Heat pump dual-system defrosting control method and device, computer device, and storage medium

Abstract

The present application belongs to the field of heat pump air conditioner, and relates to a heat pump double-system defrosting control method and device, computer equipment and storage medium. The method comprises: collecting real-time operation parameters and establishing a heating operation benchmark; when the first system meets the comprehensive defrosting condition, locking the real-time environment temperature value and sending a frequency locking signal to the second system; the first system switches to the defrosting mode at a reduced frequency, and the second system freezes the current operation frequency after receiving the frequency locking signal; during the defrosting of the first system, the second system maintains the frozen frequency operation and continuously monitors its own operation parameters; after the first system switches back to the heating mode, the frequency locking state and the environment temperature locking state of the second system are maintained for a preset time; the frequency locking and the environment temperature locking are released in stages, and a defrosting shielding timer is started for the system that completes defrosting. The heat loss and the waste of electric energy caused by frost-free defrosting are avoided; when facing complex and variable actual working conditions, stability and reliability can be maintained.

Description

Technical Field

[0001] This invention relates to the field of heat pump air conditioning technology, and in particular to a defrosting control method, device, computer equipment, and storage medium for a dual-system heat pump. Background Technology

[0002] In low-temperature and high-humidity environments, the evaporator fins of heat pump units are prone to frost formation, which seriously affects heat exchange efficiency and heating capacity. Therefore, defrosting control is one of the core challenges of heat pump technology.

[0003] In existing technologies, dual-system heat pump units typically contain two independent refrigeration cycles (a first system and a second system), sharing or separating water circuit systems. In heating mode, the two systems operate in parallel to provide heat. Existing defrosting control logic mostly determines whether frost has formed based on the difference between the pipe temperature of a single system and the ambient temperature (ring fin temperature difference).

[0004] The shortcomings of existing technology:

[0005] Frostless defrosting issue: In variable frequency heat pumps, when the water temperature approaches the target temperature, the compressor automatically reduces its frequency to decrease heat output based on the temperature-reaching frequency reduction logic. When one system (such as the first system) enters defrosting mode because it meets the frosting conditions, its four-way valve reverses, and the system switches to cooling operation, which causes the water circuit temperature to drop. The rapid drop in water temperature triggers the PID control logic of another system (the second system), causing it to mistakenly determine that it needs to increase heating capacity to maintain the water temperature, thus commanding the compressor to rapidly increase its frequency. The rapid frequency increase of the second system causes its own evaporator pipe temperature to drop sharply. At the same time, the heat released by the first system during defrosting will locally increase the ambient temperature. This dual effect of "reduced pipe temperature and increased ambient temperature" artificially amplifies the difference between ambient temperature and fin temperature in the second system, reaching the defrosting trigger threshold, causing it to mistakenly enter defrosting mode without actually frosting.

[0006] Risks of repeated defrosting and compressor damage: The above misjudgment can lead to both systems falling into a cycle of repeated defrosting in a "repair" manner. Frequent four-way reversing and pressurized starts will cause huge mechanical and electrical shocks to the compressor, severely shortening its lifespan and even causing instantaneous compressor damage.

[0007] Large fluctuations in water temperature and poor comfort: Simultaneous or frequent alternating defrosting of the dual systems can cause large fluctuations in the water supply temperature, which seriously affects the heating comfort of users. Summary of the Invention

[0008] To solve the above-mentioned technical problems, the present invention provides a defrosting control method for a dual-system heat pump, which adopts the following technical solution, including the following steps:

[0009] Collect real-time operating parameters and establish a heating operation benchmark;

[0010] When the first system meets the comprehensive defrosting conditions, it locks the real-time ambient temperature value and sends a frequency lock signal to the second system.

[0011] The first system switches to defrost mode by reducing the frequency, while the second system freezes the current operating frequency after receiving the frequency lock signal;

[0012] During the defrosting of the first system, the second system maintains the freezing frequency and continuously monitors its own operating parameters;

[0013] After the first system switches back to heating mode, the second system maintains its frequency lock state and ambient temperature lock state for a preset time.

[0014] The frequency lock and ambient temperature lock are unlocked in stages, and a defrost shield timer is started for the system that has completed defrosting.

[0015] Preferably, the step of collecting real-time operating parameters and establishing a heating operation benchmark specifically includes:

[0016] Real-time collection of water temperature and target temperature Calculate the temperature difference

[0017] According to temperature difference The operating frequency of the two compressors is adjusted using a PID algorithm. The formula is:

[0018] ,in: Compressor operating frequency (unit: Hz) Reference frequency (unit: Hz) The proportional gain determines the response speed.

[0019] Integral coefficients, used to eliminate steady-state errors. Differential coefficients are used to suppress overshoot and fluctuations. Temperature difference :time;

[0020] With preset period Continuously record the temperature of the first system pipe Second system pipe temperature Calculate the rate of temperature drop in the tube. Collect raw ambient temperature data. The filtered ambient temperature was obtained using a moving average filtering algorithm. ,in: : Ambient temperature after filtering : Data queue length, : No. A sampled ambient temperature value.

[0021] Preferably, the step of locking the real-time ambient temperature value and sending a frequency lock signal to the second system when the first system meets the comprehensive defrosting conditions specifically includes:

[0022] For the first system to enter defrost mode, the following conditions must be met simultaneously: the cumulative running time of the compressor is greater than the minimum heating time. Pipe temperature Below the frosting temperature threshold Pipe temperature drop rate continuous The number of cycles exceeded the preset rate threshold;

[0023] When the first system meets the defrosting conditions, the main control program marks the defrosting status flag for the first system, locks the power supply circuit of the four-way valve coil, and sends an interrupt signal to the second system.

[0024] Record the filtered ambient temperature value at the moment the first system enters the defrost state.

[0025] Write to the read-only register.

[0026] Preferably, the step of the first system switching to defrost mode by reducing its frequency, while the second system freezes its current operating frequency after receiving the frequency lock signal, specifically includes:

[0027] The first system compressor descends at a preset slope. Smoothly reduce frequency to the safe switching frequency of the reversing valve When the frequency drops to Then, the four-way valve reverses, switching the first system to a refrigeration cycle, and then the compressor rises at a preset incline. Increase to defrost-specific frequency ;

[0028] As the first system begins to reduce its frequency, the main control program pauses the PID controller of the second system, forcibly locking the operating frequency of the second system to the current value. The inverter frequency setpoint is set to a constant. .

[0029] Preferably, the step of the second system maintaining the freezing frequency and continuously monitoring its own operating parameters during the defrosting of the first system specifically includes:

[0030] During the second system frequency lockout, exhaust temperature is continuously monitored. Low pressure

[0031] and pipe temperature When the monitored value exceeds the protection threshold, the frequency lock is temporarily released to perform the protection action. If the first system has not finished defrosting after the parameters return to normal, the lock is re-locked.

[0032] The thermal inertia of the water in the water system is used to buffer the drop in outlet water temperature caused by the cooling of the first system.

[0033] Monitor the temperature of the evaporator coil in the first system. The upward trend, when Rise to defrost termination temperature If the defrosting process continues for more than the preset time, the defrosting is considered complete.

[0034] Preferably, after the first system switches back to heating mode, the step of maintaining the frequency lock state and ambient temperature lock state of the second system for a preset time specifically includes:

[0035] The first system compressor reduces its frequency to a safe commutation frequency. The four-way valve reverses, switching the first system back to heating mode;

[0036] After the first system completes its commutation, the second system maintains its frequency lock state for a preset duration. Start the timer; within the preset delay time, the defrosting logic will still use the locked ambient temperature value. Once the ambient temperature returns to its true level, the lock will be released, and the real-time filter value will resume operation. .

[0038] Preferably, the step of phasedly unlocking the frequency lock and ambient temperature lock, and starting the defrost shield timer for the system after defrosting, specifically includes:

[0039] The first system exits defrost and remains in place for a period of time. Then, unlock the second system frequency and switch to the currently locked frequency. As the initial value for PID regulation, the PID automatic regulation function is gradually restored with a gradual rate limit.

[0040] At the moment the first system exits defrost, start the defrost shield timer and set the timer duration.

[0041] The system forcibly prevents the first system from re-entering defrosting before the timer reaches zero.

[0042] An interlocking mechanism is constructed using status flags and independent masking timers to ensure that at most one system is in defrost mode at any given time, and that each system has a mandatory rest period after defrosting.

[0043] To address the aforementioned technical problems, the present invention also provides a heat pump dual-system defrosting control device, which employs the following technical solution, including:

[0044] The baseline operation and frosting prediction module is used to collect real-time operating parameters and establish a heating operation baseline;

[0045] The defrosting entry judgment and system isolation module is used to lock the real-time ambient temperature value and send a frequency lock signal to the second system when the first system meets the comprehensive defrosting conditions.

[0046] The defrosting switching and inter-system frequency freezing module is used for the first system to switch to defrosting mode by reducing its frequency, while the second system freezes its current operating frequency after receiving the frequency locking signal.

[0047] The collaborative operation and status maintenance module is used to maintain the freezing frequency of the second system during the defrosting of the first system and to continuously monitor its own operating parameters.

[0048] The defrost exit and system recovery preparation module is used to maintain the frequency lock state and ambient temperature lock state of the second system for a preset time after the first system switches back to heating mode.

[0049] The full parameter recovery and interlock protection module is used to unlock the frequency lock and ambient temperature lock in stages, and to start the defrost shield timer for the system after defrosting.

[0050] To address the aforementioned technical problems, the present invention also provides a computer device that employs the technical solution described below, comprising a memory and a processor. The memory stores computer-readable instructions, and the processor executes the computer-readable instructions to implement the steps of the aforementioned heat pump dual-system defrosting control method.

[0051] To address the aforementioned technical problems, the present invention also provides a computer-readable storage medium, which employs the technical solution described below. The computer-readable storage medium stores computer-readable instructions, which, when executed by a processor, implement the steps of the aforementioned heat pump dual-system defrosting control method.

[0052] Compared with the prior art, the present invention has the following main advantages:

[0053] (1) By locking the ambient temperature and freezing the frequency of different systems, the interference path of defrosting of one system on the frost criterion of another system is cut off, ensuring the authenticity and necessity of the defrosting action;

[0054] (2) By introducing a defrost interval timer, the system is forced to have sufficient rest and stable operation time after defrosting, avoiding frequent start-stop and pressurized reversing of the compressor, and significantly extending the service life of the compressor and the four-way reversing valve.

[0055] (3) By freezing the frequency of the different systems, the non-defrosting system can provide heat continuously and stably, making up for the heat loss caused by the defrosting system, controlling the water temperature fluctuation during the entire defrosting process within a very small range, and greatly improving the user's heating experience.

[0056] (4) By accurately judging the entry and exit of defrosting, the heat loss and energy waste caused by defrosting without frost are avoided, and the stable operating state keeps the unit at a high energy efficiency level.

[0057] (5) Through multi-level protection logic such as protective unlocking, pressure monitoring and parameter filtering algorithms, the control system can still maintain high stability and reliability when facing complex and ever-changing actual working conditions. Attached Figure Description

[0058] To more clearly illustrate the solutions in this invention, the accompanying drawings used in the description of the embodiments of this invention will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0059] Figure 1 This is a flowchart of an embodiment of the heat pump dual-system defrosting control method of the present invention;

[0060] Figure 2 This is a sequence diagram of the operation of the first and second systems in the heat pump dual-system defrosting control method of the present invention.

[0061] Figure 3 This is a schematic diagram of the structure of one embodiment of the heat pump dual-system defrosting control device of the present invention;

[0062] Figure 4 This is a schematic diagram of the structure of an embodiment of the computer device of the present invention. Detailed Implementation

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings are used to distinguish different objects and not to describe a particular order.

[0064] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0065] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0066] It should be noted that the heat pump dual-system defrosting control method provided in the embodiments of the present invention is generally executed by the server / terminal device, and correspondingly, the heat pump dual-system defrosting control device is generally installed in the server / terminal device.

[0067] It should be understood that the number of terminal devices, networks, and servers is merely illustrative. Depending on implementation needs, any number of terminal devices, networks, and servers can be used.

[0068] Example 1

[0069] Please refer to Figure 1 A flowchart illustrating an embodiment of the heat pump dual-system defrosting control method of the present invention is shown. The heat pump dual-system defrosting control method includes the following steps:

[0070] Step S1: Collect real-time operating parameters and establish a heating operation benchmark.

[0071] In this embodiment, the electronic device (e.g., a server / terminal device) running on the heat pump dual-system defrost control method can receive heat pump dual-system defrost control requests via wired or wireless connection. It should be noted that the aforementioned wireless connection methods may include, but are not limited to, 3G / 4G / 5G connections, WiFi connections, Bluetooth connections, WiMAX connections, Zigbee connections, UWB (ultra-wideband) connections, and other currently known or future-developed wireless connection methods.

[0072] In this embodiment, step S1, collecting real-time operating parameters and establishing a heating operation benchmark, may specifically include the following steps:

[0073] S11, real-time acquisition of outlet water temperature and target temperature Calculate the temperature difference According to temperature difference The operating frequency of the two compressors is adjusted using a PID algorithm. The formula is: ,in: Compressor operating frequency (unit: Hz) Reference frequency (unit: Hz) The proportional gain determines the response speed. Integral coefficients, used to eliminate steady-state errors. Differential coefficients are used to suppress overshoot and fluctuations. Temperature difference :time.

[0074] Step S11 involves adjusting the target temperature difference. The specific adjustment logic could be: when... When the system outputs a positive adjustment, the compressor increases its frequency, up to the rated upper limit frequency. (e.g., 120Hz) to rapidly heat up; when At this time, the system outputs a negative adjustment, and the compressor frequency drops to the maintenance frequency. (e.g., 40-60Hz), reduce heating output to prevent water temperature overshoot; when At that time, the compressor drops to its lowest frequency. (e.g., 20Hz) Running or standby.

[0075] S12, with a preset period Continuously record the temperature of the first system pipe Second system pipe temperature

[0076] Calculate the rate of temperature drop in the tube. Step S12 involves monitoring pipe temperature trends. Pipe temperature sensors are placed at key points on the evaporator fins of each system. and The main control board continuously records pipe temperature data every 30 seconds and calculates the rate of temperature drop per unit time. By monitoring Predict the frosting speed, if Exceeding the preset threshold This indicates that the evaporator's heat exchange efficiency is rapidly declining, showing a tendency to frost. This data will serve as a reference weight for subsequent defrosting conditions, but it is not the sole criterion, to avoid misjudgments caused by a single temperature threshold.

[0077] S13, Collect raw ambient temperature data The filtered ambient temperature was obtained using a moving average filtering algorithm. ,in: : Ambient temperature after filtering : Data queue length, : No. A sampled ambient temperature value.

[0078] Step S13 involves ambient temperature acquisition and filtering. In practice, an ambient temperature sensor is installed inside a louver on the back of the unit, away from direct sunlight and wind. The collected raw data is processed using a moving average filtering algorithm to eliminate spikes caused by occasional factors such as instantaneous wind speed and sunlight. A data queue of length 10 is established, and new data is sampled each time. Then, place it at the tail of the queue, remove the oldest data from the front of the queue, and then calculate the arithmetic mean of all data in the queue:

[0079] The filtered It serves as the reference value for defrosting logic judgment and ambient temperature locking, ensuring the stability of the control logic.

[0080] The purpose of step S1 is to establish the basic logic for the normal heating operation of the unit and to make a preliminary judgment on the frosting trend based on real-time data, so as to provide a data benchmark for subsequent precise defrosting.

[0081] Step S2: When the first system meets the comprehensive defrosting conditions, the real-time ambient temperature value is locked, and a frequency lock signal is sent to the second system.

[0082] In this embodiment, step S2, when the first system meets the comprehensive defrosting conditions, locking the real-time ambient temperature value and sending a frequency locking signal to the second system, may specifically include the following steps:

[0083] S21, to determine whether the first system needs to enter defrost mode, the following conditions must be met simultaneously: the cumulative running time of the compressor is greater than the minimum heating time. Pipe temperature Below the frosting temperature threshold Pipe temperature drop rate

[0084] continuous The number of cycles exceeded the preset rate threshold.

[0085] Step S21 integrates logic and judgment, determining that the first system must simultaneously meet three conditions to enter defrosting:

[0086] a) The compressor's cumulative running time is greater than the minimum heating time. Minutes, to prevent frequent starts and stops;

[0087] b) Pipe temperature Below the frosting temperature threshold ;

[0088] c) Rate of temperature drop in the tube Exceeding the preset rate threshold for three consecutive cycles (i.e., 90 seconds) The system employs nested conditional judgments, similar to those used in logic gate circuits or software programming, to determine that the first system truly requires defrosting only when all conditions are true simultaneously.

[0089] S22, when the first system meets the defrosting conditions, the main control program marks the defrosting status flag for the first system, locks the power supply circuit of the four-way valve coil, and sends an interrupt signal to the second system.

[0090] Step S22 involves system status marking and resource locking. Once the first system meets the defrosting conditions, the main control program immediately marks the first system with a defrosting status flag (Flag_A=1) in memory. A high-level signal is sent through the MCU's GPIO port to lock the four-way valve coil power supply circuit, ensuring that no other logic can change its state before defrosting ends. Simultaneously, an interrupt signal is sent to the second system, notifying it that it is about to enter frequency locking state.

[0091] S23, record the filtered ambient temperature value at the moment the first system enters defrosting mode. Write to the read-only register.

[0092] Step S23 involves real-time ambient temperature locking. This occurs the instant the first system enters defrost mode ( The main control program records the ambient temperature value after filtering at this moment.

[0093] Write this value into a specific read-only register. During the subsequent defrosting process, all logical checks requiring ambient temperature (including the secondary system's defrosting prevention criterion) will invoke this locked value. rather than changing in real time This fundamentally eliminates the risk of the ambient temperature being artificially high due to defrosting heat dissipation, which could then mislead the secondary system into entering defrosting mode.

[0094] The purpose of step S2 is to accurately identify the actual defrosting needs of a single system and activate the system isolation and protection mechanism as soon as defrosting is triggered to prevent interference.

[0095] Step S3: The first system switches to defrost mode by reducing its frequency, while the second system freezes its current operating frequency after receiving the frequency lock signal.

[0096] In this embodiment, step S3, where the first system switches to defrost mode by reducing its frequency, and the second system freezes its current operating frequency after receiving a frequency lock signal, may specifically include the following steps:

[0097] S31, the first system compressor descends at a preset slope. Smoothly reduce frequency to the safe switching frequency of the reversing valve .

[0098] Step S31 prepares for compressor frequency reduction. Before switching, the compressor first reduces its frequency according to the set descent rate, as shown in step S31. Smoothly reduce the frequency until the safe switching frequency allowed by the reversing valve is reached, such as... The frequency ramp function of the variable frequency drive is used to control the compressor current and gradually reduce the speed. This is to reduce the risk of liquid slugging and mechanical stress caused by directly stopping or reversing the compressor under high pressure differential.

[0099] S32, when the frequency drops to Then, the four-way valve reverses, switching the first system to a refrigeration cycle, and then the compressor rises at a preset incline. Increase to defrost-specific frequency .

[0100] Step S3.2 performs four-way valve reversal and frequency boost defrosting. When the frequency drops to...

[0101] Then, the main control board cuts off the current to the four-way valve coil, causing the valve core to actuate, and the first system switches from heating to cooling (the outdoor evaporator becomes the condenser). After the reversal is complete, the compressor resumes operation at the rising slope as follows: Increase to defrost-specific frequency Defrosting frequency

[0102] This is not a fixed value; it can be locked based on the ambient temperature. Make corrections:

[0103] when hour, ;

[0104] when hour, ;

[0105] when hour, .

[0106] Switching between front and back, the system monitors high and low pressure using pressure sensors to ensure the pressure difference remains within a safe range before increasing the frequency.

[0107] S33, at the same time the first system begins to reduce its frequency, the main control program pauses the PID regulator of the second system, forcibly locking the operating frequency of the second system to the current value. The inverter frequency setpoint is set to a constant. .

[0108] Step S33 performs inter-system frequency hard lockout. Simultaneously with the first system starting frequency reduction commutation, the main control program issues a frequency freeze command to the second system. The second system's PID controller is paused, and its operating frequency is forcibly locked at the current value. By disabling the PID controller output through software, the frequency setpoint of the frequency converter is directly set to a constant. Even if the water temperature is affected by the reversing of the cooling in the first system at this time... The frequency begins to decrease, and the second system will not detect this change (or will not respond after detecting it), thus preventing abnormal frequency increase caused by the reverse triggering of the temperature-controlled frequency reduction logic.

[0109] Step S3 is to safely switch the defrosting system to a different mode while freezing the operating frequency of the non-defrosting system to isolate the frequency increase interference caused by water temperature fluctuations.

[0110] In step S4, during the defrosting of the first system, the second system maintains the freezing frequency and continuously monitors its own operating parameters.

[0111] In this embodiment, step S4, during the defrosting of the first system, the second system maintains the freezing frequency and continuously monitors its own operating parameters, may specifically include the following steps:

[0112] S41, during the second system frequency lockout, continuously monitors the exhaust temperature.

[0113] Low pressure and pipe temperature When the monitored value exceeds the protection threshold, the frequency lock is temporarily released to perform the protection action. If the first system has not finished defrosting after the parameters return to normal, the lock is re-locked.

[0114] Step S41 involves continuous monitoring and protection of the pipe temperature. During the second system frequency lockout period, the main controller continues to monitor its key operating parameters, including the exhaust temperature. Low pressure

[0115] and pipe temperature Once detected Exceeding the protection threshold of 110℃, or

[0116] If the pressure drops below the low-pressure protection value of 0.2 MPa, the system will immediately initiate protective unlocking, temporarily releasing the frequency lock, appropriately reducing the frequency, or taking other protective measures. Once the parameters return to normal, if the first system has not yet finished defrosting, it will lock again. This is a safety fallback logic, with higher priority than the defrosting logic.

[0117] S42 utilizes the thermal inertia of the water in the water system to buffer the drop in outlet water temperature caused by the cooling of the first system.

[0118] Step S42 performs thermal inertia buffering of the water system. Utilizing the thermal inertia of the large volume of water in the water system, the drop in outlet water temperature caused by the cooling of the first system is buffered. Frequency locking of the second system means that its heating output remains constant. The corresponding heating capacity. The cooling capacity of the first system absorbs heat from the water. The final change in outlet water temperature is the result of the combined effect of both. Due to the large heat capacity of water (typically a tank capacity of 200-500L), the temperature change is relatively slow (e.g., This buys time for the first system to complete defrosting. This stage requires no active control and relies on the passive coordination of the system's physical characteristics.

[0119] S43, monitor the temperature of the evaporator coil in the first system. The upward trend, when Rise to defrost termination temperature If the defrosting process continues for more than the preset time, the defrosting is considered complete.

[0120] Step S43 involves precise determination of the defrosting endpoint. During the first system defrosting, the temperature of its evaporator (now condenser) coil is monitored. The upward trend. When Rise to defrost termination temperature

[0121] If the frost layer melts completely, and this continues for more than 30 seconds, it is determined that the frost layer has melted completely. Based on ambient temperature lock-in value

[0122] Correction:

[0123] when hour, ;

[0124] when hour, .

[0125] This method of judgment is more accurate and energy-efficient than simply using timed defrosting.

[0126] The purpose of step S4 is to maintain the stable operation of the second system and the hydraulic balance of the entire system during the defrosting of the first system, and to prevent new control disturbances.

[0127] Step S5: After the first system switches back to heating mode, the frequency lock state and ambient temperature lock state of the second system are maintained for a preset time.

[0128] In this embodiment, step S5, after the first system switches back to heating mode, maintaining the frequency lock state and ambient temperature lock state of the second system for a preset time may specifically include the following steps:

[0129] S51, the first system compressor reduces its frequency to a safe commutation frequency.

[0130] The four-way valve reverses, switching the first system back to heating mode.

[0131] Step S51 initiates the first system commutation to exit defrosting. The first system first reduces its frequency to a safe commutation frequency. The downward slope remains unchanged. Then, the power supply to the four-way valve coil is cut off, switching the first system back to heating mode. After the reversal, the evaporator becomes a heat-absorbing component again, and the first system begins to absorb heat from the air. Differential pressure monitoring is also used to ensure a smooth reversal process.

[0132] S52, after the first system commutation is completed, the frequency lock state of the second system is maintained for a preset holding time. .

[0133] Step S52 involves maintaining the frequency lock-in between the two systems. During the initial phase after the first system completes its switching and begins frequency ramp-up for heating, the frequency lock-in state of the second system remains unchanged. The PID control of the second system continues to be disabled. This is because the first system has just switched back from cooling to heating, and the system water temperature is at the inflection point of transitioning from decreasing to increasing, resulting in significant fluctuations. If the second system is unlocked immediately, its PID controller may rapidly ramp up its frequency due to detecting a low temperature, competing for heat with the recovering first system and causing system oscillations. Therefore, a hold-in time is set. minute.

[0134] S53, start the timer. Within the preset delay time, the defrosting logic will still use the locked ambient temperature value. Once the ambient temperature returns to its true level, the lock will be released, and the real-time filter value will resume operation. .

[0135] Step S53 involves a delayed unlocking of the ambient temperature reading. After the first system defrost cycle, the ambient temperature sensor does not immediately use the real-time value. A 3-minute timer is started. During these 3 minutes, the defrost logic continues to use the previously locked ambient temperature value. This allows sufficient time for the locally heated environment caused by defrosting to dissipate and recover. Once the hot air has dissipated and the ambient temperature returns to its true level, the lockout can be lifted. After the timer expires, the real-time filter value will resume operation. .

[0136] The purpose of step S5 is to safely switch the defrosting system back to heating mode and to unlock the non-defrosting system and environmental parameters in stages and in an orderly manner to avoid shocks and vibrations during the recovery process.

[0137] Step S6: Release the frequency lock and ambient temperature lock in stages, and start the defrost shield timer for the system that has completed defrosting.

[0138] In this embodiment, step S6, which involves releasing the frequency lock and ambient temperature lock in stages and starting the defrost shield timer for the system after defrosting, may specifically include the following steps:

[0139] S61, after the first system exits defrost and has been in hold time Then, unlock the second system frequency and switch to the currently locked frequency. As the initial value for PID control, the PID automatic control function is gradually restored with a gradual rate limit.

[0140] Step S61 performs a stepped unlocking of the inter-system frequency. The frequency lock of the second system is officially released only after the first system exits defrosting and has been held for 5 minutes. During unlocking, frequency control is not immediately returned to the PID controller; instead, a soft-start transition period is first established. The currently locked frequency is then... As the initial value for PID control, then with The rate limit is applied, gradually restoring the automatic adjustment function of the PID controller. This avoids system shocks caused by sudden frequency changes.

[0141] S62, at the moment the first system exits defrost, starts the defrost shield timer, and sets the timer duration.

[0142] It forcibly prevents the first system from re-entering defrost before the timer reaches zero.

[0143] Step S62 performs system defrost interval timing. The moment the first system exits defrost, the main control program immediately starts a defrost shield timer, with a timing duration as follows: Minutes. Before the timer resets to zero, even if the pipe temperature and other parameters of the first system meet the defrosting conditions again, the AND gate in the control logic will be disabled due to the existence of this timer, forcibly preventing the first system from re-entering the defrosting process. This allows sufficient time for the condensate on the evaporator surface to drain and re-frost.

[0144] S63 uses a status flag and an independent shield timer to build an interlocking mechanism, ensuring that at most one system is in defrost state at any given time, and that each system has a mandatory rest period after defrosting.

[0145] Step S63 involves alternating interlocking and state reset. If the second system also requires defrosting while the first system's shield timer is running, the second system will enter the defrosting process. At this time, the first system, as a non-defrosting system, will have its frequency locked and repeat the logic of steps S3 to S6. When the second system finishes defrosting, it will also start its own 20-minute shield timer. An interlocking mechanism is constructed using status flags (Flag_A, Flag_B) and two independent shield timers. This ensures that at any given time, at most one system is in defrosting mode, and each system has a mandatory rest period after defrosting.

[0146] The purpose of step S6 is to finally restore the unit's normal regulation function and establish a defrosting interlock mechanism between the two systems to prevent repeated or alternating defrosting in the short term.

[0147] Figure 2 This is a sequence diagram of the operation of the first and second systems in the heat pump dual-system defrosting control method of the present invention. Figure 2 As shown in the diagram, ① indicates that the compressor in the first system increases its frequency, the compressor in the second system increases its frequency, the ambient temperature fluctuates, and the reversing valve in both systems is de-energized. ② indicates that the first system enters defrosting, the compressor in the first system begins to reduce its frequency, the ambient temperature stabilizes ahead of schedule, and the reversing valve in the first system is energized. ③ indicates that the compressor in the first system increases its frequency to the defrosting frequency, and the reversing valve in the first system is energized. ④ indicates that after defrosting, the compressor in the first system reduces its frequency and then increases its frequency again, and the reversing valve in the first system reduces its frequency and is de-energized. ⑤ indicates that the ambient temperature resumes fluctuation. ⑥ indicates that the second system enters defrosting, the compressor in the second system begins to reduce its frequency, the ambient temperature stabilizes ahead of schedule, and the reversing valve in the second system is energized. ⑦ indicates that the compressor in the second system increases its frequency to the defrosting frequency, and the reversing valve in the second system is energized. ⑧ indicates that after defrosting, the compressor in the second system reduces its frequency and then increases its frequency again, and the reversing valve in the second system reduces its frequency and is de-energized. ⑨ indicates that the ambient temperature resumes fluctuation.

[0148] The beneficial effects of implementing this embodiment are:

[0149] (1) By locking the ambient temperature and freezing the frequency of different systems, the interference path of defrosting of one system on the frost criterion of another system is cut off, ensuring the authenticity and necessity of the defrosting action;

[0150] (2) By introducing a defrost interval timer, the system is forced to have sufficient rest and stable operation time after defrosting, avoiding frequent start-stop and pressurized reversing of the compressor, and significantly extending the service life of the compressor and the four-way reversing valve.

[0151] (3) By freezing the frequency of the different systems, the non-defrosting system can provide heat continuously and stably, making up for the heat loss caused by the defrosting system, controlling the water temperature fluctuation during the entire defrosting process within a very small range, and greatly improving the user's heating experience.

[0152] (4) By accurately judging the entry and exit of defrosting, the heat loss and energy waste caused by defrosting without frost are avoided, and the stable operating state keeps the unit at a high energy efficiency level.

[0153] (5) Through multi-level protection logic such as protective unlocking, pressure monitoring and parameter filtering algorithms, the control system can still maintain high stability and reliability when facing complex and ever-changing actual working conditions.

[0154] This invention can be used in a wide variety of general-purpose or special-purpose computer system environments or configurations. Examples include: personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, and distributed computing environments including any of the above systems or devices. This invention can be described in the general context of computer-executable instructions, such as program modules, that are executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform specific tasks or implement specific abstract data types. This invention can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0155] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing related hardware through computer-readable instructions. These computer-readable instructions can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods. The aforementioned storage medium can be a non-volatile storage medium such as a magnetic disk, optical disk, or read-only memory (ROM), or random access memory (RAM).

[0156] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0157] Example 2

[0158] This embodiment optimizes and adjusts the PID control parameters based on Embodiment 1.

[0159] The value is 1.2. The value is 0.3. The value is set to 0.1. Experiments show that under this set of parameters, the system response speed is moderate, the overshoot is controlled within 3%, and the steady-state error is less than 0.5℃.

[0160] Example 3

[0161] This embodiment specifies the defrosting termination temperature. The judgment logic is supplemented. Besides being based on pipe temperature...

[0162] In addition to the judgment, a maximum defrost time protection is also introduced. This protection is applied when the defrost operation time exceeds the maximum allowable time. At the minute, regardless of Has it been achieved? All of these will force the exit of defrosting mode to prevent defrosting from failing due to sensor malfunction or insufficient refrigerant.

[0163] Example 4

[0164] This embodiment addresses the data queue length of the moving average filtering algorithm. Perform variable parameter design. Dynamically adjust the parameters when the ambient temperature changes drastically (e.g., sudden changes in wind speed). Value. When a fluctuation of more than 3 consecutive sampled values ​​is detected. At that time, Increase the value from 10 to 20 to enhance the filtering effect; once the fluctuations stabilize, Reset to 10 to maintain response sensitivity.

[0165] Example 5

[0166] Further reference Figure 3 As a response to the above Figure 1 The present invention provides an embodiment of a heat pump dual-system defrosting control device, which is similar to the method shown. Figure 1 Corresponding to the method embodiments shown, this device can be specifically applied to various electronic devices.

[0167] like Figure 3As shown, the heat pump dual-system defrosting control device 70 in this embodiment includes: a baseline operation and frosting prediction module 71, a defrosting entry judgment and system isolation module 72, a defrosting switching and inter-system frequency freezing module 73, a cooperative operation and status maintenance module 74, a defrosting exit and system recovery preparation module 75, and a full parameter recovery and interlock protection module 76. Wherein:

[0168] The baseline operation and frost prediction module 71 is used to collect real-time operating parameters and establish a heating operation baseline.

[0169] The defrost entry judgment and system isolation module 72 is used to lock the real-time ambient temperature value and send a frequency lock signal to the second system when the first system meets the comprehensive defrost conditions.

[0170] The defrosting switching and inter-system frequency freezing module 73 is used for the first system to switch to defrosting mode by reducing the frequency, while the second system freezes the current operating frequency after receiving the frequency lock signal;

[0171] The collaborative operation and status maintenance module 74 is used to maintain the freezing frequency of the second system during the defrosting of the first system and to continuously monitor its own operating parameters.

[0172] The defrosting exit and system recovery preparation module 75 is used to maintain the frequency lock state and ambient temperature lock state of the second system for a preset time after the first system switches back to heating mode.

[0173] The full parameter recovery and interlock protection module 76 is used to release frequency lock and ambient temperature lock in stages, and to start the defrost shield timer for the system after defrosting.

[0174] The beneficial effects of implementing this embodiment are as follows: it ensures the authenticity and necessity of the defrosting action; it avoids frequent start-stop and pressurized reversing of the compressor, significantly extending the service life of the compressor and the four-way reversing valve; it compensates for the heat loss caused by the defrosting system, controlling the outlet water temperature fluctuation within a very small range throughout the defrosting process, greatly improving the user's heating experience; it avoids the heat loss and energy waste caused by frost-free defrosting, while the stable operating state keeps the unit at a high energy efficiency level; and it enables the control system to maintain high stability and reliability when facing complex and ever-changing actual operating conditions.

[0175] Example 6

[0176] To address the aforementioned technical problems, embodiments of the present invention also provide a computer device. Please refer to [link / reference needed]. Figure 4 , Figure 4 This is a basic structural block diagram of the computer device in this embodiment.

[0177] The aforementioned computer device 8 includes a memory 81, a processor 82, and a network interface 83 that are interconnected via a system bus. It should be noted that only the computer device 8 with components 81, 82, and 83 is shown in the figure; however, it should be understood that it is not required to implement all the shown components, and more or fewer components can be implemented alternatively. Those skilled in the art will understand that the computer device described herein is a device capable of automatically performing numerical calculations and / or information processing according to pre-set or stored instructions, and its hardware includes, but is not limited to, microprocessors, application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), digital signal processors (DSPs), embedded devices, etc.

[0178] The aforementioned computer devices can be desktop computers, laptops, handheld computers, and cloud servers, among other computing devices. These devices can facilitate human-computer interaction with users through keyboards, mice, remote controls, touchpads, or voice-activated devices.

[0179] The aforementioned memory 81 includes at least one type of readable storage medium, including flash memory, hard disk, multimedia card, card-type memory (e.g., SD or DX memory), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, magnetic disk, optical disk, etc. In some embodiments, the aforementioned memory 81 may be an internal storage unit of the aforementioned computer device 8, such as the hard disk or memory of the computer device 8. In other embodiments, the aforementioned memory 81 may also be an external storage device of the aforementioned computer device 8, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc., equipped on the computer device 8. Of course, the aforementioned memory 81 may also include both the internal storage unit and its external storage device of the aforementioned computer device 8. In this embodiment, the aforementioned memory 81 is typically used to store the operating system and various application software installed on the aforementioned computer device 8, such as computer-readable instructions for a heat pump dual-system defrosting control method. In addition, the aforementioned memory 81 can also be used to temporarily store various types of data that have been output or will be output.

[0180] In some embodiments, the processor 82 described above may be a central processing unit (CPU), a controller, a microcontroller, a microprocessor, or other data processing chip. The processor 82 is typically used to control the overall operation of the computer device 8. In this embodiment, the processor 82 is used to execute computer-readable instructions stored in the memory 81 or to process data, such as executing computer-readable instructions for the heat pump dual-system defrosting control method described above.

[0181] The network interface 83 may include a wireless network interface or a wired network interface, which is typically used to establish a communication connection between the computer device 8 and other electronic devices.

[0182] The beneficial effects of implementing this embodiment are as follows: it ensures the authenticity and necessity of the defrosting action; it avoids frequent start-stop and pressurized reversing of the compressor, significantly extending the service life of the compressor and the four-way reversing valve; it compensates for the heat loss caused by the defrosting system, controlling the outlet water temperature fluctuation within a very small range throughout the defrosting process, greatly improving the user's heating experience; it avoids the heat loss and energy waste caused by frost-free defrosting, while the stable operating state keeps the unit at a high energy efficiency level; and it enables the control system to maintain high stability and reliability when facing complex and ever-changing actual operating conditions.

[0183] Example 7

[0184] The present invention also provides another embodiment, namely, a computer-readable storage medium storing computer-readable instructions that can be executed by at least one processor to cause the at least one processor to perform the steps of the heat pump dual-system defrosting control method described above.

[0185] The beneficial effects of implementing this embodiment are as follows: it ensures the authenticity and necessity of the defrosting action; it avoids frequent start-stop and pressurized reversing of the compressor, significantly extending the service life of the compressor and the four-way reversing valve; it compensates for the heat loss caused by the defrosting system, controlling the outlet water temperature fluctuation within a very small range throughout the defrosting process, greatly improving the user's heating experience; it avoids the heat loss and energy waste caused by frost-free defrosting, while the stable operating state keeps the unit at a high energy efficiency level; and it enables the control system to maintain high stability and reliability when facing complex and ever-changing actual operating conditions.

[0186] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods of the various embodiments of the present invention.

[0187] Obviously, the embodiments described above are merely some embodiments of the present invention, not all embodiments. The accompanying drawings show preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this invention.

Claims

1. A defrosting control method for a dual-system heat pump, characterized in that, Includes the following steps: Collect real-time operating parameters and establish a heating operation benchmark; When the first system meets the comprehensive defrosting conditions, it locks the real-time ambient temperature value and sends a frequency lock signal to the second system. The first system switches to defrost mode by reducing the frequency, while the second system freezes the current operating frequency after receiving the frequency lock signal; During the defrosting of the first system, the second system maintains the freezing frequency and continuously monitors its own operating parameters; After the first system switches back to heating mode, the second system maintains its frequency lock state and ambient temperature lock state for a preset time. The frequency lock and ambient temperature lock are unlocked in stages, and a defrost shield timer is started for the system that has completed defrosting.

2. The defrosting control method for a dual-system heat pump according to claim 1, characterized in that, The steps of collecting real-time operating parameters and establishing a heating operation benchmark specifically include: Real-time collection of water temperature and target temperature Calculate the temperature difference According to temperature difference The operating frequency of the two compressors is adjusted using a PID algorithm. The formula is: ,in: Compressor operating frequency (unit: Hz) Reference frequency (unit: Hz) The proportional gain determines the response speed. Integral coefficients, used to eliminate steady-state errors. Differential coefficients are used to suppress overshoot and fluctuations. Temperature difference :time; With preset period Continuously record the temperature of the first system pipe Second system pipe temperature Calculate the rate of temperature drop in the tube. ; Collect raw ambient temperature data The filtered ambient temperature was obtained using a moving average filtering algorithm. ,in: : Ambient temperature after filtering : Data queue length, : No. A sampled ambient temperature value.

3. The defrosting control method for a dual-system heat pump according to claim 1, characterized in that, The step of locking the real-time ambient temperature value and sending a frequency locking signal to the second system when the first system meets the comprehensive defrosting conditions specifically includes: For the first system to enter defrost mode, the following conditions must be met simultaneously: the cumulative running time of the compressor is greater than the minimum heating time. Pipe temperature Below the frosting temperature threshold Pipe temperature drop rate continuous The number of cycles exceeded the preset rate threshold; When the first system meets the defrosting conditions, the main control program marks the defrosting status flag for the first system, locks the power supply circuit of the four-way valve coil, and sends an interrupt signal to the second system. Record the filtered ambient temperature value at the moment the first system enters the defrost state. Write to the read-only register.

4. The defrosting control method for a dual-system heat pump according to claim 1, characterized in that, The steps of the first system switching to defrost mode by reducing its frequency, and the second system freezing its current operating frequency after receiving the frequency lock signal, specifically include: The first system compressor descends at a preset slope. Smoothly reduce frequency to the safe switching frequency of the reversing valve When the frequency drops to Then, the four-way valve reverses, switching the first system to a refrigeration cycle, and then the compressor rises at a preset incline. Increase to defrost-specific frequency As the first system begins to reduce its frequency, the main control program pauses the PID controller of the second system, forcibly locking the operating frequency of the second system to the current value. The inverter frequency setpoint is set to a constant. .

5. The defrosting control method for a dual-system heat pump according to claim 1, characterized in that, The steps of maintaining the freezing frequency and continuously monitoring its own operating parameters during the defrosting process of the first system specifically include: During the second system frequency lockout, exhaust temperature is continuously monitored. Low pressure and pipe temperature When the monitored value exceeds the protection threshold, the frequency lock is temporarily released to perform the protection action. If the first system has not finished defrosting after the parameters return to normal, the lock is re-locked. The thermal inertia of the water in the water system is used to buffer the drop in outlet water temperature caused by the cooling of the first system. Monitor the temperature of the evaporator coil in the first system. The upward trend, when Rise to defrost termination temperature If the defrosting process continues for more than the preset time, the defrosting is considered complete.

6. The defrosting control method for a dual-system heat pump according to claim 1, characterized in that, After the first system switches back to heating mode, the steps for maintaining the frequency lock state and ambient temperature lock state of the second system for a preset time specifically include: The first system compressor reduces its frequency to a safe commutation frequency. The four-way valve reverses, switching the first system back to heating mode; After the first system completes its commutation, the second system maintains its frequency lock state for a preset duration. ; Start the timer; within the preset delay time, the defrosting logic will still use the locked ambient temperature value. Once the ambient temperature returns to its true level, the lock will be released, and the real-time filter value will resume operation. .

7. The defrosting control method for a dual-system heat pump according to any one of claims 1 to 6, characterized in that, The steps of phased unlocking of frequency lock and ambient temperature lock, and starting the defrost shield timer for the system after defrosting, specifically include: The first system exits defrost and remains in place for a period of time. Then, unlock the second system frequency and switch to the currently locked frequency. As the initial value for PID regulation, the PID automatic regulation function is gradually restored with a gradual rate limit. At the moment the first system exits defrost, start the defrost shield timer and set the timer duration. The system forcibly prevents the first system from re-entering defrosting before the timer reaches zero. An interlocking mechanism is constructed using status flags and independent masking timers to ensure that at most one system is in defrost mode at any given time, and that each system has a mandatory rest period after defrosting.

8. A heat pump dual-system defrosting control device, characterized in that, include: The baseline operation and frosting prediction module is used to collect real-time operating parameters and establish a heating operation baseline; The defrosting entry judgment and system isolation module is used to lock the real-time ambient temperature value and send a frequency lock signal to the second system when the first system meets the comprehensive defrosting conditions. The defrosting switching and inter-system frequency freezing module is used for the first system to switch to defrosting mode by reducing its frequency, while the second system freezes its current operating frequency after receiving the frequency locking signal. The collaborative operation and status maintenance module is used to maintain the freezing frequency of the second system during the defrosting of the first system and to continuously monitor its own operating parameters. The defrost exit and system recovery preparation module is used to maintain the frequency lock state and ambient temperature lock state of the second system for a preset time after the first system switches back to heating mode. The full parameter recovery and interlock protection module is used to unlock the frequency lock and ambient temperature lock in stages, and to start the defrost shield timer for the system after defrosting.

9. A computer device, characterized in that, The device includes a memory and a processor, wherein the memory stores computer-readable instructions, and the processor executes the computer-readable instructions to implement the steps of the heat pump dual-system defrosting control method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-readable instructions, which, when executed by a processor, implement the steps of the heat pump dual-system defrosting control method as described in any one of claims 1 to 7.

Images