A control method and device of a fresh air conditioner and the fresh air conditioner

Abstract

The application discloses a fresh air conditioner control method and device and a fresh air conditioner, and relates to the technical field of air conditioners. The fresh air conditioner control method comprises the following steps: when a fresh air mode is started, the indoor environment temperature and the outdoor environment temperature are monitored, and the temperature difference between the outdoor environment temperature and the indoor environment temperature is calculated; in a first control stage, the fresh air fan is controlled to rotate in a forward direction to deliver fresh air to the indoor environment based on the temperature difference, and it is detected whether the fresh air conditioner completes indoor air exchange; when the indoor air exchange is completed, the second control stage is entered; in the second control stage, the fresh air fan is controlled to rotate in a reverse direction to exhaust air to the outdoor environment based on the temperature difference, and the running time length of the second control stage is detected; when the running time length of the second control stage reaches a first preset time length, the first control stage is returned to be executed. The application can avoid the indoor environment temperature fluctuation caused by continuously delivering fresh air to the indoor environment, reduce the heat loss of cold and heat exchange, improve the comfort of users, and save the air conditioner energy consumption.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to a control method, device, and fresh air conditioner for a fresh air conditioner. Background Technology

[0002] As people's demands for indoor air quality increase, the use of fresh air conditioning systems is becoming more and more common. The fresh air system in a fresh air conditioning system enables air circulation between indoors and outdoors, and also purifies the air. However, when the outdoor temperature is too high or too low, the temperature difference between indoors and outdoors is large, and using the fresh air function can easily affect the indoor temperature. Existing fresh air control technology typically continuously supplies fresh air into the room after the fresh air mode is activated. While this method can continuously purify indoor air, it can easily lead to constant fluctuations in the indoor ambient temperature, reducing user comfort and also causing the air conditioner to consume more energy. Summary of the Invention

[0003] To address the aforementioned issues, this invention provides a control method, device, and fresh air conditioner for fresh air conditioning, which can prevent indoor temperature fluctuations caused by continuously supplying fresh air into the room, reduce heat loss from heat exchange, improve user comfort, and save air conditioning energy consumption.

[0004] According to an embodiment of the present invention, a control method for a fresh air conditioner is provided, comprising: when the fresh air mode is turned on, monitoring the indoor ambient temperature and the outdoor ambient temperature, and calculating the temperature difference between the outdoor ambient temperature and the indoor ambient temperature; in a first control stage, controlling the fresh air fan to rotate forward based on the temperature difference to deliver fresh air into the room, detecting whether the fresh air conditioner has completed indoor air exchange, and when indoor air exchange is completed, entering a second control stage; in the second control stage, controlling the fresh air fan to rotate in reverse based on the temperature difference to exhaust air to the outside, detecting the running time of the second control stage, and when the running time of the second control stage reaches a first preset time, returning to execute the first control stage.

[0005] By adopting the above technical solution, controlling the fresh air fan to rotate forward in the first control stage to deliver fresh air into the room can increase the indoor fresh air volume, thereby improving the comfort of the indoor environment. By controlling the fresh air fan to rotate in reverse in the second control stage to exhaust air to the outside, the indoor polluted air can be discharged. By repeating the first and second control stages, the indoor temperature fluctuation caused by the continuous delivery of fresh air into the room can be avoided, the heat loss from heat exchange can be reduced, the user's comfort can be improved, and the air conditioning energy consumption can be saved.

[0006] Preferably, the step of controlling the fresh air fan to rotate forward based on the temperature difference to deliver fresh air into the room includes: when the temperature difference is less than or equal to a first preset temperature, controlling the fresh air fan to rotate forward at a first preset speed and controlling the compressor to operate at a first preset frequency; when the temperature difference is greater than the first preset temperature, controlling the fresh air fan to rotate forward at its maximum speed, controlling the compressor to operate at a second preset frequency, and controlling the indoor fan to operate at its lowest fan speed; wherein, the first preset frequency is greater than the second preset frequency.

[0007] By adopting the above technical solution, when the temperature difference between indoor and outdoor ambient temperatures is small, the fresh air fan is controlled to rotate forward at the first preset speed to ensure that fresh air enters the room. The compressor frequency is controlled to increase so that the indoor ambient temperature can quickly approach the set temperature. This ensures that the indoor ambient temperature meets the user's requirements while improving indoor air quality. When the temperature difference between indoor and outdoor ambient temperatures is large, the fresh air fan is controlled to run at its maximum speed, the compressor frequency is controlled to decrease, and the indoor fan is controlled to run at a lower fan speed to ensure a continuous supply of fresh air into the room. This allows the fresh air to fully exchange heat in the evaporator while preventing the compressor from shutting down due to overload protection.

[0008] Preferably, the step of detecting whether the fresh air conditioner has completed indoor air exchange includes: determining whether the running time of the first control phase has reached a second preset time; if so, determining that indoor air exchange has been completed; wherein, the second preset time is positively correlated with the indoor area.

[0009] By adopting the above technical solution, the accuracy of indoor ventilation judgment can be improved by determining whether an indoor ventilation cycle has been completed based on the running time of the first control stage, ensuring that indoor ventilation can be completed in the first control stage and improving the comfort of the indoor environment.

[0010] Preferably, the step of controlling the fresh air fan to rotate in reverse to exhaust air to the outside based on the temperature difference includes: when the temperature difference is less than or equal to a second preset temperature, controlling the fresh air fan to rotate in reverse at a third preset speed, and controlling the compressor's frequency limiting frequency to a first frequency limiting frequency; wherein, the second preset temperature is greater than the first preset temperature; when the temperature difference is greater than the second preset temperature, controlling the fresh air fan to rotate in reverse at a fourth preset speed, and controlling the compressor's frequency limiting frequency to a second frequency limiting frequency; wherein, the third preset speed is less than or equal to the fourth preset speed, and the first frequency limiting frequency is greater than the second frequency limiting frequency.

[0011] By adopting the above technical solutions, when the temperature difference is small, the fresh air fan is controlled to rotate in the reverse direction at the third preset speed, which can exhaust the indoor polluted air. By controlling the compressor's frequency limit to a larger first frequency limit, the compressor can operate at a higher frequency, ensuring that the indoor ambient temperature can quickly meet the user's needs, avoiding sudden changes in indoor temperature, and improving indoor environmental comfort. When the temperature difference is large, the fresh air fan is controlled to operate at a larger fourth preset speed, which increases the amount of polluted air discharged when the indoor ambient temperature is more comfortable, thus improving indoor air quality. The compressor's frequency limit is controlled to a lower second frequency limit, ensuring the stable operation of the compressor.

[0012] Preferably, the step of determining the first frequency limiting frequency includes:

[0013] Obtain the current wind speed of the internal fan. When the current wind speed is high, the value range of the first frequency limiting frequency is 95% to 100% of the maximum frequency. When the current wind speed is medium, the value range of the first frequency limiting frequency is 90% to 95% of the maximum frequency. When the current wind speed is low or silent, the value range of the first frequency limiting frequency is 85% to 90% of the maximum frequency.

[0014] And / or,

[0015] The steps for determining the second frequency limiting frequency include:

[0016] Obtain the current wind speed of the internal fan. When the current wind speed is high, the value range of the second frequency limiting frequency is 90% to 95% of the maximum frequency; when the current wind speed is medium, the value range of the second frequency limiting frequency is 75% to 85% of the maximum frequency; when the current wind speed is low, the value range of the second frequency limiting frequency is 50% to 60% of the maximum frequency; when the current wind speed is silent, the value range of the second frequency limiting frequency is 30% to 40% of the maximum frequency.

[0017] By adopting the above technical solution, when the temperature difference between indoor and outdoor ambient temperatures is small, a frequency limit close to the maximum frequency is set for the compressor to avoid limiting the compressor frequency too much and affecting the adjustment speed of indoor ambient temperature, thus improving the temperature regulation effect of the fresh air conditioner; by setting a lower frequency limit when the temperature difference is large, the compressor operating frequency is prevented from being too high when approaching the temperature shutdown point, thus avoiding protection shutdown and improving the stability of the fresh air conditioner operation.

[0018] Preferably, the values ​​of the third preset speed and the fourth preset speed are in the range of 1.5 times the internal fan speed to 2.5 times the internal fan speed.

[0019] Preferably, the first preset frequency is the target frequency + x, and the second preset frequency is the target frequency - x;

[0020] The target frequency is the operating frequency corresponding to the current windshield of the internal fan, and the value of x ranges from 1Hz to 10Hz.

[0021] According to an embodiment of the present invention, another aspect provides a control device for a fresh air conditioning system, comprising:

[0022] The monitoring module is used to monitor the indoor and outdoor ambient temperatures when the fresh air mode is turned on, and to calculate the temperature difference between the outdoor and indoor ambient temperatures.

[0023] The first control module is used to control the fresh air fan to rotate in the forward direction based on the temperature difference to deliver fresh air into the room, detect whether the fresh air air conditioner has completed indoor air exchange, and execute the second control module when indoor air exchange is completed.

[0024] The second control module is used to control the fresh air fan to rotate in reverse to exhaust air to the outside based on the temperature difference, detect the running time of the second control phase, and when the running time of the second control phase reaches the first preset time, return to execute the first control module.

[0025] According to an embodiment of the present invention, another aspect provides a fresh air conditioner, including a computer-readable storage medium storing a computer program and a processor, wherein the computer program is read and executed by the processor to implement the method as described in any of the first aspects.

[0026] According to an embodiment of the present invention, another aspect provides a computer-readable storage medium storing a computer program that, when read and executed by a processor, implements the method as described in any of the first aspects.

[0027] The present invention has the following beneficial effects: by controlling the fresh air fan to rotate forward in the first control stage to deliver fresh air into the room, the indoor fresh air volume can be increased, thereby improving the comfort of the indoor environment. By controlling the fresh air fan to rotate in the second control stage to exhaust air to the outside, the indoor polluted air can be discharged. By repeatedly executing the first and second control stages, the indoor temperature fluctuation caused by continuously delivering fresh air into the room can be avoided, the heat loss from heat exchange can be reduced, the user's comfort can be improved, and the air conditioning energy consumption can be saved. Attached Figure Description

[0028] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0029] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0030] Figure 1 A flowchart of a fresh air conditioning control method provided by the present invention;

[0031] Figure 2 A control logic diagram for a fresh air conditioner provided by the present invention;

[0032] Figure 3 This is a schematic diagram of the control device structure for a fresh air conditioner provided by the present invention. Detailed Implementation

[0033] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0035] This embodiment provides a control method for a fresh air conditioning unit. This method can be applied to fresh air conditioning units, see below. Figure 1 The flowchart of the fresh air conditioning control method shown here mainly includes the following steps S102 to S106:

[0036] Step S102: When the fresh air mode is turned on, monitor the indoor ambient temperature and the outdoor ambient temperature, and calculate the temperature difference between the outdoor ambient temperature and the indoor ambient temperature.

[0037] When the fresh air conditioner starts running in fresh air mode, it uses the temperature sensor at the air inlet of the indoor unit to detect the indoor ambient temperature in real time, and the temperature sensor at the air inlet of the outdoor unit to detect the outdoor ambient temperature in real time. It then calculates the temperature difference between the outdoor ambient temperature and the indoor ambient temperature in real time or periodically. This temperature difference can be |outdoor ambient temperature - indoor ambient temperature|.

[0038] Step S104: First control stage, based on the temperature difference, control the fresh air fan to rotate in the forward direction to deliver fresh air to the room, detect whether the fresh air air conditioner has completed indoor air exchange, and when indoor air exchange is completed, enter the second control stage;

[0039] The control of the fresh air mode is divided into two control stages. In the first control stage, the fresh air fan is controlled to rotate in the forward direction based on the temperature difference between the outdoor and indoor ambient temperatures, so that the fresh air system delivers fresh air into the room. When the temperature difference is greater, it indicates that the indoor ambient temperature changes more and the indoor ambient temperature is closer to the set temperature. The fresh air fan speed is controlled to be higher and the compressor frequency is lower, so as to ensure that the indoor ambient temperature can meet the user's needs.

[0040] Based on the air conditioner's capacity and fresh air volume, it is periodically determined whether the fresh air conditioner has completed indoor air exchange. In one implementation, it can be determined whether the running time of the first control stage has reached a second preset time. If so, it is determined that indoor air exchange has been completed. The second preset time is positively correlated with the indoor area.

[0041] Typically, a fresh air conditioner needs to exchange indoor air 0.5-1 times per hour. For example, a 1.5P air conditioner is recommended for a room of 20 square meters with a building height of 2.8 meters and a fresh air volume of 60m³ / h. 3 A fresh air conditioner with a capacity of / h can ventilate the entire room once in 1 hour. The second preset duration can range from 1 to 2 hours, with 1 hour being the preferred value. By determining whether an indoor air exchange has been completed based on the duration of the first control phase, the accuracy of indoor air exchange determination can be improved, ensuring that indoor air exchange can be completed in the first control phase, thereby enhancing the comfort of the indoor environment.

[0042] Step S106: Second control phase, based on the temperature difference, control the fresh air fan to rotate in reverse to exhaust air to the outside, detect the running time of the second control phase, and when the running time of the second control phase reaches the first preset time, return to execute step S104.

[0043] After the first control phase completes one air exchange, the second control phase begins. In the second control phase, as the indoor temperature stabilizes, the fresh air fan switches from forward air supply mode to reverse exhaust mode. This removes stale indoor air, creating a slightly negative pressure environment. Outdoor air can then be introduced into the room through gaps in doors and windows, ensuring fresh air intake while preventing large fluctuations in indoor temperature caused by continuous fresh air supply.

[0044] The first preset duration can be between 20 and 40 minutes, with 30 minutes being the preferred value. When the duration of the second control phase reaches the first preset duration, the process returns to step S104 to supply fresh air into the room again. This allows for the repeated execution of the first and second control phases, enabling the periodic supply of fresh air into the room and the removal of stale air, thus improving the comfort of the indoor environment.

[0045] The fresh air conditioning control method provided in this embodiment can increase the indoor fresh air volume and thus improve the indoor environmental comfort by controlling the fresh air fan to rotate forward in the first control stage to deliver fresh air into the room. By controlling the fresh air fan to rotate in the second control stage to exhaust air to the outside, the indoor polluted air can be discharged. By repeatedly executing the first and second control stages, the indoor environmental temperature fluctuation caused by the continuous delivery of fresh air into the room can be avoided, the heat loss from heat exchange can be reduced, the user's comfort can be improved, and the air conditioning energy consumption can be saved.

[0046] In one embodiment, this embodiment provides an implementation method for controlling the forward rotation of the fresh air fan based on temperature difference to deliver fresh air into the room, which can be performed according to the following steps:

[0047] Step (1): When the temperature difference is less than or equal to the first preset temperature, control the fresh air fan to rotate in the positive direction at the first preset speed, and control the compressor to run at the first preset frequency;

[0048] The value of the first preset temperature can be in the range of 3 to 7°C, with 5°C being the preferred value.

[0049] When the temperature difference between the indoor and outdoor environments is less than or equal to the first preset temperature, it indicates that the indoor and outdoor temperatures are close. The fresh air conditioning system operates for a shorter period, controlling the indoor fan to run at the set fan speed and the fresh air fan to rotate at the first preset speed (which can be less than or equal to the maximum speed) to ensure sufficient fresh air intake. The compressor frequency is increased to quickly bring the indoor temperature close to the set temperature, thus improving indoor air quality while meeting user requirements. Typically, the compressor's operating frequency is determined by the indoor fan's fan speed setting, and the aforementioned first preset frequency can be higher than the operating frequency corresponding to the current set fan speed setting.

[0050] Step (2): When the temperature difference is greater than the first preset temperature, control the fresh air fan to rotate in the forward direction at the maximum speed, and control the compressor to run at the second preset frequency; wherein, the first preset frequency is greater than the second preset frequency.

[0051] When the temperature difference between the indoor and outdoor environments exceeds the first preset temperature, the indoor temperature changes significantly, and the indoor unit may be about to reach the set temperature and shut down. The fresh air fan is controlled to rotate forward at its maximum speed to maximize environmental comfort while ensuring that the indoor temperature meets the set temperature. The compressor frequency is reduced to allow the incoming fresh air to fully exchange heat in the evaporator. The indoor fan is controlled to operate at a lower fan speed to ensure a continuous supply of fresh air into the room, while also preventing the compressor from shutting down due to overload protection.

[0052] In one embodiment, the first preset frequency provided in this embodiment is the target frequency + x, and the second preset frequency is the target frequency - x; the target frequency is the operating frequency corresponding to the current windshield of the internal fan, and the value of x is in the range of 1HZ to 10HZ, preferably 3HZ or 5HZ.

[0053] In one embodiment, this embodiment provides an implementation method that controls the fresh air fan to rotate in reverse based on the temperature difference to exhaust air to the outside. The specific steps are as follows:

[0054] Step 1): When the temperature difference is less than or equal to the second preset temperature, control the fresh air fan to rotate in the opposite direction at the third preset speed, and control the compressor's frequency limit to the first frequency limit; wherein, the second preset temperature is greater than the first preset temperature;

[0055] The second preset temperature is higher than the first preset temperature, and the value of the second preset temperature can be between 7 and 12°C, with a preferred value of 10°C. By setting a larger second preset temperature in the second control stage, the temperature threshold is relaxed during stable operation of the air conditioner, so as to facilitate the rapid removal of polluted indoor air.

[0056] The range of the third preset speed is from 1.5 to 2.5 times the speed of the internal fan, with the preferred value being 1.9 times the speed of the internal fan. For example, when the speed of the internal fan is 1050 r / min, the speed of the fresh air fan is controlled to be 1050 * 1.9 = 2000 r / min.

[0057] When the temperature difference between the indoor and outdoor environments is less than or equal to the second preset temperature, the fresh air fan is controlled to rotate in the opposite direction at the third preset speed to exhaust the polluted indoor air. By controlling the compressor's frequency limit to the larger first frequency limit, the compressor can operate at a higher frequency, ensuring that the indoor environment temperature can quickly meet the user's needs, avoiding sudden changes in indoor temperature, and improving the comfort of the indoor environment.

[0058] In one embodiment, the step of determining the first frequency limiting frequency includes: obtaining the current windshield of the internal fan; when the current windshield is a high windshield, the value range of the first frequency limiting frequency is from the maximum frequency * 95% to the maximum frequency * 100%, with the preferred value being the maximum frequency * 100%.

[0059] When the current windshield is a medium windshield, the value range of the first frequency limiting frequency is 90% to 95% of the maximum frequency, with the preferred value being 95% of the maximum frequency.

[0060] When the current windshield is a low windshield or a silent windshield, the value range of the first frequency limiting frequency is 85% to 90% of the maximum frequency, with the preferred value being 90% of the maximum frequency.

[0061] By setting a frequency limit close to the maximum frequency for the compressor when the temperature difference between the indoor and outdoor environments is less than or equal to the second preset temperature, the system avoids limiting the compressor frequency too much and affecting the speed of adjusting the indoor environment temperature, thus improving the temperature regulation effect of the fresh air conditioner.

[0062] Step 2): When the temperature difference is greater than the second preset temperature, control the fresh air fan to rotate in the opposite direction at the fourth preset speed, and control the compressor's frequency limit to the second frequency limit; wherein, the third preset speed is less than or equal to the fourth preset speed, and the first frequency limit is greater than the second frequency limit.

[0063] The range of the fourth preset speed is from 1.5 times the internal fan speed to 2.5 times the internal fan speed, with the preferred value being 2 times the internal fan speed.

[0064] When the temperature difference between the indoor and outdoor environments is greater than the second preset temperature, it indicates that the current indoor and outdoor environments are significantly different and the indoor environment temperature is close to the set temperature. The fresh air fan is then controlled to run at a higher fourth preset speed to increase the amount of polluted air discharged and improve indoor air quality when the indoor environment temperature is more comfortable. The compressor's frequency limit is controlled to a lower second frequency limit to ensure stable operation of the compressor.

[0065] In one embodiment, the step of determining the second frequency limiting frequency includes: obtaining the current windshield of the internal fan; when the current windshield is a high windshield, the value range of the second frequency limiting frequency is from 90% to 95% of the maximum frequency, with the preferred value being 95% of the maximum frequency.

[0066] When the current windshield is a medium windshield, the value range of the second frequency limiting frequency is 75% to 85% of the maximum frequency, with the preferred value being 80% of the maximum frequency.

[0067] When the current windshield is at a low windshield setting, the range of the second frequency limiting frequency is from 50% to 60% of the maximum frequency, with the preferred value being 50% of the maximum frequency.

[0068] When the current windshield is a silent windshield, the value range of the second frequency limiting frequency is 30% to 40% of the maximum frequency, with the preferred value being 35% of the maximum frequency.

[0069] By setting a lower frequency limit when the temperature difference is large, the compressor's operating frequency is prevented from running too frequently when the temperature is close to the shutdown point, thus avoiding protection shutdown and improving the stability of the fresh air conditioning operation.

[0070] The fresh air conditioning control method provided in this embodiment can reduce the heat loss of fresh air heat exchange by adjusting the fresh air input and compressor frequency according to the difference between the outdoor ambient temperature and the indoor temperature at different control stages, avoid sudden changes in indoor temperature, improve environmental comfort and user satisfaction, improve the heat exchange efficiency of the evaporator, and improve the heating or cooling effect of the air conditioner during operation.

[0071] Corresponding to the control method for the fresh air conditioner provided in the above embodiments, this invention provides an example of applying the above control method for the fresh air conditioner, which can be specifically performed according to the following steps:

[0072] Step 1, First Control Phase

[0073] See also Figure 2 The control logic diagram of the fresh air conditioner shown shows that when the fresh air mode is turned on, the indoor and outdoor air inlet temperatures are detected in real time, and the absolute value T1 of the difference between the indoor and outdoor air inlet temperatures is calculated.

[0074] When the temperature difference between indoors and outdoors T1 is less than or equal to 5°C, the indoor fan is controlled to operate at the set wind speed, the fresh air fan is controlled to run at its maximum speed to deliver air into the room, and the compressor is controlled to operate at the frequency compensation of 3Hz corresponding to the set wind speed of the indoor fan, so that the indoor ambient temperature can reach the set temperature as soon as possible.

[0075] For example, if the outdoor ambient temperature is 35℃, the frequency corresponding to the set fan speed of the indoor fan is 84HZ, and the compensation of 3HZ controls the compressor frequency to 87HZ.

[0076] When the temperature difference between indoors and outdoors, T1, is greater than 5°C, the indoor unit of the air conditioner may reach its maximum temperature and shut down. In this case, the air conditioner will operate in 100% fresh air mode, controlling the fresh air fan to rotate at its maximum speed (2000 r / min) in the forward direction, controlling the compressor to operate at a low frequency so that the incoming fresh air can fully exchange heat in the evaporator, and controlling the indoor fan to operate at the lowest fan speed (200 r / min) to introduce fresh air into the room. This can prevent the indoor unit from freezing and avoid compressor overload protection.

[0077] Determine if the runtime is greater than or equal to 1 hour. If so, execute the second control phase.

[0078] Step 2, Second Control Phase

[0079] Calculate the absolute value T1 of the difference between the indoor side air inlet temperature and the outdoor side air inlet temperature;

[0080] When the temperature difference between indoors and outdoors T1 is less than or equal to 10°C, the indoor fan is controlled to run at the set wind speed, the fresh air fan speed is controlled to be the indoor fan speed * 1.9 rounded up, the fresh air fan runs in reverse to exhaust air, and the compressor frequency limit is adjusted according to the current wind speed of the indoor fan.

[0081] For example, when the internal fan speed is 1050 r / min, the reverse speed of the fresh air fan is controlled to be 1050 * 1.9 = 2000 r / min.

[0082] When the current fan speed setting is high, the compressor frequency limit is 100% of the maximum frequency; when the current fan speed setting is medium, the compressor frequency limit is 95% of the maximum frequency; when the current fan speed setting is low or silent, the compressor frequency limit is 90% of the maximum frequency.

[0083] When the temperature difference between indoors and outdoors T1 is greater than 10°C, the indoor fan is controlled to run at the set speed, the fresh air fan speed is controlled to be twice the indoor fan speed, the fresh air fan runs in reverse to exhaust air, and the compressor frequency limit is adjusted according to the current wind speed of the indoor fan.

[0084] For example, when the outdoor ambient temperature is 35℃, and the current fan speed is set to high, the compressor frequency limit is 95% of the maximum frequency (if the maximum frequency is 84Hz, then the compressor frequency limit is set to 80Hz); when the current fan speed is set to medium, the compressor frequency limit is 80% of the maximum frequency; when the current fan speed is set to low, the compressor frequency limit is 50% of the maximum frequency; and when the current fan speed is set to silent, the compressor frequency limit is 35% of the maximum frequency.

[0085] Determine if the runtime of the second control phase is greater than or equal to 0.5 hours. If so, return to execute the first control phase to supply fresh oxygen to the room and complete one cycle. By repeatedly executing the first and second control phases, fresh air can be continuously supplied to the room, and the indoor temperature will not fluctuate too much, reducing energy waste and meeting the user's requirements for air conditioning comfort and energy saving.

[0086] Corresponding to the control method for a fresh air conditioner provided in the above embodiments, this invention provides a control device for a fresh air conditioner, which can be applied to a fresh air conditioner, see below. Figure 3 The diagram shows the structure of the control device for a fresh air conditioning system. This device includes the following modules:

[0087] The monitoring module 31 is used to monitor the indoor and outdoor ambient temperatures and calculate the temperature difference between the outdoor and indoor ambient temperatures when the fresh air mode is turned on.

[0088] The first control module 32 is used to control the fresh air fan to rotate in the forward direction based on the temperature difference to deliver fresh air to the room, detect whether the fresh air air conditioner has completed indoor air exchange, and execute the second control module when indoor air exchange is completed.

[0089] The second control module 33 is used to control the fresh air fan to rotate in reverse to exhaust air to the outside based on the temperature difference, detect the running time of the second control stage, and return to execute the first control module when the running time of the second control stage reaches the first preset time.

[0090] The control device for the fresh air conditioner provided in this embodiment can increase the indoor fresh air volume by controlling the fresh air fan to rotate forward in the first control stage to deliver fresh air into the room, thereby improving the comfort of the indoor environment. By controlling the fresh air fan to rotate in the second control stage to exhaust air to the outside, the stale air in the room can be discharged. By repeatedly executing the first and second control stages, the fluctuation of indoor ambient temperature caused by continuous delivery of fresh air into the room can be avoided, the heat loss of heat exchange can be reduced, the user's comfort can be improved, and the air conditioning energy consumption can be saved.

[0091] Corresponding to the control method of the fresh air conditioner provided in the above embodiments, this embodiment provides an air conditioner, which includes a computer-readable storage medium storing a computer program and a processor. The computer program is read and executed by the processor to implement the control method of the fresh air conditioner provided in the above embodiments.

[0092] This embodiment also provides a computer-readable storage medium storing a computer program. When executed by a processor, this computer program implements the various processes of the above-described control method embodiment for a fresh air conditioner and achieves the same technical effect. To avoid repetition, it will not be described again here. The computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, etc.

[0093] Of course, those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by computer-controlled devices. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the above method embodiments. The storage medium can be a memory, a disk, an optical disk, etc.

[0094] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

[0095] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0096] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Regarding the control device and fresh air conditioner for the fresh air conditioner disclosed in the embodiments, since they correspond to the control method for the fresh air conditioner disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0097] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0098] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A method for controlling a fresh air conditioning system, characterized in that, include: When the fresh air mode is turned on, the indoor and outdoor ambient temperatures are monitored, and the temperature difference between the outdoor and indoor ambient temperatures is calculated. In the first control stage, the fresh air fan is controlled to rotate in the forward direction based on the temperature difference to deliver fresh air into the room. The system detects whether the fresh air air conditioner has completed indoor air exchange. When indoor air exchange is completed, the system enters the second control stage. In the second control phase, the fresh air fan is controlled to rotate in reverse to exhaust air to the outside based on the temperature difference. The duration of the second control phase is detected. When the duration of the second control phase reaches a first preset duration, the execution of the first control phase is returned. The step of controlling the fresh air fan to rotate in the forward direction based on the temperature difference to deliver fresh air into the room includes: When the temperature difference is less than or equal to the first preset temperature, the fresh air fan is controlled to rotate in the forward direction at the first preset speed, and the compressor is controlled to operate at the first preset frequency. When the temperature difference is greater than the first preset temperature, the fresh air fan is controlled to rotate forward at its maximum speed, the compressor is controlled to operate at a second preset frequency, and the internal fan is controlled to operate at the lowest fan speed; wherein, the first preset frequency is greater than the second preset frequency.

2. The control method for a fresh air conditioning system as described in claim 1, characterized in that, The step of detecting whether the fresh air conditioner has completed indoor air exchange includes: Determine whether the runtime of the first control phase has reached the second preset duration. If so, determine that indoor ventilation has been completed. The second preset duration is positively correlated with the indoor area.

3. The control method for a fresh air conditioning system as described in claim 1, characterized in that, The step of controlling the fresh air fan to rotate in reverse to exhaust air to the outside based on the temperature difference includes: When the temperature difference is less than or equal to the second preset temperature, the fresh air fan is controlled to rotate in the opposite direction at the third preset speed, and the frequency limiting frequency of the compressor is controlled to be the first frequency limiting frequency; wherein, the second preset temperature is greater than the first preset temperature; When the temperature difference is greater than the second preset temperature, the fresh air fan is controlled to rotate in the opposite direction at the fourth preset speed, and the frequency limiting frequency of the compressor is controlled to be the second frequency limiting frequency; wherein, the third preset speed is less than or equal to the fourth preset speed, and the first frequency limiting frequency is greater than the second frequency limiting frequency.

4. The control method for a fresh air conditioning system as described in claim 3, characterized in that, The steps for determining the first frequency limiting frequency include: Obtain the current wind speed of the internal fan. When the current wind speed is high, the value range of the first frequency limiting frequency is 95% to 100% of the maximum frequency; when the current wind speed is medium, the value range of the first frequency limiting frequency is 90% to 95% of the maximum frequency; when the current wind speed is low or silent, the value range of the first frequency limiting frequency is 85% to 90% of the maximum frequency. And / or, The steps for determining the second frequency limiting frequency include: Obtain the current windshield of the internal fan. When the current windshield is high, the value range of the second frequency limiting frequency is 90% to 95% of the maximum frequency; when the current windshield is medium, the value range of the second frequency limiting frequency is 75% to 85% of the maximum frequency; when the current windshield is low, the value range of the second frequency limiting frequency is 50% to 60% of the maximum frequency; when the current windshield is silent, the value range of the second frequency limiting frequency is 30% to 40% of the maximum frequency.

5. The control method for a fresh air conditioning system as described in claim 3, characterized in that, The values ​​of the third preset speed and the fourth preset speed are in the range of 1.5 times the internal fan speed and 2.5 times the internal fan speed.

6. The control method for a fresh air conditioning system as described in claim 1, characterized in that, The first preset frequency is the target frequency + x, and the second preset frequency is the target frequency - x; The target frequency is the operating frequency corresponding to the current windshield of the internal fan, and the value of x ranges from 1Hz to 10Hz.

7. A control device for a fresh air conditioning system, characterized in that, The control device for implementing the control method according to any one of claims 1-6 comprises: The monitoring module is used to monitor the indoor and outdoor ambient temperatures when the fresh air mode is turned on, and to calculate the temperature difference between the outdoor and indoor ambient temperatures. The first control module is used to control the fresh air fan to rotate in the forward direction based on the temperature difference to deliver fresh air into the room, detect whether the fresh air air conditioner has completed indoor air exchange, and execute the second control module when indoor air exchange is completed. The second control module is used to control the fresh air fan to rotate in reverse to exhaust air to the outside based on the temperature difference, detect the running time of the second control stage, and when the running time of the second control stage reaches the first preset time, return to execute the first control module.

8. A fresh air conditioning system, characterized in that, The method includes a computer-readable storage medium storing a computer program, which is read and executed by the processor to implement the method as described in any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when read and executed by a processor, implements the method as described in any one of claims 1-6.

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