Defrosting control method, air conditioning unit and computer readable storage medium

Abstract

The application discloses a defrosting control method, an air conditioning unit and a computer readable storage medium, and comprises the following steps: when the first temperature sensing bag and the second temperature sensing bag are both within T0±a, timing is started; when the first temperature sensing bag or both the first temperature sensing bag and the second temperature sensing bag deviate from the interval of T0±a, timing is stopped, and one of the first temperature sensing bag and the second temperature sensing bag is selected as a main temperature sensing bag according to a preset selection logic; the frost formation rate z is calculated by substituting the maintenance time length t into a preset frost formation rate calculation formula, the current preset defrosting interval is determined according to the frost formation rate and the current outdoor environment temperature parameter, and it is judged whether the defrosting mode is entered. The application detects the pipe temperature and the environment temperature through the double-pipe temperature sensing bag, calculates the frost formation rate through the maintenance time length, judges the current frost formation interval, carries out defrosting treatment according to different frost formation intervals, does not need to additionally increase a humidity detection device, is more accurate in judging the frost formation interval of the unit, and achieves precise defrosting.

Description

Technical Field

[0001] This invention relates to the field of air conditioning defrosting technology, and in particular to a defrosting control method, an air conditioning unit, and a computer-readable storage medium. Background Technology

[0002] Defrosting is a common function during air conditioner operation, especially in heating mode, where it accounts for a significant portion of energy consumption. However, the industry currently faces two prevalent problems:

[0003] First: the limitations of the temperature-time defrosting control method;

[0004] Defrosting determination typically employs a temperature-time defrosting control method. However, due to cost constraints or limitations in accuracy for some units, this method relies solely on frosting duration and pipe temperature, neglecting external environmental factors. This makes it difficult to perform defrosting at the optimal time, potentially leading to excessive frosting or complete absence of frosting, thus wasting energy and impacting air conditioning performance.

[0005] Second: The location of the temperature sensor causes inaccurate judgments;

[0006] Normally, air conditioning units place the temperature sensor for monitoring the defrost pipe temperature at the theoretical lowest position in the outdoor unit's circuit. However, due to differences in manufacturing processes and components, some units may have inaccurate judgments. Because the temperature sensor is not positioned accurately, the unit may have difficulty detecting frost formation in a timely and accurate manner, which could lead to delays or inaccurate execution of the defrosting operation.

[0007] Inaccurate judgment may lead to incomplete defrosting, leaving residual frost or ice, which in turn affects the performance and efficiency of the air conditioner. Summary of the Invention

[0008] In order to solve the technical problem of inaccurate defrosting determination of the outdoor unit of an air conditioner in the prior art, the present invention proposes a defrosting control method, an air conditioning unit, and a computer-readable storage medium.

[0009] The technical solution adopted in this invention is:

[0010] This invention proposes a defrosting control method, comprising the following steps:

[0011] Unit operation heating mode;

[0012] Acquire the first temperature parameter detected by the first temperature sensor located at the inlet of the outdoor heat exchanger; acquire the second temperature parameter detected by the second temperature sensor located at the outlet of the outdoor heat exchanger; and acquire the outdoor ambient temperature parameter T. 外 ;

[0013] When both the first temperature parameter detected by the first temperature sensor and the second temperature parameter detected by the second temperature sensor are within T0±a, timing begins and stops when both the first and second temperature parameters deviate from the range of T0±a, and the duration t is obtained; a is the preset deviation value.

[0014] The frost rate z is calculated by substituting the duration t into the preset frost rate calculation formula. The current preset defrosting interval is determined based on the frost rate z and the current outdoor ambient temperature parameter. Then, the control logic corresponding to the preset defrosting interval and the temperature parameter detected by the first or second temperature sensor as the main temperature sensor are used to determine whether to enter the defrosting mode.

[0015] Furthermore, the preset frosting rate calculation formula is: z = X / t + b, where X is the preset maximum frosting thickness and b is a preset coefficient.

[0016] Furthermore, the preset defrosting zones include: non-frosting zone, condensation zone, light frosting zone, normal frosting zone, and heavy frosting zone.

[0017] Furthermore, based on the frost rate z and the current outdoor ambient temperature parameter T... 外 Determining the current preset defrosting zone specifically includes:

[0018] When the frosting rate is less than or equal to the preset frosting rate, it is in the non-condensation zone;

[0019] When the frost rate is greater than the preset frost rate and the outdoor ambient temperature parameter is greater than or equal to the preset temperature, it is in the condensation zone.

[0020] When the frosting rate is greater than the preset frosting rate and less than or equal to the preset light frosting rate, and the outdoor ambient temperature parameter is less than the preset temperature, it is in the light frosting zone.

[0021] When the frosting rate is greater than the preset light frosting rate and less than or equal to the preset normal frosting rate, and the outdoor ambient temperature parameter is less than the preset temperature, it is in the normal frosting zone.

[0022] When the frosting rate is greater than the preset normal frosting rate and the outdoor ambient temperature parameter is less than the preset temperature, it is in the heavy frosting zone.

[0023] Furthermore, the control logic corresponding to the preset defrosting interval specifically includes:

[0024] The control logic for the light frost zone is as follows: when the temperature of the main temperature sensor is lower than the preset T light temperature, the unit enters the defrosting mode.

[0025] The control logic for the general frosting zone is as follows: when the temperature of the main temperature sensor is lower than the preset T, or when the unit is in the general frosting zone for more than the preset first time, the unit enters the defrosting mode.

[0026] The control logic for the heavy frost zone is as follows: when the temperature of the main temperature sensor is lower than the preset T degree, or when the unit is in the general frost zone for more than the preset second duration, the unit enters the defrosting mode.

[0027] And T 重度 >T 一般 >T 轻度 .

[0028] Furthermore, after obtaining the outdoor ambient temperature parameter T_out, the setting range of T0 is determined based on the preset ambient temperature range in which the outdoor ambient temperature parameter T_out is located and the outdoor ambient temperature parameter T_out, and the setting value of T0 is selected from the determined setting range of T0.

[0029] Furthermore, obtain the outdoor ambient temperature parameter T. 外 Then, based on the outdoor environmental parameter T 外 The preset ambient temperature range and outdoor environmental parameter T 外 Determine T respectively 重度 T 一般 T 轻度 The setting range, and from the determined T 重度 Select T in the setting range 重度 The setting value, from the determined T 一般 Select T in the setting range 一般 The setting value, from the determined T 轻度 Select the T setting value from the setting range.

[0030] Furthermore, the main temperature sensor is determined using the following steps: After the heating mode is turned on, the temperature sensor whose detected temperature parameter first drops to T0 among the first and second temperature sensors is selected as the main temperature sensor.

[0031] Furthermore, the control logic for the condensation zone and the non-frost zone is to prevent entering the defrosting mode.

[0032] The present invention also proposes an air conditioning unit that uses the above-mentioned defrosting control method to determine whether defrosting is required.

[0033] The present invention also proposes a computer-readable storage medium for storing a computer program, which executes the above-described defrosting control method when running.

[0034] Compared with the prior art, the present invention obtains the duration for which the temperature parameters detected by the first and second temperature sensors are maintained within T0±a. When the temperature of one of the first and second temperature sensors fluctuates due to system operation, it will not affect the acquisition of the maintenance time t, because the timing is considered to end only when both the first and second temperature sensors deviate from the temperature range. This can improve the accuracy of the recording.

[0035] Simultaneously, it can more accurately determine the frosting situation based on the temperature changes of the outdoor heat exchanger and perform defrosting operations accordingly to improve heating performance and energy efficiency. This method also effectively incorporates factors such as ambient humidity, overcoming the shortcomings of existing technologies in frosting control. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a flowchart from an embodiment of the present invention;

[0038] Figure 2 This is a frosting pattern in an embodiment of the present invention;

[0039] Figure 3 This is a flowchart of a specific embodiment of the present invention;

[0040] Figure 4 This is a piping structure diagram of the air conditioning unit in an embodiment of the present invention;

[0041] 1. Compressor;

[0042] 2. Four-way valve;

[0043] 3. Outdoor heat exchanger;

[0044] 31. First sensing bulb;

[0045] 32. Second temperature sensing bag;

[0046] 4. Electronic expansion valve;

[0047] 51. Large valve;

[0048] 52. Small valves;

[0049] 6. Outdoor unit. Detailed Implementation

[0050] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0051] The principles and structure of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0052] Defrosting is a common function in air conditioning operation and accounts for a significant proportion of heating energy consumption. Currently, the industry faces two common problems: First, defrosting determination often uses a temperature-time defrosting control method. However, due to unit cost or accuracy considerations, this method simply judges based on frost duration and pipe temperature without taking ambient humidity into account. This makes it difficult to determine the thickness of frost on the unit, easily leading to situations where heavy frost doesn't defrost or where defrosting occurs even when there is no frost. Second, while the ideal circuit for monitoring defrosting pipe temperature is often the lowest circuit in the outdoor unit's circuitry, in reality, due to differences in manufacturing processes or components, some units experience inaccurate detection, resulting in incomplete defrosting. To address this, this invention provides an improved defrosting control method. This method uses dual pipe temperature sensors to simultaneously monitor pipe temperature and ambient temperature, comparing the pipe temperature values ​​to accurately locate the primary and secondary pipe temperature sensors, thus avoiding situations where unit differences lead to the detection of non-lowest pipe temperatures. The system determines the frost zone based on the frost rate and takes corresponding defrosting measures for different frost zones without the need for additional humidity detection devices. This allows for a more accurate determination of the unit's frost status and enables precise defrosting operations.

[0053] like Figure 1 , 3 As shown, this invention proposes a defrosting control method, specifically applied to a heat pump air conditioner. The heat pump air conditioner includes an outdoor heat exchanger located outdoors. When the heat pump air conditioner is operating in heating mode, a first temperature sensor at the inlet of the outdoor heat exchanger detects a first temperature parameter, and a second temperature parameter is detected at the outlet of the outdoor heat exchanger. The defrosting control method of the heat pump air conditioner specifically includes the following steps:

[0054] Heating mode of heat pump air conditioning unit;

[0055] The system acquires the first temperature parameter detected by the first temperature sensor at the inlet of the outdoor heat exchanger in real time; and acquires the second temperature parameter detected by the second temperature sensor at the outlet of the outdoor heat exchanger.

[0056] When the first temperature parameter detected by the first temperature sensor and the second temperature parameter detected by the second temperature sensor are both within T0±a, where a is a preset deviation value, timing begins; when the temperature parameters detected by the first temperature sensor and the second temperature sensor (or only the first temperature sensor) both deviate from the range of T0±a, timing stops and the duration t (i.e., the duration of timing) is obtained, which is the duration for which the temperature parameters detected by the first temperature sensor and the second temperature sensor are maintained within T0±a, and a primary temperature sensor is selected from the first temperature sensor and the second temperature sensor according to the preset selection logic.

[0057] Substitute the duration t into the preset frost rate calculation formula to calculate the frost rate z, and then calculate the frost rate z based on the current outdoor ambient temperature parameter T. 外 Determine the current preset defrosting range, and then determine whether to enter defrosting mode based on the control logic corresponding to the preset defrosting range and the temperature parameters detected by the main temperature sensor.

[0058] This invention improves the accuracy of recording by simultaneously acquiring the duration for which the temperature parameters detected by the first and second temperature sensors are maintained within T0±a. When the temperature of one of the first and second temperature sensors fluctuates due to system operation, it will not affect the acquisition of the maintenance time t, because the timing is considered to end only when both the first and second temperature sensors deviate from the temperature range.

[0059] Through the above steps, the defrosting control method of the present invention can more accurately determine the frosting situation based on the temperature changes of the outdoor heat exchanger and perform defrosting operations according to the actual situation, thereby improving heating effect and energy utilization efficiency. This method also effectively incorporates factors such as ambient humidity, thus overcoming the shortcomings of existing technologies in frosting control.

[0060] Based on the study of unit frosting, the frosting process is divided into three stages: the start-up stage, the relatively stable cumulative frosting stage, and the frosting deterioration stage. The following provides a detailed explanation and examples of these three stages.

[0061] Start-up phase:

[0062] The start-up phase specifically refers to the initial heating phase, when the refrigerant in the cooling system circulates and establishes a pressure differential. This process is characterized by a rapid drop in the outdoor unit's pipe temperature, allowing the unit to reach the frosting conditions, typically within 3 to 10 minutes.

[0063] Accumulated frost stage:

[0064] When the first temperature parameter detected by the first temperature sensor is within the preset deviation value a within the temperature range T0±a, and the second temperature parameter detected by the second temperature sensor is also within the preset deviation value a within the temperature range T0±a, meaning the pipe temperature will also reach T0±a, the inlet and outlet temperatures of the outdoor heat exchanger enter a relatively stable frosting accumulation stage. This process is characterized by the frost on the outdoor unit condenser gradually thickening, but the pipe temperature slowly decreasing. This process is affected by outdoor humidity and differences in the unit itself, and generally accounts for a large part of the entire frosting cycle.

[0065] Frosting worsening stage:

[0066] As the frost thickens, the heat exchange of the outdoor condenser deteriorates, causing the outdoor unit's pipe temperature to drop rapidly. This is the deterioration phase. After running for a period of time, the pipe temperature drops rapidly, and the heating capacity is generally 50-60% of the initial stable phase. At this point, it is considered that the unit should enter the defrosting phase.

[0067] Specifically, the control logic corresponding to this invention is as follows:

[0068] When the air conditioner is turned on in heating mode, the unit starts up according to the normal heating operation logic. However, after the compressor starts, it begins to monitor the real-time pipe temperature of the first and second temperature sensors. After running for a period of time, the pipe temperature detected by the first temperature sensor will drop rapidly to T0. This is the heating start-up phase of the unit, and the entire system is not yet stable. The temperature detected by the second temperature sensor will lag behind the first temperature sensor in decreasing, and eventually the detected pipe temperature will also reach T0 (the actual temperature of the temperature sensors will fluctuate, but it is generally considered stable if the change is within 0.5 degrees, i.e., a = 0.5). At this time, the unit enters a relatively stable frosting accumulation phase.

[0069] The first and second temperature sensors will maintain the temperature at T0 for a period of time. After that, the tube temperature detected by the first temperature sensor will decrease (and the second temperature sensor will also decrease). The time during which the tube temperature detected by the first and second temperature sensors remains at T0 is recorded as t. The defrosting tube temperature is then corrected based on t. Generally, the shorter t is, the faster the frosting rate, and the higher the air humidity at this time.

[0070] In a specific embodiment, the preset frost rate calculation formula is: z = X / t + b, where X is the preset maximum frost thickness, b is a preset coefficient, and X is a maximum frost thickness X (mm) determined through experiments. This formula can be used to calculate an approximate frost rate, which can then be combined with the current outdoor ambient temperature T. 外 Determine the current defrosting interval.

[0071] like Figure 2 As shown, in a specific embodiment, the preset defrosting zones include: a non-frosting zone, a condensation zone, a light frosting zone, a normal frosting zone, and a heavy frosting zone.

[0072] When the heat pump air conditioning unit is operating in heating mode, the following procedure is used to determine the current preset defrosting interval based on the frosting rate z and the current outdoor ambient temperature parameter T:

[0073] When the frosting rate is less than or equal to the preset frosting rate, the system is in the non-frosting zone. This means that the current frosting rate is low and will not cause frosting, so no defrosting operation is required.

[0074] When the frosting rate exceeds the preset frosting rate and the outdoor ambient temperature is greater than or equal to the preset temperature, the system is in the condensation zone. At this time, the ambient temperature is high, and only condensation will occur, not frost. The preset temperature is 6 degrees Celsius.

[0075] When the frost rate is greater than the preset frost rate but less than or equal to the preset light frost rate, and the outdoor ambient temperature is lower than the preset temperature, the system is in the light frost zone. This indicates that the frost rate is low, but the outdoor temperature is not suitable for frost formation, so a light defrosting control strategy is adopted.

[0076] When the frosting rate is greater than the preset light frosting rate but less than or equal to the preset normal frosting rate, and the outdoor ambient temperature is lower than the preset temperature, the system is in the normal frosting zone. This indicates that the frosting rate is high and the outdoor temperature is suitable for frosting, therefore normal defrosting control is required.

[0077] When the frosting rate exceeds the preset normal frosting rate and the outdoor ambient temperature is lower than the preset temperature, the system is in the heavy frosting zone. This indicates that the frosting rate is very high and the outdoor temperature is suitable for frosting, therefore a more stringent defrosting control strategy is required to avoid severe frosting.

[0078] The preset settlement rate can be set to 0, the preset light frosting rate can be set to 0.5 as shown in the figure, and the preset normal frosting rate can be set to 1.3 as shown in the figure.

[0079] This zoning and corresponding control strategy helps ensure that the heat pump air conditioning system can take appropriate measures under different frosting conditions to maintain performance and energy efficiency. This intelligent control method can be adjusted according to the specific system and application scenario to ensure optimal performance and energy efficiency.

[0080] According to the preset selection logic, one of the first and second temperature sensors is selected as the primary temperature sensor. Specifically, after the heating mode is turned on, the temperature sensor whose detected temperature parameter drops to T0 first is selected as the primary temperature sensor. This is because the temperature sensor whose temperature parameter drops to T0 first can more accurately determine the defrosting timing and maintain heating performance; generally, the temperature parameter detected by the first temperature sensor drops to T0 first.

[0081] The control logic corresponding to the preset defrosting interval specifically includes:

[0082] The control logic for the condensation zone and the non-frost zone is: do not enter defrosting mode.

[0083] The control logic for the light frosting zone is as follows: when the temperature of the main sensing bulb is lower than the preset T... 轻度 At that time, the unit directly enters defrosting mode;

[0084] The control logic for the general frosting zone is as follows: when the temperature of the main sensing bulb is lower than the preset T... 一般 When the unit is in a normal frosting zone for more than a preset first time, the unit enters defrosting mode;

[0085] The control logic for the re-frost zone is as follows: when the temperature of the main sensing bulb is lower than the preset T... 重度 When the unit is in a normal frosting zone for more than a preset second time, the unit enters defrosting mode;

[0086] And T 重度 >T 一般 >T 轻度 .

[0087] In a specific embodiment, the preset second duration is less than the preset first duration. Specifically, the preset first duration can be set to 2 hours, and the preset second duration can be set to 1 hour.

[0088] In a specific embodiment, the outdoor ambient temperature parameter T is obtained. 外 After the steps, based on the outdoor environmental parameter T 外 The preset ambient temperature range and outdoor environmental parameter T 外 Determine the setting range of T0, and select the setting value of T0 from the determined setting range. Specifically, the middle value of the setting range can be used as the selected setting value.

[0089] Furthermore, obtain the outdoor ambient temperature parameter T. 外 Then, based on the outdoor environmental parameter T 外 The preset ambient temperature range and outdoor environmental parameter T 外 Determine T respectively 重度 T 一般 T 轻度 The setting range, and from the determined T 重度 Select T in the setting range 重度 The setting value, from the determined T 一般 Select T in the setting range 一般 The setting value, from the determined T 轻度 Select T in the setting range 轻度 The setting value. T 重度 T 一般 T 轻度 Specifically, the middle value of the set range can be used as the selected setting value.

[0090] And under normal circumstances T 外 >T0>T 重度 >T 一般 >T 轻度 .

[0091] The specific selections mentioned above are shown in the table below:

[0092]

[0093] That is, when T 外 The range is 6℃ > T 外 When the temperature is >-10℃, the range of values ​​for T0 is: T 外 -4≥T0≥T 外 -6,T 重度 The range of values ​​for T is: 外 -7≥T 重度 ≥T 外 -9,T 一般 The range of values ​​for T is: 外 -9b≥T 一般 ≥T 外 -11c,T 轻度 The range of values ​​for is T 外 -13≥T 轻度 ≥T 外 -15. T0, T 重度 T 一般 T 轻度 Specifically, the middle value of the set range can be used as the selected setting value.

[0094] When T 外 The range is in T 外 When the temperature is ≤-10℃, the range of values ​​for T0 is: T 外 -2≥T0≥T 外 -4,T 重度 The range of values ​​for T is: 外 -5≥T 重度 ≥T 外 -6,T 一般 The range of values ​​for T is: 外 -6≥T 一般 ≥T 外 -8,T 轻度 The range of values ​​for is T 外 -8≥T 轻度 ≥T 外 -10. T0, T 重度 T 一般 T 轻度 Specifically, the middle value of the set range can be used as the selected setting value.

[0095] The present invention also proposes an air conditioning unit that uses the above-mentioned defrosting control method to correct the conventional defrosting target temperature for defrosting the outdoor heat exchanger.

[0096] The air conditioning unit is specifically a heat pump air conditioning unit, which includes an indoor unit and an outdoor unit.

[0097] like Figure 4 As shown, the outdoor unit 6 specifically includes: a large valve 51, a small valve 52, a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an electronic expansion valve 4, and a fan corresponding to the outdoor heat exchanger 3. Specifically, the left pipe of the outdoor heat exchanger 3 is equipped with a first temperature sensing bulb 31, and the right pipe is equipped with a second temperature sensing bulb 32. When the air conditioning unit is running in heating mode, the refrigerant enters the outdoor heat exchanger from the left side and then flows from the right side of the outdoor heat exchanger. That is, the first temperature sensing bulb detects the inlet temperature of the outdoor heat exchanger in heating mode, and the second temperature sensing bulb detects the outlet temperature of the outdoor heat exchanger in heating mode.

[0098] In a specific embodiment, the second temperature sensor 32 is set at the last small bend of the circuit with the highest temperature among all the circuits during heating, or at the inlet of the outdoor heat exchanger, as a defrosting auxiliary temperature sensor.

[0099] The present invention also proposes a computer-readable storage medium for storing a computer program that executes the above-described defrosting control method when the computer program is run.

[0100] The method proposed in this invention divides the defrosting process into three stages: the start-up stage, the cumulative frost stage, and the frost deterioration stage. By recording the duration of the cumulative frost stage, the actual frost condition of the outdoor heat exchanger is determined, and the conventional defrosting temperature is corrected based on this duration. Factors such as ambient humidity are also incorporated, which makes up for the shortcomings of existing technologies in frost control and avoids high energy consumption of air conditioners, such as no-frost defrosting or heavy frost that does not defrost, poor heating effect, and low energy efficiency.

[0101] In one or more exemplary embodiments, the described functionality may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software as a computer program product, the functionality may be stored or transmitted as one or more instructions or code on or through a computer-readable medium. A computer-readable medium includes both computer storage media and communication media, encompassing any medium that facilitates the transfer of a computer program from one location to another. A storage medium may be any available medium accessible to a computer. By way of example and not limitation, such a computer-readable medium may include RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and is accessible to a computer. Any connection is also legitimately referred to as a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of a medium. As used in this article, disk and disc include compact discs (CDs), laser discs, optical discs, digital multi-purpose discs (DVDs), floppy disks, and Blu-ray discs. Disks typically reproduce data magnetically, while discs reproduce data optically using lasers. Combinations of these should also be included within the scope of computer-readable media.

[0102] It should be noted that the terminology used above is for describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0103] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0104] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0105] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0106] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A defrosting control method, characterized in that, Including the following steps: Unit operation heating mode; Acquire the first temperature parameter detected by the first temperature sensor located at the inlet of the outdoor heat exchanger; acquire the second temperature parameter detected by the second temperature sensor located at the outlet of the outdoor heat exchanger; and acquire the outdoor ambient temperature parameter T. 外 ; When both the first temperature parameter detected by the first temperature sensor and the second temperature parameter detected by the second temperature sensor are within T0±a, timing begins and stops when both the first and second temperature parameters deviate from the range of T0±a, and the duration t is obtained; a is the preset deviation value. Substitute the duration t into the preset frost rate calculation formula to calculate the frost rate z. Determine the current preset defrost interval based on the frost rate z and the current outdoor ambient temperature parameter. Then, determine whether to enter the defrost mode based on the control logic corresponding to the preset defrost interval and the temperature parameter detected by the first or second temperature sensor as the main temperature sensor. The preset frosting rate calculation formula is: z=X / t+b, where X is the preset maximum frosting thickness and b is a preset coefficient; The preset defrosting zones include: non-frost zone, condensation zone, light frost zone, normal frost zone, and heavy frost zone; The main temperature sensor is determined by the following steps: after the heating mode is turned on, the temperature sensor whose detected temperature parameter first drops to T0 among the first and second temperature sensors is selected as the main temperature sensor.

2. The defrosting control method as described in claim 1, characterized in that, Determining the current preset defrosting range based on the frost rate z and the current outdoor ambient temperature parameter specifically includes: When the frosting rate is less than or equal to the preset frosting rate, it is in the non-frosting zone; When the frost rate is greater than the preset frost rate and the outdoor ambient temperature parameter is greater than or equal to the preset temperature, it is in the condensation zone. When the frosting rate is greater than the preset frosting rate and less than or equal to the preset light frosting rate, and the outdoor ambient temperature parameter is less than the preset temperature, it is in the light frosting zone. When the frosting rate is greater than the preset light frosting rate and less than or equal to the preset normal frosting rate, and the outdoor ambient temperature parameter is less than the preset temperature, it is in the normal frosting zone. When the frosting rate is greater than the preset normal frosting rate and the outdoor ambient temperature parameter is less than the preset temperature, it is in the heavy frosting zone.

3. The defrosting control method as described in claim 1, characterized in that, The control logic corresponding to the preset defrosting interval specifically includes: The control logic for the light frost zone is as follows: when the temperature of the main temperature sensor is lower than the preset T... 轻度 At this time, the unit enters defrosting mode; The control logic for the general frosting zone is as follows: when the temperature of the main sensing bulb is lower than the preset T... 一般 When the unit is in a normal frosting zone for more than a preset first time, the unit enters defrosting mode; The control logic for the re-frost zone is as follows: when the temperature of the main temperature sensor is lower than the preset T... 重度 When the unit is in a heavy frost zone for more than a preset second duration, it enters defrosting mode. And T 重度 >T 一般 >T 轻度 The preset second duration is less than the preset first duration.

4. The defrosting control method as described in claim 1, characterized in that, Obtain outdoor ambient temperature parameter T 外 Then, based on the outdoor environmental parameter T 外 The preset ambient temperature range and outdoor environmental parameter T 外 Determine the setting range of T0, and select the setting value of T0 from the determined setting range.

5. The defrosting control method as described in claim 3, characterized in that, Obtain outdoor ambient temperature parameter T 外 Then, based on the outdoor environmental parameter T 外 The preset ambient temperature range and outdoor environmental parameter T 外 Determine T respectively 重度 T 一般 T 轻度 The setting range, and from the determined T 重度 Select T in the setting range 重度 The setting value, from the determined T 一般 Select T in the setting range 一般 The setting value, from the determined T 轻度 Select T in the setting range 轻度 The setting value.

6. The defrosting control method as described in claim 1, characterized in that, The control logic for the condensation zone and the non-frost zone is to prevent them from entering defrosting mode.

7. An air conditioning unit, characterized in that, The defrosting control method according to any one of claims 1 to 6 is used to determine whether defrosting is required.

8. A computer-readable storage medium for storing a computer program, characterized in that, The computer program executes the defrosting control method according to any one of claims 1 to 6 when it runs.

Images