CN108397375B - Compressor control method, air conditioner and storage medium - Google Patents
Compressor control method, air conditioner and storage medium Download PDFInfo
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- CN108397375B CN108397375B CN201810126305.5A CN201810126305A CN108397375B CN 108397375 B CN108397375 B CN 108397375B CN 201810126305 A CN201810126305 A CN 201810126305A CN 108397375 B CN108397375 B CN 108397375B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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Abstract
The invention discloses a control method of a compressor, which comprises the steps of monitoring the exhaust pressure and the suction pressure of the compressor after the compressor is started for a first preset time, judging whether the detected exhaust pressure and the detected suction pressure are in corresponding preset ranges, and regulating the running frequency of the compressor when the exhaust pressure and the suction pressure are out of the corresponding preset ranges to limit the exhaust pressure and the suction pressure in the corresponding preset ranges and ensure that the compressor normally runs in a normal running pressure range. The invention also discloses an air conditioner and a storage medium. The invention avoids the damage to the compressor caused by the long-term operation of the compressor outside the normal operation pressure range, prolongs the service life of the compressor and improves the operation reliability of the compressor and the air conditioner.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method of a compressor, an air conditioner and a storage medium.
Background
The precise air conditioner needs to work continuously for 24 hours every day, the core of the air conditioner is a compressor, and the essential condition for ensuring the long-term continuous operation of the precise air conditioner is to ensure that the compressor operates in a normal working range.
When the compressor is delivered from a factory, a corresponding compressor specification is attached, and the compressor specification comprises a normal operation pressure range diagram of the compressor so as to ensure that the compressor operates within the normal operation pressure range. However, when the compressor runs, only simple pressure limits such as high-pressure alarm and low-pressure alarm are given, the control method is complex, the compressor can run out of the normal running pressure range due to the change of the affected factors, and when the compressor runs out of the normal running pressure range for a long time, the service life and the running reliability of the compressor are seriously affected.
Disclosure of Invention
The invention mainly aims to provide a control method of a compressor, aiming at prolonging the service life of the compressor and improving the operation reliability of the compressor.
In order to achieve the above object, the present invention provides a method for controlling a compressor, comprising the steps of:
monitoring the exhaust pressure P of the compressor after the compressor is started for a first preset time periodkAnd suction pressure Po；
Judging the exhaust pressure PkAnd suction pressure PoWhether the current time is within the corresponding preset range;
if not, then adjustAdjusting the operating frequency of the compressor to discharge the discharge pressure PkAnd said suction pressure PoLimited to the corresponding preset range.
Further, the exhaust pressure P is judgedkAnd suction pressure PoWhether the current time is within the corresponding preset range or not comprises the following steps:
judging the exhaust pressure P according to a preset compressor operation pressure range diagramkAnd suction pressure PoWhether it is in the corresponding preset range.
Further, the exhaust pressure P is judged according to a preset compressor operation pressure range diagramkAnd suction pressure PoWhether the current time is within the corresponding preset range or not comprises the following steps:
at the suction pressure P of the compressoroDischarge pressure P of compressor as x-axiskConstructing a plane coordinate system for the y axis;
marking a first function region corresponding to a preset compressor operation pressure range diagram in the plane coordinate system;
the detected exhaust pressure PkAnd suction pressure PoAnd converting the pressure coordinate point into a pressure coordinate point of the plane coordinate system, and judging whether the pressure coordinate point falls into the first function area.
Further, if not, adjusting the operating frequency of the compressor to adjust the discharge pressure PkAnd said suction pressure PoLimiting to a corresponding preset range, comprising:
when the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is positioned outside the first function area, judging whether the pressure coordinate point is positioned in a second function area;
if yes, limiting the frequency increasing or reducing of the compressor to increase or decrease the exhaust pressure PkAnd said suction pressure PoLimiting the range to a corresponding preset range;
if not, controlling the compressor to increase or decrease the frequency based on the current running frequency of the compressor, or triggering an alarm prompt and closing the compressor.
Further, if yes, the frequency increasing or reducing of the compressor is limited so as to enable the exhaust pressure P to be increased or decreasedkAnd said suction pressure PoLimiting to a corresponding preset range, comprising:
when the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is located in the second function area, acquiring the current operating frequency of the compressor;
when the current operating frequency reaches a preset minimum frequency, limiting the compressor to reduce the frequency so as to discharge the pressure PkAnd said suction pressure PoLimiting the range to a corresponding preset range;
limiting the compressor frequency increase to enable the discharge pressure P when the current operation frequency reaches a preset maximum frequencykAnd said suction pressure PoLimited to the corresponding preset range.
Further, if yes, the frequency increasing or reducing of the compressor is limited so as to enable the exhaust pressure P to be increased or decreasedkAnd said suction pressure PoLimiting to a corresponding preset range, comprising:
when the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is located in the second function area, determining the position of the pressure coordinate point in the second function area;
limiting compressor boost frequency to set the discharge pressure P when the pressure coordinate point is in a first region within a second function regionkAnd said suction pressure PoLimiting the range to a corresponding preset range;
when the pressure coordinate point is located in a second area in a second function area, limiting the compressor to reduce the frequency to enable the exhaust pressure PkAnd said suction pressure PoLimited to the corresponding preset range.
Further, if not, the step of controlling the compressor to increase or decrease the frequency based on the current operating frequency of the compressor, or turning off the compressor after triggering an alarm prompt includes:
when the exhaust pressure P iskAnd suction pressure PoCorresponding toWhen the pressure coordinate point is located in a third function area outside the second function area, judging whether the current running frequency of the compressor is greater than a preset lowest frequency;
if so, controlling the compressor to reduce the frequency by a first preset amplitude for a third preset time at intervals of a second preset time until the pressure coordinate point does not belong to the third function area or the operating frequency of the compressor is reduced to a preset lowest frequency;
if not, triggering an inspiration low-pressure alarm prompt and closing the compressor;
and the third preset time length is less than the second preset time length and less than the first preset time length.
Further, if not, the step of controlling the compressor to increase or decrease the frequency based on the current operating frequency of the compressor, or turning off the compressor after triggering an alarm prompt includes:
when the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is located in a fourth function area outside the second function area, judging whether the current operating frequency of the compressor is greater than a preset lowest frequency;
if so, controlling the compressor to reduce the frequency by a second preset amplitude for a fifth preset time at intervals of a fourth preset time until the pressure coordinate point does not belong to the fourth function area or the operating frequency of the compressor is reduced to a preset lowest frequency;
if not, triggering an exhaust high-pressure alarm prompt and closing the compressor;
wherein the fifth preset time length is less than the fourth preset time length is less than the first preset time length.
Further, if not, the step of controlling the compressor to increase or decrease the frequency based on the current operating frequency of the compressor, or turning off the compressor after triggering an alarm prompt includes:
when the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is located in a fifth function area outside the second function area, judging whether the current operating frequency of the compressor is less than the preset highest frequency;
if so, controlling the compressor to increase the frequency by a third preset amplitude for a seventh preset time at intervals of a sixth preset time until the pressure coordinate point does not belong to the fifth function area or the operating frequency of the compressor is increased to a preset maximum frequency;
if not, then at Po＞PomaxTime-triggered inspiration high-pressure alarm prompt and compressor off, or at Po≤PomaxTriggering an exhaust low-pressure alarm prompt and closing the compressor;
wherein the seventh preset time is longer than the sixth preset time and is shorter than the first preset time, PomaxA preset maximum suction pressure.
Further, when the discharge pressure P of the compressor is higher than the discharge pressure P of the compressorkAnd suction pressure PoAnd when the current control logic is in the corresponding preset range, controlling the compressor to continuously operate according to the current control logic.
The invention further provides an air conditioner, which comprises a compressor, a memory, a processor and a control program which is stored in the memory and can run on the processor, wherein the control program realizes the steps of the control method of the compressor when being executed by the processor.
The invention also proposes a storage medium storing a control program which, when executed by a processor, implements the steps of the control method of the compressor as described above.
According to the control method of the compressor, after the compressor is started for the first preset time, the exhaust pressure and the suction pressure of the compressor are monitored, whether the detected exhaust pressure and the detected suction pressure are in the corresponding preset ranges or not is judged, and when the exhaust pressure and the suction pressure are out of the corresponding preset ranges, the operation frequency of the compressor is adjusted to limit the exhaust pressure and the suction pressure in the corresponding preset ranges, so that the compressor is guaranteed to normally operate in a normal operation pressure range. When the control method judges that the exhaust pressure and the suction pressure of the compressor are out of the corresponding preset ranges, the operation frequency of the compressor is adjusted, the exhaust pressure and the suction pressure are limited in the corresponding preset ranges, the compressor is ensured to operate in the normal operation pressure range, the damage to the compressor caused by long-term operation of the compressor out of the normal operation pressure range is avoided, the service life of the compressor is prolonged, and the operation reliability of the compressor and an air conditioner is improved.
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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of a hardware configuration of an embodiment of an air conditioner according to the present invention;
FIG. 2 is a schematic flow chart illustrating an embodiment of a method for controlling a compressor according to the present invention;
FIG. 3 is a flowchart illustrating an embodiment of step S20 in FIG. 2;
FIG. 4 is a schematic diagram of one embodiment of a compressor operating pressure range map of the present invention;
FIG. 5 is a flowchart illustrating an embodiment of step S21 in FIG. 3;
FIG. 6 is a flowchart illustrating an embodiment of step S30 in FIG. 2;
FIG. 7 is a flowchart illustrating a first embodiment of step S32 in FIG. 6;
FIG. 8 is a flowchart illustrating a second embodiment of step S32 in FIG. 6;
FIG. 9 is a flowchart illustrating a first embodiment of step S33 in FIG. 6;
FIG. 10 is a flowchart illustrating a second embodiment of step S33 in FIG. 6;
fig. 11 is a flowchart illustrating the third embodiment of step S33 in fig. 6.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, fig. 1 is a schematic diagram of a hardware structure of an embodiment of an air conditioner of the present invention.
As shown in fig. 1, the air conditioner 100 may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display unit (Display) and an input unit such as an interactive interface, in the present invention, the air conditioner 100 may interact with a user terminal during software operation, when performing parameter setting or debugging on the air conditioner 100, a tester or a setter may input data information by using the user interface 1003, and the optional user interface 1003 may further include a standard wired interface or a standard wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Optionally, the air conditioner 100 may further include a camera, a Radio Frequency (RF) circuit, a sensor, an audio circuit, a WiFi module, and the like. Such as light sensors, motion sensors, air quality sensors, and other sensors. Specifically, the light sensor may include an ambient light sensor that adjusts the brightness of the display unit according to the brightness of ambient light, and a proximity sensor that turns on the display unit and/or a backlight when detecting that a person walks into the air conditioner 100. As the environment detecting element, the air quality sensor may be a temperature sensor, a humidity sensor, a carbon dioxide sensor, and a PM2.5 sensor, and the air quality sensor in this embodiment is preferably a temperature and humidity sensor, so as to detect indoor and outdoor temperatures and humidities of the environment where the air conditioner is located in real time; of course, the air conditioner 100 may also be configured with other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, and an infrared sensor, which are not described herein again. This embodiment is to be accurateDetecting exhaust pressure P of air conditionerkAnd suction pressure PoPressure sensors are provided at both the discharge port and the suction port of the compressor.
Those skilled in the art will appreciate that the hardware configuration shown in fig. 1 does not constitute a limitation of the air conditioner 100 and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
The main solution of the embodiment of the invention is as follows: the method comprises the steps of monitoring the exhaust pressure and the suction pressure of a compressor after the compressor is started for a first preset time, judging whether the detected exhaust pressure and suction pressure are in corresponding preset ranges, and regulating the operating frequency of the compressor when the exhaust pressure and the suction pressure are out of the corresponding preset ranges to limit the exhaust pressure and the suction pressure in the corresponding preset ranges and ensure that the compressor normally operates in a normal operating pressure range. When the control method judges that the exhaust pressure and the suction pressure of the compressor are out of the corresponding preset ranges, the operation frequency of the compressor is adjusted, the exhaust pressure and the suction pressure are limited in the corresponding preset ranges, the compressor is ensured to operate in the normal operation pressure range, the damage to the compressor caused by long-term operation of the compressor out of the normal operation pressure range is avoided, the service life of the compressor is prolonged, and the operation reliability of the compressor and an air conditioner is improved.
As shown in fig. 1, a memory 1005, which is a kind of computer storage medium, may include an operating system, a network communication module, and a control program therein.
In the air conditioner 100 shown in fig. 1, the air conditioner 100 is provided with a pressure sensor to detect a discharge pressure P of a compressorkAnd suction pressure PoThe network interface 1004 is mainly used for connecting a background server or a big data cloud, and performing data communication with the background server or the big data cloud to obtain a normal operation pressure range diagram of the compressor; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may call the control program stored in the memory 1005 and perform the following operations:
monitoring the exhaust pressure P of the compressor after the compressor is started for a first preset time periodkAnd suction pressure Po；
Judging the exhaust pressure PkAnd suction pressure PoWhether the current time is within the corresponding preset range;
if not, adjusting the running frequency of the compressor to discharge the pressure PkAnd said suction pressure PoLimited to the corresponding preset range.
Further, the processor 1001 may also call the control program stored in the memory 1005 to perform the following operations:
judging the exhaust pressure P according to a preset compressor operation pressure range diagramkAnd suction pressure PoWhether it is in the corresponding preset range.
Further, the processor 1001 may also call the control program stored in the memory 1005 to perform the following operations:
at the suction pressure P of the compressoroDischarge pressure P of compressor as x-axiskConstructing a plane coordinate system for the y axis;
marking a first function region corresponding to a preset compressor operation pressure range diagram in the plane coordinate system;
the detected exhaust pressure PkAnd suction pressure PoAnd converting the pressure coordinate point into a pressure coordinate point of the plane coordinate system, and judging whether the pressure coordinate point falls into the first function area.
Further, the processor 1001 may also call the control program stored in the memory 1005 to perform the following operations:
when the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is positioned outside the first function area, judging whether the pressure coordinate point is positioned in a second function area;
if yes, limiting the frequency increasing or reducing of the compressor to increase or decrease the exhaust pressure PkAnd said suction pressure PoLimiting the range to a corresponding preset range;
if not, controlling the compressor to increase or decrease the frequency based on the current running frequency of the compressor, or triggering an alarm prompt and closing the compressor.
Further, the processor 1001 may also call the control program stored in the memory 1005 to perform the following operations:
when the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is located in the second function area, acquiring the current operating frequency of the compressor;
when the current operating frequency reaches a preset minimum frequency, limiting the compressor to reduce the frequency so as to discharge the pressure PkAnd said suction pressure PoLimiting the range to a corresponding preset range;
limiting the compressor frequency increase to enable the discharge pressure P when the current operation frequency reaches a preset maximum frequencykAnd said suction pressure PoLimited to the corresponding preset range.
Further, the processor 1001 may also call the control program stored in the memory 1005 to perform the following operations:
when the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is located in the second function area, determining the position of the pressure coordinate point in the second function area;
limiting compressor boost frequency to set the discharge pressure P when the pressure coordinate point is in a first region within a second function regionkAnd said suction pressure PoLimiting the range to a corresponding preset range;
when the pressure coordinate point is located in a second area in a second function area, limiting the compressor to reduce the frequency to enable the exhaust pressure PkAnd said suction pressure PoLimited to the corresponding preset range.
Further, the processor 1001 may also call the control program stored in the memory 1005 to perform the following operations:
when the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is located in a third function area outside the second function area, judging whether the current operating frequency of the compressor is greater than a preset lowest frequency;
if so, controlling the compressor to reduce the frequency by a first preset amplitude for a third preset time at intervals of a second preset time until the pressure coordinate point does not belong to the third function area or the operating frequency of the compressor is reduced to a preset lowest frequency;
if not, triggering an inspiration low-pressure alarm prompt and closing the compressor;
and the third preset time length is less than the second preset time length and less than the first preset time length.
Further, the processor 1001 may also call the control program stored in the memory 1005 to perform the following operations:
when the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is located in a fourth function area outside the second function area, judging whether the current operating frequency of the compressor is greater than a preset lowest frequency;
if so, controlling the compressor to reduce the frequency by a second preset amplitude for a fifth preset time at intervals of a fourth preset time until the pressure coordinate point does not belong to the fourth function area or the operating frequency of the compressor is reduced to a preset lowest frequency;
if not, triggering an exhaust high-pressure alarm prompt and closing the compressor;
wherein the fifth preset time length is less than the fourth preset time length is less than the first preset time length.
Further, the processor 1001 may also call the control program stored in the memory 1005 to perform the following operations:
when the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is located in a fifth function area outside the second function area, judging whether the current operating frequency of the compressor is less than the preset highest frequency;
if so, controlling the compressor to increase the frequency by a third preset amplitude for a seventh preset time at intervals of a sixth preset time until the pressure coordinate point does not belong to the fifth function area or the operating frequency of the compressor is increased to a preset maximum frequency;
if not, then at Po＞PomaxTime-triggered inspiration high-pressure alarm prompt and compressor off, or at Po≤PomaxTriggering an exhaust low-pressure alarm prompt and closing the compressor;
wherein the seventh preset time is longer than the sixth preset time and is shorter than the first preset time, PomaxA preset maximum suction pressure.
Further, the processor 1001 may also call the control program stored in the memory 1005 to perform the following operations:
when the discharge pressure P of the compressorkAnd suction pressure PoAnd when the current control logic is in the corresponding preset range, controlling the compressor to continuously operate according to the current control logic.
Further, referring to fig. 2, fig. 2 is a flowchart illustrating a control method of the compressor according to an embodiment of the present invention.
In this embodiment, the method for controlling the compressor includes the steps of:
s10: monitoring the exhaust pressure P of the compressor after the compressor is started for a first preset time periodkAnd suction pressure Po；
In this embodiment, the control method of the compressor is mainly used for controlling the compressor to operate within a normal operating pressure range, and avoiding that the compressor is damaged due to long-term operation outside the normal pressure range, and the service life and the operation reliability of the compressor and the air conditioner are seriously affected. For this, the present invention detects the discharge pressure P of the compressor using the first pressure sensor disposed between the discharge port of the compressor and the condenser after the air conditioner is startedkDetecting the suction pressure P of the compressor by a second pressure sensor arranged between the suction port of the compressor and the evaporatoro. The method comprises the steps of not judging the operating pressure range of the compressor within a first preset time period of starting and operating the compressor, and entering a control logic for monitoring the suction pressure and the exhaust pressure in real time after the first preset time period, wherein the first preset time period is 4-6 min, and is preferably 5 min.
S20: judging the exhaust pressure PkAnd suction pressure PoWhether the current time is within the corresponding preset range;
in the preset control logic, the exhaust pressure P is monitored in real timekAnd suction pressure PoJudging the exhaust pressure PkAnd suction pressure PoWhether it is in the corresponding preset range. The preset range first needs to satisfy: minimum exhaust pressure PkminExhaust pressure P is less than or equal tokNot more than the maximum exhaust pressure PkmaxMinimum suction pressure PominNot more than suction pressure PkNot more than maximum suction pressure Pomax(ii) a Secondly, in order to further eliminate the influence on the service life and the operation stability of the compressor when the air conditioner operates outside the normal operation pressure range caused by overhigh exhaust pressure and overlow suction pressure, overhigh exhaust pressure and suction pressure, overhigh suction pressure and overlow exhaust pressure and overhigh suction pressure, the exhaust pressure P is further optimizedkAnd suction pressure PoCorresponding preset ranges, as further referring to FIG. 3, FIG. 3 provides a graphical representation of exhaust pressure PkAnd suction pressure PoAnd judging the corresponding preset range: such as, for example,
s21: judging the exhaust pressure P according to a preset compressor operation pressure range diagramkAnd suction pressure PoWhether it is in the corresponding preset range.
With further reference to fig. 4, fig. 4 is a schematic diagram of an embodiment of a compressor operating pressure range map of the present invention. Fig. 4 corresponds to only one type of compressor, and fig. 4 is also replaced with a corresponding map of the operating pressure range of the compressor when other types of compressors are used. As shown in fig. 4, the exhaust pressure P is being carried outkAnd suction pressure PoWhen judging whether the exhaust pressure is in the corresponding preset range or not, mainly according to the detected exhaust pressure PkAnd suction pressure PoWhether the corresponding pressure coordinate point is in the first function area 1 in the compressor operation pressure range diagram shown in fig. 4, if yes, the exhaust pressure P of the air conditioner is determinedkAnd suction pressure PoIf not, the exhaust pressure P of the air conditioner is judgedkAnd suction pressure PoOutside the corresponding preset range.
If not, go to step S30;
s30: adjusting the operating frequency of the compressor to discharge the discharge pressure PkAnd said suction pressure PoLimiting the range to a corresponding preset range;
when the discharge pressure P of the air conditioner is determinedkAnd suction pressure PoWhen the pressure is out of the corresponding preset range, the discharge pressure P of the compressor is required to be influenced to avoid the influence on the service life and the running stability of the compressor caused by the long-term running of the compressor out of the normal running pressure rangekAnd suction pressure PoAnd (6) carrying out adjustment. Due to the discharge pressure PkAnd suction pressure PoThe pressure P of the exhaust gas is adjusted by adjusting the operating frequency of the compressorkAnd suction pressure PoThe pressure is limited in a corresponding preset range, the compressor is guaranteed to operate in a normal operation pressure range, and the service life and the operation stability of the compressor are guaranteed.
If yes, go to step S40;
s40: and controlling the compressor to continuously operate according to the current control logic.
Wherein the first preset time length is greater than the second preset time length.
When the discharge pressure P of the air conditioner is determinedkAnd suction pressure PoAnd when the air conditioner is in the corresponding preset range, judging that the air conditioner normally operates, wherein the operation frequency of the compressor is not limited, and the compressor can continuously operate according to the current control logic according to the requirement of the air conditioner unit.
According to the control method of the compressor, after the compressor is started for the first preset time, the exhaust pressure and the suction pressure of the compressor are monitored, whether the detected exhaust pressure and the detected suction pressure are in the corresponding preset ranges or not is judged, and when the exhaust pressure and the suction pressure are out of the corresponding preset ranges, the operation frequency of the compressor is adjusted to limit the exhaust pressure and the suction pressure in the corresponding preset ranges, so that the compressor is guaranteed to normally operate in a normal operation pressure range. When the control method judges that the exhaust pressure and the suction pressure of the compressor are out of the corresponding preset ranges, the operation frequency of the compressor is adjusted, the exhaust pressure and the suction pressure are limited in the corresponding preset ranges, the compressor is ensured to operate in the normal operation pressure range, the damage to the compressor caused by long-term operation of the compressor out of the normal operation pressure range is avoided, the service life of the compressor is prolonged, and the operation reliability of the compressor and an air conditioner is improved.
Further, referring to fig. 5, the control method of the compressor based on the above embodiment, step S21, includes:
s211: at the suction pressure P of the compressoroDischarge pressure P of compressor as x-axiskConstructing a plane coordinate system for the y axis;
in the present embodiment, in order to further utilize the operation pressure range diagram of the compressor to the discharge pressure P of the air conditionerkAnd suction pressure PoAnd judging whether the pressure is in the corresponding preset range or not, and converting the operating pressure range diagram of the compressor into a function area in a plane coordinate system mode. In particular to the suction pressure P of the compressoroDischarge pressure P of compressor as x-axiskAnd constructing a plane coordinate system for the y axis, and correspondingly mapping the normal operating pressure of the compressor into the plane coordinate system.
S212: marking a first function region corresponding to a preset compressor operation pressure range diagram in the plane coordinate system;
when the normal operation pressure of the compressor is correspondingly mapped into the constructed plane coordinate system, the normal operation pressure point (P) of the compressor is mapped by using the function of y ═ f (x)o，Pk) Based on the function y ═ f (x), the function is marked in the plane coordinate system, and in addition, the minimum exhaust pressure P is utilizedkminExhaust pressure P is less than or equal tokNot more than the maximum exhaust pressure PkmaxMinimum suction pressure PominNot more than suction pressure PkNot more than maximum suction pressure PomaxLimiting y to [ P ]kmin，Pkmax]Limiting x to [ P ]omin，Pomax]The range of allowable compressor operation can be defined as y ═ f1(x)、y＝f2(x)、y＝f3(x) And Pkmin≤y≤Pkmax、Pomin≤x≤PomaxIs indicated, wherein y ═ f1(x)、y＝f2(x)、y＝f3(x) To match a fixed function of the allowable operating pressure range of the compressor, the fixed function indicates the allowable operating region of the compressor with y ≦ f1(x)、y≤f2(x)、y≥f3(x)、Pkmin≤y≤Pkmax、Pomin≤x≤PomaxAnd marking.
Since the compressor has a region in which the frequency increase or decrease of the compressor needs to be limited in the fixed function region, and the normal operation pressure range of the compressor needs to ensure that the compressor can normally and unrestrictedly operate in the region, y needs to be limited to Pkmin+△P，Pkmax－△P]Limiting x to [ P ]omin+△P，Pomax－△P]Discharge pressure P of the compressorkAnd suction pressure PoThe corresponding preset range can be given by y ═ f1(x)－△P、y＝f2(x)－△P、y＝f3(x) +. DELTA P and Pkmin+△P≤y≤Pkmax－△P、Pomin+△P≤x≤Pomax- [ delta ] P denotes, where [ delta ] P is 0.1 to 0.5MPa, preferably 0.2MPa, then y ═ f1(x)－△P、y＝f2(x)－△P、y＝f3(x) The value of + Δ P can also be a fixed function that matches the normal operating pressure range of the compressor, so that the first function area 1 in FIG. 4 can be scaled by y ≦ f1(x)－△P、y≤f2(x)－△P、y≥f3(x)+△P、Pkmin+△P≤y≤Pkmax－△P、Pomin+△P≤x≤Pomax-. DELTA.P denotes.
S213: the detected exhaust pressure PkAnd suction pressure PoAnd converting the pressure coordinate point into a pressure coordinate point of the plane coordinate system, and judging whether the pressure coordinate point falls into the first function area.
When the normal operation pressure range diagram of the compressor is marked as a function area in fig. 4, the discharge pressure P of the compressor can be monitored according to the monitored discharge pressure PkAnd suction pressureForce PoAnd judging whether the compressor operates in a normal operation pressure range or not according to whether the corresponding coordinate point is in the first function area or not.
Further, referring to fig. 6, the control method of the compressor based on the above embodiment, step S30, includes:
s31: when the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is positioned outside the first function area, judging whether the pressure coordinate point is positioned in a second function area;
in the present embodiment, the exhaust pressure P is monitored in real timekAnd suction pressure PoWhen the pressure judgment is carried out, if the exhaust pressure P is judgedkAnd suction pressure PoThe corresponding pressure coordinate point is outside the first function region, such as the second function region in the compressor operating pressure range diagram of fig. 4, when the operating frequency of the compressor reaches the lowest frequency or the highest frequency that allows operation. The second function region can be represented by the compressor allowable operation region and the first function region, such as when the compressor allowable operation region is represented by y ≦ f1(x)、y≤f2(x)、y≥f3(x)、Pkmin≤y≤Pkmax、Pomin≤x≤PomaxMarking that the first function area 1 is less than or equal to f by y1(x)－△P、y≤f2(x)－△P、y≥f3(x)+△P、Pkmin+△P≤y≤Pkmax－△P、Pomin+△P≤x≤PomaxWhen Δ P is labeled, the second function region can be represented by f1(x)－△P＜y≤f1(x)、f2(x)－△P＜y≤f2(x)、f3(x)＜y＜f3(x)+△P、Pkmin＜y≤Pkmin+△P、Pkmax－△P＜y＜Pkmax、Pomin＜x＜PomaxAnd marking.
If yes, go to step S32;
s32: limiting compressor up-conversion or down-conversion to discharge pressure PkAnd said suction pressure PoLimiting the range to a corresponding preset range;
when saidExhaust pressure PkAnd suction pressure PoWhen the corresponding pressure coordinate point is located in the second function region of the compressor operation pressure range diagram shown in fig. 4, the operation frequency of the compressor reaches the lowest frequency or the highest frequency allowing operation, and the compressor needs to be controlled to increase/decrease the frequency, i.e., the compressor is limited to continuously increase the operation frequency or continuously decrease the frequency, so that the discharge pressure P of the compressor can be increased or decreased by limiting the operation frequency of the compressorkAnd said suction pressure PoThe corresponding coordinate point is close to the first function region.
If not, go to step S33;
s33: and controlling the compressor to increase or decrease the frequency or triggering an alarm prompt and closing the compressor based on the current running frequency of the compressor.
When the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is located in the third function area or the fourth function area of the compressor operation pressure range diagram shown in fig. 4, the discharge pressure of the compressor is too high or the suction pressure is too low, and at this time, the compressor is not suitable for high-frequency operation, so that the discharge superheat degree is too high, and the compressor is damaged, therefore, the compressor needs to be subjected to down-conversion control, or an alarm prompt is triggered when the compressor is operated at the preset lowest frequency, and the compressor is turned off.
When the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is located in the fifth function area of the compressor operation pressure range diagram shown in fig. 4, the discharge pressure and the suction pressure of the compressor are too low, and at this time, the compressor is not suitable for low-frequency operation, so that the compressor is damaged by liquid impact, and therefore the compressor needs to be subjected to frequency-up control, or an alarm prompt is triggered when the compressor is operated at the preset highest frequency, and the compressor is turned off.
Further, referring to fig. 7, the first embodiment of step S32 based on the control method of the compressor of the above embodiment includes:
s321: when the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is located in the second function area, the compressor is obtainedThe current operating frequency of the motor;
in the present embodiment, with further reference to FIG. 4, when compressor discharge pressure P is monitoredkAnd suction pressure PoCorresponding pressure coordinate point (P)o，Pk) At the second function region 2, i.e. at the exhaust pressure PkAnd suction pressure PoThe corresponding function y ═ f (x), satisfies: f. of1(x)－△P＜y≤f1(x)、f2(x)－△P＜y≤f2(x)、f3(x)＜y＜f3(x)+△P、Pkmin＜y≤Pkmin+△P、Pkmax－△P＜y＜Pkmax、Pomin＜x＜Pomax. In order to accurately control the compressor to perform frequency up-limiting or frequency down-limiting, the current operating frequency of the compressor needs to be further acquired.
S322: when the current operating frequency reaches a preset minimum frequency, limiting the compressor to reduce the frequency so as to discharge the pressure PkAnd said suction pressure PoLimiting the range to a corresponding preset range;
s323: limiting the compressor frequency increase to enable the discharge pressure P when the current operation frequency reaches a preset maximum frequencykAnd said suction pressure PoLimited to the corresponding preset range.
When the operating frequency of the compressor reaches the lowest frequency allowed to operate, namely the preset lowest frequency, the frequency-limiting control needs to be carried out on the compressor, namely the compressor is limited to continue to reduce the frequency; when the operating frequency of the compressor reaches the maximum frequency allowed to operate, namely the preset maximum frequency, the frequency-limited raising control needs to be carried out on the compressor, namely the compressor is limited to continue raising the frequency; limiting the compressor to continue increasing or decreasing frequency to increase the discharge pressure P of the compressorkAnd said suction pressure PoThe corresponding coordinate point is close to the first function region.
Further, referring to fig. 8, the second embodiment of step S32 based on the control method of the compressor of the above embodiment includes:
s324: when the exhaust pressure P iskAnd suction pressure PoCorresponding toWhen the pressure coordinate point is located in the second function area, determining the position of the pressure coordinate point in the second function area;
in the present embodiment, with further reference to FIG. 4, when compressor discharge pressure P is monitoredkAnd suction pressure PoCorresponding pressure coordinate point (P)o，Pk) At the second function region, i.e. at the exhaust pressure PkAnd suction pressure PoThe corresponding function y ═ f (x), satisfies: f. of1(x)－△P＜y≤f1(x)、f2(x)－△P＜y≤f2(x)、f3(x)＜y＜f3(x)+△P、Pkmin＜y≤Pkmin+△P、Pkmax－△P＜y＜Pkmax、Pomin＜x＜Pomax. In order to accurately control the compressor to perform frequency up-limiting or frequency down-limiting, the position of the pressure coordinate point in the second function region, that is, whether the pressure coordinate point is located in the first region or the second region in the second function region, needs to be further determined.
S325: limiting compressor boost frequency to set the discharge pressure P when the pressure coordinate point is in a first region within a second function regionkAnd said suction pressure PoLimiting the range to a corresponding preset range;
with further reference to fig. 4, the first region of the second function region may be represented as the following function based on the third function region and the fourth function region, namely: f. of1(Pomin)＜y＜f1(Pomin+△P)，f1(x)－△P＜y＜f1(x)、x∈(Pomin，f1 -1(Pkmax))，Pkmax－△P＜y＜Pkmax、x∈(f1 -1(Pkmax)，f2 -1(Pkmax))，f2(x)－△P＜y＜f2(x)、x∈(f2 -1(Pkmax)，Pomax)). When the pressure coordinate point (P)o，Pk) Limiting the compressor raising frequency when the compressor is positioned in the first area of the second function area so as to enable the discharge pressure P of the compressor to be increasedkAnd said suction pressure PoLimited to the corresponding preset range.
S326: when the pressure coordinate point is located in a second area in a second function area, limiting the compressor to reduce the frequency to enable the exhaust pressure PkAnd said suction pressure PoLimited to the corresponding preset range.
With further reference to fig. 4, the first region of the second function region may be represented as the following function based on the third function region and the fourth function region, namely: f. of3(x)+△P＜y＜f3(x)、x∈(f3 -1(Pkmin)，Pomax)，Pkmin＜y＜Pkmin+△P、x∈(Pomin+△P，f3 -1(Pkmin))，f2(Pomax)＜y＜f2(Pomax－△P)、x∈(Pomax－△P，Pomax)). When the pressure coordinate point (P)o，Pk) When the compressor is positioned in the second area of the second function area, the frequency of the compressor is limited to reduce so as to discharge the pressure P of the compressorkAnd said suction pressure PoLimited to the corresponding preset range.
Further, referring to fig. 9, the first embodiment of step S33 based on the control method of the compressor of the above embodiment includes:
s331: when the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is located in a third function area outside the second function area, judging whether the current operating frequency of the compressor is greater than a preset lowest frequency;
in this embodiment, with further reference to FIG. 4, when the discharge pressure P of the compressor is monitoredkAnd suction pressure PoCorresponding pressure coordinate point (P)o，Pk) At the third function region, i.e. at the exhaust pressure PkAnd suction pressure PoThe corresponding function y ═ f (x), satisfies: y is less than or equal to f1(Pomin)、x∈(0，Pomin). In order to accurately control the compressor to reduce the frequency or give an alarm prompt and close the compressor so as to ensure the service life and the running stability of the compressor, the method obtainsAnd taking the current operating frequency of the compressor, and comparing the current operating frequency with a preset lowest frequency to control the compressor to reduce the frequency or trigger an alarm prompt according to a comparison result.
If yes, go to step S332;
s332: controlling the compressor to reduce the frequency by a first preset amplitude for a third preset time at intervals of a second preset time until the pressure coordinate point does not belong to the third function area or the operating frequency of the compressor is reduced to a preset lowest frequency;
when the discharge pressure P of the compressorkAnd suction pressure PoCorresponding pressure coordinate point (P)o，Pk) In the third function region, the suction pressure of the compressor is considered to be too low, and the frequency of the compressor needs to be reduced. Therefore, when the current running frequency of the compressor is greater than the preset lowest frequency, the compressor is controlled to carry out frequency reduction at the first preset amplitude for a third preset time period, and the exhaust pressure P of the compressor is restarted after the first preset time periodkAnd suction pressure PoAnd judging whether the current time is within the corresponding preset range. If the discharge pressure P of the compressorkAnd suction pressure PoCorresponding pressure coordinate point (P)o，Pk) If the compressor is still located in the third function area, repeatedly controlling the compressor to continuously reduce the frequency at the first preset amplitude for a third preset time; if the running frequency of the compressor is reduced to the preset lowest frequency, the exhaust pressure P of the compressorkAnd suction pressure PoCorresponding pressure coordinate point (P)o，Pk) And if the compressor is still located in the third function area, triggering a compressor suction low pressure alarm prompt and turning off the compressor. The second preset time is 30-90 seconds, preferably 60 seconds; the third preset time is 2 seconds to 7 seconds, preferably 5 seconds; the first preset amplitude is 1 Hz/s-3 Hz/s, and preferably 1 Hz/s.
If not, go to step S333;
s333: triggering an inspiration low-pressure alarm prompt and closing the compressor;
and the third preset time length is less than the second preset time length and less than the first preset time length.
When the discharge pressure P of the compressorkAnd suction pressure PoCorresponding pressure coordinate point (P)o，Pk) In the third function region, the suction pressure of the compressor is considered to be too low, and the frequency of the compressor needs to be reduced. However, when the current operating frequency of the compressor is the preset lowest frequency, the frequency of the compressor cannot be reduced, and the compressor is out of the normal operating pressure range at the moment, so that the compressor is prevented from being damaged, the service life and the operating stability of the compressor are guaranteed, the air suction low-pressure alarm prompt of the compressor is triggered, and the compressor is turned off.
Further, referring to fig. 10, the second embodiment of step S33 based on the control method of the compressor of the above embodiment includes:
s334: when the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is located in a fourth function area outside the second function area, judging whether the current operating frequency of the compressor is greater than a preset lowest frequency;
in this embodiment, with further reference to FIG. 4, when the discharge pressure P of the compressor is monitoredkAnd suction pressure PoCorresponding pressure coordinate point (P)o，Pk) At the fourth function region, i.e. at the exhaust pressure PkAnd suction pressure PoThe corresponding function y ═ f (x), satisfies: y > f1(Pomin)、x∈(0，Pomin)，y＞f1(x)、x∈[Pomin，f1 -1(Pkmax))，y＞Pkmax、x∈[f1 -1(Pkmax)，f2 -1(Pkmax))，y＞f2(x)、x∈[f2 -1(Pkmax)，Pomax)，y≥f2(Pomax)、x∈[PomaxAnd ∞). In order to accurately control the compressor to reduce the frequency or give an alarm prompt and close the compressor so as to ensure the service life and the running stability of the compressor, the current running frequency of the compressor is obtained and compared with the preset lowest frequency so as to control the pressure according to the comparison resultThe compressor reduces the frequency or triggers an alarm prompt.
If yes, go to step S335;
s335: controlling the compressor to reduce the frequency by a second preset amplitude for a fifth preset time at every fourth preset time interval until the pressure coordinate point does not belong to the fourth function area or the operating frequency of the compressor is reduced to a preset lowest frequency;
when the discharge pressure P of the compressorkAnd suction pressure PoCorresponding pressure coordinate point (P)o，Pk) When the compressor is located in the fourth function region, the discharge pressure of the compressor is considered to be too high at this time, and the frequency of the compressor needs to be reduced. Therefore, when the current running frequency of the compressor is greater than the preset lowest frequency, the compressor is controlled to carry out frequency reduction at the second preset amplitude for a fifth preset time period, and the exhaust pressure P of the compressor is restarted after the fourth preset time periodkAnd suction pressure PoAnd judging whether the current time is within the corresponding preset range. If the discharge pressure P of the compressorkAnd suction pressure PoCorresponding pressure coordinate point (P)o，Pk) If the compressor is still located in the fourth function area, repeatedly controlling the compressor to continuously reduce the frequency at the second preset amplitude for a fifth preset time; if the running frequency of the compressor is reduced to the preset lowest frequency, the exhaust pressure P of the compressorkAnd suction pressure PoCorresponding pressure coordinate point (P)o，Pk) And if the compressor is still located in the fourth function area, triggering a compressor exhaust high pressure alarm prompt and turning off the compressor. The fourth preset time is 30-90 seconds, preferably 60 seconds; the fifth preset time is 2 seconds to 7 seconds, preferably 5 seconds; the second preset amplitude is 1 Hz/s-3 Hz/s, preferably 1 Hz/s.
If not, go to step S336;
s336: triggering an exhaust high-pressure alarm prompt and closing the compressor;
wherein the fifth preset time length is less than the fourth preset time length is less than the first preset time length.
When the discharge pressure P of the compressorkAnd suction pressure PoCorresponding pressure coordinate point (P)o，Pk) When the compressor is located in the fourth function region, the discharge pressure of the compressor is considered to be too high at this time, and the frequency of the compressor needs to be reduced. However, when the current operating frequency of the compressor is the preset lowest frequency, the frequency of the compressor cannot be reduced, and the compressor is out of the normal operating pressure range at the moment, so that the compressor is prevented from being damaged, the service life and the operating stability of the compressor are ensured, the exhaust high-pressure alarm prompt of the compressor is triggered, and the compressor is turned off.
Further, referring to fig. 11, the third embodiment of the step S33 based on the control method of the compressor of the above embodiment includes:
s337: when the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is located in a fifth function area outside the second function area, judging whether the current operating frequency of the compressor is less than the preset highest frequency;
in this embodiment, with further reference to FIG. 4, when the discharge pressure P of the compressor is monitoredkAnd suction pressure PoCorresponding pressure coordinate point (P)o，Pk) At the fifth function region, i.e. at the exhaust pressure PkAnd suction pressure PoThe corresponding function y ═ f (x), satisfies: y is less than Pkmin、x∈[Pomin，f3 -1(Pkmin)))，y＜f3(x)、x∈[f3 -1(Pkmin)，Pomax)，y＜f2(Pomax)、x∈[PomaxAnd ∞). In order to accurately control the compressor to carry out frequency reduction or give an alarm prompt and close the compressor so as to ensure the service life and the running stability of the compressor, the current running frequency of the compressor is obtained and compared with the preset highest frequency so as to control the compressor to carry out frequency reduction or trigger the alarm prompt according to the comparison result.
If yes, go to step S338;
s338: controlling the compressor to increase the frequency by a third preset amplitude for a seventh preset time period every sixth preset time period until the pressure coordinate point does not belong to the fifth function area or the operating frequency of the compressor is increased to a preset maximum frequency;
when the discharge pressure P of the compressorkAnd suction pressure PoCorresponding pressure coordinate point (P)o，Pk) In the fifth function region, it can be considered that the discharge pressure of the compressor is too low or the suction pressure is too high, and the frequency of the compressor needs to be increased. Therefore, when the current running frequency of the compressor is less than the preset highest frequency, the compressor is controlled to carry out frequency increasing at a third preset amplitude for a seventh preset time period, and the exhaust pressure P of the compressor is restarted after the sixth preset time periodkAnd suction pressure PoAnd judging whether the current time is within the corresponding preset range. If the discharge pressure P of the compressorkAnd suction pressure PoCorresponding pressure coordinate point (P)o，Pk) If the compressor is still located in the fifth function area, repeatedly controlling the compressor to continuously reduce the frequency at the third preset amplitude for a seventh preset time; if the running frequency of the compressor is increased to the preset maximum frequency, the exhaust pressure P of the compressorkAnd suction pressure PoCorresponding pressure coordinate point (P)o，Pk) Still in the fifth function area, the current suction pressure P is further comparedoWith a preset maximum suction pressure PomaxAccording to the comparison result, the alarm prompt of the high air suction pressure or the low air discharge pressure of the compressor is triggered, and the compressor is turned off. The sixth preset time is 30 seconds to 90 seconds, preferably 60 seconds; the seventh preset time is 2 seconds to 7 seconds, preferably 5 seconds; the third preset amplitude is 1 Hz/s-3 Hz/s, preferably 1 Hz/s.
If not, go to step S339;
s339: at Po＞PomaxTime-triggered inspiration high-pressure alarm prompt and compressor off, or at Po≤PomaxTriggering an exhaust low-pressure alarm prompt and closing the compressor;
wherein the seventh preset time is longer than the sixth preset time and is shorter than the first preset time, PomaxA preset maximum suction pressure.
When the discharge pressure P of the compressorkAnd suction pressure PoCorresponding pressure coordinate point (P)o，Pk) In the fifth function region, it can be considered that the discharge pressure of the compressor is too low or the suction pressure is too high, and the frequency of the compressor needs to be increased. However, when the current operating frequency of the compressor is the preset highest frequency, the compressor cannot be increased again, and the compressor is outside the normal operating pressure range at the moment, so that the current suction pressure P needs to be further compared to avoid damaging the compressor and guarantee the service life and the operating stability of the compressoroWith a preset maximum suction pressure PomaxAccording to the comparison result, the alarm prompt of the high air suction pressure or the low air discharge pressure of the compressor is triggered, and the compressor is turned off. The method specifically comprises the following steps: when P is presento＞PomaxTriggering an inspiration high-pressure alarm prompt and closing the compressor; when P is presento≤PomaxAnd triggering an exhaust low-pressure alarm prompt and closing the compressor.
Furthermore, an embodiment of the present invention further provides a storage medium, in which a control program is stored, and the control program implements the steps of the control method of the compressor as described above when executed by a processor.
The method implemented when the control program is executed can refer to the embodiments of the control method of the compressor of the present invention, and is not described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system 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 system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (11)
1. A control method of a compressor, characterized by comprising the steps of:
monitoring the exhaust pressure P of the compressor after the compressor is started for a first preset time periodkAnd suction pressure Po；
Judging the exhaust pressure PkAnd suction pressure PoWhether the pressure is in a corresponding preset range, wherein the preset range is the suction pressure P of the compressoroDischarge pressure P of compressor as x-axiskEstablishing a plane coordinate system for the y axis, and marking a first function area corresponding to a preset compressor operation pressure range diagram in the plane coordinate system, wherein the first function area is represented by y ≦ f1(x)－△P、y≤f2(x)－△P、y≥f3(x)+△P、Pkmin+△P≤y≤Pkmax－△P、Pomin+△P≤x≤PomaxReference DeltaP denotes the minimum exhaust pressure defined as PkminMaximum exhaust pressure of PkmaxMinimum suction pressure of PominMaximum suction pressure of PomaxThe delta P is 0.1-0.5MPa, and y is equal tof1(x)、y＝f2(x) And y ═ f3(x) A fixed function to match the allowable operating pressure range of the compressor;
if not, adjusting the running frequency of the compressor to discharge the pressure PkAnd said suction pressure PoLimited to the corresponding first function region.
2. The control method according to claim 1, characterized in that the determination of the exhaust pressure PkAnd suction pressure PoWhether the current time is within the corresponding preset range or not comprises the following steps:
the detected exhaust pressure PkAnd suction pressure PoAnd converting the pressure coordinate point into a pressure coordinate point of the plane coordinate system, and judging whether the pressure coordinate point falls into the first function area.
3. The control method of claim 2, wherein if not, adjusting an operating frequency of a compressor to discharge the pressure PkAnd said suction pressure PoThe step of limiting to the corresponding first function area comprises:
when the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is positioned outside the first function area, judging whether the pressure coordinate point is positioned in a second function area;
if yes, limiting the frequency increasing or reducing of the compressor to increase or decrease the exhaust pressure PkAnd said suction pressure PoLimiting the range to a corresponding preset range;
if not, controlling the compressor to increase or decrease the frequency based on the current running frequency of the compressor, or triggering an alarm prompt and closing the compressor.
4. A control method as claimed in claim 3, characterized in that if so, the compressor is limited to upshifting or downshifting in order to bring the discharge pressure PkAnd said suction pressure PoLimiting to a corresponding preset range, comprising:
when the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is located in the second function area, acquiring the current operating frequency of the compressor;
when the current operating frequency reaches a preset minimum frequency, limiting the compressor to reduce the frequency so as to discharge the pressure PkAnd said suction pressure PoLimiting the range to a corresponding preset range;
limiting the compressor frequency increase to enable the discharge pressure P when the current operation frequency reaches a preset maximum frequencykAnd said suction pressure PoLimited to the corresponding preset range.
5. A control method as claimed in claim 3, characterized in that if so, the compressor is limited to upshifting or downshifting in order to bring the discharge pressure PkAnd said suction pressure PoLimiting to a corresponding preset range, comprising:
when the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is located in the second function area, determining the position of the pressure coordinate point in the second function area;
limiting compressor boost frequency to set the discharge pressure P when the pressure coordinate point is in a first region within a second function regionkAnd said suction pressure PoLimiting the range to a corresponding preset range;
when the pressure coordinate point is located in a second area in a second function area, limiting the compressor to reduce the frequency to enable the exhaust pressure PkAnd said suction pressure PoLimited to the corresponding preset range.
6. The control method of claim 3, wherein if not, the step of controlling the compressor to increase or decrease frequency based on the current operating frequency of the compressor, or turning off the compressor after triggering an alarm prompt, comprises:
when the exhaust pressure P iskAnd suction pressure PoA third pressure coordinate point outside the second function regionWhen the function area is in, judging whether the current running frequency of the compressor is greater than the preset lowest frequency;
if so, controlling the compressor to reduce the frequency by a first preset amplitude for a third preset time at intervals of a second preset time until the pressure coordinate point does not belong to the third function area or the operating frequency of the compressor is reduced to a preset lowest frequency;
if not, triggering an inspiration low-pressure alarm prompt and closing the compressor;
and the third preset time length is less than the second preset time length and less than the first preset time length.
7. The control method of claim 3, wherein if not, the step of controlling the compressor to increase or decrease frequency based on the current operating frequency of the compressor, or turning off the compressor after triggering an alarm prompt, comprises:
when the exhaust pressure P iskAnd suction pressure PoWhen the corresponding pressure coordinate point is located in a fourth function area outside the second function area, judging whether the current operating frequency of the compressor is greater than a preset lowest frequency;
if so, controlling the compressor to reduce the frequency by a second preset amplitude for a fifth preset time at intervals of a fourth preset time until the pressure coordinate point does not belong to the fourth function area or the operating frequency of the compressor is reduced to a preset lowest frequency;
if not, triggering an exhaust high-pressure alarm prompt and closing the compressor;
wherein the fifth preset time length is less than the fourth preset time length is less than the first preset time length.
8. The control method of claim 3, wherein if not, the step of controlling the compressor to increase or decrease frequency based on the current operating frequency of the compressor, or turning off the compressor after triggering an alarm prompt, comprises:
when the exhaust pressure P iskAnd suction pressure PoA fifth function region with corresponding pressure coordinate points outside the second function regionJudging whether the current running frequency of the compressor is less than the preset highest frequency or not;
if so, controlling the compressor to increase the frequency by a third preset amplitude for a seventh preset time at intervals of a sixth preset time until the pressure coordinate point does not belong to the fifth function area or the operating frequency of the compressor is increased to a preset maximum frequency;
if not, then at Po＞PomaxTime-triggered inspiration high-pressure alarm prompt and compressor off, or at Po≤PomaxTriggering an exhaust low-pressure alarm prompt and closing the compressor;
wherein the seventh preset time is longer than the sixth preset time and is shorter than the first preset time, PomaxIs the maximum suction pressure.
9. A control method according to claim 1, characterized in that when the discharge pressure P of the compressor is exceededkAnd suction pressure PoAnd when the current function zone is located, controlling the compressor to continuously operate according to the current control logic.
10. An air conditioner comprising a compressor, characterized in that it further comprises a memory, a processor and a control program stored in said memory and executable on said processor, said control program, when executed by said processor, implementing the steps of the control method of the compressor according to any one of claims 1 to 9.
11. A storage medium, characterized in that it stores a control program which, when executed by a processor, implements the steps of a control method of a compressor according to any one of claims 1 to 9.
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| CN109751708A (en) * | 2018-12-27 | 2019-05-14 | 广东美的暖通设备有限公司 | The control method and storage medium of a kind of air conditioner, air conditioner |
| CN109855337A (en) * | 2019-02-18 | 2019-06-07 | 珠海格力电器股份有限公司 | A kind of Differential pressure control method, device and the equipment of effective protection compressor |
| CN112664455B (en) * | 2019-10-15 | 2023-02-21 | 广东芬尼克兹节能设备有限公司 | Lubrication adjusting method and device for compressor, electronic equipment and storage medium |
| CN111023420B (en) * | 2019-12-27 | 2021-08-20 | 宁波奥克斯电气股份有限公司 | Compressor quick start control method and device, air conditioner and storage medium |
| CN111023430A (en) * | 2019-12-31 | 2020-04-17 | 宁波奥克斯电气股份有限公司 | Compressor starting control method and device and air conditioner |
| CN111561768B (en) * | 2020-05-06 | 2021-12-14 | 广东美的暖通设备有限公司 | Operation control method of air conditioner, air conditioner and readable storage medium |
| CN113007862B (en) * | 2021-04-20 | 2022-07-12 | 宁波奥克斯电气股份有限公司 | Air suction side pressure determining method and module, air conditioner control method and device and multi-split air conditioner |
| CN113432353B (en) * | 2021-06-15 | 2022-08-23 | 广东芬尼克兹节能设备有限公司 | Compression ratio adjusting method, compression ratio adjusting device, compression ratio adjusting equipment and storage medium |
| CN115183304B (en) * | 2022-07-14 | 2024-04-02 | 珠海格力电器股份有限公司 | Control method and system for capillary network air conditioner heating system |
| CN115325630A (en) * | 2022-07-26 | 2022-11-11 | 南京天加环境科技有限公司 | Control method of refrigerating system |
| CN116292238B (en) * | 2023-05-17 | 2023-09-12 | 广东美的暖通设备有限公司 | Control method and device of working frequency, storage medium and electronic equipment |
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| KR100557039B1 (en) * | 2003-10-16 | 2006-03-03 | 엘지전자 주식회사 | The method for control of airconditioner |
| JP2005061698A (en) * | 2003-08-11 | 2005-03-10 | Mitsubishi Heavy Ind Ltd | Refrigerator, refrigerating unit using this refrigerator and container with refrigerating unit |
| CN106642806B (en) * | 2016-10-31 | 2019-01-15 | 珠海格力电器股份有限公司 | For controlling the control method and heat pump unit of the operation of compressor |
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