CN114001449A

CN114001449A - Control method and device of air conditioning equipment, readable storage medium and air conditioning equipment

Info

Publication number: CN114001449A
Application number: CN202111239853.7A
Authority: CN
Inventors: 刘金霖
Original assignee: GD Midea Heating and Ventilating Equipment Co Ltd; Hefei Midea Heating and Ventilating Equipment Co Ltd
Current assignee: GD Midea Heating and Ventilating Equipment Co Ltd; Hefei Midea Heating and Ventilating Equipment Co Ltd
Priority date: 2021-10-25
Filing date: 2021-10-25
Publication date: 2022-02-01
Anticipated expiration: 2041-10-25
Also published as: CN114001449B

Abstract

The invention provides a control method and a control device of air conditioning equipment, a readable storage medium and the air conditioning equipment, wherein the control method comprises the following steps: acquiring the current opening degree of the electronic expansion valve; collecting an inlet pressure value and an outlet pressure value of the pump; determining a pressure difference between the inlet pressure value and the outlet pressure value; the current opening degree of the electronic expansion valve is adjusted according to the pressure difference value, and by operating the control method, the noise in the operation process of the air conditioning equipment can be reduced, and meanwhile, the operation stability of the air conditioning equipment is improved.

Description

Control method and device of air conditioning equipment, readable storage medium and air conditioning equipment

Technical Field

The invention relates to the technical field of control, in particular to a control method and device of air conditioning equipment, a readable storage medium and the air conditioning equipment.

Background

The natural cold source is utilized to cool the high-temperature low-pressure gaseous refrigerant from the evaporator to the low-temperature low-pressure liquid state, and the compressor can be prevented from compressing the refrigerant, so that the method has the advantages of high energy efficiency, low cost, simple process and the like.

Those skilled in the art find that the air conditioning equipment adopting the principle has the problems of high noise and low reliability.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art or the related art.

To this end, a first aspect of the present invention is to provide a control method of an air conditioning apparatus.

A second aspect of the present invention is to provide a control apparatus for an air conditioning apparatus.

A third aspect of the present invention is to provide a control apparatus for an air conditioning apparatus.

A fourth aspect of the present invention is to provide a readable storage medium.

A fifth aspect of the present invention is to provide an air conditioning apparatus.

In view of the above, according to a first aspect of the present invention, there is provided a control method of an air conditioning apparatus, wherein the air conditioning apparatus includes a pump and an electronic expansion valve, the control method comprising: acquiring the current opening degree of the electronic expansion valve; collecting an inlet pressure value and an outlet pressure value of the pump; determining a pressure difference between the inlet pressure value and the outlet pressure value; and adjusting the current opening degree of the electronic expansion valve according to the pressure difference value.

The technical scheme of the application provides a control scheme of the air conditioning equipment, and by operating the control method, the noise in the operation process of the air conditioning equipment can be reduced, and meanwhile, the stability of the operation of the air conditioning equipment is improved.

The technical scheme of the application is realized by the following principle.

The air conditioning equipment with high noise and low reliability is detected, and the reason that the air conditioning equipment with high noise and low reliability is found to be that the inlet and outlet pressure difference of the pump does not operate in a reliable operation range.

At present, the existing air conditioning equipment adopts an electronic expansion valve with a fixed opening degree to realize the control of a refrigerant, under the normal use condition of the air conditioning equipment, the unadjustable electronic expansion valve can ensure that the pressure difference between an inlet and an outlet of a pump machine operates in a reliable operation range, and when the air conditioning equipment has a longer long connecting pipe and has lower outdoor use requirements, the unadjustable opening degree of the electronic expansion valve can not ensure that the pressure difference between the inlet and the outlet of the pump machine operates in the reliable operation range, so that the air conditioning equipment generates larger noise in the operation process.

The technical scheme of this application is from the source that appears the noise, also promptly, the business turn over pressure differential based on the pump machine does not operate at reliable operation scope, and is adjustable through the aperture of injecing electronic expansion valve to when utilizing electronic expansion valve to adjust the pump machine operation, the pressure differential value of refrigerant import and export, so that with its control in reliable operation scope, thereby the production of noise when having restrained air conditioning equipment operation, simultaneously, guaranteed the stability of air conditioning equipment operation.

Specifically, according to the technical scheme of the application, the pressure sensors are respectively arranged at the inlet and the outlet of the pump, so that the pressure sensors are used for acquiring the pressure of the refrigerant at the corresponding position, after the inlet pressure value and the outlet pressure value of the pump are acquired, the difference value between the inlet pressure value and the outlet pressure value is calculated and used as the pressure difference value, the current opening degree of the electronic expansion valve is adjusted according to the pressure difference value, and the pressure difference between the inlet and the outlet of the pump after adjustment is within a reliable operation range.

In the technical scheme, the pressure difference between the inlet and the outlet of the pump is in a reliable operation range under the condition that the working condition of the air conditioning equipment is changed and the pipe diameter of the long connecting pipe is changed.

In addition, the control method of the air conditioning equipment provided by the application also has the following additional technical characteristics.

In one technical solution, adjusting a current opening degree of an electronic expansion valve according to a pressure difference value includes: acquiring a pressure setting difference value and a fluctuation value; determining a first deviation value according to the pressure difference value, the pressure setting difference value and the fluctuation value; acquiring historical adjustment information and an adjustment period of the electronic expansion valve, wherein the historical adjustment information comprises a second deviation value and a third deviation value; determining an adjustment step length according to a proportional coefficient of the pressure difference value, an integral time constant of the pressure difference value, a differential time constant of the pressure difference value, a first deviation value, a second deviation value, a third deviation value and an adjustment period; and adjusting the current opening according to the adjustment step length.

In the technical scheme, how to adjust the current opening degree according to the pressure difference value is limited, and in the process, the adjustment step length is determined according to the pressure difference value so as to adjust the current opening degree according to the adjustment step length.

In the process, the adjustment step length is based on the pressure difference, so that the adjusted opening degree is ensured to be matched with the inlet and outlet pressure difference of the pump, and the influence of the unmatched opening degree of the electronic expansion valve and the inlet and outlet pressure difference of the pump on the operation of the air conditioning equipment is reduced.

Specifically, the pressure setting difference can be understood as a target value to be reached by the set pressure difference between the inlet and the outlet of the pump during the operation of the air conditioning equipment.

In one of the technical solutions, the pressure setting difference may be set according to an equipment parameter of the air conditioning equipment, wherein the equipment parameter may be a length of the long connecting pipe.

In one of the technical solutions, the pressure setting difference may be set according to a limit operation condition of the air conditioning equipment, where the limit operation condition may include a limit operation temperature, such as minus 40 ℃.

In the above technical solution, the fluctuation value can be understood as the amplitude of fluctuation of the pressure setting difference value under the actual operation condition, and the value thereof can be set according to the equipment parameter of the air conditioning equipment, wherein the equipment parameter can be the length of the long connecting pipe. And the air conditioner can also be set according to the limit operation condition of the air conditioner.

In the above technical solution, the combination of the pressure setting difference and the fluctuation value can obtain a reliable operation range in which the pressure difference between the inlet and the outlet of the pump is located during the operation of the air conditioning equipment, specifically, the reliable operation range is [ the difference between the pressure setting difference and the fluctuation value, and the sum of the pressure setting difference and the fluctuation value ].

In one of the technical solutions, the adjustment period is a time interval between two times of adjusting the opening degree, and in one of the technical solutions, a value of the adjustment period is between 5 seconds and 300 seconds, and further, the value includes an end position, that is, the value of the adjustment period may be 5 seconds or 300 seconds.

In one of the technical solutions, the adjustment period is selected as default for 10 seconds.

In one of the technical solutions, the history adjustment information includes a deviation value corresponding to a pressure difference value of an inlet and an outlet of the pump during the history adjustment process of the electronic expansion valve, and in the technical solution of the present application, the second deviation value and the third deviation value are respectively a deviation value determined according to the pressure difference value of the inlet and the outlet, the pressure setting difference value, and the fluctuation value when the opening degree of the electronic expansion valve is adjusted last time.

In other words, the second deviation value and the third deviation value are deviation values determined according to the pressure difference value at the inlet and the outlet, the pressure setting difference value, and the fluctuation value when the opening degree of the electronic expansion valve is adjusted last two times.

In the above technical solution, the proportional coefficient of the pressure difference is represented by a proportional coefficient, the integral time constant of the pressure difference is represented by an integral time constant, and the differential time constant of the pressure difference is represented by a differential time constant, which is a constant.

In one of the technical solutions, the scale factor has a value range of 0.1 to 10, and the specific value includes an endpoint value, for example, the scale factor is selected to be 0.1, or the scale factor is selected to be 10.

In one of the technical solutions, the scale factor is selected to be 2.0 by default.

In one of the technical solutions, the value range of the integration time constant is between 1 and 999, and the specific value includes an endpoint value, for example, the integration time constant is selected to be 1, or the integration time constant is selected to be 999.

In one embodiment, the integration time constant is selected by default to 60 seconds.

In one of the technical solutions, the value range of the differential time constant is from 0 to 999, and the specific value thereof includes an endpoint value, for example, the differential time constant is selected to be 0, or the differential time constant is selected to be 999.

In one embodiment, the derivative time constant is chosen to be 60 seconds by default.

In any of the above technical solutions, determining the adjustment step size based on the above parameters follows the following formula:

u(t)＝Ratio_eevscale×[e(t)-e(t-1)]+Ratio_eevscale×

(Time_eevmeasure/Time_eevintegral)×e(t)+Ratio_eevscale×

(Time_eevdifftial/Time_eevmeasure)×[e(t)-2e(t-1)+e(t-2)]。

wherein u (t) represents an adjustment step length during the current opening degree adjustment, Ratio _ eevscale represents a proportionality coefficient, e (t) represents a first deviation value corresponding to the Time t, e (t-1) represents a deviation value during the last opening degree adjustment, namely, a deviation value corresponding to the Time t-1, and is recorded as a second deviation value, Time _ eevmeas represents an adjustment period, Time _ eevintgall represents an integral Time constant, Time _ eevmdifferential represents a differential Time constant, and e (t-2) represents a deviation value during the last opening degree adjustment, namely, a deviation value corresponding to the Time t-2 is recorded as a third deviation value.

In one of the technical solutions, determining the first deviation value according to the pressure difference value, the pressure setting difference value, and the fluctuation value includes: based on the pressure difference being greater than a first sum of the pressure set difference and the fluctuation value, the first deviation value being a difference between the pressure difference and the first sum; based on the pressure difference being less than a first difference between the pressure set difference and the fluctuation value, the first deviation value being a difference between the first difference and the pressure difference; the first deviation value is zero based on the pressure difference value being greater than or equal to the first difference value and less than or equal to the first sum value.

In this solution, a determination of the first deviation value is defined, in particular, as indicated above: e (t) represents the first deviation value corresponding to the time t, and the determination of the first deviation value e (t) follows the following scheme:

when P3(t) > P3set + P3 debizone, e (t) ═ P3(t) -P3set-P3 debizone;

when P3(t) < P3set-P3 debizone, e (t) ═ P3set-P3 debizone-P3 (t);

when P3set-P3 debizone is not more than P3(t) not more than P3set + P3 debizone, e (t) is 0.

Wherein P3(t) is the inlet and outlet pressure difference of the pump measured at time t, P3set is the pressure setting difference, and P3deadzone is the fluctuation value.

In one of the technical solutions, the method further includes: acquiring an adjustment step length threshold of the electronic expansion valve; and adjusting the current opening according to the adjustment step threshold on the basis that the adjustment step is not lower than the adjustment step threshold.

In the technical scheme, in the process of adjusting the current opening according to the adjustment step length, the adjustment step length is compared with an adjustment step length threshold value so as to judge whether the adjustment step length is reasonable, and the current opening is adjusted according to the adjustment step length only under the condition that the adjustment step length belongs to the reasonable step length.

According to the technical scheme, under the condition that the adjustment step length is larger than or equal to the adjustment step length threshold value, the current opening degree is adjusted by the adjustment step length threshold value, and through the limitation, the phenomenon that the air conditioning equipment is strongly fluctuated due to the fact that the adjustment amplitude of the single opening degree is too large and the operation stability of the air conditioning equipment is influenced is avoided.

In one of the technical solutions, considering that the calculated adjustment step may be a negative value, when the adjustment step is greater than or equal to the adjustment step threshold, the current opening degree is adjusted by using the adjustment step threshold, and when the absolute value of the adjustment step is greater than or equal to the adjustment step threshold, the current opening degree is adjusted by using the adjustment step threshold, so as to ensure the stability of the air conditioning equipment and reduce the possibility of strong fluctuation of the air conditioning system.

In any of the above technical solutions, the value of the adjustment step threshold is related to the opening degree of the electronic expansion valve, and specifically, the value of the adjustment step threshold follows the following scheme:

in one of the technical solutions, a value of the adjustment step threshold is a smaller value of a default step number and a first step number, where the first step number is a product of a preset coefficient and an opening of the electronic expansion valve, and specifically, the value of the preset coefficient is 0.1.

For example, the default number of steps is 24, and when the opening of the electronic expansion valve is 260 steps, the first number of steps is 0.1 × 260 — 26, in this case, the adjustment step threshold is selected as the default number of steps, that is, the adjustment step threshold is 24.

In one technical solution, when it is considered that the adjustment step size is smaller than the adjustment step size threshold, the current opening degree is adjusted according to the adjustment step size.

In any of the above technical solutions, when the adjustment step size is greater than or equal to 0.5 step and less than the minimum adjustment step size, the current opening degree is adjusted according to the minimum adjustment step size.

Specifically, when the adjustment step size is greater than or equal to 0.5 step and less than the minimum adjustment step size, the current opening degree is adjusted according to the minimum adjustment step size, and instead, when the absolute value of the adjustment step size is greater than or equal to 0.5 step and less than the minimum adjustment step size, the current opening degree is adjusted according to the minimum adjustment step size.

In one embodiment, the minimum adjustment step size may be determined according to the minimum adjustable step size of the electronic expansion valve.

In any of the above technical solutions, the default value of the minimum adjustment step size is 1.

In any of the above technical solutions, when the adjustment step size is greater than or equal to 0 step and less than 0.5 step, the adjustment step size is selected to be 0, and thus the current step size is adjusted.

Specifically, when the adjustment step size is greater than or equal to 0 step and less than 0.5 step, the adjustment step size is 0, and the current step size is adjusted accordingly, which may be replaced by selecting 0 when the absolute value of the adjustment step size is greater than or equal to 0 step and less than 0.5 step, and adjusting the current step size accordingly.

In the technical scheme, the frequency of the electronic expansion valve is avoided through the limitation, and the service life of the electronic expansion valve is further prolonged.

In one of the technical solutions, adjusting the current opening according to the adjustment step includes: and adjusting the current opening to be a target opening, wherein the target opening is the sum of the current opening and the adjustment step length.

In the technical solution, how to adjust the current opening according to the adjustment step length is defined, and in the technical solution, the target opening, that is, the adjusted opening, is a sum of the current opening and the adjustment step length.

In the scheme, the current opening degree is compensated by using the adjustment step length, so that the inlet and outlet pressure difference of the pump is in a reliable operation range.

In one technical solution, before obtaining the current opening degree of the electronic expansion valve, the method further includes: and controlling the electronic expansion valve to operate for a first time period according to the maximum opening degree.

According to the technical scheme, the electronic expansion valve is limited to operate at the maximum opening degree, the first time length is maintained, so that the air conditioning equipment can operate fully, and the phenomenon that the electronic expansion valve is adjusted at the initial starting stage of the air conditioning equipment to cause abnormal operation of the air conditioning equipment is avoided.

In any of the above technical solutions, the maximum opening degree may be understood as a maximum rated opening degree of the electronic expansion valve, for example, when the opening degree adjustment range of the electronic expansion valve is [0 step, 480 steps ], the maximum opening degree is 480 steps.

In one of the technical solutions, the method further includes: updating the pressure difference value based on the second duration of continuous operation of the pump; and adjusting the adjustment period according to the updated pressure difference value.

In the technical scheme, the adjustment frequency of the electronic expansion valve is improved by changing the adjustment period, so that the adjustment speed of the electronic expansion valve is increased, the inlet and outlet pressure difference value of the pump can be adjusted to a reliable operation interval at the highest speed, the abnormal time of the air conditioning equipment is reduced, and the reliability of the air conditioning equipment is improved.

In the above technical solution, a value of the second duration is greater than or equal to the adjustment period.

In one of the technical solutions, the second duration is 3 minutes.

In one of the technical solutions, the adjustment period is decreased when the updated pressure difference is greater than the first pressure difference, or the updated pressure difference is less than the second pressure difference.

For example, the first pressure difference may be 0.5MPa, or 0.54MPa, or 0.58MPa, and as the value of the first pressure difference increases, the adjustment range of the adjustment period increases.

For example, the second pressure difference may be 0.2MPa, or 0.16MPa, or 0.12MPa, and as the value of the second pressure difference decreases, the adjustment range of the adjustment period increases.

In one technical scheme, the air conditioning equipment is controlled to stop under the condition that the inlet pressure value or the outlet pressure value is empty.

In one of the technical solutions, that the inlet pressure value or the outlet pressure value is empty may be understood as that no inlet pressure value or no outlet pressure value is detected.

In one technical scheme, after a stop instruction is received, the pump is controlled to stop, the electronic expansion valve is controlled to be closed when the stop time of the pump is longer than the default stop time, and meanwhile, the opening degree of the electronic expansion valve is increased by 40 steps on the basis of the step number when the electronic expansion valve is closed, so that preparation can be made for the next start.

In one of the technical solutions, the method further includes: and controlling the air conditioning equipment to stop for a fifth time period based on the fact that the duration time of the pressure difference value larger than the upper limit of the pressure difference value is larger than the third time period, and outputting warning information.

In the technical scheme, a detection scheme of high-voltage protection is provided, wherein the value of the upper limit of the pressure difference value can be set according to the actual use scene of the air conditioning equipment, and the air conditioning equipment is maintained in a timing manner by outputting warning information, so that the probability of fault shutdown of the air conditioning equipment is reduced.

In one of the technical solutions, the upper limit of the pressure difference is set to 0.6MPa by default.

In one technical scheme, the value of the third duration is set according to a use scene of the air conditioning equipment, wherein the use scene can be outdoor, indoor and the like.

In one technical scheme, the third time length is selected by default to be 30 seconds.

In one embodiment, the fifth time period may be selected at will, and is not limited herein.

In one embodiment, the expression of the warning information is not limited herein.

In one of the technical solutions, the method further includes: and controlling the air conditioning equipment to stop for a fifth time period based on the fact that the duration time of the pressure difference value smaller than the lower limit of the pressure difference value is longer than the fourth time period, and outputting warning information.

In the technical scheme, a detection scheme of low-voltage protection is provided, wherein the value of the lower limit of the pressure difference value can be set according to the actual use scene of the air conditioning equipment, and the air conditioning equipment is maintained in a timing manner by outputting warning information, so that the probability of fault shutdown of the air conditioning equipment is reduced.

In one of the technical solutions, the lower limit of the pressure difference is set to 0.1MPa by default.

In one technical scheme, the value of the fourth time length is set according to a use scene of the air conditioning equipment, wherein the use scene can be outdoor, indoor and the like.

In one of the technical solutions, the fourth time length is selected by default to be 30 seconds.

In one of the technical solutions, the value of the fifth time period is 3 minutes.

In one of the technical solutions, the method further includes: and within the sixth time length, outputting locking warning information based on the fact that the number of times of statistics of the triggering warning information is larger than the preset number of times.

According to the technical scheme, the locking warning information is output so that the air conditioning equipment can be locked by using the locking warning information, and the air conditioning equipment is prevented from continuously operating under the condition that a fault exists, so that the reliability of the operation of the air conditioning equipment is improved.

In one of the technical solutions, the value of the preset times may be set by a user.

In one of the technical solutions, the default value of the preset times is 6 times.

In one of the technical solutions, a value of the sixth duration may be set by a user.

In one technical solution, the value of the sixth time period is 1 hour.

In one of the technical solutions, the method further includes: and outputting locking warning information based on the fact that the accumulated time length of the output warning information is longer than the seventh time length.

In the technical scheme, the locking warning information is limited to be output when the time for outputting the warning information is too long, so that the air conditioning equipment is locked by using the locking warning information, and the air conditioning equipment is prevented from continuously operating under the condition of a fault, and therefore, the reliability of the operation of the air conditioning equipment is improved.

In one of the technical solutions, a value of the seventh duration may be set by a user.

In one of the technical solutions, the value of the seventh time period is 10 minutes.

According to a second aspect of the present invention, there is provided a control device for an air conditioning apparatus, the air conditioning apparatus including a pump and an electronic expansion valve connected in series to a refrigerant circuit, the control device comprising: the electronic expansion valve comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the current opening degree of the electronic expansion valve; the collecting unit is used for collecting an inlet pressure value and an outlet pressure value of the pump; a determination unit for determining a pressure difference between the inlet pressure value and the outlet pressure value; and the adjusting unit is used for adjusting the current opening according to the pressure difference value.

The technical scheme of this application provides a controlling means of air conditioning equipment, and the air conditioning equipment who uses this controlling means can be according to the noise that reduces air conditioning equipment operation in-process, simultaneously, has improved the stability of air conditioning equipment operation.

The technical scheme of the application is realized by the following principle.

In the above technical solution, the adjusting unit is specifically configured to obtain a pressure setting difference value and a fluctuation value; determining a first deviation value according to the pressure difference value, the pressure setting difference value and the fluctuation value; acquiring historical adjustment information and an adjustment period of the electronic expansion valve, wherein the historical adjustment information comprises a second deviation value and a third deviation value; determining an adjustment step length according to a proportional coefficient of the pressure difference value, an integral time constant of the pressure difference value, a differential time constant of the pressure difference value, a first deviation value, a second deviation value, a third deviation value and an adjustment period; and adjusting the current opening according to the adjustment step length.

In any of the above technical solutions, the adjusting unit is specifically configured to set a first sum of the difference and the fluctuation value based on the pressure difference being greater than the pressure, and the first deviation value is a difference between the pressure difference and the first sum; based on the pressure difference being less than a first difference between the pressure set difference and the fluctuation value, the first deviation value being a difference between the first difference and the pressure difference; the first deviation value is zero based on the pressure difference value being greater than or equal to the first difference value and less than or equal to the first sum value.

In any of the above technical solutions, the adjusting unit is specifically further configured to obtain an adjustment step threshold of the electronic expansion valve; and adjusting the current opening according to the adjustment step threshold on the basis that the adjustment step is not lower than the adjustment step threshold.

In any of the above technical solutions, the adjusting unit is specifically configured to adjust the current opening to a target opening, where the target opening is a sum of the current opening and an adjustment step.

In any of the above technical solutions, the obtaining unit is further configured to control the electronic expansion valve to operate for a first duration according to the maximum opening degree.

In any of the above technical solutions, the adjusting unit is specifically further configured to update the pressure difference value based on the second duration of continuous operation of the pump; and adjusting the adjustment period according to the updated pressure difference value.

In any of the above technical solutions, the adjusting unit is further configured to control the air conditioning equipment to stop for a fifth duration and output warning information based on that the duration that the pressure difference value is greater than the upper limit of the pressure difference value is greater than the third duration.

In any of the above technical solutions, the adjusting unit is further configured to control the air conditioning equipment to stop for a fifth duration and output warning information based on that the duration that the pressure difference value is smaller than the pressure difference value lower limit is longer than the fourth duration.

In any of the above technical solutions, the adjusting unit is further configured to output the locking warning information within a sixth duration based on the fact that the counted number of times of triggering the warning information is greater than the preset number of times.

In any of the above technical solutions, the adjusting unit is further configured to output the locking warning information based on that the accumulated time length of the output warning information is greater than a seventh time length.

According to a third aspect of the present invention, there is provided a control device for an air conditioning apparatus including a pump and an electronic expansion valve, the control device comprising: a memory storing a program or instructions, and a processor implementing the steps of the control method of the air conditioner as described in any one of the above when the processor executes the program or instructions.

According to a fourth aspect of the present invention, there is provided a readable storage medium on which a program or instructions are stored, the program or instructions, when executed by a processor, implementing the steps of the control method of an air conditioning apparatus as in any one of the above.

According to a fifth aspect of the present invention, there is provided an air conditioning apparatus comprising: a control device for any of the air conditioners described above; and/or a readable storage medium as described above.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a flowchart illustrating a control method of an air conditioning apparatus in an embodiment of the present invention;

FIG. 2 shows a schematic diagram of control based on a first pressure differential;

FIG. 3 shows a schematic diagram of control based on a second pressure differential value;

fig. 4 shows a schematic block diagram of a control device of an air conditioning apparatus in the embodiment of the present invention.

Detailed Description

So that the manner in which the above recited aspects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

Example one

As shown in fig. 1, according to an embodiment of the present invention, there is provided a control method of an air conditioning apparatus, wherein the air conditioning apparatus includes a pump and an electronic expansion valve, the control method including:

102, acquiring the current opening degree of the electronic expansion valve;

104, collecting an inlet pressure value and an outlet pressure value of the pump;

step 106, determining a pressure difference value between an inlet pressure value and an outlet pressure value;

and step 108, adjusting the current opening degree of the electronic expansion valve according to the pressure difference value.

The embodiment of the application provides a control scheme of air conditioning equipment, and by operating the control method, the noise in the operation process of the air conditioning equipment can be reduced, and meanwhile, the stability of the operation of the air conditioning equipment is improved.

Embodiments of the present application are realized by the following principles.

The embodiment of this application sets out from the source that appears the noise, promptly, does not operate at reliable operation scope based on the business turn over pressure differential of pump machine, and is adjustable through the aperture of injecing electronic expansion valve to when utilizing electronic expansion valve to adjust the pump machine operation, the pressure differential value of refrigerant import and export, so that with its control in reliable operation scope, thereby the production of noise when having restrained air conditioning equipment operation, simultaneously, guaranteed the stability of air conditioning equipment operation.

Specifically, in the embodiment of the application, the pressure sensors are respectively arranged at the inlet and the outlet of the pump, so that the pressure sensors are used to acquire the pressure of the refrigerant at the corresponding positions, after the inlet pressure value and the outlet pressure value of the pump are acquired, a difference value between the inlet pressure value and the outlet pressure value is calculated to serve as a pressure difference value, and the current opening degree of the electronic expansion valve is adjusted according to the pressure difference value, so that the adjusted inlet and outlet pressure difference of the pump is within a reliable operation range.

In the embodiment, the pressure difference between the inlet and the outlet of the pump is in a reliable operation range under the condition that the working condition of the air conditioning equipment is changed and the pipe diameter of the long connecting pipe is changed.

Example two

In one embodiment, adjusting the current opening degree of the electronic expansion valve according to the pressure difference value includes: acquiring a pressure setting difference value and a fluctuation value; determining a first deviation value according to the pressure difference value, the pressure setting difference value and the fluctuation value; acquiring historical adjustment information and an adjustment period of the electronic expansion valve, wherein the historical adjustment information comprises a second deviation value and a third deviation value; determining an adjustment step length according to a proportional coefficient of the pressure difference value, an integral time constant of the pressure difference value, a differential time constant of the pressure difference value, a first deviation value, a second deviation value, a third deviation value and an adjustment period; and adjusting the current opening according to the adjustment step length.

In this embodiment, it is defined how to adjust the current opening degree according to the pressure difference value, in the course of which an adjustment step size is determined according to the pressure difference value, so as to adjust the current opening degree according to the adjustment step size.

In one embodiment, the pressure setting difference may be set according to an equipment parameter of the air conditioning equipment, wherein the equipment parameter may be the length of the long connecting pipe.

In one embodiment, the pressure setting difference may be set according to a limit operating condition of the air conditioning equipment, wherein the limit operating condition may include a limit operating temperature, such as minus 40 degrees celsius.

In the above embodiment, the fluctuation value may be an amplitude of fluctuation of the pressure setting difference in an actual operation condition, and a value of the fluctuation value may be set according to an equipment parameter of the air conditioning equipment, where the equipment parameter may be a length of the long connecting pipe. And the air conditioner can also be set according to the limit operation condition of the air conditioner.

In the above embodiment, the combination of the pressure setting difference value and the fluctuation value may obtain a reliable operation range in which the pressure difference value between the inlet and the outlet of the pump is located during the operation of the air conditioning apparatus, specifically, the reliable operation range is [ the difference value between the pressure setting difference value and the fluctuation value, the sum value between the pressure setting difference value and the fluctuation value ].

In one embodiment, the adjustment period is a time interval between two times of adjusting the opening degree, in one embodiment, a value of the adjustment period is between 5 seconds and 300 seconds, and further, the value of the adjustment period includes an endpoint position, that is, the value of the adjustment period may be 5 seconds or 300 seconds.

In one embodiment, the adjustment period is selected by default to 10 seconds.

In one embodiment, the history adjustment information includes a deviation value corresponding to a pressure difference between an inlet and an outlet of the pump during the history adjustment process of the electronic expansion valve, and in the embodiment of the present application, the second deviation value and the third deviation value are respectively a deviation value determined according to the pressure difference between the inlet and the outlet, the pressure setting difference, and the fluctuation value when the opening degree of the electronic expansion valve is adjusted last time.

In the above-described embodiments, the proportionality coefficient of the pressure difference value is expressed in the present application as a proportionality coefficient, the integral time constant of the pressure difference value is expressed as an integral time constant, and the differential time constant of the pressure difference value is expressed as a differential time constant, which is a constant.

In one embodiment, the scale factor ranges from 0.1 to 10, and the specific value includes an endpoint value, for example, the scale factor is 0.1, or the scale factor is 10.

In one embodiment, the scaling factor is chosen to be 2.0 by default.

In one embodiment, the value of the integration time constant ranges from 1 to 999, and the specific value includes an endpoint value, such as the integration time constant is selected to be 1, or the integration time constant is selected to be 999.

In one embodiment, the integration time constant is chosen by default to 60 seconds.

In one embodiment, the value of the differential time constant ranges from 0 to 999, and the specific value includes an endpoint value, such as the differential time constant is selected to be 0, or the differential time constant is selected to be 999.

In any of the above embodiments, determining the adjustment step size based on the above parameters follows the following equation:

u(t)＝Ratio_eevscale×[e(t)-e(t-1)]+Ratio_eevscale×

(Time_eevmeasure/Time_eevintegral)×e(t)+Ratio_eevscale×

(Time_eevdifftial/Time_eevmeasure)×[e(t)-2e(t-1)+e(t-2)]。

EXAMPLE III

In one embodiment, determining the first deviation value based on the pressure difference value, the pressure setting difference value, and the fluctuation value includes: based on the pressure difference being greater than a first sum of the pressure set difference and the fluctuation value, the first deviation value being a difference between the pressure difference and the first sum; based on the pressure difference being less than a first difference between the pressure set difference and the fluctuation value, the first deviation value being a difference between the first difference and the pressure difference; the first deviation value is zero based on the pressure difference value being greater than or equal to the first difference value and less than or equal to the first sum value.

In this embodiment, a determination of the first deviation value is defined, in particular, as indicated above: e (t) represents the first deviation value corresponding to the time t, and the determination of the first deviation value e (t) follows the following scheme:

when P3(t) > P3set + P3 debizone, e (t) ═ P3(t) -P3set-P3 debizone;

when P3(t) < P3set-P3 debizone, e (t) ═ P3set-P3 debizone-P3 (t);

Example four

In one embodiment, the method further comprises the following steps: acquiring an adjustment step length threshold of the electronic expansion valve; and adjusting the current opening according to the adjustment step threshold on the basis that the adjustment step is not lower than the adjustment step threshold.

In this embodiment, in the process of adjusting the current opening according to the adjustment step length, the adjustment step length is compared with the adjustment step length threshold value so as to determine whether the adjustment step length is reasonable, and only under the condition that the adjustment step length belongs to the reasonable step length, the current opening is adjusted according to the adjustment step length.

In the above embodiment, when the adjustment step is greater than or equal to the adjustment step threshold, the current opening is adjusted by using the adjustment step threshold, and through the above limitation, it is avoided that the strong fluctuation of the air conditioning equipment occurs and the operation stability of the air conditioning equipment is affected due to the excessively large adjustment range of the single opening.

In one embodiment, the calculated adjustment step size may be a negative value, and therefore, when the adjustment step size is greater than or equal to the adjustment step size threshold, the current opening degree is adjusted by using the adjustment step size threshold, and when the absolute value of the adjustment step size is greater than or equal to the adjustment step size threshold, the current opening degree is adjusted by using the adjustment step size threshold, so as to ensure the stability of the air conditioning equipment and reduce the possibility of strong fluctuation of the air conditioning system.

In any of the above embodiments, the value of the adjustment step threshold is related to the opening degree of the electronic expansion valve, and specifically, the value of the adjustment step threshold follows the following scheme:

the value of the adjustment step length threshold is the smaller value of the default step number and a first step number, wherein the first step number is the product of a preset coefficient and the opening of the electronic expansion valve, and specifically, the value of the preset coefficient is 0.1.

In one embodiment, when it is considered that the adjustment step size is smaller than the adjustment step size threshold, the current opening degree is adjusted according to the adjustment step size.

In any of the embodiments described above, when the adjustment step size is greater than or equal to 0.5 step and less than the minimum adjustment step size, the current opening degree is adjusted according to the minimum adjustment step size.

In any of the above embodiments, the default value of the minimum adjustment step size is 1.

In any of the embodiments described above, when the adjustment step size is greater than or equal to 0 step and less than 0.5 step, the adjustment step size is selected to be 0, and the current step size is adjusted accordingly.

In the embodiment, the frequency of the electronic expansion valve is avoided through the limitation, and the service life of the electronic expansion valve is further prolonged.

In one embodiment, adjusting the current opening according to the adjustment step includes: and adjusting the current opening to be a target opening, wherein the target opening is the sum of the current opening and the adjustment step length.

In this embodiment, it is defined how to adjust the current opening according to the adjustment step size, and in this embodiment, the target opening, that is, the adjusted opening, is the sum of the current opening and the adjustment step size.

In one embodiment, before obtaining the current opening degree of the electronic expansion valve, the method further includes: and controlling the electronic expansion valve to operate for a first time period according to the maximum opening degree.

In the embodiment, the electronic expansion valve is limited to operate at the maximum opening degree and is maintained for the first time period, so that the air conditioning equipment can be sufficiently operated, and the condition that the electronic expansion valve is adjusted at the initial starting stage of the air conditioning equipment to cause abnormal operation of the air conditioning equipment is avoided.

In any of the above embodiments, the maximum opening degree may be understood as the maximum rated opening degree of the electronic expansion valve, for example, when the opening degree adjustment range of the electronic expansion valve is [0 step, 480 steps ], the maximum opening degree is 480 steps.

In one embodiment, the method further comprises the following steps: updating the pressure difference value based on the second duration of continuous operation of the pump; and adjusting the adjustment period according to the updated pressure difference value.

In the embodiment, the adjustment frequency of the electronic expansion valve is improved by changing the adjustment period, so that the adjustment speed of the electronic expansion valve is increased, the inlet and outlet pressure difference value of the pump can be adjusted to a reliable operation interval at the highest speed, the abnormal time of the air conditioning equipment is reduced, and the reliability of the air conditioning equipment is improved.

In the above embodiment, the value of the second duration is greater than or equal to the adjustment period.

In one embodiment, the second period of time is 3 minutes.

In one embodiment, the adjustment period is decreased when the updated pressure difference is greater than the first pressure difference, or the updated pressure difference is less than the second pressure difference.

For example, as shown in fig. 2, the first pressure difference may be 0.5MPa, or 0.54MPa, or 0.58MPa, and as the value of the first pressure difference increases, the adjustment range of the adjustment period increases.

For example, as shown in fig. 3, the second pressure difference may be 0.2MPa, or 0.16MPa, or 0.12MPa, and as the value of the second pressure difference decreases, the adjustment range of the adjustment period increases.

In one embodiment, the air conditioning equipment is controlled to stop under the condition that the inlet pressure value or the outlet pressure value is empty.

In one embodiment, the inlet or outlet pressure value being empty may be understood as no inlet or outlet pressure value being detected.

In one embodiment, after the stop instruction is received, the pump is controlled to stop, the electronic expansion valve is controlled to be closed when the stop time of the pump is longer than the default stop time, and meanwhile, the opening degree of the electronic expansion valve is increased by 40 steps on the basis of the step number when the electronic expansion valve is closed, so that the pump is ready for starting next time.

In one embodiment, the method further comprises the following steps: and controlling the air conditioning equipment to stop for a fifth time period based on the fact that the duration time of the pressure difference value larger than the upper limit of the pressure difference value is larger than the third time period, and outputting warning information.

In the embodiment, a detection scheme of high-voltage protection is provided, wherein the value of the upper limit of the pressure difference value can be set according to the actual use scene of the air conditioning equipment, and the air conditioning equipment is maintained in a timing manner by outputting the warning information, so that the probability of fault shutdown of the air conditioning equipment is reduced.

In one embodiment, the upper pressure difference limit is 0.6MPa by default.

In one embodiment, the value of the third duration is set according to a usage scenario of the air conditioning equipment, wherein the usage scenario may be outdoor, indoor, and the like.

In one embodiment, the third duration is selected by default to 30 seconds.

In one embodiment, the fifth time period may be selected at will and is not limited herein.

In one embodiment, the manner of expression of the warning message is not limited herein.

In one embodiment, the method further comprises the following steps: and controlling the air conditioning equipment to stop for a fifth time period based on the fact that the duration time of the pressure difference value smaller than the lower limit of the pressure difference value is longer than the fourth time period, and outputting warning information.

In the embodiment, a detection scheme of low-voltage protection is provided, wherein the value of the lower limit of the pressure difference value can be set according to the actual use scene of the air conditioning equipment, and the air conditioning equipment is maintained in a timing manner by outputting the warning information, so that the probability of the fault shutdown of the air conditioning equipment is reduced.

In one embodiment, the lower pressure difference limit is 0.1MPa by default.

In one embodiment, the value of the fourth duration is set according to a usage scenario of the air conditioning equipment, wherein the usage scenario may be outdoor, indoor, and the like.

In one embodiment, the fourth time is chosen by default to 30 seconds.

In one embodiment, the fifth time period is 3 minutes.

In one embodiment, the method further comprises the following steps: and within the sixth time length, outputting locking warning information based on the fact that the number of times of statistics of the triggering warning information is larger than the preset number of times.

In the embodiment, the locking warning information is output so as to lock the air conditioning equipment by using the locking warning information, so that the air conditioning equipment is prevented from continuously operating under the condition that a fault exists, and the reliability of the operation of the air conditioning equipment is improved.

In one embodiment, the value of the preset number of times may be set by a user.

In one embodiment, the default value of the preset number of times is 6 times.

In one embodiment, the value of the sixth duration may be set by a user.

In one embodiment, the sixth time period is 1 hour.

In one embodiment, the method further comprises the following steps: and outputting locking warning information based on the fact that the accumulated time length of the output warning information is longer than the seventh time length.

In the embodiment, the locking warning information is output when the time for outputting the warning information is too long, so that the air conditioning equipment is locked by using the locking warning information, the air conditioning equipment is prevented from continuously operating under the condition that a fault exists, and the reliability of the operation of the air conditioning equipment is improved.

In one embodiment, the value of the seventh duration may be set by a user.

In one embodiment, the seventh duration is 10 minutes.

EXAMPLE five

According to an embodiment of the present invention, as shown in fig. 4, the present invention provides a control device 400 for an air conditioning apparatus, the air conditioning apparatus includes a pump and an electronic expansion valve connected in series to a refrigerant circuit, the control device includes: an obtaining unit 402, configured to obtain a current opening degree of the electronic expansion valve; the acquisition unit 404 is used for acquiring an inlet pressure value and an outlet pressure value of the pump; a determining unit 406 for determining a pressure difference value of the inlet pressure value and the outlet pressure value; and an adjusting unit 408, configured to adjust the current opening degree according to the pressure difference.

The embodiment of the application provides a control device 400 of air conditioning equipment, and the air conditioning equipment using the control device can reduce noise in the operation process of the air conditioning equipment and improve the operation stability of the air conditioning equipment.

In the above embodiment, the adjusting unit 408 is specifically configured to obtain the pressure setting difference value and the fluctuation value; determining a first deviation value according to the pressure difference value, the pressure setting difference value and the fluctuation value; acquiring historical adjustment information and an adjustment period of the electronic expansion valve, wherein the historical adjustment information comprises a second deviation value and a third deviation value; determining an adjustment step length according to a proportional coefficient of the pressure difference value, an integral time constant of the pressure difference value, a differential time constant of the pressure difference value, a first deviation value, a second deviation value, a third deviation value and an adjustment period; and adjusting the current opening according to the adjustment step length.

In one embodiment, the adjustment period is selected by default to 10 seconds.

In one embodiment, the scaling factor is chosen to be 2.0 by default.

u(t)＝Ratio_eevscale×[e(t)-e(t-1)]+Ratio_eevscale×

(Time_eevmeasure/Time_eevintegral)×e(t)+Ratio_eevscale×

(Time_eevdifftial/Time_eevmeasure)×[e(t)-2e(t-1)+e(t-2)]。

In any of the above embodiments, the adjusting unit 408 is specifically configured to adjust the pressure setting difference value according to the pressure setting difference value and the fluctuation value; based on the pressure difference being less than a first difference between the pressure set difference and the fluctuation value, the first deviation value being a difference between the first difference and the pressure difference; the first deviation value is zero based on the pressure difference value being greater than or equal to the first difference value and less than or equal to the first sum value.

when P3(t) > P3set + P3 debizone, e (t) ═ P3(t) -P3set-P3 debizone;

when P3(t) < P3set-P3 debizone, e (t) ═ P3set-P3 debizone-P3 (t);

In any of the above embodiments, the adjusting unit 408 is specifically further configured to obtain an adjustment step threshold of the electronic expansion valve; and adjusting the current opening according to the adjustment step threshold on the basis that the adjustment step is not lower than the adjustment step threshold.

in one embodiment, the adjustment step threshold value is a smaller value of the default step number and a first step number, where the first step number is a product of a preset coefficient and an opening degree of the electronic expansion valve, and specifically, the value of the preset coefficient is 0.1.

In any of the above embodiments, the adjusting unit 408 is specifically configured to adjust the current opening degree to a target opening degree, where the target opening degree is a sum of the current opening degree and the adjustment step.

In any of the above embodiments, the obtaining unit 402 is further configured to control the electronic expansion valve to operate according to the maximum opening degree for a first time period.

In any of the above embodiments, the adjusting unit 408 is specifically further configured to update the pressure difference value based on the continuous operation of the pump for the second duration; and adjusting the adjustment period according to the updated pressure difference value.

In one embodiment, the second period of time is 3 minutes.

In any of the above embodiments, the adjusting unit 408 is further configured to control the air conditioning equipment to stop for a fifth time period and output warning information based on that the duration time that the pressure difference value is greater than the upper limit of the pressure difference value is greater than the third time period.

In one embodiment, the upper pressure difference limit is 0.6MPa by default.

In one embodiment, the third duration is selected by default to 30 seconds.

In any of the above embodiments, the adjusting unit 408 is further configured to control the air conditioning equipment to stop for a fifth time period and output warning information based on that the duration time that the pressure difference value is smaller than the lower limit of the pressure difference value is longer than the fourth time period.

In one embodiment, the lower pressure difference limit is 0.1MPa by default.

In one embodiment, the fourth time is chosen by default to 30 seconds.

In one embodiment, the fifth time period is 3 minutes.

In any of the above embodiments, the adjusting unit 408 is further configured to output the locking warning information based on the counted number of times of triggering the warning information being greater than the preset number of times within the sixth time period.

In one embodiment, the default value of the preset number of times is 6 times.

In one embodiment, the value of the sixth duration may be set by a user.

In one embodiment, the sixth time period is 1 hour.

In any of the above embodiments, the adjusting unit 408 is further configured to output the locking warning information based on that the accumulated time period for outputting the warning information is longer than the seventh time period.

In one embodiment, the value of the seventh duration may be set by a user.

In one embodiment, the seventh duration is 10 minutes.

EXAMPLE six

According to an embodiment of the present invention, there is provided a control device of an air conditioning apparatus including a pump and an electronic expansion valve, the control device including: a memory storing a program or instructions, and a processor implementing the steps of the control method of the air conditioner as described in any one of the above when the processor executes the program or instructions.

EXAMPLE seven

According to an embodiment of the present invention, there is provided a readable storage medium on which a program or instructions are stored, the program or instructions, when executed by a processor, implementing the steps of the control method of the air conditioning apparatus as in any one of the above.

Example eight

According to an embodiment of the present invention, there is provided an air conditioning apparatus including: a control device for any of the air conditioners described above; and/or a readable storage medium as described above.

In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically limited, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A control method of an air conditioning apparatus, characterized in that the air conditioning apparatus includes a pump and an electronic expansion valve, the control method comprising:

acquiring the current opening degree of the electronic expansion valve;

collecting an inlet pressure value and an outlet pressure value of the pump;

determining a pressure difference between the inlet pressure value and the outlet pressure value;

and adjusting the current opening degree of the electronic expansion valve according to the pressure difference value.

2. The method of claim 1, wherein the adjusting the current opening degree of the electronic expansion valve according to the pressure difference value comprises:

acquiring a pressure setting difference value and a fluctuation value;

determining a first deviation value according to the pressure difference value, the pressure setting difference value and the fluctuation value;

acquiring historical adjustment information and an adjustment period of the electronic expansion valve, wherein the historical adjustment information comprises a second deviation value and a third deviation value;

determining an adjustment step length according to the proportional coefficient of the pressure difference value, the integral time constant of the pressure difference value, the differential time constant of the pressure difference value, the first deviation value, the second deviation value, the third deviation value and the adjustment period;

and adjusting the current opening according to the adjustment step length.

3. The control method of an air conditioning apparatus according to claim 2, wherein determining a first deviation value based on the pressure difference value, the pressure setting difference value, and the fluctuation value includes:

based on the pressure difference value being greater than a first sum of the pressure setting difference value and the fluctuation value, the first deviation value being a difference of the pressure difference value and the first sum;

based on the pressure difference value being less than a first difference value of the pressure setting difference value and the fluctuation value, the first deviation value being a difference of the first difference value and the pressure difference value;

the first deviation value is zero based on the pressure difference value being greater than or equal to a first difference value and less than or equal to the first sum value.

4. The control method of an air conditioning apparatus according to claim 2,

acquiring an adjustment step length threshold value of the electronic expansion valve;

and adjusting the current opening according to the adjustment step threshold on the basis that the adjustment step is not lower than the adjustment step threshold.

5. The control method of an air conditioning apparatus according to claim 2, wherein adjusting the current opening degree according to the adjustment step size includes:

and adjusting the current opening to be a target opening, wherein the target opening is the sum of the current opening and the adjustment step length.

6. The control method of an air conditioning apparatus according to claim 2, wherein before acquiring the current opening degree of the electronic expansion valve, further comprising:

and controlling the electronic expansion valve to operate for a first time period according to the maximum opening degree.

7. The control method of an air conditioning apparatus according to claim 2, characterized by further comprising:

updating the pressure difference value based on the continuous operation of the pump for a second time period;

and adjusting the adjustment period according to the updated pressure difference value.

8. The control method of an air conditioning apparatus according to claim 2, characterized by further comprising:

and controlling the air conditioning equipment to stop for a fifth time period based on the fact that the duration time that the pressure difference value is greater than the upper limit of the pressure difference value is greater than the third time period, and outputting warning information.

9. The control method of an air conditioning apparatus according to claim 8, characterized by further comprising:

and controlling the air conditioning equipment to stop for a fifth time period based on the fact that the duration time of the pressure difference value smaller than the lower limit of the pressure difference value is longer than a fourth time period, and outputting warning information.

10. The control method of an air conditioning apparatus according to claim 8 or 9, characterized by further comprising:

and within the sixth time length, outputting locking warning information based on the fact that the number of times of statistics for triggering the warning information is larger than the preset number of times.

11. The control method of an air conditioning apparatus according to claim 8 or 9, characterized by further comprising:

and outputting locking warning information based on the fact that the accumulated time for outputting the warning information is longer than the seventh time.

12. A control device of air conditioning equipment is characterized in that the air conditioning equipment comprises a pump and an electronic expansion valve which are connected in series on a refrigerant loop, and the control device comprises:

the acquisition unit is used for acquiring the current opening degree of the electronic expansion valve;

the collecting unit is used for collecting an inlet pressure value and an outlet pressure value of the pump;

a determination unit for determining a pressure difference value of the inlet pressure value and the outlet pressure value;

and the adjusting unit is used for adjusting the current opening according to the pressure difference value.

13. A control device of an air conditioning apparatus, characterized in that the air conditioning apparatus includes a pump and an electronic expansion valve, the control device comprising:

a memory storing a program or instructions, and a processor implementing the steps of the control method of the air conditioning apparatus according to any one of claims 1 to 11 when executing the program or instructions.

14. A readable storage medium, characterized in that the readable storage medium stores thereon a program or instructions which, when executed by a processor, implement the steps of the control method of an air conditioning apparatus according to any one of claims 1 to 11.

15. An air conditioning apparatus, characterized by comprising:

the control device of an air conditioning apparatus according to claim 12 or 13; and/or

The readable storage medium of claim 14.