Air conditioning system

Abstract

The invention discloses an air conditioning system which comprises a heat pump unit and a controller, the heat pump unit comprises a refrigerant circulation loop, an air return duct, an air outlet duct and an inner fan, the inner fan is used for generating an air supply flow path, and air flow in the air supply flow path enters the air return duct from an indoor space; the air flow flows through an indoor heat exchanger in the refrigerant circulation loop from the air return duct and then flows out of the air outlet duct, and the air flow is heated by an independent heat source unit located in the indoor space before entering the air return duct from the indoor space; the controller is used for controlling operation of the heat pump unit, and the controller is configured to control the compressor to be started and control the inner fan to be kept closed when a heating mode instruction is received; the return air temperature and the coil pipe temperature of the indoor heat exchanger are obtained, and the operation frequency of the compressor is adjusted according to the return air temperature and the coil pipe temperature so that the coil pipe temperature can rise; and when the operation frequency of the compressor reaches the first preset frequency or the temperature of the coil pipe reaches the first preset temperature, the inner fan is controlled to be started.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more particularly to an air conditioning system. Background Technology

[0002] Currently, air conditioning systems typically deliver air to different areas (such as different rooms) through multiple air outlet ducts. The operating conditions of the air conditioning system are adjusted by the return air temperature fed back by sensors installed in the return air duct. However, if a heat source is located in the area where the return air duct is located, the air in the indoor space will be heated by the heat source, causing the hot air to rise and flow into the return air duct. This results in the air conditioning system detecting an excessively high return air temperature, causing the air conditioning system to misjudge the ambient temperature during heating operation and reduce the heating capacity. Consequently, the air conditioning system cannot heat and deliver air normally, cannot quickly adjust the temperature of the indoor space, cannot meet the user's heating needs, and seriously affects the user experience. Summary of the Invention

[0003] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide an air conditioning system that can reduce the impact of heat sources in the indoor space on the heating operation of the air conditioning system and meet the user's heating needs.

[0004] In a first aspect, embodiments of the present invention provide an air conditioning system, including a heat pump unit and a controller, wherein: The heat pump unit includes a refrigerant circulation loop, a return air duct, an outlet air duct, and an indoor fan. The refrigerant circulation loop includes a compressor, an indoor heat exchanger located between the return air duct and the outlet air duct, and a refrigerant pipeline connecting the compressor and the indoor heat exchanger. The indoor fan is used to generate an air supply path. The airflow in the air supply path enters the return air duct from the indoor space, flows through the indoor heat exchanger from the return air duct, and then flows out from the outlet air duct. The airflow is heated by an independent heat source unit located in the indoor space before entering the return air duct from the indoor space. The controller is used to control the operation of the heat pump unit, and the controller is configured to: When a heating mode command is received, the compressor is started and the internal fan is kept off. The return air temperature and the coil temperature of the indoor heat exchanger are obtained, and the compressor operating frequency is adjusted according to the return air temperature and the coil temperature to increase the coil temperature. When the compressor operating frequency reaches a first preset frequency or when the coil temperature reaches a first preset temperature, the internal fan is controlled to start.

[0005] The air conditioning system provided by the embodiments of the present invention has at least the following beneficial effects: When the air conditioning system receives a heating mode command, in order to prevent the air conditioning system from immediately blowing out insufficiently heated cold air at the beginning of the heating mode operation, the compressor can be started and the indoor fan can be kept off to allow the indoor heat exchanger to fully store heat and increase the coil temperature, so as to heat the air around the indoor heat exchanger to a suitable temperature; however, when the independent heat source unit heats the airflow flowing into the return air duct, causing the return air temperature to be too high, the air conditioning system may misjudge the ambient temperature and incorrectly determine that the temperature difference between the ambient temperature and the target required temperature is small, thus reducing the compressor speed. To reduce heating capacity, the air conditioning system adjusts the compressor's operating frequency by considering both return air temperature and coil temperature. This raises the coil temperature and increases the system's heating capacity. The system aims to reach either a preset compressor frequency or a preset coil temperature, ensuring sufficient heating to meet demand. This, in turn, controls the indoor fan to start, ensuring the system can still quickly and normally heat and deliver air even under the influence of independent heat source units. This reduces the impact of heat sources in the indoor space on the air conditioning system's heating operation, improving its heating response speed and efficiency, and ultimately meeting the user's heating needs.

[0006] In the air conditioning system provided in this embodiment of the invention, adjusting the compressor operating frequency based on the return air temperature and the coil temperature includes: The ratio of the coil temperature to the return air temperature is used as an adjustment coefficient; Multiply the current compressor operating frequency by the adjustment coefficient to obtain the adjusted compressor operating frequency.

[0007] In the air conditioning system provided in this embodiment of the invention, the controller is further configured to: Within a first preset time period after receiving the heating mode command, if the return air temperature is greater than or equal to the target set temperature, the target set temperature is increased and adjusted according to the return air temperature.

[0008] In the air conditioning system provided in this embodiment of the invention, the step of increasing the target set temperature based on the return air temperature includes: The return air temperature is added to the second preset temperature to obtain the increased target set temperature.

[0009] Secondly, embodiments of the present invention provide an air conditioning system, including a heat pump unit and a controller, wherein: The heat pump unit includes a refrigerant circulation loop, a return air duct, an outlet air duct, and an indoor fan. The refrigerant circulation loop includes a compressor, an indoor heat exchanger located between the return air duct and the outlet air duct, and a refrigerant pipeline connecting the compressor and the indoor heat exchanger. The indoor fan is used to generate an air supply path. The total airflow of the air supply path enters the return air duct from the indoor space, flows through the indoor heat exchanger from the return air duct, and then flows out from the outlet air duct. The airflow is heated by an independent heat source unit located in the indoor space before entering the return air duct from the indoor space. The controller is used to control the operation of the heat pump unit, and the controller is configured to: When a heating mode command is received, the return air temperature and the target set temperature are obtained; Within a first preset time period after receiving the heating mode command, if the return air temperature is greater than or equal to the target set temperature, the target set temperature is increased and adjusted according to the return air temperature, and the compressor is controlled to start.

[0010] The air conditioning system provided by the embodiments of the present invention has at least the following beneficial effects: Since the independent heat source unit heats the airflow flowing into the return air duct, resulting in a higher return air temperature, after receiving the heating mode command, the air conditioning system will pay attention to the relationship between the return air temperature and the target set temperature. If the return air temperature is greater than or equal to the target set temperature due to the influence of the independent heat source unit, the controller will actively increase the target set temperature and start the compressor. This avoids insufficient heating due to misjudging that the ambient temperature is close to the target set temperature, ensuring a rapid response of the air conditioning system when the heating mode command appears. It can quickly reach the indoor temperature expected by the user, improve heating efficiency, and the target set temperature is adjusted based on the return air temperature, which can help to accurately judge and meet the user's heating needs when there is a heat source influence near the return air duct.

[0011] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0012] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1This is a schematic diagram of the structure of the air conditioning system provided in an embodiment of the present invention; Figure 2 This is a schematic diagram illustrating the effect of the air supply flow path of the air conditioning system provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the electrical connection between the controller and other components in the air conditioning system provided in an embodiment of the present invention; Figure 4 This is a control flow diagram of the controller in the air conditioning system provided in the embodiment of the present invention; Figure 5 This is a control flow diagram of the controller in an air conditioning system provided in another embodiment of the present invention; Figure 6 This is a schematic diagram of the overall control flow of the air conditioning system provided in an embodiment of the present invention. Detailed Implementation

[0014] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0015] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the number itself, while "above," "below," "within," etc. are understood to include the number itself. "Any one" refers to one or more, and "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or multiple items. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0016] It should be noted that the terms "setting," "installing," and "connecting" in the embodiments of this invention should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of the above terms in the embodiments of this invention in conjunction with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or a connection that allows for mutual communication; it can be a direct connection or an indirect connection through an intermediate medium.

[0017] It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0018] Currently, air conditioning systems typically deliver air to different areas (such as different rooms) through multiple air outlet ducts. The operating conditions of the air conditioning system are adjusted by the return air temperature fed back by sensors installed in the return air duct. If a heat source is located in the area where the return air duct is located, the rising hot air will flow into the return air duct, causing the return air temperature in the return air duct to be higher than normal. This causes the air conditioning system to misjudge the actual ambient temperature and operate at a lower frequency, resulting in low heating capacity. Consequently, the air conditioning system cannot heat and deliver air normally. After the air conditioning system starts heating, it immediately enters a low-frequency heating and anti-cold air state, and the heating capacity does not meet the user's needs, which seriously affects the user's experience.

[0019] Based on this, this invention proposes an air conditioning system. When the air conditioning system receives a heating mode command, to prevent the system from immediately blowing out insufficiently heated cold air at the beginning of heating mode operation, the compressor can be started while the indoor fan is kept off. This allows the indoor heat exchanger to fully store heat, raising the coil temperature and heating the air around the heat exchanger to a suitable temperature. However, when the independent heat source unit heats the airflow flowing into the return air duct, causing the return air temperature to be too high, the air conditioning system may misjudge the ambient temperature, incorrectly determining that the temperature difference between the ambient temperature and the target required temperature is small, and thus reducing the compressor operating frequency. To reduce heating capacity, the air conditioning system comprehensively considers the return air temperature and coil temperature, adjusting the compressor operating frequency to raise the coil temperature and increase the heating capacity of the air conditioning system. This ensures the compressor operating frequency or coil temperature reaches a first preset frequency, meeting the heating demand. This, in turn, controls the indoor fan to start, ensuring the air conditioning system can still quickly and normally heat and deliver air even under the influence of independent heat source units. This reduces the impact of heat sources in the indoor space on the heating operation of the air conditioning system, improving the heating response speed and efficiency of the air conditioning system, and meeting the user's heating needs.

[0020] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0021] Reference Figure 1 and Figure 3 , Figure 1 This is a schematic diagram of the air conditioning system provided in an embodiment of the present invention. Figure 3This is a schematic diagram of the electrical connections between the controller and other components in the air conditioning system provided in this embodiment of the invention. The air conditioning system includes a heat pump unit and a controller 600. The heat pump unit achieves indoor space temperature regulation through refrigerant circulation and airflow. The heat pump unit includes a refrigerant circulation loop for heat exchange with indoor air, an air outlet duct 200 for supplying air to the indoor space, a return air duct 300 for recovering air from the indoor space, and an indoor fan 400 for driving airflow. The refrigerant circulation loop includes a compressor 110, an indoor heat exchanger 120, an electronic expansion valve 140, an outdoor heat exchanger 130, and a refrigerant pipeline 150. The compressor 110 is connected to the indoor heat exchanger 120 through the refrigerant pipeline 150. The indoor heat exchanger 120 is connected to the electronic expansion valve 140 through a refrigerant pipeline. The electronic expansion valve 140 is connected to the outdoor heat exchanger 130 through a refrigerant pipeline. The outdoor heat exchanger 130 is connected to the compressor 110 through a refrigerant pipeline. The indoor heat exchanger 120 is located between the return air duct 300 and the outlet air duct 200. It is a component that allows heat exchange between the refrigerant and the air in the indoor space. When the air conditioning system is in heating mode, the compressor 110 compresses the refrigerant and delivers the high-temperature refrigerant gas to the indoor heat exchanger 120. The refrigerant releases heat in the indoor heat exchanger 120 to the air in the surrounding environment. The indoor fan 400 creates an airflow path between the indoor space and the air conditioning system. The airflow path created by the indoor fan 400 guides the air in the indoor space to flow towards the return air duct 300 and then to the indoor heat exchanger 120, where it exchanges heat with the refrigerant. The air that has exchanged heat with the surrounding environment of the indoor heat exchanger 120 is then blown into the indoor space from the outlet air duct 200. It should be noted that a return air temperature sensor 310 is installed in the return air duct 300. The return air temperature sensor 310 can measure the return air temperature in the return air duct 300. The controller 600 can connect to the return air temperature sensor 310, obtain the return air temperature measured by the return air temperature sensor 310, use the return air temperature to determine the ambient temperature of the current environment of the air conditioning system, determine whether the ambient temperature meets the user's requirements, and then control the compressor 110 to operate based on the return air temperature.

[0022] Reference Figure 2 , Figure 2 This is a schematic diagram illustrating the effect of the air supply flow path of the air conditioning system provided in this embodiment of the invention. It is worth noting that the air conditioning system, through the air supply flow path generated by the indoor fan 400, blows the air, after heat exchange in the indoor heat exchanger 120, into the indoor space through the outlet air duct 200, and introduces air into the indoor space through the return air duct 300. Simultaneously, a return air temperature sensor 310 is installed at the return air duct 300 to measure the return air temperature, determine the ambient temperature of the indoor space, and then control the operating conditions of the air conditioning system based on the return air temperature. And as... Figure 2 As shown, an independent heat source unit 500 is installed in the indoor space. The independent heat source unit 500 is not controlled by the controller 600. When the independent heat source unit 500 is working, it heats the air in the indoor space. The heated air flows into the return air duct 300 through the airflow generated by the indoor fan 400. This causes the return air temperature in the return air duct 300 to be too high. As a result, the controller 600 incorrectly judges the ambient temperature of the current environment where the air conditioning system is located. It mistakenly believes that the current ambient temperature is close to the user's required temperature or that the current ambient temperature has reached the user's required temperature. Therefore, it controls the air conditioning system to reduce the heating capacity (such as reducing the compressor operating frequency, turning off the indoor fan 400, etc.), which in turn causes the air conditioning system to fail to blow hot air normally.

[0023] Reference Figure 3 The controller 600 is connected to the compressor 110 and the indoor fan 400 of the heat pump unit, and also to the return air temperature sensor 310 located in the return air duct 300. Therefore, the controller 600 can control the compressor operating frequency, or control the indoor fan 400 to start or stop, or obtain the return air duct 300 temperature measured by the temperature sensor. In addition, a coil temperature sensor 121 is installed in the indoor heat exchanger 120, and the controller 600 can be connected to the coil temperature sensor 121 to obtain the coil temperature.

[0024] Reference Figure 4 , Figure 4 This is a control flow diagram of the controller 600 in the air conditioning system provided in this embodiment of the invention. The control flow of the controller 600 includes, but is not limited to, the following steps: Step S110: When a heating mode command is received, control the compressor 110 to start and control the indoor fan 400 to remain off; Step S120: Obtain the return air temperature and the coil temperature of the indoor heat exchanger 120, and adjust the compressor operating frequency according to the return air temperature and the coil temperature; Step S130: When the compressor operating frequency reaches the first preset frequency or when the coil temperature reaches the first preset temperature, control the internal fan 400 to start.

[0025] Understandably, when the controller 600 receives a heating mode command, it may assume that the user is dissatisfied with the ambient temperature of the current environment where the air conditioning system is located and needs the air conditioning system to heat and deliver hot air to increase the ambient temperature, i.e., the return air temperature. However, in order to prevent the air conditioning system from immediately blowing out unheated cold air at the beginning of the heating mode operation, it is necessary to control the compressor 110 to start and keep the indoor fan 400 off to allow the indoor heat exchanger 120 to fully store heat and increase the coil temperature to heat the air around the indoor heat exchanger 120 to a suitable temperature. However, when the independent heat source unit 500 heats the airflow flowing into the return air duct 300, causing the return air temperature to be too high, the air conditioning system may misjudge the ambient temperature and incorrectly determine that the temperature difference between the ambient temperature and the target required temperature is small, thus reducing the operating frequency of the compressor 110 and reducing the heating capacity. The independent heat source unit 500 set in the same indoor space will heat the air in the indoor space. The heated air will rise and flow to the return air duct 300. If the air conditioning system is affected by the independent heat source unit 500 and misjudges the current ambient temperature, it will mistakenly believe that the current ambient temperature (return air temperature) is small compared with the target temperature requirement, and also mistakenly believe that the required heating capacity is small, and reduce the heating capacity of the air conditioning system, thus failing to meet the user's heating needs.

[0026] Therefore, the coil temperature can be obtained through the coil temperature sensor 121 installed in the indoor heat exchanger 120, and the return air temperature can be obtained through the return air temperature sensor 310. The return air temperature is used to determine the ambient temperature of the current environment where the air conditioning system is located, and the coil temperature is used to determine the current heating capacity of the air conditioning system. The compressor operating frequency is adjusted by combining the return air temperature and the coil temperature to control the heating capacity of the air conditioning system. Specifically, when the coil temperature is low and the return air temperature is high, it can be assumed that the return air temperature is higher due to the effect of the independent heat source unit 500, which can increase the compressor operating frequency, help to quickly increase the coil temperature, and thus increase the heating capacity, so that the air conditioning system can blow out hot air more quickly to meet the user's heating needs. By adjusting the compressor operating frequency, the coil temperature is increased so that the compressor operating frequency reaches the first preset frequency or the coil temperature reaches the first preset temperature. At this time, it can be assumed that the current heating capacity of the air conditioning system meets the demand, and the temperature of the air around the indoor heat exchanger 120 is high, so the indoor fan 400 can be started to blow hot air into the indoor space.

[0027] In other words, after receiving the heating mode command, the air conditioning system, in order to prevent only starting the compressor 110 while keeping the indoor fan 400 off to blow out cold air, adjusts the compressor operating frequency based on both the return air temperature and the coil temperature, even when the return air temperature detected by the air conditioning system is affected by the independent heat source unit 500 in the same indoor space. This raises the coil temperature and increases the heating capacity of the air conditioning system. This avoids the erroneous operation of reducing heating capacity due to the return air temperature affected by the independent heat source unit 500. The system ensures that the compressor operating frequency or the coil temperature reaches the first preset frequency or the first preset temperature, thus meeting the heating demand. This allows the indoor fan 400 to be started, ensuring that the air conditioning system can still quickly and normally heat and deliver air even under the influence of the independent heat source unit 500. This reduces the impact of heat sources in the indoor space on the heating operation of the air conditioning system, improves the heating response speed and efficiency of the air conditioning system, and meets the user's heating needs.

[0028] It should be noted that if the compressor operating frequency does not reach the first preset frequency, or the coil temperature does not reach the first preset temperature, it can be assumed that the current heating capacity of the air conditioning system is insufficient and the ambient air temperature around the indoor heat exchanger 120 is low. If the indoor fan 400 is started directly, the low-temperature air will be blown into the indoor space through the air outlet duct 200, affecting the user's experience.

[0029] Understandably, when adjusting the compressor operating frequency using return air temperature and coil temperature, the ratio of coil temperature to return air temperature can be used as an adjustment coefficient to obtain the current compressor operating frequency. This current frequency is then multiplied by the adjustment coefficient to obtain the adjusted compressor operating frequency, which is then used to control the compressor 110 to operate. Therefore, when the coil temperature is greater than the return air temperature, and the ratio between the coil temperature and return air temperature is larger, the adjustment range of the compressor operating frequency is greater. This allows for a rapid increase in the compressor operating frequency, quickly increasing the heating capacity of the air conditioning system and rapidly delivering hot air into the indoor space.

[0030] It should be noted that when the coil temperature is less than or equal to the return air temperature, the reciprocal of the ratio of the coil temperature to the return air temperature can be used as the adjustment coefficient, or the ratio of the coil temperature to the return air temperature plus one can be used as the adjustment coefficient. Therefore, it can be ensured that the adjustment coefficient is always greater than one, and the adjusted compressor operating frequency obtained by multiplying the current compressor operating frequency by the adjustment coefficient is higher than the current compressor operating frequency.

[0031] Understandably, the controller 600 can also be pre-configured with multiple ratio ranges, with different ratio ranges corresponding to different coefficients. After obtaining the coil temperature and return air temperature, it determines which ratio range the ratio between the coil temperature and the return air temperature falls into, and then uses the coefficient corresponding to that ratio range as an adjustment coefficient. The coefficient corresponding to the ratio range can change with the upper limit of the ratio range, that is, the coefficient corresponding to the ratio range can become larger as the upper limit of the ratio range increases.

[0032] Understandably, when adjusting the compressor's operating frequency, it's crucial to ensure it doesn't exceed the compressor's upper frequency limit. This upper frequency limit refers to the maximum frequency the compressor 110 can achieve under specific outdoor environmental conditions to maintain the stability and efficiency of the air conditioning system. This upper frequency limit can be determined based on the outdoor ambient temperature measured by the air conditioning system. Specifically, the relationship between the outdoor ambient temperature and the compressor's upper frequency limit can be pre-designed. First, a reasonable range of outdoor ambient temperature variations is determined. This range can be set based on the compressor 110's performance parameters, operating environment, and user needs. Based on this range, the limiting frequency for the compressor 110 under different outdoor ambient temperatures is then set. The limiting frequency also needs to consider factors such as the compressor 110's heating / cooling capacity, operating efficiency, and lifespan. Temperature sensors installed around the air conditioning system or outdoors are used to monitor the outdoor ambient temperature in real time. The measured outdoor ambient temperature is compared with the set limiting frequency's range of ambient temperature variations. If the current outdoor ambient temperature exceeds a certain threshold within the range, the corresponding limiting frequency can be used to update the compressor's upper frequency limit. Therefore, the controller 600 can also obtain the outdoor ambient temperature measured by the air conditioning system, and then determine the upper limit of the compressor frequency based on the outdoor ambient temperature. If, during the process of adjusting the compressor operating frequency, the adjusted compressor operating frequency is greater than the upper limit of the compressor frequency, the adjusted compressor operating frequency is limited to the upper limit of the compressor frequency, thereby reducing the compressor operating frequency to protect the compressor 110, improve energy efficiency, and extend the service life of the compressor 110.

[0033] Understandably, if increasing the compressor operating frequency does not reach the first preset frequency or the coil temperature does not reach the first preset frequency, the indoor fan should be kept off at 40°C to prevent the air conditioning system from blowing out cold air due to insufficient heat storage. It is still necessary to further increase the heating capacity of the air conditioning system. Specifically, the compressor operating frequency can be increased again to obtain the coil temperature, return air temperature, and compressor operating frequency again. The new coil temperature and return air temperature can be used to further increase the current compressor operating frequency to allow the coil temperature to continue to rise, thereby further increasing the heating capacity, until the adjusted compressor operating frequency reaches the first preset frequency or the heated coil temperature reaches the first preset temperature.

[0034] Understandably, upon receiving the heating mode command, the return air temperature can be monitored within a first preset time period. The return air temperature is compared with the target set temperature to determine if adjustment is necessary. This is because, in heating mode, if the independent heat source unit 500 preheats the indoor air, the return air temperature may be higher than the actual ambient temperature. This could lead to a misjudgment that the ambient temperature is already high enough, resulting in a reduction in heating capacity and preventing the indoor temperature from reaching the user's desired level. Alternatively, if the target set temperature is lower than or equal to the return air temperature, the air conditioning system may misjudge that the current ambient temperature has reached the target, causing the compressor 110 to shut down. This would result in the air conditioning system appearing "unable to heat" when the independent heat source is operating. Therefore, when the return air temperature is detected to be greater than or equal to the target set temperature, the target set temperature is actively increased. This allows the air conditioning system to more actively start and adjust components such as the compressor 110 and the indoor fan 400 to improve heating efficiency. This helps the air conditioning system deliver hot air to the indoor space more quickly, ensuring that the heating capacity is not reduced due to misjudgment of the ambient temperature during the heating process. The first preset duration provides a buffer and judgment time window, which helps to avoid misoperation caused by instantaneous temperature changes and improves the stability and reliability of air conditioning.

[0035] It should be noted that when the air conditioning system receives a heating mode command, it can mean that the air conditioning system is entering heating mode for the first time or re-entering it from other operating modes (such as cooling mode, dehumidification mode, etc.), or it can mean that the air conditioning system is turned on in heating mode from a state such as off or standby. After receiving the heating mode command, the air conditioning system will compare the return air temperature with the target set temperature within the first preset time to determine whether the target set temperature needs to be adjusted, and then adjust the compressor operating frequency according to the target set temperature and the return air temperature.

[0036] Specifically, when adjusting the target set temperature using the return air temperature, it can mean increasing the target set temperature to a value greater than the return air temperature, i.e., the increased target set temperature is greater than the return air temperature. A preset compensation coefficient can be obtained, which is multiplied by the return air temperature to get a compensation temperature value. This compensation temperature value is then added to the target set temperature to obtain the increased target set temperature. In other words, the higher the return air temperature, the higher the compensation temperature value, and the higher the increased target set temperature. This ensures that in scenarios with high heating demand, the air conditioning system can operate at a higher target set temperature, increasing heating output, reducing the impact of the independent heat source unit 500 on the air conditioning system's heating operation, and meeting the user's heating needs.

[0037] It is understandable that when the target set temperature is increased, a pre-set second preset temperature can be obtained. The second preset temperature is added to the return air temperature to obtain the increased target set temperature. The second preset temperature is a positive number. Therefore, the target set temperature is greater than the return air temperature, so the air conditioning system can think that the current ambient temperature has not reached the user's required value, and then control the compressor 110 to run for heating to ensure the heating capacity of the air conditioning system.

[0038] It should be noted that the second preset temperature can be a fixed value or it can change with the return air temperature. For example, multiple return air temperature ranges can be preset, and different return air temperature ranges correspond to different temperature adjustment values. The return air temperature is determined to fall into which return air temperature range, and the temperature adjustment value corresponding to the return air temperature range into which the return air temperature falls is used as the second preset temperature.

[0039] It is worth noting that if the return air temperature is lower than the target set temperature within the first preset time after receiving the heating mode command, it indicates that the target set temperature is set normally and the air conditioning system is already in normal heating mode. There is no need to adjust the target set temperature. The compressor operating frequency is adjusted according to the target set temperature and the return air temperature, and the indoor fan 400 is controlled to start running.

[0040] Reference Figure 5 , Figure 5 This is a control flow diagram of a controller 600 in an air conditioning system according to another embodiment of the present invention. The control flow of the controller 600 includes, but is not limited to, the following steps: Step S210: When a heating mode command is received, obtain the return air temperature and the target set temperature; Step S220: Within the first preset time after receiving the heating mode command, when the return air temperature is greater than or equal to the target set temperature, the target set temperature is increased and adjusted according to the return air temperature, and the compressor 110 is started.

[0041] Understandably, after receiving the heating mode command, the return air temperature and target set temperature can be monitored within a first preset time period. This first preset time period provides a buffer and judgment window, helping to avoid misoperation due to instantaneous temperature changes and improving the stability and reliability of the air conditioning system. Simultaneously, the air conditioning system can preheat components such as the compressor 110 and indoor heat exchanger 120 within this first preset time period. If, within the first preset time period after receiving the heating mode command, the return air temperature is greater than or equal to the target set temperature, it can be assumed that the return air temperature is affected by the heating of the independent heat source unit 500, or that the target set temperature itself is too low to meet the heating demand. To address this situation, if the return air temperature is detected to be greater than or equal to the target set temperature within the first preset time period after receiving the heating mode command, the target set temperature can be actively increased. This allows the air conditioning system to more actively start the compressor 110 and actively adjust the compressor's operating frequency to improve heating efficiency. This helps the air conditioning system to blow hot air into the indoor space more quickly and reduces the impact of the independent heat source unit 500 during the heating process.

[0042] It is worth noting that during the operation of the air conditioning system in heating mode, if the return air temperature is greater than or equal to the target set temperature and maintains the target set temperature, that is, if the air conditioning system is controlled to operate according to the current return air temperature and the target set temperature, then the ambient temperature of the indoor space can be considered to have reached the standard. The compressor operating frequency can be reduced or the compressor 110 can be stopped from starting, thereby reducing the heating capacity of the air conditioning system. Therefore, in other words, within the first preset time after the air conditioning system receives the heating mode command, if the detected return air temperature is greater than or equal to the target set temperature due to the influence of the independent heat source unit 500 and the target set temperature remains unchanged, the compressor 110 will be stopped from starting, resulting in the phenomenon of "unable to heat" such as the air conditioning system stopping immediately after starting heating, making it difficult for the air conditioning system to regulate the temperature of the indoor space.

[0043] It should be noted that when the air conditioning system receives a heating mode command, it means that the system may be switching from other operating modes (such as cooling mode, dehumidification mode, etc.) to heating mode for the first time or switching back to heating mode, or it may be starting up directly in heating mode from an inactive state such as shutdown or standby. During the initial preset time period thereafter, the air conditioning system will acquire the return air temperature and the target set temperature, compare and analyze them to determine whether the target set temperature needs to be increased. Then, based on the return air temperature and the adjusted target set temperature, the compressor operating frequency will be adjusted.

[0044] Specifically, the target set temperature is increased by adjusting the return air temperature, meaning that the adjusted target set temperature is greater than the return air temperature. During this adjustment process, the air conditioning system can obtain a second preset temperature and add it directly to the return air temperature to obtain the adjusted target set temperature. Since the second preset temperature is a positive value, it can ensure that the adjusted target set temperature is always greater than the return air temperature, thereby controlling the compressor 110 to start and actively respond to the increase in heating demand according to the adjusted target set temperature.

[0045] Furthermore, the second preset temperature can be determined based on the return air temperature. For example, a preset compensation coefficient can be obtained, and the second preset temperature can be obtained by multiplying the preset compensation coefficient by the return air temperature. Alternatively, multiple return air temperature ranges can be preset, with different return air temperature ranges corresponding to different temperature adjustment values. The system determines which return air temperature range the temperature falls into, and then uses the temperature adjustment value corresponding to that range as the second preset temperature. In other words, the higher the return air temperature, the higher the second preset temperature, and the higher the adjusted target set temperature. This ensures that in scenarios with high heating demand, the air conditioning system can heat at a higher target set temperature, increasing heating output, reducing the impact of the independent heat source unit 500 on the heating operation of the air conditioning system, and meeting the user's heating needs.

[0046] It is worth noting that if the return air temperature is lower than the target set temperature within the first preset time after receiving the heating mode command, it means that the target set temperature is set normally and the air conditioning system is already in normal heating mode. There is no need to adjust the target set temperature. The compressor operating frequency is adjusted according to the target set temperature and the return air temperature, and the indoor fan 400 is controlled to start running, so as to maintain a stable rise in the indoor temperature until the user's needs are met.

[0047] The control flow of the air conditioning system provided in the embodiments of the present invention will be illustrated below with a specific example.

[0048] Reference Figure 6 , Figure 6 This is a schematic diagram of the overall control flow of the air conditioning system provided in an embodiment of the present invention. Figure 3 As shown, in step S301, when an independent heat source unit 500 in the same indoor space is working, the air conditioning system receives a heating mode command and operates in heating mode; in step S302, within a first preset time after receiving the heating mode command, the target set temperature and return air temperature are monitored, and the target set temperature and return air temperature are compared; in step S303, if the target set temperature is greater than the return air temperature, the target set temperature is maintained, and the compressor 110 is started, then step S305 is executed; in step S304, if the target set temperature... If the return air temperature is less than or equal to the ambient temperature, a second preset temperature (e.g., 1 degree Celsius) is obtained. This second preset temperature is then added to the return air temperature, and the sum is the adjusted target set temperature. The compressor 110 is then started, and step S305 is executed. In step S305, after the compressor 110 starts, the indoor fan 400 is kept off. The current compressor operating frequency, return air temperature, coil temperature, and outdoor ambient temperature are obtained. In step S306, the upper limit of the compressor frequency is determined based on the outdoor ambient temperature. In step S307, the ratio of the coil temperature to the return air temperature is used as an adjustment coefficient. Multiply the current compressor operating frequency by the adjustment coefficient to obtain the adjusted compressor operating frequency; in step S308, compare the adjusted compressor operating frequency with the compressor frequency upper limit; in step S309, if the adjusted compressor operating frequency is greater than the compressor frequency upper limit, limit the adjusted compressor operating frequency to the compressor frequency upper limit and control the compressor 110 to operate using the limited compressor operating frequency; in step S310, if the adjusted compressor operating frequency is less than or equal to the compressor frequency upper limit, control the compressor 110 to operate using the adjusted compressor operating frequency; in step S311, reacquire the current coil temperature and compressor operating frequency, and compare the relationship between the coil temperature and the first preset temperature, and the relationship between the compressor operating frequency and the first preset frequency; in step S312, if the new compressor operating frequency is greater than or equal to the first preset frequency, or the new coil temperature is greater than or equal to the first preset temperature, control the indoor fan 400 to start; in step S313, if the new compressor operating frequency is less than the first preset frequency and the new coil temperature is less than the first preset temperature, control the indoor fan 400 to remain off, and repeat step S305.

[0049] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Integrated physical components, if implemented as software functional units and sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. As is known to those skilled in the art, a computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules, or other data. Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0050] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An air conditioning system, characterized in that, include: A heat pump unit includes a refrigerant circulation loop, a return air duct, an outlet air duct, and an indoor fan. The refrigerant circulation loop includes a compressor, an indoor heat exchanger located between the return air duct and the outlet air duct, and a refrigerant pipeline connecting the compressor and the indoor heat exchanger. The indoor fan is used to generate an air supply path. The airflow in the air supply path enters the return air duct from the indoor space, flows through the indoor heat exchanger, and then flows out of the outlet air duct. The airflow is heated by an independent heat source unit located in the indoor space before entering the return air duct from the indoor space. A controller for controlling the operation of the heat pump unit, the controller being configured to: When a heating mode command is received, the compressor is started and the internal fan is kept off. The return air temperature and the coil temperature of the indoor heat exchanger are obtained, and the compressor operating frequency is adjusted according to the return air temperature and the coil temperature to increase the coil temperature. When the compressor operating frequency reaches a first preset frequency or when the coil temperature reaches a first preset temperature, the internal fan is controlled to start.

2. The air conditioning system according to claim 1, characterized in that, The step of adjusting the compressor operating frequency based on the return air temperature and the coil temperature includes: The ratio of the coil temperature to the return air temperature is used as an adjustment coefficient; Multiply the current compressor operating frequency by the adjustment coefficient to obtain the adjusted compressor operating frequency.

3. The air conditioning system according to claim 1, characterized in that, The step of adjusting the compressor operating frequency based on the return air temperature and the coil temperature includes: The adjustment coefficient is determined based on the range within which the ratio of the coil temperature to the return air temperature falls. Multiply the current compressor operating frequency by the adjustment coefficient to obtain the adjusted compressor operating frequency.

4. The air conditioning system according to claim 2 or 3, characterized in that, The controller is also configured to: Obtain the outdoor ambient temperature and determine the upper limit of the compressor frequency based on the outdoor ambient temperature; When the adjusted compressor operating frequency is greater than the compressor frequency upper limit, the adjusted compressor operating frequency is limited to the compressor frequency upper limit.

5. The air conditioning system according to claim 1, characterized in that, The controller is also configured to: Within a first preset time period after receiving the heating mode command, if the return air temperature is greater than or equal to the target set temperature, the target set temperature is increased based on the return air temperature.

6. The air conditioning system according to claim 5, characterized in that, The step of increasing the target set temperature based on the return air temperature includes: The return air temperature is added to the second preset temperature to obtain the increased target set temperature.

7. An air conditioning system, characterized in that, include: A heat pump unit includes a refrigerant circulation loop, a return air duct, an outlet air duct, and an indoor fan. The refrigerant circulation loop includes a compressor, an indoor heat exchanger located between the return air duct and the outlet air duct, and a refrigerant pipeline connecting the compressor and the indoor heat exchanger. The indoor fan is used to generate an air supply path. The airflow in the air supply path enters the return air duct from the indoor space, flows through the indoor heat exchanger, and then flows out of the outlet air duct. The airflow is heated by an independent heat source unit located in the indoor space before entering the return air duct from the indoor space. A controller for controlling the operation of the heat pump unit, the controller being configured to: When a heating mode command is received, the return air temperature and the target set temperature are obtained; Within a first preset time period after receiving the heating mode command, if the return air temperature is greater than or equal to the target set temperature, the target set temperature is increased and adjusted according to the return air temperature, and the compressor is controlled to start.

8. The air conditioning system according to claim 7, characterized in that, The step of increasing the target set temperature based on the return air temperature includes: The return air temperature is added to the second preset temperature to obtain the increased target set temperature.

9. The air conditioning system according to claim 7, characterized in that, The controller is also configured to: When the compressor operating frequency is lower than the first preset frequency or when the coil temperature of the indoor heat exchanger is lower than the first preset temperature, the indoor fan is controlled to remain off. The compressor operating frequency is adjusted according to the return air temperature and the coil temperature to increase the coil temperature.

10. The air conditioning system according to claim 9, characterized in that, The step of adjusting the compressor operating frequency based on the return air temperature and the coil temperature includes: The ratio of the coil temperature to the return air temperature is used as an adjustment coefficient; Multiply the current compressor operating frequency by the adjustment coefficient to obtain the adjusted compressor operating frequency.

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