Control method for variable frequency compressor of variable frequency air conditioner

Abstract

The invention discloses a variable-frequency air conditioner variable-frequency compressor control method, and relates to the technical field of variable-frequency air conditioners, and the variable-frequency air conditioner variable-frequency compressor control method is characterized in that a variable-frequency compressor, a copper pipe, a four-way reversing valve, an outdoor condenser, an outdoor condensation fan, a throttling electronic expansion valve, an indoor evaporator and an indoor evaporation fan are included; the inverter compressor is provided with a refrigerant output end and a refrigerant input end, and the refrigerant output end of the inverter compressor is connected with one port of the four-way reversing valve through the copper pipe; a port of the four-way reversing valve is connected with the outdoor condenser through a copper pipe, and the outdoor condenser is connected with one end of the throttling electronic expansion valve through a copper pipe. And the compressor can operate at the most suitable frequency under different working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of variable - frequency air conditioners, and more specifically, it relates to a control method for a variable - frequency compressor of a variable - frequency air conditioner. Background Art

[0002] In modern life, air conditioners have become important household electrical appliances for improving the comfort of the indoor environment. With the continuous improvement of people's requirements for the quality of life and the enhancement of energy - saving awareness, variable - frequency air conditioners have gradually occupied a dominant position in the market due to their significant advantages.

[0003] During the operation of traditional fixed - frequency air conditioners, the compressor usually runs at a fixed frequency. When the indoor temperature reaches the set temperature, the compressor stops working; when the indoor temperature deviates from the set temperature by a certain range, the compressor restarts. This frequent start - stop not only causes large fluctuations in the indoor temperature, affecting the user's comfort experience, but also consumes a large amount of electric energy, reducing the energy utilization efficiency. At the same time, the frequent start - stop causes a large mechanical impact on core components such as the compressor, shortening the service life of the equipment and increasing the maintenance cost.

[0004] To solve these problems of fixed - frequency air conditioners, variable - frequency air conditioners came into being. Variable - frequency air conditioners adjust the refrigeration or heating capacity by changing the operating frequency of the compressor. However, there are still some deficiencies in the control of the compressor in existing variable - frequency air conditioners. For example, the monitoring of the indoor and outdoor environmental temperatures is not accurate enough, and it is unable to adjust the operating frequency of the compressor in a timely and accurate manner according to the actual temperature changes, resulting in unsatisfactory refrigeration or heating effects of the air conditioner and the failure to fully exert the energy - saving effect. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a control method for a variable - frequency compressor of a variable - frequency air conditioner.

[0006] To achieve the above - mentioned purpose, the present invention provides the following technical solutions:

[0007] A control method for a variable - frequency compressor of a variable - frequency air conditioner, including a variable - frequency compressor, a copper pipe, a four - way reversing valve, an outdoor condenser, an outdoor condensing fan, a throttling electronic expansion valve, an indoor evaporator, and an indoor evaporation fan;

[0008] The variable - frequency compressor has a refrigerant output end and a refrigerant input end, and the refrigerant output end of the variable - frequency compressor is connected to a port of the four - way reversing valve through the copper pipe;

[0009] The port of the four - way reversing valve is connected to the outdoor condenser through a copper pipe, the outdoor condenser is connected to one end of the throttling electronic expansion valve through a copper pipe, and the other end of the throttling electronic expansion valve is connected to one end of the indoor evaporator through a copper pipe;

[0010] The indoor evaporator is connected to one port of the four-way reversing valve through a copper pipe, and another port of the four-way reversing valve is connected to the refrigerant input end of the variable-frequency compressor through a copper pipe;

[0011] The outdoor condensing fan is arranged near the outdoor condenser;

[0012] The indoor evaporating fan is arranged near the indoor evaporator;

[0013] An indoor ambient temperature sensor is arranged near the indoor evaporating fan, and the indoor ambient temperature sensor is used to obtain the indoor ambient temperature Tao in real time;

[0014] An outdoor ambient temperature sensor is arranged near the outdoor condenser, and the outdoor ambient temperature sensor is used to obtain the outdoor ambient temperature Tai in real time;

[0015] Analyze the indoor ambient temperature Tao or the outdoor ambient temperature Tai to determine the operating frequency range of the variable-frequency compressor and control the operating frequency of the variable-frequency compressor.

[0016] Preferably, it further includes a liquid pipe stop valve and a gas pipe stop valve. The gas pipe stop valve is arranged on the copper pipe connecting the indoor evaporator and the four-way reversing valve, and the liquid pipe stop valve is arranged on the copper pipe connecting the throttling electronic expansion valve and the indoor evaporator.

[0017] Preferably, analyzing the indoor ambient temperature Tao or the outdoor ambient temperature Tai to determine the operating frequency range of the variable-frequency compressor and controlling the operating frequency of the variable-frequency compressor specifically includes the following steps:

[0018] Determine the operating frequency range of the variable-frequency compressor in the case of refrigeration or dehumidification according to the outdoor ambient temperature Tao;

[0019] Control the operating frequency of the variable-frequency compressor in the case of refrigeration or dehumidification according to the indoor ambient temperature Tai;

[0020] Determine the operating frequency range of the variable-frequency compressor in the case of heating according to the outdoor ambient temperature Tao;

[0021] Control the operating frequency of the variable-frequency compressor in the case of heating according to the indoor ambient temperature Tai.

[0022] Preferably, determining the operating frequency range of the variable-frequency compressor in the case of refrigeration or dehumidification according to the outdoor ambient temperature Tao specifically includes the following steps:

[0023] Compare the outdoor ambient temperature Tao with the preset first temperature threshold T0, second temperature threshold T2, third temperature threshold T3, fourth temperature threshold T4, fifth temperature threshold T5 and sixth temperature threshold T6:

[0024] If the outdoor ambient temperature Tao ≥ the preset first temperature threshold T0, the maximum operating frequency of the compressor is limited to the first frequency Q1, and the minimum operating frequency limit of the compressor is the fifth frequency Q5;

[0025] If the preset second temperature threshold T2 ≤ the outdoor ambient temperature Tao < the preset first temperature threshold T0, the maximum operating frequency limit of the compressor is determined by linear fitting according to the first formula, and the minimum operating frequency limit of the compressor is the fifth frequency Q5, where the first formula

[0026] If the preset third temperature threshold T3 ≤ the outdoor ambient temperature Tao < the preset second temperature threshold T2, the maximum operating frequency limit of the compressor is the second frequency Q2, and the minimum operating frequency limit of the compressor is the fifth frequency Q6;

[0027] If the preset fourth temperature threshold T4 ≤ the outdoor ambient temperature Tao < the preset third temperature threshold T3, the maximum operating frequency limit of the compressor is determined by linear fitting according to the second formula, where the second formula The minimum operating frequency limit of the compressor is the fifth frequency Q6;

[0028] If the preset fifth temperature threshold T5 ≤ the outdoor ambient temperature Tao < the preset fourth temperature threshold T4, then the maximum operating frequency limit of the compressor is determined by linear fitting according to the third formula, where the second formula The minimum operating frequency limit of the compressor is the fifth frequency Q6;

[0029] If the preset sixth temperature threshold T6 ≤ the outdoor ambient temperature Tao < the preset fifth temperature threshold T5, the maximum operating frequency limit of the compressor is the fourth frequency Q4, and the minimum operating frequency limit of the compressor is the fifth frequency Q6;

[0030] Wherein, the first frequency Q1 is greater than the second frequency Q2, the second frequency Q2 is greater than the third frequency Q3, the third frequency Q3 is greater than the fourth frequency Q4, the fourth frequency Q4 is greater than the fifth frequency Q5, and the fifth frequency Q5 is greater than the sixth frequency Q6.

[0031] Preferably, the operating frequency of the variable-frequency compressor is controlled according to the indoor ambient temperature Tai in the refrigeration or dehumidification condition, which specifically includes the following steps:

[0032] Within the preset startup time, the first temperature difference Δt1 is calculated according to the fourth formula Δt1 = Tai - T1 + E1, and the operating frequency of the variable-frequency compressor (1) is obtained by looking up the temperature difference - frequency table with the first temperature difference Δt1, where T1 is the set temperature in the refrigeration or dehumidification condition, and E1 is the temperature difference correction temperature in the refrigeration or dehumidification mode;

[0033] After the preset start-up time, the target frequency during the operation of the variable-frequency compressor is calculated according to the stepless adjustment formula for variable-frequency output.

[0034] Preferably, the operating frequency range of the variable-frequency compressor in the heating case is determined according to the outdoor ambient temperature Tao, which specifically includes the following steps:

[0035] Compare the outdoor ambient temperature Tao with the preset seventh temperature threshold T7, eighth temperature threshold T8, ninth temperature threshold T9, tenth temperature threshold T 10 , eleventh temperature threshold T 11 and twelfth temperature threshold T 12 as follows:

[0036] If the outdoor ambient temperature Tao < the preset seventh temperature threshold T7, the maximum operating frequency of the compressor is limited to the seventh frequency Q7;

[0037] If the preset seventh temperature threshold T7 ≤ the outdoor ambient temperature Tao < the preset eighth temperature threshold T8, the maximum operating frequency of the compressor is determined by linear fitting according to the fifth formula, where the fifth formula

[0038] If the preset eighth temperature threshold T8 ≤ the outdoor ambient temperature Tao < the preset ninth temperature threshold T9, the maximum operating frequency of the compressor is determined by linear fitting according to the sixth formula, where the sixth formula

[0039] If the preset ninth temperature threshold T9 ≤ the outdoor ambient temperature Tao < the preset tenth temperature threshold T 10 , the maximum operating frequency of the compressor is determined by linear fitting according to the seventh formula, where the seventh formula

[0040] If the preset tenth temperature threshold T 10 ≤ the outdoor ambient temperature Tao < the preset eleventh temperature threshold T 11 , the maximum operating frequency of the compressor is determined by linear fitting according to the eighth formula, where the eighth formula

[0041] If the preset eleventh temperature threshold T 11 ≤ the outdoor ambient temperature Tao < the preset twelfth temperature threshold T 12 , the maximum operating frequency of the compressor is limited to the eleventh frequency Q 11 ;

[0042] Among them, the seventh frequency Q7 is greater than the eighth frequency Q8, the eighth frequency Q8 is greater than the ninth frequency Q9, the ninth frequency Q9 is greater than the tenth frequency Q 10 , the tenth frequency Q10 Greater than the eleventh frequency Q 11 。

[0043] Preferably, the operating frequency of the variable-frequency compressor is controlled according to the indoor ambient temperature Tai in the heating mode, which specifically includes the following steps:

[0044] Within the preset startup time, calculate the second temperature difference Δt2 according to the ninth formula Δt2 = T1′ - Tai + E2, and look up the temperature difference-frequency table with the second temperature difference Δt2 to obtain the operating frequency of the variable-frequency compressor (1); where, T′1 is the indoor set temperature in the heating mode, and E2 is the heating temperature correction temperature;

[0045] After the preset startup time, calculate the target frequency during the operation of the variable-frequency compressor according to the stepless adjustment formula of variable-frequency output.

[0046] Preferably, after the preset startup time, calculate the target frequency during the operation of the variable-frequency compressor according to the stepless adjustment formula of variable-frequency output, specifically:

[0047] According to the stepless adjustment formula of variable-frequency output F n =F n-1 +K1×ΔT n +K2×(ΔT n -ΔT n-1 ) to obtain the target frequency F during the operation of the variable-frequency compressor n ;

[0048] where, F n-1 represents the current frequency, ΔT n is the difference between the current temperature and the indoor ambient temperature Tai, ΔT n-1 represents the difference between the previous temperature and the indoor ambient temperature Tai, and K1 and K2 represent the influence weights.

[0049] Preferably, the indoor ambient temperature sensor is used to obtain the indoor ambient temperature Tao in real time, which specifically includes the following steps:

[0050] Identify the thermally radiated difference regions in the indoor environment, and obtain the initial temperature information and area information of each thermally radiated difference region in the indoor environment. Take values and mark the initial temperature information of each thermally radiated difference region to obtain the initial temperature value Take values and mark the area information of each thermally radiated difference region in the indoor environment to obtain the area value M P , where, p represents the label of each thermally radiated difference region, and the value of p is a positive integer;

[0051] Calculate the indoor ambient temperature Tao through the temperature calculation formula , where, m represents the total number of thermally radiated difference regions.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] In the present invention, by real-time monitoring the indoor and outdoor environmental temperatures and analyzing and determining the operating frequency range and specific operating frequency of the variable-frequency compressor accordingly, the compressor can operate at the most suitable frequency under different working conditions. When the indoor and outdoor temperatures are relatively low and the refrigeration or heating demand is small, the operating frequency of the compressor is reduced to reduce energy consumption; when the demand is high, the frequency is increased to quickly reach the set temperature. Compared with the fixed-frequency air conditioner with frequent start-stop and fixed-power operation, it can effectively save electric energy and improve the energy utilization efficiency.

[0054] The indoor environmental temperature sensor obtains the indoor environmental temperature in real time, and the outdoor environmental temperature sensor obtains the outdoor environmental temperature in real time, providing accurate temperature data for the air conditioner control system. Based on these data to control the operating frequency of the variable-frequency compressor can make the indoor temperature more accurately maintained near the set value, avoid temperature fluctuations, and create a more comfortable and stable indoor environment for users.

[0055] When the indoor and outdoor environmental temperatures change, the control system can quickly analyze and adjust the operating frequency of the variable-frequency compressor. During the start-up stage of the air conditioner or when the indoor temperature changes greatly, the compressor frequency can be quickly increased to make the air conditioner quickly achieve the refrigeration or heating effect, timely meet the user's demand for indoor temperature, and improve the user experience.

[0056] The frequent start-stop of the fixed-frequency air conditioner will cause greater impact and wear on components such as the compressor, shortening the service life of the equipment. While this variable-frequency air conditioner reduces the start-stop times and the mechanical stress borne by the components through the smooth adjustment of the compressor operating frequency, reduces the risk of component damage, thereby extending the overall service life of the air conditioner equipment and reducing the maintenance and replacement costs of the equipment.

[0057] Reasonable control of the compressor operating frequency helps to maintain the stable operation of the entire refrigeration cycle system. By precisely adjusting the flow rate and circulation speed of the refrigerant, it ensures that components such as the outdoor condenser, throttle electronic expansion valve, and indoor evaporator work under suitable working conditions, improves the stability and reliability of the system, and reduces the probability of failures caused by system instability.

[0058] The invention combines PI control and the E-square parameters of the control board to control the operating frequency of the variable-frequency compressor, which is more convenient for the control board to process. It is relatively ideal to control the maximum and minimum operating frequencies of the variable-frequency compressor, and the air conditioner can quickly cool and heat and save energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 It is a schematic diagram of the control method of the variable-frequency compressor of the variable-frequency air conditioner proposed by the present invention.

[0060] 1. Variable-frequency compressor; 2. Copper pipe; 3. Four-way reversing valve; 4. Outdoor condenser; 5. Outdoor condensing fan; 6. Throttle electronic expansion valve; 7. Liquid pipe stop valve; 8. Gas pipe stop valve; 9. Indoor evaporator; 10. Indoor evaporation fan. Detailed implementation mode

[0061] Refer to Figure 1 as shown.

[0062] Example 1 further illustrates the variable-frequency compressor control method of the variable-frequency air conditioner proposed by the present invention.

[0063] The variable-frequency compressor control method of the variable-frequency air conditioner includes a variable-frequency compressor 1, a copper pipe 2, a four-way reversing valve 3, an outdoor condenser 4, an outdoor condensing fan 5, a throttle electronic expansion valve 6, an indoor evaporator 9 and an indoor evaporation fan 10;

[0064] The variable-frequency compressor 1 has a refrigerant output end and a refrigerant input end. The refrigerant output end of the variable-frequency compressor 1 is connected to a port of the four-way reversing valve 3 through the copper pipe 2;

[0065] The port of the four-way reversing valve 3 is connected to the outdoor condenser 4 through the copper pipe 2. The outdoor condenser 4 is connected to one end of the throttle electronic expansion valve 6 through the copper pipe 2. The other end of the throttle electronic expansion valve 6 is connected to one end of the indoor evaporator 9 through the copper pipe 2;

[0066] The indoor evaporator 9 is connected to a port of the four-way reversing valve 3 through the copper pipe 2. The other port of the four-way reversing valve 3 is connected to the refrigerant input end of the variable-frequency compressor 1 through the copper pipe 2;

[0067] The outdoor condensing fan 5 is arranged near the outdoor condenser 4;

[0068] The indoor evaporation fan 10 is arranged near the indoor evaporator 9;

[0069] An indoor ambient temperature sensor is arranged near the indoor evaporation fan 10. The indoor ambient temperature sensor is used to obtain the indoor ambient temperature Tao in real time;

[0070] An outdoor ambient temperature sensor is arranged near the outdoor condenser 4. The outdoor ambient temperature sensor is used to obtain the outdoor ambient temperature Tai in real time;

[0071] Analyze the indoor ambient temperature Tao or the outdoor ambient temperature Tai to determine the operating frequency range of the variable-frequency compressor 1 and control the operating frequency of the variable-frequency compressor 1.

[0072] The main components involved in the variable-frequency compressor control method of this application for variable-frequency air conditioners include a variable-frequency compressor, a copper pipe, a four-way reversing valve, an outdoor condenser, an outdoor condensing fan, a throttling electronic expansion valve, an indoor evaporator, and an indoor evaporator fan. The variable-frequency compressor has a refrigerant output end and a refrigerant input end, and is connected to other components through a copper pipe to form a complete refrigeration cycle system. At the same time, an indoor ambient temperature sensor is set near the indoor evaporator to obtain the indoor ambient temperature Tao in real time; an outdoor ambient temperature sensor is set near the outdoor condenser to obtain the outdoor ambient temperature Tai in real time. By analyzing these two temperatures, the operating frequency range of the variable-frequency compressor is determined, and its operating frequency is controlled.

[0073] Suppose in summer, the initial indoor temperature Tao is 30°C, the set temperature is 25°C, and the outdoor ambient temperature Tao is 35°C. After the air conditioner is started, the indoor ambient temperature sensor detects that the indoor temperature Tao is 30°C. At this time, the control system judges that it is necessary to quickly reduce the indoor temperature according to the indoor-outdoor temperature difference and the preset control strategy. The variable-frequency compressor operates at a higher frequency, and the refrigerant output end quickly outputs refrigerant, which enters the four-way reversing valve through the copper pipe. The four-way reversing valve directs the refrigerant to the outdoor condenser.

[0074] Refrigeration cycle process: In the outdoor condenser, the high-temperature and high-pressure refrigerant gas exchanges heat with the outdoor air and quickly dissipates heat and condenses into a liquid under the action of the outdoor condensing fan. The liquid refrigerant flows through the copper pipe and becomes a low-temperature and low-pressure gas-liquid two-phase mixture, which enters the indoor evaporator. In the indoor evaporator, the refrigerant absorbs the heat of the indoor air and evaporates into a gas. At the same time, the indoor evaporator fan blows the indoor air over the evaporator to reduce the indoor air temperature. The evaporated refrigerant gas returns to the refrigerant input end of the variable-frequency compressor through the copper pipe to complete a refrigeration cycle.

[0075] Frequency adjustment stage: As the refrigeration process progresses, the indoor temperature gradually decreases. When the indoor temperature drops to 27°C, the control system appropriately reduces the operating frequency of the variable-frequency compressor according to the change rate of the indoor temperature and the difference from the set temperature. At this time, the circulation volume of the refrigerant decreases accordingly, but it can still meet the demand for indoor cooling, and at the same time, the energy consumption of the compressor is reduced. When the indoor temperature approaches the set temperature of 25°C, such as reaching 25.5°C, the compressor operating frequency is further reduced to keep the indoor temperature stable with a lower power consumption.

[0076] Suppose in winter, the initial indoor temperature Tao is 10°C, the set temperature is 20°C, and the outdoor ambient temperature Tai is 0°C. After the air conditioner is turned on to the heating mode, the control system sets the operating frequency of the variable-frequency compressor at a higher value according to the indoor-outdoor temperature difference. The variable-frequency compressor works, and the refrigerant circulates in the system. At this time, the four-way reversing valve changes the flow direction of the refrigerant so that the refrigerant first enters the indoor evaporator.

[0077] Heating cycle process: The high-temperature and high-pressure refrigerant gas enters the indoor evaporator. Under the action of the indoor evaporation fan, it releases heat to the indoor air, increasing the indoor air temperature, and the refrigerant gas condenses into a liquid. The liquid refrigerant flows through the copper pipe into the throttling electronic expansion valve, and after pressure reduction, it enters the outdoor condenser. In the outdoor condenser, the refrigerant absorbs the heat of the outdoor air and evaporates into a gas, and the outdoor condensation fan assists in heat dissipation. The evaporated refrigerant gas returns to the refrigerant input end of the variable-frequency compressor through the four-way reversing valve.

[0078] Frequency adjustment stage: When the indoor temperature rises from 10°C to 15°C, the operating frequency of the variable-frequency compressor is adjusted according to the change of the indoor temperature. As the indoor temperature continues to rise and approaches the set temperature of 20°C, when it reaches 19°C, the frequency is further reduced to maintain the stability of the indoor temperature.

[0079] Embodiment 2 adds the following technical features on the basis of Embodiment 1:

[0080] The control method of the variable-frequency compressor of the variable-frequency air conditioner further includes a liquid pipe stop valve 7 and a gas pipe stop valve 8. The gas pipe stop valve 8 is arranged on the copper pipe 2 connecting the indoor evaporator 9 and the four-way reversing valve 3, and the liquid pipe stop valve 7 is arranged on the copper pipe 2 connecting the throttling electronic expansion valve 6 and the indoor evaporator 9.

[0081] When this application needs to maintain, repair or replace relevant components such as the indoor evaporator 9 and the throttling electronic expansion valve 6, the liquid pipe stop valve 7 can be closed. This can cut off the refrigerant liquid flow from the throttling electronic expansion valve 6 to the indoor evaporator 9, relatively isolate the indoor evaporator 9 from other parts of the refrigeration cycle system, facilitate the maintenance personnel to operate on specific components without affecting other parts of the whole system, and at the same time can also avoid a large amount of refrigerant leakage, reducing the complexity and cost of maintenance. During the operation of the air conditioner, the liquid pipe stop valve 7 can moderately adjust the opening degree according to the system operation condition, thereby controlling the flow rate of the refrigerant liquid. This helps to maintain the pressure balance between the throttling electronic expansion valve 6 and the indoor evaporator 9, ensuring that the refrigerant enters the indoor evaporator 9 with appropriate flow rate and pressure, and guaranteeing the stability of the refrigeration or heating effect.

[0082] When repairing relevant components such as the indoor evaporator 9 and the four-way reversing valve 3, by closing the gas pipe stop valve 8, the refrigerant gas flow from the indoor evaporator 9 to the four-way reversing valve 3 can be cut off, isolating the relevant components from other parts of the system, facilitating the repair operation and reducing the refrigerant loss.

[0083] When the air conditioner is operating, the gas pipe stop valve 8 can adjust the flow rate of the refrigerant gas according to parameters such as system pressure and flow rate. For example, when the cooling or heating demand changes, by adjusting the opening degree of the gas pipe stop valve 8, the flow rate of the refrigerant gas can be matched with the operating frequency of the variable-frequency compressor and the heat exchange demand between the indoor and outdoor, optimizing the cooling or heating performance of the system and improving the energy efficiency ratio.

[0084] The gas pipe stop valve 8 can prevent the reverse flow of the refrigerant gas under specific circumstances (such as when the air conditioner stops), avoiding abnormal system pressure caused by the reverse flow of the refrigerant and potential risks of equipment damage, and ensuring the safe and stable operation of the air conditioner system.

[0085] Embodiment 3 adds the following technical features on the basis of Embodiment 2:

[0086] A control method for the variable-frequency compressor of a variable-frequency air conditioner analyzes the indoor ambient temperature Tao or the outdoor ambient temperature Tai to determine the operating frequency range of the variable-frequency compressor 1 and controls the operating frequency of the variable-frequency compressor 1. The specific steps include the following:

[0087] Determine the operating frequency range of the variable-frequency compressor 1 in the case of cooling or dehumidification according to the outdoor ambient temperature Tao;

[0088] Control the operating frequency of the variable-frequency compressor 1 according to the indoor ambient temperature Tai in the case of cooling or dehumidification;

[0089] Determine the operating frequency range of the variable-frequency compressor 1 in the case of heating according to the outdoor ambient temperature Tao;

[0090] Control the operating frequency of the variable-frequency compressor 1 according to the indoor ambient temperature Tai in the case of heating.

[0091] This control method for the variable-frequency compressor of a variable-frequency air conditioner, on the basis of a system composed of existing components such as a variable-frequency compressor, copper pipes, a four-way reversing valve, an outdoor condenser, an outdoor condensing fan, a throttling electronic expansion valve, an indoor evaporator, an indoor evaporating fan, and a liquid pipe stop valve and a gas pipe stop valve, determines the operating frequency range of the variable-frequency compressor and controls its operating frequency through the analysis of the indoor ambient temperature Tai and the outdoor ambient temperature Tao. The specific steps include: determining the operating frequency range of the variable-frequency compressor in the case of cooling or dehumidification and heating according to the outdoor ambient temperature Tai; controlling the operating frequency of the variable-frequency compressor respectively in the cases of cooling, dehumidification, and heating according to the indoor ambient temperature Tao.

[0092] Embodiment 4 adds the following technical features on the basis of Embodiment 3:

[0093] A control method for the variable-frequency compressor of a variable-frequency air conditioner determines the operating frequency range of the variable-frequency compressor 1 in the case of cooling or dehumidification according to the outdoor ambient temperature Tao. The specific steps include the following:

[0094] Compare the outdoor ambient temperature Tao with the preset first temperature threshold T0, second temperature threshold T2, third temperature threshold T3, fourth temperature threshold T4, fifth temperature threshold T5, and sixth temperature threshold T6:

[0095] If the outdoor ambient temperature Tao ≥ the preset first temperature threshold T0, the maximum operating frequency limit of the compressor is the first frequency Q1, and the minimum operating frequency limit of the compressor is the fifth frequency Q5;

[0096] If the preset second temperature threshold T2 ≤ the outdoor ambient temperature Tao < the preset first temperature threshold T0, the maximum operating frequency limit of the compressor is determined by linear fitting according to the first formula, and the minimum operating frequency limit of the compressor is the fifth frequency Q5, where the first formula

[0097] If the preset third temperature threshold T3 ≤ the outdoor ambient temperature Tao < the preset second temperature threshold T2, the maximum operating frequency limit of the compressor is the second frequency Q2, and the minimum operating frequency limit of the compressor is the fifth frequency Q6;

[0098] If the preset fourth temperature threshold T4 ≤ the outdoor ambient temperature Tao < the preset third temperature threshold T3, the maximum operating frequency limit of the compressor is determined by linear fitting according to the second formula, where the second formula The minimum operating frequency limit of the compressor is the fifth frequency Q6;

[0099] If the preset fifth temperature threshold T5 ≤ the outdoor ambient temperature Tao < the preset fourth temperature threshold T4, then the maximum operating frequency limit of the compressor is determined by linear fitting according to the third formula, where the second formula The minimum operating frequency limit of the compressor is the fifth frequency Q6;

[0100] If the preset sixth temperature threshold T6 ≤ the outdoor ambient temperature Tao < the preset fifth temperature threshold T5, the maximum operating frequency limit of the compressor is the fourth frequency Q4, and the minimum operating frequency limit of the compressor is the fifth frequency Q6;

[0101] Among them, the first frequency Q1 is greater than the second frequency Q2, the second frequency Q2 is greater than the third frequency Q3, the third frequency Q3 is greater than the fourth frequency Q4, the fourth frequency Q4 is greater than the fifth frequency Q5, and the fifth frequency Q5 is greater than the sixth frequency Q6.

[0102] This application divides different frequency ranges precisely according to the outdoor ambient temperature, enabling the compressor to operate at an appropriate frequency under different temperature conditions. It does not consume excessive energy at high temperatures and can also utilize energy reasonably at low temperatures. Compared with traditional fixed-frequency settings or simple temperature-frequency correspondence methods, it greatly improves the energy utilization efficiency and reduces the user's electricity cost.

[0103] This method sets clear upper and lower limits for the operating frequency of the compressor, avoiding system instability problems caused by too high or too low frequencies. Under different outdoor temperature conditions, it can ensure the stable operation of the air-conditioning system, reduce the occurrence probability of equipment failures, and extend the service life of the air conditioner.

[0104] It can adapt to various complex outdoor temperature environments. Whether it is extremely high temperature or relatively low temperature, it can set a reasonable frequency range to enable the air conditioner to meet the indoor cooling or dehumidification needs. It enhances the adaptability of the air conditioner under different geographical and seasonal conditions and improves the user's experience.

[0105] By using methods such as linear fitting, it finely adjusts the maximum operating frequency of the compressor according to the change of the outdoor temperature, achieving precise control of the cooling or dehumidification capacity of the air conditioner. It can better meet the precise requirements of the indoor environment for temperature and humidity and improve the comfort of the indoor environment.

[0106] In summary, this method of determining the operating frequency range of the variable-frequency compressor according to the outdoor ambient temperature has significant advantages in terms of energy conservation, stability, adaptability, and precise control, providing strong technical support for the performance improvement of variable-frequency air conditioners.

[0107] Embodiment 5 adds the following technical features on the basis of Embodiment 4:

[0108] A control method for the variable-frequency compressor of a variable-frequency air conditioner controls the operating frequency of the variable-frequency compressor 1 in the case of refrigeration or dehumidification according to the indoor ambient temperature Tai, specifically including the following steps:

[0109] Within the preset startup time, calculate the first temperature difference Δt1 according to the fourth formula Δt1 = Tai - T1 + E1, and look up the temperature difference-frequency table with the first temperature difference Δt1 to obtain the operating frequency of the variable-frequency compressor (1), where T1 is the set temperature in the case of refrigeration or dehumidification, and E1 is the temperature difference correction temperature for the refrigeration or dehumidification mode;

[0110] The temperature difference-frequency table is as follows:

[0111]

[0112] After the preset startup time, calculate the target frequency when the variable-frequency compressor 1 operates according to the variable-frequency output stepless adjustment formula.

[0113] Within the preset startup time, by setting the frequency based on the temperature difference, this application enables the compressor to quickly operate at a high frequency, rapidly reducing the indoor temperature or removing indoor moisture, meeting the user's demand for quickly adjusting the indoor environment and enhancing the user experience.

[0114] After the preset startup time, the stepless adjustment formula of variable-frequency output is adopted to adjust the operation frequency of the compressor in real time according to the subtle changes in the indoor ambient temperature. When the indoor temperature approaches the set temperature, the operation frequency is reduced to reduce the energy consumption of the compressor. Compared with the traditional fixed-frequency operation method or simple frequency adjustment method, it can significantly reduce the power consumption of the air conditioner, achieve energy-saving effects, and save electricity costs for users.

[0115] Whether in the cooling or dehumidification mode, this control method can closely adjust the frequency around the indoor ambient temperature, enabling the indoor temperature to be more accurately maintained near the set temperature, avoiding large fluctuations in temperature, and creating a more comfortable and stable indoor environment for users.

[0116] By setting different parameters and the temperature difference - frequency table, it can be flexibly adjusted according to different air conditioner models, usage environments, and user requirements, with strong adaptability and the ability to meet diverse application scenarios.

[0117] Since the operation frequency of the compressor can be reasonably adjusted according to actual needs, it avoids long-term high-load operation or frequent start-stop, reduces the wear of the compressor and other related components, thereby extending the overall service life of the air conditioning equipment and reducing the equipment maintenance and replacement costs.

[0118] In summary, this method of controlling the operation frequency of a variable-frequency compressor according to the indoor ambient temperature in the cooling or dehumidification situation has obvious advantages in terms of high efficiency, energy saving, comfort, adaptability, and equipment life, and is of great significance for improving the comprehensive performance of variable-frequency air conditioners.

[0119] Embodiment Six adds the following technical features on the basis of Embodiment Five:

[0120] A method for controlling a variable-frequency compressor of a variable-frequency air conditioner to determine the operation frequency range of the variable-frequency compressor 1 in the heating situation according to the outdoor ambient temperature Tao, specifically including the following steps:

[0121] Compare the outdoor ambient temperature Tao with the preset seventh temperature threshold T7, eighth temperature threshold T8, ninth temperature threshold T9, tenth temperature threshold T 10 , eleventh temperature threshold T 11 and twelfth temperature threshold T 12 :

[0122] If the outdoor ambient temperature Tao < the preset seventh temperature threshold T7, the maximum operating frequency of the compressor is limited to the seventh frequency Q7;

[0123] If the preset seventh temperature threshold T7 ≤ outdoor ambient temperature Tao < the preset eighth temperature threshold T8, the maximum operating frequency limit of the compressor is determined by linear fitting according to the fifth formula, where the fifth formula

[0124] If the preset eighth temperature threshold T8 ≤ outdoor ambient temperature Tao < the preset ninth temperature threshold T9, the maximum operating frequency limit of the compressor is determined by linear fitting according to the sixth formula, where the sixth formula

[0125] If the preset ninth temperature threshold T9 ≤ outdoor ambient temperature Tao < the preset tenth temperature threshold T 10 , the maximum operating frequency limit of the compressor is determined by linear fitting according to the seventh formula, where the seventh formula

[0126] If the preset tenth temperature threshold T 10 ≤ outdoor ambient temperature Tao < the preset eleventh temperature threshold T 11 , the maximum operating frequency limit of the compressor is determined by linear fitting according to the eighth formula, where the eighth formula

[0127] If the preset eleventh temperature threshold T 11 ≤ outdoor ambient temperature Tao < the preset twelfth temperature threshold T 12 , the maximum operating frequency of the compressor is limited to the eleventh frequency Q 11 ;

[0128] Among them, the seventh frequency Q7 is greater than the eighth frequency Q8, the eighth frequency Q8 is greater than the ninth frequency Q9, the ninth frequency Q9 is greater than the tenth frequency Q 10 , the tenth frequency Q 10 is greater than the eleventh frequency Q 11 .

[0129] In this application, under different outdoor temperature conditions, the maximum operating frequency limit of the compressor can be reasonably adjusted according to the temperature situation, ensuring sufficient heating capacity in extremely cold environments, quickly raising the indoor temperature, and meeting the user's demand for a warm indoor environment.

[0130] By finely dividing the frequency range according to the outdoor temperature and making linear fitting adjustments, it is avoided that the compressor operates at too high a frequency under unnecessary circumstances, reducing energy consumption. When the outdoor temperature is relatively high, the operating frequency is reduced to achieve energy-saving effects and reduce the user's heating cost.

[0131] The clear frequency limit rules provide a stable framework for the operation of the compressor, avoiding system instability problems caused by unreasonable frequency settings. Whether in extremely low temperatures or relatively mild temperature environments, it can ensure the stable and reliable operation of the air-conditioning system, reduce the probability of equipment failures, and extend the service life of the air conditioner.

[0132] This method can adapt to a wide range of outdoor temperature conditions. From extremely cold to relatively warm environments, through corresponding frequency setting strategies, the air conditioner can operate efficiently under various climate conditions, enhancing the environmental adaptability of the air conditioner and meeting the heating requirements of users in different regions in winter.

[0133] Using the linear fitting formula to precisely adjust the maximum operating frequency of the compressor according to the change of outdoor temperature, it realizes the precise control of the heating capacity of the air conditioner. It can better match the indoor heating demand, maintain the stability of the indoor temperature, and improve the comfort of users.

[0134] In summary, this method of determining the operating frequency range of the variable-frequency compressor in the heating mode according to the outdoor environmental temperature has significant advantages in terms of heating efficiency, energy conservation, stability, adaptability, and precise control, providing a strong guarantee for improving the performance of variable-frequency air conditioners in winter.

[0135] Embodiment Seven adds the following technical features on the basis of Embodiment Six:

[0136] A control method for the variable-frequency compressor of a variable-frequency air conditioner, which controls the operating frequency of the variable-frequency compressor 1 in the heating mode according to the indoor environmental temperature Tai, specifically including the following steps:

[0137] Within the preset startup time, calculate the second temperature difference Δt2 according to the ninth formula Δt2 = T1′ - Tai + E2, and look up the temperature difference - frequency table with the second temperature difference Δt2 to obtain the operating frequency of the variable-frequency compressor (1); where, T′1 is the indoor set temperature in the heating mode, and E2 is the heating temperature correction temperature;

[0138] The temperature difference - frequency table is as follows:

[0139]

[0140] After the preset startup time, calculate the target frequency during the operation of the variable-frequency compressor 1 according to the variable-frequency output stepless adjustment formula.

[0141] After the preset startup time, calculate the target frequency during the operation of the variable-frequency compressor 1 according to the variable-frequency output stepless adjustment formula, specifically as follows:

[0142] According to the variable-frequency output stepless adjustment formula F n =F n-1+K1×ΔT n +K2×(ΔT n -ΔT n-1 ) to obtain the target frequency F of the variable-frequency compressor 1 during operation n ;

[0143] Among them, F n-1 represents the current frequency, and ΔT n is the difference between the current temperature and the indoor ambient temperature Tai, and ΔT n-1 represents the difference between the previous temperature and the indoor ambient temperature Tai, and K1 and K2 represent the influence weights.

[0144] The following table shows the values of each parameter:

[0145]

[0146]

[0147] In the preset startup time of this application, a relatively high operating frequency is quickly determined based on the temperature difference, enabling the compressor to quickly start working and rapidly increase the indoor temperature, meeting the user's demand for rapid temperature rise and greatly shortening the time for the indoor to reach a comfortable temperature.

[0148] After the preset startup time, an infinitely variable regulation formula for variable-frequency output is adopted to adjust the operating frequency of the compressor in real-time and accurately according to the dynamic change of the indoor temperature. When the indoor temperature approaches the set temperature, the operating frequency is reduced to reduce unnecessary energy consumption; while when the temperature changes greatly, the frequency can be adjusted in time to maintain the heating effect. Compared with traditional fixed-frequency or simple adjustment methods, it significantly reduces energy consumption and saves the user's electricity bill.

[0149] This control method adjusts the frequency closely around the indoor ambient temperature, and can accurately maintain the indoor temperature near the set temperature, effectively avoiding large fluctuations in temperature. Whether during the temperature rise or fall process, the indoor temperature can be kept stable by adjusting the compressor frequency in time, creating a comfortable and pleasant indoor environment for users.

[0150] By setting different parameters and the temperature difference - frequency table, it can be flexibly adjusted according to different air conditioner models, room sizes, insulation conditions, and user personalized needs. It can adapt to diverse indoor environments and usage scenarios, and has strong versatility and adaptability.

[0151] The reasonable frequency adjustment strategy avoids the compressor from running under high load or frequent start-stop conditions for a long time, reducing the wear and mechanical stress of the compressor and related components. This helps to extend the overall service life of the air conditioner equipment, reduce the equipment maintenance and replacement costs, and improve the reliability and stability of the equipment.

[0152] In summary, this method of controlling the operating frequency of a variable-frequency compressor according to the indoor environmental temperature during heating shows obvious advantages in terms of efficient heating, energy conservation, temperature control, adaptability, and equipment lifespan. It has important significance and application value for improving the comprehensive performance of variable-frequency air conditioners.

[0153] Embodiment 8 adds the following technical features on the basis of Embodiment 7:

[0154] For the variable-frequency compressor control method of a variable-frequency air conditioner, an indoor environmental temperature sensor is used to obtain the indoor environmental temperature Tao in real time, and it specifically includes the following steps:

[0155] Identify the heat radiation difference regions in the indoor environment, and obtain the initial temperature information and area information of each heat radiation difference region in the indoor environment. Take values and mark the initial temperature information of each heat radiation difference region to obtain the initial temperature value Take values and mark the area information of each heat radiation difference region in the indoor environment to obtain the area value M P , where p represents the label of each heat radiation difference region, and the value of p is a positive integer;

[0156] Calculate the indoor environmental temperature Tao through the temperature calculation formula , where m represents the total number of heat radiation difference regions.

[0157] The traditional single temperature sensor can only reflect the temperature at the installation position, while this solution takes into account the temperature and area of different heat radiation difference regions in the room. The indoor environmental temperature calculated through weighted calculation can more comprehensively and accurately reflect the actual temperature situation of the entire room. It avoids inaccurate air conditioner control caused by local temperature deviation and provides a more practical indoor environment for users.

[0158] Based on the accurate indoor environmental temperature to control the operating frequency of the variable-frequency compressor, the cooling or heating effect of the air conditioner can be more in line with the actual indoor needs. There will be no situation of overcooling or overheating in some areas, effectively improving the comfort of the indoor environment and meeting the requirements of users for a comfortable living environment.

[0159] Accurate temperature information helps the air conditioner system to more reasonably adjust the operating frequency of the compressor. Reduce the frequency when high power operation is not required to reduce energy consumption; promptly increase the frequency when the temperature deviation is large to quickly reach the set temperature. Compared with the operation of the air conditioner under the traditional temperature acquisition method, it can effectively reduce energy consumption, improve energy utilization efficiency, and save the electricity cost of users.

[0160] This method is applicable to indoor spaces with various layouts and environments. Whether it is a large open space or a complexly partitioned room, the indoor environmental temperature can be accurately calculated by reasonably dividing the regions with different heat radiation differences. It has strong adaptability and versatility, and can meet the needs of different users and scenarios.

[0161] The accurate temperature calculation provides more reliable data support for the air-conditioning control system, which helps to further optimize the control strategies and algorithms of the air conditioner. Through continuous adjustment and improvement, the overall performance of the air conditioner can be enhanced, the service life of the equipment can be extended, and the market competitiveness of the product can be strengthened.

[0162] In summary, this method of obtaining the indoor environmental temperature by identifying the regions with different heat radiation differences has significant advantages in terms of temperature accuracy, comfort, energy conservation, adaptability, and optimization of air-conditioning performance. It is of great significance for improving the overall quality and user experience of variable-frequency air conditioners.

[0163] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling a variable frequency compressor of a variable frequency air conditioner, characterized in that: It comprises a variable frequency compressor (1), a copper tube (2), a four-way reversing valve (3), an outdoor condenser (4), an outdoor condensing fan (5), a throttling electronic expansion valve (6), an indoor evaporator (9) and an indoor evaporating fan (10); The variable frequency compressor (1) has a refrigerant output end and a refrigerant input end, and the refrigerant output end of the variable frequency compressor (1) is connected to a port of a four-way reversing valve (3) through the copper tube (2); The port of the four-way reversing valve (3) is connected to the outdoor condenser (4) through the copper tube (2), the outdoor condenser (4) is connected to one end of the throttling electronic expansion valve (6) through the copper tube (2), and the other end of the throttling electronic expansion valve (6) is connected to one end of the indoor evaporator (9) through the copper tube (2); The indoor evaporator (9) is connected to one port of the four-way reversing valve (3) through a copper tube (2), and the other port of the four-way reversing valve (3) is connected to the refrigerant input end of the variable frequency compressor (1) through the copper tube (2); The outdoor condensing fan (5) is arranged near the outdoor condenser (4); The indoor evaporation fan (10) is arranged near the indoor evaporator (9); An indoor environment temperature sensor is arranged near the indoor evaporation fan (10), and the indoor environment temperature sensor is used to obtain the indoor environment temperature Tao in real time; An outdoor ambient temperature sensor is arranged near the outdoor condenser (4), and the outdoor ambient temperature sensor is used to obtain the outdoor ambient temperature Tai in real time; The indoor environment temperature Tao or the outdoor environment temperature Tai is analyzed to determine the operating frequency range of the variable frequency compressor (1) and to control the operating frequency of the variable frequency compressor (1).

2. The variable frequency air conditioner variable frequency compressor control method according to claim 1, characterized in that: It also includes a liquid pipe stop valve (7) and a gas pipe stop valve (8), wherein the gas pipe stop valve (8) is arranged on the copper pipe (2) connecting the indoor evaporator (9) and the four-way reversing valve (3), and the liquid pipe stop valve (7) is arranged on the copper pipe (2) connecting the throttling electronic expansion valve (6) and the indoor evaporator (9).

3. The variable frequency air conditioner variable frequency compressor control method according to claim 2, characterized in that: Analyzing the indoor ambient temperature Tao or the outdoor ambient temperature Tai to determine the operating frequency range of the variable frequency compressor (1) and controlling the operating frequency of the variable frequency compressor (1) specifically comprises the following steps: Determine the operating frequency range of the variable frequency compressor (1) in the cooling or dehumidification condition according to the outdoor ambient temperature Tao; Controlling the operating frequency of the variable frequency compressor (1) in cooling or dehumidification conditions according to the indoor ambient temperature Tai; Determine the operating frequency range of the variable frequency compressor (1) in the heating condition according to the outdoor ambient temperature Tao; The operating frequency of the variable frequency compressor (1) is controlled in the heating state according to the indoor ambient temperature Tai.

4. The variable frequency air conditioner variable frequency compressor control method according to claim 3, characterized in that: The outdoor ambient temperature Tao determines the operating frequency range of the variable frequency compressor (1) in the cooling or dehumidification condition, which specifically includes the following steps: The outdoor ambient temperature Tao is compared with the preset first temperature threshold T0, second temperature threshold T2, third temperature threshold T3, fourth temperature threshold T4, fifth temperature threshold T5 and sixth temperature threshold T6: If the outdoor ambient temperature Tao ≥ the preset first temperature threshold T0, the maximum frequency limit of the compressor operation is the first frequency Q1, and the minimum frequency limit of the compressor operation is the fifth frequency Q5; If the preset second temperature threshold T2 ≤ outdoor ambient temperature Tao < the preset first temperature threshold T0, the maximum frequency limit of the compressor operation is determined by linear fitting according to the first formula, and the minimum frequency limit of the compressor operation is the fifth frequency Q5, where the first formula If the preset third temperature threshold T3 ≤ the outdoor ambient temperature Tao < the preset second temperature threshold T2, the maximum frequency limit of the compressor operation is the second frequency Q2, and the minimum frequency limit of the compressor operation is the fifth frequency Q6; If the preset fourth temperature threshold T4 ≤ outdoor ambient temperature Tao < the preset third temperature threshold T3, the maximum frequency limit of the compressor operation is determined by linear fitting according to the second formula, wherein the second formula The lowest frequency limit of the compressor operation is the fifth frequency Q6; If the preset fifth temperature threshold T5 ≤ outdoor ambient temperature Tao < the preset fourth temperature threshold T4, then the maximum frequency limit of the compressor operation is determined by linear fitting according to the third formula, where the second formula The lowest frequency limit of the compressor operation is the fifth frequency Q6; If the preset sixth temperature threshold T6 ≤ the outdoor ambient temperature Tao < the preset fifth temperature threshold T5, the maximum frequency limit of the compressor operation is the fourth frequency Q4, and the minimum frequency limit of the compressor operation is the fifth frequency Q6; The first frequency Q1 is greater than the second frequency Q2, the second frequency Q2 is greater than the third frequency Q3, the third frequency Q3 is greater than the fourth frequency Q4, the fourth frequency Q4 is greater than the fifth frequency Q5, and the fifth frequency Q5 is greater than the sixth frequency Q6.

5. The variable frequency air conditioner variable frequency compressor control method according to claim 3, characterized in that: According to the indoor environment temperature Tai, the operating frequency of the variable frequency compressor (1) is controlled in the cooling or dehumidification state, which specifically includes the following steps: The first temperature difference Δt1 is calculated according to the fourth formula Δt1=Tai-T1+E1 within the preset startup time, and the first temperature difference Δt1 is searched in the temperature difference-frequency table to obtain the operating frequency of the variable frequency compressor (1), wherein T1 is the set temperature in the cooling or dehumidification mode, and E1 is the temperature difference correction temperature in the cooling or dehumidification mode; After the preset startup time, the target frequency of the variable frequency compressor (1) during operation is calculated according to the variable frequency output stepless adjustment formula.

6. The variable frequency air conditioner variable frequency compressor control method according to claim 3, characterized in that: Determining the operating frequency range of the variable frequency compressor (1) in the heating condition according to the outdoor ambient temperature Tao specifically comprises the following steps: The outdoor environment temperature Tao is compared with the preset seventh temperature threshold T7, the eighth temperature threshold T8, the ninth temperature threshold T9, the tenth temperature threshold T 10 , Eleventh temperature threshold T 11 and the twelfth temperature threshold T 12 For comparison: If the outdoor ambient temperature Tao is less than the preset seventh temperature threshold T7, the maximum frequency of the compressor operation is limited to the seventh frequency Q7; If the preset seventh temperature threshold T7 ≤ outdoor ambient temperature Tao < the preset eighth temperature threshold T8, the maximum frequency limit of the compressor operation is determined by linear fitting according to the fifth formula, wherein the fifth formula If the preset eighth temperature threshold T8 ≤ the outdoor ambient temperature Tao < the preset ninth temperature threshold T9, the maximum frequency limit of the compressor operation is determined by linear fitting according to the sixth formula, wherein the sixth formula If the preset ninth temperature threshold T9 ≤ the outdoor ambient temperature Tao < the preset tenth temperature threshold T 10 , then the maximum frequency limit of the compressor operation is determined by linear fitting according to the seventh formula, where the seventh formula If the preset tenth temperature threshold T 10 ≤Outdoor ambient temperature Tao<preset eleventh temperature threshold T 11 , then the maximum frequency limit of the compressor operation is determined by linear fitting according to the eighth formula, where the eighth formula If the preset eleventh temperature threshold T 11 ≤Outdoor ambient temperature Tao<preset twelfth temperature threshold T 12 , then the maximum frequency limit of the compressor is the eleventh frequency Q 11 ; The seventh frequency Q7 is greater than the eighth frequency Q8, the eighth frequency Q8 is greater than the ninth frequency Q9, and the ninth frequency Q9 is greater than the tenth frequency Q 10 , the tenth frequency Q 10 Greater than the eleventh frequency Q 11 .

7. The variable frequency air conditioner variable frequency compressor control method according to claim 5, characterized in that: According to the indoor ambient temperature Tai, the operating frequency of the variable frequency compressor (1) is controlled in the heating state, which specifically includes the following steps: The second temperature difference Δt2 is calculated according to the ninth formula Δt2=T1′-Tai+E2 within the preset startup time, and the second temperature difference Δt2 is searched in the temperature difference-frequency table to obtain the operating frequency of the variable frequency compressor (1); wherein T1′ is the indoor set temperature in the heating mode, and E2 is the heating temperature correction temperature; After the preset startup time, the target frequency of the variable frequency compressor (1) during operation is calculated according to the variable frequency output stepless adjustment formula.

8. The variable frequency air conditioner variable frequency compressor control method according to claim 7, characterized in that: After the preset startup time, the target frequency of the variable frequency compressor (1) during operation is calculated according to the variable frequency output stepless adjustment formula, specifically: According to the variable frequency output stepless adjustment formula F n =F n-1 +K1×ΔT n +K2×(ΔT n -ΔT n-1 ) to obtain the target frequency F of the variable frequency compressor (1) when it is running n ; Among them, F n-1 Indicates the current frequency, ΔT n is the difference between the current temperature and the indoor ambient temperature Tai, ΔT n-1 It indicates the difference between the last temperature and the indoor ambient temperature. K1 and K2 indicate the influence weights.

9. The variable frequency air conditioner variable frequency compressor control method according to claim 8, characterized in that: The indoor environment temperature sensor is used to obtain the indoor environment temperature Tao in real time, and specifically includes the following steps: Identify the thermal radiation difference areas in the indoor environment, obtain the initial temperature information and area information of each thermal radiation difference area in the indoor environment, and take and mark the initial temperature information of each thermal radiation difference area to obtain the initial temperature value T 初P , the area information of each thermal radiation difference area in the indoor environment is taken and marked to obtain the area value M P , where p represents the number of each thermal radiation difference area, and the value of p is a positive integer; Temperature calculation formula The indoor ambient temperature Tao is calculated, where m represents the total number of thermal radiation difference areas.

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