Control method of air conditioner and air conditioner

Abstract

The invention relates to the technical field of air conditioners, particularly provides an air conditioner control method and an air conditioner, and aims to solve the problem of noise caused by frequent start and stop of an existing air conditioner. In order to achieve the purpose, the control method of the air conditioner comprises the steps that the indoor environment temperature T < inner > is obtained; the difference value between the temperature T and the set temperature T is calculated; and before T reaches T, gradually reducing the frequency of the compressor and the rotating speed of the outdoor fan according to the change of T1 until the frequency of the compressor is reduced to the lowest set frequency and the rotating speed of the outdoor fan is reduced to the lowest set rotating speed of the outdoor fan. Whether the air conditioner is used for refrigerating or heating, before the indoor environment temperature T reaches the set temperature T, the frequency of the compressor and the rotating speed of the outdoor fan are gradually reduced according to the difference value change between the T and the T. Before the air conditioner reaches the temperature, the running state of the air conditioner is intervened in advance, stable change of the indoor temperature can be kept, rapid temperature reaching shutdown and frequent starting and stopping are avoided, and then noise is reduced.

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] Many existing air conditioners use the temperature-sensitive shutdown control method. In theory, the temperature-sensitive shutdown method can reduce power consumption. However, when the indoor temperature reaches the set temperature, the fan stops and the indoor air circulation stops, which can easily cause a rapid temperature rebound. This will cause frequent starting and stopping of the compressor, resulting in loud noise and poor user experience.

[0003] Accordingly, the art needs a new air conditioner control method to solve the noise problem caused by the frequent start and stop of the existing air conditioner. Summary of the invention

[0004] The present invention aims to solve the above technical problem, that is, to solve the noise problem caused by frequent starting and stopping of the existing air conditioner.

[0005] In a first aspect, the present invention provides a method for controlling an air conditioner, the method for controlling an air conditioner comprising obtaining an indoor ambient temperature T;

[0006] Calculate T 内 The difference between the set temperature T;

[0007] In T 内 Before reaching T, the compressor frequency and the outdoor fan speed are gradually reduced according to the change of △T1 until the compressor frequency is reduced to the minimum set frequency and the outdoor fan speed is reduced to the minimum set outdoor fan speed.

[0008] When the above technical solution is adopted, during cooling, the indoor ambient temperature T 内 Gradually decrease, indoor ambient temperature T during heating 内 Gradually increase, whether cooling or heating, at the indoor ambient temperature T 内 Before reaching the set temperature T, according to T 内 The difference between T and T changes, gradually reducing the compressor frequency and outdoor fan speed. By intervening in the air conditioner's operating state before the air conditioner reaches the temperature, the indoor temperature can be kept stable, avoiding rapid temperature shutdown and frequent start and stop, thereby reducing noise.

[0009] In the optional technical solution of the above-mentioned air conditioner control method, "in T 内 Before reaching T, the step of gradually reducing the compressor frequency and the outdoor fan speed according to the change of △T1 further includes:

[0010] When the air conditioner is in cooling operation, 内Before reaching T, the compressor frequency and outdoor fan speed are gradually reduced as △T1 gradually decreases.

[0011] In the case of adopting the above technical solution, when the air conditioner is in cooling operation, the compressor first runs at the set frequency, and the outdoor fan runs at the set outdoor fan speed. As the indoor ambient temperature gradually decreases, before the indoor ambient temperature reaches the set temperature, that is, before the indoor ambient temperature drops to less than or equal to the set temperature, as the indoor temperature gradually decreases and gradually approaches the set temperature, △T1 also gradually decreases. Therefore, in a period of time before the indoor temperature reaches the set temperature, the compressor frequency and the outdoor fan speed are gradually reduced until the compressor frequency is reduced to the minimum set compressor frequency set by the user or a person skilled in the art, and the outdoor fan speed is reduced to the minimum set speed, so as to avoid rapid temperature shutdown and maintain a stable change in indoor temperature.

[0012] In an optional technical solution of the above-mentioned air conditioner control method, the control method includes:

[0013] Get the indoor coil temperature T 内盘 ;

[0014] Calculate T 内 and T 内盘 The difference between △T2;

[0015] Before △T2 reaches the first preset value, the indoor fan speed is gradually reduced as △T2 decreases, and the expansion valve opening is gradually reduced; until the indoor fan speed is reduced to the minimum set indoor fan speed, the expansion valve opening is reduced to the set minimum opening;

[0016] Among them, the first preset value is T 内 The difference between the indoor ambient temperature and the indoor coil temperature after reaching T.

[0017] In the case of adopting the above technical solution, after the air conditioner is turned on for cooling operation, the indoor ambient temperature gradually decreases, and the indoor coil temperature begins to decrease rapidly. When the operation is stable, the indoor coil temperature also remains stable, and the indoor ambient temperature continues to decrease until it reaches the set temperature. Correspondingly, the change trend of △T2 is to gradually decrease and then maintain a stable value. Therefore, before △T2 decreases to the first preset value, the indoor fan speed is reduced in advance, and the opening of the expansion valve is reduced to maintain a low air outlet temperature to ensure the cooling effect, until it is reduced to the minimum set indoor fan speed and the set minimum opening. In this way, the indoor unit temperature is maintained at a stable level and indoor noise is minimized.

[0018] In the optional technical solution of the above-mentioned air conditioner control method, "in T 内 Before reaching T, the step of gradually reducing the compressor frequency and the outdoor fan speed according to the change of △T1 further includes:

[0019] When the air conditioner is in heating mode, 内 Before reaching T, the compressor frequency and outdoor fan speed are gradually reduced as △T1 gradually increases.

[0020] In the case of adopting the above technical solution, when the air conditioner is in heating operation, the compressor first runs at the set frequency, and the outdoor fan runs at the set outdoor fan speed. As the indoor temperature gradually rises, before the indoor temperature reaches the set temperature, that is, before the indoor ambient temperature rises to be greater than or equal to the set temperature, as the indoor temperature gradually approaches the set temperature, △T1 also gradually increases. Therefore, in a period of time before the indoor temperature reaches the set temperature, the compressor frequency and the outdoor fan speed are gradually reduced until the compressor frequency is reduced to the minimum set compressor frequency set by the user or a person skilled in the art, and the outdoor fan speed is reduced to the minimum set outdoor fan speed, so as to avoid rapid temperature shutdown and maintain a stable change in the indoor temperature.

[0021] In an optional technical solution of the above-mentioned air conditioner control method, the control method includes:

[0022] Get the outdoor ambient temperature T 外 , outdoor coil temperature T 外盘 ;

[0023] Calculate T 外 and T 外盘 The difference between △T3;

[0024] Before △T3 reaches the second preset value, the speed of the indoor fan is gradually reduced as △T3 gradually increases, and the opening of the expansion valve is gradually reduced; until the speed of the indoor fan is reduced to the minimum set indoor fan speed, and the opening of the expansion valve is reduced to the set minimum opening;

[0025] Wherein, the second preset value is T 内 The difference between the outdoor ambient temperature and the outdoor coil temperature after reaching T.

[0026] When the above technical solution is adopted, after the air conditioner is turned on and the heating is running, T 外 Remain unchanged, T 外盘 It starts to decrease rapidly, and when it runs smoothly, T 外盘 Maintain stability, T 外盘 Under low temperature conditions, the condenser is prone to frost. The trend of △T3 is to gradually increase and maintain a stable value (it will stabilize for a certain period of time before frosting and then increase again, and then it will enter the easy frosting state). 外盘Before reaching the second preset value, the speed of the indoor fan is reduced in advance according to △T3, and the opening of the expansion valve is reduced to maintain a high air outlet temperature to ensure the heating effect, until it is reduced to the minimum speed and the minimum valve opening. Indoor noise can be minimized under stable operation. At the same time, reducing the indoor speed can also delay the time to enter defrosting and reduce the frosting state. In this way, the indoor unit temperature is kept stable and indoor noise is minimized.

[0027] In an optional technical solution of the above-mentioned air conditioner control method, the control method includes:

[0028] In T 内 After reaching T, the machine will run in the non-stop mode.

[0029] The specific steps to achieve non-stop temperature mode include:

[0030] When the air conditioner is in cooling operation and △T1≤the first set temperature value, the compressor operates at the lowest set frequency, the outdoor fan operates at the lowest set outdoor fan speed, the indoor fan operates at the lowest set indoor fan speed, and the expansion valve opening is the first set opening value;

[0031] When the third set temperature value>ΔT1≥the second set temperature value, the expansion valve opening is reduced to the second set opening value; wherein, the first set temperature value<the second set temperature value, and the first set opening value>the second set opening value.

[0032] In the case of adopting the above technical solution, after the air conditioner has been running for a period of time with high frequency, high speed, and small opening of the expansion valve for high-speed cooling, until △T1≤the first set temperature value, the air conditioner frequency and outdoor fan speed are reduced, and the expansion valve is kept at a large opening on the basis of maintaining the low frequency and low speed of the air conditioner. At this time, the cooling capacity is very low, and the indoor temperature can be kept from falling further. As the air conditioner runs at a low cooling capacity, the indoor ambient temperature gradually rises. Until the third set temperature value>△T1≥the second set temperature value, the expansion valve is restored to a throttling state with a small opening to maintain a certain cooling capacity.

[0033] In an optional technical solution of the above-mentioned air conditioner control method, the control method includes:

[0034] In T 内 After reaching T, the machine will run in the non-stop mode.

[0035] The specific steps to achieve non-stop temperature mode include:

[0036] When the air conditioner is in heating operation and △T1 ≥ the fifth set temperature value, the compressor operates at the lowest set frequency, the outdoor fan operates at the lowest set outdoor fan speed, the indoor fan operates at the lowest set indoor fan speed, and the expansion valve operates at the first set opening value;

[0037] When the seventh set temperature value ≤ △T1 < the sixth set temperature value, the expansion valve opening is reduced to the second set opening value; wherein, the fifth set temperature value > the sixth set temperature value, and the first set opening value > the second set opening value.

[0038] In the case of adopting the above technical solution, after the air conditioner has been running for a period of time with high frequency, high speed, and small opening of the expansion valve for high-speed heating, until △T1 ≥ the fifth set temperature value, the air conditioner frequency, outdoor fan speed, and indoor fan speed are reduced, and the air conditioner maintains low frequency, low speed, and a large opening of the expansion valve. The expansion valve is throttled at a large opening. At this time, the heating capacity is very low, and the indoor temperature can be kept from rising. When the indoor temperature drops, when the seventh set temperature value ≤ △T1 < the sixth set temperature value, the expansion valve is restored to a small opening throttling state to maintain a certain heating capacity.

[0039] In the optional technical solution of the control method of the air conditioner, "when the air conditioner is in cooling operation, at T 内 Before reaching T, gradually reducing the compressor frequency and outdoor fan speed as △T1 gradually decreases” further includes:

[0040] When the second refrigeration temperature value is less than △T1 ≤ the first refrigeration temperature value, the compressor frequency is reduced by the first refrigeration frequency value based on the first set frequency, and the outdoor unit speed is reduced by the first refrigeration speed value based on the first set speed;

[0041] When the third refrigeration temperature value is less than △T1 ≤ the second refrigeration temperature value, the compressor frequency is reduced by the second refrigeration frequency value based on the first set frequency, and the outdoor unit speed is reduced by the second refrigeration speed value based on the first set speed;

[0042] Among them, the first refrigeration frequency value is less than the second refrigeration frequency value, and the first refrigeration speed value is less than the second refrigeration speed value.

[0043] When the above technical solution is adopted, the indoor temperature is kept stable by gradually reducing the compressor frequency and the outdoor unit speed.

[0044] In the optional technical solution of the control method of the air conditioner, when the air conditioner is in heating mode, 内 Before reaching T, the compressor frequency and outdoor fan speed are gradually reduced as △T1 gradually increases” further includes:

[0045] When the first heating temperature value is ≤△T1<the second heating temperature value, the compressor frequency is reduced by the first heating frequency value based on the second set frequency, and the outdoor unit speed is reduced by the first heating speed value based on the second set speed;

[0046] When the second heating temperature value ≤ △T1 < the third heating temperature value, the compressor frequency is reduced by the second heating frequency value based on the second set frequency, and the outdoor unit speed is reduced by the second heating speed value based on the second set speed;

[0047] The first heating frequency value is less than the second heating frequency value; the first heating speed value is less than the second heating speed value.

[0048] When the above technical solution is adopted, the indoor temperature is kept stable by gradually reducing the compressor frequency and the outdoor unit speed.

[0049] 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 of the above technical solutions.

[0050] It is understood by those skilled in the art that the air conditioner control method of the present invention includes obtaining the indoor environment temperature T 内 , calculate T 内 The difference between T and T1 is △T1, at T 内 Before reaching T, the compressor frequency and the outdoor fan speed are gradually reduced according to the change of △T1 until the compressor frequency is reduced to the minimum set frequency and the outdoor fan speed is reduced to the minimum set outdoor fan speed.

[0051] When the above technical solution is adopted, the indoor environment temperature T 内 Gradually decrease, indoor ambient temperature T during heating 内 Gradually increase, whether cooling or heating, at the indoor ambient temperature T 内 Before reaching the set temperature T, according to T 内 The difference between T and T changes, gradually reducing the compressor frequency and outdoor fan speed. By intervening in the air conditioner's operating state before the air conditioner reaches the temperature, the indoor temperature can be kept stable, avoiding rapid temperature shutdown and frequent start and stop, thereby reducing noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0053] Figure 1 is a flow chart of the main steps of the control method of the air conditioner of the present invention;

[0054] Figure 2 is a flowchart of specific steps of a first embodiment of a method for controlling an air conditioner of the present invention;

[0055] Figure 3is a flowchart of specific steps of a second embodiment of the air conditioner control method of the present invention;

[0056] Figure 4 is a flowchart of the specific steps of a first embodiment of the air conditioner control method of the present invention;

[0057] Figure 5 is a flowchart of specific steps of a first embodiment of a method for controlling an air conditioner of the present invention;

[0058] Figure 6 is a flowchart of specific steps of a second embodiment of the air conditioner control method of the present invention;

[0059] Figure 7 It is a flowchart of the specific steps of the second embodiment of the air conditioner control method of the present invention. DETAILED DESCRIPTION

[0060] 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.

[0061] Specifically, the air conditioner of the present invention includes an indoor unit, an outdoor unit and a refrigerant circulation loop arranged between the indoor unit and the outdoor unit, the indoor unit includes an indoor coil and an indoor fan, and the outdoor unit includes an outdoor coil, an outdoor fan and a variable frequency compressor. The indoor coil, the outdoor coil and the variable frequency compressor are all arranged on the refrigerant circulation loop, and the refrigerant circulates between the indoor and outdoor through the refrigerant circulation loop to exchange heat with the indoor environment through the indoor unit, thereby meeting the heat exchange needs of the user, the indoor fan is used to blow air indoors, and the outdoor fan is used for heat dissipation of the outdoor unit and to accelerate air flow. During use, the user can control the operation of the air conditioner by setting the temperature. It can be understood by those skilled in the art that the present invention does not impose any restrictions on the specific structure of the air conditioner, and the technician can set the specific structure of the air conditioner according to the actual use requirements, as long as each outdoor unit in the air conditioner has a variable frequency compressor; the change of such specific application objects does not deviate from the basic principle of the present invention and belongs to the protection scope of the present invention.

[0062] Furthermore, the air conditioner further includes an outdoor temperature sensor, an indoor temperature sensor, an indoor coil sensor, an outdoor coil sensor and a controller. The outdoor temperature sensor can detect the ambient temperature of the outdoor unit, the outdoor coil sensor can detect the temperature of the outdoor coil, and there is no restriction on the detection position, which can be set by those skilled in the art as needed. The indoor temperature sensor can detect the ambient temperature of the indoor unit, 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.

[0063] The controller can obtain the outdoor ambient temperature, the indoor ambient temperature, the indoor coil temperature and the outdoor coil temperature, and the controller can also control the operating state of the air conditioner. For example, the operation of the indoor fan and the outdoor fan can be controlled, and the frequency of the variable frequency compressor can be controlled. 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.

[0064] like Figure 1 As shown, in order to solve the noise problem caused by frequent start and stop of the existing air conditioner after reaching the temperature, the main steps of the air conditioner control method of the present invention include:

[0065] Step S10: Obtain the indoor ambient temperature T 内 ;

[0066] Step S20: Calculate T 内 The difference between the set temperature T and the set temperature T1;

[0067] Step S30: At T 内 Before reaching T, the compressor frequency and the outdoor fan speed are gradually reduced according to the change of △T1 until the compressor frequency is reduced to the minimum set frequency and the outdoor fan speed is reduced to the minimum set outdoor fan speed.

[0068] The set temperature T is the air conditioning target temperature set by the user through the remote control or buttons.

[0069] During cooling, the indoor ambient temperature T 内 Gradually decrease, indoor ambient temperature T during heating 内 Gradually increase, whether cooling or heating, at the indoor ambient temperature T 内 Before reaching the set temperature T, according to T 内 The difference between T and T changes, gradually reducing the compressor frequency and outdoor fan speed. By intervening in the air conditioner's operating state before the air conditioner reaches the temperature, the indoor temperature can be kept stable, avoiding rapid temperature shutdown, reducing the start-stop frequency, and thus reducing noise.

[0070] like Figure 2 As shown, in a possible implementation manner, the specific steps of the air conditioner control method include:

[0071] Step S41: the air conditioner is in cooling operation;

[0072] Step S42: Obtaining the indoor ambient temperature T 内 , Indoor coil temperature T 内盘 ;

[0073] Step S43: Calculate T 内 The difference between T and T1;

[0074] Step S44: Calculate T 内 and T 内盘 The difference between them is △T2.

[0075] The indoor ambient temperature and the indoor coil temperature are obtained through sensors, and then the difference △T1 between the indoor ambient temperature and the set temperature, and the difference △T2 between the indoor ambient temperature and the indoor coil temperature are calculated.

[0076] Step S45: At T 内 Before reaching T, as △T1 gradually decreases, the compressor frequency and the outdoor fan speed are gradually reduced until the compressor frequency is reduced to the minimum set frequency and the outdoor fan speed is reduced to the minimum set outdoor fan speed.

[0077] When the air conditioner is in cooling operation, the compressor first runs at the set frequency, and the outdoor fan runs at the set outdoor fan speed. As the indoor ambient temperature gradually decreases, before the indoor ambient temperature reaches the set temperature, that is, before the indoor ambient temperature drops to less than or equal to the set temperature, as the indoor temperature gradually decreases and gradually approaches the set temperature, △T1 also gradually decreases. Therefore, in a period of time before the indoor temperature reaches the set temperature, the compressor frequency and the outdoor fan speed are gradually reduced until the compressor frequency is reduced to the minimum set compressor frequency set by the user or technicians in this field, and the outdoor fan speed is reduced to the minimum set speed, so as to avoid rapid temperature shutdown and maintain a stable change in indoor temperature.

[0078] Step S46: before ΔT2 reaches the first preset value, the indoor fan speed is gradually reduced as ΔT2 decreases, and the expansion valve opening is gradually reduced until the indoor fan speed is reduced to the minimum set indoor fan speed and the expansion valve opening is reduced to the set minimum opening; wherein the first preset value is T 内 ≤T is the difference between the indoor ambient temperature and the indoor coil temperature.

[0079] The first preset value may be obtained by a person skilled in the art through experiments and stored in advance in the air conditioner, or may be set by the person skilled in the art according to actual needs.

[0080] After the air conditioner is turned on for cooling operation, the indoor ambient temperature gradually decreases, and the indoor coil temperature begins to decrease rapidly. When the operation is stable, the indoor coil temperature also remains stable, and the indoor ambient temperature continues to decrease until it reaches the set temperature. Correspondingly, the change trend of △T2 is to gradually decrease and then maintain a stable value. Therefore, before △T2 decreases to the first preset value, the indoor fan speed is reduced in advance, and the opening of the expansion valve is reduced to maintain a low air outlet temperature to ensure the cooling effect, until it is reduced to the minimum set indoor fan speed and the set minimum opening. In this way, the indoor unit temperature is maintained at a stable level and indoor noise is minimized.

[0081] Step S45 further includes:

[0082] Step: when the second refrigeration temperature value is less than △T1 ≤ the first refrigeration temperature value, the compressor frequency is reduced by the first refrigeration frequency value based on the first set frequency, and the outdoor unit speed is reduced by the first refrigeration speed value based on the first set speed;

[0083] Step: when the third refrigeration temperature value is less than △T1 ≤ the second refrigeration temperature value, the compressor frequency is reduced by the second refrigeration frequency value based on the first set frequency, and the outdoor unit speed is reduced by the second refrigeration speed value based on the first set speed;

[0084] Step: when the fourth refrigeration temperature value is less than △T1 ≤ the third refrigeration temperature value, the compressor frequency is reduced by the third refrigeration frequency value based on the first set frequency, and the outdoor unit speed is reduced by the third refrigeration speed value based on the first set speed;

[0085] Step: when the fifth refrigeration temperature value is less than △T1 ≤ the fourth refrigeration temperature value, the compressor frequency is reduced by a fourth refrigeration frequency value based on the first set frequency, and the outdoor unit speed is reduced by a fourth refrigeration speed value based on the first set speed;

[0086] Step: when the sixth refrigeration temperature value is less than △T1 ≤ the fifth refrigeration temperature value, the compressor frequency is reduced by the fifth refrigeration frequency value based on the first set frequency, and the outdoor unit speed is reduced by the fifth refrigeration speed value based on the first set speed;

[0087] Step: when the seventh refrigeration temperature value is less than △T1 ≤ the sixth refrigeration temperature value, the compressor frequency is reduced by the sixth refrigeration frequency value based on the first set frequency, and the outdoor unit speed is reduced by the sixth refrigeration speed value based on the first set speed;

[0088] Steps: When △T1≤the seventh cooling temperature value, the compressor frequency is reduced to the minimum set frequency, and the outdoor unit speed is reduced to the minimum set outdoor fan speed.

[0089] Among them, the first refrigeration frequency value is less than the second refrigeration frequency value, the third refrigeration frequency value, the fourth refrigeration frequency value, the fifth refrigeration frequency value, and the sixth refrigeration frequency value. The first refrigeration speed value is less than the second refrigeration speed value, the third refrigeration speed value, the fourth refrigeration speed value, the fifth refrigeration speed value, and the sixth refrigeration speed value.

[0090] Maintains a smooth change in indoor temperature by gradually reducing the compressor frequency and outdoor unit speed.

[0091] Reference Figure 4 The following is an example to describe step S45 in detail:

[0092] Specifically, the first refrigeration temperature value is set to 3°C, the second refrigeration temperature value is set to 2°C, the third refrigeration temperature value is set to 1°C, the fourth refrigeration temperature value is set to 0°C, the fifth refrigeration temperature value is set to -1°C, the sixth refrigeration temperature value is set to -2°C, and the seventh refrigeration temperature value is set to -3°C.

[0093] Step S451: When 2°C<△T1≤3°C, the compressor frequency is reduced by 5% based on the first set frequency, and the outdoor unit speed is reduced by 3% based on the first set speed;

[0094] Step S452: When 1°C < ΔT1 ≤ 2°C, the compressor frequency is reduced by 15% based on the first set frequency, and the outdoor unit speed is reduced by 10% based on the first set speed;

[0095] Step S453: When 0°C < ΔT1 ≤ 1°C, the compressor frequency is reduced by 25% based on the first set frequency, and the outdoor unit speed is reduced by 17% based on the first set speed;

[0096] Step S454: when -1°C<△T1≤0°C, the compressor frequency is reduced by 35% based on the first set frequency, and the outdoor unit speed is reduced by 24% based on the first set speed;

[0097] Step S455: when -2°C<△T1≤-1°C, the compressor frequency is reduced by 45% based on the first set frequency, and the outdoor unit speed is reduced by 31% based on the first set speed;

[0098] Step S456: when -3°C<△T1≤-2°C, the compressor frequency is reduced by 55% based on the first set frequency, and the outdoor unit speed is reduced by 38% based on the first set speed;

[0099] Step S457: When ΔT1 ≤ -3°C, the compressor frequency is reduced to the minimum set frequency, and the outdoor unit speed is reduced to the minimum set outdoor fan speed.

[0100] When the air conditioner is in cooling operation, the compressor runs at the first set frequency and the outdoor unit runs at the first set speed. As △T1 gradually decreases, it is reduced by percentage based on the first set frequency and the first set speed until it is reduced to the minimum set frequency and the minimum set outdoor fan speed.

[0101] In step S46, step S47 is executed.

[0102] Step S47: At T 内 After reaching T, the machine will run in non-stop mode.

[0103] That is to say, when △T1≤the seventh cooling temperature value, the machine will run in the non-stop mode when the temperature reaches the target.

[0104] When △T1≤the seventh cooling temperature value, it means that the indoor ambient temperature has reached the target temperature, and the air conditioner will be operated in the non-stop mode to reach the set temperature without stopping. The compressor, outdoor fan and indoor unit are always in operation to reduce noise and keep the indoor temperature within a certain range.

[0105] Specifically, refer to Figure 5 When cooling, the non-stop mode of reaching the temperature includes the following steps:

[0106] Step S471: When △T1≤the first set temperature value, the compressor runs at the lowest set frequency, the outdoor fan runs at the lowest set outdoor fan speed, the indoor fan runs at the lowest set indoor fan speed, and the expansion valve opening is the first set opening value.

[0107] Optionally, the first set temperature value is -3°C.

[0108] When the air conditioner runs at high frequency, high speed and small expansion valve opening for a period of time, until △T1≤-3℃, the air conditioning frequency and outdoor fan speed are reduced, and the expansion valve is kept at a large opening while maintaining the air conditioner at low frequency and low speed. At this time, the cooling capacity is very low, and the indoor temperature can be kept from dropping further.

[0109] Step S472: When the third set temperature value>ΔT1≥the second set temperature value, the opening of the expansion valve is reduced to the second set opening value; wherein the first set opening value>the second set opening value.

[0110] Optionally, the second set temperature value is set to 1°C, and the third set temperature value is set to 2°C.

[0111] As the air conditioner operates at low cooling capacity, the indoor ambient temperature gradually rises until 2℃>△T1≥1℃, and the expansion valve is restored to a small opening throttling state to maintain a certain cooling capacity.

[0112] Step S473: when the fourth set temperature value>ΔT1≥the third set temperature value, the expansion valve maintains the second set opening value, the compressor frequency increases by the first frequency value based on the minimum set frequency, and the outdoor fan speed increases by the first speed value based on the minimum set outdoor fan speed;

[0113] Step S474: when △T1≥the fourth set temperature value, the expansion valve maintains the second set opening value, the compressor frequency increases by a second frequency value based on the minimum set frequency, and the outdoor fan speed increases by a second speed value based on the minimum set outdoor fan speed; the first frequency value is less than the second frequency value, and the first speed value is less than the second speed value.

[0114] Optionally, the fourth set temperature value is set to 3°C.

[0115] The expansion valve maintains a small opening throttling state, and the cooling capacity is relatively small. When 3℃>△T1≥2℃, the indoor temperature continues to rise, and the speed of the compressor and the outdoor fan is increased at a relatively small rate. For example, the compressor frequency and the outdoor fan speed are increased by 3% on the basis of the minimum frequency and the minimum outdoor fan speed. When △T1≥3℃, the speed of the compressor and the outdoor fan is increased at a relatively fast rate. For example, the compressor frequency and the outdoor fan speed are increased by 5% on the basis of the minimum frequency and the minimum outdoor fan speed.

[0116] The air conditioner operates with high frequency, high speed and large cooling capacity with small opening throttling until △T1≤-3℃, then reduces the frequency and outdoor fan speed and increases the expansion valve opening, and repeats this cycle.

[0117] In the non-stop mode when the temperature is reached, the indoor fan speed can always be maintained at the lowest set indoor fan speed, or it can be automatically adjusted as the indoor temperature changes in the automatic mode. As long as the indoor fan is always turned on, technical personnel in this field can set it according to actual needs.

[0118] like Figure 3 As shown, in a possible implementation manner, the specific steps of the air conditioner control method include:

[0119] Step S51: the air conditioner operates in heating mode;

[0120] Step S52: Obtain the indoor ambient temperature T 内 , Outdoor ambient temperature T 外 , outdoor coil temperature T 外盘 ;

[0121] Step S53: Calculate T 内 The difference between T and T1;

[0122] Step S54: Calculate T 外 and T外盘 The difference between △T3;

[0123] Step S55: At T 内 Before reaching T, as △T1 gradually increases, the compressor frequency and the outdoor fan speed are gradually reduced until the compressor frequency is reduced to the minimum set compressor frequency and the outdoor fan speed is reduced to the minimum set outdoor fan speed.

[0124] When the air conditioner is in heating mode, the compressor first runs at the set frequency, and the outdoor fan runs at the set outdoor fan speed. As the indoor temperature gradually rises, before the indoor temperature reaches the set temperature, that is, before the indoor ambient temperature rises to a temperature greater than or equal to the set temperature, as the indoor temperature gradually approaches the set temperature, △T1 also gradually increases. Therefore, in the period before the indoor temperature reaches the set temperature, the compressor frequency and the outdoor fan speed are gradually reduced until the compressor frequency is reduced to the minimum set compressor frequency set by the user or a person skilled in the art, and the outdoor fan speed is reduced to the minimum set outdoor fan speed, to avoid rapid temperature shutdown and maintain a stable change in the indoor temperature.

[0125] Step S56: before ΔT3 reaches the second preset value, the speed of the indoor fan and the opening of the expansion valve are gradually reduced as ΔT3 gradually increases, until the compressor frequency reaches the lowest set frequency and the expansion valve opening reaches the set minimum opening; wherein the second preset value is T 内 ≥T is the difference between the outdoor ambient temperature and the outdoor coil temperature.

[0126] After the air conditioner is turned on and the heating is running, T 外 Remain unchanged, T 外盘 It starts to decrease rapidly, and when it runs smoothly, T 外盘 Maintain stability, T 外盘 Under low temperature conditions, the condenser is prone to frost. The trend of △T3 is to gradually increase and maintain a stable value (it will stabilize for a certain period of time before frosting and then increase again, and then it will enter the easy frosting state). 外盘 Before reaching the second preset value, the speed of the indoor fan is reduced in advance according to △T3, and the opening of the expansion valve is reduced to maintain a high air outlet temperature to ensure the heating effect, until it is reduced to the minimum speed and the minimum valve opening. Indoor noise can be minimized under stable operation. At the same time, reducing the indoor speed can also delay the time to enter defrosting and reduce the frosting state. In this way, the indoor unit temperature is maintained at a stable level and indoor noise is minimized. It should be noted that the speed of the indoor fan can be reduced in automatic mode, and the speed cannot be changed when the wind gear is locked.

[0127] Step S55 further includes the following steps:

[0128] Step: when the first heating temperature value ≤ △T1 < the second heating temperature value, the compressor frequency is reduced by the first heating frequency value based on the second set frequency, and the outdoor unit speed is reduced by the first heating speed value based on the second set speed;

[0129] Step: when the second heating temperature value ≤ △T1 < the third heating temperature value, the compressor frequency is reduced by the second heating frequency value based on the second set frequency, and the outdoor unit speed is reduced by the second heating speed value based on the second set speed;

[0130] Step: when the third heating temperature value ≤ △T1 < the fourth heating temperature value, the compressor frequency is reduced by a third heating frequency value based on the second set frequency, and the outdoor unit speed is reduced by a third heating speed value based on the second set speed;

[0131] Step: when the fourth heating temperature value ≤ △T1 < the fifth heating temperature value, the compressor frequency is reduced by a fourth heating frequency value based on the second set frequency, and the outdoor unit speed is reduced by a fourth heating speed value based on the second set speed;

[0132] Step: when the fifth heating temperature value ≤ △T1 < the sixth heating temperature value, the compressor frequency is reduced by the fifth heating frequency value based on the second set frequency, and the outdoor unit speed is reduced by the fifth heating speed value based on the second set speed;

[0133] Step: when the sixth heating temperature value ≤ △T1 < the seventh heating temperature value, the compressor frequency is reduced by the sixth heating frequency value based on the second set frequency, and the outdoor unit speed is reduced by the sixth heating speed value based on the second set speed;

[0134] Steps: When △T1 ≥ the seventh heating temperature value, the compressor frequency is reduced to the minimum set frequency, and the outdoor unit speed is reduced to the minimum set outdoor fan speed.

[0135] Among them, the first heating frequency value is less than the second heating frequency value, less than the third heating frequency value, less than the fourth heating frequency value, less than the fifth heating frequency value, less than the sixth heating frequency value. The first heating speed value is less than the second heating speed value, less than the third heating speed value, less than the fourth heating speed value, less than the fifth heating speed value, less than the sixth heating speed value.

[0136] Specifically, refer to Figure 6 , the following is an example to describe step S55 in detail:

[0137] The first heating temperature value is set to -3°C, the second heating temperature value is set to -2°C, the third heating temperature value is set to -1°C, the fourth heating temperature value is set to 0°C, the fifth heating temperature value is set to 1°C, the sixth heating temperature value is set to 2°C, and the seventh heating temperature value is set to 3°C.

[0138] Step S551: when -3°C≤△T1<-2°C, the compressor frequency is reduced by 5% based on the second set frequency, and the outdoor unit speed is reduced by 3% based on the second set speed;

[0139] Step S552: when -2°C≤△T1<-1°C, the compressor frequency is reduced by 15% based on the second set frequency, and the outdoor unit speed is reduced by 10% based on the second set speed;

[0140] Step S553: ​​when -1°C≤△T1<0°C, the compressor frequency is reduced by 25% based on the second set frequency, and the outdoor unit speed is reduced by 17% based on the second set speed;

[0141] Step S554: when 0°C≤△T1<1°C, the compressor frequency is reduced by 35% based on the second set frequency, and the outdoor unit speed is reduced by 24% based on the second set speed;

[0142] Step S555: when 1°C≤△T1<2°C, the compressor frequency is reduced by 45% based on the second set frequency, and the outdoor unit speed is reduced by 31% based on the second set speed;

[0143] Step S556: When 2°C≤△T1<3°C, the compressor frequency is reduced by 55% based on the second set frequency, and the outdoor unit speed is reduced by 38% based on the second set speed;

[0144] Step S557: When ΔT1 ≥ 3°C, the compressor frequency is reduced to the minimum set frequency, and the outdoor unit speed is reduced to the minimum set outdoor fan speed.

[0145] Step S57: At T 内 After reaching T, the machine will run in non-stop mode.

[0146] That is to say, when △T1 ≥ the seventh heating temperature value, the machine will run without stopping when the temperature reaches the target.

[0147] When △T1≥the seventh heating temperature value, it means that the indoor ambient temperature has reached the target temperature, and the system will operate in the non-stop mode.

[0148] Specifically, refer to Figure 7 When heating, the non-stop mode includes the following steps:

[0149] Step S571: When ΔT1 ≥ the fifth set temperature value, the compressor operates at the lowest set frequency, the outdoor fan operates at the lowest set outdoor fan speed, the indoor fan operates at the lowest set indoor fan speed, and the expansion valve opening is the first set opening value.

[0150] Optionally, the fifth set temperature value is set to 3°C.

[0151] When the air conditioner runs for a period of time with high frequency, high speed and small opening of the expansion valve for high-speed heating, until △T1 ≥ 3℃, the air conditioning frequency, outdoor fan speed and indoor fan speed are reduced, and the air conditioner maintains low frequency, low speed and large opening of the expansion valve. The expansion valve is throttled at a large opening. At this time, the heating capacity is very low and the indoor temperature can be kept from rising.

[0152] Step S572: When the seventh set temperature value ≤ ΔT1 < the sixth set temperature value, the opening of the expansion valve is reduced to the second set opening value; wherein the first set opening value > the second set opening value.

[0153] The sixth set temperature value is set to -1°C, and the seventh set temperature value is set to -2°C.

[0154] When the indoor temperature drops to -2℃≤△T1<-1℃, the expansion valve is restored to a small opening throttling state to maintain a certain heating capacity.

[0155] Step S573: when the eighth set temperature value is less than ΔT1 ≤ the seventh set temperature value, the compressor frequency is increased by a third frequency value, and the outdoor fan speed is increased by a third speed value;

[0156] Step S574: when ΔT1 ≤ the eighth set temperature value, the compressor frequency is increased by a fourth frequency value, and the outdoor fan speed is increased by a fourth speed value; the third frequency value is less than the fourth frequency value, and the third speed value is less than the fourth speed value.

[0157] The eighth set temperature value is set to -3°C.

[0158] The indoor ambient temperature continues to decrease. When -3℃<△T1≤-2℃, the speed of the compressor and the outdoor fan increases slowly. For example, the compressor frequency and the outdoor fan speed increase by 3% on the basis of the current frequency and speed, respectively. When △T1≤-3℃, the speed of the compressor and the outdoor fan increases at a relatively fast rate. For example, the compressor frequency and the outdoor fan speed increase by 5% on the basis of the current frequency and speed, respectively.

[0159] The air conditioner operates at high frequency, high speed and small opening for throttling heating until △T1≥3℃, then the frequency and outdoor fan speed are reduced and the expansion valve opening is increased, and this cycle repeats.

[0160] To sum up, the air conditioner of the present invention maintains a stable change in indoor temperature by intervening in the operating state of the air conditioner in advance before the temperature is reached, and runs in a non-stop mode after the temperature is reached. The air conditioner always runs continuously to avoid frequent start and stop, and indoor noise is minimized while maintaining stable operation at the temperature.

[0161] 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.

[0162] 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.

[0163] 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 indoor ambient temperature T 内 ; Calculate T 内 The difference between the set temperature T; In T 内 Before reaching T, the compressor frequency and the outdoor fan speed are gradually reduced according to the change of △T1 until the compressor frequency is reduced to the minimum set frequency and the outdoor fan speed is reduced to the minimum set outdoor fan speed.

2. The air conditioner control method according to claim 1, characterized in that: "In T 内 Before reaching T, the step of gradually reducing the compressor frequency and the outdoor fan speed according to the change of △T1 further includes: When the air conditioner is in cooling operation, 内 Before reaching T, the compressor frequency and outdoor fan speed are gradually reduced as △T1 gradually decreases.

3. The air conditioner control method according to claim 2, characterized in that: The control method comprises: Get the indoor coil temperature T 内盘 ; Calculate T 内 and T 内盘 The difference between △T2; Before △T2 reaches the first preset value, the indoor fan speed is gradually reduced as △T2 decreases, and the expansion valve opening is gradually reduced; until the indoor fan speed is reduced to the minimum set indoor fan speed, the expansion valve opening is reduced to the set minimum opening; Among them, the first preset value is T 内 The difference between the indoor ambient temperature and the indoor coil temperature after reaching T.

4. The air conditioner control method according to claim 1, characterized in that: "In T 内 Before reaching T, the step of gradually reducing the compressor frequency and the outdoor fan speed according to the change of △T1 further includes: When the air conditioner is in heating mode, 内 Before reaching T, the compressor frequency and outdoor fan speed are gradually reduced as △T1 gradually increases.

5. The air conditioner control method according to claim 4, characterized in that: The control method comprises: Get the outdoor ambient temperature T 外 , outdoor coil temperature T 外盘 ; Calculate T 外 and T 外盘 The difference between △T3; Before △T3 reaches the second preset value, the speed of the indoor fan is gradually reduced as △T3 gradually increases, and the opening of the expansion valve is gradually reduced; until the speed of the indoor fan is reduced to the minimum set indoor fan speed, and the opening of the expansion valve is reduced to the set minimum opening; Wherein, the second preset value is T 内 The difference between the outdoor ambient temperature and the outdoor coil temperature after reaching T.

6. The air conditioner control method according to claim 2, characterized in that: The control method comprises: In T 内 After reaching T, the machine will run in the non-stop mode. The specific steps to achieve non-stop temperature mode include: When the air conditioner is in cooling operation and △T1≤the first set temperature value, the compressor operates at the lowest set frequency, the outdoor fan operates at the lowest set outdoor fan speed, the indoor fan operates at the lowest set indoor fan speed, and the expansion valve opening is the first set opening value; When the third set temperature value>ΔT1≥the second set temperature value, the expansion valve opening is reduced to the second set opening value; wherein, the first set temperature value<the second set temperature value, and the first set opening value>the second set opening value.

7. The air conditioner control method according to claim 4, characterized in that: The control method comprises: In T 内 After reaching T, the machine will run in the non-stop mode. The specific steps to achieve non-stop temperature mode include: When the air conditioner is in heating operation and △T1 ≥ the fifth set temperature value, the compressor operates at the lowest set frequency, the outdoor fan operates at the lowest set outdoor fan speed, the indoor fan operates at the lowest set indoor fan speed, and the expansion valve operates at the first set opening value; When the seventh set temperature value ≤ △T1 < the sixth set temperature value, the expansion valve opening is reduced to the second set opening value; wherein, the fifth set temperature value > the sixth set temperature value, and the first set opening value > the second set opening value.

8. The air conditioner control method according to claim 2, characterized in that: "When the air conditioner is in cooling operation, at T 内 Before reaching T, gradually reducing the compressor frequency and outdoor fan speed as △T1 gradually decreases” further includes: When the second refrigeration temperature value is less than △T1 ≤ the first refrigeration temperature value, the compressor frequency is reduced by the first refrigeration frequency value based on the first set frequency, and the outdoor unit speed is reduced by the first refrigeration speed value based on the first set speed; When the third refrigeration temperature value is less than △T1 ≤ the second refrigeration temperature value, the compressor frequency is reduced by the second refrigeration frequency value based on the first set frequency, and the outdoor unit speed is reduced by the second refrigeration speed value based on the first set speed; Among them, the first refrigeration frequency value is less than the second refrigeration frequency value, and the first refrigeration speed value is less than the second refrigeration speed value.

9. The air conditioner control method according to claim 4, characterized in that: "When the air conditioner is in heating mode, 内 Before reaching T, the compressor frequency and outdoor fan speed are gradually reduced as △T1 gradually increases” further includes: When the first heating temperature value is ≤△T1<the second heating temperature value, the compressor frequency is reduced by the first heating frequency value based on the second set frequency, and the outdoor unit speed is reduced by the first heating speed value based on the second set speed; When the second heating temperature value ≤ △T1 < the third heating temperature value, the compressor frequency is reduced by the second heating frequency value based on the second set frequency, and the outdoor unit speed is reduced by the second heating speed value based on the second set speed; The first heating frequency value is less than the second heating frequency value; the first heating speed value is less than the second heating speed value.

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.

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