Air conditioner and cold air prevention control method thereof

Abstract

The application provides an air conditioner and a cold air prevention control method thereof. The cold air prevention control method comprises the following steps: receiving a control instruction for operating in a heating mode, monitoring an indoor coil temperature, an outdoor environment temperature and an instantaneous value of an outdoor unit current; during operation of an indoor fan, when the indoor coil temperature is less than or equal to a first critical temperature, determining whether the outdoor environment temperature is less than or equal to a preset temperature threshold and whether the instantaneous value of the outdoor unit current is greater than or equal to a preset current threshold; if the outdoor environment temperature is less than or equal to the preset temperature threshold and the instantaneous value of the outdoor unit current is greater than or equal to the preset current threshold, the indoor fan is controlled to operate at a preset speed. The application has the advantage that compressor protection shutdown caused by sudden stop of the indoor fan when the indoor coil temperature is low can be avoided.

Description

Technical Field

[0001] This invention relates to the field of air conditioning, and in particular to an air conditioner and a method for controlling cold airflow therefrom. Background Technology

[0002] In traditional heating mode, the air conditioner often starts the indoor fan immediately after being turned on to blow air. Unfortunately, at this time, the indoor coil has not yet accumulated enough heat and the temperature is low, resulting in the blown air being not hot enough. Users feel cold air or insufficiently warm air, which affects the heating experience and comfort.

[0003] To address this issue, the heating-and-cool-air-prevention technology was developed. This technology stops the indoor fan from blowing air at the beginning of heating, and only starts it again to blow out hot air after the system has stored heat and the indoor coil temperature has risen to the specified temperature. This ensures that users can immediately enjoy warm and comfortable air.

[0004] However, in low-temperature heating environments, the heating capacity is limited due to the generally low indoor and outdoor temperatures. If the indoor fan operates at a high speed, it will accelerate the flow of indoor air, thereby accelerating the heat loss from the indoor coils, causing the coil temperature to drop, and may even blow cold air. In this situation, if the indoor fan is turned off directly, it will cause drastic changes in the pressure and temperature of the refrigerant inside the system, resulting in a large fluctuation in the instantaneous value of the total current of the outdoor unit, which may even exceed the protection threshold and trigger the compressor's protective shutdown mechanism. Summary of the Invention

[0005] One objective of this invention is to avoid the problem of the compressor triggering protection shutdown when the indoor fan suddenly stops when the indoor coil temperature is low.

[0006] A further objective of this invention is to rationally control the operation of the indoor fan based on the indoor coil temperature, thereby avoiding frequent adjustments to the indoor fan speed.

[0007] Specifically, according to a first aspect of the present invention, the present invention provides a method for controlling cold air in an air conditioner, comprising:

[0008] Upon receiving a control command to operate in heating mode, it monitors the indoor coil temperature, outdoor ambient temperature, and instantaneous value of the outdoor unit current.

[0009] During the operation of the indoor fan, when the indoor coil temperature is detected to be less than or equal to the first critical temperature, it is determined whether the outdoor ambient temperature is less than or equal to a preset temperature threshold and whether the instantaneous value of the outdoor unit current is greater than or equal to a preset current threshold.

[0010] If the outdoor ambient temperature is less than or equal to a preset temperature threshold, and the instantaneous value of the outdoor unit current is greater than or equal to a preset current threshold, the indoor fan is controlled to run at a preset speed.

[0011] Optionally, the step of controlling the internal fan to operate at a preset speed at a reduced speed includes:

[0012] During the deceleration process, if the indoor coil temperature is continuously lower than the first critical temperature, the indoor fan will be controlled to continue to decelerate until it stops.

[0013] Optionally, the step of controlling the internal fan to operate at a preset speed at a reduced speed includes:

[0014] During the deceleration process, if the indoor coil temperature is detected to be greater than or equal to the second critical temperature, the indoor fan is controlled to run at a preset fan speed.

[0015] The second critical temperature is greater than the first critical temperature.

[0016] Optionally, after receiving the control command to operate in heating mode, the method further includes:

[0017] The indoor fan is kept off to allow the indoor coil to store heat.

[0018] Optionally, after the step of maintaining the shutdown state of the internal fan, the method further includes:

[0019] If the indoor coil temperature is detected to be greater than or equal to the second critical temperature and less than the third critical temperature, the indoor fan is started and controlled to run at a preset first wind speed.

[0020] The first critical temperature, the second critical temperature, and the third critical temperature increase sequentially.

[0021] Optionally, after the step of controlling the internal fan to operate at a preset first wind speed, the method further includes:

[0022] If the indoor coil temperature is detected to be greater than or equal to the third critical temperature and less than the fourth critical temperature, the indoor fan is controlled to run at the preset second wind speed.

[0023] Wherein, the fourth critical temperature is greater than the third critical temperature, and the second wind speed is greater than the first wind speed.

[0024] Optionally, after the step of controlling the internal fan to operate at a preset second wind speed, the method further includes:

[0025] If the indoor coil temperature is detected to be greater than or equal to the fourth critical temperature, the indoor fan is controlled to run at the preset third wind speed.

[0026] The third wind speed is greater than the second wind speed.

[0027] Optionally, after the step of controlling the internal fan to operate at a preset third wind speed, the method further includes:

[0028] If the indoor coil temperature is detected to be greater than the second critical temperature and less than or equal to the third critical temperature, the indoor fan is controlled to resume operation at the second fan speed.

[0029] Optionally, after the step of controlling the internal fan to resume operation at the second wind speed, the method further includes:

[0030] If the indoor coil temperature is detected to be greater than the first critical temperature and less than or equal to the second critical temperature, the indoor fan is controlled to resume operation at the first fan speed.

[0031] According to a second aspect of the present invention, an air conditioner is provided, comprising:

[0032] The indoor unit is equipped with an indoor coil temperature sensor;

[0033] The outdoor unit, which is communicatively connected to the indoor unit, is equipped with an outdoor ambient temperature sensor and an outdoor unit current detection circuit; and

[0034] The controller includes a memory and a processor, wherein the memory stores a machine-executable program, which, when executed by the processor, is used to implement the anti-cold air control method described in any one of the above.

[0035] The anti-cold air control method for air conditioners of the present invention, upon receiving a control command to operate in heating mode, monitors the indoor coil temperature, outdoor ambient temperature, and instantaneous outdoor unit current. During the operation of the indoor fan, if the indoor coil temperature is detected to be less than or equal to a first critical temperature, it further determines whether the outdoor ambient temperature is less than or equal to a preset temperature threshold and whether the instantaneous outdoor unit current is greater than or equal to a preset current threshold. If the outdoor ambient temperature is less than or equal to the preset temperature threshold and the instantaneous outdoor unit current is greater than or equal to the preset current threshold, the indoor fan is controlled to reduce its speed at a preset rate. This prevents drastic fluctuations in the instantaneous outdoor unit current caused by a sudden stop of the indoor fan, potentially exceeding the safety protection range and triggering automatic compressor shutdown, thus helping to maintain the compressor's operational stability and safety.

[0036] Furthermore, the anti-cold air control method for the air conditioner of the present invention, after maintaining the indoor fan in a stopped state, continuously monitors the temperature change of the indoor coil. Once the indoor coil temperature rises to the second critical temperature (this temperature is higher than the first critical temperature but lower than the third critical temperature), the indoor fan is automatically started and controlled to run at a preset first fan speed. This allows for more reasonable regulation of the indoor fan's operation. This not only ensures a stable rise in the indoor coil temperature, avoiding excessive temperature fluctuations that could cause discomfort to the user, but also effectively reduces frequent adjustments to the indoor fan speed, thereby improving the overall operating efficiency and stability of the system.

[0037] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0038] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0039] Figure 1 This is a schematic flowchart of an air conditioner's anti-cold air control method according to an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram illustrating the operation of an internal fan according to an embodiment of the present invention;

[0041] Figure 3 This is a schematic structural diagram of an air conditioner according to an embodiment of the present invention.

[0042] Figure label:

[0043] 10. Air conditioner; 110. Indoor unit; 111. Indoor coil temperature sensor; 120. Outdoor unit; 121. Outdoor ambient temperature sensor; 122. Outdoor unit current detection circuit; 130. Controller; 131. Memory; 132. Processor; 133. Machine-executable program. Detailed Implementation

[0044] Reference will now be made in detail to embodiments of the invention, one or more of which are illustrated in the accompanying drawings. The various embodiments provided are intended to explain the invention and not to limit it. In fact, various modifications and variations to the invention will be apparent to those skilled in the art without departing from the scope or spirit of the invention. For example, a feature illustrated or described as part of one embodiment may be used with another embodiment to produce yet another embodiment. Therefore, the invention is intended to cover such modifications and variations within the scope of the appended claims and their equivalents.

[0045] In the description of this embodiment, it should be understood that the term "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.

[0046] In the description of this embodiment, the terms "one embodiment," "some embodiments," "some examples," "one example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0047] The present invention provides a method for controlling cold air in an air conditioner 10. The air conditioner 10 can be a split-type air conditioner 10, which includes an indoor unit 110 and an outdoor unit 120. The indoor unit 110 and the outdoor unit 120 work together to provide a comfortable indoor environment for the user.

[0048] Figure 1 This is a schematic flowchart of an air conditioner 10's anti-cold air control method according to an embodiment of the present invention, as shown below. Figure 1 As shown, the control method includes at least the following steps S102 to S106.

[0049] Step S102: Receive the control command to operate in heating mode, and monitor the indoor coil temperature, outdoor ambient temperature, and instantaneous value of outdoor unit current.

[0050] When the air conditioner 10 receives the control command for the heating mode, the system begins to monitor the indoor coil temperature, the outdoor ambient temperature, and the instantaneous value of the outdoor unit current. These parameters are important bases for determining whether the air conditioner 10 is in anti-cold air mode and for adjusting the operating status of the indoor fan.

[0051] Step S104: During the operation of the indoor fan, when the indoor coil temperature is detected to be less than or equal to the first critical temperature, it is determined whether the outdoor ambient temperature is less than or equal to the preset temperature threshold and whether the instantaneous value of the outdoor unit current is greater than or equal to the preset current threshold.

[0052] During indoor fan operation, if the indoor coil temperature is detected to be less than or equal to the first critical temperature, it indicates that the indoor coil temperature is low and there is a risk of direct cold air blowing. The system will further determine whether the outdoor ambient temperature is less than or equal to a preset temperature threshold and whether the instantaneous value of the outdoor unit current is greater than or equal to a preset current threshold. These two conditions are used to determine whether the air conditioner 10 is in a low-temperature heating mode or a high-load operation state, so as to take appropriate measures to prevent cold air.

[0053] Step S106: If the outdoor ambient temperature is less than or equal to the preset temperature threshold and the instantaneous value of the outdoor unit current is greater than or equal to the preset current threshold, control the indoor fan to run at a preset speed.

[0054] When the outdoor ambient temperature is less than or equal to the preset temperature threshold, and the instantaneous value of the outdoor unit current is greater than or equal to the preset current threshold, it indicates that the air conditioner 10 is in a low-temperature heating and high-load operation state. If the indoor fan continues to run at the original fan speed at this time, it may cause cold air to blow directly on the unit. Therefore, the system will control the indoor fan to run at a preset speed to reduce the risk of cold air blowing directly on the unit. This also prevents the instantaneous value of the outdoor unit current from fluctuating drastically due to a sudden compressor stop, which could cause it to exceed the safety protection range and trigger the compressor's automatic protection shutdown. This helps maintain the stability and safety of the compressor's operation.

[0055] In one optional embodiment, the step of controlling the indoor fan to reduce its speed at a preset rate includes: during the speed reduction process, if the indoor coil temperature is detected to be continuously lower than the first critical temperature, controlling the indoor fan to continue to reduce its speed until it stops.

[0056] If the indoor coil temperature remains below the first critical temperature during the speed reduction process, it indicates that the heating effect is poor. Continuing to reduce the speed can decrease the risk of direct cold air blasting, until the indoor fan stops operating completely. This measure helps protect users from the effects of direct cold air blasting under extreme low temperature and high load conditions.

[0057] In an optional embodiment, the step of controlling the indoor fan to operate at a preset speed includes: during the speed reduction process, if the indoor coil temperature is detected to be greater than or equal to a second critical temperature, then controlling the indoor fan to operate at a preset wind speed, wherein the second critical temperature is greater than the first critical temperature.

[0058] During the cooling process, if the indoor coil temperature is detected to be greater than or equal to the second critical temperature (and greater than the first critical temperature), it indicates that the heating effect has improved, and the indoor fan can be started or resumed. The system will control the indoor fan to operate at a preset fan speed to provide suitable warm air output. This measure helps to improve user comfort while ensuring heating performance.

[0059] In an alternative embodiment, after receiving a control command to operate in heating mode, the indoor fan can be kept off to allow the indoor coil to store heat.

[0060] Upon receiving the control command for heating mode, the system can initially keep the indoor fan off for a period of time to allow the indoor coils to store heat. This helps raise the initial temperature of the indoor coils and reduces the risk of direct cold air blowing. During heat storage, the system can continue to monitor parameters such as the indoor coil temperature, outdoor ambient temperature, and instantaneous outdoor unit current to activate the indoor fan at the appropriate time.

[0061] In one optional embodiment, after maintaining the indoor fan in a stopped state, if the indoor coil temperature is detected to be greater than or equal to the second critical temperature and less than the third critical temperature, the indoor fan can be started, and then the indoor fan can be controlled to run at a preset first fan speed. The first critical temperature, second critical temperature, and third critical temperature increase sequentially.

[0062] After keeping the indoor fan off for a period of time, if the indoor coil temperature is monitored to be greater than or equal to the second critical temperature and less than the third critical temperature, it indicates that the heating effect has basically stabilized. At this point, the indoor fan can be started and operated at the preset first fan speed. The first fan speed can be set according to actual needs to provide suitable warm air output. This measure helps to ensure heating effect while improving user comfort.

[0063] In one optional embodiment, after controlling the indoor fan to operate at a preset first fan speed, if the indoor coil temperature is detected to be greater than or equal to a third critical temperature and less than a fourth critical temperature, the indoor fan can be controlled to operate at a preset second fan speed. Wherein, the fourth critical temperature is greater than the third critical temperature, and the second fan speed is greater than the first fan speed.

[0064] After the indoor fan runs at the first fan speed for a period of time, if the indoor coil temperature is detected to be greater than or equal to the third critical temperature and less than the fourth critical temperature, it indicates that the heating effect is already very good, and the fan speed can be further increased to increase the warm air output. The system will then control the indoor fan to run at a preset second fan speed, which is greater than the first fan speed, to provide a stronger warm air output.

[0065] In one optional embodiment, after controlling the indoor fan to operate at a preset second fan speed, if the indoor coil temperature is detected to be greater than or equal to a fourth critical temperature, the indoor fan is controlled to operate at a preset third fan speed. The third fan speed is greater than the second fan speed.

[0066] After the indoor fan operates at the second fan speed for a period of time, if the indoor coil temperature is detected to be greater than or equal to the fourth critical temperature, it indicates that the heating effect has reached its optimal state. The fan speed can then be further increased to provide a more powerful output of warm air. The system will then control the indoor fan to operate at a preset third fan speed, which is greater than the second speed. This measure helps to quickly raise the indoor temperature in cold weather, improving user comfort.

[0067] In one optional embodiment, after controlling the indoor fan to run at a preset third fan speed, if the indoor coil temperature is detected to be greater than the second critical temperature and less than or equal to the third critical temperature, the indoor fan is controlled to run at the second fan speed again.

[0068] After the indoor fan has been running at the third fan speed for a period of time, if the indoor coil temperature drops to a range greater than the second critical temperature but less than or equal to the third critical temperature, it indicates that the indoor ambient temperature is at a relatively high level, and the air conditioner 10 has already released sufficient heat to the indoor environment, making it unnecessary to continue operating at the third fan speed. Therefore, the system will control the indoor fan to resume operation at the second fan speed. This measure helps to maintain a stable indoor temperature while improving the energy efficiency ratio of the air conditioner 10.

[0069] In one alternative embodiment, after the indoor fan is controlled to run at the second fan speed again, if the indoor coil temperature is detected to be greater than the first critical temperature and less than or equal to the second critical temperature, the indoor fan is controlled to run at the first fan speed again.

[0070] After the indoor fan operates at the second fan speed for a period of time, if the indoor coil temperature drops to a range greater than the first critical temperature but less than or equal to the second critical temperature, it indicates that the heating effect is at a relatively low level, but it can still meet the user's heating needs. In fact, at this point, the indoor temperature has already stabilized at a relatively high level, and even if the fan speed is reduced, the air blown out will still be warm. Therefore, the system controls the indoor fan to resume operation at the first fan speed. This measure helps to maintain a stable indoor temperature while further improving the energy efficiency ratio of the air conditioner 10 and the user's comfort.

[0071] Figure 2 This is a schematic diagram illustrating the operation of an internal fan according to an embodiment of the present invention, as shown below. Figure 2As shown, based on the temperature changes of the indoor coil, the operation of the indoor fan is divided into seven stages for fine-tuning control. Each stage corresponds to different temperature and fan speed settings to achieve the optimal heating effect.

[0072] In this embodiment, the first critical temperature, the second critical temperature, the third critical temperature, and the fourth critical temperature increase sequentially. Wherein,

[0073] First critical temperature: Set to a value between 15℃ and 30℃, such as 20℃. This temperature marks the initial stage of heating, when the indoor coil begins to accumulate heat.

[0074] Second critical temperature: Set to a value between 20℃ and 30℃, such as 25℃. When the indoor coil temperature reaches this value, it indicates that the heat storage stage has ended and the system is ready to enter the initial heating stage.

[0075] The third critical temperature is set to a value between 25°C and 35°C, such as 30°C. This temperature marks a key point for improving heating efficiency, and the indoor fan needs to increase its speed to enhance the heating effect.

[0076] Fourth critical temperature: Set to a value between 30℃ and 40℃, such as 35℃. When this temperature is reached, the system enters the high-efficiency heating stage, ensuring that the indoor ambient temperature quickly reaches the user's set value.

[0077] The first, second, and third wind speeds increase sequentially.

[0078] First fan speed: This can be a low setting, suitable for the initial heating stage or when the indoor temperature is close to the set temperature, in order to reduce energy consumption and noise.

[0079] Second fan speed: can be set to low speed. When the indoor coil temperature rises to a certain level, increase the fan speed to speed up the heating process.

[0080] The third fan speed setting can be set to medium for rapid heating, ensuring a quick increase in indoor temperature to meet users' heating needs.

[0081] Preset temperature threshold: Set to -30℃ to -10℃, for example, -15℃. When the outdoor ambient temperature is lower than or equal to the preset temperature threshold, the system considers the air conditioner 10 to be in a low-temperature heating environment. In this environment, the heating efficiency of the air conditioner 10 may decrease, and the risk of direct cold air blowing may also increase.

[0082] Preset current threshold: A current limit value based on the safe withstand capability of the circuit and system modules of the outdoor unit 120 of the air conditioner 10. This can be determined according to the specific model and specifications of the air conditioner 10. To ensure safety, the preset current threshold is calculated by multiplying the maximum current value that the outdoor unit 120 can withstand by a safety factor less than 1 (e.g., 90%). For example, if the maximum current value that the circuit and system modules of the outdoor unit 120 can safely withstand is 20A, the preset current threshold is: 20A * 90% = 18A.

[0083] Preset speed: Set to 1 rpm to 30 rpm. For example, 10 rpm (revolutions per second). Specifically, the preset speed can be set in combination with the characteristics of the compressor. Its main purpose is to ensure that the internal fan can smoothly reduce the airflow speed, thereby effectively avoiding unnecessary load shock to the compressor caused by sudden shutdown.

[0084] like Figure 2 As shown, the indoor coil temperature is represented by Tp, the first critical temperature by c, the second critical temperature by e, the third critical temperature by g, and the fourth critical temperature by i.

[0085] The first stage is the heat storage stage. The compressor starts working, but the indoor fan remains off. This stage is mainly to allow the indoor coils to accumulate heat in preparation for the subsequent heating process. As the compressor runs, the temperature of the indoor coils gradually rises.

[0086] The second stage is the initial heating stage. When the indoor coil temperature reaches the second critical temperature, the indoor fan starts and operates at the first fan speed (low setting). This stage is mainly to avoid excessively low indoor temperatures caused by prolonged periods without heating. The weak airflow at the first fan speed helps to gradually transfer heat from the indoor coil to the indoor air, providing slow heating.

[0087] The third stage is the accelerated heating stage. When the indoor coil temperature reaches the third critical temperature, the indoor fan switches to the second fan speed (low setting). This stage is to accelerate the heating speed, allowing the indoor ambient temperature to approach the user's set temperature more quickly. As the fan speed increases, airflow accelerates, and heat from the indoor coil is transferred to the indoor air more rapidly.

[0088] The fourth stage is the high-efficiency heating stage. When the indoor coil temperature reaches the fourth critical temperature, the indoor fan switches to the third fan speed (medium setting). This stage is to ensure that the indoor ambient temperature quickly reaches the user's set temperature. The third fan speed has a faster airflow speed, which can raise the indoor ambient temperature more quickly.

[0089] The fifth stage is the adjustment of heating speed. When the indoor coil temperature drops from the fourth critical temperature to the third critical temperature, the indoor fan switches back to the second fan speed. This stage aims to reduce energy consumption while maintaining a stable indoor temperature.

[0090] The sixth stage is the reduction of heating speed. When the indoor coil temperature drops from the third critical temperature to the second critical temperature, the indoor fan returns to the first fan speed. This stage is to further reduce energy consumption and noise while still maintaining a stable indoor temperature.

[0091] The seventh stage is the speed reduction operation stage. When the indoor coil temperature drops back to the first critical temperature, the fan gradually reduces its speed according to the preset rate. This stage is to slowly reduce the indoor fan speed to avoid excessive system pressure caused by a sudden stop of the indoor fan, which could trigger the compressor shutdown protection.

[0092] The cold air prevention control method in this embodiment achieves high efficiency, energy saving, stability, and safety during the heating process by accurately monitoring the indoor coil temperature, rationally controlling the indoor fan speed, and preventing the compressor from triggering the shutdown protection mechanism. This not only improves the user experience but also provides a strong guarantee for the long-term stable operation of the air conditioner 10.

[0093] Furthermore, in the sixth stage of this embodiment, the indoor fan is adjusted to operate at a first fan speed, which is set to a very low level, meaning the fan speed is relatively low. Based on this adjustment, in the subsequent seventh stage, the indoor fan can continue to operate at the lowest speed allowed by the system (e.g., 300 rpm, where rpm is the unit of engine speed), instead of gradually decelerating until it stops. This approach can, to some extent, mitigate the risk of compressor shutdown for protection, thereby ensuring the continuous and stable operation of the air conditioner 10.

[0094] Figure 3 This is a schematic structural diagram of an air conditioner 10 according to an embodiment of the present invention, as shown below. Figure 3 As shown, this embodiment of the invention also provides an air conditioner 10. The air conditioner 10 includes at least an indoor unit 110, an outdoor unit 120, and a controller 130.

[0095] The indoor unit 110 is equipped with an indoor coil temperature sensor 111. The outdoor unit 120 is communicatively connected to the indoor unit 110 and is equipped with an outdoor ambient temperature sensor 121 and an outdoor unit current detection circuit 122. The controller 130 includes a memory 131 and a processor 132. The memory 131 stores a machine-executable program 133. When the machine-executable program 133 is executed by the processor 132, it is used to implement the anti-cold air control method of any of the above embodiments.

[0096] Specifically, controller 130 may include processor 132 adapted to execute stored instructions and memory 131 providing temporary storage space for the operation of said instructions during operation. Processor 132 may be a single-core processor 132, a multi-core processor 132, a computing cluster, or any other configuration. Memory 131 may include random access memory 131 (RAM), read-only memory 131, flash memory, or any other suitable storage system.

[0097] The processor 132 can be connected via a system interconnect (e.g., PCI, PCI-Express, etc.) to an I / O interface (input / output interface) suitable for connecting the air conditioner 10 to one or more I / O devices (input / output devices). The I / O devices may include, for example, a keyboard and indicating devices, wherein the indicating devices may include a touchpad or a touch screen, etc.

[0098] The processor 132 can also be linked via a system interconnect to a display interface suitable for connecting the controller 130 to a display device. The display device may include a display screen that is a built-in component of the controller 130. The display device may also include a computer monitor, television, or projector externally connected to the air conditioner 10. Furthermore, the network interface controller (NIC) 130 may be adapted to connect the controller 130 to a network via a system interconnect. In some embodiments, the NIC may use any suitable interface or protocol (such as an Internet Minicomputer System Interface) to transmit data. The network may be a cellular network, a radio network, a wide area network (WAN), a local area network (LAN), or the Internet, etc. Remote devices can connect to the controller 130 via the network.

[0099] The flowchart provided in this embodiment is not intended to indicate that the operations of the method will be performed in any particular order, or that all operations of the control method are included in every case. The control method may include additional operations. Within the scope of the technical concept provided by the control method in this embodiment, additional variations can be made to the above control method.

[0100] Therefore, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. A method for controlling cold air in an air conditioner, comprising: Upon receiving a control command to operate in heating mode, it monitors the indoor coil temperature, outdoor ambient temperature, and instantaneous value of the outdoor unit current. During the operation of the indoor fan, when the indoor coil temperature is detected to be less than or equal to the first critical temperature, it is determined whether the outdoor ambient temperature is less than or equal to a preset temperature threshold and whether the instantaneous value of the outdoor unit current is greater than or equal to a preset current threshold. If the outdoor ambient temperature is less than or equal to a preset temperature threshold, and the instantaneous value of the outdoor unit current is greater than or equal to a preset current threshold, the indoor fan is controlled to run at a preset speed.

2. The method for controlling cold air according to claim 1, wherein, The steps of controlling the internal fan to operate at a preset speed include: During the deceleration process, if the indoor coil temperature is continuously lower than the first critical temperature, the indoor fan will be controlled to continue to decelerate until it stops.

3. The method for controlling cold air according to claim 1, wherein, The steps of controlling the internal fan to operate at a preset speed include: During the deceleration process, if the indoor coil temperature is detected to be greater than or equal to the second critical temperature, the indoor fan is controlled to run at a preset fan speed. The second critical temperature is greater than the first critical temperature.

4. The method for controlling cold air according to claim 1, wherein, After receiving the control command to operate in heating mode, the process also includes: The indoor fan is kept off to allow the indoor coil to store heat.

5. The method for controlling cold air according to claim 4, wherein, Following the step of maintaining the internal fan in a stopped state, the method further includes: If the indoor coil temperature is detected to be greater than or equal to the second critical temperature and less than the third critical temperature, the indoor fan is started and controlled to run at a preset first wind speed. The first critical temperature, the second critical temperature, and the third critical temperature increase sequentially.

6. The method for controlling cold air according to claim 5, wherein, After the step of controlling the internal fan to operate at a preset first wind speed, the method further includes: If the indoor coil temperature is detected to be greater than or equal to the third critical temperature and less than the fourth critical temperature, the indoor fan is controlled to run at the preset second wind speed. Wherein, the fourth critical temperature is greater than the third critical temperature, and the second wind speed is greater than the first wind speed.

7. The method for controlling cold air according to claim 6, wherein, After the step of controlling the internal fan to operate at a preset second wind speed, the method further includes: If the indoor coil temperature is detected to be greater than or equal to the fourth critical temperature, the indoor fan is controlled to run at the preset third wind speed. The third wind speed is greater than the second wind speed.

8. The method for controlling cold air according to claim 7, wherein, After the step of controlling the internal fan to operate at a preset third wind speed, the method further includes: If the indoor coil temperature is detected to be greater than the second critical temperature and less than or equal to the third critical temperature, the indoor fan is controlled to resume operation at the second fan speed.

9. The method for controlling cold air according to claim 8, wherein, After the step of controlling the internal fan to resume operation at the second wind speed, the method further includes: If the indoor coil temperature is detected to be greater than the first critical temperature and less than or equal to the second critical temperature, the indoor fan is controlled to resume operation at the first fan speed.

10. An air conditioner, comprising: The indoor unit is equipped with an indoor coil temperature sensor; The outdoor unit is communicatively connected to the indoor unit and is equipped with an outdoor ambient temperature sensor and an outdoor unit current detection circuit. as well as A controller includes a memory and a processor, the memory storing a machine-executable program, which, when executed by the processor, is used to implement the anti-cold air control method according to any one of claims 1-9.

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