A compressor frequency control method, device, equipment and storage medium

Abstract

The application discloses a compressor frequency control method, device, equipment and storage medium. The method comprises the following steps: obtaining the exhaust temperature of the compressor in a preset time period, and then determining a temperature change index based on the exhaust temperature. The first frequency control strategy of the compressor and the corresponding first temperature upper limit value are obtained, and a temperature compensation value is determined based on the temperature change index and the first frequency control strategy, which is used to compensate the first temperature upper limit value of the first frequency control strategy. The compressor is controlled to change from the first frequency control strategy to the second frequency control strategy based on the compensated temperature upper limit value, so as to control the frequency of the compressor according to the second frequency control strategy. That is, the temperature compensation value is used to compensate the temperature upper limit value of the current frequency control strategy, the frequency control strategy of the next stage is allowed to participate in control in advance, the shutdown problem caused by the reaction lag of the exhaust temperature is avoided, and therefore the accuracy of the compressor frequency control based on the exhaust temperature is improved.

Description

Technical Field

[0001] This application relates to the field of control technology, and in particular to a method, apparatus, equipment and storage medium for controlling the frequency of a compressor. Background Technology

[0002] When an air conditioner is running in cooling mode, the compressor primarily functions to compress and drive the refrigerant. The entire refrigeration circuit can be divided into a condensation zone (high-pressure zone) and an evaporation zone (low-pressure zone). The compressor draws refrigerant from the low-pressure zone, compresses it, and sends it to the high-pressure zone for cooling and condensation, dissipating heat into the outdoor air as the refrigerant changes from a gaseous to a liquid state. Then, the liquid refrigerant is injected into the evaporator, causing a sudden pressure drop. The liquid refrigerant absorbs heat from the indoor air, changing from a liquid to a gaseous state, thus achieving cooling. The heat discharged by the compressor during the condensation of the refrigerant is called the exhaust temperature, which can be obtained by measuring the temperature of the gas discharged from the compressor's exhaust pipe using a temperature sensor.

[0003] Normally, the compressor control strategy, such as increasing or decreasing the frequency, can be determined based on the actual exhaust temperature to ensure the compressor is not overloaded or over-pressured, thus achieving the desired cooling effect. Increasing the compressor frequency will cause the exhaust temperature to rise. Currently, there is always a lag between compressor frequency adjustment and exhaust temperature changes. For example, if the compressor frequency increases rapidly while the exhaust temperature response is slow, when the frequency reaches a certain value, the actual temperature rise will still be lagging, and the exhaust temperature will continue to increase at the current frequency. When the exhaust temperature reaches the point where the frequency needs to be reduced, even if the compressor frequency is controlled to decrease at this point, the change in exhaust temperature is not timely enough, so the exhaust temperature will continue to rise, potentially reaching the overheating shutdown protection value and causing the compressor to shut down. Summary of the Invention

[0004] In view of this, embodiments of this application provide a method, apparatus, device, and storage medium for controlling compressor frequency, so as to improve the accuracy of compressor frequency control.

[0005] In a first aspect, embodiments of this application provide a method for controlling the frequency of a compressor, the method comprising:

[0006] Obtain the compressor's exhaust temperature within a preset time period;

[0007] The temperature change index is determined based on the exhaust temperature.

[0008] The first frequency control strategy of the compressor and the first temperature upper limit value corresponding to the first frequency control strategy are obtained. The first frequency control strategy is used to control the frequency of the compressor.

[0009] The temperature compensation value is determined based on the temperature change index and the first frequency control strategy.

[0010] Based on the first upper temperature limit and the temperature compensation value, the frequency control strategy for controlling the compressor is changed from the first frequency control strategy to the second frequency control strategy, so as to control the frequency of the compressor according to the second frequency control strategy.

[0011] In one possible implementation, obtaining the compressor's exhaust temperature over a preset time period includes:

[0012] The exhaust temperature of the compressor during a first preset time period and the exhaust temperature during a second preset time period are obtained;

[0013] The determination of temperature change indicators based on the exhaust temperature includes:

[0014] Based on the exhaust temperature of the compressor during the first preset time period, a first temperature change value is determined;

[0015] The second temperature change value is determined based on the exhaust temperature of the compressor during the second preset time period;

[0016] The target temperature change value is determined based on the first temperature change value and the second temperature change value.

[0017] In one possible implementation, obtaining the compressor's exhaust temperature over a preset time period includes:

[0018] The exhaust temperature of the compressor during a third preset time period and the exhaust temperature during a fourth preset time period are obtained;

[0019] The determination of temperature change indicators based on the exhaust temperature includes:

[0020] The first average temperature is determined based on the exhaust temperature of the compressor during the third preset time period;

[0021] The second average temperature is determined based on the exhaust temperature of the compressor during the fourth preset time period;

[0022] The rate of temperature change is determined based on the first average temperature and the second average temperature.

[0023] In one possible implementation, the step of changing the frequency control strategy of the compressor from the first frequency control strategy to the second frequency control strategy based on the first upper temperature limit and the temperature compensation value includes:

[0024] Based on the first upper temperature limit and the temperature compensation value, the target upper temperature limit is determined;

[0025] When the exhaust temperature of the compressor reaches the target temperature upper limit, the frequency control strategy for controlling the compressor changes from the first frequency control strategy to the second frequency control strategy.

[0026] In one possible implementation, determining the first temperature change value based on the compressor's exhaust temperature during the first preset time period includes:

[0027] The exhaust temperature of the compressor at the beginning of the first preset time period and at the end of the first preset time period are obtained.

[0028] The first temperature change value is determined based on the exhaust temperature at the end time and the exhaust temperature at the beginning time.

[0029] In one possible implementation, when the temperature change index is less than a preset index, and,

[0030] When the first frequency control strategy is rapid frequency increase, the second frequency control strategy is slow frequency increase;

[0031] When the first frequency control strategy is slow frequency ramping, the second frequency control strategy is frequency maintenance;

[0032] When the first frequency control strategy is frequency hold, the second frequency control strategy is slow frequency reduction;

[0033] When the first frequency control strategy is slow frequency reduction, the second frequency control strategy is fast frequency reduction;

[0034] When the first frequency control strategy is rapid frequency reduction, the second frequency control strategy is shutdown protection.

[0035] In one possible implementation, when the temperature change index is greater than or equal to the preset index, the second frequency control strategy is to keep the current frequency unchanged.

[0036] Secondly, embodiments of this application provide a compressor frequency control device, the device comprising:

[0037] The first acquisition module is used to acquire the exhaust temperature of the compressor within a preset time period;

[0038] The first determining module is used to determine a temperature change index based on the exhaust temperature;

[0039] The second acquisition module is used to acquire the current first frequency control strategy of the compressor and the first temperature upper limit value corresponding to the first frequency control strategy, wherein the first frequency control strategy is used to control the frequency of the compressor.

[0040] The second determining module is used to determine the temperature compensation value based on the temperature change index and the first frequency control strategy.

[0041] The control module is configured to control the compressor's frequency control strategy to change from the first frequency control strategy to a second frequency control strategy based on the first upper temperature limit and the temperature compensation value, so as to control the compressor's frequency according to the second frequency control strategy.

[0042] Thirdly, embodiments of this application provide a compressor frequency control device, the device comprising: a memory and a processor;

[0043] The memory is used to store the relevant program code;

[0044] The processor is used to call the program code to execute the compressor frequency control method described in any of the implementations of the first aspect above.

[0045] Fourthly, embodiments of this application provide a computer-readable storage medium for storing a computer program for executing the compressor frequency control method described in any of the implementations of the first aspect.

[0046] Therefore, the embodiments of this application have the following beneficial effects:

[0047] In the above implementation of this application, to improve the accuracy of compressor frequency control based on exhaust temperature, the exhaust temperature of the compressor within a preset time period is first obtained, and then a temperature change index is determined based on the exhaust temperature. The current first frequency control strategy of the compressor and the corresponding first temperature upper limit value are obtained. A temperature compensation value can be determined based on the temperature change index and the first frequency control strategy to compensate for the first temperature upper limit value of the first frequency control strategy. Based on the compensated temperature upper limit value, the compressor's frequency control strategy is changed from the first frequency control strategy to a second frequency control strategy, so that the compressor frequency can be controlled according to the second frequency control strategy. That is, the temperature compensation value can be used to compensate for the temperature upper limit value of the current frequency control strategy, allowing the frequency control strategy of the next stage to participate in control earlier, avoiding shutdown problems caused by exhaust temperature lag, thereby improving the accuracy of compressor frequency control based on exhaust temperature. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments provided in this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0049] Figure 1 A flowchart illustrating a compressor frequency control method provided in this application embodiment;

[0050] Figure 2 A schematic diagram of a compressor frequency control device provided in an embodiment of this application;

[0051] Figure 3 This is a schematic diagram of a compressor frequency control device provided in an embodiment of this application. Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are merely exemplary implementations of this application and not all implementation methods. Those skilled in the art can obtain other embodiments in conjunction with the embodiments of this application without creative effort, and these embodiments are also within the protection scope of this application.

[0053] By changing the compressor frequency, the efficiency of the compressor in compressing and driving the refrigerant can be altered, thereby achieving different cooling effects. Typically, the compressor control strategy, such as increasing or decreasing the frequency, can be determined based on the actual discharge temperature to ensure the compressor does not overload or overpressure. Increasing the compressor frequency causes the discharge temperature to rise. Currently, there is always a lag between compressor frequency adjustment and changes in discharge temperature. For example, if the compressor frequency increases rapidly while the discharge temperature response is slow, when the frequency reaches a certain value, the actual temperature rise in discharge will still be lagging, and the discharge temperature will continue to rise at the current frequency. When the discharge temperature reaches the point where the frequency needs to be reduced, even if the compressor frequency is controlled to decrease at this point, the change in discharge temperature is not timely enough, so the discharge temperature will continue to rise, potentially reaching the overheating shutdown protection value and causing the compressor to shut down.

[0054] Based on this, this application provides a compressor frequency control method to improve the accuracy of compressor frequency control. Specifically, the method first acquires the compressor's exhaust temperature within a preset time period, and then determines a temperature change index based on the exhaust temperature. The method acquires the compressor's current first frequency control strategy and the corresponding first temperature upper limit value. A temperature compensation value is determined based on the temperature change index and the first frequency control strategy to compensate for the first temperature upper limit value of the first frequency control strategy. Based on the compensated temperature upper limit value, the compressor's frequency control strategy is changed from the first frequency control strategy to a second frequency control strategy, so that the compressor frequency can be controlled according to the second frequency control strategy. In other words, the temperature compensation value can be used to compensate for the current frequency control strategy's temperature upper limit value, allowing the next stage of frequency control strategy to participate in control earlier, avoiding shutdown problems caused by lag in exhaust temperature response, thereby improving the accuracy of compressor frequency control based on exhaust temperature.

[0055] The methods provided in the embodiments of this application will now be described in conjunction with the accompanying drawings.

[0056] See Figure 1 , Figure 1 A flowchart illustrating a compressor frequency control method provided in this application embodiment.

[0057] This method can be executed by the air conditioner's controller. The controller can acquire the compressor's exhaust temperature and determine a suitable frequency control strategy based on the exhaust temperature to control the compressor to operate at the frequency specified in the above frequency control strategy. The method may include the following steps:

[0058] S101: Obtain the exhaust temperature of the compressor within a preset time period.

[0059] The compressor's exhaust temperature can be obtained by a temperature sensor installed in the exhaust pipe, and the obtained exhaust temperature can be sent to the controller so that the controller can process the exhaust temperature data.

[0060] S102: Determine temperature change indicators based on exhaust temperature.

[0061] Specifically, the controller can obtain the compressor's exhaust temperature over a preset time period and determine the temperature change index in the following manner: First, the controller obtains the compressor's exhaust temperature during a first preset time period and the exhaust temperature during a second preset time period. Then, based on the compressor's exhaust temperature during the first preset time period, it determines a first temperature change value; based on the compressor's exhaust temperature during the second preset time period, it determines a second temperature change value; and based on the first and second temperature change values, it determines a target temperature change value. For example, the target temperature change value can be determined based on the difference between the second and first temperature change values. The first temperature change value can be determined by obtaining the compressor's exhaust temperature at the beginning and end of the first preset time period, and determining the first temperature change value based on the temperature difference between the exhaust temperature at the end and the initial exhaust temperature. The first temperature change value can be positive or negative. A positive first temperature change value indicates an increase in exhaust temperature during the first preset time period; a negative first temperature change value indicates a decrease in exhaust temperature during the first preset time period. Similarly, the second temperature change value can be determined based on the temperature difference between the exhaust temperature at the beginning and the end of the second preset time period.

[0062] Optionally, this application also provides a method for determining a temperature change index. The controller acquires the exhaust temperature of the compressor during a third preset time period and the exhaust temperature during a fourth preset time period. Then, it determines a first average temperature based on the exhaust temperature of the compressor during the third preset time period, and a second average temperature based on the exhaust temperature of the compressor during the fourth preset time period. Based on the first and second average temperatures, it determines the rate of temperature change. For example, it determines the temperature change difference based on the second and first average temperatures, determines the time difference based on the initial time of the fourth preset time period and the initial time of the third preset time period, and then determines the rate of temperature change based on the ratio of the temperature change difference to the time difference. It should be noted that in this embodiment, the rate of temperature change can be positive or negative. When the rate of temperature change is positive, it indicates that the exhaust temperature during the fourth preset time period is higher than that during the third preset time period, and the exhaust temperature is rising; when the rate of temperature change is negative, it indicates that the exhaust temperature during the fourth preset time period is lower than that during the third preset time period, and the exhaust temperature is falling.

[0063] It should be noted that the methods for determining temperature change indicators in the above embodiments are merely illustrative examples and are not limited to the above implementation methods. Other feasible solutions are also within the scope of protection of this application.

[0064] S103: Obtain the current first frequency control strategy of the compressor and the first temperature upper limit value corresponding to the first frequency control strategy; wherein, the first frequency control strategy is used to control the frequency of the compressor.

[0065] In practical applications, several different frequency control strategies can be used to control the compressor's operation, such as rapid frequency increase, slow frequency increase, and rapid frequency decrease. Different frequency control strategies correspond to different upper limits for exhaust temperature. That is, when controlling the compressor under the current frequency control strategy, if the exhaust temperature is lower than the upper limit corresponding to the current strategy, the compressor frequency can be controlled according to the current strategy. If the compressor's exhaust temperature reaches the upper limit, the frequency control strategy needs to be switched to keep both the compressor frequency and exhaust temperature within a reasonable range. Therefore, to more accurately control the compressor frequency based on exhaust temperature, it is first necessary to obtain the compressor's current operating frequency control strategy and the corresponding upper limit temperature value. This allows for timely adjustment of the appropriate frequency control strategy based on current temperature changes.

[0066] It should be noted that this embodiment does not limit the order of steps S102 and S103. Step S102 can be executed first and then step S103, or step S103 can be executed first and then step S102, or steps S102 and S103 can be executed simultaneously. However, it is necessary to ensure that step S101 is executed before step S102.

[0067] S104: Determine the temperature compensation value based on the temperature change index and the first frequency control strategy.

[0068] To address the issue of delayed exhaust temperature response when adjusting compressor frequency, temperature compensation can be applied to the first temperature upper limit of the first frequency control strategy based on temperature change indicators. This means that before the first temperature upper limit of the first frequency control strategy is reached, the next frequency control strategy engages in control earlier, preventing problems caused by the delayed exhaust temperature response. Since different temperature change indicators indicate different temperature changes, and different frequency control strategies correspond to different temperature upper limits, the temperature compensation values ​​for different frequency control strategies also differ to avoid shutdown due to excessively high exhaust temperatures. Therefore, after determining the first frequency control strategy and temperature change indicators for the current compressor operation, the temperature compensation value can be determined based on these indicators. The correspondence between the frequency control strategy, temperature change indicators, and temperature compensation value can be pre-determined experimentally or stored in a table or database. When determining the temperature compensation value based on the frequency control strategy and temperature change indicators, it can be determined according to the pre-stored correspondence.

[0069] S105: Based on the first upper temperature limit and the temperature compensation value, the frequency control strategy of the compressor is changed from the first frequency control strategy to the second frequency control strategy.

[0070] Once the temperature compensation value is determined, the compressor's frequency control strategy can be changed from the first frequency control strategy to the second frequency control strategy based on the first upper temperature limit and the temperature compensation value. Specifically, a target upper temperature limit can be determined based on the first upper temperature limit and the temperature compensation value. When the compressor is running at its frequency according to the first frequency control strategy, if the compressor's exhaust temperature is detected to reach the target upper temperature limit, the compressor's frequency control strategy is changed from the first frequency control strategy to the second frequency control strategy, so that the controller can control the compressor's frequency according to the second frequency control strategy. Similarly, when controlling the compressor's frequency based on the second frequency control strategy, a second upper temperature limit corresponding to the second frequency control strategy can be determined according to the above embodiment, and temperature compensation can be applied to the second upper temperature limit to address the problem of lag in exhaust temperature response.

[0071] Optionally, compressor control can typically be divided into six frequency control strategies: rapid frequency increase, rapid frequency decrease, frequency hold, slow frequency decrease, rapid frequency decrease, and shutdown protection. The upper temperature limits corresponding to these six frequency control strategies increase sequentially. For example, the upper temperature limit for the rapid frequency increase control strategy can be set to 80℃, the upper temperature limit for the slow frequency increase control strategy to 85℃, the upper temperature limit for the frequency hold control strategy to 90℃, the upper temperature limit for the slow frequency decrease control strategy to 95℃, and the upper temperature limit for the rapid frequency decrease control strategy to 100℃. When the upper temperature limit of the rapid frequency decrease control strategy is exceeded, the next frequency control strategy is executed, namely shutdown protection, which stops the compressor from running to prevent damage to the compressor due to excessively high exhaust temperature. It should be noted that when the first frequency control strategy is rapid frequency decrease and the second frequency control strategy is shutdown protection, the second frequency control strategy does not have an upper temperature limit; that is, when the exhaust temperature exceeds the upper temperature limit corresponding to rapid frequency decrease, shutdown protection is executed.

[0072] Normally, when switching from the current frequency control strategy to the next frequency control strategy, it is called switching to an adjacent frequency control strategy. In this embodiment, if the obtained temperature change index is less than the preset index, that is, the temperature change index is within a reasonable range, when the first frequency control strategy is rapid frequency increase, the second frequency control strategy is slow frequency increase; when the first frequency control strategy is slow frequency increase, the second frequency control strategy is frequency maintenance; when the first frequency control strategy is frequency maintenance, the second frequency control strategy is slow frequency decrease; when the first frequency control strategy is slow frequency decrease, the second frequency control strategy is rapid frequency decrease; when the first frequency control strategy is rapid frequency decrease, the second frequency control strategy is shutdown protection. If the obtained temperature change index is greater than or equal to the preset index, it indicates that the temperature change is too large. At this time, the current frequency of the compressor can be kept unchanged, that is, the compressor frequency is not adjusted temporarily. The appropriate frequency control strategy can be determined by combining the actual value of the exhaust temperature when the change of the exhaust temperature is within a reasonable range, in order to prevent the exhaust temperature from being too high and causing a shutdown. In this embodiment, when the temperature change index represents the target temperature change value, the preset index can be set as a temperature change threshold. That is, when the target temperature change value is less than the temperature change threshold, it indicates that the temperature change is within a reasonable range. When the temperature change index represents the rate of temperature change, the preset index can be set as a temperature change rate threshold. That is, when the rate of temperature change is less than the temperature change rate threshold, it indicates that the temperature change is within a reasonable range. The specific value of the preset index can be set according to the actual application scenario, and this embodiment does not limit it in this way.

[0073] Based on the above method embodiments, the principle of compressor frequency control will be introduced below in conjunction with a specific application scenario.

[0074] In this application scenario, a detection cycle is defined as 3 seconds, meaning both the first and second preset time periods are 3 seconds each. The first preset time period comprises the first 3 seconds, and the second preset time period comprises the last 3 seconds. Based on the exhaust temperatures at the initial and final moments within the first preset time period, a first temperature change value A1 is determined. Based on the exhaust temperatures at the initial and final moments within the second preset time period, a second temperature change value A2 is determined. Based on the first temperature change value A1 and the second temperature change value A2, a target temperature change value B is determined. The correspondence between the compressor's frequency control strategy, the target temperature change value B, and the temperature compensation value is shown in Table 1.

[0075] The first column of Table 1 shows six different frequency control strategies, and the first row shows the corresponding temperature compensation values ​​when the target temperature change falls within different ranges. The shutdown protection control strategy does not have a temperature compensation value. When the target temperature change is greater than or equal to 5°C, it indicates that the temperature change exceeds the reasonable range, so the compressor frequency is temporarily not adjusted, and the current frequency remains unchanged.

[0076] Taking the cell in the second row and seventh column as an example, the corresponding temperature compensation value is -5℃. This indicates that when the first frequency control strategy is rapid frequency increase, if the target temperature change value is within the range of [3,5), the upper limit of the temperature corresponding to rapid frequency increase will be reduced by 5℃. Taking the upper limit of the temperature corresponding to rapid frequency increase as 80℃ as an example, after temperature compensation for the rapid frequency increase control strategy, the corresponding upper limit of the temperature is 75℃. That is, when the exhaust temperature reaches 75℃, the compressor is controlled to switch from the rapid frequency increase control strategy to the slow frequency increase control strategy.

[0077] Table 1 Correspondence Table

[0078]

[0079] The compressor frequency control method provided in this application can use temperature compensation value to compensate for the upper temperature limit of the current frequency control strategy, so that the frequency control strategy of the next stage can participate in the control in advance, avoid the shutdown problem caused by the lag in the response of exhaust temperature, and thus improve the accuracy of compressor frequency control based on exhaust temperature.

[0080] Based on the above method embodiments, this application also provides a compressor frequency control device. See also Figure 2 , Figure 2 This is a schematic diagram of a compressor frequency control device provided in an embodiment of this application.

[0081] The device 200 includes: a first acquisition module 201, a first determination module 202, a second acquisition module 203, a second determination module 204, and a control module 205;

[0082] The first acquisition module 201 is used to acquire the exhaust temperature of the compressor within a preset time period;

[0083] The first determining module 202 is used to determine a temperature change index based on the exhaust temperature;

[0084] The second acquisition module 203 is used to acquire the current first frequency control strategy of the compressor and the first temperature upper limit value corresponding to the first frequency control strategy, wherein the first frequency control strategy is used to control the frequency of the compressor.

[0085] The second determining module 204 is used to determine the temperature compensation value based on the temperature change index and the first frequency control strategy.

[0086] The control module 205 is used to control the frequency control strategy of the compressor to change from the first frequency control strategy to the second frequency control strategy based on the first upper temperature limit value and the temperature compensation value, so as to control the frequency of the compressor according to the second frequency control strategy.

[0087] In one possible implementation, the first acquisition module 201 is specifically used to acquire the exhaust temperature of the compressor during a first preset time period and the exhaust temperature during a second preset time period.

[0088] The first determining module 202 is specifically used to determine a first temperature change value based on the exhaust temperature of the compressor during the first preset time period; determine a second temperature change value based on the exhaust temperature of the compressor during the second preset time period; and determine a target temperature change value based on the first temperature change value and the second temperature change value.

[0089] In one possible implementation, the first acquisition module 201 is specifically used to acquire the exhaust temperature of the compressor in a third preset time period and the exhaust temperature in a fourth preset time period.

[0090] The first determining module 202 is specifically used to determine a first average temperature based on the exhaust temperature of the compressor during the third preset time period; determine a second average temperature based on the exhaust temperature of the compressor during the fourth preset time period; and determine the rate of temperature change based on the first average temperature and the second average temperature.

[0091] In one possible implementation, the control module 205 is specifically used to determine a target temperature upper limit based on the first temperature upper limit and the temperature compensation value; when the exhaust temperature of the compressor reaches the target temperature upper limit, the frequency control strategy of the compressor is changed from the first frequency control strategy to the second frequency control strategy.

[0092] In one possible implementation, the first determining module 202 is specifically used to obtain the exhaust temperature of the compressor at the beginning of the first preset time period and the exhaust temperature at the end of the first preset time period; and to determine the first temperature change value based on the exhaust temperature at the end of the time period and the exhaust temperature at the beginning of the time period.

[0093] In one possible implementation, when the temperature change index is less than a preset index, and,

[0094] When the first frequency control strategy is rapid frequency increase, the second frequency control strategy is slow frequency increase; when the first frequency control strategy is slow frequency increase, the second frequency control strategy is frequency hold; when the first frequency control strategy is frequency hold, the second frequency control strategy is slow frequency decrease; when the first frequency control strategy is slow frequency decrease, the second frequency control strategy is rapid frequency decrease; when the first frequency control strategy is rapid frequency decrease, the second frequency control strategy is shutdown protection.

[0095] In one possible implementation, when the temperature change index is greater than or equal to the preset index, the second frequency control strategy is to keep the current frequency unchanged.

[0096] The beneficial effects of the compressor frequency control device provided in this application embodiment can be found in the above method embodiment, and will not be repeated here.

[0097] Based on the above method and apparatus embodiments, this application also provides a compressor frequency control device. See also Figure 3 , Figure 3 This is a schematic diagram of a compressor frequency control device provided in an embodiment of this application.

[0098] The device 300 includes: a memory 301 and a processor 302;

[0099] The memory 301 is used to store relevant program code;

[0100] The processor 302 is used to call the program code to execute the compressor frequency control method described in the above method embodiment.

[0101] Furthermore, embodiments of this application also provide a computer-readable storage medium for storing a computer program for executing the compressor frequency control method described in the above method embodiments.

[0102] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. In particular, the device embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. The device embodiments described above are merely illustrative. Modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0103] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0104] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0105] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0106] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of controlling the frequency of a compressor, characterized by, The method includes: Obtain the compressor's exhaust temperature within a preset time period; The temperature change index is determined based on the exhaust temperature. The first frequency control strategy of the compressor and the first temperature upper limit value corresponding to the first frequency control strategy are obtained. The first frequency control strategy is used to control the frequency of the compressor. The temperature compensation value is determined based on the temperature change index and the first frequency control strategy. Based on the first upper temperature limit and the temperature compensation value, the target upper temperature limit is determined; When the exhaust temperature of the compressor reaches the target temperature upper limit, the frequency control strategy for controlling the compressor changes from the first frequency control strategy to the second frequency control strategy, so as to control the frequency of the compressor according to the second frequency control strategy.

2. The method of claim 1, wherein, The process of obtaining the compressor's exhaust temperature within a preset time period includes: The exhaust temperature of the compressor during a first preset time period and the exhaust temperature during a second preset time period are obtained; The determination of temperature change indicators based on the exhaust temperature includes: Based on the exhaust temperature of the compressor during the first preset time period, a first temperature change value is determined; The second temperature change value is determined based on the exhaust temperature of the compressor during the second preset time period; The target temperature change value is determined based on the first temperature change value and the second temperature change value.

3. The method of claim 1, wherein, The process of obtaining the compressor's exhaust temperature within a preset time period includes: The exhaust temperature of the compressor during a third preset time period and the exhaust temperature during a fourth preset time period are obtained; The determination of temperature change indicators based on the exhaust temperature includes: The first average temperature is determined based on the exhaust temperature of the compressor during the third preset time period; The second average temperature is determined based on the exhaust temperature of the compressor during the fourth preset time period; The rate of temperature change is determined based on the first average temperature and the second average temperature.

4. The method of claim 2, wherein, The step of determining the first temperature change value based on the exhaust temperature of the compressor within the first preset time period includes: The exhaust temperature of the compressor at the beginning of the first preset time period and at the end of the first preset time period are obtained. The first temperature change value is determined based on the exhaust temperature at the end time and the exhaust temperature at the beginning time.

5. The method according to any one of claims 1 to 4, characterized in that, When the temperature change index is less than the preset index, and, When the first frequency control strategy is rapid frequency increase, the second frequency control strategy is slow frequency increase; When the first frequency control strategy is slow frequency ramping, the second frequency control strategy is frequency maintenance; When the first frequency control strategy is frequency hold, the second frequency control strategy is slow frequency reduction; When the first frequency control strategy is slow frequency reduction, the second frequency control strategy is fast frequency reduction; When the first frequency control strategy is rapid frequency reduction, the second frequency control strategy is shutdown protection.

6. The method of claim 5, wherein, When the temperature change index is greater than or equal to the preset index, the second frequency control strategy is to keep the current frequency unchanged.

7. A control device for the frequency of a compressor, characterized in that The device includes: The first acquisition module is used to acquire the exhaust temperature of the compressor within a preset time period; The first determining module is used to determine a temperature change index based on the exhaust temperature; The second acquisition module is used to acquire the current first frequency control strategy of the compressor and the first temperature upper limit value corresponding to the first frequency control strategy, wherein the first frequency control strategy is used to control the frequency of the compressor. The second determining module is used to determine the temperature compensation value based on the temperature change index and the first frequency control strategy. The control module is used to determine a target upper temperature value based on the first upper temperature value and the temperature compensation value; when the exhaust temperature of the compressor reaches the target upper temperature value, the frequency control strategy of the compressor is changed from the first frequency control strategy to the second frequency control strategy, so as to control the frequency of the compressor according to the second frequency control strategy.

8. A control device for the frequency of a compressor, characterized in that The device includes: a memory and a processor; The memory is used to store the relevant program code; The processor is used to call the program code to execute the compressor frequency control method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store a computer program for executing the compressor frequency control method according to any one of claims 1 to 6.

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