Control method and system of fresh air conditioner

Abstract

The invention relates to the technical field of fresh air conditioner control, in particular to a fresh air conditioner control method and system.The control method is applied to a fresh air conditioner and comprises the following steps that S1, indoor and outdoor temperature values and indoor air parameters are obtained; s2, the indoor air parameters are compared with all preset air parameter standards, if parameters higher than all the air parameter standards exist in the indoor air parameters, an air outlet valve and an air outlet fan of an air outlet pipeline are opened, and an air inlet valve and an air inlet fan of a first air inlet pipeline are opened; s3, after an air inlet valve and an air inlet fan of the first air inlet pipeline are opened, the outdoor temperature value is compared with a preset comfortable temperature interval, and whether an air inlet valve and an air inlet fan of a second air inlet pipeline are opened or not is judged according to a comparison result; and the opening degrees of all the air inlet valves and all the air outlet valves are adjusted so that the indoor temperature can be kept within the comfortable temperature interval.

Description

Technical Field

[0001] The present invention relates to the technical field of fresh air air conditioner control, and in particular to a control method and system for a fresh air air conditioner. Background Art

[0002] When traditional air conditioners are running, in order to ensure the cooling or heating effect, the environment is usually closed, which will lead to poor indoor air circulation and poor air quality. To solve this problem, most new air conditioners are equipped with fresh air systems. However, since the temperature difference between indoor and outdoor is large after the air conditioner is turned on, the fresh air directly supplied often has the problem of being too cold or too hot, affecting the user experience.

[0003] When the air conditioner is running, if fresh air is directly sent into the room, due to the temperature difference between indoor and outdoor, the fresh air may have a greater impact on the indoor temperature, causing large fluctuations in the indoor temperature, thus affecting the user's comfort. In addition, if the fresh air is not properly processed or conditioned, its temperature may not match the indoor environment, further affecting the comfort and air quality of the indoor environment.

[0004] Therefore, a method is needed to automatically adjust the fresh air supply amount and control the temperature. Summary of the invention

[0005] In view of the above-mentioned defects, the purpose of the present invention is to propose a control method and system for a fresh air air conditioner to ensure that when fresh air is introduced, it will not cause excessive impact on the indoor temperature, while improving the indoor air quality and enhancing the user experience.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A control method for a fresh air air conditioner, the control method being applied to the fresh air air conditioner, the fresh air air conditioner being configured with a first air inlet duct, a second air inlet duct and an air outlet duct, the first air inlet duct and the second air inlet duct being both provided with an air inlet valve and an air inlet fan for adjusting indoor air intake, the first air inlet duct being provided with an air filter, and the air outlet duct being provided with an air outlet valve and an air outlet fan for adjusting indoor exhaust air;

[0008] The control method comprises the following steps:

[0009] S1: Obtain indoor and outdoor temperature values ​​and indoor air parameters;

[0010] S2: comparing the indoor air parameters with the preset air parameter standards, if there are parameters in the indoor air parameters that are higher than the air parameter standards, opening the air outlet valve and the air outlet fan of the air outlet duct, and opening the air inlet valve and the air inlet fan of the first air inlet duct;

[0011] S3: After opening the air inlet valve and the air inlet fan of the first air inlet duct, compare the outdoor temperature value with the preset comfortable temperature range, and determine whether to open the air inlet valve and the air inlet fan of the second air inlet duct according to the comparison result, and adjust the opening of all the air inlet valves and air outlet valves to maintain the indoor temperature in the comfortable temperature range.

[0012] Preferably, the indoor air parameters include indoor CO2 concentration, PM2.5 concentration, formaldehyde concentration and CO concentration.

[0013] Furthermore, in step S2, it includes:

[0014] When at least one parameter of the indoor air parameters is higher than the air parameter standard, if the outdoor temperature value is within the comfortable temperature range, the third operation is performed. During the execution of the third operation, if the indoor temperature value falls out of the comfortable temperature range, the third operation is stopped and the cooling or heating function is switched until the indoor temperature value is within the comfortable temperature range, and the third operation is re-executed until the indoor air parameter concentrations all meet the air parameter standard;

[0015] The third operation includes adjusting the openings of the air inlet valves of the first air inlet duct and the second air inlet duct and the air outlet valve of the air outlet duct to a third proportional opening.

[0016] Furthermore, in step S3, it includes:

[0017] When at least one parameter of the indoor air parameters is higher than the air parameter standard, and the outdoor temperature value is outside the comfortable temperature range, obtaining the difference between the outdoor temperature value and the lowest temperature value or the highest temperature value of the comfortable temperature range, and performing a first operation when the difference exceeds a maximum preset threshold;

[0018] The first operation includes opening the air inlet fan of the first air inlet duct and the air outlet valve of the air outlet duct, adjusting the openings of the air inlet valve of the first air inlet duct and the air outlet valve of the air outlet duct to a first proportional opening, and closing the second air inlet duct;

[0019] When executing the first operation, determine in real time whether the indoor temperature is within the comfortable temperature range. If not, stop executing the first operation and switch to the cooling or heating function until the indoor temperature value is within the comfortable temperature range. Then re-execute the first operation until the indoor air parameter concentration meets the air parameter standard.

[0020] Furthermore, in the step S3, it includes:

[0021] When at least one parameter of the indoor air parameters is higher than the air parameter standard and the outdoor temperature value is outside the comfortable temperature range, obtaining the difference between the outdoor temperature value and the lowest temperature value or the highest temperature value of the comfortable temperature range, and when the difference exceeds a minimum preset threshold and is lower than a maximum preset threshold, performing a second operation;

[0022] The second operation includes adjusting the opening of the air inlet valve of the first air inlet duct and the air outlet valve of the air outlet duct to a second proportional opening, opening the air inlet valve of the second air inlet duct and adjusting the opening to the first proportional opening;

[0023] When executing the second operation, determine in real time whether the indoor temperature is within the comfortable temperature range. If not, stop executing the second operation and switch to the cooling or heating function until the indoor temperature value is within the comfortable temperature range. Then re-execute the second operation until the indoor air parameter concentration meets the air parameter standard.

[0024] Furthermore, in the step S3, it includes:

[0025] When at least one of the indoor air parameters is higher than the air parameter standard, and the outdoor temperature value is outside the comfortable temperature range, determining the difference between the outdoor temperature value and the lowest temperature value or the highest temperature value of the comfortable temperature range, and when the difference is lower than or equal to the minimum preset threshold, performing a fourth operation;

[0026] The fourth operation includes adjusting the openings of the air inlet valves of the first air inlet duct and the second air inlet duct and the air outlet valve of the air outlet duct to a fourth proportional opening;

[0027] When executing the fourth operation, determine in real time whether the indoor temperature is within the comfortable temperature range. If not, stop executing the fourth operation and switch to the cooling or heating function until the indoor temperature value is within the comfortable temperature range. Then re-execute the fourth operation until the indoor air parameter concentration meets the air parameter standard.

[0028] Furthermore, the proportional opening satisfies the relationship:

[0029]

[0030] Among them, K represents the proportional opening, ω represents the temperature difference influence coefficient, α represents the concentration influence coefficient, θ represents the indoor air capacity adjustment coefficient, T 差 It indicates the difference between the outdoor temperature and the lowest or highest temperature in the comfortable temperature range. C indicates the maximum concentration exceeding the air parameter standard. V 室内 Indicates the air volume in the room.

[0031] A control system for a fresh air air conditioner, the control system is applied to the fresh air air conditioner, the control system is applied with the control method of the fresh air air conditioner as described above, the fresh air air conditioner is configured with a first air inlet duct, a second air inlet duct and an air outlet duct, the first air inlet duct and the second air inlet duct are both provided with an air inlet valve and an air inlet fan for adjusting indoor air intake, the first air inlet duct is provided with an air filter, and the air outlet duct is provided with an air outlet valve and an air outlet fan for adjusting indoor exhaust air;

[0032] A data acquisition module is used to obtain indoor and outdoor temperature values ​​and indoor air parameters;

[0033] The first control module is used to compare the indoor air parameters with the preset air parameter standards, and if there are parameters in the indoor air parameters that are higher than the air parameter standards, the air outlet valve and the air outlet fan of the air outlet duct are opened, and the air inlet valve and the air inlet fan of the first air inlet duct are opened;

[0034] The second control module is used to compare the outdoor temperature value with the preset comfortable temperature range after opening the air inlet valve and the air inlet fan of the first air inlet duct, determine whether to open the air inlet valve and the air inlet fan of the second air inlet duct according to the comparison result, and adjust the opening of all the air inlet valves and the air outlet valves to maintain the indoor temperature in the comfortable temperature range.

[0035] One of the above technical solutions has the following advantages or beneficial effects:

[0036] By obtaining indoor and outdoor temperature values ​​and air parameters and comparing them with preset standards, it can intelligently determine when fresh air needs to be introduced and when turbid air needs to be discharged, which helps to maintain indoor air quality and reduce the accumulation of harmful substances; according to the difference in indoor and outdoor temperatures, it can flexibly adjust the opening degree of the air inlet valve and fan to avoid drastic changes in indoor temperature due to too fast air change, which can maintain the comfort of the indoor environment, reduce energy waste, and improve the overall energy efficiency of fresh air air conditioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0038] Figure 1 is a flow chart of a control method for a fresh air air conditioner provided by an embodiment of the present invention;

[0039] Figure 2It is a structural schematic diagram of a control system of a fresh air air conditioner provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0041] In the present invention, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0042] When traditional air conditioners are running, in order to ensure the cooling or heating effect, the environment is usually closed, which will lead to poor indoor air circulation and poor air quality. To solve this problem, most new air conditioners are equipped with fresh air systems. However, since the temperature difference between indoor and outdoor is large after the air conditioner is turned on, the fresh air directly supplied often has the problem of being too cold or too hot, affecting the user experience.

[0043] When the air conditioner is running, if fresh air is directly sent into the room, due to the temperature difference between indoor and outdoor, the fresh air may have a greater impact on the indoor temperature, causing large fluctuations in the indoor temperature, thus affecting the user's comfort. In addition, if the fresh air is not properly processed or conditioned, its temperature may not match the indoor environment, further affecting the comfort and air quality of the indoor environment.

[0044] Therefore, a method is needed to automatically adjust the amount and temperature of fresh air supplied.

[0045] like Figure 1 As shown, a preferred embodiment of the present invention is a control method for a fresh air air conditioner, the control method is applied to the fresh air air conditioner, the fresh air air conditioner is configured with a first air inlet duct, a second air inlet duct and an air outlet duct, the first air inlet duct and the second air inlet duct are both provided with an air inlet valve and an air inlet fan for adjusting indoor air intake, the first air inlet duct is provided with an air filter, and the air outlet duct is provided with an air outlet valve and an air outlet fan for adjusting indoor exhaust air;

[0046] The control method comprises the following steps:

[0047] S1: Obtain indoor and outdoor temperature values ​​and indoor air parameters;

[0048] S2: comparing the indoor air parameters with the preset air parameter standards, if there are parameters in the indoor air parameters that are higher than the air parameter standards, opening the air outlet valve and the air outlet fan of the air outlet duct, and opening the air inlet valve and the air inlet fan of the first air inlet duct;

[0049] S3: After opening the air inlet valve and the air inlet fan of the first air inlet duct, compare the outdoor temperature value with the preset comfortable temperature range, and determine whether to open the air inlet valve and the air inlet fan of the second air inlet duct according to the comparison result, and adjust the opening of all the air inlet valves and air outlet valves to maintain the indoor temperature in the comfortable temperature range.

[0050] Specifically, the first air inlet duct is responsible for introducing fresh air from outside into the room, while the air inlet fan ensures the renewal of indoor air by pushing external air into the room. The opening of the air inlet valve can be adjusted to indirectly adjust the ventilation speed. The second air inlet duct has the same function and usage principle as the first air inlet duct. The first air inlet duct is equipped with an air filter, whose function is to filter out impurities in the air, such as reducing the concentration of PM2.5 in the air to purify the air; the air outlet duct discharges the processed indoor air to the outside, and the opening of the air outlet valve and the speed gear of the air outlet fan can be adjusted to increase or decrease the exhaust speed.

[0051] A temperature sensor and an air quality parameter detector can be installed at the air inlet of the first air inlet duct, the second air inlet duct, or the air outlet of the air outlet duct to obtain outdoor temperature values ​​and air parameters respectively. The fresh air air conditioner is also provided with a temperature sensor and an air quality parameter detector indoors to obtain indoor temperature values ​​and air parameters respectively. The air parameters include common ones such as carbon dioxide (CO2) concentration, PM2.5 concentration, volatile organic compounds (VOC), etc. The CO2 concentration and PM2.5 concentration are detected by infrared sensors or light scattering principles, and can reflect the freshness of the air.

[0052] The preset comfort temperature range is pre-set according to the user's geographical location and the current season. For example, in the southern region, the comfort temperature range is 20-24℃. The air quality standard is a comparison parameter used to measure whether the indoor and outdoor air meet the standards. For example, when the indoor C02 concentration exceeds 1000ppm, it means that the indoor air quality is poor and ventilation is needed. After comparing the indoor and outdoor temperature values ​​with the preset comfort temperature range, if the concentration of a certain harmful gas (such as formaldehyde) in the room is too high, fresh air from outside needs to be introduced into the room. The air inlet valve of the first air inlet duct will be opened to ensure that the outside air enters the indoor environment smoothly, and the air inlet fan is started to push the outside fresh air into the room. The opening of the outlet valve and the outlet fan of the outlet duct ensures that the turbid air in the room can be discharged to the outside.

[0053] Since there is a temperature difference between indoor and outdoor, changing the air too quickly will cause the indoor temperature to change too much. Therefore, it is necessary to adjust the air change speed in combination with the indoor and outdoor temperatures. In this embodiment, since the fresh air air conditioner will adjust the indoor temperature, the indoor temperature is within the comfortable temperature range. If the difference between the outdoor temperature and the indoor temperature is too large (for example, more than 5°C), and it is not within the comfortable temperature range, directly opening the air inlet valve and the fan may cause the indoor temperature to change sharply. At this time, the opening degree of the air inlet valve should be slowly adjusted to avoid the external temperature difference directly affecting the indoor temperature. If the outdoor temperature is within the comfortable temperature range, the air inlet valve of the second air inlet duct can be properly opened, and the air inlet fan can be adjusted to introduce external air. The air change speed can be accelerated to solve the problem of poor indoor air quality. Otherwise, the opening degree of the second air inlet channel is controlled to prevent excessive indoor temperature changes.

[0054] By obtaining indoor and outdoor temperature values ​​and air parameters and comparing them with preset standards, it can intelligently determine when fresh air needs to be introduced and when turbid air needs to be discharged, which helps to maintain indoor air quality and reduce the accumulation of harmful substances; according to the temperature difference between indoor and outdoor, it can flexibly adjust the opening degree of the air inlet valve and fan to avoid drastic changes in indoor temperature due to too fast air change, which can maintain the comfort of the indoor environment, reduce energy waste, and improve the overall energy efficiency of fresh air air conditioning.

[0055] Preferably, the indoor air parameters include one or more of indoor CO2 concentration, PM2.5 concentration, formaldehyde concentration and CO concentration.

[0056] Carbon dioxide is a gas naturally released during the breathing process, but in a closed or poorly ventilated environment, excessively high CO2 concentrations can cause the air to become stale, causing mild discomfort to users, and in severe cases, causing dizziness, drowsiness, inattention and other discomfort symptoms. Long-term exposure to a high CO2 concentration environment may lead to increased pressure in the respiratory system and affect brain function. Therefore, it is necessary to pay attention to changes in CO2 concentrations at all times, which is crucial to maintaining work efficiency and comfort.

[0057] PM2.5 refers to particles with a diameter of less than or equal to 2.5 microns. These particles can penetrate deep into the respiratory tract and even enter the blood circulation, causing damage to the lungs and cardiovascular system. The sources of PM2.5 include traffic emissions, industrial waste gas, construction sites, etc. High concentrations of PM2.5 are related to a variety of health problems, such as respiratory diseases, heart disease, lung cancer, etc. Long-term exposure to a PM2.5 polluted environment may also cause chronic diseases and increase the risk of disease, so it is necessary to pay attention to the concentration of PM2.5.

[0058] Formaldehyde is a common toxic volatile organic compound that is widely found in building materials, furniture, paints and home improvement materials. The release of formaldehyde is usually more serious in the initial stage after decoration, but it is highly volatile and can exist in indoor air for a long time. Formaldehyde is highly toxic to human health. Long-term exposure to an environment with excessively high formaldehyde concentration may cause respiratory irritation, allergic reactions, headaches, nausea and other symptoms, and in severe cases may even cause cancer (such as nasopharyngeal cancer). A common scenario is that newly purchased furniture by users will cause the indoor formaldehyde content to rise where the fresh air air conditioner is located, so it is necessary to detect and pay attention to the formaldehyde concentration.

[0059] In the cold winter, some users will smoke indoors, which will release carbon monoxide. When a cigarette burns, it will release about 1 to 2 mg of carbon monoxide. Although this amount seems small, considering the smoking frequency of smokers, especially long-term smoking, the cumulative effect may have serious impacts on health. Carbon monoxide combines with oxygen in the blood, reducing the blood's oxygen delivery capacity, which may cause headaches, fatigue or nausea. Long-term exposure to low concentrations of CO may also cause cardiovascular and nervous system diseases. Users can open windows for ventilation, but opening windows in cold winter will disrupt the temperature balance in the room. Therefore, it is necessary to pay attention to the concentration of carbon monoxide and ventilate when the concentration is too high.

[0060] Further, when at least one parameter of the indoor air parameters is higher than the air parameter standard, if the outdoor temperature value is within the comfortable temperature range, the third operation is performed, and during the execution of the third operation, if the indoor temperature value falls out of the comfortable temperature range, the third operation is stopped and switched to the cooling or heating function until the indoor temperature value is within the comfortable temperature range, and the third operation is re-executed until the indoor air parameter concentrations all meet the air parameter standard;

[0061] The third operation includes adjusting the openings of the air inlet valves of the first air inlet duct and the second air inlet duct and the air outlet valve of the air outlet duct to a third proportional opening.

[0062] Among indoor air parameters, formaldehyde and CO are used as examples for illustration. Formaldehyde and CO are common indoor pollutants. Formaldehyde mainly comes from volatile organic compounds such as furniture and decoration materials, while CO mostly comes from combustion processes, such as smoking. Excessive formaldehyde and CO concentrations are extremely harmful to human health and may cause symptoms such as difficulty breathing and dizziness. Long-term exposure may cause serious health problems. The formaldehyde and CO concentrations are monitored in real time. When they exceed the preset standard, the ventilation operation will be started. By adjusting the opening of the air inlet and outlet ducts, fresh air is introduced and polluted air is discharged, thereby improving indoor air quality.

[0063] Since formaldehyde and CO are extremely harmful to human health, and the indoor and outdoor temperatures are both in a comfortable temperature range, the openings of the air inlet valves of the first air inlet duct and the second air inlet duct and the air outlet valve of the air outlet duct are adjusted to a third proportional opening. In this embodiment, the third proportional opening is the maximum gear of the air outlet valve and the air inlet valve. When the maximum gear is opened for ventilation, a temperature feedback mechanism is also provided to ensure that the indoor temperature is always maintained in a comfortable range during the ventilation process. In this embodiment, because the indoor formaldehyde concentration exceeds the standard, it is more harmful to the human body. Therefore, it is necessary to open the valves of each air inlet duct and air outlet duct to the maximum through the fresh air exchange function, and at the same time Because the outdoor temperature is detected to be within the comfortable temperature range, when the outdoor air is exchanged to the indoor through the fresh air function, the fluctuation of the indoor temperature will be small, so the air inlet and outlet ducts can be opened to the maximum; but in the process of fresh air exchange, although the outdoor air temperature value is within the comfortable temperature range, the exchange of outdoor air with indoor air will inevitably cause the indoor temperature to rise or fall, which will bring a poor experience to users. Therefore, in the process of ventilation operation, when the indoor temperature falls out of the comfortable temperature range (for example, the indoor temperature is too high or too low), the current ventilation operation will be stopped immediately, and it will automatically switch to cooling or heating mode to adjust the indoor temperature to the comfortable range. Once the indoor temperature returns to the predetermined range, the ventilation operation will be re-enabled, which is conducive to ensuring that under different climatic conditions, the air quality can be effectively improved, and the comfortable temperature in the room can be maintained, avoiding the impact of drastic temperature fluctuations on comfort.

[0064] Further, when at least one parameter of the indoor air parameters is higher than the air parameter standard, and the outdoor temperature value is outside the comfortable temperature range, the difference between the outdoor temperature value and the lowest temperature value or the highest temperature value of the comfortable temperature range is determined, and when the difference exceeds a maximum preset threshold, a first operation is performed;

[0065] The first operation includes opening the air inlet fan of the first air inlet duct and the air outlet valve of the air outlet duct, adjusting the openings of the air inlet valve of the first air inlet duct and the air outlet valve of the air outlet duct to a first proportional opening, and closing the second air inlet duct;

[0066] When executing the first operation, determine in real time whether the indoor temperature is within the comfortable temperature range. If not, stop executing the first operation and switch to the cooling or heating function until the indoor temperature value is within the comfortable temperature range. Then re-execute the first operation until the indoor air parameter concentration meets the air parameter standard.

[0067] Too large a temperature difference may cause a sharp change in indoor temperature, thus affecting the comfort of the indoor environment. Specifically, by judging the difference between the outdoor temperature and the lowest or highest temperature value in the comfortable temperature range, if the difference exceeds a preset maximum threshold, it is considered that the temperature fluctuation of the current external environment may have a greater impact on the indoor comfort. Once the outdoor temperature difference exceeds the maximum threshold, the first operation is performed. The first operation includes turning on the air inlet fan of the first air inlet duct to increase the air circulation and improve the indoor air quality. In addition, the opening of the air inlet valve of the first air inlet duct and the air outlet valve of the air outlet duct are adjusted to the lowest gear (i.e., the first proportional opening). This can ensure air flow and maintain temperature stability without introducing too much external air that does not match the indoor temperature. In order to avoid the adverse effects of the rapid influx of external air, the second air inlet duct will be closed, which can effectively control the temperature and air circulation and reduce the impact of the temperature difference on the indoor environment.

[0068] During the execution of the first operation, the indoor temperature is monitored in real time. If it is found that the indoor temperature is not within the preset comfortable temperature range, the current operation will be stopped immediately and switched to cooling or heating mode to quickly adjust the indoor temperature back to the comfortable range. Only after the indoor temperature returns to the comfortable range will it be re-evaluated whether to continue the first operation. If the indoor temperature still deviates from the comfortable range, it will continue to be adjusted to a suitable temperature until the predetermined temperature requirement is met to avoid overcooling or overheating. For example, the indoor temperature is 24 degrees and the outdoor temperature is 29 degrees, the temperature difference is 5 degrees, and the maximum preset threshold is 4 degrees. At this time, the temperature difference is greater than the maximum preset threshold. At this time, the first operation is executed to open the first air inlet duct and the air outlet duct, but only to the minimum. The second air inlet duct is not opened. The reason for opening it to the minimum is to slowly replace the air and prevent too much outdoor hot air from entering the room at the same time. The second air inlet duct is to increase the air exchange speed and the air exchange volume in a short period of time, so it is not opened to prevent too much hot air from coming in.

[0069] It will also continuously monitor the formaldehyde concentration and CO concentration in the room to ensure that they always meet the set air quality standards. If the formaldehyde concentration or CO concentration exceeds the standard, it will maintain the current operation (i.e. continue to open the first air inlet duct and adjust the ventilation status) and will not switch to other modes until the air quality returns to normal levels. Air quality and temperature control are carried out simultaneously to ensure that both meet comfort and safety standards.

[0070] Further, when at least one parameter of the indoor air parameters is higher than the air parameter standard, and the outdoor temperature value is outside the comfortable temperature range, the difference between the outdoor temperature value and the lowest temperature value or the highest temperature value of the comfortable temperature range is determined, and when the difference exceeds a minimum preset threshold and is lower than a maximum preset threshold, a second operation is performed;

[0071] The second operation includes adjusting the opening of the air inlet valve of the first air inlet duct and the air outlet valve of the air outlet duct to a second proportional opening, opening the air inlet valve of the second air inlet duct and adjusting the opening to the first proportional opening;

[0072] When executing the second operation, determine in real time whether the indoor temperature is within the comfortable temperature range. If not, stop executing the second operation and switch to the cooling or heating function until the indoor temperature value is within the comfortable temperature range. Then re-execute the second operation until the indoor air parameter concentration meets the air parameter standard.

[0073] When the outdoor temperature exceeds the comfortable temperature range, the difference between the outdoor temperature and the lowest temperature value (if the outdoor temperature is low) or the highest temperature value (if the outdoor temperature is high) of the comfortable temperature range is calculated. This difference reflects the temperature difference between the outdoor temperature and the indoor comfortable temperature. This difference is compared with the set minimum and maximum thresholds. If the difference exceeds the minimum preset threshold and is less than the maximum preset threshold, it means that the fluctuation of the external temperature is sufficient to affect the indoor comfort, thereby triggering the second operation. The opening of the air inlet valve of the first air inlet duct and the air outlet valve of the air outlet duct will be adjusted to the second proportional opening. Even if the air intake and exhaust volumes increase, the air intake and exhaust volumes are still maintained. To maintain a certain control and avoid too much external air directly entering, the air inlet valve of the second air inlet duct will be opened and its opening will be adjusted to the first proportional opening, which will help balance the air flow and gradually adjust the indoor temperature and air quality. The second proportional opening is greater than the first proportional opening. The first proportional opening (low gear) is used for light air circulation while avoiding rapid fluctuations in indoor temperature. The second proportional opening (mid-range) is used when stronger air circulation is needed, especially when the external environment changes greatly or the indoor air quality is poor. This will help to quickly adjust the air circulation, thereby improving the air quality and restoring it to the preset comfort zone as soon as possible.

[0074] When the outdoor temperature exceeds the comfortable temperature range (such as 30℃ higher than 26℃), and the indoor formaldehyde concentration (0.1mg / m 3 ) exceeds the standard, the second operation will be triggered. First, the difference between the outdoor temperature and the comfortable temperature range is calculated (30℃-26℃=4℃). The difference is greater than the minimum threshold (2℃) and less than the maximum threshold (6℃). Therefore, it is considered that the external temperature change affects the indoor comfort, but the degree of impact is not as great as when the temperature difference exceeds the maximum preset threshold. Therefore, the air inlet valve of the first air inlet duct and the air outlet valve of the air outlet duct can be adjusted to the second proportional opening to increase air circulation. At the same time, the second air inlet duct is opened and its air inlet valve is adjusted to the first proportional opening, which helps to introduce more external air and improve the indoor air quality. In this process, the indoor temperature is monitored in real time, and the cooling function is automatically switched to when the indoor temperature exceeds the comfort range until the temperature drops to the comfort range (such as 25℃). When the indoor temperature returns to the comfortable range and the formaldehyde concentration drops to the standard value (0.08mg / m 3 ), stop the second operation.

[0075] Further, when at least one parameter of the indoor air parameters is higher than the air parameter standard, and the outdoor temperature value is outside the comfortable temperature range, the difference between the outdoor temperature value and the lowest temperature value or the highest temperature value of the comfortable temperature range is determined, and when the difference is lower than or equal to the minimum preset threshold, a fourth operation is performed;

[0076] The fourth operation includes adjusting the openings of the air inlet valves of the first air inlet duct and the second air inlet duct and the air outlet valve of the air outlet duct to a fourth proportional opening;

[0077] In some embodiments, the first proportional opening < the second proportional opening < the fourth proportional opening < the third proportional opening. When executing the fourth operation, it is determined in real time whether the indoor temperature is within the comfortable temperature range. If not, the fourth operation is stopped and the cooling or heating function is switched until the indoor temperature value is within the comfortable temperature range. The fourth operation is then executed again until the indoor air parameter concentrations meet the air parameter standards.

[0078] When the difference between the outdoor temperature and the comfort zone is lower than or equal to the minimum preset threshold, it is considered that the temperature change of the external environment is not enough to have a significant impact on the indoor temperature, but the air circulation needs to be increased to maintain indoor comfort. At this time, the third operation is performed to adjust the opening of the valve and the fan to increase air exchange. When it is judged that the difference is lower than the minimum preset threshold, the fourth operation is performed to adjust the air inlet valve of the first air inlet duct and the second air inlet duct and the air outlet valve of the air outlet duct to the fourth proportional opening to enhance air circulation. The size of the air valve opening determines the speed of air inflow and outflow. The fourth proportional opening is larger than the first and second proportional openings, which helps to accelerate air exchange, reduce the concentration of harmful substances in the room, and adjust the indoor environment.

[0079] After starting the air inlet valve and air inlet fan of the first air inlet duct, first compare the indoor and outdoor temperatures with the set comfortable temperature range (assuming it is 22°C to 26°C). If the indoor formaldehyde concentration or C0 concentration is higher than the standard value and the outdoor temperature exceeds the comfort range (for example, the outdoor temperature is 28°C, which is higher than the highest temperature of the comfort range of 26°C), judge the difference between the outdoor temperature and the comfort temperature range (such as the difference between 28°C and 26°C is 2°C). When the difference is lower than or equal to the preset minimum threshold (for example, 2°C), perform the fourth operation, adjust the opening of the air valve and the fan to increase air circulation, ensure the indoor temperature is stable, adjust the air inlet valves of the first and second air inlet ducts and the air outlet valve of the air outlet duct to the fourth proportional opening (for example, 60%), greatly enhance air circulation, and quickly reduce the concentration and temperature of harmful substances in the room. When the indoor temperature fails to return to the comfort zone, it will automatically switch to cooling or heating mode until the indoor temperature returns to between 22°C and 26°C, and then re-execute the fourth operation until the formaldehyde and CO concentrations meet the air quality standards.

[0080] Furthermore, the proportional opening satisfies the relationship:

[0081]

[0082] Among them, K represents the proportional opening, ω represents the temperature difference influence coefficient, α represents the concentration influence coefficient, θ represents the indoor air capacity adjustment coefficient, T 差 It indicates the difference between the outdoor temperature and the minimum or maximum temperature in the comfortable temperature range. C indicates the maximum value of the indoor air parameter that exceeds the air parameter standard. V 室内 Indicates the air volume in the room.

[0083] In a specific embodiment, it can be known through experiments that in the above formula, when the temperature difference is larger, the proportional opening is smaller, and when the concentration of the indoor air parameter is larger, the proportional opening is larger; but an appropriate value between the two needs to be taken as the proportional opening, so the temperature difference influence coefficient and the concentration influence coefficient are set as weight values ​​for adjustment.

[0084] Assume that K belongs to the second proportional opening, and the difference between the outdoor temperature (17°C) and the temperature range (20°C-25°C) at a certain moment is T 差 At 3°C, V 室内 40m 3 Among the indoor air parameters, formaldehyde exceeded the standard value the most, and the formaldehyde concentration exceeded the air standard concentration C by 1 mg / m 3 , ω is 0.3, α is 0.1, θ is 0.005, then K is 0.4, indicating that the air inlet duct or the air outlet duct is opened by 40%.

[0085] A control system for a fresh air air conditioner, the control system is applied to the fresh air air conditioner, the control system applies the control method as described above, the fresh air air conditioner is configured with a first air inlet duct, a second air inlet duct and an air outlet duct, the first air inlet duct and the second air inlet duct are both provided with an air inlet valve and an air inlet fan for adjusting indoor air intake, the first air inlet duct is provided with an air filter, and the air outlet duct is provided with an air outlet valve and an air outlet fan for adjusting indoor exhaust air;

[0086] like Figure 2 As shown, the control system includes:

[0087] Data acquisition module 1, used to obtain indoor and outdoor temperature values ​​and indoor air parameters;

[0088] The first control module 2 is used to compare the indoor air parameters with the preset air parameter standards. If there are parameters in the indoor air parameters that are higher than the air parameter standards, the air outlet valve and the air outlet fan of the air outlet duct are opened, and the air inlet valve and the air inlet fan of the first air inlet duct are opened;

[0089] The second control module 3 is used to compare the outdoor temperature value with the preset comfortable temperature range after opening the air inlet valve and the air inlet fan of the first air inlet duct, and determine whether to open the air inlet valve and the air inlet fan of the second air inlet duct according to the comparison result, and adjust the opening of all the air inlet valves and the air outlet valves to maintain the indoor temperature in the comfortable temperature range.

[0090] This embodiment realizes a control method and implementation process of a fresh air air conditioner. Please refer to the above embodiments and will not go into details here.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0092] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A control method for a fresh air air conditioner, characterized in that: The control method is applied to a fresh air air conditioner, wherein the fresh air air conditioner is provided with a first air inlet duct, a second air inlet duct and an air outlet duct, wherein the first air inlet duct and the second air inlet duct are both provided with an air inlet valve and an air inlet fan for adjusting indoor air intake, the first air inlet duct is provided with an air filter, and the air outlet duct is provided with an air outlet valve and an air outlet fan for adjusting indoor exhaust air; The control method comprises the following steps: S1: Obtain indoor and outdoor temperature values ​​and indoor air parameters; S2: comparing the indoor air parameters with the preset air parameter standards, if there are parameters in the indoor air parameters that are higher than the air parameter standards, opening the air outlet valve and the air outlet fan of the air outlet duct, and opening the air inlet valve and the air inlet fan of the first air inlet duct; S3: After opening the air inlet valve and the air inlet fan of the first air inlet duct, compare the outdoor temperature value with the preset comfortable temperature range, and determine whether to open the air inlet valve and the air inlet fan of the second air inlet duct according to the comparison result, and adjust the opening of all the air inlet valves and air outlet valves to maintain the indoor temperature in the comfortable temperature range.

2. The control method according to claim 1, characterized in that: The indoor air parameters include one or more of indoor CO2 concentration, PM2.5 concentration, formaldehyde concentration and CO concentration.

3. The control method according to claim 2, characterized in that: In step S2, it includes: When at least one parameter of the indoor air parameters is higher than the air parameter standard, if the outdoor temperature value is within the comfortable temperature range, the third operation is performed. During the execution of the third operation, if the indoor temperature value falls out of the comfortable temperature range, the third operation is stopped and the cooling or heating function is switched until the indoor temperature value is within the comfortable temperature range, and the third operation is re-executed until the indoor air parameter concentrations all meet the air parameter standard; The third operation includes adjusting the openings of the air inlet valves of the first air inlet duct and the second air inlet duct and the air outlet valve of the air outlet duct to a third proportional opening.

4. The control method according to claim 2, characterized in that: In step S3, it includes: When at least one parameter of the indoor air parameters is higher than the air parameter standard, and the outdoor temperature value is outside the comfortable temperature range, obtaining the difference between the outdoor temperature value and the lowest temperature value or the highest temperature value of the comfortable temperature range, and performing a first operation when the difference exceeds a maximum preset threshold; The first operation includes opening the air inlet fan of the first air inlet duct and the air outlet valve of the air outlet duct, adjusting the openings of the air inlet valve of the first air inlet duct and the air outlet valve of the air outlet duct to a first proportional opening, and closing the second air inlet duct; When executing the first operation, determine in real time whether the indoor temperature is within the comfortable temperature range. If not, stop executing the first operation and switch to the cooling or heating function until the indoor temperature value is within the comfortable temperature range. Then re-execute the first operation until the indoor air parameter concentration meets the air parameter standard.

5. The control method according to claim 2, characterized in that: In the step S3, it includes: When at least one parameter of the indoor air parameters is higher than the air parameter standard and the outdoor temperature value is outside the comfortable temperature range, obtaining the difference between the outdoor temperature value and the lowest temperature value or the highest temperature value of the comfortable temperature range, and when the difference exceeds a minimum preset threshold and is lower than a maximum preset threshold, performing a second operation; The second operation includes adjusting the opening of the air inlet valve of the first air inlet duct and the air outlet valve of the air outlet duct to a second proportional opening, opening the air inlet valve of the second air inlet duct and adjusting the opening to the first proportional opening; When executing the second operation, determine in real time whether the indoor temperature is within the comfortable temperature range. If not, stop executing the second operation and switch to the cooling or heating function until the indoor temperature value is within the comfortable temperature range. Then re-execute the second operation until the indoor air parameter concentration meets the air parameter standard.

6. The control method according to claim 2, characterized in that: In the step S3, it includes: When at least one of the indoor air parameters is higher than the air parameter standard, and the outdoor temperature value is outside the comfortable temperature range, determining the difference between the outdoor temperature value and the lowest temperature value or the highest temperature value of the comfortable temperature range, and when the difference is lower than or equal to the minimum preset threshold, performing a fourth operation; The fourth operation includes adjusting the openings of the air inlet valves of the first air inlet duct and the second air inlet duct and the air outlet valve of the air outlet duct to a fourth proportional opening; When executing the fourth operation, determine in real time whether the indoor temperature is within the comfortable temperature range. If not, stop executing the fourth operation and switch to the cooling or heating function until the indoor temperature value is within the comfortable temperature range. Then re-execute the fourth operation until the indoor air parameter concentration meets the air parameter standard.

7. The control method according to any one of claims 3 to 6, characterized in that: The proportional opening satisfies the relationship: Among them, K represents the proportional opening, ω represents the temperature difference influence coefficient, α represents the concentration influence coefficient, θ represents the indoor air capacity adjustment coefficient, T 差 It indicates the difference between the outdoor temperature and the lowest or highest temperature in the comfortable temperature range. C indicates the maximum concentration exceeding the air parameter standard. V 室内 Indicates the air volume in the room.

8. A control system for a fresh air air conditioner, characterized in that: The control system is applied to a fresh air air conditioner, and the control system is applied with a control method for a fresh air air conditioner as claimed in any one of claims 1 to 7, the fresh air air conditioner is provided with a first air inlet duct, a second air inlet duct and an air outlet duct, the first air inlet duct and the second air inlet duct are both provided with an air inlet valve and an air inlet fan for adjusting indoor air intake, the first air inlet duct is provided with an air filter, and the air outlet duct is provided with an air outlet valve and an air outlet fan for adjusting indoor exhaust air; A data acquisition module is used to obtain indoor and outdoor temperature values ​​and indoor air parameters; The first control module is used to compare the indoor air parameters with the preset air parameter standards, and if there are parameters in the indoor air parameters that are higher than the air parameter standards, the air outlet valve and the air outlet fan of the air outlet duct are opened, and the air inlet valve and the air inlet fan of the first air inlet duct are opened; The second control module is used to compare the outdoor temperature value with the preset comfortable temperature range after opening the air inlet valve and the air inlet fan of the first air inlet duct, determine whether to open the air inlet valve and the air inlet fan of the second air inlet duct according to the comparison result, and adjust the opening of all the air inlet valves and the air outlet valves to maintain the indoor temperature in the comfortable temperature range.

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