Heat pump system control method, device and equipment and storage medium

Abstract

The invention provides a heat pump system control method, device and equipment and a storage medium, and relates to the technical field of vehicles. The method comprises the steps that in the starting stage of the heat pump system, the initial rotating speed of a compressor and the target opening degree of a shutoff valve are determined, the compressor is controlled to be started at the initial rotating speed, the opening degree of the shutoff valve is adjusted to the target opening degree, the initial rotating speed and the target opening degree are maintained for a preset duration, and the initial rotating speed is lower than a preset rotating speed threshold value; the target opening and the initial rotating speed are correspondingly set; in the operation stage of the heat pump system, the opening upper limit of the shutoff valve is set, and the opening of the shutoff valve is controlled based on the opening upper limit. The liquid impact phenomenon of air suction can be avoided, and therefore it can be ensured that when the heat pump system is started in the low-temperature environment, the compressor cannot be damaged due to liquid impact of the compressor; the shutoff valve can achieve gradient lowering or rising according to the upper limit of the opening degree, non-linear adjustment is achieved, therefore, the liquid impact phenomenon in the valve adjusting process can be avoided, and low-pressure shutoff is prevented.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and more specifically, to a heat pump system control method, apparatus, equipment, and storage medium. Background Technology

[0002] A heat pump system typically includes key components such as a compressor, condenser, heat exchanger, and expansion valve. These components together constitute the heat energy conversion cycle of the heat pump system. Through thermodynamic processes such as compression, condensation, expansion, and evaporation during the cycle, the heat pump system can effectively utilize low-temperature heat sources in the environment to provide heating and cooling services, thereby achieving the goals of efficient energy utilization and environmental protection.

[0003] Currently, when the ambient temperature is low, the refrigerant temperature at the heat exchanger inlet is also low. In order to avoid the compressor's low-pressure protection, the refrigerant flow rate is usually increased. However, this can cause liquid slugging during compressor startup and operation, which can lead to compressor damage. Summary of the Invention

[0004] The problem solved by this invention is how to avoid compressor liquid slugging and prevent low-pressure shut-off.

[0005] To address the above problems, the present invention provides a heat pump system control method, apparatus, equipment, and storage medium.

[0006] In a first aspect, the present invention provides a heat pump system control method, applied to a heat pump system, the heat pump system including a compressor, a condenser, a heat exchanger, and a shut-off valve, wherein the compressor, the condenser, and the heat exchanger are sequentially connected to form a circuit, and the shut-off valve is located between the condenser and the heat exchanger; the heat pump system control method includes:

[0007] During the heat pump system startup phase, the initial speed of the compressor and the target opening of the throttle valve are determined, the compressor is controlled to start at the initial speed, the opening of the throttle valve is adjusted to the target opening, and the initial speed and the target opening are maintained for a preset duration. The initial speed is lower than a preset speed threshold, and the target opening is set corresponding to the initial speed.

[0008] During the operation of the heat pump system, the upper limit of the opening of the shut-off valve is set, and the opening of the shut-off valve is controlled based on the upper limit of the opening.

[0009] Optionally, determining the initial speed of the compressor and the target opening degree of the throttle valve includes:

[0010] According to a first preset relationship, the initial rotational speed and the target opening degree are determined based on the inlet refrigerant temperature of the heat exchanger, wherein the first preset relationship includes the inlet refrigerant temperature and the initial rotational speed and the target opening degree corresponding to the inlet refrigerant temperature.

[0011] Optionally, maintaining the initial rotational speed and the target opening for a preset duration includes:

[0012] Maintain the initial rotational speed and the target opening for a first preset duration;

[0013] Determine whether the inlet refrigerant temperature of the heat exchanger is greater than or equal to the low-pressure saturation temperature;

[0014] If the inlet refrigerant temperature of the heat exchanger is greater than or equal to the low-pressure saturation temperature, the system enters the heat pump system operation phase; if the inlet refrigerant temperature of the heat exchanger is less than the low-pressure saturation temperature, the initial rotation speed and the target opening are maintained for a second preset duration until the inlet refrigerant temperature of the heat exchanger is greater than or equal to the low-pressure saturation temperature, at which point the maintenance of the initial rotation speed and the target opening is stopped.

[0015] Optionally, setting the upper limit of the opening of the throttling valve includes:

[0016] According to the second preset relationship, the upper limit of the opening of the throttling valve is determined based on the inlet refrigerant temperature of the heat exchanger and the speed of the compressor. The second preset relationship includes the upper limit of the opening of the throttling valve and the speed of the compressor and the temperature difference corresponding to the upper limit of the opening of the throttling valve. The temperature difference is determined by the inlet refrigerant temperature of the heat exchanger and the low-pressure saturation temperature.

[0017] Optionally, setting the upper limit of the opening of the throttling valve further includes:

[0018] When the load change rate of the heat pump system is greater than the preset change rate, the current speed of the compressor is detected, and the upper limit of the opening degree is adjusted according to the current speed.

[0019] Optionally, the heat pump system control method further includes:

[0020] During the operation of the heat pump system, it is determined whether the low pressure of the compressor is higher than the preset pressure. If the low pressure is higher than the preset pressure, the speed of the compressor is increased, and the operation of the throttle valve is controlled according to the upper limit of the opening. If the low pressure is less than or equal to the preset pressure, the speed of the compressor is reduced.

[0021] Optionally, the heat pump system control method further includes:

[0022] During the operation of the heat pump system, the opening of the shut-off valve is adjusted according to the detected outlet superheat of the heat exchanger, and the opening of the shut-off valve is less than or equal to the upper limit of the opening.

[0023] Secondly, the present invention provides a heat pump system control device applied to a heat pump system, the heat pump system including a compressor, a condenser, a heat exchanger, and a shut-off valve, the compressor, the condenser, and the heat exchanger being sequentially connected to form a circuit, the shut-off valve being located between the condenser and the heat exchanger, and the heat pump system control device comprising:

[0024] The start-up control module is used to determine the initial speed of the compressor and the target opening degree of the throttling valve during the start-up phase of the heat pump system, control the compressor to start at the initial speed, adjust the opening degree of the throttling valve to the target opening degree, and maintain the initial speed and the target opening degree for a preset duration, wherein the initial speed is lower than a preset speed threshold, and the target opening degree is set corresponding to the initial speed.

[0025] The operation control module is used to set the upper limit of the opening degree of the throttling valve during the operation of the heat pump system, and control the opening degree of the throttling valve based on the upper limit of the opening degree.

[0026] Thirdly, the present invention provides an electronic device, including a memory and a processor;

[0027] The memory is used to store computer programs;

[0028] The processor is configured to implement the above-described heat pump system control method when executing the computer program.

[0029] Fourthly, the present invention provides a computer storage medium storing a computer program, which, when executed by a processor, implements the above-mentioned heat pump system control method.

[0030] This invention sets the compressor to start at an initial speed below a preset threshold during the heat pump system startup phase, simultaneously adjusting the opening of the corresponding throttling valve. At this time, the compressor is operating at a low speed, the throttling valve opening is relatively small, and the refrigerant flow is low, allowing for sufficient heat absorption and vaporization. This ensures that liquid slugging does not occur during suction, preventing compressor damage caused by liquid slugging during low-temperature startup. Furthermore, by setting an upper limit for the throttling valve opening during the heat pump system operation phase, the valve can be gradually increased or decreased according to this upper limit, rather than adjusting linearly. For example, if the compressor speed is 4500 rpm and the upper limit is 35%, and the compressor speed suddenly increases to 3000 rpm, the upper limit will immediately change from 35% to 30%, rather than gradually decreasing linearly. This avoids liquid slugging during valve adjustment and prevents overheating due to lack of suction. Additionally, by maintaining the initial speed and target opening for a preset duration, the compressor speed is prevented from immediately increasing, thus preventing low-pressure shut-off issues. Attached Figure Description

[0031] Figure 1 This is a schematic flowchart of the heat pump system control method according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the composition of a heat pump system according to an embodiment of the present invention;

[0033] Figure 3 This is a system block diagram of the heat pump system control device according to an embodiment of the present invention;

[0034] Figure 4 This is a system block diagram of an electronic device according to an embodiment of the present invention;

[0035] Figure 5 This is a system block diagram of the storage medium according to an embodiment of the present invention. Detailed Implementation

[0036] In the existing technology, when the ambient temperature is low, the refrigerant temperature at the heat exchanger inlet is also low. At this time, the high and low pressures of the heat pump system are both in the range of [1.2 bar.A, 2.5 bar.A]. When the compressor starts, the valve cannot be closed quickly. Otherwise, the compressor will be under low pressure protection because the system low pressure is lower than 1 bar.A. However, maintaining a large opening will also cause liquid slugging in the compressor, which will damage the compressor. Here, bar.A represents the absolute pressure.

[0037] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0038] like Figure 1As shown, this embodiment of the invention provides a heat pump system control method applied to a heat pump system. The heat pump system includes a compressor, a condenser, a heat exchanger, and a shut-off valve. The compressor, the condenser, and the heat exchanger are sequentially connected to form a circuit. The shut-off valve is located between the condenser and the heat exchanger. The heat pump system control method includes:

[0039] During the heat pump system startup phase, the initial speed of the compressor and the target opening of the throttling valve are determined, the compressor is controlled to start at the initial speed, the opening of the throttling valve is adjusted to the target opening, and the initial speed and the target opening are maintained for a preset duration. The initial speed is lower than a preset speed threshold, and the target opening is set corresponding to the initial speed.

[0040] Specifically, during the heat pump system startup phase, the initial compressor speed and the target opening of the throttle valve are first determined. The initial speed is lower than the preset speed threshold, and the target opening is set accordingly. The compressor is controlled to start at the initial speed, and the opening of the throttle valve is adjusted to the target opening, that is, the compressor is controlled to be in a low-speed state, and the opening of the throttle valve is also relatively small. This initial speed and target opening are maintained for a preset duration. At this time, the opening of the throttle valve is relatively small, the refrigerant flow of the heat pump system is small, and it can fully absorb heat and vaporize, so that liquid slugging will not occur during gas intake. This ensures that the heat pump system will not be damaged due to liquid slugging when starting in a low-temperature environment.

[0041] Combination Figure 2As shown, the heat pump system can be applied to vehicles. The heat pump system in this embodiment includes a compressor, a condenser (e.g., a water-cooled condenser), a heat exchanger (e.g., a plate heat exchanger), a heater core, an expansion valve EXV1 (e.g., an electronic expansion valve), an expansion valve EXV2 (i.e., a shut-off valve), a blower, a temperature and pressure sensor, a three-way valve, a battery, and a motor. One end of the compressor is connected to the condenser, and the other end is connected to the outlet collection end of the heat exchanger and evaporator. The port in the condenser for coolant (e.g., a mixture of ethylene glycol and water) input can be connected to the output port of the heater core, and the port in the condenser for coolant output can be connected to the input port of the heater core. The heater core is located inside the air conditioning unit HVAC (Heating, Ventilation, Air-conditioning and Cooling) and is responsible for providing cold / hot air to the passenger compartment. The condenser's refrigerant (e.g., low-pressure refrigerant) output port connects to two branches. One branch houses an expansion valve EXV1, whose outlet is connected to the evaporator. The other branch houses an expansion valve EXV2, whose outlet is connected to a heat exchanger. A temperature and pressure sensor is installed at the heat exchanger's outlet, serving as the basis for setting the opening degrees of expansion valves EXV1 and EXV2. The coolant side of the heat exchanger is connected to both the motor and battery. A three-way valve separates the motor and battery circuits, allowing for heat recovery from either the motor circuit alone or in series with the battery.

[0042] The compressor is used to compress low-pressure, low-temperature vapor condenser into high-pressure, high-temperature gas; the condenser lowers the temperature of the condensed gas by contacting it with a coolant (such as cooling water or other cooling medium), thereby turning it into a liquid state; the heat exchanger is used to transfer heat in the air conditioning system; and the expansion valve controls the flow of refrigerant (such as low-pressure refrigerant) to the evaporator and ensures that the appropriate amount of refrigerant enters the evaporator.

[0043] Some existing technologies employ the following approach: when the temperature drops, the valve core closes, obstructing refrigerant flow; when the outlet temperature rises, the valve body opens, increasing refrigerant flow. However, this approach is often unsuitable for low-temperature heat pump operation. During startup, the low temperature leads to a small valve opening, easily causing system shutdown due to excessively low pressure. Since the compressor speed should not be too high during low-temperature startup of a heat pump system, excessive speed can easily cause the low pressure to drop below 1 bar·A after startup, thus causing the compressor to shut down. This embodiment sets the compressor to start at an initial speed lower than a preset speed threshold, and simultaneously adjusts the opening of the corresponding throttling valve (too small an opening will also cause excessively low pressure and compressor shutdown), ensuring that compressor shutdown will not occur.

[0044] During the operation of the heat pump system, the upper limit of the opening of the shut-off valve is set, and the opening of the shut-off valve is controlled based on the upper limit of the opening.

[0045] Specifically, during the operation of the heat pump system, by setting the upper limit of the opening of the throttle valve and controlling the opening of the throttle valve based on the upper limit, the throttle valve can be gradually reduced or increased according to the upper limit, rather than adjusted linearly. This can avoid liquid slugging during valve adjustment and prevent overheating due to lack of suction (for example, when the load changes, the electronic expansion valve may not be able to close and adjust in time, resulting in the compressor not having suction for a long time and overheating, which can lead to liquid slugging, compressor damage, or system noise).

[0046] This embodiment ensures that the compressor starts at an initial speed lower than a preset speed threshold during the heat pump system startup phase, while simultaneously adjusting the opening of the corresponding throttle valve. This prevents liquid slugging during suction, thus protecting the compressor from damage caused by liquid slugging during startup in low-temperature environments. Furthermore, by setting an upper limit for the throttle valve opening during system operation, the valve can be gradually lowered or raised according to this limit, rather than adjusted linearly. This avoids liquid slugging during valve adjustment and prevents overheating without suction (which requires suction overheating to maintain the required level of superheat). Additionally, by maintaining the initial speed and target opening for a preset duration, the compressor speed is prevented from immediately increasing, thus preventing low-pressure shut-off issues.

[0047] Optionally, determining the initial speed of the compressor and the target opening degree of the throttle valve includes:

[0048] According to a first preset relationship, the initial rotational speed and the target opening degree are determined based on the inlet refrigerant temperature of the heat exchanger, wherein the first preset relationship includes the inlet refrigerant temperature and the initial rotational speed and the target opening degree corresponding to the inlet refrigerant temperature.

[0049] Specifically, the first presupposed relationship is represented as follows:

[0050] Inlet water temperature (°C) -18 -15 -10 -5 0 5 10 Initial rotational speed (rpm) 1600 1600 1600 1500 1400 1300 1200 Target opening of the throttle valve 32％ 30％ 26％ 22％ 19％ 15％ 15％

[0051] According to the table above, the corresponding initial rotational speed and the corresponding target opening of the shut-off valve can be determined based on the inlet refrigerant temperature (e.g., inlet water temperature) of the heat exchanger.

[0052] Optionally, maintaining the initial rotational speed and the target opening for a preset duration includes:

[0053] The initial rotational speed and the target opening degree are maintained for a first preset duration.

[0054] Specifically, during the startup phase of the heat pump system, the initial speed and the target opening of the throttle valve are maintained for a first preset duration (e.g., 15 seconds). The maintenance time of at least 15 seconds can ensure that the compressor will not immediately increase its speed, thereby ensuring that there will be no low-pressure cut-off problem.

[0055] Determine whether the inlet refrigerant temperature of the heat exchanger is greater than or equal to the low-pressure saturation temperature; if the inlet refrigerant temperature of the heat exchanger is greater than or equal to the low-pressure saturation temperature, then enter the heat pump system operation phase; if the inlet refrigerant temperature of the heat exchanger is less than the low-pressure saturation temperature, then maintain the initial rotation speed and the target opening for a second preset time until the inlet refrigerant temperature of the heat exchanger is greater than or equal to the low-pressure saturation temperature, then stop maintaining the initial rotation speed and the target opening.

[0056] Specifically, the compressor's initial speed and the target opening of the throttle valve are maintained for a first preset duration. Then, the difference between the inlet refrigerant temperature and the low-pressure saturation temperature of the heat exchanger is determined. If the inlet refrigerant temperature of the heat exchanger is greater than or equal to the low-pressure saturation temperature, the system enters the heat pump system operation phase (e.g., the compressor speed control range). If the inlet refrigerant temperature of the heat exchanger is less than the low-pressure saturation temperature, the initial speed and the target opening are maintained for a second preset duration. Then, the difference between the inlet refrigerant temperature and the low-pressure saturation temperature of the heat exchanger is determined again until the inlet refrigerant temperature of the heat exchanger is greater than or equal to the low-pressure saturation temperature. At this point, the initial speed and the target opening are stopped, thus ensuring the suction superheat.

[0057] For example, taking a first preset duration of 15 seconds, after maintaining the initial compressor speed and the target opening of the throttle valve for 15 seconds, the difference between the inlet refrigerant temperature and the low-pressure saturation temperature of the heat exchanger is determined. If the inlet refrigerant temperature is lower than the low-pressure saturation temperature, the initial speed and target opening are maintained for a second preset duration (e.g., 15 seconds). The difference between the inlet refrigerant temperature and the low-pressure saturation temperature is determined again. If the inlet refrigerant temperature is still lower than the low-pressure saturation temperature, the initial speed and target opening are maintained for a third preset duration. For example, 15s), and so on (for example, continue to maintain the initial speed and target opening for a fourth preset time, a fifth preset time, etc.), until the inlet refrigerant temperature of the heat exchanger is greater than or equal to the low-pressure saturation temperature, at which point the maintenance of the initial speed and target opening is stopped; wherein, the second preset time and the third preset time, etc., can be the same as the first preset time, or can be increased or decreased, for example, the first preset time, the second preset time and the third preset time, etc. are 15s, 14s, 13s... or 15s, 16s, 17s... respectively.

[0058] Optionally, setting the upper limit of the opening of the throttling valve includes:

[0059] According to the second preset relationship, the upper limit of the opening of the throttling valve is determined based on the inlet refrigerant temperature of the heat exchanger and the speed of the compressor. The second preset relationship includes the upper limit of the opening of the throttling valve and the speed of the compressor and the temperature difference corresponding to the upper limit of the opening of the throttling valve. The temperature difference is determined by the inlet refrigerant temperature of the heat exchanger and the low-pressure saturation temperature.

[0060] Specifically, the second presupposed relationship is represented as follows:

[0061]

[0062] According to the table above, the upper limit of the throttling valve opening can be determined based on the inlet refrigerant temperature of the heat exchanger and the compressor speed. The temperature difference is obtained by subtracting the low-pressure saturation temperature from the inlet refrigerant temperature of the heat exchanger. For example, during the compressor speed control range, both high and low pressures change significantly. In this case, the throttling valve opening follows the corresponding upper limit. If the speed is 1000 rpm and the temperature difference is less than -3℃, it indicates that the heat exchanger is not absorbing heat, and the maximum opening of the throttling valve should not exceed 12%. Adjusting the throttling valve opening below 12% ensures that the heat exchanger outlet superheat meets the target.

[0063] For example, if the compressor speed was 4500 rpm and the opening limit was 35% at the previous moment, and the compressor speed was suddenly adjusted to 3000 rpm at the next moment, the opening limit will immediately change from 35% to 30%, instead of slowly and linearly decreasing from 35% to 30%.

[0064] The aforementioned upper limit of opening can be finely adjusted or modified, and the scope of protection is not limited to the upper limits of opening mentioned in this embodiment.

[0065] Optionally, setting the upper limit of the opening of the throttling valve further includes:

[0066] When the load change rate of the heat pump system is greater than the preset change rate, the current speed of the compressor is detected, and the upper limit of the opening degree is adjusted according to the current speed.

[0067] Specifically, when the load on the heat pump system changes rapidly (e.g., when the airflow suddenly decreases, or when switching from battery + cabin heating to cabin heating only), it is necessary to detect the current speed of the compressor and adjust the upper limit of the opening based on the current speed. Taking the sudden decrease in airflow as an example, the compressor speed needs to drop rapidly. The electronic expansion valve directly selects the upper limit of the corresponding throttle valve opening. During the entire operation, this opening is only set to the upper limit. Within this range, the electronic expansion valve can still adjust autonomously within a small range to ensure that the superheated suction air reaches the control target, thereby avoiding suction liquid slugging in the compressor.

[0068] Optionally, the heat pump system control method further includes: during the operation of the heat pump system, determining whether the low pressure of the compressor is higher than the preset pressure; if the low pressure is higher than the preset pressure, increasing the speed of the compressor and controlling the operation state of the throttle valve according to the upper limit of the opening; if the low pressure is less than or equal to the preset pressure, decreasing the speed of the compressor.

[0069] Specifically, during the operation of the heat pump system, specifically within the compressor speed control range, the compressor's low pressure is compared with the preset pressure. If the low pressure is higher than the preset pressure (e.g., 1 bar.A), the compressor speed is increased, and the operation of the shut-off valve is controlled according to the upper limit of the opening. That is, the shut-off valve is controlled with the heat exchanger outlet superheat as the target, and the upper limit of the opening is used as the upper limit value.

[0070] During the operation of a heat pump system, changes in indoor and outdoor temperatures, load demands, and other factors may necessitate adjusting the compressor speed to maintain stable system operation, improve energy efficiency, and ensure comfort. By controlling the compressor speed, the system can adjust its cooling or heating capacity according to demand, adapting to different operating conditions.

[0071] Optionally, the heat pump system control method further includes: during the operation phase of the heat pump system, adjusting the opening degree of the throttling valve according to the detected outlet superheat of the heat exchanger, wherein the opening degree of the throttling valve is less than or equal to the upper limit of the opening degree.

[0072] Specifically, the outlet superheat of the heat exchanger detected by the temperature and pressure sensors is used as feedforward to adjust (increase / decrease) the opening of the throttle valve (not exceeding the upper limit of the opening) so that the detection value of the temperature and pressure sensors meets the target superheat.

[0073] The opening degree of the shut-off valve is inversely proportional to the outlet superheat of the heat exchanger.

[0074] like Figure 3 As shown, another embodiment of the present invention provides a heat pump system control device applied to a heat pump system. The heat pump system includes a compressor, a condenser, a heat exchanger, and a shut-off valve. The compressor, the condenser, and the heat exchanger are sequentially connected to form a circuit. The shut-off valve is located between the condenser and the heat exchanger. The heat pump system control device includes:

[0075] The start-up control module is used to determine the initial speed of the compressor and the target opening degree of the throttling valve during the start-up phase of the heat pump system, control the compressor to start at the initial speed, adjust the opening degree of the throttling valve to the target opening degree, and maintain the initial speed and the target opening degree for a preset duration, wherein the initial speed is lower than a preset speed threshold, and the target opening degree is set corresponding to the initial speed.

[0076] The operation control module is used to set the upper limit of the opening degree of the throttling valve during the operation of the heat pump system, and control the opening degree of the throttling valve based on the upper limit of the opening degree.

[0077] like Figure 4 As shown, another embodiment of the present invention provides an electronic device, including a memory 402 and a processor 401 (which can be interconnected via a bus 400);

[0078] The memory 402 is used to store computer programs;

[0079] The processor 401 is used to implement the above-mentioned heat pump system control method when executing the computer program.

[0080] like Figure 5 As shown, another embodiment of the present invention provides a computer storage medium storing a computer program, which, when executed by a processor, implements the above-described heat pump system control method.

[0081] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A control method for a heat pump system, characterized in that, The heat pump system is applied to a heat pump system, which includes a compressor, a condenser, a heat exchanger, and a shut-off valve. The compressor, the condenser, and the heat exchanger are connected in sequence to form a circuit. The shut-off valve is located between the condenser and the heat exchanger. The control method for the heat pump system includes: During the heat pump system startup phase, the initial speed of the compressor and the target opening of the throttle valve are determined, the compressor is controlled to start at the initial speed, the opening of the throttle valve is adjusted to the target opening, and the initial speed and the target opening are maintained for a preset duration. The initial speed is lower than a preset speed threshold, and the target opening is set corresponding to the initial speed. During the operation of the heat pump system, the upper limit of the opening of the shut-off valve is set, and the opening of the shut-off valve is controlled based on the upper limit of the opening.

2. The heat pump system control method according to claim 1, characterized in that, Determining the initial speed of the compressor and the target opening degree of the throttle valve includes: According to a first preset relationship, the initial rotational speed and the target opening degree are determined based on the inlet refrigerant temperature of the heat exchanger, wherein the first preset relationship includes the inlet refrigerant temperature and the initial rotational speed and the target opening degree corresponding to the inlet refrigerant temperature.

3. The heat pump system control method according to claim 2, characterized in that, The preset duration for maintaining the initial rotation speed and the target opening includes: Maintain the initial rotational speed and the target opening for a first preset duration; Determine whether the inlet refrigerant temperature of the heat exchanger is greater than or equal to the low-pressure saturation temperature; If the inlet refrigerant temperature of the heat exchanger is greater than or equal to the low-pressure saturation temperature, the system enters the heat pump system operation phase; if the inlet refrigerant temperature of the heat exchanger is less than the low-pressure saturation temperature, the initial rotation speed and the target opening are maintained for a second preset duration until the inlet refrigerant temperature of the heat exchanger is greater than or equal to the low-pressure saturation temperature, at which point the maintenance of the initial rotation speed and the target opening is stopped.

4. The heat pump system control method according to claim 3, characterized in that, Setting the upper limit of the opening of the throttle valve includes: According to the second preset relationship, the upper limit of the opening of the throttling valve is determined based on the inlet refrigerant temperature of the heat exchanger and the speed of the compressor. The second preset relationship includes the upper limit of the opening of the throttling valve and the speed of the compressor and the temperature difference corresponding to the upper limit of the opening of the throttling valve. The temperature difference is determined by the inlet refrigerant temperature of the heat exchanger and the low-pressure saturation temperature.

5. The heat pump system control method according to claim 4, characterized in that, Setting the upper limit of the opening of the throttling valve also includes: When the load change rate of the heat pump system is greater than the preset change rate, the current speed of the compressor is detected, and the upper limit of the opening degree is adjusted according to the current speed.

6. The heat pump system control method according to claim 1, characterized in that, Also includes: During the operation of the heat pump system, it is determined whether the low pressure of the compressor is higher than the preset pressure. If the low pressure is higher than the preset pressure, the speed of the compressor is increased, and the operation of the throttle valve is controlled according to the upper limit of the opening. If the low pressure is less than or equal to the preset pressure, the speed of the compressor is reduced.

7. The heat pump system control method according to any one of claims 1-6, characterized in that, Also includes: During the operation of the heat pump system, the opening of the shut-off valve is adjusted according to the detected outlet superheat of the heat exchanger, and the opening of the shut-off valve is less than or equal to the upper limit of the opening.

8. A heat pump system control device, characterized in that, This is applied to a heat pump system, which includes a compressor, a condenser, a heat exchanger, and a shut-off valve. The compressor, the condenser, and the heat exchanger are connected in sequence to form a circuit. The shut-off valve is located between the condenser and the heat exchanger. The heat pump system control device includes: The start-up control module is used to determine the initial speed of the compressor and the target opening degree of the throttling valve during the start-up phase of the heat pump system, control the compressor to start at the initial speed, adjust the opening degree of the throttling valve to the target opening degree, and maintain the initial speed and the target opening degree for a preset duration, wherein the initial speed is lower than a preset speed threshold, and the target opening degree is set corresponding to the initial speed. The operation control module is used to set the upper limit of the opening degree of the throttling valve during the operation of the heat pump system, and control the opening degree of the throttling valve based on the upper limit of the opening degree.

9. An electronic device, characterized in that, Including memory and processor; The memory is used to store computer programs; The processor is configured to implement the heat pump system control method as described in any one of claims 1-7 when executing the computer program.

10. A computer storage medium, characterized in that, The storage medium stores a computer program, which, when executed by a processor, implements the heat pump system control method as described in any one of claims 1-7.

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