Heat pump defrosting control methods, devices, equipment and storage media

Abstract

This invention relates to the field of heat pump control technology, and discloses a heat pump defrosting control method, apparatus, equipment, and storage medium for improving defrosting energy efficiency. The heat pump defrosting control method includes: acquiring the real-time return gas temperature of the compressor and the current ambient temperature; determining the return gas temperature threshold for entering defrosting based on the relationship between the current ambient temperature and a preset ambient temperature boundary parameter; and controlling the unit to enter defrosting mode when the cumulative running time of the compressor reaches a preset value and the real-time return gas temperature is less than or equal to the return gas temperature threshold.

Description

Technical Field

[0001] This invention relates to the field of heat pump control technology, and in particular to a heat pump defrosting control method, apparatus, equipment, and storage medium. Background Technology

[0002] The existing defrosting control method for air source heat pumps in heating mode generally adopts the method of installing a temperature sensor at a fixed position on the evaporator coil. The frost status is determined by detecting the temperature of the coil at this single point. When the coil temperature is lower than a preset fixed threshold, the unit is controlled to enter defrosting mode. However, due to factors such as uneven refrigerant distribution and differences in airflow between flow paths, the temperature distribution of each flow path in finned heat exchangers is not uniform during actual operation. The temperature sensor on the coil at a fixed position can only reflect the local temperature of a single flow path and cannot represent the overall frosting status of the entire evaporator. This can easily lead to the following technical defects: when the temperature of the flow path where the temperature sensor is located is higher than that of other frosted flow paths, the system will continuously misjudge that there is no frosting, resulting in severe icing of the evaporator or even unit failure and shutdown; when the flow path where the temperature sensor is located cools down first due to insufficient airflow or flow rate, the system will prematurely trigger ineffective defrosting, reducing the unit's energy efficiency; at the same time, the defrosting exit condition also depends on the same temperature sensor, which can easily lead to premature exit when the frost layer in some flow paths has not completely melted, causing a secondary frosting cycle and affecting the reliability and heating performance of the unit. Summary of the Invention

[0003] This invention provides a heat pump defrosting control method, apparatus, equipment, and storage medium to solve the problem of reduced defrosting energy efficiency caused by using a fixed-position coil temperature sensor to detect single-point temperature and using a fixed threshold to determine defrosting in the prior art.

[0004] The first aspect of the present invention provides a heat pump defrosting control method, comprising: acquiring the real-time return gas temperature of the compressor and the current ambient temperature; determining a return gas temperature threshold for entering defrosting based on the relationship between the current ambient temperature and a preset ambient temperature boundary parameter, wherein the ambient temperature boundary parameter is the boundary point between high-temperature operating conditions and low-temperature operating conditions; and controlling the unit to enter defrosting mode when the cumulative running time of the compressor reaches a preset value and the real-time return gas temperature is less than or equal to the return gas temperature threshold.

[0005] In one feasible implementation, determining the return air temperature threshold for entering defrost based on the relationship between the current ambient temperature and a preset ambient temperature boundary parameter includes: determining whether the current ambient temperature is less than the preset ambient temperature boundary parameter; if the current ambient temperature is not less than the preset ambient temperature boundary parameter, then using a preset high-temperature operating condition reference return air temperature as the return air temperature threshold for entering defrost; if the current ambient temperature is less than the preset ambient temperature boundary parameter, then entering a dynamic calculation process to determine the return air temperature threshold for entering defrost.

[0006] In one feasible implementation, the step of entering the dynamic calculation process to determine the return air temperature threshold for entering defrost includes: calculating a compensation amount based on the deviation between the current ambient temperature and the ambient temperature boundary parameter, and a preset return air temperature compensation coefficient; and superimposing the high-temperature operating condition reference return air temperature with the compensation amount to obtain the return air temperature threshold for entering defrost.

[0007] In one feasible implementation, the step of calculating the compensation amount based on the deviation of the current ambient temperature from the ambient temperature boundary parameter and a preset return air temperature compensation coefficient includes: calculating the temperature deviation value of the current ambient temperature relative to the ambient temperature boundary parameter; obtaining a first coefficient and a second coefficient in the preset return air temperature compensation coefficient; and determining the compensation amount based on the proportional relationship between the temperature deviation value and the first coefficient and the second coefficient.

[0008] In one feasible implementation, after the control unit enters the defrost mode, the method further includes: continuously acquiring the real-time return gas temperature of the compressor in the defrost mode; and determining whether the real-time return gas temperature is greater than a preset defrost exit temperature threshold. When the real-time return air temperature is greater than the defrost exit temperature threshold, the unit is controlled to exit the defrost mode.

[0009] In one feasible implementation, after the control unit enters the defrosting mode, the method further includes: recording the current continuous operation time of defrosting in the defrosting mode; determining whether the current continuous operation time of defrosting reaches a preset maximum defrosting time threshold; and controlling the control unit to exit the defrosting mode when the current continuous operation time of defrosting reaches the maximum defrosting time threshold.

[0010] In one feasible implementation, after determining the return gas temperature threshold for entering defrost mode, the method further includes: after the compressor is started, accumulating the continuous operating time in heating mode; comparing the continuous operating time with a preset minimum heating operating time threshold; and determining that the accumulated operating time of the compressor has reached the preset value when the continuous operating time is greater than or equal to the minimum heating operating time threshold.

[0011] A second aspect of the present invention provides a heat pump defrosting control device, comprising: an acquisition module for acquiring the real-time return gas temperature of the compressor and the current ambient temperature; a determination module for determining a return gas temperature threshold for entering defrosting based on the relationship between the current ambient temperature and a preset ambient temperature boundary parameter, wherein the ambient temperature boundary parameter is the boundary point between high-temperature operating conditions and low-temperature operating conditions; and a control module for controlling the unit to enter defrosting mode when the cumulative running time of the compressor reaches a preset value and the real-time return gas temperature is less than or equal to the return gas temperature threshold.

[0012] In one feasible implementation, the determining module includes: a judging unit, used to judge whether the current ambient temperature is less than a preset ambient temperature boundary parameter; a processing unit, used to use a preset high-temperature operating condition reference return air temperature as the return air temperature threshold for entering defrost if the current ambient temperature is not less than the preset ambient temperature boundary parameter; and a calculation unit, used to enter a dynamic calculation process to determine the return air temperature threshold for entering defrost if the current ambient temperature is less than the preset ambient temperature boundary parameter.

[0013] In one feasible implementation, the calculation unit includes: a first calculation subunit, used to calculate a compensation amount based on the deviation between the current ambient temperature and the ambient temperature boundary parameter, and a preset return air temperature compensation coefficient; and a second calculation subunit, used to superimpose the high-temperature operating condition reference return air temperature and the compensation amount to calculate the return air temperature threshold for entering defrost.

[0014] In one feasible implementation, the first calculation subunit is specifically used to: calculate the temperature deviation value of the current ambient temperature relative to the ambient temperature boundary parameter; obtain the first coefficient and the second coefficient in the preset return air temperature compensation coefficient; and determine the compensation amount according to the proportional relationship between the temperature deviation value and the first coefficient and the second coefficient.

[0015] In one feasible implementation, the device further includes: a first exit module, used to continuously acquire the real-time return gas temperature of the compressor in defrost mode; determine whether the real-time return gas temperature is greater than a preset exit defrost temperature threshold; and control the unit to exit defrost mode when the real-time return gas temperature is greater than the exit defrost temperature threshold.

[0016] In one feasible implementation, the device further includes: a second exit module, used to record the current continuous operation time of defrosting in defrosting mode; determine whether the current continuous operation time of defrosting reaches a preset maximum defrosting time threshold; and control the unit to exit defrosting mode when the current continuous operation time of defrosting reaches the maximum defrosting time threshold.

[0017] In one feasible implementation, the device further includes: a judgment module, configured to, after the compressor is started, begin to accumulate the continuous operating time in heating mode; compare the continuous operating time with a preset minimum heating operating time threshold; and, when the continuous operating time is greater than or equal to the minimum heating operating time threshold, determine that the accumulated operating time of the compressor has reached the preset value.

[0018] A third aspect of the present invention provides an electronic device, comprising: a memory and at least one processor, wherein the memory stores instructions; the at least one processor invokes the instructions in the memory to cause the electronic device to perform the above-described heat pump defrosting control method.

[0019] A fourth aspect of the present invention provides a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the above-described heat pump defrosting control method.

[0020] The technical solution provided by this invention involves acquiring the real-time return gas temperature of the compressor and the current ambient temperature; determining the return gas temperature threshold for entering defrost mode based on the relationship between the current ambient temperature and a preset ambient temperature boundary parameter; and controlling the unit to enter defrost mode when the cumulative running time of the compressor reaches a preset value and the real-time return gas temperature is less than or equal to the return gas temperature threshold. In this embodiment of the invention, by acquiring the compressor return gas temperature instead of the traditional single-point temperature of the coil as the determination criterion, the defrost judgment can reflect the overall frosting state of all flow paths in the evaporator, thereby effectively avoiding single-point misjudgment problems caused by uneven refrigerant distribution or airflow deviation. This ensures accurate defrosting triggering under any frosting distribution conditions, avoiding ice accumulation shutdowns due to "inability to enter defrost" and energy waste caused by "entering defrost too early." The return gas temperature threshold for entering defrost mode is dynamically determined based on the relationship between the current ambient temperature and the preset boundary parameter, allowing the defrost trigger point to change with the ambient temperature. Adaptive adjustment ensures that the threshold decreases accordingly with the ambient temperature under low-temperature conditions, thus capturing the frost initiation point under different ambient temperatures. This avoids the problem of "failure to defrost when necessary" under extreme conditions due to a fixed threshold, improving heating reliability across the entire operating range. When the compressor's cumulative running time reaches a preset value and the real-time return gas temperature is lower than or equal to a dynamically determined threshold, the unit enters defrosting mode. Through a combination of dual conditions, the frequency of ineffective defrosting is effectively reduced, the duration of effective heating per cycle is extended, and heat loss caused by frequent or excessive defrosting is reduced, thereby improving energy efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of one embodiment of the heat pump defrosting control method in this invention; Figure 2 This is a schematic diagram of another embodiment of the heat pump defrosting control method in this invention; Figure 3 This is a dynamic compensation curve of the return air temperature threshold for entering defrost as a function of ambient temperature in an embodiment of the present invention. Figure 4 This is a schematic diagram of one embodiment of the heat pump defrosting control device in this invention; Figure 5 This is a schematic diagram of another embodiment of the heat pump defrosting control device in this invention; Figure 6 This is a schematic diagram of one embodiment of the electronic device in this invention. Detailed Implementation

[0022] This invention provides a heat pump defrosting control method, device, equipment, and storage medium. By acquiring the compressor return gas temperature to reflect the overall frost state of the evaporator and dynamically determining the defrosting return gas temperature threshold based on the ambient temperature, defrosting can be precisely triggered, thereby improving defrosting energy efficiency.

[0023] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" or "having" and any variations thereof are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0024] It is understood that the executing entity of this invention can be a heat pump defrosting control device, a terminal, or a server; no specific limitation is made here. This embodiment of the invention will be described using a server as an example.

[0025] For ease of understanding, the specific process of the embodiments of the present invention is described below. Please refer to [link / reference]. Figure 1 One embodiment of the heat pump defrosting control method in this invention includes: 101. Obtain the real-time return gas temperature of the compressor and the current ambient temperature; When the heat pump unit is running in heating mode, the server receives real-time return gas temperature data from a temperature sensor installed near the return gas inlet on the compressor return gas line and forwarded by the controller via a data communication link established with the heat pump unit controller. At the same time, the server receives current ambient temperature data from an ambient temperature sensor installed on the leeward side of the outdoor unit of the heat pump unit or in a well-ventilated location and forwarded by the controller. The server continuously monitors and receives the two sets of temperature data according to a preset sampling period and performs digital filtering on the received raw data to eliminate instantaneous transmission interference.

[0026] 102. Based on the relationship between the current ambient temperature and the preset ambient temperature boundary parameter, determine the return air temperature threshold for entering defrost. The ambient temperature boundary parameter is the boundary point between high-temperature and low-temperature operating conditions. The server compares the current ambient temperature with the locally stored ambient temperature threshold parameter to determine whether the current ambient temperature is lower than the threshold parameter. If the server determines that the current ambient temperature is not lower than the threshold parameter, it directly determines the pre-stored high-temperature operating condition reference return air temperature value as the return air temperature threshold for entering defrost. If the server determines that the current ambient temperature is lower than the threshold parameter, it enters a dynamic calculation process: based on the degree of deviation of the current ambient temperature from the threshold parameter, combined with the preset return air temperature compensation coefficient, it calculates the compensation amount, and then adds the high-temperature operating condition reference return air temperature value to the compensation amount to obtain the return air temperature threshold for entering defrost, which decreases accordingly as the current ambient temperature decreases.

[0027] 103. When the cumulative running time of the compressor reaches the preset value and the real-time return gas temperature is less than or equal to the return gas temperature threshold, the control unit enters the defrosting mode.

[0028] After the compressor starts, the server begins to accumulate the continuous running time in heating mode and compares the accumulated time with the preset minimum heating running time threshold stored locally. At the same time, it continuously receives real-time return gas temperature data from the heat pump unit controller and compares the real-time return gas temperature with the determined return gas temperature threshold. When it is determined that the compressor's accumulated running time has reached or exceeded the preset minimum heating running time threshold, and the real-time return gas temperature is lower than or equal to the defrost return gas temperature threshold, the server generates a defrost start command. The server sends the defrost start command to the heat pump unit controller through a pre-established data communication link. After receiving the command, the controller executes the four-way reversing valve switching action to switch the unit from heating mode to defrost mode, so as to use high-temperature refrigerant to melt and remove the frost layer on the evaporator surface.

[0029] In this embodiment of the invention, the defrost determination is based on the compressor return gas temperature instead of the traditional single-point temperature of the coil. This allows the defrost determination to reflect the overall frosting state of all flow paths in the evaporator, effectively avoiding single-point misjudgments caused by uneven refrigerant distribution or airflow deviation. This ensures accurate defrost triggering under any frosting distribution conditions, preventing ice buildup shutdowns due to "inability to enter defrost" and energy waste caused by "entering defrost too early." The return gas temperature threshold for entering defrost is dynamically determined based on the relationship between the current ambient temperature and a preset boundary parameter, allowing the defrost trigger point to change with the ambient temperature. Adaptive adjustment ensures that the threshold decreases accordingly with the ambient temperature under low-temperature conditions, thus capturing the frost initiation point under different ambient temperatures. This avoids the problem of "failure to defrost when necessary" under extreme conditions due to a fixed threshold, improving heating reliability across the entire operating range. When the compressor's cumulative running time reaches a preset value and the real-time return gas temperature is lower than or equal to a dynamically determined threshold, the unit enters defrosting mode. Through a combination of dual conditions, the frequency of ineffective defrosting is effectively reduced, the duration of effective heating per cycle is extended, and heat loss caused by frequent or excessive defrosting is reduced, thereby improving energy efficiency.

[0030] Please see Figure 2 Another embodiment of the heat pump defrosting control method in this invention includes: 201. Obtain the real-time return gas temperature of the compressor and the current ambient temperature; 202. Determine whether the current ambient temperature is lower than the preset ambient temperature threshold parameter; The server first checks for malfunctions in the ambient temperature sensor. If a malfunction is detected (e.g., the ambient temperature sensor fails to detect the temperature or cannot display the temperature value), fault handling is initiated. If the server determines that the ambient temperature sensor is functioning correctly, it reads a pre-stored ambient temperature boundary parameter from the local configuration file. This boundary parameter represents the dividing point between high-temperature and low-temperature operating conditions. The server then compares the current, filtered ambient temperature value with this boundary parameter. The server executes a conditional judgment: if the current ambient temperature is greater than or equal to the boundary parameter, it is classified as a high-temperature operating condition; if the current ambient temperature is less than the boundary parameter, it is classified as a low-temperature operating condition.

[0031] 203. If the current ambient temperature is not less than the preset ambient temperature boundary parameter, the preset high-temperature operating condition reference return gas temperature shall be used as the return gas temperature threshold for entering defrost. Once the server determines that the current ambient temperature falls under high-temperature operating conditions, it reads the pre-stored high-temperature operating condition baseline return gas temperature from the local configuration database. This baseline return gas temperature is a reference threshold obtained through experimental calibration under standard high-temperature operating conditions. The server directly sets this baseline value as the return gas temperature threshold for entering defrost within the current judgment period, without performing any additional compensation or correction calculations. The server writes this return gas temperature threshold into the threshold storage area in memory and marks its source as a "fixed value for high-temperature operating conditions," while also recording the timestamp of the current threshold's determination.

[0032] When the server determines that the ambient temperature sensor has malfunctioned, it cannot obtain reliable ambient temperature data and therefore cannot select the threshold determination method according to the normal segmentation logic. In this case, the server employs a fault protection strategy: it directly reads the preset high-temperature operating condition baseline return air temperature value as the return air temperature threshold for entering defrost mode, skipping the comparison step between the ambient temperature and the boundary parameter, as well as the dynamic calculation process. The server writes this threshold into the threshold storage area in memory and marks its source as "Ambient Temperature Fault Mode - Using Fixed Baseline Value," while simultaneously recording the fault occurrence timestamp and generating an ambient temperature sensor fault alarm message.

[0033] 204. If the current ambient temperature is less than the preset ambient temperature threshold parameter, the dynamic calculation process is initiated to determine the return air temperature threshold for defrosting.

[0034] The compensation amount is calculated based on the deviation of the current ambient temperature from the ambient temperature boundary parameter and the preset return air temperature compensation coefficient. Specifically, the temperature deviation of the current ambient temperature relative to the ambient temperature boundary parameter is calculated; the first and second coefficients in the preset return air temperature compensation coefficient are obtained; and the compensation amount is determined based on the proportional relationship between the temperature deviation value and the first and second coefficients. The high-temperature operating condition reference return air temperature and the compensation amount are then superimposed to calculate the return air temperature threshold for entering defrost mode. Specifically, the server subtracts the current ambient temperature from the ambient temperature boundary parameter to obtain a positive difference value representing the degree of low temperature deviation; the server reads the first and second coefficients from the preset return air temperature compensation coefficients in the local configuration database, where the first coefficient represents the numerator reference value of the compensation intensity and the second coefficient represents the denominator reference value of the compensation intensity; the server calculates the ratio of the first coefficient to the second coefficient to obtain the compensation ratio factor corresponding to one unit temperature deviation value, and then multiplies the temperature deviation value by the compensation ratio factor to calculate the compensation amount that needs to be deducted from the high-temperature operating condition reference return air temperature under the current operating condition; the server obtains the pre-stored high-temperature operating condition reference return air temperature, subtracts the calculated compensation amount from the high-temperature operating condition reference return air temperature, and obtains the return air temperature threshold for entering defrost, which decreases accordingly as the current ambient temperature decreases.

[0035] Furthermore, in another scenario, a preset low-temperature defrosting cutoff return gas temperature value is obtained. The dynamically calculated return gas temperature threshold for entering defrost is compared with this low-temperature defrosting cutoff return gas temperature value. When the dynamically calculated return gas temperature threshold is lower than the low-temperature defrosting cutoff return gas temperature value, the low-temperature defrosting cutoff return gas temperature value is used instead of the dynamically calculated threshold as the final defrosting entry return gas temperature threshold. Specifically, after the server dynamically calculates the defrosting entry return gas temperature threshold and before using this threshold for defrosting entry judgment, it reads the preset low-temperature defrosting cutoff return gas temperature value from the local configuration database. This cutoff return gas temperature value is a pre-calibrated fixed lower limit temperature value, representing the lowest return gas temperature boundary allowed to trigger defrosting under extreme low-temperature conditions. The server compares the dynamically calculated return gas temperature threshold with the defrost cutoff return gas temperature value under low-temperature conditions. If the dynamically calculated threshold is greater than or equal to the cutoff return gas temperature value, it indicates that the dynamic calculation result is within a safe and reasonable range, and the server directly uses the dynamically calculated threshold as the final defrost return gas temperature threshold. If the dynamically calculated threshold is less than the cutoff return gas temperature value, it indicates that the threshold calculated according to the dynamic formula is lower than the system's preset safety lower limit. Using such a low threshold would make the defrost triggering condition too stringent, and it might not be able to trigger defrost even when the evaporator is severely iced. Therefore, the server uses the low-temperature defrost cutoff return gas temperature value instead of the dynamically calculated threshold as the final defrost return gas temperature threshold. The server stores the final determined threshold in the threshold storage area in memory and marks the source of the threshold as "low-temperature dynamic calculation value corrected by lower limit protection," while also recording the original calculated value and the corrected threshold.

[0036] For example, such as Figure 3As shown, the principle of this dynamic compensation mechanism is as follows: using the ambient temperature boundary parameter D07 as the origin of the coordinate system, the horizontal axis represents the current ambient temperature, and the vertical axis represents the return air temperature threshold for entering defrost. When the ambient temperature equals D07, the return air temperature threshold for entering defrost is the high-temperature operating condition reference return air temperature a before and after compensation. As the ambient temperature gradually decreases and deviates from D07, the return air temperature threshold for entering defrost after compensation decreases linearly according to the preset compensation coefficient, while the fixed threshold a before compensation remains unchanged. The difference between the two gradually increases as the ambient temperature decreases. For example, setting parameters D07 to 2℃, a to -5℃, D08 to 10℃, and D09 to 14℃, when the current ambient temperature is -10℃, the difference between the ambient temperature and D07 is 12℃. The compensation coefficient ratio D08 / D09 is approximately 0.714, and the compensation amount is approximately 8.57℃. Therefore, the compensated threshold temperature b for entering defrost return gas is approximately -13.57℃. When the ambient temperature further decreases to -20℃, the deviation is 22℃, and the compensation amount is approximately 15.7℃. The compensated threshold b decreases to approximately -20.7℃. Simultaneously, a defrost cutoff return gas temperature c for low-temperature operating conditions is also set, with a range from -35℃ to b (i.e., -35 ≤ c).

[0037] 205. When the cumulative running time of the compressor reaches the preset value and the real-time return gas temperature is less than or equal to the return gas temperature threshold, the control unit enters the defrosting mode.

[0038] ​The system determines whether the compressor's cumulative running time has reached a preset value. After the compressor starts, it begins accumulating the continuous running time in heating mode; this continuous running time is compared with a preset minimum heating running time threshold; when the continuous running time is greater than or equal to the minimum heating running time threshold, the system determines that the compressor's cumulative running time has reached the preset value. Specifically, each time the server receives a compressor start signal reported by the heat pump unit controller, it records the timestamp of the start moment and initializes a cumulative timing variable to zero. The server periodically performs a timing accumulation operation at fixed time intervals, adding the duration of the current time interval to the cumulative timing variable each time, thereby obtaining the cumulative continuous running time of the compressor in heating mode. The server reads the preset minimum heating running time threshold from the local configuration file and compares the current value of the cumulative timing variable with the minimum heating running time threshold. When the value of the cumulative time variable has not yet reached the threshold, the server continues to perform periodic time accumulation and comparison operations; when the value of the cumulative time variable is greater than or equal to the minimum heating operation time threshold, the server determines that the cumulative operation time of the compressor has reached the preset value, sets a time condition satisfaction flag in memory, and stops the cumulative timer until the defrosting judgment is completed or the unit exits the heating mode and the timer restarts.

[0039] The system determines whether the real-time return gas temperature is less than or equal to a return gas temperature threshold. Specifically, the real-time return gas temperature is compared with this threshold: if the real-time return gas temperature is greater than the threshold, it indicates that the degree of frost on the evaporator fin surface has not yet significantly affected the system's heating performance, and the server continues to monitor the return gas temperature in a loop, waiting for the temperature to drop further; if the real-time return gas temperature is less than or equal to the threshold, it indicates that frost has caused a severe reduction in the evaporator's heat exchange capacity, and the return gas temperature drops to the trigger line. The server determines that the temperature condition has been met, sets a temperature condition satisfaction flag in memory, and records the current return gas temperature value and the trigger time.

[0040] The server monitors the time and temperature condition flags in memory in real time. When both the time and temperature condition flags are set to "met" and "satisfied," the server determines that all prerequisites for defrosting have been met. The server then generates a defrost start command, which includes a command type identifier, a timestamp, and a unique identifier for the target unit. The server sends the defrost start command to the controller of the corresponding heat pump unit via a pre-established IoT communication link. Upon receiving the command, the controller parses and verifies it; if the command is valid, it executes the defrost action. After entering defrost mode, a defrost exit mechanism is also included. One method is as follows: In defrost mode, the real-time return gas temperature of the compressor is continuously acquired; it is determined whether the real-time return gas temperature exceeds a preset defrost exit temperature threshold; when the real-time return gas temperature exceeds the defrost exit temperature threshold, the unit is controlled to exit defrost mode. Specifically, after the unit enters defrost mode, the server continuously receives real-time return gas temperature data of the compressor reported by the heat pump unit controller through the IoT communication link. In each reporting cycle, the server updates the latest return gas temperature value to the temperature cache in memory. The server reads the preset defrost exit temperature threshold from the local configuration database. This defrost exit temperature threshold is a pre-calibrated fixed temperature value, representing the safe level that the return gas temperature should reach when the frost layer on the evaporator surface has basically melted. The server compares the real-time return gas temperature with the exit threshold in each sampling cycle: if the real-time return gas temperature has not yet reached or exceeded the exit threshold, it indicates that the frost layer on the evaporator surface is still melting, and the server continues to monitor and wait; if the real-time return gas temperature is greater than the exit threshold, it indicates that the frost layer on the evaporator fin surface has been basically melted, the heat exchange capacity has returned to normal, and the server determines that the exit condition is met. The server then generates a defrost exit command and sends it to the heat pump unit controller through the communication link. After receiving the command, the controller executes the exit action.

[0041] Another approach is as follows: In defrost mode, record the current defrost duration; determine if the current defrost duration has reached the preset maximum defrost time threshold; when the current defrost duration reaches the maximum defrost time threshold, control the unit to exit defrost mode. Specifically, when the unit enters defrost mode, the server starts an independent defrost timer, which accumulates the current defrost cycle duration with millisecond precision, starting from zero. The server reads the preset maximum defrost time threshold from the local configuration database. This threshold is a pre-set safety protection time value, representing the longest allowed duration of a single defrost process. In each sampling period, the server compares the current accumulated value of the defrost timer with the maximum defrost time threshold: if the current accumulated value has not yet reached the threshold, it indicates that the defrost process is still within the allowed time range, and the server continues to keep the unit in defrost mode and continues to accumulate the timer; if the current accumulated value is greater than or equal to the threshold, it indicates that the defrost process has reached or exceeded the preset maximum allowed duration, and even if the return air temperature has not yet reached the exit threshold, the server determines that the timeout exit condition is met. The server then generates a defrost forced exit command, which is sent to the heat pump unit controller via the IoT communication link. After receiving the command, the controller executes the forced exit action.

[0042] In this embodiment of the invention, the overall frosting state of each flow path of the evaporator is reflected by obtaining the compressor return gas temperature, thus avoiding the problem of single-point misjudgment caused by uneven refrigerant distribution or airflow deviation. It determines whether the current ambient temperature is lower than the preset boundary parameter. Under high-temperature conditions, a fixed reference return gas temperature threshold is directly used. Under low-temperature conditions, a dynamic calculation process is entered to determine the return gas temperature threshold that decreases as the ambient temperature decreases, so that the defrosting trigger point can adapt to different environmental conditions. When the compressor's cumulative running time reaches the target and the real-time return gas temperature is lower than or equal to the dynamically determined threshold, defrosting is initiated. By judging the dual conditions, the frequency of ineffective defrosting is effectively reduced, and the effective heating time of a single cycle is extended. Thus, reliable heating and improved energy efficiency are achieved across the entire operating range while avoiding ice accumulation shutdowns and energy waste.

[0043] The above describes the heat pump defrosting control method in the embodiments of the present invention. The following describes the heat pump defrosting control device in the embodiments of the present invention. Please refer to [link / reference]. Figure 4 One embodiment of the heat pump defrosting control device in this invention includes: The acquisition module 401 is used to acquire the real-time return gas temperature of the compressor and the current ambient temperature; The determination module 402 is used to determine the return air temperature threshold for entering defrost based on the relationship between the current ambient temperature and the preset ambient temperature boundary parameter. The ambient temperature boundary parameter is the boundary point between high temperature and low temperature operating conditions. The control module 403 is used to control the unit to enter the defrosting mode when the cumulative running time of the compressor reaches a preset value and the real-time return gas temperature is less than or equal to the return gas temperature threshold.

[0044] In this embodiment of the invention, by obtaining the compressor return gas temperature instead of the traditional single-point temperature of the coil, the defrosting judgment can reflect the overall frosting state of each flow path of the evaporator, thereby effectively avoiding the problem of single-point misjudgment caused by uneven refrigerant distribution or airflow deviation. This avoids the ice accumulation shutdown caused by "inability to enter defrosting" and the energy waste caused by "entering defrosting too early". By dynamically determining the return gas temperature threshold for entering defrosting based on the relationship between the current ambient temperature and the preset boundary parameter, the defrosting trigger point is adaptively adjusted with the ambient temperature, ensuring that the threshold is reduced accordingly under low-temperature conditions, avoiding the problem of "not defrosting when it should" under extreme conditions with a fixed threshold. When the cumulative running time reaches the target and the return gas temperature is lower than or equal to the dynamic threshold, defrosting is initiated. By judging the dual conditions, the frequency of ineffective defrosting is reduced, the heating time is extended, and energy efficiency is maximized.

[0045] Please see Figure 5 Another embodiment of the heat pump defrosting control device in this invention includes: The acquisition module 401 is used to acquire the real-time return gas temperature of the compressor and the current ambient temperature; The determination module 402 is used to determine the return air temperature threshold for entering defrost based on the relationship between the current ambient temperature and the preset ambient temperature boundary parameter. The ambient temperature boundary parameter is the boundary point between high temperature and low temperature operating conditions. The control module 403 is used to control the unit to enter the defrosting mode when the cumulative running time of the compressor reaches a preset value and the real-time return gas temperature is less than or equal to the return gas temperature threshold.

[0046] Optionally, the determining module 402 includes: Judgment unit 4021 is used to determine whether the current ambient temperature is lower than the preset ambient temperature threshold parameter; The processing unit 4022 is used to use the preset high-temperature operating condition reference return gas temperature as the return gas temperature threshold for entering defrost if the current ambient temperature is not less than the preset ambient temperature boundary parameter. The calculation unit 4023 is used to enter a dynamic calculation process to determine the return air temperature threshold for defrosting if the current ambient temperature is less than the preset ambient temperature boundary parameter.

[0047] Optionally, the computing unit 4023 includes: The first calculation subunit 40231 is used to calculate the compensation amount based on the degree of deviation between the current ambient temperature and the ambient temperature boundary parameter, as well as the preset return air temperature compensation coefficient. The second calculation subunit 40232 is used to superimpose the high-temperature operating condition reference return gas temperature and the compensation amount to calculate the return gas temperature threshold for entering defrost.

[0048] Optionally, the first computational subunit 40231 can be specifically used for: Calculate the temperature deviation of the current ambient temperature relative to the ambient temperature boundary parameter; obtain the first and second coefficients in the preset return air temperature compensation coefficients; determine the compensation amount based on the proportional relationship between the temperature deviation and the first and second coefficients.

[0049] Optionally, the heat pump defrosting control device also includes: The first exit module 404 is used to continuously acquire the real-time return gas temperature of the compressor in defrost mode; determine whether the real-time return gas temperature is greater than the preset exit defrost temperature threshold; and control the unit to exit defrost mode when the real-time return gas temperature is greater than the exit defrost temperature threshold.

[0050] Optionally, the heat pump defrosting control device also includes: The second exit module 405 is used to record the current continuous operation time of defrosting in defrosting mode; determine whether the current continuous operation time of defrosting has reached the preset maximum defrosting time threshold; and control the unit to exit defrosting mode when the current continuous operation time of defrosting reaches the maximum defrosting time threshold.

[0051] Optionally, the heat pump defrosting control device also includes: The judgment module 406 is used to start accumulating the continuous running time in heating mode after the compressor is started; compare the continuous running time with the preset minimum heating running time threshold; when the continuous running time is greater than or equal to the minimum heating running time threshold, it is determined that the cumulative running time of the compressor has reached the preset value.

[0052] In this embodiment of the invention, the overall frosting state of each flow path of the evaporator is reflected by obtaining the compressor return gas temperature, thus avoiding the problem of single-point misjudgment caused by uneven refrigerant distribution or airflow deviation. It determines whether the current ambient temperature is lower than the preset boundary parameter. Under high-temperature conditions, a fixed reference return gas temperature threshold is directly used. Under low-temperature conditions, a dynamic calculation process is entered to determine the return gas temperature threshold that decreases as the ambient temperature decreases, so that the defrosting trigger point can adapt to different environmental conditions. When the compressor's cumulative running time reaches the target and the real-time return gas temperature is lower than or equal to the dynamically determined threshold, defrosting is initiated. By judging the dual conditions, the frequency of ineffective defrosting is effectively reduced, and the effective heating time of a single cycle is extended. Thus, reliable heating and improved energy efficiency are achieved across the entire operating range while avoiding ice accumulation shutdowns and energy waste.

[0053] above Figure 4 and Figure 5 The heat pump defrosting control device in the embodiments of the present invention will be described in detail from the perspective of modular functional entities. The electronic equipment in the embodiments of the present invention will be described in detail from the perspective of hardware processing.

[0054] See Figure 6 As shown, the electronic device includes a processor 600 and a memory 601. The memory 601 stores machine-executable instructions that can be executed by the processor 600. The processor 600 executes the machine-executable instructions to implement the above-described heat pump defrosting control method.

[0055] Furthermore, Figure 6 The electronic device shown also includes a bus 602 and a communication interface 603. The processor 600, the communication interface 603 and the memory 601 are connected via the bus 602.

[0056] The memory 601 may include high-speed random access memory (RAM) and may also include non-volatile memory, such as at least one disk storage device. Communication between this system network element and at least one other network element is achieved through at least one communication interface 603 (which can be wired or wireless), such as the Internet, wide area network, local area network, metropolitan area network, etc. The bus 602 may be an ISA bus, PCI bus, or EISA bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 6 The symbol is represented by a single double-headed arrow, but this does not mean that there is only one bus or one type of bus.

[0057] The processor 600 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed by the integrated logic circuitry in the hardware of the processor 600 or by instructions in software form. The processor 600 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this disclosure. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this disclosure can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory 601. Processor 600 reads the information in memory 601 and, in conjunction with its hardware, completes the method steps of the aforementioned embodiment.

[0058] The present invention also provides an electronic device, the computer device including a memory and a processor, the memory storing computer-readable instructions, which, when executed by the processor, cause the processor to perform the steps of the heat pump defrosting control method in the above embodiments.

[0059] The present invention also provides a computer-readable storage medium, which may be a non-volatile computer-readable storage medium or a volatile computer-readable storage medium, wherein the computer-readable storage medium stores instructions that, when executed on a computer, cause the computer to perform the steps of the heat pump defrosting control method.

[0060] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0061] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0062] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat pump defrosting control method, characterized in that, The heat pump defrosting control method includes: Obtain the real-time return gas temperature of the compressor and the current ambient temperature; Based on the relationship between the current ambient temperature and the preset ambient temperature boundary parameter, the return air temperature threshold for entering defrost is determined, where the ambient temperature boundary parameter is the boundary point between high-temperature and low-temperature operating conditions. When the cumulative running time of the compressor reaches a preset value and the real-time return gas temperature is less than or equal to the return gas temperature threshold, the control unit enters the defrosting mode.

2. The heat pump defrosting control method according to claim 1, characterized in that, The step of determining the return air temperature threshold for entering defrost based on the relationship between the current ambient temperature and a preset ambient temperature boundary parameter includes: Determine whether the current ambient temperature is lower than a preset ambient temperature threshold parameter; If the current ambient temperature is not less than the preset ambient temperature threshold parameter, then the preset high-temperature operating condition reference return gas temperature is used as the return gas temperature threshold for entering defrost. If the current ambient temperature is less than the preset ambient temperature threshold parameter, then a dynamic calculation process is initiated to determine the return air temperature threshold for defrosting.

3. The heat pump defrosting control method according to claim 2, characterized in that, The process of entering the dynamic calculation flow to determine the return air temperature threshold for entering defrost includes: The compensation amount is calculated based on the degree of deviation between the current ambient temperature and the ambient temperature boundary parameter, and the preset return air temperature compensation coefficient. The high-temperature operating condition reference return air temperature is superimposed with the compensation amount to calculate the return air temperature threshold for entering defrost.

4. The heat pump defrosting control method according to claim 3, characterized in that, The calculation of the compensation amount based on the deviation between the current ambient temperature and the ambient temperature boundary parameter, and a preset return air temperature compensation coefficient, includes: Calculate the temperature deviation of the current ambient temperature relative to the ambient temperature boundary parameter; Obtain the first and second coefficients from the preset return gas temperature compensation coefficients; The compensation amount is determined based on the proportional relationship between the temperature deviation value and the first and second coefficients.

5. The heat pump defrosting control method according to claim 1, characterized in that, After the control unit enters defrost mode, it also includes: In defrost mode, the real-time return gas temperature of the compressor is continuously acquired; Determine whether the real-time return air temperature is greater than the preset defrost exit temperature threshold. When the real-time return air temperature is greater than the defrost exit temperature threshold, the unit is controlled to exit the defrost mode.

6. The heat pump defrosting control method according to claim 1, characterized in that, After the control unit enters defrost mode, it also includes: In defrost mode, record the current defrost duration. Determine whether the current defrosting duration has reached a preset maximum defrosting time threshold; When the current defrosting duration reaches the maximum defrosting time threshold, the control unit exits the defrosting mode.

7. The heat pump defrosting control method according to claim 1, characterized in that, After determining the return air temperature threshold for defrosting, the following steps are also included: After the compressor starts, the continuous running time in heating mode begins to accumulate; The continuous operating time is compared with a preset minimum heating operating time threshold. When the continuous running time is greater than or equal to the minimum heating running time threshold, it is determined that the cumulative running time of the compressor has reached the preset value.

8. A heat pump defrosting control device, characterized in that, The heat pump defrosting control device includes: The acquisition module is used to acquire the real-time return gas temperature of the compressor and the current ambient temperature; The determination module is used to determine the return air temperature threshold for entering defrost based on the relationship between the current ambient temperature and the preset ambient temperature boundary parameter, wherein the ambient temperature boundary parameter is the boundary point between high temperature conditions and low temperature conditions. The control module is used to control the unit to enter the defrosting mode when the cumulative running time of the compressor reaches a preset value and the real-time return gas temperature is less than or equal to the return gas temperature threshold.

9. An electronic device, characterized in that, The electronic device includes: a memory and at least one processor, wherein the memory stores instructions; The at least one processor invokes the instructions in the memory to cause the electronic device to perform the heat pump defrosting control method as described in any one of claims 1-7.

10. A computer-readable storage medium storing instructions thereon, characterized in that, When the instruction is executed by the processor, it implements the heat pump defrosting control method as described in any one of claims 1-7.

Images