Control method of air conditioner and air conditioner

Abstract

The invention relates to the technical field of air conditioners, particularly provides a control method of an air conditioner and the air conditioner, and aims to solve the problem that a compressor is easy to stop or break down due to oil return at a fixed frequency under a severe working condition of an existing air conditioner. In order to achieve the purpose, the control method of the air conditioner comprises the steps that the outdoor environment temperature T < outside >, the indoor environment temperature T < inside > and the compressor oil dilution rate Y are obtained; obtaining the initial frequency of the compressor according to the T < outside >; and an initial frequency increasing value T1 is obtained according to the T < inner > and the Y, the increasing value T1 is used as the initial oil return frequency on the basis of the initial frequency, and the compressor operates for a preset duration at the initial oil return frequency. The initial oil return frequency is determined according to the indoor environment, the outdoor environment and the oil dilution rate of the compressor, and therefore it is guaranteed that the oil return frequency of the compressor can be adjusted according to the actual situation even if the compressor is under the severe refrigerating or heating working condition, and faults caused by the too high exhaust temperature of the compressor are avoided.

Description

Technical Field

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

[0002] During the operation of the air-conditioning compressor, a fixed oil return frequency is generally used for oil return. After a period of oil return, the frequency is gradually increased to the required operating frequency. However, when the compressor is in a relatively harsh refrigeration condition, the oil return effect is not good after using a fixed frequency oil return. Then, high-frequency operation is likely to cause the compressor's exhaust temperature to be too high, causing the compressor to reduce frequency or shut down. Under harsh heating conditions, due to the low temperature of the refrigeration oil, the excessively high compressor frequency is likely to cause the oil to spray out of the compressor quickly, resulting in too little oil in the compressor and damage.

[0003] Accordingly, a new air conditioner control method is needed in the art to solve the problem that the existing air conditioner easily causes the compressor to shut down or malfunction due to oil return at a fixed frequency under severe working conditions. Summary of the invention

[0004] The present invention aims to solve the above technical problem, that is, to solve the problem that the oil return at a fixed frequency in the existing air conditioner under severe working conditions easily causes the compressor to shut down or fail.

[0005] In a first aspect, the present invention provides a method for controlling an air conditioner, the method comprising:

[0006] Get the outdoor ambient temperature T 外 , Indoor ambient temperature T 内 and compressor oil dilution rate Y;

[0007] According to T 外 Get the initial frequency of the compressor;

[0008] According to T 内 , Y obtains the initial frequency increase value △T1;

[0009] On the basis of the initial frequency, ΔT1 is gradually increased as the initial oil return frequency, and the compressor maintains the operation at the initial oil return frequency for a preset time period.

[0010] In the case of adopting the above technical solution, the initial oil return frequency is determined according to the indoor ambient temperature and the outdoor ambient temperature in combination with the compressor oil dilution rate, thereby ensuring that the compressor can adjust the oil return frequency according to the actual situation even under severe cooling or heating conditions, thereby avoiding failures caused by excessively high compressor exhaust temperature after oil return. The oil return frequency of the present invention is determined according to the actual outdoor ambient temperature, the indoor ambient temperature and the compressor oil dilution rate, so compared with a fixed oil return frequency, it can better adapt to severe conditions, ensure the oil return effect, and improve the reliability of the air conditioner.

[0011] In the optional technical solution of the above-mentioned air conditioner control method, "according to T 内 , the step of obtaining the initial frequency increase value △T1" further includes:

[0012] When the air conditioner is cooling, △T1=T 内 -(Y-20%)*100;

[0013] When the air conditioner is heating, △T1=T 内 +(Y-20%)*100; where Y is the press oil dilution ratio.

[0014] When the above technical solution is adopted, the oil return frequency increase value can be accurately determined according to the formula in cooling and heating, respectively in combination with the indoor ambient temperature and the compressor oil dilution rate.

[0015] In the optional technical solution of the control method of the air conditioner, after the step of "gradually increasing ΔT1 as the initial oil return frequency based on the initial frequency, and the compressor maintains the operation of the initial oil return frequency for a preset time", the control method further includes:

[0016] Get the compressor exhaust temperature T 排 ;

[0017] According to T 排 The frequency is selectively increased based on the initial frequency as the operating oil return frequency, and the compressor maintains the operating oil return frequency for a set period of time.

[0018] When the above technical solution is adopted, the exhaust temperature will have a certain impact on the operation of the compressor, so adjusting the compressor oil return frequency according to the exhaust temperature can further prevent the compressor exhaust temperature from being too high.

[0019] In the optional technical solution of the above-mentioned air conditioner control method, "according to T 排 The step of selectively increasing the frequency based on the initial frequency as the operating oil return frequency, and the compressor maintaining the operating oil return frequency for a set period of time further includes:

[0020] Air conditioner cooling operation;

[0021] T 排 ≥ the first refrigeration exhaust temperature, the compressor maintains the initial oil return frequency and continues to run for the set time;

[0022] T 排 When the first refrigeration exhaust temperature is reached, the frequency is increased based on the initial frequency to serve as the operating oil return frequency, and the compressor maintains the operating oil return frequency for a set period of time.

[0023] In the case of adopting the above technical solution, when the exhaust temperature is high, in order to avoid compressor failure caused by excessive exhaust temperature, the compressor does not increase the frequency and continues to operate at the initial oil return frequency. When the exhaust temperature is low, the compressor increases the frequency to ensure operating efficiency.

[0024] In the optional technical solution of the control method of the air conditioner, the step of "increasing the frequency based on the initial frequency as the operating oil return frequency" further includes:

[0025] Get the inner coil temperature T 盘 ;

[0026] According to T 盘 Calculate the increase of the operating frequency by △T2 and Y, △T2 = T 盘 -(Y-20%)*100;

[0027] The operating oil return frequency is determined by increasing ΔT2 on the basis of the initial oil return frequency.

[0028] When the above technical solution is adopted, the temperature of the inner coil of the air conditioner will drop during the cooling operation. Considering the influence of the inner coil temperature on the operation of the air conditioner, after running at the initial oil return frequency for a period of time, the oil return frequency is adjusted according to the inner coil temperature combined with the compressor oil dilution rate.

[0029] In the optional technical solution of the above-mentioned air conditioner control method, "T 排 The step of "at the first refrigeration exhaust temperature, increasing the frequency based on the initial frequency as the operating oil return frequency, and the compressor maintaining the operating oil return frequency for a set period of time" further includes:

[0030] The second preset cooling temperature ≤T 排 <When the first preset refrigeration temperature is reached, the compressor maintains the oil return frequency and continues to operate for a second preset time period;

[0031] T 排 When the temperature is lower than the second preset refrigeration temperature, the compressor maintains the oil return frequency and continues to operate for a third preset time period; wherein the second preset time period is lower than the third preset time period.

[0032] When the above technical solution is adopted, during refrigeration, the oil return time is adjusted according to the exhaust temperature, so as to ensure that the exhaust temperature is within a reasonable range while ensuring the oil return effect.

[0033] In the optional technical solution of the above-mentioned air conditioner control method, "according to T 排 The step of selectively increasing the frequency based on the initial frequency as the operating oil return frequency, and the compressor maintaining the operating oil return frequency for a set period of time further includes:

[0034] The air conditioner is in heating mode;

[0035] T 排 ≥ the first heating exhaust temperature, the compressor maintains the initial oil return frequency and continues to run for a set time;

[0036] T 排 When the first heating exhaust gas temperature is lower than the first heating exhaust gas temperature, the frequency is increased on the basis of the initial frequency as the operating oil return frequency, and the compressor maintains the operating oil return frequency for a set period of time.

[0037] When the above technical solution is adopted, T 排 ≥ the first heating exhaust temperature, indicating that the air conditioner exhaust temperature is high. To avoid compressor failure caused by excessively high exhaust temperature, the compressor does not increase the frequency and maintains the initial oil return frequency. 排 When the first heating exhaust temperature is lower than the first heating exhaust temperature, it means that the air conditioner exhaust temperature is low and the compressor increases the frequency and returns oil.

[0038] In the optional technical solution of the control method of the air conditioner, the step of "increasing the frequency based on the initial frequency as the operating oil return frequency" further includes:

[0039] Get the inner coil temperature T 盘 ;

[0040] According to T 盘 , T 内 and Y to calculate the increase in operating frequency △T2; △T2 = T 盘 -T 内 -(Y-20%)*100;

[0041] The operating oil return frequency is determined by increasing ΔT2 on the basis of the initial oil return frequency.

[0042] When the above technical solution is adopted, during heating operation, the air conditioner inner coil temperature and indoor temperature will both rise. Taking into account the impact of the inner coil temperature and indoor temperature on the air conditioner operation, the increase in the operating oil return frequency is calculated based on the inner coil temperature, indoor temperature and compressor oil dilution rate.

[0043] In the optional technical solution of the above-mentioned air conditioner control method, "T 排 The step of "at the first heating exhaust temperature, increasing the frequency based on the initial frequency as the operating oil return frequency, and the compressor maintaining the operating oil return frequency for a set period of time" further includes:

[0044] Second heating exhaust temperature ≤T 排 When the first heating exhaust gas temperature is less than, the compressor maintains the oil return frequency and continues to operate for the seventh preset time period;

[0045] T排 When the temperature of the exhaust gas for heating is lower than the second heating exhaust temperature, the compressor maintains the oil return frequency and continues to operate for an eighth preset time period; wherein the seventh preset time period is lower than the eighth preset time period.

[0046] When the above technical solution is adopted, during heating, the oil return time is adjusted according to the exhaust temperature, so as to ensure that the exhaust temperature is within a reasonable range while ensuring the oil return effect.

[0047] The present invention also provides an air conditioner, comprising a memory, a processor, and an air conditioning control program stored in the memory and executable on the processor, wherein the air conditioning control program is executed by the processor to implement the air conditioner control method described in any one of the above technical solutions.

[0048] It is understood by those skilled in the art that the air conditioner control method of the present invention includes obtaining the outdoor environment temperature T 外 , Indoor ambient temperature T 内 and compressor oil dilution rate Y; according to T 外 Get the initial frequency of the compressor; according to T 内 The initial frequency increase value △T1 is obtained by using Y; the initial frequency is increased by △T1 as the initial oil return frequency, and the compressor maintains the initial oil return frequency for a preset time.

[0049] In the case of adopting the above technical solution, the present invention determines the initial oil return frequency according to the indoor environment and the outdoor environment in combination with the compressor oil dilution rate, thereby ensuring that the compressor can adjust the oil return frequency according to the actual situation even under severe cooling or heating conditions to ensure the oil return effect, thereby avoiding failures caused by excessively high compressor exhaust temperature. Since the oil return frequency of the present invention is determined based on the actual outdoor ambient temperature, indoor ambient temperature and compressor oil dilution rate, it can better adapt to severe conditions, ensure the oil return effect, and improve the reliability of the air conditioner compared to a fixed oil return frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0051] Figure 1 is a flow chart of the main steps of the control method of the air conditioner of the present invention;

[0052] Figure 2 The steps of one embodiment of the air conditioner control method of the present invention are as follows:

[0053] Figure 3 This is a step fluid of another embodiment of the air conditioner control method of the present invention. DETAILED DESCRIPTION

[0054] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0055] Specifically, the air conditioner of the present invention comprises an indoor unit, an outdoor unit and a refrigerant circulation loop arranged between the indoor unit and the outdoor unit. The indoor unit comprises an indoor coil and an indoor fan, and the outdoor unit comprises an outdoor coil, an outdoor fan and a variable frequency compressor.

[0056] The indoor coil, outdoor coil and variable frequency compressor are all set on the refrigerant circulation loop. The refrigerant circulates between indoor and outdoor through the refrigerant circulation loop to exchange heat with the indoor environment through the indoor unit, thereby meeting the user's heat exchange needs. The indoor fan is used to blow air into the room, and the outdoor fan is used to dissipate heat from the outdoor unit and speed up air flow. During use, the user can control the operation of the air conditioner by setting the temperature.

[0057] Those skilled in the art will appreciate that the present invention does not impose any limitation on the specific structure of the air conditioner, and the technicians can set the specific structure of the air conditioner according to actual usage requirements. Such changes in specific application objects do not deviate from the basic principles of the present invention and fall within the scope of protection of the present invention.

[0058] Furthermore, the air conditioner also includes an outdoor temperature sensor, an indoor coil temperature sensor, an exhaust temperature sensor and a controller. The outdoor temperature sensor can detect the ambient temperature of the outdoor unit, and the indoor coil sensor can detect the temperature of the indoor coil, and there is no restriction on the detection position, which can be set by those skilled in the art as needed. The exhaust temperature sensor is used to detect the exhaust temperature of the compressor, and the present invention does not impose any restriction on its detection position.

[0059] The controller can obtain the outdoor ambient temperature, the indoor ambient temperature, the indoor coil temperature and the exhaust temperature, and the controller can also control the operating state of the air conditioner. For example, the frequency of the variable frequency compressor, etc. It can be understood by those skilled in the art that the present invention does not impose any restrictions on the specific structure and model of the controller, and the technicians can set the structure and model of the controller according to actual use requirements.

[0060] like Figure 1 As shown, the main steps of the air conditioner control method of the present invention include:

[0061] Step S10: Obtaining the outdoor ambient temperature T 外 , Indoor ambient temperature T 内 and compressor oil dilution rate Y;

[0062] Step S20: According to T 外 Get the initial frequency of the compressor;

[0063] Step S30: According to T 内 and Y to obtain the initial frequency increase value △T1;

[0064] Step S40: increasing the initial frequency by ΔT1 as the initial oil return frequency, and the compressor maintains the initial oil return frequency for a preset time.

[0065] The advantage of the above arrangement is that the initial oil return frequency is determined according to the indoor environment and the outdoor environment in combination with the compressor oil dilution rate, thereby ensuring that the compressor can adjust the oil return frequency according to the actual situation even under severe cooling or heating conditions to ensure the oil return effect, thereby avoiding failures caused by excessively high compressor exhaust temperature. The oil return frequency of the present invention is determined according to the actual outdoor ambient temperature, the indoor ambient temperature and the compressor oil dilution rate, so compared with a fixed oil return frequency, it can better adapt to severe conditions, ensure the oil return effect, and improve the reliability of the air conditioner.

[0066] The oil and refrigerant volume of the compressor can be set before the air conditioner leaves the factory, and then locked and written into the computer board. The computer board automatically calculates the oil dilution rate, and the calculation formula is: Oil dilution rate Y = If the oil dilution rate is too small, the compressor will be damaged. If the oil dilution rate is too large, the energy efficiency will be affected. Therefore, 20% can be used as a benchmark for calculation. However, the oil dilution rate Y can be set by those skilled in the art according to actual conditions. The present invention does not impose any restrictions on the specific value and acquisition method of the oil dilution rate Y, and all of them fall within the scope of protection of the present invention.

[0067] like Figure 2 As shown, in a possible implementation manner, the specific steps of the air conditioner control method include:

[0068] Step S11: the air conditioner is in cooling operation;

[0069] Step S12: Obtaining the outdoor ambient temperature T 外 , Indoor ambient temperature T 内 and compressor oil dilution rate Y;

[0070] Step S13: obtaining the highest initial frequency;

[0071] Step S21: According to T 外 Get the initial frequency and frequency adjustment speed of the compressor.

[0072] Step S21 further includes:

[0073] Step: T 外≥ the first refrigeration outer ring temperature, the initial frequency of the compressor is the first frequency value, and the frequency adjustment speed is the first speed value;

[0074] Step: The second refrigeration outer ring temperature ≤ T 外 When the temperature of the first refrigeration outer ring is less than the first refrigeration outer ring temperature, the initial frequency of the compressor is the second frequency value, and the frequency adjustment speed is the second speed value;

[0075] Step: T 外 When the temperature of the second refrigeration outer ring is less than the second refrigeration outer ring temperature, the initial frequency of the compressor is the third frequency value, and the frequency adjustment speed is the third speed value.

[0076] For example, the first refrigeration outer ring temperature is set to 40°C, the second refrigeration outer ring temperature is set to 30°C, the first frequency value is set to 30HZ, the second frequency value is set to 35HZ, the third frequency value is set to 40HZ, the first speed value is 0.6HZ / second, the second speed value is 1HZ / second, and the third speed value is 1HZ / second. 外 When it is ≥40℃, it means that the indoor temperature is high and the working condition is not good, so the compressor increases the frequency at a lower speed and starts running at a lower initial frequency. 外 <30℃, which means the indoor temperature is low and the working condition is good, so the compressor increases the frequency at a higher speed and starts running at a higher initial frequency.

[0077] Step S31: According to T 内 Calculate the initial frequency increase value △T1 with Y; △T1=Tinner-(Y-20%)*100;

[0078] Step S41: Based on the initial frequency, the speed is increased by ΔT1 with the corresponding frequency adjustment as the initial oil return frequency.

[0079] After the initial frequency is obtained according to the outdoor ambient temperature, the initial frequency is adjusted at the corresponding frequency adjustment speed, so that the frequency is increased at a slower speed when the working condition is poor, and at a faster speed when the working condition is good, to prevent the compressor from being damaged by oil return. However, the present invention does not impose any restrictions on the specific values ​​of the first speed value to the third speed value, and they all fall within the protection scope of the present invention.

[0080] After the initial oil return frequency is obtained, step S42 is executed.

[0081] Step S42: Determine whether the initial oil return frequency < the maximum initial oil return frequency is established.

[0082] If step S42 is established, then step S421 is executed; if step S41 is not established, then step S422 is executed.

[0083] Step S421: The compressor maintains the initial oil return frequency and operates for a first preset time period;

[0084] Step S422: The compressor maintains the highest initial oil return frequency for a first preset time period.

[0085] For example, the maximum initial oil return frequency is set to 58HZ. When the compressor is stopped, the compressor oil is distributed in the refrigerant pipeline. The compressor frequency cannot be too high when the oil return starts, otherwise it will have a certain impact on the compressor. Therefore, when the initial oil return frequency is calculated to be greater than the maximum initial oil return frequency, it is operated at the maximum initial oil return frequency.

[0086] Further, after the compressor runs at the initial oil return frequency or the highest initial oil return frequency for a first preset time, for example, the first preset time is set to 3 minutes, the oil return frequency is adjusted by detecting the exhaust temperature, so that the influence of the exhaust temperature on the oil return is considered on the basis of the outdoor temperature, the indoor temperature and the oil dilution rate, and the oil return is continued, so as to further improve the oil return effect and prevent the compressor from being damaged or shut down.

[0087] The specific steps are as follows:

[0088] Step S51: Obtaining the exhaust gas temperature T 排 And get the inner coil temperature T 盘 ;

[0089] Step S52: According to T 盘 and Y to calculate the increase in operating frequency △T2; △T2 = T 盘 -(Y-20%)*100;

[0090] Step S53: According to T 排 The operating oil return frequency is selectively increased by △T2 based on the initial oil return frequency, and the compressor maintains the operating oil return frequency for the set time.

[0091] The exhaust temperature will have a certain impact on the operation of the compressor, so adjusting the compressor oil return frequency according to the exhaust temperature can prevent the compressor exhaust temperature from being too high. During cooling operation, the air conditioner internal coil temperature will drop. Considering the impact of the internal coil temperature on the operation of the air conditioner, the frequency increase value is calculated based on the internal coil temperature and the compressor oil dilution rate.

[0092] Step S53 further includes:

[0093] Step: T 排 ≥ the first refrigeration exhaust temperature, the compressor maintains the initial oil return frequency or the highest initial oil return frequency and continues to run for the second preset time;

[0094] Step: Second refrigeration exhaust temperature ≤ T 排 When the first refrigeration exhaust temperature is reached, the compressor maintains the oil return frequency and continues to run for the third preset time;

[0095] Step: T 排 When the second refrigeration exhaust temperature is lower than the second refrigeration exhaust temperature, the compressor maintains the oil return frequency and continues to run for the fourth preset time period.

[0096] Among them, the second preset time length is less than the third preset time length and less than the fourth preset time length.

[0097] For example, the first refrigeration exhaust temperature is set to 80° C., the second refrigeration exhaust temperature is set to 60° C., the second preset time length is 1 minute, the third preset time length is 2 minutes, and the fourth preset time length is 3 minutes.

[0098] T 排 When ≥80℃, it indicates that the exhaust temperature is high. To avoid compressor failure caused by excessive exhaust temperature, the compressor will not increase the frequency, but continue to operate at the initial oil return frequency or the highest initial oil return frequency, and shorten the oil return time to 1 minute.

[0099] T 排 <60℃, it means the exhaust temperature is low, the compressor frequency is increased, the oil return duration can be extended, the oil return time is 3 minutes. 60℃≤T 排 When the temperature is less than 80℃, the compressor will increase the frequency and the oil return time will be 2 minutes.

[0100] The oil return time is adjusted according to the exhaust temperature to ensure that the exhaust temperature is within a reasonable range while ensuring the oil return effect.

[0101] In another embodiment, the air conditioner operates with oil return for heating, and the principle is the same as that of the air conditioner operating with oil return for cooling.

[0102] like Figure 3 As shown, the specific steps of another implementation of the air conditioner control method include:

[0103] Step S14: the air conditioner operates in heating mode;

[0104] Step S15: Obtaining the outdoor ambient temperature T 外 , Indoor ambient temperature T 内 and compressor oil dilution rate Y;

[0105] Step S16: obtaining the highest initial frequency;

[0106] Step S22: According to T 外 Get the initial frequency and frequency adjustment speed of the compressor.

[0107] Step S22 further includes:

[0108] Step: T 外 ≥ the first heating outer ring temperature, the initial frequency of the compressor is the fourth frequency value, and the frequency adjustment speed is the fourth speed value;

[0109] Step: The second heating outer ring temperature ≤ T 外 When the temperature of the first heating outer ring is lower than that of the first heating outer ring, the initial frequency of the compressor is the fifth frequency value, and the frequency adjustment speed is the fifth speed value;

[0110] Step: T 外 When the temperature of the second heating outer ring is less than the second heating outer ring temperature, the initial frequency of the compressor is the sixth frequency value, and the frequency adjustment speed is the sixth speed value.

[0111] For example, the first heating outer loop temperature is set to 10°C, the second heating outer loop temperature is set to -3°C, the fourth frequency value is set to 30HZ, the fifth frequency value is set to 25HZ, and the sixth frequency value is set to 20HZ. 外 When ≥10℃, it means the indoor temperature is high and the working condition is good, so the frequency is increased at a higher speed and runs at a higher initial frequency. 外 <-3℃, which means the indoor temperature is low and the working condition is not good, so the frequency is increased at a lower speed and it runs at a lower initial frequency.

[0112] Step S32: According to T 内 and Y to calculate the initial frequency increase △T1; △T1 = T 内 +(Y-20%)*100;

[0113] Step S43: Based on the initial frequency, the speed is increased by ΔT1 with the corresponding frequency adjustment as the initial oil return frequency.

[0114] After obtaining the initial frequency, the initial frequency is adjusted at the corresponding frequency adjustment speed, so that the frequency is increased at a slower speed when the working condition is poor, and at a faster speed when the working condition is good, to prevent the compressor from oil return damage. For example, the fourth speed value and the fifth speed value are 1HZ / second, and the sixth speed value is 0.6HZ / second.

[0115] Step S44: Determine whether the initial oil return frequency < the maximum initial oil return frequency is established.

[0116] If step S44 is established, then execute step S441, if step S44 is not established, then execute step S442.

[0117] Step S441: The compressor maintains the initial oil return frequency and operates for a fifth preset time period;

[0118] Step S442: The compressor maintains the highest initial oil return frequency for a fifth preset time period.

[0119] For example, the highest initial oil return frequency is set to 58 Hz. Further, after the compressor runs at the initial oil return frequency or the highest initial oil return frequency for a fifth preset time, for example, the fifth preset time is set to 10 minutes. The oil return frequency is adjusted by detecting the exhaust temperature, so that the oil return is continued in consideration of the influence of the exhaust temperature on the oil return.

[0120] The specific steps are as follows:

[0121] Step S54: Obtaining the exhaust temperature T 排 , Indoor temperature T 内 and the inner coil temperature T 盘 ;

[0122] Step S55: According to T 盘 , T 内 and Y to calculate the increase in operating frequency △T2; △T2 = T 盘 -T 内 -(Y-20%)*100;

[0123] Step S56: According to T 排 The operating oil return frequency is selectively increased by △T2 based on the initial oil return frequency, and the compressor maintains the operating oil return frequency for the set time.

[0124] During heating operation, both the air conditioner inner coil temperature and the indoor temperature will rise. Considering the impact of the inner coil temperature and the indoor temperature on the air conditioner operation, the frequency increase value is calculated based on the inner coil temperature, the indoor temperature and the compressor oil dilution rate.

[0125] Step S56 further comprises:

[0126] Step: T 排 ≥ the first heating exhaust temperature, the compressor maintains the initial oil return frequency or the highest initial oil return frequency and continues to operate for the sixth preset time;

[0127] Step: Second heating exhaust temperature ≤ T 排 When the first heating exhaust temperature is less than the first heating exhaust temperature, the compressor maintains the oil return frequency and continues to run for the seventh preset time;

[0128] Step: T 排 When the temperature of the exhaust gas for heating is lower than the second heating exhaust temperature, the compressor maintains the oil return frequency and continues to operate for the eighth preset time. Among them, the sixth preset time is lower than the seventh preset time and lower than the eighth preset time.

[0129] For example, the first heating exhaust temperature is set to 70° C., the second heating exhaust temperature is set to 50° C., the sixth preset time is 5 minutes, the seventh preset time is 8 minutes, and the eighth preset time is 10 minutes.

[0130] T 排When ≥70℃, it means that the exhaust temperature of the air conditioner is high. To avoid compressor failure caused by excessively high exhaust temperature, the compressor will not increase the frequency, but maintain the initial oil return frequency or the highest initial oil return frequency, and shorten the oil return time to 5 minutes.

[0131] T 排 <50℃, it means the air conditioner exhaust temperature is low, the compressor frequency is increased, and the oil return duration can be extended to 10 minutes.

[0132] 50℃≤T 排 When the temperature is less than 70℃, the compressor will increase the frequency and the oil return time will be 8 minutes.

[0133] The above-mentioned operating oil return frequency can be adjusted once at regular intervals, for example, once every 20 seconds, so as to improve the accuracy of the adjustment.

[0134] In summary, the control method of the air conditioner of the present invention can comprehensively consider the influence of outdoor temperature, indoor temperature, oil dilution rate, exhaust temperature and internal coil temperature on the operation of the air conditioner to adjust the oil return frequency, ensure the oil return effect, avoid compressor damage and improve the reliability of the compressor.

[0135] After the compressor oil return is completed, it switches to normal operating frequency and records the operating status and startup interval time for adjusting the next oil return cycle.

[0136] However, it should be noted that in step S53 and step S56, 排 The operating oil return frequency is selectively increased by ΔT2 based on the initial oil return frequency, wherein ΔT2 does not have to be calculated using the formula of the present invention. Those skilled in the art can set the specific value of ΔT2 according to actual needs, and all of them fall within the protection scope of the present invention.

[0137] In addition, the specific numerical values ​​in the above-mentioned embodiments are not intended to limit the protection scope of the present invention. For example, the maximum initial oil return frequency, the first preset time, the second preset time, etc., those skilled in the art can set the above-mentioned specific numerical values ​​according to actual needs, and they all fall within the protection scope of the present invention.

[0138] As stated in the first paragraph of this section, the above implementation mode is only used to illustrate the principles of the present invention and is not intended to limit the scope of protection of the present invention. Without departing from the principles of the present invention, those skilled in the art can adjust the above structure so that the present invention can be applied to more specific application scenarios.

[0139] In addition, the present invention also provides an air conditioner, which includes a memory, a processor, and an air conditioning control program stored in the memory and executable on the processor. The air conditioning control program is executed by the processor to implement the air conditioner control method described in any of the above embodiments.

[0140] Those skilled in the art can understand that the above-mentioned air conditioner also includes some other well-known structures, the memory includes but is not limited to random access memory, flash memory, read-only memory, programmable read-only memory, volatile memory, non-volatile memory, serial memory, parallel memory or register, etc., and the processor includes but is not limited to CPLD / FPGA, DSP, ARM processor, MIPS processor, etc. In order to unnecessarily obscure the embodiments of the present disclosure, these well-known structures are not shown in the drawings.

[0141] Although the various steps in the above embodiment are described in the above order, those skilled in the art can understand that in order to achieve the effect of this embodiment, different steps do not have to be executed in such an order, and they can be executed simultaneously (in parallel) or in a reverse order. For example, step S12 and step S13 can be executed simultaneously, or step S12 can be executed first and then step S13. Those skilled in the art can set the order of the steps as needed, and all of them fall within the protection scope of the present invention.

[0142] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A method for controlling an air conditioner, characterized in that: The control method comprises: Get the outdoor ambient temperature T 外 , Indoor ambient temperature T 内 and compressor oil dilution rate Y; According to T 外 Get the initial frequency of the compressor; According to T 内 , Y obtains the initial frequency increase value △T1; On the basis of the initial frequency, ΔT1 is gradually increased as the initial oil return frequency, and the compressor maintains the operation at the initial oil return frequency for a preset time period.

2. The air conditioner control method according to claim 1, characterized in that: "According to T 内 , the step of obtaining the initial frequency increase value △T1" further includes: When the air conditioner is cooling, △T1=T 内 -(Y-20%)*100; When the air conditioner is heating, △T1=T 内 +(Y-20%)*100; where Y is the press oil dilution ratio.

3. The air conditioner control method according to claim 2, characterized in that: After the step of "gradually increasing ΔT1 as the initial oil return frequency based on the initial frequency, and the compressor maintains the operation of the initial oil return frequency for a preset time", the control method further includes: Get the compressor exhaust temperature T 排 ; According to T 排 The frequency is selectively increased based on the initial frequency as the operating oil return frequency, and the compressor maintains the operating oil return frequency for a set period of time.

4. The control method of the air conditioner according to claim 3, characterized in that: "According to T 排 The step of selectively increasing the frequency based on the initial frequency as the operating oil return frequency, and the compressor maintaining the operating oil return frequency for a set period of time further includes: Air conditioner cooling operation; T 排 ≥ the first refrigeration exhaust temperature, the compressor maintains the initial oil return frequency and continues to run for the set time; T 排 When the first refrigeration exhaust temperature is reached, the frequency is increased based on the initial frequency to serve as the operating oil return frequency, and the compressor maintains the operating oil return frequency for a set period of time.

5. The air conditioner control method according to claim 4, characterized in that: The step of "raising the frequency based on the initial frequency as the operating oil return frequency" further includes: Get the inner coil temperature T 盘 ; According to T 盘 Calculate the increase of the operating frequency by △T2 and Y, △T2 = T 盘 -(Y-20%)*100; The operating oil return frequency is determined by increasing ΔT2 on the basis of the initial oil return frequency.

6. The air conditioner control method according to claim 4, characterized in that: "T 排 The step of "at the first refrigeration exhaust temperature, increasing the frequency based on the initial frequency as the operating oil return frequency, and the compressor maintaining the operating oil return frequency for a set period of time" further includes: The second preset cooling temperature ≤T 排 <When the first preset refrigeration temperature is reached, the compressor maintains the oil return frequency and continues to operate for a second preset time period; T 排 When the temperature is lower than the second preset refrigeration temperature, the compressor maintains the oil return frequency and continues to operate for a third preset time period; wherein the second preset time period is lower than the third preset time period.

7. The air conditioner control method according to claim 3, characterized in that: "According to T 排 The step of selectively increasing the frequency based on the initial frequency as the operating oil return frequency, and the compressor maintaining the operating oil return frequency for a set period of time further includes: The air conditioner is in heating mode; T 排 ≥ the first heating exhaust temperature, the compressor maintains the initial oil return frequency and continues to run for a set time; T 排 When the first heating exhaust gas temperature is lower than the first heating exhaust gas temperature, the frequency is increased on the basis of the initial frequency as the operating oil return frequency, and the compressor maintains the operating oil return frequency for a set period of time.

8. The control method of the air conditioner according to claim 7, characterized in that: The step of "raising the frequency based on the initial frequency as the operating oil return frequency" further includes: Get the inner coil temperature T 盘 ; According to T 盘 , T 内 and Y to calculate the increase in operating frequency △T2; △T2 = T 盘 -T 内 -(Y-20%)*100; The operating oil return frequency is determined by increasing ΔT2 on the basis of the initial oil return frequency.

9. The air conditioner control method according to claim 7, characterized in that: "T 排 The step of "at the first heating exhaust temperature, increasing the frequency based on the initial frequency as the operating oil return frequency, and the compressor maintaining the operating oil return frequency for a set period of time" further includes: Second heating exhaust temperature ≤T 排 When the first heating exhaust gas temperature is less than, the compressor maintains the oil return frequency and continues to operate for the seventh preset time period; T 排 When the temperature of the exhaust gas for heating is lower than the second heating exhaust temperature, the compressor maintains the oil return frequency and continues to operate for an eighth preset time period; wherein the seventh preset time period is lower than the eighth preset time period.

10. An air conditioner, characterized in that: The air conditioner includes a memory, a processor, and an air conditioning control program stored in the memory and executable on the processor, wherein the air conditioning control program is executed by the processor to implement the air conditioner control method according to any one of claims 1 to 9.

Images