Refrigeration comfort control method for variable-frequency air conditioner

Abstract

The invention provides a refrigeration comfort control method for a variable-frequency air conditioner, and relates to the technical field of air conditioners, in a refrigeration mode, if room temperature is reduced to a first preset temperature, the operation frequency of a compressor is reduced to the minimum operation frequency, and meanwhile, the opening degree of an electronic expansion valve is increased by Z steps, so that the cooling effect is slowed down; if the room temperature is reduced to a second preset temperature, the rotating speed of an indoor fan motor is reduced to the lowest gear rotating speed used by a user, and meanwhile, an air guide swing blade or an air guide piece of an indoor unit is adjusted to the minimum angle, so that the cooling effect is further reduced, and if the room temperature is reduced to the overshoot shutdown temperature of the compressor, the compressor is shut down. And if the room temperature rises to the third preset temperature again, the compressor is started, circulation control is carried out again, the problem that peculiar smell appears in refrigeration of an existing variable frequency air conditioner is solved, and the control method is suitable for variable frequency air conditioner control.

Description

Technical Field

[0001] The invention relates to the technical field of air conditioning, and in particular to a method for controlling refrigeration comfort of a variable frequency air conditioner. Background Art

[0002] There have been many complaints in the air conditioning market about indoor odors when the room temperature is lower than the set temperature and the compressor stops during the cooling mode. However, the odor disappears when the room temperature rises and the air conditioning compressor resumes normal cooling or dehumidification. Dehumidification mode is a type of cooling mode.

[0003] Through in-depth analysis and research, it was found that in cooling or dehumidification mode, when the indoor temperature is lower than the set temperature and temperature overshoot occurs, the compressor will stop outputting cooling capacity to the inside. The temperature overshoot control logic is that the compressor stops, and the indoor fan motor continues to operate according to the wind speed set by the user. After the indoor temperature rises and exceeds the set temperature, the outdoor compressor resumes operation. It can be seen that in cooling or dehumidification mode, during the period when the room temperature overshoots and the compressor stops, the indoor fan will continue to operate at the set wind speed, the moisture on the surface of the evaporator will quickly evaporate, the surface of the evaporator fins will become dry, and the indoor dust or ozone molecules will be blown out with the indoor air without the removal and adsorption of condensed water. Therefore, many users will feel that the indoor smell is normal when the cooling or dehumidification is operating normally, but they can smell a strange smell or odor once the room temperature overshoots and the compressor stops.

[0004] Prior art, such as the invention patent application with application number CN202411023220.6, discloses an air conditioning control method, an air conditioner and a computer-readable storage medium, wherein the control method includes: the air conditioner is in cooling operation, when the air conditioner works for the first preset time, the temperature difference between the user set temperature and the current indoor ambient temperature is obtained, and whether the temperature overshoot occurs is confirmed according to the temperature difference, and if so, the fresh air mode is turned on for temperature adjustment, and the opening of the fresh air valve and / or the speed of the fresh air fan are controlled according to the range of the temperature difference. The application of the present invention can realize rapid callback after the room temperature overshoots, and avoid the user's discomfort after the room temperature overshoots.

[0005] The above-mentioned refrigeration overshoot is achieved by opening the opening and closing angle of the indoor fresh air device and the speed of the fresh air fan, so as to increase the indoor temperature and reduce the probability of overshoot shutdown. The disadvantage of this solution is that it may cause large fluctuations in room temperature. The principle of overshoot shutdown is that the room temperature drops to or below the set temperature. In this scenario, the temperature of the outdoor fresh air introduced is definitely higher than the indoor temperature, and the room temperature will rise quickly. The air conditioner may quickly increase the frequency of cooling and cooling to maintain the set temperature. There is a high probability of room temperature fluctuations and reduced comfort. In addition, the introduction of fresh air will increase the power of the fresh air motor and increase the indoor heat load. The power of the whole machine will inevitably increase, which will affect the energy efficiency and is not conducive to power saving. Summary of the invention

[0006] The technical problem solved by the present invention is to provide a method for controlling the cooling comfort of a variable frequency air conditioner, so as to solve the problem of odor in the cooling of the existing variable frequency air conditioner.

[0007] The present invention solves the above technical problems by adopting a technical solution: a variable frequency air conditioner cooling comfort control method, comprising the following steps:

[0008] S1, the air conditioner is running in cooling mode. If the room temperature drops to a first preset temperature, the process goes to S2. The first preset temperature is equal to the sum of the user-set temperature and the first set value.

[0009] S2, reduce the compressor operating frequency to the minimum operating frequency, and increase the opening of the electronic expansion valve by Z steps. If the room temperature drops to the second preset temperature, enter S3. If the room temperature is higher than the first preset temperature, enter S1. The second preset temperature is equal to the sum of the user-set temperature and the second set value. The first set value is greater than the second set value.

[0010] S3, reduce the speed of the indoor fan motor to the lowest gear speed used by the user, and adjust the indoor unit air guide blade or air guide sheet to the minimum angle. If the room temperature drops to the overshoot shutdown temperature, the compressor stops and enters S4. If the room temperature is higher than the second preset temperature, enter S2. The overshoot shutdown temperature is equal to the difference between the user-set temperature and the third set value.

[0011] S4. Reduce the speed of the indoor fan motor to a preset speed, which is lower than the lowest gear speed used by the user. If the room temperature returns to the third preset temperature, the compressor starts and enters S3. The third preset temperature is equal to the sum of the user-set temperature and the fourth set value.

[0012] Furthermore, the first set value ranges from 0.7°C to 0.9°C.

[0013] Furthermore, the second set value ranges from 0.4°C to 0.6°C.

[0014] Furthermore, the third set value ranges from 0°C to 0.5°C.

[0015] Furthermore, the fourth set value ranges from 0°C to 0.3°C.

[0016] Beneficial effects of the present invention: The present invention provides a method for controlling refrigeration comfort of a variable frequency air conditioner. In the refrigeration mode, if the room temperature drops to a first preset temperature, the operating frequency of the compressor is reduced to the minimum operating frequency, and the opening of the electronic expansion valve is increased by Z steps, thereby reducing the air conditioning refrigeration capacity output and slowing down the cooling effect. If the room temperature drops to a second preset temperature, the speed of the indoor fan motor is reduced to the lowest gear speed used by the user, and the indoor unit air guide blades or air guide sheets are adjusted to the minimum angle, thereby further reducing the refrigeration capacity output. If the room temperature drops to the compressor overshoot shutdown temperature, the compressor stops, and the speed of the indoor fan motor is reduced to a preset speed, thereby slowing down the evaporation of condensed water on the surface of the indoor evaporator, so that the surface of the evaporator maintains a certain humidity. If the room temperature returns to the third preset temperature, the compressor is started and the circulation control is re-performed, thereby solving the problem of odor in the existing variable frequency air conditioner refrigeration. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flow chart of a method for controlling refrigeration comfort of a variable frequency air conditioner provided by the present invention. DETAILED DESCRIPTION

[0018] The present invention aims to solve the problem of odor in the existing variable frequency air conditioner cooling, and provides a variable frequency air conditioner cooling comfort control method, such as Figure 1 As shown, the following steps are included:

[0019] S1. The air conditioner is running in cooling mode. If the room temperature drops to a first preset temperature, S2 is entered. The first preset temperature is equal to the sum of the user-set temperature and the first set value. Specifically, the first set value ranges from 0.7°C to 0.9°C.

[0020] S2. Reduce the operating frequency of the compressor to the minimum operating frequency, and increase the opening of the electronic expansion valve by Z steps. If the room temperature drops to the second preset temperature, enter S3. If the room temperature is higher than the first preset temperature, enter S1. The second preset temperature is equal to the sum of the user-set temperature and the second set value. The first set value is greater than the second set value. Specifically, the second set value ranges from 0.4°C to 0.6°C.

[0021] S3, reduce the speed of the indoor fan motor to the lowest gear speed used by the user, and adjust the indoor unit air guide blades or air guide plates to the minimum angle. If the room temperature drops to the overshoot shutdown temperature, the compressor stops and enters S4. If the room temperature is higher than the second preset temperature, enter S2. The overshoot shutdown temperature is equal to the difference between the user-set temperature and the third set value; specifically, the third set value ranges from 0°C to 0.5°C.

[0022] S4. Reduce the speed of the indoor fan motor to a preset speed, which is lower than the lowest gear speed used by the user. If the room temperature returns to the third preset temperature, the compressor starts and enters S3. The third preset temperature is equal to the sum of the user-set temperature and the fourth set value; specifically, the fourth set value ranges from 0°C to 0.3°C.

[0023] Example:

[0024] Taking the user setting temperature as 20°C as an example, the first setting value is 0.7°C, the second setting value is 0.4°C, the third setting value is 0.5°C, and the fourth setting value is 0.2°C as an example, the present invention is further explained.

[0025] From the above four set values ​​and the user set temperature, it can be seen that the first preset temperature is 20.7°C, the second preset temperature is 20.4°C, the overshoot shutdown temperature is 19.5°C, and the third preset temperature is 20.2°C.

[0026] The method for controlling the cooling comfort of a variable frequency air conditioner comprises the following steps:

[0027] S1, the air conditioner is running in cooling mode, the room temperature is gradually reduced, and when the room temperature drops to 20.7℃, it enters S2;

[0028] S2, reduce the compressor operating frequency to the minimum operating frequency, the minimum operating frequency is lower than 10Hz, and increase the opening of the electronic expansion valve by Z steps, the value range of Z is 100 to 150, so as to reduce the air conditioning refrigeration capacity output and slow down the cooling effect, so the room temperature may continue to drop or rise. If the room temperature is higher than 20.7℃, enter S1, if the room temperature drops to 20.4℃, enter S3;

[0029] S3, reduce the speed of the indoor fan motor to the lowest gear speed used by the user, and adjust the indoor unit air guide blades or air guide sheets to the minimum angle, so as to further reduce the cooling capacity output and slow down the cooling effect. Therefore, the room temperature may continue to drop or rise. If the room temperature is higher than 20.4℃, enter S2. If the room temperature drops to 19.5℃, the compressor stops and enters S4.

[0030] S4, reduce the speed of the indoor fan motor to a preset speed, the preset speed is lower than the lowest gear speed used by the user, take 1.5HP variable frequency hanging machine as an example, the preset speed is 200rpm to 250rpm, thereby slowing down the evaporation of condensed water on the surface of the indoor evaporator, so that the surface of the evaporator maintains a certain humidity. Since the compressor is stopped, the compressor output refrigeration capacity output is zero, so the room temperature rises. If the room temperature rises to 20.2℃, the compressor starts. Since 20.2℃ is less than 20.4℃, enter S3.

[0031] Through the above control method, during the cooling process, the closer the room temperature is to the user-set temperature, the lower the cooling capacity output of the variable frequency air conditioner, which delays the shutdown of the compressor. If the room temperature drops to the over-adjustment shutdown temperature, the compressor stops and the speed of the indoor fan motor is reduced to the preset speed, slowing down the evaporation of condensed water on the surface of the indoor evaporator so that the surface of the evaporator maintains a certain humidity to avoid odor.

Claims

1. A method for controlling cooling comfort of a variable frequency air conditioner, characterized in that: The following steps are involved: S1, the air conditioner is running in cooling mode. If the room temperature drops to a first preset temperature, the process goes to S2. The first preset temperature is equal to the sum of the user-set temperature and the first set value. S2, reduce the compressor operating frequency to the minimum operating frequency, and increase the opening of the electronic expansion valve by Z steps. If the room temperature drops to the second preset temperature, enter S3. If the room temperature is higher than the first preset temperature, enter S1. The second preset temperature is equal to the sum of the user-set temperature and the second set value. The first set value is greater than the second set value. S3, reduce the speed of the indoor fan motor to the lowest gear speed used by the user, and adjust the indoor unit air guide blade or air guide sheet to the minimum angle. If the room temperature drops to the overshoot shutdown temperature, the compressor stops and enters S4. If the room temperature is higher than the second preset temperature, enter S2. The overshoot shutdown temperature is equal to the difference between the user-set temperature and the third set value. S4. Reduce the speed of the indoor fan motor to a preset speed, which is lower than the lowest gear speed used by the user. If the room temperature returns to the third preset temperature, the compressor starts and enters S3. The third preset temperature is equal to the sum of the user-set temperature and the fourth set value.

2. The method for controlling cooling comfort of a variable frequency air conditioner according to claim 1, characterized in that: The first set value ranges from 0.7°C to 0.9°C.

3. The method for controlling cooling comfort of a variable frequency air conditioner according to claim 1, characterized in that: The second set value ranges from 0.4°C to 0.6°C.

4. The method for controlling cooling comfort of a variable frequency air conditioner according to claim 1, characterized in that: The third setting value ranges from 0°C to 0.5°C.

5. The method for controlling cooling comfort of a variable frequency air conditioner according to claim 1, characterized in that: The fourth set value ranges from 0°C to 0.3°C.

Images