An air conditioner

Abstract

The application discloses an air conditioner, which comprises at least one indoor unit and an outdoor unit connected with the indoor unit; the indoor unit comprises an indoor controller and an indoor temperature sensor connected with the indoor controller; the outdoor unit comprises an outdoor controller and a compressor connected with the outdoor controller; the outdoor controller is in communication connection with each indoor controller; during a temperature stop period after the compressor is started, the indoor controller acquires indoor temperature from the indoor temperature sensor for multiple times and transmits the indoor temperature to the outdoor controller; the outdoor controller acquires a correction coefficient for correcting a starting frequency of next starting of the compressor according to a change speed of the indoor temperature; when the compressor is started next time, the outdoor controller acquires a target starting frequency, corrects the target starting frequency by using the correction coefficient to obtain the starting frequency, and controls starting of the compressor by using the starting frequency. The application improves temperature adjusting efficiency and user comfort, and improves user experience.

Description

Technical Field

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

[0002] When a multi-split air conditioner starts up, it calculates the initial target operating frequency of the compressor based on sensor feedback parameters and the set temperature, causing the compressor to quickly increase its frequency to achieve rapid cooling or heating. When the room temperature or the number of units in operation changes, it adjusts the compressor's operating frequency in real time, raising or lowering it to regulate the room temperature.

[0003] The compressor's initial operating frequency is adjusted based on the ambient temperature, set temperature, and starting power. Because it cannot identify room size, it cannot accurately determine the room's required heat load. When the room is too small, a high initial frequency calculation will lead to excessive output capacity and over-adjustment of the temperature, resulting in large temperature fluctuations and high energy consumption. When the room is too large, a low target frequency will cause slow room temperature adjustment and poor comfort.

[0004] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0005] To address the issue of low temperature regulation efficiency and reduced comfort caused by the mismatch between the compressor's starting frequency, which is obtained solely based on ambient temperature, set temperature, and operating power, and the total room load demand, as mentioned in the background art, this invention proposes an air conditioner that measures the room load based on the indoor temperature change between compressor startup and shutdown at the set temperature. This corrects the starting frequency of the next compressor startup, improving the efficiency of temperature regulation and user comfort during the initial startup phase, thereby enhancing the user experience.

[0006] To achieve the above-mentioned objectives, the present invention employs the following technical solution: An air conditioner includes at least one indoor unit and an outdoor unit connected thereto; the indoor unit includes an indoor controller and an indoor temperature sensor connected thereto; the outdoor unit includes an outdoor controller and a compressor connected thereto; the compressor is an inverter compressor; the outdoor controller is communicatively connected to each of the indoor controllers. From the time the compressor starts until it reaches its operating temperature and stops, the indoor controller repeatedly acquires the indoor temperature from the indoor temperature sensor and transmits it to the outdoor controller. The outdoor controller obtains a correction coefficient based on the rate of change of the indoor temperature to adjust the starting frequency for the next compressor start. When the compressor starts again, the outdoor controller obtains the target starting frequency, uses the correction coefficient to adjust the target starting frequency to obtain the starting frequency, and uses the starting frequency to control the compressor to start.

[0007] In some specific embodiments, the outdoor controller presets a target temperature arrival time, and obtains the actual temperature arrival time when the compressor stops operating at the target temperature. This actual temperature arrival time is the operating time of the compressor from startup to its shutdown at the target temperature. The correction coefficient is equal to the ratio of the actual temperature arrival time to the target temperature arrival time.

[0008] In some specific embodiments, The target temperature arrival time includes the upper target time and the lower target time. When the actual temperature arrival time is not less than the target upper limit time, the correction coefficient is the ratio of the actual temperature arrival time to the target upper limit time; When the actual temperature arrival time is not greater than the target lower limit time, the correction coefficient is the ratio of the actual temperature arrival time to the target lower limit time; When the actual temperature arrival time is between the target lower limit time and the target upper limit time, the correction coefficient is equal to 1.

[0009] In some specific embodiments, the outdoor controller presets a capability constant and is configured to obtain a corrected capability constant by correcting the capability constant through the correction coefficient; the start frequency is a linear function of the corrected capability constant.

[0010] In some specific embodiments, the outdoor controller presets a correction capability constant threshold and is configured to compare the product of the correction coefficient and the capability constant with the correction capability constant threshold; If the product of the correction coefficient and the capability constant is greater than the maximum value of the correction capability constant threshold, then the correction capability constant is equal to the maximum value of the correction capability constant threshold. If the product of the correction coefficient and the capability constant is less than the minimum value of the correction capability constant threshold, then the correction capability constant is equal to the minimum value of the correction capability constant threshold. If the product of the correction coefficient and the capability constant is within the range of the correction capability constant threshold, then the correction capability constant is equal to the product of the correction coefficient and the capability constant.

[0011] In some specific embodiments, the outdoor controller is further configured with a cooling mode and a heating mode, and is configured to control the compressor to start at the target start frequency when the outdoor unit starts after switching between the cooling mode and the heating mode, and to obtain the correction coefficient for correcting the start frequency when starting in the same mode next time.

[0012] In some specific embodiments, the outdoor controller is further configured to control the compressor to start at the target starting frequency when the outdoor unit is powered on after a power outage, and to obtain the correction coefficient for correcting the starting frequency when starting in the same mode next time.

[0013] In some specific embodiments, the indoor controller is configured to acquire the indoor temperature multiple times and transmit it to the outdoor controller starting from the temperature-controlled shutdown. The outdoor controller is configured to define the room load based on the obtained rate of change of each of the indoor temperatures when the compressor stops at the set temperature, and to perform the next temperature-based shutdown control based on the room load. A preset indoor temperature change rate threshold is defined as a continuous threshold range. When the indoor temperature change rate is not less than the maximum value of the indoor temperature change rate threshold, it is defined as a high load. When the indoor temperature change rate is not greater than the minimum value of the indoor temperature change rate threshold, it is defined as a low load.

[0014] In some specific embodiments, the outdoor controller presets a fixed duration; when the compressor stops at the set temperature, it acquires the indoor temperature and starts timing; when the fixed duration is reached, it acquires the indoor temperature again; the rate of change of the indoor temperature is the change value of the indoor temperature over the fixed duration; the threshold for the rate of change of the indoor temperature is a temperature change threshold.

[0015] In some specific embodiments, the outdoor controller presets a temperature tolerance limit, a minimum operating frequency, and an under-adjustment temperature. The temperature tolerance limit is the maximum value that is allowed to exceed the set temperature positively or negatively; the under-adjustment temperature is a temperature value that negatively exceeds the set temperature but is less than the temperature tolerance limit. The outdoor controller is configured to control the compressor to operate at the minimum operating frequency when the high load is applied, the compressor is running, and the indoor temperature reaches the set temperature again; and to stop the compressor when the indoor temperature is over-adjusted to the temperature tolerance limit; and to switch to normal control when the indoor temperature is under-adjusted to the temperature tolerance limit. When the compressor is running under the low load and the indoor temperature reaches the under-adjustment temperature again, the compressor is controlled to operate at the minimum operating frequency. When the indoor temperature is over-adjusted to the temperature tolerance limit, the compressor stops at the temperature. When the indoor temperature is under-adjusted to the temperature tolerance limit, the compressor switches to normal control.

[0016] The air conditioner of this invention measures whether the compressor's starting frequency is suitable for the cooling or heating capacity required by the configured cooling or heating space based on the indoor temperature change between compressor startup and shutdown. That is, the cooling load or heating load, the air conditioner obtains a correction coefficient based on the indoor temperature change and corrects the compressor's starting frequency for the next startup. This corrected frequency better matches the load demand of the cooling or heating space, allowing the indoor temperature in the cooling or heating space to quickly reach the set temperature without over-adjustment, improving temperature control efficiency and user comfort, thereby enhancing the user experience.

[0017] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the system structure according to an embodiment; Figure 2 This is a schematic diagram of the system structure according to an embodiment; Figure 3 This is a schematic diagram of the connection structure of the control components according to an embodiment; Figure 4 This is a schematic diagram of the control flow according to an embodiment; Figure 5 This is a schematic diagram of the control flow according to an embodiment; Figure 6 This is a schematic diagram of the control flow according to an embodiment; Figure 7 This is a schematic diagram of the control flow according to an embodiment; Figure 8 This is a schematic diagram of the control flow according to an embodiment; Figure 9 This is a schematic diagram of the control flow according to an embodiment; Figure 10 This is a schematic diagram of the control flow according to an embodiment; Figure 11 This is a schematic diagram of the temperature regulation control process according to an embodiment; Figure 12 This is a schematic diagram of the temperature regulation control process according to an embodiment.

[0020] Figure label, 1. Indoor unit; 11. Indoor controller; 12. Indoor temperature sensor; 2. Outdoor unit; 21. Outdoor controller; 22. Compressor. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0023] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0027] Air Conditioner Working Principle Air conditioners execute a refrigeration cycle using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle involves a series of processes, including compression, condensation, expansion, and evaporation, to cool or heat an indoor space.

[0028] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into a 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, and the heat is released to the surrounding environment through the condensation process.

[0029] The expansion valve expands the high-temperature, high-pressure liquid refrigerant that condenses in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0030] The outdoor unit of an air conditioner refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioner includes the indoor heat exchanger, and an expansion valve can be provided in either the indoor or outdoor unit.

[0031] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0032] [This application] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 The air conditioner of the present invention includes at least one indoor unit 1 and an outdoor unit 2 connected to each indoor unit 1. The indoor unit 1 includes an indoor controller 11 and an indoor temperature sensor 12 connected thereto. The indoor temperature sensor 12 detects the indoor temperature and transmits it to the indoor controller 11. The outdoor unit 2 includes an outdoor controller 21 and a compressor 22 connected thereto. The compressor 22 is a variable frequency compressor 22, and its operation and operating frequency are controlled and adjusted by the outdoor controller 21. The outdoor controller 21 is communicatively connected to each indoor controller 11.

[0033] During the period from compressor startup to temperature-controlled shutdown, indoor controller 11 obtains indoor temperature from indoor temperature sensor 12 and transmits it to outdoor controller S1; outdoor controller 21 obtains correction coefficient S2 based on the rate of change of indoor temperature to correct the startup frequency when the compressor restarts after temperature-controlled shutdown; when the compressor restarts, outdoor controller 21 obtains the target startup frequency based on the load, corrects the target startup frequency through the correction coefficient to obtain the startup frequency, and uses the startup frequency to control the compressor restart S3.

[0034] When the compressor starts for the first time, the outdoor controller 21 obtains the target starting frequency based on the load and controls the compressor to start and run at the target starting frequency. Between the start-up of the compressor and its shutdown at the target temperature, the indoor controller 11 obtains the indoor temperature multiple times. A correction coefficient is obtained based on the rate of change of the multiple indoor temperatures. After the compressor shuts down at the target temperature, the indoor temperature gradually rises. When the temperature reaches the compressor's start-up temperature again, the compressor starts up again. The outdoor controller 21 obtains the target starting frequency based on the load, corrects the target starting frequency using the correction coefficient to obtain the starting frequency, and uses the starting frequency to control the compressor to start up again.

[0035] When the compressor is not starting for the first time, the outdoor controller 21 obtains the target starting frequency based on the load, corrects the target starting frequency with a correction coefficient to obtain the starting frequency, and controls the compressor to start and run at the starting frequency. During the period from compressor start-up to its temperature-reaching shutdown, the indoor controller 11 obtains the indoor temperature multiple times. Based on the rate of change of the multiple indoor temperatures, the correction coefficient is obtained to update the previous correction coefficient value. After the compressor stops at the temperature, the indoor temperature gradually rises. When it reaches the compressor start-up temperature again, the compressor starts again. The outdoor controller 21 obtains the target starting frequency based on the load, corrects the target starting frequency with a correction coefficient to obtain the starting frequency, and uses the starting frequency to control the compressor to start again.

[0036] The air conditioner of the present invention measures whether the starting frequency of the compressor 22 is suitable for the cooling or heating capacity required by the existing cooling or heating space, i.e., the cooling load or heating load, based on the rate of change of indoor temperature between the start-up of the compressor 22 and its shutdown at the set temperature. It also obtains a correction coefficient based on the change of indoor temperature to correct the starting frequency of the compressor 22 when it starts up next time, so that when it starts up and operates at the corrected starting frequency, it is more in line with the load demand of the cooling or heating space. This allows the indoor temperature in the cooling or heating space to quickly reach the set temperature without over-adjustment, improving temperature regulation efficiency and quality, and enhancing user comfort and user experience.

[0037] The control process and principle of the air conditioner of the present invention will be described in detail below through specific embodiments.

[0038] In some specific embodiments, refer to Figure 5 The outdoor controller 21 presets the target temperature arrival time S21, which is the target time required from startup to the indoor temperature reaching the set temperature.

[0039] When the compressor reaches the temperature and stops, the outdoor controller 21 obtains the actual temperature-reaching time S22, which is the operating time from the start of the compressor to its temperature-controlled shutdown. At this time, all indoor units 1 detect that the indoor temperature has reached the temperature-reaching shutdown condition and stop.

[0040] The correction factor S23 is obtained based on the ratio of the actual temperature arrival time to the target temperature arrival time; that is, the correction factor is obtained based on the ratio of the actual temperature arrival time to the target temperature arrival time. The actual temperature arrival time is the time it takes for the indoor temperature to reach the set temperature, which is actually the rate of change of indoor temperature achieved through the operation of the air conditioner.

[0041] In this embodiment, the air conditioner obtains a correction coefficient by comparing the actual time to reach the target temperature with the actual time to reach the target temperature. This coefficient is used to correct the starting frequency of the compressor the next time it starts. The actual time to reach the target temperature indirectly represents the rate of change of indoor temperature, reducing data storage and calculation, simplifying control logic, and improving control efficiency.

[0042] In some specific embodiments, refer to Figure 6 The target arrival time includes the target upper limit time and the target lower limit time; the target upper limit time is greater than the target lower limit time S211.

[0043] When the actual temperature arrival time is not less than the target upper limit time (S231), the correction coefficient is the ratio of the actual temperature arrival time to the target upper limit time (S232), which is a number greater than 1. When the correction coefficient greater than 1 corrects the target start frequency, the obtained start frequency increases relative to the target start frequency, so that the compressor can adapt to the larger load demand of the cooling or heating space when it starts next time, thus achieving the effect of rapid cooling or rapid heating.

[0044] When the actual temperature arrival time is not greater than the target lower limit time (S233), the correction coefficient is equal to the ratio of the actual temperature arrival time to the target lower limit time (S234), which is a number less than 1. When the correction coefficient less than 1 corrects the target start frequency, the obtained start frequency decreases relative to the target start frequency, so that the compressor 22 can adapt to the smaller load demand of the cooling or heating space when it starts next time, prevents over-adjustment of cooling or heating, improves comfort, and thus enhances the user experience.

[0045] When the actual temperature arrival time is between the target lower limit time and the target upper limit time, the correction coefficient is equal to 1, and the target start frequency is not corrected S235; that is, the compressor 22 will start operation at the target start frequency obtained next time it starts.

[0046] In this embodiment, the air conditioner adjusts the ratio of the actual temperature arrival time to the target temperature arrival time based on the room size and load, thereby adjusting the compressor's starting frequency according to the room size and load. Furthermore, by setting the target upper limit time and target lower limit time, the upper limit adjustment base, lower limit adjustment base, and no adjustment range for the frequency are set, preventing the compressor 22's starting frequency adjustment range from being too large and the adjustment frequency from being too large, thus improving the stability and reliability of the compressor 22's operation.

[0047] In some specific embodiments, the outdoor controller 21 presets a capability constant, which is used to calculate the target starting frequency when the compressor 22 starts; the outdoor controller 21 is configured to obtain a corrected capability constant by correcting the preset capability constant through a correction coefficient, which is used to calculate the starting frequency when the compressor 22 starts.

[0048] The target starting frequency of compressor 22 is a linear function of the capability constant; for example, the target starting frequency is calculated by multiplying the capability constant, the sum of the power of each indoor unit 1 that is started, and the difference between the indoor temperature and the set temperature; the starting frequency of compressor 22 is obtained by correcting the preset capability constant, which is a linear function of the corrected capability constant; specifically, the starting frequency of compressor 22 is calculated by multiplying the corrected capability constant, the sum of the starting power of each indoor unit 1, and the difference between the indoor temperature and the set temperature.

[0049] The air conditioner in this embodiment corrects the preset capacity constant by using a correction coefficient. This allows the fixed capacity constant to be adjusted according to the actual load conditions during the installation or use of the unit to obtain a corrected capacity constant that adapts to different usage conditions. This improves the flexibility of the air conditioner's start-up control and the efficiency of temperature regulation, meeting the user's needs for rapid temperature rise and comfort.

[0050] Furthermore, the target starting frequency or starting frequency of compressor 22 is also related to the sum of the power of each indoor unit 1 when it is turned off; that is, the target starting frequency or starting frequency is calculated by the ratio of the power of each indoor unit 1 that is started and put into use to the total power of the indoor units 1, thereby improving the accuracy of the target starting frequency and starting frequency calculation. The power of indoor unit 1 can be expressed in horsepower.

[0051] In some specific embodiments, refer to Figure 7 The outdoor controller 21 presets a correction capability constant threshold S31; and compares the product of the correction coefficient and the capability constant S32 with the correction capability constant threshold; the correction capability constant threshold is a continuous interval value.

[0052] If the product of the correction coefficient and the capability constant is greater than the maximum value S33 of the correction capability constant threshold, then the correction capability constant is equal to the maximum value S34 of the correction capability constant threshold. This prevents the excessive correction capability constant from causing the compressor 22 to start too frequently, leading to system instability or low energy efficiency, such as abnormal pressure parameters or superheat parameters.

[0053] If the product of the correction coefficient and the capability constant is less than the minimum value S350 of the correction capability constant threshold, then the correction capability constant is equal to the minimum value S36 of the correction capability constant threshold. This prevents the system from becoming unstable or having low energy efficiency due to the compressor 22 starting frequency being too low, such as abnormal pressure parameters or superheat parameters.

[0054] If the product of the correction factor and the capacity constant is within the range of the correction capacity constant threshold, then the correction capacity constant is equal to the product of the correction factor and the capacity constant, S37, which enables the unit to operate stably while improving the cooling or heating time to temperature and enhancing the user experience.

[0055] The air conditioner in this embodiment improves the temperature delivery efficiency of the cooling or heating space while ensuring the stability and energy efficiency of the unit operation, thereby enhancing the user experience and improving user comfort.

[0056] In some specific embodiments, refer to Figure 8 The outdoor controller 21 is also equipped with multiple operating modes S4, such as cooling mode and heating mode. Since the temperature control effect required by the cooling mode and heating mode is different, the target start frequency and the temperature control effect required by the start frequency are also different.

[0057] The outdoor controller 21 is configured to control the compressor 22 to operate at the target starting frequency when the unit's operating mode is switched and the compressor 22 starts (S5). The target starting frequency is obtained through capacity constant calculation, and the actual temperature arrival time is obtained when the unit stops operating at the target temperature (S7). When the unit starts again in the same operating mode, the compressor 22 is controlled to operate at the starting frequency obtained with the correction coefficient (S8). The actual temperature arrival time is obtained when the unit stops operating at the target temperature (S8). The corrected starting frequency is used to adjust the starting frequency obtained with the target starting frequency for the next start of the same operating mode, and the system performs cyclic control.

[0058] That is, when the compressor 22 of the unit starts from the cooling mode to the heating mode and from the heating mode to the cooling mode, the compressor 22 starts to operate at the target start frequency, which is obtained by calculating the capacity constant; the compressor 22 starts to operate at the target start frequency by correcting the correction coefficient, specifically by correcting the preset capacity constant by the correction coefficient, and then calculating the start frequency by the corrected capacity constant.

[0059] In this embodiment, the air conditioner clears the correction coefficient when switching operating modes to adapt to changes in set parameters caused by different unit operating modes, thereby improving control accuracy, system stability, and user experience.

[0060] In some specific embodiments, the initial startup after a power outage is the first startup after power-on; subsequent startups are startups after reaching the set temperature and stopping. That is, when the compressor 22 is restarted after a power outage and then powered on again, the target startup frequency is obtained to control its operation, and the actual time to reach the set temperature is obtained. The ratio of this actual time to the target time is calculated to obtain a correction coefficient, which is used to correct the startup frequency for the next startup after reaching the set temperature and stopping. In other words, the corrected startup frequency controls the startup and operation of the compressor 22 for the next startup after reaching the set temperature and stopping.

[0061] When the compressor 22 is not started for the first time, it starts and runs at the corrected start frequency. When it stops at the temperature, it obtains the actual temperature reaching time, obtains the correction coefficient, corrects the start frequency for the next start, and uses this cycle to control the compressor.

[0062] In this embodiment, the correction coefficient is cleared when the air conditioner is powered off to adapt to changes in environmental and set parameters caused by power outage maintenance, modification, or relocation, thereby improving control accuracy and ultimately enhancing the stability and reliability of the unit's operation.

[0063] In some specific embodiments, refer to Figure 9 The outdoor controller 21 is configured to control the operation of the compressor 22 according to the room load when the unit stops at the set temperature.

[0064] Specifically, the indoor controller 11 is configured to acquire the indoor temperature multiple times from the time the unit stops at the temperature until it restarts and transmit the indoor temperature to the outdoor controller 21; the outdoor controller 21 defines the room load based on the rate of change of each indoor temperature at the time of shutdown.

[0065] The outdoor controller 21 presets an indoor temperature change rate threshold S10, which is a continuous threshold range; the outdoor controller 21 acquires multiple indoor temperatures S20 transmitted by the indoor controller 11, and calculates the indoor temperature change rate based on each indoor temperature; and compares the indoor temperature change rate with the indoor temperature change rate threshold. If the rate of change of indoor temperature is not less than the maximum value of the indoor temperature change rate threshold S30, the room load is defined as high load S40; If the rate of change of indoor temperature is not greater than the minimum value of the indoor temperature change rate threshold S50, the room load is defined as low load S60. If the rate of change of indoor temperature is within the range of the indoor temperature change rate threshold, it is considered normal load or rated load S70.

[0066] This embodiment obtains the load status of the cooling or heating space by measuring the rate of change of indoor temperature from when the air conditioner stops operating until it restarts. A large rate of change in indoor temperature indicates that the indoor temperature changes rapidly when the air conditioner stops operating, such as poor insulation or rapid consumption of cooling and heating capacity, indicating a high load. Conversely, a small rate of change in indoor temperature indicates that the indoor temperature changes slowly when the air conditioner stops operating, such as good insulation or slow consumption of cooling and heating capacity, indicating a low load. Different controls are implemented according to different loads to prevent frequent, rapid, and large changes in room temperature, improve room temperature stability, and enhance the user experience.

[0067] In some specific embodiments, refer to Figure 10 , Figure 11 , Figure 12 The outdoor controller 21 has preset temperature tolerance limits, minimum operating frequency, and under-adjustment temperature.

[0068] The temperature tolerance limit is the maximum allowable positive or negative deviation of the indoor temperature from the set temperature. That is, the air conditioner operates with the goal of achieving the set indoor temperature. However, if it starts when the temperature positively exceeds the set temperature and stops when it negatively exceeds the set temperature, the unit will frequently start and stop, resulting in unstable operation and affecting its lifespan. The temperature tolerance limit can be defined as the upper and lower limits of the set temperature deviation.

[0069] That is, when cooling, if the indoor temperature is positively adjusted and exceeds the difference between the set temperature and the temperature tolerance limit, the compressor 22 will stop; if the indoor temperature is negatively adjusted and exceeds the sum of the set temperature and the temperature tolerance limit, the compressor 22 will start. When heating, if the indoor temperature is positively adjusted and exceeds the sum of the set temperature and the temperature tolerance limit, the compressor 22 will stop; if the indoor temperature is negatively adjusted and exceeds the difference between the set temperature and the temperature tolerance limit, the compressor 22 will start.

[0070] Under-adjustment temperature is the temperature value at which the negative temperature adjustment exceeds the set temperature but is less than the temperature tolerance limit. That is, under-adjustment temperature includes cooling under-adjustment temperature and heating under-adjustment temperature. When cooling, the cooling under-adjustment temperature is between the set temperature and the sum of the set temperature and the temperature tolerance limit; when heating, the heating under-adjustment temperature is between the set temperature and the difference between the set temperature and the temperature tolerance limit.

[0071] The minimum operating frequency is the lowest frequency at which compressor 22 operates normally.

[0072] The outdoor controller 21 is configured to control the compressor 22 to operate at the lowest operating frequency when the load is high, the compressor 22 is running, and the indoor temperature reaches the set temperature. It will also stop the compressor when the indoor temperature is over-adjusted to the temperature tolerance limit, and switch to normal control when the indoor temperature is under-adjusted to the temperature tolerance limit. The specific control methods for different operating modes when the compressor 22 operates at the lowest operating frequency are as follows.

[0073] During cooling, if the indoor temperature is over-adjusted to the temperature tolerance limit (the difference between the set temperature and the temperature tolerance limit), the compressor 22 is stopped. If the indoor temperature is under-adjusted to the temperature tolerance limit (the sum of the set temperature and the temperature tolerance limit), the control switches to normal control. Normal control involves adjusting the cooling capacity by controlling the operating frequency of the compressor 22 to keep the indoor temperature close to the set temperature.

[0074] When heating, if the indoor temperature is over-adjusted to the temperature tolerance limit (the sum of the indoor temperature reaching or exceeding the set temperature and the temperature tolerance limit), the compressor 22 is stopped. If the indoor temperature is under-adjusted to the temperature tolerance limit (the difference between the indoor temperature reaching or falling below the set temperature and the temperature tolerance limit), normal control is switched to normal control. Normal control is to adjust the heating capacity by controlling the operating frequency of the compressor 22 to control the indoor temperature to be close to the set temperature.

[0075] The outdoor controller 21 is configured to control the compressor 22 to operate at the lowest operating frequency when the load is low, the compressor 22 is running, and the indoor temperature reaches the under-adjustment temperature, thereby rapidly reducing the cooling or heating capacity in advance to avoid over-adjustment of the cooling or heating space temperature; and to shut down the compressor when the indoor temperature over-adjustment reaches the temperature tolerance limit; and to switch to normal control when the indoor temperature under-adjustment reaches the temperature tolerance limit. The specific control methods for different operating modes when the compressor 22 operates at the lowest operating frequency are as follows.

[0076] During cooling, when the indoor temperature reaches the under-adjustment temperature, the compressor 22 is controlled to operate at the lowest operating frequency; when the indoor temperature over-adjustment reaches the temperature tolerance limit (the difference between the set temperature and the temperature tolerance limit), the compressor 22 is controlled to stop; when the indoor temperature under-adjustment reaches the temperature tolerance limit (the sum of the set temperature and the temperature tolerance limit), normal control is activated. The under-adjustment temperature is lower than the sum of the set temperature and the temperature tolerance limit, but higher than the set temperature.

[0077] During heating, when the indoor temperature reaches the under-adjustment temperature, the compressor 22 operates at the lowest frequency. When the indoor temperature over-adjustment reaches the temperature tolerance limit (the sum of the set temperature and the temperature tolerance limit), the compressor 22 stops. When the indoor temperature under-adjustment reaches the temperature tolerance limit (the difference between the set temperature and the temperature tolerance limit), normal control is activated. The under-adjustment temperature is higher than the difference between the set temperature and the temperature tolerance limit, but lower than the set temperature.

[0078] The outdoor controller 21 is configured to control the compressor 22 to stop when the indoor temperature reaches the over-adjustment temperature tolerance limit and to start when the indoor temperature reaches the under-adjustment temperature tolerance limit when the indoor temperature is under normal load or rated load.

[0079] The air conditioner in this embodiment is divided into high load and low load according to the insulation of the cooling or heating space and the consumption of cooling or heating capacity. Different temperature control is implemented for different load types to prevent large temperature fluctuations caused by frequent and / or excessive over-adjustment or under-adjustment, thereby improving the user experience and reducing energy consumption. In addition, it avoids repeated and frequent start-stop of the unit and extends the life of the unit.

[0080] In some specific embodiments, the outdoor controller 21 is preset to a fixed duration and is configured to acquire the indoor temperature and start timing when the temperature control is stopped, and acquire the indoor temperature again when the timing reaches the fixed duration; calculate the indoor temperature change value at both ends of the fixed duration to characterize the rate of change of indoor temperature; the indoor temperature change rate threshold is the temperature change threshold within the fixed duration.

[0081] The air conditioner in this embodiment simplifies computer control and improves control efficiency.

[0082] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0083] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An air conditioner, comprising at least one indoor unit and an outdoor unit connected thereto; the indoor unit includes an indoor controller and an indoor temperature sensor connected thereto; the outdoor unit includes an outdoor controller and a compressor connected thereto; the compressor is an inverter compressor; the outdoor controller is communicatively connected to each of the indoor controllers; Its features are, From the time the compressor starts until it reaches the set temperature and stops, the indoor controller repeatedly obtains the indoor temperature from the indoor temperature sensor and transmits it to the outdoor controller. The outdoor controller obtains a correction coefficient based on the rate of change of the indoor temperature to adjust the starting frequency of the compressor for the next start. When the compressor starts next, the outdoor controller obtains a target starting frequency, uses the correction coefficient to adjust the target starting frequency to obtain the starting frequency, and uses the starting frequency to control the compressor to start. The indoor controller is configured to acquire the indoor temperature multiple times and transmit it to the outdoor controller starting from the temperature-controlled shutdown. The outdoor controller is configured to define the room load based on the obtained rate of change of each indoor temperature when the compressor stops at the set temperature, and to perform the next temperature-based shutdown control based on the room load; a preset indoor temperature change rate threshold is set, which is a continuous threshold range; when the rate of change of the indoor temperature is not less than the maximum value of the indoor temperature change rate threshold, it is defined as a high load; when the rate of change of the indoor temperature is not greater than the minimum value of the indoor temperature change rate threshold, it is defined as a low load. The outdoor controller has preset temperature tolerance limits, minimum operating frequency, and under-adjustment temperature. The temperature tolerance limit is the maximum value that is allowed to exceed the set temperature positively or negatively; the under-adjustment temperature is the temperature value that negatively exceeds the set temperature but is less than the temperature tolerance limit. The outdoor controller is configured to control the compressor to operate at the minimum operating frequency when the high load is applied, the compressor is running, and the indoor temperature reaches the set temperature again; and to stop the compressor when the indoor temperature is over-adjusted to the temperature tolerance limit; and to switch to normal control when the indoor temperature is under-adjusted to the temperature tolerance limit. When the compressor is running under low load and the indoor temperature reaches the under-adjustment temperature again, the compressor is controlled to operate at the minimum operating frequency. When the indoor temperature is over-adjusted to the temperature tolerance limit, the compressor stops at the temperature limit. When the indoor temperature is under-adjusted to the temperature tolerance limit, the compressor switches to normal control.

2. The air conditioner according to claim 1, characterized in that, The outdoor controller presets a target temperature arrival time and obtains the actual temperature arrival time when it stops operating at the target temperature. This actual temperature arrival time is the operating time of the compressor from startup to its shutdown at the target temperature. The correction factor is obtained based on the ratio of the actual temperature arrival time to the target temperature arrival time.

3. The air conditioner according to claim 2, characterized in that, The target temperature arrival time includes the upper target time and the lower target time. When the actual temperature arrival time is not less than the target upper limit time, the correction coefficient is the ratio of the actual temperature arrival time to the target upper limit time; When the actual temperature arrival time is not greater than the target lower limit time, the correction coefficient is the ratio of the actual temperature arrival time to the target lower limit time; When the actual temperature arrival time is between the target lower limit time and the target upper limit time, the correction coefficient is equal to 1.

4. The air conditioner according to claim 3, characterized in that, The outdoor controller has a preset capability constant and is configured to obtain a corrected capability constant by correcting the capability constant through the correction coefficient; the start frequency is a linear function of the corrected capability constant.

5. The air conditioner according to claim 4, characterized in that, The outdoor controller presets a correction capability constant threshold and is configured to compare the product of the correction coefficient and the capability constant with the correction capability constant threshold. If the product of the correction coefficient and the capability constant is greater than the maximum value of the correction capability constant threshold, then the correction capability constant is equal to the maximum value of the correction capability constant threshold. If the product of the correction coefficient and the capability constant is less than the minimum value of the correction capability constant threshold, then the correction capability constant is equal to the minimum value of the correction capability constant threshold. If the product of the correction coefficient and the capability constant is within the range of the correction capability constant threshold, then the correction capability constant is equal to the product of the correction coefficient and the capability constant.

6. The air conditioner according to any one of claims 2 to 5, characterized in that, The outdoor controller is also configured with a cooling mode and a heating mode, and is configured to control the compressor to start at the target start frequency when the outdoor unit starts after switching between the cooling mode and the heating mode, and to obtain the correction coefficient to correct the start frequency when starting in the same mode next time.

7. The air conditioner according to any one of claims 2 to 5, characterized in that, The outdoor controller is also configured to control the compressor to start at the target starting frequency when the outdoor unit is powered on after a power outage, and to obtain the correction coefficient for correcting the starting frequency when starting in the same mode next time.

8. The air conditioner according to claim 7, characterized in that, The outdoor controller is preset with a fixed duration; when the compressor stops at the set temperature, the indoor temperature is acquired and timed, and the indoor temperature is acquired again when the fixed duration is reached; the rate of change of the indoor temperature is the change value of the indoor temperature over the fixed duration; the threshold for the rate of change of the indoor temperature is a temperature change threshold.

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