In time, in order to accurately know the running state of the variable frequency air compressor, the running pressure value P of the variable frequency air compressor can be judged firstly real Whether the pressure value is greater than the loading pressure value P of the variable-frequency air compressor or not 1 If the operating pressure value P of the variable frequency air compressor is equal to or greater than the preset operating pressure value real Loading pressure value P greater than or equal to frequency conversion air compressor 1 Then, the operating pressure value P of the variable frequency air compressor is continuously judged real Whether the value is greater than or equal to a first preset threshold value P a (ii) a If the operating pressure value P of the variable frequency air compressor is equal to the real Is less than the loading pressure value P of the frequency conversion air compressor 1 Based directly on the PID algorithm and according to the pressure set point P 2 And (4) carrying out constant pressure control on the variable frequency air compressor.
As a preferred embodiment, the constant voltage control method further includes:
and when the operating pressure value is greater than or equal to the loading pressure value, calculating the pressure change rate of the variable-frequency air compressor according to a preset period to obtain a target change rate, and setting a preset time length according to the target change rate.
In practical application, the pressure regulation duration of the variable frequency air compressor can be adjusted according to the pressure change rate of the variable frequency air compressor. Specifically, when the operating pressure value of the variable frequency air compressor is greater than or equal to the loading pressure value of the variable frequency air compressor, the pressure change rate of the variable frequency air compressor can be calculated according to a preset period to obtain a target change rate, and the preset duration is set according to the target change rate.
If the pressure change rate of the variable-frequency air compressor is greater than the preset pressure change rate threshold value, the pressure of the variable-frequency air compressor rises quickly, and the numerical value of the preset duration can be set to be larger; if the pressure change rate of the variable frequency air compressor is smaller than or equal to the preset pressure change rate threshold value, it indicates that the pressure of the variable frequency air compressor rises slowly, and at the moment, the preset time duration value can be set to be small.
In order to make those skilled in the art clearly know the implementation principle of the variable frequency air compressor provided in the present application, the constant pressure control method provided in the present application is described in detail by an application scenario embodiment. It should be noted that, when the constant-pressure control is performed on the variable-frequency air compressor in this scenario, the following operation parameters are preset in advance. That is, the loading pressure value of the variable frequency air compressor is set to be P 1 Setting the set pressure value of the variable frequency air compressor to be P 2 Setting the unloading pressure value of the variable frequency air compressor to be P 3 Setting the first preset threshold value as P a Setting the preset pressure change rate threshold value of the variable frequency air compressor to be P s . Meanwhile, in this embodiment, the constant pressure control process of the inverter air compressor is equally divided into 4 stages, and the target pressure values of the inverter air compressor are respectively set to P a +ΔP、P a +2*ΔP、P a +3 Δ P and P 2 The constant voltage regulation time of each stage is t 1 、t 2 、t 3 And t 4 。
Referring to fig. 3, fig. 3 is a flowchart of another constant pressure control method for an inverter air compressor according to an embodiment of the present invention. The method comprises the following steps:
step S101: real-time detection frequency conversion air compressor machine's operating pressure value P real ；
Step S102: judging operating pressure value P of variable frequency air compressor real Whether the pressure value is more than or equal to the loading pressure value P of the variable-frequency air compressor or not 1 ；
Step S103: if the operating pressure value P of the variable frequency air compressor is equal to the real Is less than the loading pressure value P of the variable frequency air compressor 1 Based on PID algorithm and according to set pressure value P 2 Performing constant-pressure control on the variable-frequency air compressor;
step S104: if the operating pressure value P of the variable frequency air compressor is equal to the real Loading pressure value P greater than or equal to variable frequency air compressor 1 Calculating the pressure change rate of the variable frequency air compressor according to a preset period to obtain a target change rate P d And determining the target rate of change P d Whether or not it is less than a preset pressure change rate threshold value P s ；
Step S105: if the target rate of change P d Less than a predetermined pressure rate of change threshold P s Setting the time multiplying power K to 1;
step S106: if the target rate of change P d Greater than or equal to a preset pressure change rate threshold value P s Setting the time multiplying power K to be 2;
step S107: judging operating pressure value P of variable frequency air compressor real Whether the value is greater than or equal to a first preset threshold value P a (ii) a If the operating pressure value P of the variable frequency air compressor is equal to the real Less than a first predetermined threshold P a Then, the PID algorithm is continuously executed and the pressure value P is set 2 Performing constant pressure control on the variable frequency air compressor;
step S108: if the operating pressure value P of the variable frequency air compressor is equal to the real Is greater than or equal to a first preset threshold value P a Set the target pressure value to P a + Δ P and according to P according to the PID algorithm a + delta P performs constant-pressure control on the variable-frequency air compressor, and simultaneously times the duration of the constant-pressure control to obtain the timing time T 1 ；
Step S109: judging the timing time T 1 Whether or not it is greater than or equal to K x t 1 (ii) a If the timing time T 1 Less than a predetermined duration K t 1 Then, step S101 is continuously executed: detecting the operating pressure value of the variable-frequency air compressor in real time;
step S110: if timing time T 1 Greater than or equal to K t 1 Set the target pressure value to P a +2 × Δ P and according to the PID algorithm, according to P a +2 × Δ P performs constant-pressure control on the variable-frequency air compressor, and simultaneously times the duration of the constant-pressure control to obtain the timing time T 2 ；
Step S111: judging the timing time T 2 Whether or not it is greater than or equal to K x t 2 (ii) a If timing time T 2 Less than a predetermined duration K t 2 Then, step S101 is continuously executed: detecting the operating pressure value of the variable frequency air compressor in real time;
step S112: if timing time T 2 Greater than or equal to K t 2 Set the target pressure value to P a +3 × Δ P and according to the PID algorithm, according to P a +3 × Δ P performs constant-pressure control on the variable-frequency air compressor, and simultaneously times the duration of the constant-pressure control to obtain the timing time T 3 ；
Step S113: judging the timing time T 3 Whether or not it is greater than or equal to K t 3 (ii) a If the timing time T 3 Less than a predetermined duration K t 3 Then, step S101 is continuously executed: detecting the operating pressure value of the variable-frequency air compressor in real time; if timing time T 3 At least K x t 3 Then, the PID algorithm is continuously executed and the pressure value P is set 2 And carrying out constant pressure control on the variable frequency air compressor.
Obviously, through the technical scheme that this embodiment provided, just can make the pressure adjustment process of variable frequency air compressor machine become more mitigatedly with steady to restrain the phenomenon that the variable frequency air compressor machine appears overshooting, just can guarantee from this that the variable frequency air compressor machine can enter into the constant voltage running state fast.
Based on the above embodiments, the present embodiment further describes and optimizes the technical solution, please refer to fig. 4, and fig. 4 is a flowchart of an unloading pressure delay protection method for a variable frequency air compressor according to an embodiment of the present invention. As a preferred embodiment, the above steps: when the sum of the unloading pressure value and the third preset threshold value is greater than or equal to the operating pressure value, or the duration of the unloading pressure value is greater than or equal to the preset delay duration, then the process of pressure unloading is carried out on the variable frequency air compressor, including:
step S301: judging the operating pressure value P real Whether or not it is less than the unloading pressure value P 3 And a third predetermined threshold value P y Summing;
step S302: if the operating pressure value P real Greater than or equal to the unloading pressure value P 3 And a third predetermined threshold value P y And if so, pressure unloading is carried out on the variable frequency air compressor, and the step S11 is continuously executed: detecting the operating pressure value of the variable frequency air compressor in real time;
step S303: if the operating pressure value P real Less than the unloading pressure value P 3 And a third predetermined threshold value P y If the sum is equal, the operating pressure value P is judged real Whether or not it is greater than or equal to the unloading pressure value P 3 (ii) a If the operating pressure value P real Less than the unloading pressure value P 3 Then, step S11 is continued: real-time detection frequency conversion air compressor machine's operating pressure value P real ；
Step S304: if the operating pressure value P real Greater than or equal to the unloading pressure value P 3 Then for the operating pressure value P real Greater than or equal to the unloading pressure value P 3 The duration of the time is timed to obtain the overload duration T cnt And judging the overload duration T cnt Whether it is greater than or equal to the preset delay time T d (ii) a If the overload duration T cnt Is greater than or equal to the preset delay time T d If yes, pressure unloading is carried out on the variable frequency air compressor, and the step S11 is continuously executed: operating pressure value P of real-time detection frequency conversion air compressor real 。
In this embodiment, the unloading pressure delay protection mechanism of the inverter air compressor provided in this application is specifically described. In the operation process of the variable-frequency air compressor, the operation pressure value P of the variable-frequency air compressor can be judged in real time real Whether or not it is less than the unloading pressure value P 3 And a third predetermined threshold value P y Summing; if the operating pressure value P of the variable frequency air compressor is equal to the real Greater than or equal to the unloading pressure value P 3 And a third predetermined threshold value P y And the sum indicates that the pressure born by the gas tank in the variable-frequency air compressor is large, so that the phenomenon of explosion of the variable-frequency air compressor is easily caused, at the moment, the pressure unloading of the variable-frequency air compressor is required, and the step S11 is continuously executed: and detecting the operating pressure value of the variable-frequency air compressor in real time.
If the operating pressure value P of the variable frequency air compressor is equal to the real Less than the unloading pressure value P 3 And a third predetermined threshold value P y And if so, judging the operating pressure value P of the variable frequency air compressor real Whether or not it is greater than or equal to the unloading pressure value P 3 . If the operating pressure value P of the variable frequency air compressor is equal to the real Less than the unloading pressure value P 3 Then, step S11 is continued: real-time detection frequency conversion air compressor machine's operating pressure value P real (ii) a If the operating pressure value P of the variable frequency air compressor is equal to the real Greater than or equal to the unloading pressure value P 3 Then to the operating pressure value P of the variable frequency air compressor real Greater than or equal to the unloading pressure value P 3 The duration of the time is timed to obtain the overload duration T cnt And judging the overload duration T cnt Whether it is greater than or equal to the preset delay time length T d (ii) a If overload duration T cnt Is greater than or equal to the preset delay time T d If the pressure born by the gas tank in the variable-frequency air compressor is large, the phenomenon that the variable-frequency air compressor explodes is easily caused, the variable-frequency air compressor needs to be subjected to pressure unloading at the moment, and the step S11 is continuously executed: and detecting the operating pressure value of the variable-frequency air compressor in real time.
As a preferred embodiment, the above steps: judging overload duration T cnt Whether it is greater than or equal to the preset delay time T d After the process of (1), further comprising:
step S305: if the overload duration T cnt Less than a predetermined delay period T d For the overload duration T cnt Performing a clear operation, and continuing to execute step S11: real-time detection frequency conversion air compressor machine's operating pressure value P real 。
If it is notTime duration of overload T cnt Less than a predetermined delay period T d The description shows that the variable frequency air compressor just overshoots the unloading pressure point at the moment, but the operating pressure value of the variable frequency air compressor can be quickly reduced below the unloading pressure point because the variable frequency air compressor is in the dynamic adjusting stage. In this case, only the overload duration T is needed cnt Performing a clear operation, and continuing to execute step S11: and detecting the operating pressure value of the variable-frequency air compressor in real time.
Obviously, through the technical scheme that this embodiment provided, just can prevent to a certain extent that variable frequency air compressor machine from appearing the overshoot phenomenon and carrying out the phenomenon of pressure uninstallation immediately at the pressure regulating in-process, so, just can further guarantee variable frequency air compressor machine at the overall stability of operation in-process through this delay protection mechanism.
Referring to fig. 5, fig. 5 is a structural diagram of a constant pressure control device of an inverter air compressor according to an embodiment of the present invention, the device includes:
the pressure detection module 21 is used for detecting an operating pressure value of the variable frequency air compressor in real time and judging whether the operating pressure value is greater than or equal to a first preset threshold value; the difference value between the set pressure value and the unloading pressure value of the variable-frequency air compressor is smaller than a second preset threshold value; the first preset threshold value is larger than the loading pressure value of the variable-frequency air compressor;
the pressure adjusting module 22 is used for dynamically setting a target pressure value according to the first preset threshold value and a set pressure value if the operating pressure value is greater than or equal to the first preset threshold value, meanwhile, performing constant pressure control on the variable-frequency air compressor according to a PID algorithm and the target pressure value on the basis of the principle that the target pressure value gradually approaches the set pressure value along with the change of the adjusting time;
and the pressure unloading module 23 is configured to, when the operating pressure value is greater than or equal to the sum of the unloading pressure value and a third preset threshold, or the duration of the operating pressure value being greater than or equal to the unloading pressure value is greater than or equal to a preset delay duration, perform pressure unloading on the variable frequency air compressor.
The constant-pressure control device of the variable-frequency air compressor has the beneficial effects of the constant-pressure control method of the variable-frequency air compressor disclosed by the embodiment of the invention.
Referring to fig. 6, fig. 6 is a structural diagram of a constant pressure control device of an inverter air compressor according to an embodiment of the present invention, where the device includes:
a memory 31 for storing a computer program;
and the processor 32 is used for realizing the steps of the constant pressure control method of the variable frequency air compressor as disclosed in the foregoing when executing the computer program.
The constant-pressure control equipment of the variable-frequency air compressor provided by the embodiment of the invention has the beneficial effects of the constant-pressure control method of the variable-frequency air compressor disclosed by the embodiment.
Correspondingly, the embodiment of the invention further provides a computer-readable storage medium, a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the constant-pressure control method for the variable-frequency air compressor disclosed in the foregoing are implemented.
The computer-readable storage medium provided by the embodiment of the invention has the beneficial effects of the constant-pressure control method of the variable-frequency air compressor disclosed in the foregoing.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The method, the device, the equipment and the medium for controlling the constant pressure of the variable-frequency air compressor provided by the invention are described in detail, a specific example is applied in the text to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. The constant-pressure control method of the variable-frequency air compressor is characterized by comprising the following steps of:
detecting an operating pressure value of the variable-frequency air compressor in real time, and judging whether the operating pressure value is greater than or equal to a first preset threshold value or not; the difference value between the set pressure value and the unloading pressure value of the variable-frequency air compressor is smaller than a second preset threshold value; the first preset threshold value is larger than a loading pressure value of the variable frequency air compressor;
if the operating pressure value is greater than or equal to the first preset threshold value, dynamically setting a target pressure value according to the first preset threshold value and the set pressure value, and meanwhile, performing constant-pressure control on the variable-frequency air compressor according to a PID algorithm and the target pressure value on the basis of the principle that the target pressure value gradually approaches the set pressure value along with the change of the adjusting time;
and when the operation pressure value is greater than or equal to the sum of the unloading pressure value and a third preset threshold value, or the duration of the operation pressure value is greater than or equal to the unloading pressure value and is greater than or equal to a preset delay duration, carrying out pressure unloading on the variable-frequency air compressor.
2. The constant pressure control method according to claim 1, wherein the process of dynamically setting a target pressure value according to the first preset threshold and the set pressure value, and performing constant pressure control on the inverter air compressor according to the target pressure value according to a PID algorithm based on a principle that the target pressure value gradually approaches the set pressure value along with a change of an adjustment time, comprises:
setting a pressure increment according to a difference value between the first preset threshold value and the set pressure value;
setting the target pressure value according to a target model and the pressure increment by taking i equal to 1 as an initial value, performing constant pressure control on the variable-frequency air compressor according to the PID algorithm and the target pressure value, and timing the duration of the constant pressure control to obtain the target duration;
judging whether the target time length is greater than or equal to a preset time length or not;
if the target time length is more than or equal to the preset time length, sequentially accumulating the values of i by taking 1 as a step length, continuously executing the step of setting the target pressure value according to a target model and the pressure increment, performing constant pressure control on the variable frequency air compressor according to the PID algorithm and the target pressure value, and timing the continuous time length of the constant pressure control to obtain the target time length until the target pressure value is equal to the set pressure value;
wherein the expression of the pressure increase is:
ΔP＝(P 2 -P a )/N；2≤N≤10；
the expression of the target model is as follows:
P j ＝P a +i*ΔP；
wherein Δ P is the pressure increase, P 2 Is the set pressure value, P a Is said first predetermined threshold, P j Is the target pressure value.
3. The constant voltage control method according to claim 2, wherein the process of determining whether the target time period is equal to or greater than a preset time period further comprises:
and if the target duration is less than the preset duration, continuously executing the step of detecting the operating pressure value of the variable-frequency air compressor in real time.
4. The constant pressure control method according to claim 2, wherein after the process of detecting the operating pressure value of the inverter air compressor in real time, the method further comprises:
judging whether the operating pressure value is greater than or equal to the loading pressure value or not;
if the operating pressure value is greater than or equal to the loading pressure value, continuing to execute the step of judging whether the operating pressure value is greater than or equal to a first preset threshold value;
and if the operating pressure value is smaller than the loading pressure value, performing constant pressure control on the variable frequency air compressor based on the PID algorithm and according to the set pressure value.
5. The constant voltage control method according to claim 4, further comprising:
and when the operating pressure value is greater than or equal to the loading pressure value, calculating the pressure change rate of the variable-frequency air compressor according to a preset period to obtain a target change rate, and setting the preset duration according to the target change rate.
6. The constant pressure control method according to claim 1, wherein the pressure unloading process for the inverter air compressor when the operating pressure value is greater than or equal to the sum of the unloading pressure value and a third preset threshold value, or the duration of the operating pressure value is greater than or equal to the unloading pressure value is greater than or equal to a preset delay duration comprises:
judging whether the operating pressure value is smaller than the sum of the unloading pressure value and the third preset threshold value;
if the operating pressure value is larger than or equal to the sum of the unloading pressure value and the third preset threshold value, unloading the pressure of the variable frequency air compressor, and continuously executing the step of detecting the operating pressure value of the variable frequency air compressor in real time;
if the operating pressure value is smaller than the sum of the unloading pressure value and the third preset threshold, judging whether the operating pressure value is larger than or equal to the unloading pressure value;
if the operating pressure value is smaller than the unloading pressure value, continuing to execute the step of detecting the operating pressure value of the variable-frequency air compressor in real time;
if the operating pressure value is greater than or equal to the unloading pressure value, timing the duration of the operating pressure value which is greater than or equal to the unloading pressure value to obtain overload duration, and judging whether the overload duration is greater than or equal to the preset delay duration or not;
and if the overload time is more than or equal to the preset delay time, carrying out pressure unloading on the variable frequency air compressor, and continuously executing the step of detecting the operating pressure value of the variable frequency air compressor in real time.
7. The constant voltage control method according to claim 6, wherein the determining whether the overload time period is greater than or equal to the preset delay time period is followed by:
and if the overload time is less than the preset delay time, carrying out zero clearing operation on the overload time, and continuously executing the step of detecting the operating pressure value of the variable frequency air compressor in real time.
8. The utility model provides a constant voltage control device of frequency conversion air compressor machine which characterized in that includes:
the pressure detection module is used for detecting the operating pressure value of the variable frequency air compressor in real time and judging whether the operating pressure value is greater than or equal to a first preset threshold value or not; the difference value between the set pressure value and the unloading pressure value of the variable-frequency air compressor is smaller than a second preset threshold value; the first preset threshold value is larger than a loading pressure value of the variable frequency air compressor;
the pressure adjusting module is used for dynamically setting a target pressure value according to the first preset threshold value and the set pressure value if the operating pressure value is greater than or equal to the first preset threshold value, meanwhile, performing constant pressure control on the variable-frequency air compressor according to a PID algorithm and the target pressure value on the basis of the principle that the target pressure value gradually approaches the set pressure value along with the change of adjusting time;
and the pressure unloading module is used for unloading the pressure of the variable-frequency air compressor when the operating pressure value is greater than or equal to the sum of the unloading pressure value and a third preset threshold value, or the duration of the operating pressure value is greater than or equal to the unloading pressure value and is greater than or equal to a preset delay duration.
9. The utility model provides a constant voltage control equipment of frequency conversion air compressor machine which characterized in that includes:
a memory for storing a computer program;
a processor for implementing the steps of the constant pressure control method of the inverter air compressor according to any one of claims 1 to 7 when the computer program is executed.
10. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method for controlling constant pressure of an inverter air compressor according to any one of claims 1 to 7 are implemented.
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| CN202310125117.1A CN115949579A (en) | 2023-02-10 | 2023-02-10 | Constant-pressure control method, device, equipment and medium for variable-frequency air compressor |
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| CN202310125117.1A CN115949579A (en) | 2023-02-10 | 2023-02-10 | Constant-pressure control method, device, equipment and medium for variable-frequency air compressor |
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