air conditioner

Abstract

The present application proposes an air conditioner, which includes an ambient temperature detection device for detecting the return air temperature and a coil temperature detection device for detecting the coil temperature. When the heat exchange temperature difference meets the preset compensation condition, it is judged that temperature stratification has occurred in the room and the measured indoor ambient temperature needs to be compensated. During the temperature compensation process, the angle compensation coefficient is determined according to the position of the air guide plate, and the wind speed compensation coefficient is determined according to the working gear of the indoor fan. The above compensation coefficient and the first temperature difference are subjected to a first logical operation to obtain a compensated temperature value, and the compensated indoor ambient temperature is obtained accordingly. The frequency of the compressor is adjusted according to the second temperature difference between the compensated indoor ambient temperature and the set temperature, and the compressor is turned off when the second temperature difference meets the preset shutdown range.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to an air conditioner. Background Art

[0002] Indoor units such as wall-mounted, ceiling-mounted, and split-pipe units are located at the top or upper part of the room. The indoor unit includes a return air vent and an air outlet connected to the room. An indoor ambient temperature sensor for detecting the temperature is provided at the return air vent, and the detected temperature and the set temperature are used to control the operation of the air conditioner's refrigeration system.

[0003] However, since the user's activity space height (head height when standing) is generally below 1.8 meters, located below the indoor unit's air outlet and return air vents, from a user comfort perspective, they generally prefer to keep their head cool and their feet warm during heating. However, in reality, during heating, the indoor heat exchanger is at a higher temperature, and the outlet air temperature after the indoor heat exchanger is at least the same as the return air temperature (i.e., the temperature detected by the indoor ambient temperature sensor), and generally reaches the upper limit of the indoor heat exchanger coil protection value (for example, if the indoor heat exchanger coil temperature protection value is 56°C, the outlet air temperature is generally around 56°C).

[0004] In heating mode, the higher the outlet air temperature, the lower the density and the greater the upward velocity. This can cause temperature stratification in the room along the vertical axis, with the upper part of the room warmer and the lower part cooler. This causes the lower part of the room to be higher than the return air temperature detected by the indoor ambient temperature sensor.

[0005] To solve this problem, temperature compensation is required. Related technologies have proposed using the angle of the air deflector and the internal unit's windshield for temperature compensation. However, because these technologies fail to consider the impact of the air conditioner's outlet temperature, when the air conditioner's outlet temperature is within a certain range, the temperature compensation effect of these technologies is significantly flawed.

[0006] In view of this, this application is filed. Summary of the Invention

[0007] The present application provides an air conditioner that couples three factors: the heat exchange temperature difference of the indoor heat exchanger (the difference between the return air temperature and the coil temperature), the working gear of the indoor fan, and the angle of the air guide plate to perform temperature compensation, so that the average temperature in the indoor user activity space is basically consistent with the set temperature, thereby improving the user's thermal comfort.

[0008] The present application provides an air conditioner comprising:

[0009] The indoor unit is located at the top or upper part of the room and includes a return air vent and an air outlet communicating with the room;

[0010] The refrigerant circulation loop circulates the refrigerant in the loop consisting of the compressor, condenser, expansion valve, and evaporator. One of the condenser and evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger.

[0011] An ambient temperature detection device is provided at the return air outlet to detect the return air temperature and define the return air temperature as the indoor ambient temperature to provide a base for subsequent temperature compensation;

[0012] The indoor fan is located near the indoor heat exchanger and is used to deliver the heat-exchanged air into the room;

[0013] An air deflector is provided at the air outlet, and adjusts the outflow direction of the air flowing through the air outlet by changing the relative rotation angle between the air deflector and the air outlet;

[0014] The coil temperature detection device is installed on the indoor heat exchanger to detect the coil temperature of the indoor heat exchanger and define the coil temperature as the air outlet temperature;

[0015] The controller is configured to: after receiving the first signal, when the heat exchange temperature difference between the outlet air temperature and the measured indoor ambient temperature meets a preset compensation condition, determine that the indoor temperature is stratified at this time, and perform temperature compensation on the measured indoor ambient temperature;

[0016] Determine the angle compensation coefficient according to the position or working status of the air deflector;

[0017] Determine the wind speed compensation coefficient according to the working gear of the indoor fan;

[0018] performing a first logical operation based on the heat exchange temperature difference, the angle compensation coefficient, and the wind speed compensation coefficient to obtain a compensated temperature value, and compensating the measured indoor ambient temperature accordingly to obtain a compensated indoor ambient temperature, wherein in the first logical operation, the compensated temperature value is proportional to the product of the heat exchange temperature difference and the wind speed compensation coefficient;

[0019] The frequency of the compressor is adjusted according to a second temperature difference between the compensated indoor ambient temperature and the set temperature, and the compressor is turned off when the second temperature difference meets a preset shutdown range.

[0020] In some embodiments of the present application, the controller is configured to calculate a new compensation temperature value when the working gear of the indoor motor and / or the angle of the air guide plate changes, and periodically increase or decrease the previous compensation temperature value to switch the compensation temperature value to the new compensation temperature value, thereby adjusting the compensated indoor ambient temperature so that the change range of the indoor ambient temperature is within a third temperature range.

[0021] In some embodiments of the present application, the controller is configured to: upon receiving the first signal, adjust the operating frequency of the compressor so that the compensated indoor ambient temperature gradually approaches or exceeds the set temperature, and control the compressor to shut down when a second temperature difference between the compensated indoor ambient temperature and the set temperature meets a lower limit of a preset shutdown range;

[0022] Before the compressor stops, the working gear of the indoor fan and the angle of the air guide plate remain unchanged in the current working state.

[0023] By reducing the frequency of the compressor, the coil temperature will decrease, and the buoyancy of the outlet air flow will decrease, resulting in a decrease in the return air temperature. Therefore, the actual indoor ambient temperature remains unchanged or changes very little, reducing the probability of self-excited oscillation of the air in the indoor space.

[0024] In some embodiments of the present application, the controller is configured to continue temperature compensation according to the compensation temperature value before the compressor is stopped during the compressor stop period after the second temperature difference satisfies the preset shutdown range.

[0025] In some embodiments of the present application, the controller is configured to: during the shutdown period of the compressor, when the shutdown time of the compressor reaches a certain time and the compressor is still not started, adjust the indoor ambient temperature to offset the first set temperature downward;

[0026] Thereafter, the compensated indoor ambient temperature is biased downward once at a certain interval until the compressor is started again, wherein each interval time is the same or different, and each downward biased temperature is the same or different.

[0027] In some embodiments of the present application, the controller is configured to: when the working gear of the indoor fan remains unchanged and two consecutive changes in the indoor ambient temperature are within a first temperature range, the compressor operates at a certain frequency;

[0028] Get the heat exchange temperature difference T of the previous detection cycle d (0);

[0029] Detect the return air temperature and coil temperature at a certain detection interval to obtain the corresponding heat exchange temperature difference. When the above heat exchange temperature difference and T d When the difference between (0) and (1) reaches the preset threshold, it is determined that the heat exchange temperature difference changes greatly at this time, and the acquisition time of the heat exchange temperature difference that meets the conditions and T c The difference between the acquisition moments of (0) is defined as the variable detection period, and the new compensation temperature value is calculated;

[0030] The heat transfer temperature difference that meets the conditions is taken as the new T d (0);

[0031] The above detection intervals are the same or different.

[0032] In some embodiments of the present application, the indoor fan is provided with multiple gears, and a range value of the wind speed compensation coefficient is set. The highest gear of the indoor fan is set to correspond to the upper limit value of the above range value, and the lowest gear of the indoor fan is set to correspond to the lower limit value of the above range value. The other gears of the indoor fan are determined by interpolation method to determine the corresponding wind speed compensation coefficient.

[0033] In some embodiments of the present application, the controller is configured to control the compressor to shut down when the second temperature difference between the compensated indoor ambient temperature and the set temperature meets the lower limit of the preset shutdown range;

[0034] When the compressor is stopped, the indoor fan operates at a certain speed, and the air guide plate rotates to prevent the air blown out of the air outlet from blowing towards the user activity area.

[0035] The present application also provides another air conditioner, including:

[0036] The indoor unit is located at the top or upper part of the room and includes a return air vent and an air outlet communicating with the room;

[0037] The refrigerant circulation loop circulates the refrigerant in the loop consisting of the compressor, condenser, expansion valve, and evaporator. One of the condenser and evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger.

[0038] An ambient temperature detection device is provided at the return air outlet to detect the return air temperature and define the return air temperature as the indoor ambient temperature to provide a base for subsequent temperature compensation;

[0039] The indoor fan is located near the indoor heat exchanger and is used to deliver the heat-exchanged air into the room;

[0040] The coil temperature detection device is installed on the indoor heat exchanger to detect the coil temperature of the indoor heat exchanger and define the coil temperature as the air outlet temperature;

[0041] The controller is configured to: after receiving the first signal, determine that the indoor temperature is stratified when the heat exchange temperature difference between the outlet air temperature and the measured indoor ambient temperature meets a preset compensation condition;

[0042] Determine the wind speed compensation coefficient according to the working gear of the indoor fan;

[0043] performing a second logical operation based on the heat exchange temperature difference and the wind speed compensation coefficient to obtain a compensated temperature value, and compensating the measured indoor ambient temperature accordingly to obtain a compensated indoor ambient temperature, wherein in the second logical operation, the compensated temperature value is proportional to the product of the heat exchange temperature difference and the wind speed compensation coefficient;

[0044] The frequency of the compressor is adjusted according to a second temperature difference between the compensated indoor ambient temperature and the set temperature, and the compressor is turned off when the second temperature difference meets a preset shutdown range.

[0045] In some embodiments of the present application, the controller is configured to continue temperature compensation according to the compensation temperature value before the compressor is stopped during the compressor stop period after the second temperature difference satisfies the preset shutdown range.

[0046] In the above embodiments, the present application proposes an air conditioner, which includes a coil temperature detection device arranged on the indoor heat exchanger and an ambient temperature detection device arranged at the return air outlet of the indoor unit. The coil temperature detection device is used to detect the coil temperature of the indoor heat exchanger, and define the coil temperature as the outlet air temperature, and perform temperature compensation based on this. The ambient temperature detection device is used to detect the return air temperature, and define the return air temperature as the measured indoor ambient temperature to provide a base for subsequent temperature compensation. The controller is configured to, when the heat exchange temperature difference between the outlet air temperature and the measured indoor ambient temperature meets the preset compensation condition, determine that temperature stratification has occurred indoors at this time, and the tested indoor ambient temperature needs to be compensated to accurately control the operation of the compressor.

[0047] During the temperature compensation process, an angle compensation coefficient is determined based on the position or operating state of the air guide plate, and a wind speed compensation coefficient is determined based on the operating gear of the indoor fan. A first logical operation is performed on the heat exchange temperature difference, the angle compensation coefficient, and the wind speed compensation coefficient to obtain a compensated temperature value. This temperature value is then used to compensate for the measured indoor ambient temperature detected by the ambient temperature detection device to obtain a compensated indoor ambient temperature, which is used to adjust the operation of subsequent air conditioning components. The frequency of the compressor is adjusted based on a second temperature difference between the compensated indoor ambient temperature and the set temperature, and the compressor is shut down when the second temperature difference meets a preset shutdown range. When the air conditioner determines that temperature stratification has occurred indoors, it determines a corresponding compensation coefficient based on the outlet air temperature, the position of the air guide plate, and the operating gear of the indoor fan, and accordingly obtains a compensated temperature value to obtain a compensated indoor ambient temperature, thereby ensuring that the average temperature within the indoor user activity space is substantially consistent with the set temperature, thereby improving the user's thermal comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0049] Figure 1 is a structural diagram of an air conditioner provided according to an exemplary embodiment;

[0050] Figure 2 A hardware configuration block diagram of a controller provided according to an exemplary embodiment;

[0051] Figure 3 is a control logic for temperature compensation according to an exemplary embodiment;

[0052] Figure 4 is a density variation diagram of dry air according to an exemplary embodiment;

[0053] Figure 5 is a temperature field cloud diagram when the indoor fan is at the second gear and the air guide plate is at the second angle under the low coil temperature according to an exemplary embodiment;

[0054] Figure 6 is a temperature field cloud diagram when the indoor fan is at the first gear and the air guide plate is at the first angle at a low coil temperature according to an exemplary embodiment;

[0055] Figure 7 is a temperature field cloud diagram when the indoor fan is at the first gear and the air guide plate is at the second angle at a low coil temperature according to an exemplary embodiment;

[0056] Figure 8 is a temperature field cloud diagram when the indoor fan is at the second gear and the air guide plate is at the second angle under the high coil temperature according to an exemplary embodiment;

[0057] Figure 9 is a temperature field cloud diagram when the indoor fan is at the first gear and the air guide plate is at the first angle under high coil temperature according to an exemplary embodiment;

[0058] Figure 10 is a temperature field cloud diagram when the indoor fan is at the first gear and the air guide plate is at the second angle under high coil temperature according to an exemplary embodiment;

[0059] Figure 11 A composite diagram of the rising speed of hot air, the outlet speed, and the outlet angle caused by buoyancy according to an exemplary embodiment;

[0060] Figure 12 Schematic diagram of air flow at different operating levels of the indoor fan and different air outlet angles of the air guide plate under a certain coil temperature in an exemplary embodiment;

[0061] Figure 13 According to an exemplary embodiment Figure 12 Schematic diagram of air flow at different operating levels of the indoor fan and different air outlet angles of the air guide plate at the same coil temperature;

[0062] Figure 14 According to an exemplary embodiment Figure 12Schematic diagram of air flow at different operating levels of the indoor fan and different air outlet angles of the air guide plate at the same coil temperature;

[0063] Figure 15 FIG. 1 is a schematic diagram of a compensation temperature approximation for gear shifting according to an exemplary embodiment;

[0064] Figure 16 Schematic diagram of return air temperature and room temperature changes during temperature reaching period in heating mode according to an exemplary embodiment;

[0065] Figure 17 is a control logic in a heating mode according to an exemplary embodiment;

[0066] Figure 18 is the control logic during a temperature shutdown according to an exemplary embodiment;

[0067] Figure 19 is a hardware configuration diagram of an air conditioner according to an exemplary embodiment;

[0068] Figure 20 is a fitting function diagram of the working gear of the indoor fan and the wind speed compensation coefficient when the gear is 4 according to an exemplary embodiment;

[0069] In the above figures:

[0070] Air conditioner 100; air guide plate 2; coil temperature detection device 3; indoor unit 11; air outlet 12; return air outlet 13;

[0071] Outdoor unit 14; control device 200; ambient temperature detection device 4; indoor fan 5;

[0072] Compressor 1 ; controller 71 ; processor 83 ; memory 82 ; communication interface 84 ; bus 81 . DETAILED DESCRIPTION

[0073] The present invention is described in detail below by way of exemplary embodiments, but it should be understood that elements, structures, and features of one embodiment may be beneficially combined in other embodiments without further description.

[0074] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0075] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0076] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections via an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0077] The embodiment of the present application provides an air conditioner 100, referring to Figure 1 The air conditioner 100 includes a refrigeration system for exchanging heat with indoor air to meet cooling or heating needs.

[0078] The refrigeration system includes a compressor 1, a condenser, an expansion valve, and an evaporator. In this application, the air conditioner 100 performs a refrigeration cycle of the air conditioner 100 by using the compressor 1, the condenser, the expansion valve, and the evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air.

[0079] Compressor 1 compresses high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, releasing heat into the surrounding environment through the condensation process.

[0080] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor 1.

[0081] The evaporator can achieve a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioner 100 can adjust the temperature of the indoor space.

[0082] The outdoor unit of the air conditioner 100 refers to a portion of a refrigeration cycle including the compressor 1 and an outdoor heat exchanger, the indoor unit of the air conditioner 100 includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

[0083] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner 100 functions as a heater in a heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner 100 functions as a cooler in a cooling mode.

[0084] The air conditioner 100 in this application includes an indoor unit 11 and an outdoor unit 14. The indoor unit 11 and the outdoor unit 14 can be configured as an integrated unit or a split unit. The indoor unit 11 can be configured as a wall-mounted unit, a ceiling unit, a duct unit, etc., and the indoor unit 11 is installed at the top or top of the indoor room.

[0085] Reference Figure 1 Taking an indoor hanging machine as an example, an indoor hanging machine is usually installed at a location such as an indoor wall. For another example, an indoor cabinet machine (not shown in the figure) is also a form of the indoor machine 11.

[0086] Taking a split unit as an example, the air conditioner 100 includes an indoor unit 11 and an outdoor unit 14, wherein the outdoor unit 14 is usually set outdoors for heat exchange with the indoor environment.

[0087] As shown in the figure, the air conditioner 100 includes a controller 71 for controlling the operation of various components within the air conditioner 100, thereby enabling the various components of the air conditioner 100 to operate and achieve the various predetermined functions of the air conditioner 100. The air conditioner 100 also includes a control device 200. For example, the control device 200 is configured as a remote control that communicates with the controller 71 using, for example, infrared or other communication methods. The remote control allows the user to control various aspects of the air conditioner 100 and enables interaction between the user and the air conditioner 100.

[0088] The indoor unit 11 of the air conditioner 100 in the embodiment of the present application is arranged at the top or upper part of the room. Generally speaking, the installation height of the indoor unit 11 is higher than the user activity area. The indoor unit 11 includes a return air inlet 13 and an air outlet 12 connected to the room. The indoor air passes through the return air inlet 13 inside the indoor unit 11 and flows back into the room through the air outlet 12.

[0089] The refrigerant circulation loop in this application circulates the refrigerant through a loop consisting of a compressor 1, a condenser, an expansion valve, and an evaporator. One of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger. The indoor heat exchanger is used to exchange heat with the air in the indoor unit 11, and the outdoor unit 14 heat exchanger is used to exchange heat with the air in the outdoor unit 14, thereby achieving the cooling or heating requirements of the air conditioner 100.

[0090] The indoor unit 11 also includes an indoor fan 5, which is arranged at the indoor heat exchanger near the return air port 13 or the air outlet 12, and is used to deliver the heat-exchanged air into the room. The indoor fan 5 includes multiple gears for changing the outlet air flow speed of the air outlet 12.

[0091] An air guide plate 2 is provided at the position of the air outlet 12. The air guide plate 2 adjusts the outflow direction of the air flowing through the air outlet 12 by changing the relative rotation angle between the air guide plate 2 and the air outlet 12, thereby affecting the indoor air temperature stratification.

[0092] In the embodiment shown in this application, the air conditioner 100 further includes a controller 71. Controller 71 is a device that generates an operation control signal based on an instruction opcode and a timing signal, thereby instructing the air conditioner 100 to execute the control instruction. For example, in response to a power-on or power-off instruction received from a user, controller 71 may execute an operation related to the object selected by the power-on or power-off instruction.

[0093] The embodiment of the present application also provides a hardware structure diagram of a controller 71, such as Figure 2 As shown, the controller 71 includes a processor 83 and, optionally, a memory 82 and a communication interface 84 connected to the processor 83. The processor 83, the memory 82 and the communication interface 84 are connected via a bus 81.

[0094] The processor 83 may be a central processing unit (CPU), a general-purpose processor (GP3), a network processor (NP), a digital signal processor (DSP), a microprocessor (MCU), a microcontroller (MCU), a programmable logic device (PLD), or any combination thereof. The processor 83 may also be any other device having processing functionality, such as a circuit, a device, or a software module. The processor 83 may also include multiple CPUs, and the processor 83 may be a single-CPU processor or a multi-CPU processor. The processor 83 herein may refer to one or more devices, circuits, or processing cores for processing data (e.g., computer program instructions).

[0095] The memory 82 may be a read-only memory 82 (ROM) or other type of static storage device that can store static information and instructions, a random access memory 82 (RAM) or other type of dynamic storage device that can store information and instructions, or an electrically erasable programmable read-only memory 82 (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer. The present embodiment of the application does not impose any restrictions on this. The memory 82 may exist independently or be integrated with the processor 83. The memory 82 may contain computer program code. The processor 83 is used to execute the computer program code stored in the memory 82, thereby implementing the control method of the multi-split air conditioner 100100 system provided in the embodiment of the application.

[0096] The communication interface 84 can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area network (WLAN), etc.). The communication interface 84 can be a module, a circuit, a transceiver or any device that can achieve communication.

[0097] The bus 81 may be a peripheral component interconnect (PCI) bus 81 or an extended industry standard architecture (EISA) bus 81. The bus 81 may be divided into an address bus 81, a data bus 81, a control bus 81, etc. For ease of representation, Figure 11 Only one thick line is used in the figure, but it does not mean that there is only one bus 81 or one type of bus 81.

[0098] In some implementations of this embodiment, the air conditioner 100 further includes an ambient temperature detection device 4, which is disposed at the return air outlet 13 and is used to detect the return air temperature T 回 , and define the return air temperature T 回To measure the indoor ambient temperature and provide a basis for subsequent temperature compensation. The ambient temperature detection device 4 is electrically connected to the controller 71, and the ambient temperature detection device 4 detects the return air temperature T 回 And the return air temperature T 回 Sent to controller 71.

[0099] In some implementations of this embodiment, the air conditioner 100 further includes a coil temperature detection device 3 , which is mounted on the indoor heat exchanger. Specifically, the coil temperature detection device 3 can be installed on the side of the indoor heat exchanger near the air outlet. The coil temperature detection device 3 is used to detect the coil temperature of the indoor heat exchanger and define it as the outlet air temperature, so that the controller 71 can use the outlet air temperature for temperature compensation. The coil temperature detection device 3 is electrically connected to the controller 71 and detects the coil temperature and transmits the coil temperature to the controller 71.

[0100] Exemplarily, the ambient temperature detection device and the coil temperature detection device can be configured as temperature sensors, which detect the temperature value of a certain position at a certain moment and send the detected temperature value to the controller.

[0101] In heating mode, the density of dry air decreases as the temperature increases, as shown in Table 1 and Figure 4 As shown in Table 1, the density of dry air at 55°C is only 89.3% of that at 20°C. Therefore, the higher the heating outlet air temperature, the higher the upward velocity of the hot air. This leads to more pronounced temperature stratification in the vertical direction and a greater temperature deviation (the difference between the set temperature and the average temperature of effective indoor measurement points), significantly affecting the thermal adaptability of the air conditioner 100. As shown in Table 1, the smaller the difference between the outlet and return air temperatures, the smaller the spatial density difference and the lower the air buoyancy.

[0102] Table 1

[0103]

[0104] The direction and velocity of the airflow from the air outlet 12 of the air conditioner 100 can also lead to temperature stratification. This is explained below using an example where the indoor fan 5 has a first gear and a second gear, and the angle of the air guide plate 2 has a first angle and a second angle. The first gear is higher than the second gear, and the first angle is greater than the second angle. The aforementioned angle refers to the angle between the air guide plate 2 and the vertical direction of the bottom surface.

[0105] Reference Figure 5-7 , Figure 5-7 The temperature field cloud diagrams for different angles of the air guide plate 2 and different gears of the indoor fan 5 under low heat exchange temperature difference are shown in the figure. Specifically, Figure 5 The corresponding figure is the temperature field cloud diagram when the indoor fan 5 is in the second gear and the air guide plate 2 is at the second angle under low heat exchange temperature difference. Figure 6 The corresponding Figure 5 Under the same heat exchange temperature difference, the temperature field cloud diagram when the indoor fan 5 is in the first gear and the air guide plate 2 is at the first angle is shown. Figure 7 The corresponding Figure 5 Temperature field cloud diagram when the indoor fan 5 is in the first gear and the air guide plate 2 is at the second angle under the same heat exchange temperature difference.

[0106] Reference Figure 8-10 , Figure 8-19 The temperature field cloud diagram is shown for different angles of the air guide plate 2 and different gears of the indoor fan 5 under high heat exchange temperature difference. It should be noted that high heat exchange temperature difference is higher than low heat exchange temperature difference. Specifically, Figure 8 The corresponding temperature field cloud diagram is the temperature field cloud diagram under high heat exchange temperature difference, when the indoor fan 5 is in the second gear and the air guide plate 2 is at the second angle. Figure 9 The corresponding Figure 8 Under the same heat exchange temperature difference, the indoor fan 5 is in the first gear, and the air guide plate 2 is at the first angle. Figure 10 The corresponding Figure 8 Temperature field cloud diagram with the indoor fan 5 at the first gear and the air guide plate 2 at the second angle under the same heat exchange temperature difference.

[0107] It can be seen from the above temperature field cloud map that when the wind speed and angle of the outlet air flow are the same, the higher the heat exchange temperature difference, the more obvious the temperature stratification. When the heat exchange temperature difference is low, the indoor fan 5 is also in the first gear, and the angle of the air guide plate 2 is different, the temperature stratification difference is not obvious; when the heat exchange temperature difference is high, when the indoor fan 5 is in the first gear, the temperature stratification difference is obvious when the angle of the air guide plate 2 is different.

[0108] Based on the above analysis, the factors affecting temperature stratification are mainly the difference between the outlet air temperature and the return air temperature - the heat exchange temperature difference, the wind speed of the outlet air flow, and the outlet angle of the outlet air flow, which are strongly correlated. This provides theoretical support for the technical rationality of this application.

[0109] In addition, when the air conditioner 100 is running in heating mode, when the wind speed switches from the first gear to the second gear, the heat exchange temperature difference will also increase, and the dual factors of coupling and superposition (wind speed decreases, floating speed increases) will make the temperature stratification more obvious. Figure 11 This is a composite diagram (vector diagram) of the rising speed of hot air caused by buoyancy, the outlet speed, and the outlet angle. It can be seen that different rising speeds, outlet speeds, and initial angles will change the airflow speed and direction after synthesis.

[0110] Figure 12-14 is the vector diagram of continuous airflow, Figure 12-14 Schematic diagram of the air flow when the indoor fan 5 has different working gears and the air outlet angle of the air guide plate 2 is different under the same heat exchange temperature difference. Figure 12The figure shows the air flow when the indoor fan 5 is in the second gear and the angle of the air guide plate 2 is 30 degrees. Figure 13 The figure shows the air flow when the indoor fan 5 is in the second gear and the angle of the air guide plate 2 is 45 degrees. Figure 14 The figure shows the air flow when the indoor fan 5 is in the first gear and the angle of the air guide plate 2 is 45 degrees.

[0111] It can be seen that when the buoyancy is large (the heat exchange temperature difference is high), the wind speed is low, and the angle between the initial airflow angle and the horizontal plane is small, Figure 12 As shown, an upward arc airflow is formed, and Figure 8 The situation reflected by the temperature field cloud map is consistent.

[0112] Figure 12 and Figure 13 In the figure, only the angle of the air guide plate 2 is inconsistent, but an upward arc airflow is formed. However, due to the different angles of the air guide plate 2, the trajectory of the arc airflow is different. Figure 13 and Figure 14 The gears of the indoor fan 5 are different. Figure 14 Indoor fan 5-speed ratio Figure 13 The gear position of the middle indoor fan 5 is high, so the air flow is faster, which affects the flow direction of the air flow.

[0113] In order to compensate for the effect of temperature stratification on thermal adaptability caused by the rising of hot air, in some implementations of this embodiment, the controller 71 is configured to, after receiving the first signal, obtain the difference between the outlet air temperature and the measured indoor ambient temperature, and define the difference as a heat exchange temperature difference. When the heat exchange temperature difference meets a preset compensation condition, it is determined that the indoor temperature is stratified at this time, and the measured indoor ambient temperature cannot well represent the average indoor temperature at this time, and temperature compensation needs to be performed on the measured indoor ambient temperature.

[0114] It should be noted that, after receiving the first signal, the controller controls the air conditioner to operate in heating mode. In heating mode, indoor air enters the indoor unit, exchanges heat with the indoor heat exchanger, and then flows out, thereby increasing the indoor ambient temperature.

[0115] First, the angle compensation coefficient is determined according to the position or working status of the air guide plate 2, and the wind speed compensation coefficient is determined according to the working gear of the indoor fan 5. Then, a first logical operation is performed based on the determined heat exchange temperature difference, the angle compensation coefficient and the wind speed compensation coefficient to obtain a compensated temperature value, and the measured indoor ambient temperature is compensated accordingly to obtain a compensated indoor ambient temperature. The compensated indoor ambient temperature can better reflect the average indoor temperature than the simply measured indoor ambient temperature. Among them, in the second logical operation, the compensated temperature value is proportional to the product of the heat exchange temperature difference and the wind speed compensation coefficient.

[0116] Then, the frequency of the compressor 1 is adjusted according to the second temperature difference between the compensated indoor ambient temperature and the set temperature, and the compressor 1 is turned off when the second temperature difference meets the preset shutdown range.

[0117] In some embodiments, the preset compensation condition can be set to a heat exchange temperature difference between the outlet air temperature and the return air temperature within a set range value [Tdmin, Tdmax], where Tdmin is a temperature limit setting based on room stratification. When the heat exchange temperature difference is less than 0°C, that is, the outlet air temperature is equal to the return air temperature, which is equivalent to no heating capacity and no indoor room temperature stratification. For example, Tdmin can be set to 0°C, and Tdmax is based on the reliability and refrigeration performance constraints of the refrigeration system. For example, Tdmax can be set to 40°C.

[0118] The purpose of setting the preset compensation condition in this embodiment is to predict the buoyancy of the outlet air flow by judging the difference between the outlet air temperature and the return air temperature, and then to judge whether the indoor air is temperature stratified, and thus to judge whether temperature compensation is needed.

[0119] In this embodiment, the effect of the angle of the air deflector 2 on temperature compensation is converted into a conversion angle compensation coefficient, expressed in degrees Celsius. This conversion angle compensation coefficient is related to the specific air duct structure and air supply flow structure of the indoor unit 11. Table 4 below illustrates the conversion angle compensation coefficient K_Angle at different angles.

[0120] Table 4

[0121] Lateral air guide plate 2 air door position T_Angle(℃) Position 5, Position 6 1 Position 3, Position 4, Sweep 0 Position 1, Position 2, Automatic -0.5

[0122] It should be noted that position 1, position 2, position 3, position 4, position 5, and position 6 are arranged from bottom to top along the height direction.

[0123] In some implementations of this embodiment, the indoor fan 5 is provided with multiple gears, and a range value of the wind speed compensation coefficient is set. The highest gear of the indoor fan 5 corresponds to the upper limit value of the above range value, and the lowest gear of the indoor fan 5 corresponds to the lower limit value of the above range value. The other gears of the indoor fan 5 are determined by interpolation method to determine the corresponding wind speed compensation coefficient.

[0124] The effect of the indoor motor's gear position on temperature compensation is converted into the wind speed compensation coefficient K_Fan, which has no units. Rn is the highest gear, and R1 is the lowest gear. Generally, n is between 3 and 7. When n = 3, the indoor motor has three gear positions: R3, R2, and R1. When n = 7, the indoor motor has three gear positions: R7, ..., and R1.

[0125] The wind speed compensation coefficient K_Fan for Rn gear and R1 gear is K_Fan-H and K_Fan-L respectively, where 0<K_Fan-H<K_Fan-L. The wind speed compensation coefficient K_Fan for other gears is obtained by interpolation.

[0126] Reference Figure 20 , shown is the fitting function diagram of the working gear of the indoor fan and the wind speed compensation coefficient when the gear is 4. It can be seen that it is a quadratic function (K_Fan=0.015n 2 = -0.135n+0.36_). Since the computing power of the air conditioner controller is weak in some scenarios (for example, the controller is set to a single-chip microcomputer), it is almost impossible to calculate the quadratic function. Therefore, in practical applications, the wind speed compensation coefficient can be obtained by looking up a table.

[0127] For example, when n=3, the wind speed compensation coefficient K_Fan for the R2 gear is (K_Fan-H+K_Fan-L) / 2 according to the interpolation method.

[0128] If K_Fan-H = 0.06, K_Fan-L = 0.24, and n = 4, 5, or 7, the wind speed compensation coefficient for each specific gear is shown in Table 2 below (the data in the table is for example only). The values ​​of K_Fan-H and K_Fan-L are related to the actual speed of the specific gear of indoor fan 5 and can be adjusted according to the specific application scenario.

[0129] Table 2

[0130]

[0131] In some implementations of this embodiment, the first operation logic may be set to:

[0132] T 补 =K_Fan*Td+K_Angle

[0133] Among them, T 补 is the compensation temperature value, K_Fan is the wind speed compensation coefficient, Td is the heat exchange temperature difference, and K_Angle is the angle compensation coefficient.

[0134] From the above, it can be seen that the relationship between the heat exchange temperature difference and the wind speed compensation coefficient in temperature compensation is a product relationship, and the influence of the conversion angle compensation coefficient on temperature compensation is an addition and subtraction relationship. As any parameter among the heat exchange temperature difference, working gear, and the angle of the air guide plate 2 changes, the compensation temperature value changes dynamically. Accordingly, the calculated compensation indoor environment temperature (Ta=T 回 -T 补 ) also changes dynamically.

[0135] Through the setting of the above-mentioned first operation logic, the correlation between the working gear of the indoor fan 5 and the heat exchange temperature difference is fully considered. The coupling between the two strengthens the temperature compensation. At the same time, the angle compensation coefficient is used to further perform temperature compensation, so that the average temperature in the indoor user activity space is basically consistent with the set temperature, effectively improving the user's thermal comfort.

[0136] Reference Figure 3 , illustrating the control logic for temperature compensation in the embodiment of the present application.

[0137] Measuring the outlet air temperature and the return air temperature (step S301);

[0138] Determine whether the heat exchange temperature difference between the outlet air temperature and the return air temperature meets the preset compensation condition (step S302);

[0139] In step S302, if the heat exchange temperature difference meets the preset compensation condition, step S303 is executed to start temperature compensation; the angular position of the air guide plate 2 and the working gear of the indoor fan 5 are obtained (step S305);

[0140] Determine an angle compensation coefficient according to the angular position of the air deflector 2 (step S307);

[0141] Determine the wind speed compensation coefficient according to the working gear of the indoor fan 5 (step S308);

[0142] Performing a first logical operation based on the heat exchange temperature difference, the angle compensation coefficient, and the wind speed compensation coefficient to obtain a compensation temperature value (step S309);

[0143] Compensating and measuring the indoor ambient temperature, and obtaining the compensated indoor ambient temperature (step S310);

[0144] Adjusting the frequency of the compressor 1 according to the second temperature difference between the compensated indoor ambient temperature and the set temperature (step S311);

[0145] Determining whether the second temperature difference satisfies a preset shutdown range (step S312);

[0146] In step S312, if the second temperature difference satisfies the preset shutdown range, step S313 is executed to shut down the compressor 1;

[0147] In step S312, if the second temperature difference does not meet the preset shutdown range, step S311 is executed;

[0148] In step S302, if the heat exchange temperature difference does not meet the preset compensation condition, step S304 is executed and no temperature compensation is performed;

[0149] It can be seen that the order of obtaining the angular position of the air guide plate 2 and the working gear of the indoor fan 5 is not particular, and the calculation of the three compensation coefficients is also not particular, and flexible judgment is made based on the actual data acquisition or hardware processing capabilities.

[0150] In some embodiments, a position sensor or an angle sensor may be provided to obtain the tilt angle of the air deflector 2 so as to obtain the flip angle position of the air deflector 2 .

[0151] In this embodiment, by using the difference between the return air temperature and the outlet air temperature to perform temperature compensation calculation, there is no need to correct a single temperature detection value. Temperature compensation can be performed more accurately and the operation of the air conditioner 100 can be guided, thereby effectively improving the user's thermal comfort and enhancing the user's usage experience.

[0152] In some implementations of this embodiment, the controller 71 is configured to, when the working gear of the indoor fan 5 remains unchanged and the changes in the indoor ambient temperature for two consecutive times are within the first temperature range, determine that the indoor ambient temperature is stable at this time, and the compressor 1 operates at a certain frequency at this time; it can be known that when the changes in the indoor ambient temperature for two consecutive times are within the first temperature range, it is determined that the indoor ambient temperature is in a relatively stable state at this time.

[0153] First, obtain the heat exchange temperature difference T of the previous detection cycle d (0);

[0154] Then, the return air temperature and the coil temperature are detected at a certain detection interval to obtain the corresponding heat exchange temperature difference. When the heat exchange temperature difference and T d When the difference between (0) and (1) reaches the preset threshold, it is determined that the heat exchange temperature difference changes greatly at this time, and the acquisition time of the heat exchange temperature difference that meets the conditions and T d The difference between the acquisition moments of (0) is defined as the variable detection period, and the new compensation temperature value is calculated;

[0155] The heat transfer temperature difference that meets the conditions is taken as the new T d (0);

[0156] The above detection intervals are the same or different.

[0157] In some embodiments, detection may be performed first at a fixed period, and then at a certain set interval. Generally speaking, the fixed period is greater than the set interval, and the fixed period and the set interval constitute a variable detection period.

[0158] The purpose of the above setting is to avoid temperature compensation caused by small fluctuations in the detected heat exchange temperature difference when the air conditioner 100 is already running smoothly, thereby effectively avoiding sudden changes in room temperature and affecting user experience.

[0159] When the working gear of the indoor fan remains unchanged, the room temperature has stabilized and the compressor 1 operates at a low frequency. In order to prevent the indoor heat exchange temperature difference Td from changing slightly, causing the temperature compensation value T 补 Changes will continue to cause the room temperature Ta to change, which in turn causes the set temperature difference E (E = Ts-Ta) to change, so that the frequency F of the compressor 1 changes, which will cause the coil temperature Tc of the indoor heat exchanger to change, and the heat exchange temperature difference of the indoor heat exchanger to change, forming Td->T 补 ->Ta->E->F->Tc->Td closed cycle, that is, there is a self-excited oscillation phenomenon, which eventually causes room temperature fluctuations. In this embodiment, by setting temperature difference judgment rules and variable periods, the fluctuation action in the above closed cycle is reduced and the stability of the indoor ambient temperature is improved.

[0160] It should be noted that the detection cycle includes a basic cycle T2 and a variable cycle Tx. The value of the variable cycle is determined according to a preset judgment rule. By setting the basic cycle T2 and the variable cycle Tx, when the heat exchange temperature difference after the basic cycle T2 is significantly different from the previous cycle, a new compensation temperature value is calculated based on the new heat exchange temperature difference.

[0161] In addition, the new variable period can be expressed as Tx=T2+T3, where T3 is the variable time.

[0162] When the heat exchange temperature difference of the indoor heat exchanger in adjacent variable cycles changes significantly compared with the previous cycle, a new compensation temperature value is calculated according to the new heat exchange temperature difference of the indoor heat exchanger to eliminate the self-oscillation phenomenon in the room.

[0163] The above technical solution can be understood as that in adjacent detection cycles, if the heat exchange temperature difference changes slightly, no new temperature compensation is performed, and a new compensation value is only performed when the new heat exchange temperature difference changes significantly compared with the previous cycle.

[0164] Specifically:

[0165] Take T2 as the basic detection cycle. The first heat exchange temperature difference detected in each cycle is recorded as Td(0), and the compensation value of this cycle is calculated. From T2min, obtain the heat exchange temperature difference once, and then record the heat exchange temperature difference Td of the air conditioner every t2min, respectively, and record it as Td(T2+0), Td(T2+1), ..., Td(T2+j), where j is a natural number ≥0; until |Td(T2+j)-Td(0)| ≥ ΔTd, where ΔTd is the set threshold, then substitute Td(T2+j) into Tables 2, 3, and 4 to calculate and execute the new compensation temperature value.

[0166] In the new detection cycle, Td(T2+j) recorded in the previous cycle is recorded as the new Td(0). Starting from T2min, the heat exchange temperature difference of the indoor heat exchanger is detected once. Thereafter, the heat exchange temperature difference of the indoor heat exchanger is recorded once every t2min, and recorded as Td(T2+0), Td(T2+1), ..., Td(T2+j), where j is a natural number ≥0; if |Td(T2+j)-Td(0)|≥ΔTd, then Td(T2+j) is substituted into Table 1 to calculate and execute the new compensation temperature value.

[0167] At this time, the actual variable period Tx=T2+j*t2. The value range of T2 is 1 minute to 60 minutes, and the value range of t2 is 0.5 minutes to 20 minutes.

[0168] In some embodiments of this embodiment, the controller 71 is configured to calculate a new compensation temperature value when the working gear of the indoor fan 5 and / or the angle of the air guide plate 2 changes, and periodically increase or decrease the compensation temperature value according to the new compensation temperature value to switch the compensation temperature value to the new compensation temperature value, thereby adjusting the compensated indoor ambient temperature so that the change range of the indoor ambient temperature is within the third temperature range.

[0169] It can be known that the third temperature range is the temperature variation range that can be allowed in adjacent cycles during the temperature adjustment process to avoid sudden temperature changes that affect the user experience.

[0170] Specifically, since the working gear of the indoor motor and / or the angle of the air guide plate 2 changes, the influence on the temperature stratification is not immediately apparent, but a gradual process. Therefore, when the indoor motor gear and / or the angle change of the air guide plate 2 is detected, a new compensation temperature value is calculated. It cannot be switched to the new compensation value immediately, but needs to be switched to the new compensation value in the form of gradual approximation. Figure 15 .

[0171] In this embodiment, the compensation temperature value is gradually changed by periodically increasing or decreasing, and finally switched to a new compensation temperature value, which effectively prevents sudden changes in the indoor room temperature, resulting in a large change in the frequency of the compressor 1, and thus causing large fluctuations in the actual room temperature.

[0172] For example, if the current compensation temperature value is 2°C and the new compensation value is 4°C, and the periodic increment rule is set to 0.5°C / 2 minutes, then 2 minutes after the start of adjustment, the compensation temperature value is adjusted to 2.5°C. 4 minutes later, the compensation temperature value is 3°C, 6 minutes later, the compensation temperature value is 3.5°C, and 8 minutes later, the compensation temperature value is 4°C. In other words, after 8 minutes, the compensation temperature value is finally switched to the latest compensation temperature value. The parameter form is shown in Table 5. A1 and period T1 are the design parameter values. A1 ranges from 0.1°C to 1.0°C, and period T1 ranges from 1 second to 20 minutes.

[0173] Table 5

[0174] <![CDATA[T 补 (n+1)-T 补 (n)]]> Compensated temperature approximation rate of change ＞0℃ A1℃ / cycle T1 increases ＝0℃ 0 ＜0℃ A1℃ / cycle T1 decreases

[0175] In some implementations of this embodiment, the controller 71 is configured to: upon receiving the first signal, adjust the operating frequency of the compressor 1 so that the compensated indoor ambient temperature gradually approaches or exceeds the set temperature, and control the compressor 1 to shut down when a second temperature difference between the compensated indoor ambient temperature and the set temperature meets a lower limit of a preset shutdown range;

[0176] Before the compressor 1 stops, the working gear of the indoor fan 5 and the angle of the air guide plate 2 remain unchanged;

[0177] When the compressor 1 is stopped, the indoor fan 5 operates at a certain speed, and the air guide plate 2 rotates to prevent the air blown out of the air outlet 12 from blowing towards the user activity area, so that the indoor ambient temperature can reach the set temperature more smoothly, achieving temperature-reaching shutdown.

[0178] It should be noted that, during the operation of the compressor 1 , the overall trend of the operating frequency of the compressor 1 is decreasing, but this does not rule out the possibility that the operating frequency of the compressor 1 may increase within a certain period of time.

[0179] When the room temperature reaches the set temperature and meets the shutdown conditions, the controller 71 will automatically stop the compressor 1, i.e., the temperature shutdown. To prevent the cold air blown by the indoor unit 11 after the compressor 1 stops from blowing and causing discomfort to the user, the general practice is to continue running the indoor fan motor for a period of time until the coil temperature drops below the set value and then stops.

[0180] At this time, although the temperature of the heat exchanger coil has dropped, the ambient temperature detection device 4 is generally near the motor of the indoor fan, and the motor generates heat when running and continues to dissipate heat into the air when the motor stops.

[0181] When the motor stops, the airflow near the ambient temperature detection device 4 does not circulate, and the airflow increases due to the heat dissipation of the motor body. The detection value of the ambient temperature detection device 4 is high for a long time, which may cause the actual room temperature to drop at this time. The compressor 1 does not start because the restart conditions are not met. Figure 16 .

[0182] In order to eliminate the influence, during the shutdown period when the temperature is reached, the indoor fan 5 has been running at a lower speed (lower than R1 gear, such as 0.5*R1), and the air guide plate 2 is turned to a smaller angle so that the air does not blow on people, so as to promote air circulation near the ambient temperature detection device 4 and avoid the influence of the air flow of the air conditioner 100 on the user.

[0183] In some implementations of this embodiment, the controller 71 is configured to continue temperature compensation according to the compensation temperature value before the compressor 1 is stopped during the shutdown period of the compressor 1 after the second temperature difference meets the preset shutdown range.

[0184] During the temperature-reaching shutdown period, the motor speed is very low and no longer the set speed. After the compressor 1 stops, the coil temperature will also drop and the air flow will be small. Therefore, during the temperature-reaching shutdown period, temperature compensation is still performed according to T 补 =T 补停机前 (Compensation value T before reaching temperature shutdown 补 ) for temperature compensation. For example, if the compensation temperature value before shutdown is 2°C, the compensation temperature value during shutdown is 2°C.

[0185] In some implementations of this embodiment, the controller 71 is configured to: during the shutdown period of the compressor 1, when the shutdown time of the compressor 1 reaches a certain time and the compressor 1 is still not started, adjust the indoor ambient temperature to offset the first set temperature downward;

[0186] Thereafter, the compensated indoor ambient temperature is biased downward once at a certain interval until the compressor 1 is started again, wherein each interval time is the same or different, and each downward biased temperature is the same or different.

[0187] During the downtime of Dawen, in order to prevent other factors from affecting T 回 The detected value is too high, but the actual temperature of the room has already dropped below the set temperature.

[0188] Therefore, an implementation of the above solution is described. When the temperature-reaching shutdown time exceeds the preset time t1min and is not started, for example, t1 is set to 10min. Then, after t1min (10min), the calculated room temperature (the compensated indoor ambient temperature after temperature compensation) is further offset downward by A2°C, that is, Ta=T 回 -T 补 -A2, make compressor 1 meet the restart conditions and continue heating operation.

[0189] After that, if compressor 1 does not start after t1min, Ta=T 回 -T 补 In some embodiments, A2 is in the range of 0.1°C to 3°C, and t1 is in the range of 3 min to 30 min.

[0190] By analogy, the room temperature Ta decreases by A2°C every t1min until compressor 1 starts.

[0191] After compressor 1 starts, calculate the new compensation temperature value, Ta = T 回 -T补 It should be noted that here the temperature is gradually transitioned to the new compensation temperature value.

[0192] Reference Figure 17 , illustrating the control logic in the heating mode in an embodiment of the present application.

[0193] In heating mode, real-time detection of return air temperature T 回 , the coil temperature (outlet air temperature) Tc of the indoor heat exchanger, the gear position of the indoor fan 5 and the angle of the air guide plate 2 (step S1701);

[0194] Compressor 1 starts working (step S1702);

[0195] Determine whether the heat exchange temperature difference between the coil temperature Tc and the return air temperature is less than Tdmax (step S1703);

[0196] In step S1703, if the heat exchange temperature difference is less than Tdmax, step S1704 is executed to start temperature compensation;

[0197] The corresponding compensation coefficient is obtained by looking up the table and brought into the first logical operation to obtain the new compensation temperature value T 补 , obtain the compensated indoor ambient temperature Ta=T 回 -T 补 ; (step S1706);

[0198] With T1 as the cycle, the compensation value is increased by A1°C per cycle, or with T1 as the cycle, the compensation value is decreased by A1°C per cycle, so as to gradually approach the new compensation temperature value (step S1707);

[0199] Determine whether the operating gear of the indoor fan 5 and / or the position of the air guide plate 2 has changed (step S1708);

[0200] In step S1708, if the working gear of the indoor fan 5 and / or the position of the air guide plate 2 has not changed, step S1709 is executed, and the heat exchange temperature difference of the previous cycle is recorded as Td(0);

[0201] Starting from T2min, record the heat exchange temperature Tc and return air temperature every t2min to obtain the heat exchange temperature difference Td (step S1710);

[0202] Determine whether |Td(T2+t2*j)-Td(0)|≥ΔTd (step S1711);

[0203] In step S1711, if |Td(T2+t2*j)-Td(0)|≥ΔTd, then step S1712 is executed to calculate a new compensation temperature value and gradually approach the new compensation value at A1°C / cycle T1 increments (-A1°C / cycle T1 decrements);

[0204] In step S1711, if |Td(T2+t2*j)-Td(0)|<ΔTd, then execute step S1710;

[0205] In this embodiment, the variable period is adjusted by setting rules. Of course, in step S1709, the return air temperature and the outlet air temperature can also be detected according to the set variable period or fixed period as the detection period, and the heat exchange temperature difference is determined accordingly to calculate the new compensation temperature value.

[0206] In step S1708, if the working gear of the indoor fan 5 and / or the position of the air guide plate 2 changes, step S1713 is executed, and after a delay of t3, the T 回 , Tc, the working gear of the indoor motor and the angle of the air guide plate 2; illustratively, the value range of t3 is 0.5min~30min.

[0207] Calculate the new compensation temperature value T 补 (Step S1714);

[0208] When calculating the compensation temperature value T 补 Then, based on the relationship between the compensated indoor ambient temperature Ta and the set temperature Ts, the frequency of compressor 1 is controlled according to the frequency control algorithm of compressor 1 so that Ta reaches the set temperature Ts;

[0209] In step S1703, if the heat exchange temperature difference is not less than Tdmax, step S1705 is executed without performing temperature compensation.

[0210] Reference Figure 18 , explaining the control logic during the Dawen shutdown.

[0211] When the temperature-reaching shutdown condition is met, compressor 1 stops and the compensation value T before the shutdown is recorded. 补停机前 (Step S1801);

[0212] The air guide plate 2 rotates to a small angle position, and the indoor fan runs at a relatively low speed (step S1802);

[0213] Determine whether the time for temperature-reaching shutdown reaches t1 (step S1803);

[0214] In step S1803, if the time for temperature-reaching shutdown reaches t1, step S1804 is executed to adjust the indoor ambient temperature Ta to Ta=T 回 -T补 -A2;

[0215] Determine whether compressor 1 is turned on (step S1805);

[0216] In step S1805, if the compressor 1 is turned on, step S1806 is executed to perform the heating mode normally;

[0217] In step S1805, if the compressor 1 is not turned on, step S1807 is executed to determine whether the time for reaching the temperature and stopping the compressor reaches t1+T2*j, j=1 (step S1808);

[0218] In step S1807, if the time for temperature shutdown reaches t1+j*T2, step S1808 is executed and the indoor ambient temperature Ta is adjusted to Ta=T 回 -T 补 -A2*j;

[0219] Determine whether compressor 1 is turned on (step S1809);

[0220] In step S1809, if compressor 1 is turned on, step S1806 is executed;

[0221] In step S1809, if compressor 1 is not turned on, step S1810 is executed, j=j+1; then step S1807 is executed;

[0222] In step S1807, if the time to reach temperature shutdown does not reach t1+j*T2, then execute step S1807;

[0223] In step S1803, if the time for temperature-reaching shutdown has not reached t1, then step S1803 is executed;

[0224] It should be noted that the basic detection period T2 is greater than the period T1.

[0225] In some implementations of this embodiment, when a new detection cycle of the heat exchange temperature difference Td begins (the variable cycle is Tx=T2+j*t2), the remaining compensation values ​​that have not been approximated are no longer executed.

[0226] For example, T1 is 2 minutes, the difference between two adjacent compensation temperature values ​​is 4°C (the latter value is 4°C higher than the former value), and A1 is 0.5°C. In this way, the temperature increases by 0.5°C every 2 minutes, and a total of 8 cycles (16 minutes) are required. However, Tx is 12 minutes, and only 6 cycles are actually executed. The compensation value only rises by 3°C, and the new compensation value is recalculated. At this time, the temperature approximation action with 2 cycles left is no longer executed.

[0227] Alternatively, if T1 is 30 seconds, the difference between two adjacent compensation values ​​is 4°C (the latter value is 4°C higher than the former), and A1 is 0.1°C, then a 0.1°C increase every 30 seconds would require 40 cycles (20 minutes). However, since Tx is 10 minutes, only 20 cycles are actually executed before the compensation value increases by 2.0°C. The new compensation value then begins to be recalculated, and the remaining 10 cycles of the temperature approximation action are no longer executed.

[0228] The following control logic uses a specific model as an example. The heating compensation parameters for this model are set as follows: Indoor motor speed is set to 5 gears (R5 to R1), t1 = 10 min, T1 = 2 min, T2 = 10 min, T3 = 5 min, K_Fan_H = 0.06, K_Fan_L = 0.24, A1 = 0.5°C, and A2 = 0.5°C. In this case, temperature compensation approaches a periodic variation of 0.5°C / 2 min.

[0229] Among them, T 补 Maximum value T 补 max=6℃,T 补 Minimum value T 补 min=0.5℃. That is, when the calculated T 补 >6℃, the maximum is 6℃. 补 <0.5℃, minimum is 0.5℃. R1 gear motor speed is 600rpm.

[0230] In heating operation mode, the set temperature is 23°C and compressor 1 starts;

[0231] Detect return air temperature T 回 , the angle of the air guide plate 2, the indoor motor gear R4, the indoor heat exchange coil temperature Tc, calculate the heat exchange temperature difference Td = Tc-T 回 ;

[0232] When T 回 =15℃, Tc=22℃, calculated Td=22-15=7℃, temperature compensation is required;

[0233] Look up Table 2 (K_Fan = 0.078) and Table 3 (T_Angle = -0.5°C), and bring them into the first control logic to calculate T 补 =0.078*7+(-0.5)≈0℃, and T 补 Minimum value = 0.5℃, so T 补 Take 0.5℃.

[0234] Gradually increase the temperature to T at a rate of 0.5℃ / 2min 补 =0.5℃ (a total of 2 minutes is required for one cycle). Specifically, at 2 minutes, T 补 =0.5℃, at this time T 回=16℃, that is, Ta=16-0.5=15.5℃.

[0235] 10min(T3=10min), T 回 =18℃, Tc=43℃, calculated Td=25℃. Calculate T 补 =0.078*25+(-0.5)≈1.5℃.

[0236] The difference between the two compensation values ​​before and after = 1.5-0.5 = 1°C, and gradually increase to T at a rate of 0.5°C / 2min 补 =1.5℃ (a total of 2 cycles of 4 minutes are required).

[0237] At 15 minutes, T 补 =1.5℃, at this time T 回 =19℃, that is, Ta=19-1.5=17.5℃.

[0238] At a certain moment (new reference moment), the user adjusts the wind speed to R2 and adjusts the wind deflector angle to position 3. 回 =22℃, Tc=50℃, calculate Td=28℃. Look up Tables 2 and 3, and use the first operation logic to calculate T 补 =0.168*28+0≈4.5℃.

[0239] The difference between the two compensation values ​​(if the previous compensation value is 1.5°C) = 4.5-1.5 = 3.0°C, and gradually increase to T at a rate of 0.5°C / 2min. 补 =4.5℃ (a total of 6 cycles of 12 minutes are required).

[0240] At a certain moment + 10 minutes (new detection cycle), T 补 =1.5+0.5℃ / 2min*10min=4.0℃(the remaining unapproximated compensation value is no longer approximated), at this time T 回 =25.5℃, that is, Ta=25.5-4=21.5℃. 回 =25.5℃, Tc=55.5℃, calculate Td=30℃. Look up Tables 2 and 3, and bring them into the first operation logic to calculate T 补 =0.168*30+0≈5.0℃.

[0241] Gradually increase the temperature to T at a rate of 0.5℃ / 2min 补 =5.0℃ (the previous compensation value is 4℃), that is, at a certain moment + 20min (new detection cycle), T 补 =5℃, at this time T 回 =28.5℃, that is, Ta=28.5-5=23.5℃.

[0242] After several minutes, Ta>23℃ and the temperature shutdown condition is met, the compressor 1 stops, the indoor motor runs at an extremely low speed of 300rpm, and the angle of the air guide plate 2 is turned to the minimum angle position (cold wind protection angle).

[0243] Record the compensation temperature T before shutdown 补停机前 =2.5℃ (This is because as Ta increases, the frequency of compressor 1 gradually decreases, causing Tc to eventually decrease. For example, at 31℃, T 补 =4.2*0.6+0≈2.5℃), that is, during the shutdown period when the temperature reaches the limit, T 补 =2.5℃.

[0244] When the temperature reaches the limit and the machine is shut down for 10 minutes (t1=10 minutes), detect T 回 =27℃, Ta=27-2.5=24.5℃>23℃(set temperature), the compressor 1 start condition (Ts>Ta) is not met. Recalculate Ta=27-2.5-0.5=24℃>23℃, which meets the compressor 1 start condition; when the temperature reaches the shutdown temperature for 15 minutes (T2=5 minutes), T 回 =26℃, Ta=T 回 -T 补 -2*0.5=26-2.5-1=22.5℃<23℃, the compressor 1 start condition is met, and compressor 1 is started.

[0245] In some embodiments of the present application, the controller 71 can perform a second logical operation based only on the heat exchange temperature difference between the coil temperature and the return air temperature and the wind speed compensation coefficient determined by the working gear to obtain a compensation temperature value to perform temperature compensation on the measured indoor ambient temperature, so as to more accurately control the operation of the refrigeration system, so that the actual indoor average temperature is basically consistent with the set temperature, which can effectively improve thermal adaptability.

[0246] Specifically, the compensation temperature T of the indoor ambient temperature of the air conditioner 100 in this embodiment is 补 The second logical operation is:

[0247] T 补 =K_Fan*Td

[0248] Among them, T 补 is the compensation temperature value, K_Fan is the wind speed compensation coefficient, and Td is the heat exchange temperature difference.

[0249] In some embodiments of the present application, the controller 71 can perform temperature compensation for the measured indoor ambient temperature based only on the heat exchange temperature difference between the coil temperature and the return air temperature and the angle compensation coefficient determined by the angle of the air guide plate 2, so as to more accurately control the operation of the refrigeration system, so that the actual indoor average temperature is basically consistent with the set temperature, which can effectively improve thermal adaptability.

[0250] Specifically, the compensation temperature T of the indoor ambient temperature of the air conditioner 100 in this embodiment is 补 The operation logic is:

[0251] T 补 =k*Td+K_Angle

[0252] Among them, T 补 is the compensation temperature value, Td is the heat exchange temperature difference, k is the setting coefficient, which can be obtained based on experience or experiments, and K_Angle is the angle compensation coefficient.

[0253] In some embodiments of the present application, the controller 71 can perform temperature compensation for the measured indoor ambient temperature based only on the angle compensation coefficient determined by the angle of the air guide plate 2 and the wind speed compensation coefficient determined by the working gear, so as to more accurately control the operation of the refrigeration system, so that the actual indoor average temperature is basically consistent with the set temperature, which can effectively improve thermal adaptability.

[0254] Specifically, the compensation temperature T of the indoor ambient temperature of the air conditioner 100 in this embodiment is 补 The operation logic is:

[0255] T 补 =K_Fan+K_Angle

[0256] Among them, T 补 is the compensation temperature value, K_Fan is the wind speed compensation coefficient, and K_Angle is the angle compensation coefficient.

[0257] The air conditioner 100 in this embodiment includes a coil temperature detection device 3 arranged on the indoor heat exchanger and an ambient temperature detection device 4 arranged at the return air outlet 13 of the indoor unit 11. The coil temperature detection device 3 is used to detect the coil temperature of the indoor heat exchanger, and defines the coil temperature as the outlet air temperature, and performs temperature compensation accordingly. The ambient temperature detection device 4 is used to detect the return air temperature, and defines the return air temperature as the measured indoor ambient temperature to provide a base for subsequent temperature compensation. The controller 71 is configured to, when the outlet air temperature meets the preset compensation condition, determine that temperature stratification has occurred in the room at this time, and the tested indoor ambient temperature needs to be compensated to accurately control the operation of the compressor 1.

[0258] During the temperature compensation process, an angle compensation coefficient is determined based on the position or operating state of air deflector 2, and a wind speed compensation coefficient is determined based on the operating gear of indoor fan 5. A first logical operation is performed based on the heat exchange temperature difference, the angle compensation coefficient, and the wind speed compensation coefficient to obtain a compensated temperature value. This temperature value is then used to compensate the measured indoor ambient temperature detected by ambient temperature detection device 4 to obtain a compensated indoor ambient temperature, which is used to adjust the operation of subsequent components of air conditioner 100. The frequency of compressor 1 is adjusted based on a second temperature difference between the compensated indoor ambient temperature and the set temperature, and compressor 1 is shut down when the second temperature difference meets a preset shutdown range. When the air conditioner 100 determines that temperature stratification has occurred indoors, it determines a corresponding compensation coefficient based on the outlet air temperature, the position of air deflector 2, and the operating gear of indoor fan 5, and thereby obtains a compensated temperature value to obtain a compensated indoor ambient temperature, thereby ensuring that the average temperature within the indoor user activity space is substantially consistent with the set temperature, thereby improving the user's thermal comfort.

[0259] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An air conditioner, characterized in that: include: An indoor unit is installed at the top or upper part of the room, and includes a return air inlet and an air outlet communicating with the room, wherein the return air inlet and the air outlet are arranged above the user activity area; A refrigerant circulation loop, wherein the refrigerant circulates in a loop consisting of a compressor, a condenser, an expansion valve, and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger; An ambient temperature detection device, which is provided at the return air outlet, is used to detect the return air temperature and define the return air temperature as the measured indoor ambient temperature to provide a base for subsequent temperature compensation; An indoor fan, which is arranged near the indoor heat exchanger and is used to deliver the heat-exchanged air into the room; an air guide plate disposed at the air outlet, the air guide plate adjusting the outflow direction of the air flowing through the air outlet by changing the relative rotation angle between the air guide plate and the air outlet; a coil temperature detection device, which is provided on the indoor heat exchanger, for detecting the coil temperature of the indoor heat exchanger and defining the coil temperature as the air outlet temperature; The controller is configured to: after receiving a heating signal, obtain a difference between the outlet air temperature and the measured indoor ambient temperature, define the difference as a heat exchange temperature difference, determine that the indoor temperature is stratified when the heat exchange temperature difference is within a set range [Tdmin, Tdmax], and perform temperature compensation on the measured indoor ambient temperature; wherein Tdmin is set according to the temperature limit of the room stratification; and Tdmax is set according to the reliability and cooling performance constraints of the refrigeration system; Determine the angle compensation coefficient according to the angle of the air deflector; Determine the wind speed compensation coefficient according to the working gear of the indoor fan; performing a first logical operation based on the heat exchange temperature difference, the angle compensation coefficient, and the wind speed compensation coefficient to obtain a compensated temperature value, and compensating the measured indoor ambient temperature accordingly to obtain a compensated indoor ambient temperature; The first operation logic is: in, To compensate for the temperature value, is the wind speed compensation coefficient, is the heat transfer temperature difference, is the angle compensation coefficient; In the first logical operation, the relationship between the heat exchange temperature difference and the wind speed compensation coefficient in temperature compensation is a product relationship, and the influence of the angle compensation coefficient on temperature compensation is an addition and subtraction relationship; The frequency of the compressor is adjusted according to a second temperature difference between the compensated indoor ambient temperature and the set temperature, and the compressor is turned off when the second temperature difference meets a preset shutdown range.

2. The air conditioner according to claim 1, characterized in that The controller is configured to calculate a new compensation temperature value when the working gear of the indoor fan and / or the angle of the air guide plate changes, and periodically increase or decrease the previous compensation temperature value to switch the compensation temperature value to the new compensation temperature value, thereby adjusting the compensated indoor ambient temperature so that the change range of the indoor ambient temperature is within a third temperature range.

3. The air conditioner according to claim 1, characterized in that The controller is configured to: upon receiving a heating signal, adjust the operating frequency of the compressor so that the compensated indoor ambient temperature gradually approaches or exceeds a set temperature, and control the compressor to shut down when a second temperature difference between the compensated indoor ambient temperature and the set temperature meets a lower limit of a preset shutdown range; Before the compressor stops, the working gear of the indoor fan and the angle of the air guide plate remain unchanged in the current working state.

4. The air conditioner according to claim 3, characterized in that The controller is configured to continue temperature compensation according to the compensation temperature value before the compressor is stopped during the period when the compressor is stopped after the second temperature difference satisfies a preset shutdown range.

5. The air conditioner according to any one of claims 1 to 4, characterized in that: The controller is configured to: during the shutdown period of the compressor, when the shutdown time of the compressor reaches a certain time and the compressor is still not started, adjust the indoor ambient temperature to offset the first set temperature downward; Thereafter, the compensated indoor ambient temperature is biased downward once at a certain interval until the compressor is started again, wherein each interval time is the same or different, and each downward biased temperature is the same or different.

6. The air conditioner according to claim 1, characterized in that The controller is configured to: when the working gear of the indoor fan remains unchanged and two consecutive changes in the indoor ambient temperature are within a first temperature range, the compressor operates at a certain frequency; Get the heat exchange temperature difference of the previous detection cycle ; Detect the return air temperature and the coil temperature at a certain detection interval to obtain the corresponding heat exchange temperature difference. When the difference between the two reaches the preset threshold, it is determined that the heat exchange temperature difference changes greatly at this time, and the acquisition time and The difference in the acquisition time is defined as the variable detection period, and the new compensation temperature value is calculated; The heat exchange temperature difference that meets the conditions is taken as the new ; The above detection intervals are the same or different.

7. The air conditioner according to any one of claims 1 to 4 and 6, characterized in that: The indoor fan is provided with multiple gears, and a range value of the wind speed compensation coefficient is set. The highest gear of the indoor fan is set to correspond to the upper limit value of the above range value, and the lowest gear of the indoor fan is set to correspond to the lower limit value of the above range value. The other gears of the indoor fan are determined by interpolation method to determine the corresponding wind speed compensation coefficient.

8. The air conditioner according to claim 3, characterized in that The controller is configured to control the compressor to stop when a second temperature difference between the compensated indoor ambient temperature and the set temperature meets a lower limit of the preset shutdown range; During the shutdown period of the compressor, the indoor fan operates at a certain speed, and the air guide plate rotates so that the air blown out of the air outlet does not blow towards the user activity area.

9. An air conditioner, characterized in that: include: An indoor unit is provided at the top or upper portion of the room, the indoor unit comprising an air return port and an air outlet communicating with the room; A refrigerant circulation loop, wherein the refrigerant circulates in a loop consisting of a compressor, a condenser, an expansion valve, and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger; An ambient temperature detection device, which is provided at the return air outlet, is used to detect the return air temperature and define the return air temperature as the measured indoor ambient temperature to provide a base for subsequent temperature compensation; An indoor fan, which is arranged near the indoor heat exchanger and is used to deliver the heat-exchanged air into the room; a coil temperature detection device, which is provided on the indoor heat exchanger, for detecting the coil temperature of the indoor heat exchanger and defining the coil temperature as the air outlet temperature; The controller is configured to: after receiving a heating signal, obtain a difference between the outlet air temperature and the measured indoor ambient temperature, define the difference as a heat exchange temperature difference, determine that the indoor temperature is stratified when the heat exchange temperature difference is within a set range [Tdmin, Tdmax], and perform temperature compensation on the measured indoor ambient temperature; wherein Tdmin is set according to the temperature limit of the room stratification; and Tdmax is set according to the reliability and cooling performance constraints of the refrigeration system; Determine the wind speed compensation coefficient according to the working gear of the indoor fan; performing a second logical operation based on the heat exchange temperature difference and the wind speed compensation coefficient to obtain a compensated temperature value, and compensating the measured indoor ambient temperature accordingly to obtain a compensated indoor ambient temperature; The second logical operation is: in, To compensate for the temperature value, is the wind speed compensation coefficient, is the heat exchange temperature difference; In the second logical operation, the compensation temperature value is proportional to the product of the heat exchange temperature difference and the wind speed compensation coefficient; The frequency of the compressor is adjusted according to a second temperature difference between the compensated indoor ambient temperature and the set temperature, and the compressor is turned off when the second temperature difference meets a preset shutdown range.

10. The air conditioner according to claim 9, characterized in that The controller is configured to continue temperature compensation according to the compensation temperature value before the compressor is stopped during the period when the compressor is stopped after the second temperature difference satisfies a preset shutdown range.

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