Air conditioner

Abstract

Disclosed in the present disclosure is an air conditioner, comprising a compressor (3), which is of a variable-frequency type. The air conditioner further comprises a driver (2), a temperature detection unit (4) and a controller (1), wherein the driver (2) is connected to the compressor (3), and is configured to drive the compressor (3) to operate; the temperature detection unit (4) is connected to the driver (2), and is configured to detect the temperature of the driver (2), which temperature is recorded as an operating temperature; and the controller (1) is respectively connected to the driver (2) and the temperature detection unit (4), is configured with a temperature threshold, and is configured to: cyclically acquire the operating temperature; compare the operating temperature with the temperature threshold; determine whether the operating temperature reaches or exceeds the temperature threshold; and if so, reduce the control frequency of the compressor (3). The present disclosure limits the temperature rise of the driver (2) by means of adjusting the control frequency of the compressor (3), thereby reducing the requirement for a heat dissipation apparatus and the use cost of a direct-current electric motor, further lowering the cost of the air conditioner, and improving the safety and reliability of air conditioner operation.

Description

air conditioner

[0001] This disclosure claims priority to Chinese patent application No. 202411859955.2, filed on December 16, 2024; Chinese patent application No. 202411874805.9, filed on December 18, 2024; and Chinese patent application No. 202411897394.5, filed on December 20, 2024; the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of air conditioning technology, and in particular to an air conditioner. Background Technology

[0003] The maximum operating temperature of a DC (Direct Current) motor with built-in drive is as high as 100℃. In order to ensure the stability and reliability of DC motors, the rated power needs to be increased, resulting in higher application prices and seriously affecting the promotion and application of DC motors in central air conditioning.

[0004] Externalizing the driver can lower the operating temperature, reduce component specifications, and decrease driver cost. However, the driver circuit still suffers from high inverter losses and high temperatures in power devices, leading to increased temperature rise in the electrical box and consequently higher failure rates of electronic components. Using heat sinks for cooling not only increases the cost of the DC fan drive platform but also adds production steps and reduces production efficiency.

[0005] Public content

[0006] This disclosure provides some embodiments to improve the problems of electrical box failure and high operating costs caused by DC motor inverter temperature rise in air conditioners.

[0007] This disclosure provides an air conditioner, including a compressor, which is an inverter type; wherein, the air conditioner further includes:

[0008] A driver, which is connected to the compressor, is configured to drive the compressor to operate;

[0009] A temperature detection unit, which is connected to the driver, is configured to detect the temperature of the driver and record it as the operating temperature;

[0010] A controller, which is connected to the driver and the temperature detection unit respectively, is configured with a temperature threshold and is configured as follows:

[0011] The operating temperature is obtained cyclically;

[0012] Compare the operating temperature with the temperature threshold; determine whether the operating temperature reaches or exceeds the temperature threshold; if so, reduce the control frequency of the compressor.

[0013] In this disclosure, the control frequency of the compressor is the frequency of switching of the switching elements of the control driver; that is, one cycle of the control power supply includes the number of switching cycles of the driver; the duty cycle of the switch is configured to control the voltage and current of the power supply; the number of switches and the switching frequency are configured to control the power supply quality of the power supply.

[0014] The air conditioner disclosed herein changes the switching frequency of the driver by controlling the control frequency of the compressor without changing the duty cycle, thereby reducing the heat generation power of the driver and lowering the operating temperature of the driver. This not only reduces costs by reducing heat dissipation components but also improves the temperature rise guarantee of the driver, thereby improving the stability and reliability of the driver's operation and extending its lifespan. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the composition and connection structure of an air conditioner according to an embodiment.

[0016] Figure 2 is a schematic diagram of the control flow of an air conditioner according to an embodiment.

[0017] Figure 3 is a schematic diagram of the control flow of an air conditioner according to an embodiment.

[0018] Figure 4 is a schematic diagram of the air conditioner's composition and connection structure according to an embodiment.

[0019] Figure 5 is a schematic diagram of the control flow of the air conditioner according to an embodiment.

[0020] Figure 6 is a schematic diagram of the control flow of the air conditioner according to an embodiment.

[0021] Figure 7 is a schematic diagram of the air conditioner's composition and connection structure according to an embodiment.

[0022] Figure 8 is a schematic diagram of the control flow of the air conditioner according to an embodiment.

[0023] Figure 9 is a schematic diagram of the control flow of an air conditioner according to an embodiment.

[0024] Figure 10 is a schematic diagram of the air conditioner's composition and connection structure according to an embodiment.

[0025] Figure 11 is a schematic diagram of the control flow of an air conditioner according to an embodiment.

[0026] Figure 12 is a schematic diagram of the control flow of an air conditioner according to an embodiment.

[0027] Figure 13 is a schematic diagram of the air conditioner composition and connection structure according to an embodiment.

[0028] Figure 14 is a schematic diagram of the control flow of an air conditioner according to an embodiment.

[0029] Figure 15 is a schematic diagram of the control flow of an air conditioner according to an embodiment.

[0030] Figure 16 is a schematic diagram of the air conditioner composition and connection structure according to an embodiment.

[0031] Figure 17 is a schematic diagram of the control flow of an air conditioner according to an embodiment.

[0032] Figure 18 is a schematic diagram of the air conditioner composition and connection structure according to an embodiment.

[0033] Figure 19 is a schematic diagram of the control flow of an air conditioner according to an embodiment.

[0034] Figure 20 is a schematic diagram of the air conditioner composition and connection structure according to an embodiment.

[0035] Figure 21 is a schematic diagram of the control flow of an air conditioner according to an embodiment.

[0036] Figure 22 is a schematic diagram of the composition and connection structure of an air conditioner according to an embodiment.

[0037] Figure 23 is a schematic diagram of the composition and connection structure of an air conditioner according to an embodiment.

[0038] Figure 24 is a schematic diagram of the control flow of an air conditioner according to an embodiment.

[0039] Figure 25 is a schematic diagram of the control flow of an air conditioner according to an embodiment.

[0040] Figure 26 is a schematic diagram of the control flow of an air conditioner according to an embodiment.

[0041] Figure 27 is a schematic diagram of the control flow of an air conditioner according to an embodiment.

[0042] Figure 28 is a schematic diagram of the control flow of an air conditioner according to an embodiment. Detailed Implementation

[0043] 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.

[0044] In some embodiments of this invention, the air conditioner performs a refrigeration cycle using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat an indoor space.

[0045] Low-temperature, low-pressure refrigerant enters the compressor, which compresses it into a high-temperature, high-pressure refrigerant gas and discharges the compressed gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process. The expansion valve causes the high-temperature, high-pressure liquid refrigerant formed in the condenser to expand into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant that has expanded in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves a 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. The outdoor unit of the air conditioner refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of the air conditioner includes the indoor heat exchanger, and the expansion valve can be provided in either the indoor or outdoor unit. 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 is used as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in cooling mode.

[0046] In some embodiments, referring to FIG1, the air conditioner of this disclosure may include a controller 1, a driver 2, and a compressor 3. The compressor 3 may be an inverter type; that is, the air conditioner may include an outdoor unit; the outdoor unit may include an inverter compressor; in other words, the air conditioner of this disclosure may be an inverter air conditioner. The driver 2 is connected to both the compressor 3 and the controller 1. The controller 1 controls the duty cycle of the switch of the driver 2, thereby controlling the amplitude and frequency of the output power supply to power the compressor 3.

[0047] In some embodiments, referring to FIG1, the air conditioner further includes a temperature detection unit 4, which can be connected to the driver 2 and electrically connected to the controller 1. The temperature detection unit 4 is configured to detect the operating temperature of the driver 2 and transmit it to the controller 1.

[0048] In some embodiments, the controller 1 has a preset temperature threshold. Referring to FIG2, the controller 1 is configured to perform the following steps:

[0049] S1. Loop to obtain the operating temperature of driver 2; S2. Compare the operating temperature with the temperature threshold and determine whether the operating temperature has reached or exceeded the temperature threshold; if so, execute S3; S3. Reduce the control frequency of compressor 3.

[0050] In this disclosure, the control frequency of the compressor 3 is the frequency at which the switching elements of the driver 2 are switched; that is, one cycle of the power supply includes the number of switching cycles of the driver 2; the duty cycle of the switch is configured to control the voltage and current of the power supply; and the number of switches and the switching frequency are configured to control the power supply quality.

[0051] The air conditioner disclosed herein changes the switching frequency of the driver 2 by controlling the control frequency of the compressor 3 without changing the duty cycle, thereby reducing the heat generation power of the driver 2 and lowering the operating temperature of the driver 2. This not only reduces costs by reducing heat dissipation components but also improves the temperature rise guarantee of the driver 2, thereby improving the stability and reliability of the driver 2 and extending its lifespan.

[0052] In some embodiments, the controller 1 has a preset proportional threshold that is greater than 1. The controller 1 is configured to control the operating frequency of the compressor 3 and limit the control frequency of the compressor 3 according to the product of the proportional threshold and the operating frequency.

[0053] Referring to Figure 3, the control flow of controller 1 may include the following steps: S11, obtain the operating temperature of driver 2; S21, compare the operating temperature with a temperature threshold, determine whether the operating temperature reaches or exceeds the temperature threshold, and if the operating temperature reaches or exceeds the temperature threshold, execute S41; S41, obtain the operating frequency of compressor 3; compare the control frequency of compressor 3 with the product of proportional threshold and operating frequency, determine whether the control frequency of compressor 3 is not lower than the product of proportional threshold and operating frequency; if yes, execute S31; if no, execute S51; S31, reduce the control frequency for controlling the operation of compressor 3; S51, alarm; that is, perform a temperature control failure alarm.

[0054] In this embodiment, the air conditioner ensures that the control frequency of the compressor 3 is not lower than the product of the proportional threshold and the operating frequency of the compressor 3 by setting a proportional threshold, thereby making the compressor 3 operate reliably and reducing the operating noise of the compressor 3.

[0055] In some embodiments, the controller 1 has a preset proportional threshold of not less than 15. The air conditioner in this embodiment has been experimentally verified to have a proportional threshold of not less than 15, ensuring that the operating noise of the compressor 3 is below the required level. This guarantees the proper functioning of the compressor 3, improves its reliability, and extends its lifespan. Furthermore, reducing operating noise also enhances the user experience.

[0056] In some embodiments, referring to FIG4, the air conditioner of this disclosure may include a controller 1, a driver 2, and a fan 5. The fan 5 may be an inverter type. That is, the air conditioner may include an outdoor unit; the outdoor unit may include the fan 5 and an outdoor heat exchanger; the fan 5 is an inverter type, capable of controlling and changing its speed, and is configured to control the heat exchange efficiency of the outdoor heat exchanger according to the cooling or heating load. The driver 2 is connected to both the fan 5 and the controller 1, and controls the duty cycle of its switch through the controller 1 to output power to supply power to the fan 5.

[0057] In some embodiments, as shown in Figures 4, 5, and 6, the air conditioner further includes a temperature detection unit 4, which is connected to the driver 2 and configured to detect the operating temperature of the driver 2; the temperature detection unit 4 is connected to the controller 1 and transmits the detected operating temperature of the driver 2 to the controller 1.

[0058] In some embodiments, the controller 1 has a preset temperature threshold, as shown in FIG5, and the controller 1 is configured to perform the following steps:

[0059] S1': Loop to obtain the operating temperature of driver 2; S2': Compare the operating temperature with the temperature threshold and determine whether the operating temperature has reached or exceeded the temperature threshold; if so, execute S3'; S3': Reduce the control frequency of fan 5.

[0060] Similarly, the control frequency of the fan 5 is the frequency at which the switching elements of the driver 2 are switched; that is, one cycle of the power supply is the number of switching cycles of the driver 2; the duty cycle of the switch is configured to control the voltage and current of the power supply; the number of switches and the frequency of the switches are configured to control the power supply quality.

[0061] The air conditioner disclosed herein changes the switching frequency of the driver 2 without changing the duty cycle by controlling the control frequency of the fan 5, thereby reducing the heat generation power of the driver 2 and lowering the operating temperature of the driver 2. This not only reduces costs by reducing the number of heat dissipation components for the driver 2, but also improves the temperature rise guarantee of the driver 2, thereby improving the stability and reliability of the driver 2 and extending its lifespan.

[0062] In some embodiments, the controller 1 has a preset proportional threshold greater than 1 and is configured to control the operating frequency of the fan 5, and to limit the control frequency of the fan 5 according to the product of the proportional threshold and the operating frequency.

[0063] Referring to Figure 6, the control flow of controller 1 may include the following steps: S11', obtaining the operating temperature of driver 2; S21', comparing the operating temperature with a temperature threshold, determining whether the operating temperature reaches or exceeds the temperature threshold, and if the operating temperature reaches or exceeds the temperature threshold, executing S41'; S41', obtaining the operating frequency of fan 5; comparing the control frequency of fan 5 with the product of proportional threshold and operating frequency; determining whether the control frequency of fan 5 is not lower than the product of proportional threshold and operating frequency; if yes, executing S31'; if no, executing S51'; S31', reducing the control frequency for controlling the operation of fan 5; S51', alarm; i.e., performing a temperature control failure alarm.

[0064] In this embodiment, the air conditioner ensures that the control frequency of the fan 5 is not lower than the product of the proportional threshold and the operating frequency of the fan 5 by setting a proportional threshold, thereby making the fan 5 operate reliably and reducing the operating noise of the fan 5.

[0065] In some embodiments, the proportional threshold value of controller 1 is not less than 15. The air conditioner in this embodiment has been experimentally verified to have a proportional threshold value not less than 15, ensuring that the operating noise of the fan 5 is below the required level, thereby guaranteeing the operating condition of the fan 5, improving reliability, and extending its lifespan. Furthermore, reducing operating noise enhances the user experience.

[0066] In some embodiments, as shown in FIG7, the air conditioner of this disclosure further includes a current detection unit 6, which is connected to the driver 2 and the controller 1 respectively, and is configured to detect the drive current of the driver 2 and transmit it to the controller 1.

[0067] Controller 1 is preset with temperature threshold and current threshold. Referring to Figure 8, controller 1 is configured to perform the following steps:

[0068] S10. Loop through the operating temperature and drive current of driver 2; S20. Compare the operating temperature with the temperature threshold; determine whether the operating temperature has reached or exceeded the temperature threshold; if yes, execute S30; S30. Compare the drive current with the current threshold; determine whether the drive current has reached or exceeded the current threshold; if yes, execute S40; if no, execute S50; S40. Reduce the control frequency of the power supply for controlling fan 5; S50. Increase the speed of fan 5 to increase airflow and enhance the air cooling of driver 2.

[0069] In this embodiment, the air conditioner determines whether the drive current of the fan 5 has reached its upper limit by using a current threshold. If the current threshold has not been reached, the fan speed can be increased to control and increase airflow, enhance the air cooling of the driver 2, reduce the operating temperature of the driver 2, and ensure the reliable and stable operation of the fan 5. When the current threshold is reached or exceeded, the control frequency of the fan 5 is changed to reduce the operating temperature of the driver 2. While ensuring the operating temperature, the cost can be reduced.

[0070] In some embodiments, referring to FIG9, the controller 1 includes the following steps: S101, cyclically acquiring the operating temperature and drive current of the driver 2; S201, comparing the operating temperature with a temperature threshold; determining whether the operating temperature reaches or exceeds the temperature threshold; if yes, executing S301; S301, comparing the drive current with a current threshold; determining whether the drive current reaches or exceeds the current threshold; if yes, executing S601; if no, executing S501; S601, acquiring the operating frequency of the fan 5; comparing the control frequency of the fan 5 with the product of the proportional threshold and the operating frequency; determining whether the control frequency of the fan 5 is not lower than the product of the proportional threshold and the operating frequency; if yes, executing S401; if no, executing S701; S401, reducing the control frequency of the power supply for controlling the fan 5; S501, increasing the speed of the fan 5 to increase airflow and enhance the air cooling of the driver 2; S701, issuing an alarm for temperature control failure.

[0071] In this embodiment, the air conditioner ensures that the control frequency of the fan 5 is not lower than the product of the proportional threshold and the operating frequency of the fan 5 by setting a proportional threshold, thereby making the fan 5 operate reliably and reducing the operating noise of the fan 5.

[0072] In some embodiments, the current threshold is calculated using a temperature threshold and the power dissipation of the driver 2. That is, the power dissipation of the driver 2 is sufficient to meet the rate of temperature rise of the driver 2, ensuring its operating temperature remains below the temperature threshold. This embodiment of the air conditioner incorporates a current threshold determination to ensure that the operating temperature does not exceed the temperature threshold during normal operation, guaranteeing the normal operating temperature rise of the fan 5 and improving the stability and reliability of the fan 5's operation.

[0073] In some embodiments, referring to FIG10, this disclosure also discloses an air conditioner, which includes an outdoor unit; the outdoor unit includes a controller 1, a first driver 21, a second driver 22, a compressor 3, a first temperature detection unit 41, a second temperature detection unit 42, and a fan 5; the compressor 3 and the fan 5 are both inverter type; that is, the air conditioner is an inverter air conditioner.

[0074] The first driver 21 is connected to both the compressor 3 and the controller 1. The controller 1 controls the first driver 21 to change its duty cycle, thereby changing the frequency of the power supply and causing the compressor 3 to operate at a variable frequency. In other words, the controller 1 controls the first driver 21 to control the compressor 3 to change its operating frequency. The second driver 22 is connected to both the fan 5 and the controller 1. The controller 1 controls the first driver 21 to change its duty cycle, thereby changing the frequency of the power supply and causing the fan 5 to operate at a variable frequency. In other words, the controller 1 controls the second driver 22 to control the fan 5 to change its operating frequency. A first temperature detection unit 41 is connected to the first driver 21 and electrically connected to the controller 1. It is configured to detect the first operating temperature of the first driver 21 and transmit it to the controller 1. A second temperature detection unit 4 is connected to the second driver 22 and electrically connected to the controller 1. It is configured to detect the second operating temperature of the second driver 22 and transmit it to the controller 1.

[0075] In some embodiments, the controller 1 is preset with a first temperature threshold and a second temperature threshold. Referring to FIG11, the controller 1 is configured to perform the following steps: S10', cyclically acquire the first operating temperature and the second operating temperature; S20', compare the first operating temperature with the first temperature threshold and the second operating temperature with the second temperature threshold; determine whether the first operating temperature reaches or exceeds the first temperature threshold and / or whether the second operating temperature reaches or exceeds the second temperature threshold; if so, execute S30'; S30', correspondingly reduce the control frequency of the compressor 3 and / or the control frequency of the fan 5.

[0076] Similarly, the control frequency of compressor 3 and fan 5 is the frequency of switching of the switching components of the first driver 21 and the second driver 22; that is, one cycle of the power supply includes the number of switching cycles of driver 2; the duty cycle of the switch is configured to control the voltage and current of the power supply; the number of switches or the frequency of the switch in one cycle is configured to control the power supply quality.

[0077] The air conditioner disclosed herein changes the switching frequency of the driver 2 without changing the duty cycle by controlling the control frequency of the compressor 3 and / or the fan 5, thereby reducing the heat generation power of the driver 2 and lowering the operating temperature of the driver 2. This not only reduces costs by reducing the number of heat dissipation components for the driver 2, but also improves the temperature rise guarantee of the driver 2, thereby improving the stability and reliability of the driver 2 and extending its lifespan.

[0078] In some embodiments, referring to FIG12, the controller 1 has a preset proportional threshold, which is greater than 1, and the controller 1 includes the following steps:

[0079] S101': Continuously acquire the first operating temperature and the second operating temperature; S201': Compare the first operating temperature with the first temperature threshold and the second operating temperature with the second temperature threshold; determine whether the first operating temperature reaches or exceeds the first temperature threshold and / or whether the second operating temperature reaches or exceeds the second temperature threshold; if yes, execute S301'; S301': Acquire the operating frequency of compressor 3, denoted as the first operating frequency; compare the first control frequency of compressor 3 with the product of the proportional threshold and the first operating frequency; acquire the operating frequency of fan 5, denoted as the second operating frequency; compare the second control frequency of fan 5 with the product of the proportional threshold and the second operating frequency; determine whether the first control frequency of compressor 3 is not lower than the product of the proportional threshold and the first operating frequency and whether the second control frequency of fan 5 is not lower than the product of the proportional threshold and the second operating frequency; if yes, execute S401'; if no, execute S501'; S401': Reduce the first control frequency of compressor 3 and / or the second control frequency of fan 5; S501': Issue a temperature rise control failure alarm.

[0080] Specifically: when the first operating temperature reaches or exceeds the first temperature threshold, a comparison is made between the first control frequency and the product of the proportional threshold and the first operating frequency. If the first control frequency is not less than the product of the proportional threshold and the first operating frequency, the first control frequency is reduced. When the second operating temperature reaches or exceeds the second temperature threshold, a comparison is made between the second control frequency and the product of the proportional threshold and the second operating frequency. If the second control frequency is not less than the product of the proportional threshold and the second operating frequency, the second control frequency is reduced. When both the first and second operating temperatures reach or exceed the first and second temperature thresholds, a comparison is made between the first control frequency and the product of the proportional threshold and the first operating frequency, and between the second control frequency and the product of the proportional threshold and the second operating frequency. If both conditions are met, and the first control frequency is not less than the product of the proportional threshold and the first operating frequency, and the second control frequency is not less than the product of the proportional threshold and the second operating frequency, the first and second control frequencies are reduced. Otherwise, if one or both conditions are not met, a temperature control failure alarm is triggered.

[0081] In this embodiment, the air conditioner sets a limiting relationship between a first control frequency and a first operating frequency, and a limiting relationship between a second control frequency and a second operating frequency to ensure the quality of the power supply.

[0082] In some embodiments, referring to FIG13, the outdoor unit may further include a current detection unit 6, which is connected to the second driver 22 and the controller 1 respectively, and is configured to detect the drive current of the second driver 22 and transmit it to the controller 1. The controller 1 has a preset current threshold, and referring to FIG14, the controller 1 is configured to perform the following steps:

[0083] S100: Loop through the acquisition of the first operating temperature, the second operating temperature, and the drive current; S200: Compare the first operating temperature with a first temperature threshold and the second operating temperature with a temperature threshold; determine whether the first operating temperature exceeds the first temperature threshold and / or whether the second operating temperature exceeds the second temperature threshold; if yes, proceed to S300; S300: Compare the drive current with a current threshold; determine whether the drive current reaches or exceeds the current threshold; if yes, proceed to S400; if no, proceed to S500; S400: Correspondingly reduce the first control frequency of the compressor 3 and / or the second control frequency of the fan 5; S500: Increase the speed of the fan 5. This enhances airflow for cooling the first driver 21 and / or the second driver fan 22.

[0084] In some embodiments, referring to FIG15, controller 1 is further preset with a proportional threshold greater than 1, and controller 1 is configured to perform the following steps:

[0085] S1001: Cyclicly acquire the first operating temperature, the second operating temperature, and the drive current;

[0086] S2001. Compare the first operating temperature with the first temperature threshold and the second operating temperature with the temperature threshold; determine whether the first operating temperature is not lower than the first temperature threshold and / or whether the second operating temperature is not lower than the second temperature threshold; if yes, then execute S3001.

[0087] S3001. Compare the drive current with the current threshold; determine whether the drive current is not lower than the current threshold; if yes, execute S6001; if no, execute S5001.

[0088] S6001: Obtain the first operating frequency and the second operating frequency; compare the first control frequency and the product of the proportional threshold and the first operating frequency, and the second control frequency and the product of the proportional threshold and the second operating frequency; determine whether the control frequency of the compressor 3 is not lower than the product of the proportional threshold and the first operating frequency and / or whether the control frequency of the fan 5 is not lower than the product of the proportional threshold and the second operating frequency; if yes, execute S4001; if no, execute S7001.

[0089] S5001, Increase the fan speed by 5. Improve airflow for air cooling of the first drive 21 and / or the second drive 22;

[0090] S4001, correspondingly reduce the first control frequency of the compressor 3 and / or the second control frequency of the fan 5;

[0091] S7001, Temperature rise control failure alarm.

[0092] In some implementation schemes, because the outdoor air conditioning unit is placed outdoors for extended periods, the surface of its heat exchanger inevitably becomes covered with dust or particulate matter, which affects the operation of the fan, most notably its impact on the airflow. The uneven distribution of dust or particulate matter causes the airflow from the dual-fan outdoor unit to the outdoor heat exchanger to become uneven, resulting in uneven heat exchange and reduced heat exchange efficiency.

[0093] To address the issue of uneven airflow from a dual-fan outdoor unit to the outdoor heat exchanger due to dust or particulate matter, which leads to uneven heat exchange and reduced efficiency, this disclosure provides an air conditioner in several embodiments. The air conditioner may include an outdoor unit. Referring to FIG16, the outdoor unit includes a first fan 51, a second fan 52, and an outdoor heat exchanger. The first fan 51 and the second fan 52 exchange heat with the outdoor heat exchanger. The outdoor unit also includes a first speed detection unit 71 and a second speed detection unit 72, which are connected to the first fan 51 and the second fan 52, respectively, and are configured to detect the first speed of the first fan 51 and the second speed of the second fan 52, respectively.

[0094] In some embodiments, the first speed detection unit 71 and the second speed detection unit 72 may be integrally configured with the first fan 51 and the second fan 52, respectively. That is, the first fan 51 includes the first speed detection unit 71; the second fan 52 includes the second speed detection unit 72; or the first fan 51 includes a speed detection unit for detecting the first speed; and the second fan 52 includes a speed detection unit for detecting the second speed.

[0095] In some embodiments, the outdoor unit may further include a controller 1, which is connected to the first fan 51, the second fan 52, the first speed detection unit 71, and the second speed detection unit 72 respectively. The controller is configured with a function of air volume and speed, and is configured to: allocate air volume to the first fan 51 and the second fan 52 according to the required air volume and the structure of the outdoor heat exchanger; and adjust the speed of the first fan 51 and the second fan 52 according to the function of air volume and speed to ensure balanced air volume.

[0096] In some embodiments, referring to FIG17, the control of the first fan 51 and the second fan 52 by the controller 1 includes the following steps:

[0097] S01. Obtain the required air volume and allocate the air volume according to the parameters of the outdoor heat exchanger stored in the controller 1; that is, allocate the first fan 51 to supply the first air volume and the second fan 52 to supply the second air volume; the sum of the first air volume and the second air volume is the required air volume, in other words, allocate the first air volume and the second air volume according to the required components; S02. Obtain the first preset speed and the second preset speed according to the function of air volume and speed and the first air volume and the second air volume; that is, substitute the first air volume into the function of air volume and speed to obtain the speed value as the first preset speed, and the first preset speed is configured to control the operation of the first fan 51; substitute the second air volume into the function of air volume and speed to obtain the speed value as the second preset speed, and the second preset speed is configured to control the operation of the second fan 52; S03. Control the first fan 51 to operate at the first preset speed, and control the second fan 52 to operate at the first preset speed. S04. The fan 52 operates at a second preset speed. The first speed detected by the first speed detection unit 71 and the second speed detected by the second speed detection unit 72 are obtained, which are the real-time speeds of the first fan 51 and the second fan 52, respectively. S05. The first actual air volume and the second actual air volume are obtained according to the function of the first speed, the second speed, and the air volume with the speed, which are the current real-time air volumes of the first fan 51 and the second fan 52. That is, the air volume obtained by substituting the function of the air volume with the speed into the first speed is the first actual air volume; the air volume obtained by substituting the function of the air volume with the speed into the second speed is the second actual air volume. S06. The first actual air volume is compared with the first air volume, and the second actual air volume is compared with the second air volume. Based on the comparison results, the first speed and the second speed are adjusted so that the first actual air volume is equal to the first air volume, and the second actual air volume is equal to the second air volume.

[0098] The air conditioner disclosed herein allocates air volume to the corresponding first fan 51 and second fan 52 according to the structural parameters of the outdoor heat exchanger. It obtains the first actual air volume and the second actual air volume according to the function of air volume and speed, the first speed, and the second speed. It adjusts the first speed and the second speed according to the results of comparing the first actual air volume and the second actual air volume with the allocated first air volume and the second air volume, so that the first actual air volume and the second actual air volume tend to be equal to the first air volume and the second air volume, respectively. This ensures and maintains the air volume configuration of the first fan 51 and the second fan 52, thereby ensuring the heat exchange air volume of the outdoor heat exchanger and improving the heat exchange efficiency.

[0099] In some embodiments, the first rotation speed, the second rotation speed, the first actual air volume, and the second actual air volume need to be obtained multiple times, and the first rotation speed and the second rotation speed are adjusted based on multiple cyclic comparisons of the first actual air volume with the first air volume and the second actual air volume with the second air volume to obtain the first actual air volume with the first air volume and the second actual air volume with the second air volume.

[0100] Specifically, when the first actual air volume is greater than the first air volume, the controller 1 can control the reduction of the first speed; when the second actual air volume is greater than the second air volume, the controller 1 can control the reduction of the second speed; when the first actual air volume is less than the first air volume (S13), the controller 1 can control the increase of the first speed; when the second actual air volume is less than the second air volume, the controller 1 can control the increase of the second speed; when the first actual air volume is equal to the first air volume and the second actual air volume is equal to the second air volume, the controller 1 can control the first fan 51 to maintain the first speed and the second fan 52 to maintain the second speed.

[0101] Of course, the comparison between the first actual air volume and the second actual air volume can be carried out by hysteresis or threshold method to prevent overshoot of the first speed and the second speed and reduce the adjustment frequency of the first speed and the second speed, thereby improving the stability and reliability of operation.

[0102] In some embodiments, the controller 1 is configured to allocate a first air volume equal to a second air volume, wherein the first air volume and the second air volume are each half of the required air volume. That is, equal air volumes are allocated to the first fan 51 and the second fan 52 to ensure uniform heat exchange in the outdoor heat exchanger and improve heat exchange efficiency.

[0103] The air conditioner in this embodiment has a first fan 51 and a second fan 52 with the same parameters and a symmetrical outdoor heat exchanger, which simplifies the control of the first fan 51 and the second fan 52 and improves the control efficiency and the heat exchange efficiency of the outdoor heat exchanger.

[0104] In some embodiments, referring to Figures 18 and 22, the outdoor unit further includes a first power detection unit 81 and a second power detection unit 82, which are respectively connected to the first fan 51, the second fan 52, and the controller 1. The first power detection unit 81 is configured to detect the power of the first fan 51 and transmit it to the controller 1, and the first power detection unit 81 is also configured to detect the power of the second fan 52 and transmit it to the controller 1. That is, the first power detection unit 81 is connected to the first fan 51 and the controller 1 respectively, and can transmit the detected first power of the first fan 51 to the controller 1; the second power detection unit 82 is connected to the second fan 52 and the controller 1 respectively, and can transmit the detected second power of the second fan 52 to the controller 1.

[0105] In some embodiments, the controller 1 is configured with a function of rotational speed and rated power, which is obtained by fitting the corresponding power values ​​measured when the outdoor unit's fan is running at multiple constant speeds.

[0106] In some embodiments, referring to FIG19, controller 1 is configured to perform the following steps:

[0107] S07. Obtain the first rotational speed, the second rotational speed, the first power, and the second power; S08. Obtain the first rated power and the second rated power based on the first rotational speed, the second rotational speed, and the function of rotational speed and rated power; that is, substitute the first rotational speed into the function of rotational speed and rated power to obtain the first rated power; substitute the second rotational speed into the function of rotational speed and rated power to obtain the second rated power; S09. Obtain the first shading coefficient based on the first rated power and the first power; obtain the second shading coefficient based on the second rated power and the second power; S010. Correct the first air volume and the second air volume respectively using the first shading coefficient and the second shading coefficient. The shading coefficient represents the shading area or resistance parameter of the outdoor heat exchanger; the larger the shading coefficient, the more shading occurs, and the greater the resistance.

[0108] The air conditioner in this embodiment takes into account the resistance or degree of obstruction of the outdoor heat exchanger by correcting the distribution of the first and second air volumes through the obstruction coefficient. This ensures that the air volume passing through the outdoor heat exchanger is not affected by the resistance or degree of obstruction, or reduces the impact of the resistance and obstruction, making the heat exchange of the outdoor heat exchanger more balanced and improving its heat exchange efficiency.

[0109] In some embodiments, the first power detection unit 81 and the second power detection unit 82 may be current detection units. The first power detection unit 81 detects the operating current of the first fan 51 and transmits it to the controller 1. The second power detection unit 82 detects the operating current of the second fan 52 and transmits it to the controller 1. The controller 1 calculates the first power and the second power based on the operating current and operating voltage of the first fan 51 and the second fan 52.

[0110] In some embodiments, the first shading factor may be equal to the ratio of the first power to the first rated power; the second shading factor may be equal to the ratio of the second power to the second rated power. That is: the first shading factor is equal to the first power divided by the first rated power; the second shading factor is equal to the second power divided by the second rated power.

[0111] In some embodiments, the controller 1 can periodically acquire a first shading coefficient and a second shading coefficient for adjusting the first air volume and the second air volume; that is, by cyclically acquiring the first rated power and the second rated power corresponding to the first speed and the second speed, and periodically acquiring the first power and the second power, the controller 1 can periodically obtain the first shading coefficient and the second shading coefficient, continuously adjust the first air volume and the second air volume, maintain the heat exchange balance of the outdoor heat exchanger, and thus maintain and improve the heat exchange efficiency.

[0112] In some embodiments, the controller 1 can adjust the first air volume and the second air volume by using the first shading coefficient and the second shading coefficient, respectively.

[0113] Specifically, for the first fan 51, the control process of the controller 1 may include: comparing the ratio of the first actual air volume to the first shading coefficient with the first air volume; if the ratio of the first actual air volume to the first shading coefficient exceeds the first air volume, then reducing the speed of the first fan 51; if the ratio of the first actual air volume to the first shading coefficient does not exceed the first air volume, then determining whether the ratio of the first actual air volume to the first shading coefficient is lower than the first air volume; if yes, then increasing the speed of the first fan 51; if no, then maintaining the speed of the first fan 51.

[0114] Specifically, for the second fan 52, the control process of the controller 1 may include: comparing the ratio of the second actual air volume and the second shading coefficient with the second air volume; if the ratio of the second actual air volume and the second shading coefficient exceeds the second air volume, then reducing the speed of the second fan 52; if the ratio of the second actual air volume and the second shading coefficient does not exceed the second air volume, then determining whether the ratio of the second actual air volume and the second shading coefficient is lower than the second air volume; if yes, then increasing the speed of the second fan 52; if no, then maintaining the speed of the second fan 52.

[0115] In this embodiment, the air conditioner adjusts the first speed of the first fan 51 and the second speed of the second fan 52 by comparing the ratio of the first actual air volume to the first shading coefficient with the first air volume, and the ratio of the second actual air volume to the second shading coefficient with the second air volume. This includes the air volume heat exchange loss caused by resistance or shading in the required air volume, ensuring that the outdoor heat exchanger with shading or resistance has the required heat exchange capacity, thereby improving the air conditioner's capacity and efficiency.

[0116] In some embodiments, the function of airflow and rotational speed is specifically a linear function of airflow as the product of rotational speed and quadrature-axis current; that is: Q=K*r*i q Where Q is the air volume; K is the coefficient; r is the rotational speed; i q The cross-axis current is the air volume. The air volume is a linear function of the product of the rotational speed and the cross-axis current, obtained through the kinetic energy formula, Bates' law, and the torque formula.

[0117] Specifically, according to the kinetic energy formula, the kinetic energy of a wind turbine is: Ek = 1 / 2mV 2 Substituting m = pAV*t into the above equation, we get Ek = 1 / 2ρAtV 3 ;

[0118] Where V is wind speed, in m / s; ρ is air density, with a value of 1.225 kg / m³. 3 A is the area through which the wind passes within a given time period, in square meters (m²). 2 m is the mass of air passing through, measured in kg; t is the time, measured in seconds.

[0119] Power refers to the amount of wind energy that can be utilized per unit time, or it can be defined as the amount of wind energy passing through a certain area per unit time. Based on the above definition, the power of usable wind energy is: P = 1 / 2ρAV 3 According to Bates' law, the maximum power that the wind turbine can absorb is: Pf max = 8 / 27ρAV 3 Combined with the formula Q=k*V 3 Therefore, Q = k' * P f max; k' is the coefficient between air volume and power; P f max is the fan power.

[0120] Due to the law of conservation of energy, the power of the fan and the power of the motor are approximately equivalent: Pfmax = Pmmax, where Pmmax is the motor power. From the motor torque formula, we can obtain: Pmmax = Km*i q *r; Combining the formulas Pfmax=Pmmax and Q=k'*Pfmax, Q=Km*k'*i q *r; that is, the air volume is a linear function of the product of the rotational speed and the quadrature-axis current.

[0121] In some embodiments, when the first fan 51 and the second fan 52 are of the same model, the first proportional coefficient of the linear function of the first fan 51 is equal to the second proportional coefficient of the linear function of the second fan 52.

[0122] The air conditioner in this embodiment simplifies the calculation of air volume, improves the efficiency of air volume calculation and control, and thus improves the balance and stability of the air volume output by the first fan 51 and the second fan 52.

[0123] In some embodiments, referring to FIG20, the outdoor unit may further include a first driver 21, a second driver 22, a first temperature detection unit 41, and a second temperature detection unit 42. The first driver 21 and the second driver 22 are respectively connected to the controller 1, the first fan 51, and the second fan 52. The first driver 21 is configured to drive the first fan 51, and the second driver 22 is configured to drive the second fan 52; that is, the first driver 21 is connected to both the controller 1 and the first fan 51, and the controller 1 controls the operation of the first fan 51. The first driver 21 is a power heating device. The second driver 22 is connected to both the controller 1 and the second fan 52, and the controller 1 controls the operation of the second fan 52. The second driver 22 is also a power heating device. The first temperature detection unit 41 is connected to both the first driver 21 and the controller 1, and is configured to detect the first temperature of the first driver 21 and transmit the first temperature to the controller 1. The second temperature detection unit 42 is connected to both the first driver 21 and the controller 1, and is configured to detect the second temperature of the second driver 22 and transmit the second temperature to the controller 1.

[0124] In some embodiments, controller 1 is configured with a temperature threshold, and as shown in FIG21, controller 1 is configured to perform the following steps:

[0125] S051. Obtain the first temperature and the second temperature; S052. Compare the first temperature and the second temperature with the temperature threshold; S053. Determine whether the first temperature and / or the second temperature have reached or exceeded the temperature threshold; When the first temperature exceeds the temperature threshold or the second temperature exceeds the temperature threshold, execute S054; S054. Adjust the speed of the first fan 51 according to the first temperature; Adjust the speed of the second fan 52 according to the second temperature.

[0126] In this embodiment, when the first temperature and the second temperature exceed the temperature threshold, the air conditioner adjusts the first speed by adjusting the first temperature and the second speed by adjusting the second temperature, thereby cooling the first driver 21 and the second driver 22 to meet the operating requirements and improve the reliability and lifespan of the first driver 21 and the second driver 22.

[0127] In some embodiments, the controller 1 is configured to: if a first temperature reaches or exceeds a temperature threshold, calculate the difference between the first temperature and the temperature threshold, and record it as a first temperature difference; correct the first rotational speed according to the first temperature difference; if a second temperature reaches or exceeds a temperature threshold, calculate the difference between the second temperature and the temperature threshold, and record it as a second temperature difference; correct the second rotational speed according to the second temperature difference.

[0128] Specifically, for the first fan 51, the control flow of controller 1 is as follows: determine whether the first temperature has reached or exceeded the temperature threshold; if so, obtain the first temperature difference, which is equal to the difference between the first temperature and the temperature threshold; then, adjust the first speed of the first fan 51 according to the first temperature difference. For the second fan 52, the control flow of controller 1 is as follows: determine whether the second temperature has reached or exceeded the temperature threshold; if so, obtain the second temperature difference, which is equal to the difference between the second temperature and the temperature threshold; then, adjust the second speed of the second fan 52 according to the second temperature difference.

[0129] The air conditioner in this embodiment improves the accuracy of correction by correcting the first speed and the second speed using the first temperature difference and the second temperature difference.

[0130] In some embodiments, the controller 1 may be configured with a PI control module, which has a proportional coefficient and an integral coefficient, i.e., a proportional gain and an integral gain. Based on this, the controller 1 may be configured to: input a first temperature difference into the PI control module, and output a first adjustment parameter; input a second temperature difference into the PI control module, and output a second adjustment parameter; the first adjustment parameter and the second adjustment parameter are used to adjust the speed of the first fan 51 and the second fan 52, respectively.

[0131] For the first fan 51, the control flow of controller 1 may include: determining whether a first temperature has reached or exceeded a temperature threshold; if so, obtaining a first temperature difference, which is equal to the difference between the first temperature and the temperature threshold; then, obtaining a first adjustment parameter based on the first temperature difference and the PI control module; and then, controlling the rotational speed of the first fan 51 to increase the first adjustment parameter. For the second fan 52, the control flow of controller 1 is as follows: determining whether a second temperature has reached or exceeded a temperature threshold; if so, obtaining a second temperature difference, which is equal to the difference between the second temperature and the temperature threshold; then, obtaining a second adjustment parameter based on the second temperature difference and the PI control module; and then, controlling the rotational speed of the second fan 52 to increase the second adjustment parameter.

[0132] In this embodiment, the air conditioner obtains the first adjustment parameter and the second adjustment parameter from the first temperature difference and the second temperature difference through the PI control module, thereby reducing oscillation and improving control efficiency. This enables the first temperature and the second temperature to reach the temperature threshold required for reliable operation of the first driver 21 and the second driver 22 as soon as possible, thereby improving the stability and reliability of the operation of the first fan 51 and the second fan 52.

[0133] In some embodiments, the method for adjusting the rotational speed of the first fan 51 by means of the first adjustment parameter is to increase the first adjustment; the method for adjusting the rotational speed of the second fan 52 by means of the second adjustment parameter is to increase the second adjustment parameter.

[0134] The air conditioner in this embodiment further improves the accuracy of the first speed and the second speed by using the first correction parameter and the second correction parameter, thereby improving the stability and reliability of the first driver 21 and the second driver 22 and extending their lifespan.

[0135] In some embodiments of this disclosure, the operation of the brushless DC motor is divided into two processes: open-loop startup and closed-loop speed control. The open-loop process is further divided into a positioning (DC excitation) stage and a forced-drive stage. During the positioning stage, DC current is applied to the motor, fixing it at the "zero" position. Then, the forced-drive stage begins; a rotating magnetic field (ω) is forcibly applied, causing the rotor to rotate following the magnetic field. Once the set minimum initial speed is reached, closed-loop control is initiated. In closed-loop control, the motor operates in accordance with the position signal; however, the rotation of the motor in the open loop is independent of the position signal. Therefore, the open-loop startup of the brushless DC motor is crucial; if the motor cannot be positioned during the positioning stage, the startup is very likely to fail.

[0136] In typical applications, the rotor of a brushless DC motor is stationary, allowing for direct open-loop starting. However, for fan motors, especially those used outdoors, the rotor may not be stationary during startup due to external wind force. The motor already has an initial speed, and applying DC current for positioning at this point makes it difficult to fix the rotor, leading to a failed start due to loss of synchronization.

[0137] To address the problem of outdoor fans failing to start due to rotor instability caused by external wind forces, some embodiments of this disclosure provide an air conditioner. This air conditioner includes an outdoor unit. Referring to Figure 23, the outdoor unit may include an outdoor fan 9, configured to enhance airflow through an outdoor heat exchanger to dissipate heat or cool the heat exchanger, causing condensation or evaporation. The outdoor unit may also include a controller 1, which is communicatively and electrically connected to the outdoor fan 9 to control its start-up and operation.

[0138] In some embodiments, the outdoor fan 9 includes a brushless DC motor, whose operation is divided into two processes: open-loop start-up and speed closed-loop control. The open-loop process is further divided into a positioning (DC excitation) stage and a forced-drive stage. During the positioning stage, DC power is supplied to the motor, fixing it at the "zero" position. Then, in the forced-drive stage, a rotating magnetic field (ω) is forcibly applied, causing the rotor to rotate following the magnetic field. When the set minimum initial speed is reached, closed-loop control is initiated. In closed-loop control, the motor operates in conjunction with a position signal, while the rotation of the open-loop motor is independent of the position signal. The position signal of the brushless DC motor is provided by a position sensor or software position detection technology. The outdoor fan 9 of the air conditioner disclosed herein uses sensorless detection technology to provide the motor position signal.

[0139] In some embodiments, the outdoor unit may further include a speed detection module 2, which can be connected to the outdoor fan 9 and the controller 1. The speed detection module 2 is configured to detect the real-time speed of the outdoor fan 9 and transmit it to the controller 1.

[0140] Controller 1 is configured to perform the following steps:

[0141] S001. Determine whether to start the outdoor fan 9; if yes, proceed to S002; S002. Obtain the real-time speed of the outdoor fan 9; the starting of the outdoor fan 9 here includes the starting of the outdoor fan 9 when the air conditioner is turned on and the situation where the outdoor fan 9 stops and restarts during the operation of the air conditioner; S003. Determine whether the real-time speed is in reverse; if yes, proceed to S004; S004. Configure different starting currents according to the value of the real-time speed and cyclically obtain the real-time speed of the outdoor fan 9; S005. Determine whether the real-time speed is in a stationary state; if yes, proceed to S006; S006. Stationary start; stationary start includes rotor positioning of the outdoor fan 9 and strong drag acceleration; rotor positioning of the outdoor fan 9 is achieved by providing positioning current; strong drag acceleration is achieved by providing strong drag current.

[0142] The air conditioner disclosed herein configures the starting current according to the real-time speed value if the real-time speed is a negative value during startup, so that the outdoor fan 9 can quickly reach a stationary state in reverse, thereby improving startup efficiency and startup success rate, and reducing energy consumption.

[0143] In some embodiments, the controller 1 presets a strong headwind state, a weak headwind state, a stationary state, and a tailwind state, which are sequentially adjacent speed ranges. The speed in the strong headwind state and the weak headwind state is negative; the speed in the tailwind state is positive; the stationary state includes negative speed, positive speed, and zero speed, which is used to determine whether the real-time speed detected for the first time at startup is in a reverse state.

[0144] In some embodiments, the controller 1 is configured to: upon startup, acquire the real-time rotational speed; determine whether the real-time rotational speed is in a strong headwind state; if it is in a strong headwind state, configure the startup current according to a first method; if it is not in a strong headwind state, determine whether the real-time rotational speed is in a weak headwind state; if it is in a weak headwind state, configure the startup current according to a second method; if it is not in a weak headwind state, determine whether the real-time rotational speed is in a stationary state; if it is in a stationary state, start from a stationary position.

[0145] In this embodiment, the air conditioner divides the reversal of the outdoor fan 9 into strong backwind state and weak backwind state, and configures the starting current according to the first method and the second method respectively. This does not increase the complexity of control, and the starting current is configured according to the strength level of the real-time speed, thereby improving the control efficiency and starting efficiency.

[0146] In some embodiments, the controller 1 is preset with a maximum reverse speed, a first maximum starting current, and a starting current corresponding to the low-speed endpoint speed in strong headwind and weak headwind states.

[0147] Referring to Figures 23 and 25, controller 1 is configured to perform the following steps:

[0148] S0041. Upon startup, obtain the real-time rotational speed;

[0149] S0042. Determine if the real-time speed is under strong headwind conditions; if yes, proceed to S43; if no, proceed to S44.

[0150] S0043. Configure the starting current isref = (n1-n) / (n1-nmax1)*(isrefmax1–isref1)+isref1;

[0151] S0044. Determine if the real-time speed is under weak headwind conditions; if yes, proceed to S45; if no, proceed to S46.

[0152] S0045. Configure the starting current isref = (n2-n) / (n2–n1)*(isref1–isref2)+isref2;

[0153] S0046. Determine if the real-time rotation speed is stationary; if so, execute S47.

[0154] S0047, Start from a standstill.

[0155] Wherein, Isref is the starting current; isrefmax1 is the first maximum starting current, which corresponds to the maximum starting current allowed during reverse start; nmax1 is the maximum reverse speed, which is the maximum speed allowed for reverse start, and is a negative value, i.e., the minimum allowable speed in real time; n1 is the low speed endpoint in strong headwind state, and isref1 is the starting current corresponding to n1; n2 is the low speed endpoint in weak headwind state, and isref2 is the starting current corresponding to n2.

[0156] In this embodiment, the air conditioner is preset to start in a strong backwind state with a starting current that varies linearly with the real-time speed. It also presets the highest reverse speed and its corresponding first maximum starting current, the lowest speed endpoint in a strong backwind state and its corresponding starting current, and the lowest speed endpoint in a weak backwind state and its corresponding starting current. The system segments the strong and weak backwind state regions and determines the linear functions for the starting current in both states. The starting current is determined based on these linear functions, ensuring that one real-time speed corresponds to one starting current, resulting in greater targeting and adaptability, and improved starting efficiency and success rate.

[0157] In some embodiments, the controller 1 has a preset observation duration, which limits the observation length when the real-time speed is detected for the first time during startup, thereby improving the accuracy of real-time speed detection and thus improving the startup success rate. The controller 1 is configured to: determine whether the outdoor fan 9 has failed to start; if so, control the outdoor fan 9 to start a second time.

[0158] In some embodiments, referring to FIG26, the secondary start-up of the outdoor fan 9 specifically includes the following steps:

[0159] S0081. Obtain the corrected observation duration, which is equal to the product of 1 minus the difference between the real-time speed at the last startup and the ratio of the highest reverse speed, and the observation duration; that is, the corrected observation duration is obtained by correcting the observation duration based on the ratio of the real-time speed at the last startup to the highest reverse speed; the real-time speed at the last startup is the real-time speed obtained during startup for configuring startup current detection; S0082. Detect the real-time speed; S0083. Determine whether the detection duration has reached the corrected observation duration; if yes, proceed to S0084; if no, proceed to S0082;

[0160] S0084, Output real-time speed; S0085, Configure starting current to control the start of outdoor fan 9 according to real-time speed.

[0161] In this embodiment, the air conditioner corrects the observation time for restarting by adjusting the real-time speed of the unit after a failed start-up, thereby improving the accuracy of real-time speed detection and increasing the start-up success rate.

[0162] In some embodiments, as shown in FIG23, the outdoor unit further includes a current detection unit 10, which is connected to the controller 1. The current detection unit 10 is configured to detect the current of the outdoor fan 9 and transmit it to the controller 1.

[0163] In some embodiments, the controller 1 is preset with a current threshold. The controller 1 is configured to: determine whether the outdoor motor is started; if so, acquire the current; then compare the current with the current threshold; determine whether the current reaches or exceeds the current threshold; if it reaches or exceeds the current threshold, stop starting; if it is lower than the current threshold, acquire the real-time speed; then control the outdoor fan 9 to start according to the real-time speed.

[0164] In this embodiment, the air conditioner performs current detection before obtaining the real-time speed of the outdoor fan 9 when it starts; it determines whether the speed of the outdoor fan 9 before starting exceeds the maximum reverse speed; if it exceeds the maximum reverse speed, it does not perform real-time speed detection, thus protecting the speed detection module from damage, improving startup safety and reducing maintenance costs.

[0165] In some embodiments, referring to FIG23, the outdoor unit further includes a speed detection module 7, which is connected to the outdoor fan 9 and the controller 1. The speed detection module 7 detects the real-time speed of the outdoor fan 9 and transmits it to the controller 1.

[0166] In some embodiments, referring to FIG27, controller 1 is configured to perform the following steps:

[0167] S001' Determine whether to control the outdoor fan 9 to start; if yes, execute S002'; S002' Obtain the real-time speed of the outdoor fan 9; the start of the outdoor fan 9 here includes the start of the outdoor fan 9 when the air conditioner is turned on and the situation where the outdoor fan 9 stops and restarts during the operation of the air conditioner.

[0168] S003' Configure different starting currents according to the real-time speed value and cyclically obtain the real-time speed of the outdoor fan 9.

[0169] Specifically, when the outdoor fan 9 is rotating in reverse, it is slowed down to a stop by the starting current, and then the outdoor fan 9 is controlled to start from a standstill. The standstill start includes rotor positioning of the outdoor fan 9 and strong drag acceleration; rotor positioning of the outdoor fan 9 is achieved by providing positioning current; strong drag acceleration is achieved by providing strong drag current.

[0170] The air conditioner disclosed herein configures the starting current according to the real-time speed value during startup, so that the outdoor fan 9 can quickly reach a stationary state in reverse rotation, thereby improving startup efficiency and startup success rate and reducing energy consumption. Furthermore, when rotating with the wind, the starting current is directly used to accelerate startup, thereby improving startup efficiency.

[0171] In some embodiments, the controller 1 is preset with strong headwind state, weak headwind state, stationary state, weak tailwind state, and strong tailwind state, which are sequentially adjacent speed ranges. The speed in strong headwind state and weak headwind state is negative; the speed in strong tailwind state and weak tailwind state is positive; the stationary state includes negative speed, positive speed and zero speed, which is used to determine the state when the outdoor fan 9 is started.

[0172] In some embodiments, the controller 1 is configured to: acquire the real-time rotational speed when the outdoor fan 9 starts; determine whether the real-time rotational speed is in a strong headwind state; if it is in a strong headwind state, configure the starting current according to a first method; if it is not in a strong headwind state, determine whether the real-time rotational speed is in a weak headwind state; if it is in a weak headwind state, configure the starting current according to a second method; if it is not in a weak headwind state, determine whether the real-time rotational speed is in a stationary state; if it is in a stationary state, configure the starting current according to a third method; if it is not in a stationary state, determine whether the real-time rotational speed is in a weak tailwind state; if it is in a weak tailwind state, configure the starting current according to a fourth method; if it is not in a weak tailwind state, determine whether the real-time rotational speed is in a strong tailwind state; if it is in a strong tailwind state, configure the starting current according to a fifth method. Of course, when the outdoor fan 9 is in a reverse strong headwind state, a weak headwind state, or a stationary state, the outdoor fan 9 is stopped by configuring the starting current, and then the rotor of the outdoor fan 9 is positioned and started. When the outdoor fan 9 is in a forward strong tailwind state or a weak tailwind state, the starting current is directly configured to forcefully increase the rotational speed for starting.

[0173] In this embodiment, the air conditioner divides the reversal of the outdoor fan 9 into strong backwind state, weak backwind state, stationary state, weak tailwind state, and strong tailwind state, and configures the starting current according to the first mode, the second mode, the third mode, and the fourth mode respectively. This does not increase the complexity of control, and the starting current is configured according to the strength of the real-time speed, thereby improving control efficiency and starting efficiency and reducing power consumption.

[0174] In some embodiments, the controller 1 is preset with the maximum reverse speed, the first maximum starting current, the maximum forward speed, the second maximum starting current, and the starting current corresponding to the low speed endpoint in strong headwind and weak headwind states, the forward speed endpoint in stationary state, and the high speed endpoint in weak tailwind state.

[0175] Based on this, referring to Figure 29, controller 1 is configured to perform the following steps:

[0176] S0041' Obtain the real-time speed when the outdoor fan 9 starts;

[0177] S0042' Determine if the real-time speed is under strong headwind conditions; if yes, proceed to S0043'; if no, proceed to S0044'.

[0178] S0043', Configure the starting current isref=(n1-n) / (n1-nmax1)*(isrefmax1–isref1)+isref1;

[0179] S0044' Determine if the real-time speed is in a weak headwind state; if yes, proceed to S0045'; if no, proceed to S0046'.

[0180] S0045', Configure the starting current isref = (n2-n) / (n2–n1)*(isref1–isref2)+isref2;

[0181] S0046' Determine if the real-time rotational speed is stationary; if yes, proceed to S0047'; if no, proceed to S0048'.

[0182] S0047', Configure the starting current Isref = (isref2 + isref3) / 2;

[0183] S0048' Determine if the real-time speed is in a weak tailwind state; if yes, proceed to S0049'; if no, proceed to S0040;

[0184] S0049', Configure the starting current Isref=(n-n3) / (n4–n3)*(isref4–isref3)+isref3;

[0185] S0040, Determine if the real-time speed is under strong tailwind conditions; if so, execute S0040';

[0186] S0040', Configure the starting current Isref=(n-n4) / (nmax2–n4)*(isrefmax2–isref4)+isref4.

[0187] Wherein, Isref is the starting current; isrefmax1 is the first maximum starting current, which corresponds to the maximum starting current allowed during reverse start; nmax1 is the maximum reverse speed, which is the maximum speed allowed during reverse, and is a negative value, i.e., the minimum allowable speed in real time; isrefmax2 is the second maximum starting current, which corresponds to the maximum starting current allowed during forward start; nmax2 is the maximum forward speed, which is the maximum allowable speed in forward rotation, and is a positive value, i.e., the maximum allowable speed in real time; n1 is the low speed endpoint in strong headwind state, and isref1 is the starting current corresponding to n1; n2 is the low speed endpoint in weak headwind state, and isref2 is the starting current corresponding to n2; n3 is the low speed endpoint in weak tailwind state, and isref3 is the starting current corresponding to n3; n4 is the low speed endpoint in strong tailwind state, and isref4 is the starting current corresponding to n4.

[0188] Of course, strong headwind, weak headwind, stationary, weak tailwind, and strong tailwind can be judged in either a forward or reverse order.

[0189] In this embodiment, the air conditioner is pre-set to have starting currents that change linearly with real-time speed in strong backwind and weak backwind conditions. It also pre-sets the highest reverse speed and its corresponding first maximum starting current, the lowest speed endpoint in strong backwind and its corresponding starting current, and the lowest speed endpoint in weak backwind and its corresponding starting current. The system segments the strong and weak backwind regions and determines the linear functions for the starting currents in both conditions. The starting current is determined based on these linear functions, ensuring that one starting current corresponds to one real-time speed, resulting in greater targeting and adaptability, and improved starting efficiency and success rate.

[0190] Similarly, the starting current in the stationary, weak tailwind, and strong tailwind states varies linearly with the real-time speed. By using the two endpoint speeds and their corresponding starting currents in the stationary state, the two endpoint speeds and their corresponding starting currents in the weak tailwind state, the low-speed endpoint speed and its corresponding starting current in the strong tailwind state, and the highest positive speed and the second maximum starting current, a linear function of the stationary, weak tailwind, and strong tailwind state regions can be obtained. This makes each real-time speed correspond to a starting current, which is more targeted and adaptable, improving starting efficiency and success rate.

[0191] In some embodiments, the first maximum starting current is equal to the second maximum starting current; the absolute value of the reverse maximum speed is equal to the positive maximum speed.

[0192] 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.

[0193] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. An air conditioner, comprising a compressor, wherein the compressor is an inverter type; wherein, The air conditioner also includes: A driver, which is connected to the compressor, is configured to drive the compressor to operate; A temperature detection unit, which is connected to the driver, is configured to detect the temperature of the driver and record it as the operating temperature; A controller, which is connected to the driver and the temperature detection unit respectively, is configured with a temperature threshold and is configured as follows: The operating temperature is obtained cyclically; Compare the operating temperature with the temperature threshold; determine whether the operating temperature reaches or exceeds the temperature threshold; if so, reduce the control frequency of the compressor.

2. The air conditioner according to claim 1, wherein, The controller is also configured to control the operating frequency of the compressor; The controller has a preset proportional threshold, which is greater than 1, and the controller is configured such that the control frequency is not lower than the product of the proportional threshold and the operating frequency.

3. An air conditioner, comprising an outdoor unit, which includes a fan; said fan is an inverter type; wherein, The air conditioner also includes: A driver, which is connected to the fan, is configured to drive the fan to operate; A temperature detection unit, which is connected to the driver, is configured to detect the temperature of the driver and record it as the operating temperature; A controller, which is connected to the driver and the temperature detection unit respectively, is configured with a temperature threshold and is configured as follows: The operating temperature is obtained cyclically; Compare the operating temperature with the temperature threshold; determine whether the operating temperature exceeds the temperature threshold; if so, reduce the control frequency of the fan.

4. The air conditioner according to claim 3, wherein, The air conditioner also includes: A current detection unit, which is connected to the driver, is configured to detect the drive current; The controller is connected to the current detection unit and is also configured with a current threshold. The controller is configured to: The operating temperature and the drive current are obtained cyclically. Determine whether the operating temperature exceeds the temperature threshold; if so, compare the drive current with the current threshold. Determine whether the drive current exceeds the current threshold; if so, reduce the control frequency of the fan; if not, increase the speed of the fan.

5. The air conditioner according to claim 4, wherein, The controller is also configured to control the operating frequency of the fan; The controller has a preset proportional threshold, which is greater than 1, and the controller is configured such that the control frequency is not lower than the product of the proportional threshold and the operating frequency.

6. An air conditioner, wherein, This includes the outdoor unit, which comprises a compressor and a fan; The compressor and the fan are inverter type; wherein, the air conditioner further includes: A first driver is connected to the compressor and configured to drive the compressor to operate; A second driver is connected to the fan and configured to drive the fan to operate; A first temperature detection unit is connected to the first driver and configured to detect the temperature of the first driver, which is denoted as the first operating temperature. The second temperature detection unit is connected to the second driver and is configured to detect the temperature of the second driver, which is denoted as the second operating temperature. A current detection unit, which is connected to the second driver, is configured to detect the drive current; A controller, which is connected to the first driver, the second driver, the first temperature detection unit, the second temperature detection unit, and the current detection unit, is configured with a current threshold and a temperature threshold, and is configured as follows: The first operating temperature, the second operating temperature, and the drive current are obtained cyclically. Determine whether the first operating temperature and / or the second operating temperature exceed the temperature threshold; if so, compare the drive current with the current threshold. Determine whether the drive current exceeds the current threshold; if so, reduce the first control frequency of the first driver and / or the second control frequency of the second driver accordingly; if not, control the fan speed to increase.

7. The air conditioner according to claim 6, wherein, The controller is also configured to control a first operating frequency of the compressor and a second operating frequency of the fan. The controller has a preset proportional threshold, which is greater than 1, and is configured such that the first control frequency is not lower than the product of the proportional threshold and the first operating frequency; and the second control frequency is not lower than the product of the proportional threshold and the second operating frequency.

8. The air conditioner according to claim 2, 5 or 7, wherein, The value of the ratio threshold is not less than 15.

9. An air conditioner, wherein, Includes an outdoor unit; the outdoor unit includes a first fan, a second fan, and an outdoor heat exchanger; the first fan and the second fan exchange heat for the outdoor heat exchanger; The outdoor unit also includes: A first speed detection unit is connected to the first fan and is configured to detect a first speed. The second speed detection unit is connected to the second fan and is configured to detect the second speed. A controller, which is connected to the first speed detection unit, the second speed detection unit, the first fan, and the second fan respectively, is configured with a function relating airflow and speed, and is configured as follows: The first air volume and the second air volume are allocated to the first fan and the second fan according to the required air volume; The first preset speed and the second preset speed are obtained based on the function of air volume and rotation speed, as well as the first air volume and the second air volume, to control the operation of the first fan and the second fan. Obtain the first rotational speed and the second rotational speed; obtain the first actual air volume and the second actual air volume based on the first rotational speed, the second rotational speed, and the function of the air volume and rotational speed; Compare the first actual air volume with the first air volume, and the second actual air volume with the second air volume, and adjust the speed of the first fan and the second fan according to the comparison results.

10. The air conditioner according to claim 9, wherein, The outdoor unit also includes: A first power detection unit is connected to the first fan and the controller respectively, and is configured to detect the first power of the first fan and transmit it to the controller; The second power detection unit is connected to the second fan and the controller respectively, and is configured to detect the second power of the second fan and transmit it to the controller; The controller is configured with a function of rotational speed and rated power, and is configured as follows: Obtain the first rotational speed, the second rotational speed, the first power, and the second power; The first rated power and the second rated power are obtained as a function of the first rotational speed, the second rotational speed, and the rotational speed and the rated power. A first shading coefficient is obtained based on the first rated power and the first power; a second shading coefficient is obtained based on the second rated power and the second power; The first air volume and the second air volume are adjusted by the first shading coefficient and the second shading coefficient, respectively.

11. The air conditioner according to claim 10, wherein, The first shading coefficient is equal to the ratio of the first power to the first rated power; the second shading coefficient is equal to the ratio of the second power to the second rated power.

12. The air conditioner according to claim 10, wherein, Adjusting the first air volume and the second air volume by using the first shading coefficient and the second shading coefficient respectively includes: The ratio of the first actual air volume to the first shading coefficient is compared with the first air volume, and the ratio of the second actual air volume to the second shading coefficient is compared with the second air volume. The speed of the first fan and the second fan is adjusted according to the comparison results.

13. The air conditioner according to any one of claims 9 to 12, wherein, The controller is configured as follows: The first air volume is equal to the second air volume, and the first air volume and the second air volume are each equal to half of the required air volume.

14. The air conditioner according to any one of claims 9 to 12, wherein, The air volume is a linear function of the product of the rotational speed and the quadrature-axis current; when the first fan and the second fan are of the same model, the first proportional coefficient of the linear function of the first fan is equal to the second proportional coefficient of the linear function of the second fan.

15. The air conditioner according to any one of claims 9 to 12, wherein, The outdoor unit also includes: A first driver is connected to the controller and the first fan respectively, and is configured to drive the first fan; The second driver is connected to the controller and the second fan respectively, and is configured to drive the second fan; A first temperature detection unit is connected to a first driver and the controller, respectively, and is configured to detect a first temperature of the first driver and transmit it to the controller; The second temperature detection unit is connected to the second driver and the controller respectively, and is configured to detect the second temperature of the second driver and transmit it to the controller; The controller is configured with a temperature threshold and is configured as follows: Obtain the first temperature and the second temperature; The first temperature, the second temperature, and the temperature threshold are compared; and when the first temperature and / or the second temperature exceeds the temperature threshold, the rotation speeds of the first fan and the second fan are adjusted according to the first temperature and the second temperature, respectively.

16. The air conditioner according to claim 15, wherein, The controller is also configured to: If the first temperature reaches or exceeds the temperature threshold, calculate the difference between the first temperature and the temperature threshold, and record it as the first temperature difference; adjust the speed of the first fan according to the first temperature difference; If the second temperature reaches or exceeds the temperature threshold, calculate the difference between the second temperature and the temperature threshold, and record it as the second temperature difference; adjust the speed of the second fan according to the second temperature difference.

17. The air conditioner according to claim 16, wherein, The controller is equipped with a PI control module, which has a proportional coefficient and an integral coefficient. The controller is configured as follows: When the first temperature difference and the second temperature difference are input respectively, the first adjustment parameter and the second adjustment parameter are output respectively; The first adjustment parameter and the second adjustment parameter respectively adjust the speed of the first fan and the second fan.

18. The air conditioner according to claim 17, wherein, The first adjustment parameter and the second adjustment parameter respectively adjust the speed of the first fan and the second fan, respectively increasing the speed of the first fan by the first adjustment parameter and the speed of the second fan by the second adjustment parameter.

19. An air conditioner, wherein, Includes an outdoor unit; the outdoor unit includes: Outdoor fans, which include DC brushless motors; A controller, which is connected to the outdoor fan and controls the start-up and operation of the outdoor fan; A speed detection module is connected to the outdoor fan and the controller respectively, and is configured to detect the real-time speed of the outdoor fan and transmit it to the controller; The controller is configured as follows: When controlling the outdoor fan to start, its real-time speed is first obtained; Determine whether the real-time rotation speed is in reverse; if so, configure different starting currents according to the value of the real-time rotation speed and cyclically obtain the real-time rotation speed of the outdoor fan. Determine whether the real-time rotation speed has reached a stationary state; if so, control the outdoor fan to start from a standstill.

20. The air conditioner according to claim 19, wherein, The controller has preset strong headwind, weak headwind, stationary, and tailwind states, which are sequentially connected speed ranges; the speeds in the strong headwind and weak headwind states are all negative; the speeds in the tailwind state are all positive; and the stationary state includes negative speeds, positive speeds, and zero speeds. The controller is configured as follows: Based on the real-time rotational speed obtained before startup, determine its status; When the real-time rotational speed is in the strong headwind state or the weak headwind state, different acquisition methods are used to determine the starting current.

21. The air conditioner according to claim 20, wherein, The controller is preset with a maximum reverse speed, a first maximum starting current, and starting currents corresponding to the low-speed endpoint speeds in the strong headwind state and the low-speed endpoint speeds in the weak headwind state. The controller is configured as follows: At startup, determine the status of the real-time rotational speed; If it is a strong headwind condition, isref = (n1-n) / (n1-nmax1)*(isrefmax1–isref1)+isref1; If it is a weak headwind condition, isref = (n2-n) / (n2–n1)*(isref1–isref2)+isref2; Wherein, Isref is the starting current; isrefmax1 is the first maximum starting current; nmax1 is the highest reverse speed; n1 is the low-speed endpoint of the strong headwind state, and isref1 is the starting current corresponding to n1; n2 is the low-speed endpoint of the weak headwind state, and isref2 is the starting current corresponding to n2.

22. The air conditioner according to claim 21, wherein, The controller is preset with an observation duration; The controller is configured as follows: If the outdoor fan fails to start, it shall be controlled to start again. Obtain the corrected observation duration, which is equal to the product of 1 minus the difference between the ratio of the real-time rotational speed at the last startup to the highest reverse rotational speed and the observation duration; The rotational speed detection module is controlled to observe the corrected observation duration to obtain the real-time rotational speed; The outdoor fan is started based on the real-time rotation speed.

23. The air conditioner according to any one of claims 19 to 21, wherein, The outdoor unit also includes a current detection unit configured to detect the current of the outdoor fan; The controller is connected to the current detection unit, has a preset current threshold, and is configured as follows: When the outdoor fan starts, the current is first obtained; Compare the current with the current threshold; If the current reaches or exceeds the current threshold, the outdoor fan is controlled to stop starting; if the current does not reach the current threshold, the speed detection module is controlled to obtain the real-time speed.

24. An air conditioner, wherein, Includes an outdoor unit; the outdoor unit includes: Outdoor fans, which include DC brushless motors; A controller, which is connected to the outdoor fan, controls the start-up and operation of the outdoor fan; The speed detection module is connected to the outdoor fan and the controller respectively, and is configured to detect the real-time speed of the outdoor fan and transmit it to the controller; The controller is configured as follows: When the outdoor fan is started, its real-time rotational speed is obtained; The outdoor fan is started by configuring different starting currents based on the real-time rotational speed value.

25. The air conditioner according to claim 24, wherein, The controller has preset strong headwind, weak headwind, stationary, weak tailwind, and strong tailwind states, which are sequentially connected speed ranges; the speeds in the strong headwind and weak headwind states are both negative; the speeds in the strong tailwind and weak tailwind states are both positive; the stationary state includes negative speed, positive speed, and zero speed. The controller is configured as follows: When the outdoor fan is started, the real-time rotational speed is obtained; its status is determined. The starting current is obtained in different ways depending on the different states of the real-time rotation speed.

26. The air conditioner according to claim 25, wherein, The controller is preset with a maximum reverse speed, a first maximum starting current, a maximum forward speed, a second maximum starting current, and starting currents at the endpoints of each speed range. The controller is configured as follows: At startup, determine the status of the real-time rotational speed; If it is a strong headwind condition, isref = (n1-n) / (n1-nmax1)*(isrefmax1–isref1)+isref1; If it is a weak headwind condition, isref = (n2-n) / (n2–n1)*(isref1–isref2)+isref2; If it is in the static state, isref = (isref2 + isref3) / 2; If it is the weak tailwind condition, isref = (n-n3) / (n4–n3)*(isref4–isref3)+isref3; If it is the strong tailwind state, isref = (n-n4) / (nmax2–n4)*(isrefmax2–isref4)+isref4; where Isref is the starting current; isrefmax1 is the first maximum starting current; nmax1 is the highest reverse speed; isrefmax2 is the second maximum starting current; nmax2 is the highest forward speed; n1 is the low-speed endpoint of the strong headwind state, and isref1 is the starting current corresponding to n1; n2 is the low-speed endpoint of the weak headwind state, and isref2 is the starting current corresponding to n2; n3 is the low-speed endpoint of the weak tailwind state, and isref3 is the starting current corresponding to n3; n4 is the low-speed endpoint of the strong tailwind state, and isref4 is the starting current corresponding to n4.

27. The air conditioner according to claim 26, wherein, The controller is preset with an observation duration; The controller is configured as follows: If the outdoor fan fails to start, it shall be controlled to start again. The corrected observation duration is obtained, which is equal to 1 minus the product of the ratio of the real-time rotation speed at the last startup to the highest reverse rotation speed and the observation duration. The rotational speed detection module is controlled to observe the corrected observation duration to obtain the real-time rotational speed; The outdoor fan is started based on the real-time rotation speed.

28. The air conditioner according to any one of claims 24 to 27, wherein, The outdoor unit also includes a current detection unit configured to detect the current of the outdoor fan; The controller is connected to the current detection unit, has a preset current threshold, and is configured as follows: When the outdoor fan starts, the current is first obtained; Compare the current with the current threshold; If the current reaches or exceeds the current threshold, the outdoor fan is controlled to stop starting; if the current does not reach the current threshold, the speed detection module is controlled to obtain the real-time speed.

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