Control methods for environmental control equipment, environmental control equipment, and storage media

Abstract

This invention discloses a control method for an environmental conditioning device, the environmental conditioning device itself, and a storage medium. The environmental conditioning device includes an air duct and a heat pump system. The heat pump system includes a compressor and a heat exchanger disposed within the air duct. The method includes: controlling the compressor to start and acquiring first temperature data on the inlet side of the heat exchanger and second temperature data on the return side of the compressor; when the first temperature data and the second temperature data reach a first preset condition indicating a risk of refrigerant shortage in the heat pump system, controlling the compressor to shut down. This invention aims to reduce the risk of compressor damage due to refrigerant shortage in environmental conditioning devices and improve the reliability of heat pump system operation.

Description

Technical Field

[0001] This invention relates to the field of environmental equipment technology, and more particularly to control methods, environmental conditioning equipment, and storage media for environmental conditioning equipment. Background Technology

[0002] Most environmental control equipment (such as air conditioners and dehumidifiers) are equipped with heat pump systems. These systems regulate air temperature and humidity through refrigerant circulation before delivering the air into the indoor environment.

[0003] However, the installation of environmental control equipment is easily affected by the skill level of the technicians, resulting in issues such as refrigerant evacuation, leakage at the flared ends of connecting pipes, and valves not opening properly. These issues can cause refrigerant shortage during the operation of the heat pump system, leading to compressor damage due to overheating and wear. Summary of the Invention

[0004] The main objective of this invention is to provide a control method, an environmental conditioning device, and a storage medium for an environmental conditioning device, aiming to reduce the risk of compressor damage due to refrigerant shortage in the environmental conditioning device and improve the reliability of the heat pump system.

[0005] To achieve the above objectives, the present invention provides a control method for an environmental conditioning device, the environmental conditioning device including an air duct and a heat pump system, the heat pump system including a compressor and a heat exchanger disposed in the air duct, and the control method for the environmental conditioning device including the following steps:

[0006] The compressor is controlled to start, and the first temperature data of the air inlet side of the heat exchanger and the second temperature data of the air return side of the compressor are acquired.

[0007] When the first temperature data and the second temperature data reach a first preset condition indicating a risk of refrigerant shortage in the heat pump system, the compressor is controlled to shut down.

[0008] Optionally, the first preset condition includes a first sub-condition or a second sub-condition, and the step of controlling the compressor to shut down when the first temperature data and the second temperature data reach the first preset condition that the heat pump system has a risk of refrigerant shortage includes:

[0009] When the first temperature data and the second temperature data reach the first sub-condition, the compressor is controlled to shut down; or,

[0010] When the first temperature data and the second temperature data reach the second sub-condition, the compressor is controlled to shut down;

[0011] The first sub-condition includes that the temperature difference between the air inlet side and the air return side is less than a preset temperature difference value, and the temperature change value between the air inlet side and the air return side is less than a preset temperature change value. The second sub-condition includes that the temperature difference between the air inlet side and the air return side is less than a preset temperature difference value, and the temperature change value of the air return side is greater than or equal to a preset temperature change value.

[0012] Optionally, after the step of acquiring the first temperature data on the inlet side of the heat exchanger and the second temperature data on the return side of the compressor, the method further includes:

[0013] When the compressor's operating time is less than a first preset time, determine whether the first temperature data and the second temperature data meet the first sub-condition;

[0014] When the compressor's operating time is greater than or equal to the second preset time, determine whether the first temperature data and the second temperature data meet the second sub-condition;

[0015] Wherein, the second preset duration is greater than or equal to the first preset duration.

[0016] Optionally, before the step of determining whether the first temperature data and the second temperature data meet the first sub-condition, the method further includes:

[0017] When the compressor's operating time is less than the third preset time, the first preset temperature difference change value is determined to be the preset temperature difference change value;

[0018] When the compressor's operating time is greater than or equal to the third preset time and less than the first preset time, the second preset temperature difference change value is determined to be the preset temperature difference change value.

[0019] Wherein, the first preset temperature difference change value is less than the second preset temperature difference change value.

[0020] Optionally, the second temperature data includes at least two first sub-temperatures detected within a first time period and at least two second sub-temperatures detected within a second time period. The compressor's operating time within the first time period is less than the second preset time period, and the compressor's operating time within the second time period is greater than or equal to the second preset time period. After the step of acquiring the first temperature data on the inlet side of the heat exchanger and the second temperature data on the return side of the compressor, the method further includes:

[0021] When the compressor's operating time is greater than or equal to the second preset time, the minimum temperature value among the at least two first sub-temperatures is determined, and the maximum temperature value among the at least two second sub-temperatures is determined.

[0022] The temperature change value is determined based on the difference between the maximum temperature value and the minimum temperature value.

[0023] Optionally, after the step of controlling the compressor to shut down when the first temperature data and the second temperature data reach a first preset condition indicating a risk of refrigerant shortage in the heat pump system, the method further includes:

[0024] The compressor shutdown duration, the third temperature data of the heat exchanger's inlet side during the start-up phase before the compressor shuts down, and the fourth temperature data of the compressor's return side during the start-up phase before the compressor shuts down are obtained.

[0025] When the shutdown duration is greater than or equal to the fourth preset duration, and / or when the third temperature data and the fourth temperature data meet the second preset condition that the heat pump system has no risk of refrigerant shortage, the compressor is controlled to start.

[0026] Optionally, the second preset condition includes the number of times the first sub-condition or the second sub-condition is satisfied during the start-up phase before the compressor is shut down being less than or equal to a preset threshold.

[0027] Optionally, after the steps of controlling the compressor to start and acquiring the first temperature data on the inlet side of the heat exchanger and the second temperature data on the return side of the compressor, the method further includes:

[0028] When the first temperature data and the second temperature data do not meet the first preset condition, return to the step of controlling the compressor to start and obtaining the first temperature data on the air inlet side of the heat exchanger and the second temperature data on the air return side of the compressor.

[0029] Furthermore, in order to achieve the above objectives, this application also proposes an environmental control device, which includes:

[0030] Air duct;

[0031] A heat pump system, comprising a compressor and a heat exchanger located within the air duct,

[0032] A control device, wherein the heat pump system is connected to the control device, the control device comprising: a memory, a processor, and a control program for an environmental conditioning device stored in the memory and executable on the processor, wherein the control program for the environmental conditioning device, when executed by the processor, implements the steps of the control method for the environmental conditioning device as described in any of the preceding claims.

[0033] In addition, to achieve the above objectives, this application also proposes a storage medium storing a control program for an environmental control device, wherein the control program for the environmental control device, when executed by a processor, implements the steps of the control method for the environmental control device as described in any of the preceding claims.

[0034] This invention proposes a control method for an environmental conditioning device equipped with a heat pump system. During compressor startup, the method monitors a first temperature data on the air inlet side of the heat exchanger and a second temperature data on the air return side of the compressor. When the first and second temperature data meet a first preset condition indicating a refrigerant shortage risk in the heat pump system, the compressor is shut down. The first temperature data accurately reflects the operating condition of the heat exchanger in the air duct during compressor startup, while the second temperature data accurately reflects the refrigerant return to the compressor after circulation and heat exchange. Combining the first and second temperature data accurately characterizes the refrigerant shortage risk in the heat pump system. By promptly shutting down the compressor when this risk exists, the method ensures that the compressor will not overheat or wear due to refrigerant shortage, reducing the risk of compressor damage due to refrigerant shortage in the environmental conditioning device and effectively improving the reliability of the heat pump system. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of an embodiment of the environmental control device of the present invention;

[0036] Figure 2 This is a schematic diagram of another embodiment of the environmental control device of the present invention;

[0037] Figure 3 This is a schematic diagram of the hardware structure involved in the operation of an embodiment of the environmental control device of the present invention;

[0038] Figure 4 This is a flowchart illustrating an embodiment of the control method for the environmental conditioning equipment of the present invention;

[0039] Figure 5 This is a schematic flowchart of another embodiment of the control method for the environmental conditioning equipment of the present invention;

[0040] Figure 6 This is a flowchart illustrating another embodiment of the control method for the environmental conditioning equipment of the present invention.

[0041] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0043] This invention provides an environmental control device. The environmental control device is used to regulate the indoor environment. In this embodiment, the environmental control device is a fresh air system. In other embodiments, the environmental control device may also be other types of devices used to regulate the indoor environment, such as dehumidifiers, air conditioners, etc.

[0044] In this embodiment of the invention, reference is made to Figure 1 , Figures 2 to 3 The environmental control equipment includes an air duct 01, a heat pump system 2, and a control device. The heat pump system 2 includes a compressor 21, a heat exchanger 22, and a throttling device 23, all connected via refrigerant piping. The heat pump system 2 is connected to the control device.

[0045] The heat exchanger 22 is located inside the air duct 01 and can exchange heat with the air flowing through the air duct 01. Specifically, the environmental control equipment may also include a fan 5 inside the air duct 01. Driven by the fan 5, air enters the air duct 01, exchanges heat with the heat exchanger 22, and is then sent into the indoor environment.

[0046] In this embodiment, the air inlet of the air duct 01 is connected to the outdoor environment, and fresh air from the outdoor environment can enter the air duct 01, exchange heat with the heat exchanger 22, and then be sent into the duct. In other embodiments, the air inlet of the air duct 01 may also be connected to the indoor environment or simultaneously to both the indoor and outdoor environments.

[0047] In this embodiment, the throttling device 23 is an electronic expansion valve. In other embodiments, the throttling device 23 may also be a capillary tube, valve core, or other throttling component.

[0048] The heat pump system 2 may have more than one heat exchanger 22, and the number of heat exchangers 22 installed in the air duct 01 may be more than one. The heat exchange states of different heat exchangers 22 in the air duct 01 may be the same (e.g., all are in the evaporation state or condensation state). The number of different heat exchangers 22 in the air duct 01 may also be different (e.g., some heat exchangers 22 are in the evaporation state, and other heat exchangers 22 are in the condensation state).

[0049] The heat pump system 2 can be a system with cooling function only or heating function only, or a system that allows switching between cooling and heating functions.

[0050] In this embodiment, the environmental control equipment can be divided into different operating modes according to different indoor environmental control needs, such as heating mode, cooling mode, dehumidification mode, humidification mode, and air supply mode. In heating mode, the compressor 21 in the heat pump system 2 is turned on. The refrigerant discharged from the compressor 21 circulates in the refrigerant pipeline and then returns to the compressor 21. When it flows through the heat exchanger 22 in the air duct 01, it releases heat into the air, raising the air temperature. The heated air is then sent into the room. In cooling mode, the compressor 21 in the heat pump system 2 is turned on. The refrigerant discharged from the compressor 21 circulates in the refrigerant pipeline and then returns to the compressor 21. When it flows through the heat exchanger 22 in the air duct 01, it releases cooling energy into the air, lowering the air temperature. The cooled air is then sent into the room. In dehumidification mode, compressor 21 in heat pump system 2 is turned on. The refrigerant discharged from compressor 21 circulates in the refrigerant pipeline and then flows back to compressor 21. All or part of the heat exchangers 22 in air duct 01 are in an evaporating state. Moisture in the air flowing through air duct 01 condenses on the evaporating heat exchangers 22, reducing the air humidity. After the humidity is reduced, the air is sent into the room. When some heat exchangers 22 are in a condensing state, they can heat the dehumidified air before sending it into the room, achieving reheat dehumidification. In humidification and air supply modes, compressor 21 of heat pump system 2 can be turned off.

[0051] Furthermore, in this embodiment, the environmental control device is a separate unit, specifically including an indoor unit and an outdoor unit. The air duct 01 is located in the indoor unit, and the compressor 21 of the heat pump system 2 is located in the outdoor unit. In other embodiments, the environmental control device may also be an integrated unit, and the heat pump system 2 may be installed entirely within the indoor environment.

[0052] Furthermore, in one embodiment, referring to Figure 2 The environmental control equipment includes more than one of the aforementioned heat pump systems 2, each of which is connected to a control device. More than one heat exchanger 22 corresponding to each heat pump system 2 is arranged sequentially along the airflow direction within the air duct 01. During operation, more than one heat pump system 2 can be activated simultaneously. The heat exchange status of the heat exchangers 22 of different heat pump systems 2 located within the air duct 01 can be the same or different based on the heat exchange requirements of the indoor environment corresponding to the current operating mode.

[0053] Furthermore, in this embodiment, referring to Figure 3The environmental control equipment may also include a first temperature sensor 3, which is connected to a control device. The first temperature sensor 3 is located on the air inlet side of the heat exchanger 22 to detect the temperature of the air inlet side of the heat exchanger 22. Specifically, in this embodiment, the first temperature sensor 3 is located at the air inlet of the air duct 01. Furthermore, when there is more than one heat pump system 2, there may be more than one first temperature sensor 3. Each heat pump system 2 heat exchanger 22 has a corresponding first temperature sensor 3 installed in the air inlet of the air duct 01, and each first temperature sensor 3 can be used to detect the temperature of the corresponding heat exchanger 22's air inlet side.

[0054] Furthermore, in this embodiment, referring to Figure 3 The environmental control equipment may also include a second temperature sensor 4, which is connected to the control device. The second temperature sensor 4 is located on the return gas side of the compressor 21 to detect the temperature on the return gas side of the compressor 21.

[0055] In this embodiment of the invention, reference is made to Figure 3 The control device for the environmental control equipment includes a processor 1001 (e.g., CPU), a memory 1002, a timer 1003, etc. The components in the control device are connected via a communication bus. The memory 1002 can be a high-speed RAM or a stable, non-volatile memory, such as a disk drive. Optionally, the memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0056] Those skilled in the art will understand that Figure 3 The device structure shown does not constitute a limitation on the device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0057] like Figure 3 As shown, the memory 1002, which serves as a storage medium, may include a control program for an environmental control device. Figure 3 In the device shown, the processor 1001 can be used to call the control program of the environmental control device stored in the memory 1002 and execute the relevant steps of the control method of the environmental control device in the following embodiments.

[0058] This invention also provides a control method for an environmental control device, which is applied to the aforementioned environmental control device.

[0059] Reference Figure 4 This application proposes an embodiment of a control method for an environmental conditioning device. In this embodiment, the control method for the environmental conditioning device includes:

[0060] Step S10: Control the compressor to start, and acquire the first temperature data of the air inlet side of the heat exchanger and the second temperature data of the air return side of the compressor;

[0061] The first temperature data includes one or more first temperature values ​​on the air inlet side of the heat exchanger. The first temperature value can be the temperature measured at the current moment or the temperature measured during the start-up process before the current moment.

[0062] The second temperature data includes one or more second temperature values ​​on the compressor return side. The second temperature value can be the temperature detected at the current moment or the temperature detected during the start-up process before the current moment.

[0063] The first temperature data and the second temperature data are both data detected by the first temperature sensor and the second temperature sensor during the compressor's start-up process. Specifically, during the compressor's start-up process, data detected by the first temperature sensor and the second temperature sensor can be acquired at set intervals, and the detected data can be partially or entirely used as the corresponding first temperature data and second temperature data.

[0064] In this embodiment, the first and second temperature data are acquired when the compressor is on and the heat exchanger is in an evaporation state. In other embodiments, the first and second temperature data can also be acquired when the compressor is on and the heat exchanger is in a condensation state.

[0065] Step S20: When the first temperature data and the second temperature data reach the first preset condition that the heat pump system is at risk of refrigerant shortage, control the compressor to shut down.

[0066] The first preset condition specifically refers to the quantitative relationship, target value range, and / or magnitude relationship that the first and second temperature data need to achieve when there is a risk of refrigerant shortage during the compressor start-up process.

[0067] When the first temperature data and the second temperature data reach the first preset condition, it indicates that there is a risk of refrigerant shortage in the heat pump system. In this case, the compressor can be shut down to prevent the compressor from running in a refrigerant shortage state and to protect the compressor.

[0068] When the first temperature data and the second temperature data do not meet the first preset condition, it indicates that there is no risk of refrigerant shortage in the heat pump system, and the compressor is kept running. Furthermore, to ensure continuous and reliable operation of the compressor after it is started, when the first temperature data and the second temperature data do not meet the first preset condition, the process returns to step S10.

[0069] This invention proposes a control method for an environmental conditioning device equipped with a heat pump system. During compressor startup, the method monitors a first temperature data on the air inlet side of the heat exchanger and a second temperature data on the air return side of the compressor. When the first and second temperature data meet a first preset condition indicating a refrigerant shortage risk in the heat pump system, the compressor is shut down. The first temperature data accurately reflects the operating condition of the heat exchanger in the air duct during compressor startup, while the second temperature data accurately reflects the refrigerant return to the compressor after circulation and heat exchange. Combining the first and second temperature data accurately characterizes the refrigerant shortage risk in the heat pump system. By promptly shutting down the compressor when this risk exists, the method ensures that the compressor will not overheat or wear due to refrigerant shortage, reducing the risk of compressor damage due to refrigerant shortage in the environmental conditioning device and effectively improving the reliability of the heat pump system.

[0070] Furthermore, in the above embodiments, the first preset condition includes a first sub-condition or a second sub-condition, and step S20 includes:

[0071] When the first temperature data and the second temperature data reach the first sub-condition, the compressor is controlled to shut down; or,

[0072] When the first temperature data and the second temperature data reach the second sub-condition, the compressor is controlled to shut down;

[0073] The first sub-condition includes that the temperature difference between the air inlet side and the air return side is less than a preset temperature difference value, and the temperature change value between the air inlet side and the air return side is less than a preset temperature change value. The second sub-condition includes that the temperature difference between the air inlet side and the air return side is less than a preset temperature difference value, and the temperature change value of the air return side is greater than or equal to a preset temperature change value.

[0074] The preset temperature difference value, preset temperature difference change value, and preset temperature change value can be fixed values ​​set in advance, or values ​​obtained based on the actual operating conditions of the environmental control equipment.

[0075] The first temperature data and the second temperature data may include the inlet air temperature of the heat exchanger and the return air temperature of the compressor detected at the current time or at a time before the current time when the preset conditions are met. The difference between the inlet air temperature and the return air temperature can be used as the temperature difference value.

[0076] In this embodiment, the temperature difference change value is the rate of change of the temperature difference between the inlet air temperature and the return air temperature. In other embodiments, the temperature difference change value is the amplitude of the temperature difference between the inlet air temperature and the return air temperature. Specifically, the first temperature data may include the first inlet air temperature detected at a first moment and the second inlet air temperature detected at a second moment during the compressor start-up process. The second temperature data may include the first return air temperature detected at a first moment and the second return air temperature detected at a second moment during the compressor start-up process. A first difference between the first inlet air temperature and the first return air temperature, a second difference between the second inlet air temperature and the second return air temperature are determined. The interval between the first moment and the second moment is determined. The absolute value of the difference between the first difference and the second difference is determined. The ratio of the absolute value to the interval is used as the temperature difference change value. In other embodiments, the absolute value can also be directly used as the temperature difference change value. Here, the later of the first moment and the second moment can be the current moment, or both can be moments during the compressor start-up process before the current moment.

[0077] In this embodiment, the temperature change value is the amplitude of the temperature change on the return gas side of the compressor when it is in the on state. In other embodiments, the temperature change value is the rate of temperature change on the return gas side of the compressor when it is in the on state. Specifically, the first temperature data may include the third return gas temperature at a third moment or within the same time period during the compressor's on-state, and the second temperature data may include the fourth return gas temperature at a fourth moment or within the same time period during the compressor's on-state. The temperature change value is determined based on the difference between the fourth and third return gas temperatures.

[0078] If the compressor's return gas temperature and the heat exchanger's inlet air temperature satisfy the first sub-condition during compressor startup, it indicates that the temperature difference between the compressor's return gas temperature and the inlet air temperature is consistently too small. This can be attributed to insufficient refrigerant circulating in the heat pump system, causing the heat exchanger in the duct to be unable to exchange heat normally. For example, if the heat exchanger in the duct is in an evaporating state and its evaporation temperature is too high due to a lack of refrigerant, the refrigerant temperature returning to the compressor will be too high and will remain close to the heat exchanger's inlet air temperature. Therefore, the risk of refrigerant shortage in the heat pump system can be accurately determined through the first sub-condition.

[0079] In addition, the return gas temperature of the compressor and the inlet air temperature of the heat exchanger meet the second sub-condition during the compressor start-up process. This indicates that the temperature difference between the return gas temperature and the inlet air temperature of the compressor is too small and the return gas temperature fluctuates greatly after the compressor starts up. This can be attributed to insufficient refrigerant circulating in the heat pump system, which prevents the heat exchanger in the air duct from providing enough heat for normal heat exchange. Therefore, the risk of refrigerant shortage in the heat pump system can be accurately determined through the second sub-condition.

[0080] Based on this, shutting down the compressor when the first and second temperature data reach the first or second sub-condition helps ensure that the compressor is shut down in a timely manner when there is a risk of refrigerant shortage in the heat pump system, further reducing the risk of the compressor operating in a refrigerant shortage state, thereby further protecting the compressor and effectively improving the reliability of the heat pump system operation.

[0081] In other embodiments, a preset condition may also be included, which may include a fifth sub-condition. The fifth sub-condition is that the temperature difference between the air inlet side and the air return side is less than a preset temperature difference value. When the first temperature data and the second temperature data reach the fifth sub-condition, the compressor is controlled to shut down.

[0082] Furthermore, based on the above embodiments, another embodiment of the control method for the environmental conditioning equipment of this application is proposed. In this embodiment, reference is made to... Figure 5 After step S10, the method further includes:

[0083] Step S21: When the compressor's operating time is less than a first preset time, determine whether the first temperature data and the second temperature data meet the first sub-condition; if the determination result is that the first temperature data and the second temperature data meet the first sub-condition, control the compressor to shut down.

[0084] Step S22: When the compressor's operating time is greater than or equal to the second preset time, determine whether the first temperature data and the second temperature data meet the second sub-condition.

[0085] When the determination result is that the first temperature data and the second temperature data meet the second sub-condition, the compressor is controlled to shut down.

[0086] The compressor start-up duration can be obtained during or after step S10. Specifically, the compressor start-up duration can be detected during the compressor start-up process, and the required temperature data can be determined based on the corresponding sub-conditions according to the start-up duration, serving as the first temperature data and the second temperature data.

[0087] In this embodiment, when the compressor start-up time is short, identifying the risk of refrigerant shortage in the heat pump system based on the first sub-condition helps to avoid the impact of return gas temperature fluctuations during the compressor's start-up frequency ramp-up process on the accuracy of refrigerant shortage risk identification, thereby further reducing the risk of compressor damage due to refrigerant shortage. When the compressor start-up time is long, identifying the risk of refrigerant shortage in the heat pump system based on the second sub-condition, after the compressor enters stable operation, when the temperature difference between the return gas temperature and the inlet air temperature is too small, the change in return gas temperature can more accurately reflect the operating status of the compressor during the start-up process affected by the amount of refrigerant, which can effectively improve the accuracy of identifying the refrigerant shortage status of the heat pump system at this stage, and further reduce the risk of compressor damage due to refrigerant shortage.

[0088] Furthermore, in this embodiment, before the step of determining whether the first temperature data and the second temperature data meet the first sub-condition, the method further includes: when the compressor's operating time is less than a third preset time, determining a first preset temperature difference change value as the preset temperature difference change value; when the compressor's operating time is greater than or equal to the third preset time and less than the first preset time, determining a second preset temperature difference change value as the preset temperature difference change value; wherein, the first preset temperature difference change value is less than the second preset temperature difference change value.

[0089] When the start-up time is less than the third preset time, the compressor is in its first operating cycle after startup. During this cycle, the compressor starts and operates at increased frequency. Using a smaller preset temperature difference value during this process helps avoid misidentification of refrigerant shortage due to the small temperature difference caused by the compressor's return gas temperature slowly changing close to the heat exchanger's inlet air temperature. Conversely, when the start-up time is greater than or equal to the third preset time but less than the first preset time, the compressor's return gas temperature has reached a state with a significant deviation from room temperature. In this case, using a larger preset temperature difference value helps avoid misinterpreting temperature fluctuations within a reasonable range during normal heat exchange in the heat pump system as refrigerant shortage. Therefore, this application sets different preset temperature difference values ​​based on different start-up time intervals to identify refrigerant shortage in the heat pump system. This further improves the accuracy of refrigerant shortage identification and reduces the risk of compressor damage due to refrigerant shortage.

[0090] Furthermore, in this embodiment, the second temperature data includes at least two first sub-temperatures detected within a first time period and at least two second sub-temperatures detected within a second time period. The compressor's operating time within the first time period is less than the second preset time period, and the compressor's operating time within the second time period is greater than or equal to the second preset time period. After the step of obtaining the first temperature data on the air inlet side of the heat exchanger and the second temperature data on the air return side of the compressor, the method further includes: when the compressor's operating time is greater than or equal to the second preset time period, determining the minimum temperature value among the at least two first sub-temperatures, determining the maximum temperature value among the at least two second sub-temperatures; and determining the temperature change value based on the difference between the maximum temperature value and the minimum temperature value.

[0091] In this embodiment, the temperature change value is the difference between the maximum temperature value and the minimum temperature value. In other embodiments, the temperature change value may also be the result of adjusting the difference between the maximum temperature value and the minimum temperature value according to a preset coefficient or a coefficient determined by the actual operating state parameters of the environmental control equipment.

[0092] In this embodiment, the temperature change value is determined by the minimum return gas temperature value in the initial stage after the compressor is turned on and the maximum return gas temperature value in the operation stage close to the current moment. This allows the temperature change value to accurately reflect the return gas temperature change during the entire operation process after the compressor has been running for a long time. As a result, the change in refrigerant quantity after the compressor has been running for a long time can be accurately identified based on the temperature change value. This effectively improves the accuracy of refrigerant shortage identification in the heat pump system and allows the compressor to be shut down in time, which is beneficial to further reduce the damage to the compressor caused by refrigerant shortage.

[0093] Furthermore, based on any of the above embodiments, another embodiment of the control method for the environmental conditioning equipment of this application is proposed. In this embodiment, reference is made to... Figure 6 After step S20, the following steps are also included:

[0094] Step S30: Obtain the compressor shutdown duration, the third temperature data of the air inlet side of the heat exchanger during the start-up phase before the compressor shuts down, and the fourth temperature data of the air return side of the compressor during the start-up phase before the compressor shuts down.

[0095] The third temperature data includes one or more third temperature values ​​on the air inlet side of the heat exchanger. The third temperature value can be the air inlet temperature of the heat exchanger detected during the continuous operation phase before the compressor shuts down, or it can be the air inlet temperature of the heat exchanger detected during multiple start-up phases corresponding to multiple protection shutdowns before the compressor shuts down.

[0096] The fourth temperature data includes one or more fourth temperature values ​​on the compressor return side. The fourth temperature value may be the compressor return side temperature detected during the continuous operation phase before the compressor is shut down, or the compressor return side temperature detected during the continuous operation phase before the compressor is shut down.

[0097] The third and fourth temperature data are both data detected by the aforementioned third and fourth temperature sensors before the compressor shuts down. Specifically, during the compressor shutdown process, data detected by the third and fourth temperature sensors can be acquired during one or more startup phases prior to shutdown, and the detected data can be partially or entirely used as the corresponding third and fourth temperature data.

[0098] Step S40: When the shutdown duration is greater than or equal to the fourth preset duration, and / or when the third temperature data and the fourth temperature data meet the second preset condition that the heat pump system does not have a risk of refrigerant shortage, control the compressor to start.

[0099] In this embodiment, when the shutdown duration is greater than or equal to the fourth preset duration, and the third and fourth temperature data meet the second preset condition, the heat pump system can be considered to be free of refrigerant shortage risk. In other embodiments, the heat pump system can also be considered to be free of refrigerant shortage risk when either the shutdown duration is greater than or equal to the fourth preset duration or the third and fourth temperature data meet the second preset condition.

[0100] Furthermore, in this embodiment, the second preset condition includes the number of times the first sub-condition or the second sub-condition is satisfied during the start-up phase before the compressor is shut down being less than or equal to a preset threshold. Specifically, the data of the third temperature data and the fourth temperature data in the first stage of the target start-up phase before the compressor is shut down are the first target data, and the data of the third temperature data and the fourth temperature data in the second stage of the target start-up phase before the compressor is shut down are the second target data. The start-up time of the compressor in the first stage is less than a fifth preset time, and the start-up time of the compressor in the second stage is greater than or equal to the fifth preset time. The number of times can include the sum of the number of times the first target data corresponding to the target start-up phase satisfies the first sub-condition and the number of times the second target data satisfies the second sub-condition. The number of target start-up phases can be more than one, and the more than one target start-up phase is a continuous operation phase after more than one compressor protection shutdown and restart.

[0101] Specifically, the preset temperature difference change value in the first sub-condition during the shutdown process can be the first preset temperature difference change value mentioned above, or it can be other values.

[0102] In this embodiment, the refrigerant shortage is accurately eliminated by the shutdown duration and / or the third and fourth temperature data, and the compressor is automatically turned on in a timely manner. Based on this, it is beneficial to meet the normal heat exchange requirements of the heat pump system while protecting the compressor.

[0103] In other embodiments, the system may be determined to be free of refrigerant shortage upon receiving a preset command input by the user, and the compressor may be controlled to start. In other embodiments, the system may be determined to be free of refrigerant shortage when the shutdown duration is greater than or equal to a fourth preset duration, and when the third temperature data and the fourth temperature data do not meet the first sub-condition and / or the second sub-condition, and the compressor may be controlled to start.

[0104] Furthermore, this invention also proposes a storage medium storing a control program for an environmental control device. When the control program for the environmental control device is executed by a processor, it implements the relevant steps of any of the above embodiments of the control method for the environmental control device.

[0105] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0106] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0107] 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) as described above, and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, environmental control device, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0108] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A control method for an environmental control device, characterized in that, The environmental control equipment includes an air duct and a heat pump system. The heat pump system includes a compressor and a heat exchanger located within the air duct. The control method for the environmental control equipment includes the following steps: The compressor is controlled to start, and the first temperature data of the air inlet side of the heat exchanger and the second temperature data of the air return side of the compressor are acquired. When the first temperature data and the second temperature data reach a first preset condition indicating a risk of refrigerant shortage in the heat pump system, the compressor is controlled to shut down. The first preset condition includes a first sub-condition or a second sub-condition. The step of controlling the compressor to shut down when the first temperature data and the second temperature data reach the first preset condition indicating a risk of refrigerant shortage in the heat pump system includes: When the first temperature data and the second temperature data reach the first sub-condition, the compressor is controlled to shut down; or, When the first temperature data and the second temperature data reach the second sub-condition, the compressor is controlled to shut down; The first sub-condition includes that the temperature difference between the air inlet side and the air return side is less than a preset temperature difference value, and the temperature change between the air inlet side and the air return side is less than a preset temperature change value. The second sub-condition includes that the temperature difference between the air inlet side and the air return side is less than a preset temperature difference value, and the temperature change on the air return side is greater than or equal to a preset temperature change value. After the step of acquiring the first temperature data on the inlet side of the heat exchanger and the second temperature data on the return side of the compressor, the method further includes: When the compressor's operating time is less than a first preset time, determine whether the first temperature data and the second temperature data meet the first sub-condition; When the compressor's operating time is greater than or equal to the second preset time, determine whether the first temperature data and the second temperature data meet the second sub-condition; Wherein, the second preset duration is greater than or equal to the first preset duration.

2. The control method for the environmental control equipment as described in claim 1, characterized in that, Before the step of determining whether the first temperature data and the second temperature data meet the first sub-condition, the method further includes: When the compressor's operating time is less than the third preset time, the first preset temperature difference change value is determined to be the preset temperature difference change value; When the compressor's operating time is greater than or equal to the third preset time and less than the first preset time, the second preset temperature difference change value is determined to be the preset temperature difference change value. Wherein, the first preset temperature difference change value is less than the second preset temperature difference change value.

3. The control method for the environmental control equipment as described in claim 1, characterized in that, The second temperature data includes at least two first sub-temperatures detected within a first time period and at least two second sub-temperatures detected within a second time period. The compressor's operating time within the first time period is less than the second preset time period, and the compressor's operating time within the second time period is greater than or equal to the second preset time period. After the step of acquiring the first temperature data on the inlet side of the heat exchanger and the second temperature data on the return side of the compressor, the method further includes: When the compressor's operating time is greater than or equal to the second preset time, the minimum temperature value among the at least two first sub-temperatures is determined, and the maximum temperature value among the at least two second sub-temperatures is determined. The temperature change value is determined based on the difference between the maximum temperature value and the minimum temperature value.

4. The control method for the environmental control equipment as described in any one of claims 1 to 3, characterized in that, After the step of controlling the compressor to shut down when the first temperature data and the second temperature data reach a first preset condition indicating a risk of refrigerant shortage in the heat pump system, the method further includes: The compressor shutdown duration, the third temperature data of the heat exchanger's inlet side during the start-up phase before the compressor shuts down, and the fourth temperature data of the compressor's return side during the start-up phase before the compressor shuts down are obtained. When the shutdown duration is greater than or equal to the fourth preset duration, and / or when the third temperature data and the fourth temperature data meet the second preset condition that the heat pump system has no risk of refrigerant shortage, the compressor is controlled to start.

5. The control method for the environmental control equipment as described in claim 4, characterized in that, The second preset condition includes that the number of times the first sub-condition or the second sub-condition is met during the start-up phase before the compressor is shut down is less than or equal to a preset threshold. The first sub-condition includes that the temperature difference between the air inlet side and the air return side is less than a preset temperature difference value, and the temperature change value between the air inlet side and the air return side is less than a preset temperature change value. The second sub-condition includes that the temperature difference between the air inlet side and the air return side is less than a preset temperature difference value, and the temperature change value of the air return side is greater than or equal to a preset temperature change value.

6. The control method for the environmental control equipment as described in any one of claims 1 to 3, characterized in that, After the steps of controlling the compressor to start and acquiring the first temperature data on the inlet side of the heat exchanger and the second temperature data on the return side of the compressor, the method further includes: When the first temperature data and the second temperature data do not meet the first preset condition, return to the step of controlling the compressor to start and obtaining the first temperature data on the air inlet side of the heat exchanger and the second temperature data on the air return side of the compressor.

7. An environmental control device, characterized in that, The environmental control equipment includes: Air duct; A heat pump system, comprising a compressor and a heat exchanger located within the air duct, A control device, wherein the heat pump system is connected to the control device, the control device comprising: a memory, a processor, and a control program for an environmental conditioning device stored in the memory and executable on the processor, wherein the control program for the environmental conditioning device, when executed by the processor, implements the steps of the control method for the environmental conditioning device as described in any one of claims 1 to 6.

8. A storage medium, characterized in that, The storage medium stores a control program for an environmental control device, which, when executed by a processor, implements the steps of the control method for an environmental control device as described in any one of claims 1 to 6.

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