Control method and device of air conditioner and air conditioner

Abstract

The application provides a control method and device of an air conditioner and the air conditioner. The method comprises the following steps: obtaining a first difference between an indoor environment temperature and an air conditioner set temperature after the air conditioner is started and runs for a preset time length; if the air conditioner runs in a cooling mode, in the case that the first difference is greater than a first temperature difference threshold and the indoor environment temperature is greater than the air conditioner set temperature, if a second difference between a fin temperature and an indoor unit outlet air temperature is greater than a first heat exchange threshold, the indoor unit rotating speed is increased; and if the second difference is less than or equal to the first heat exchange threshold, the compressor frequency is increased. The embodiment of the application can determine the cooling demand based on the difference between the indoor environment temperature and the air conditioner set temperature and determine the heat exchange condition based on the difference between the fin temperature and the indoor unit outlet air temperature, and then comprehensively adjust the compressor frequency and the indoor unit rotating speed, so as to accurately control the heat exchange demand and the power, and the cooling / heating demand of the user and energy saving can be considered.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioner comfort control, in particular to an air conditioner control method and device and an air conditioner. BACKGROUND

[0002] There are two intuitive representations of air-side heat exchange capacity of an air conditioner: fin heat exchange capacity and air heat exchange capacity, and the formulas are as follows: Q = hA △ t = W △ ha, wherein h is the convective heat transfer coefficient of the fin surface and air, A is the contact area of the fin and air, △ t is the temperature difference between the fin surface and air, and W is the air volume, △ ha is the enthalpy difference of the inlet and outlet air.

[0003] During the operation of the air conditioner, the refrigeration capacity can be adjusted by adjusting the compressor frequency and the rotation speed of the indoor and outdoor fans, but there is a problem that the refrigeration / heating demand and energy saving cannot be considered at the same time. SUMMARY

[0004] To solve the above problem, the present application provides an air conditioner control method, which comprises: obtaining a first difference value between the indoor environment temperature and the air conditioner set temperature after the air conditioner is started and operated for a preset time length; if the air conditioner is operated in a refrigeration mode, in the case that the first difference value is greater than a first temperature difference threshold and the indoor environment temperature is greater than the air conditioner set temperature, if a second difference value between the fin temperature and the indoor unit outlet air temperature is greater than a first heat exchange threshold, the rotation speed of the indoor unit is increased; if the second difference value is less than or equal to the first heat exchange threshold, the compressor frequency is increased; in the case that the first difference value is less than the first temperature difference threshold, if the second difference value is greater than a second heat exchange threshold, the compressor frequency is reduced; if the second difference value is less than or equal to the second heat exchange threshold and greater than or equal to a third heat exchange threshold, the current compressor frequency and indoor unit rotation speed are maintained; if the second difference value is less than the third heat exchange threshold, the rotation speed of the indoor unit is reduced; in the case that the first difference value is greater than the first temperature difference threshold and the indoor environment temperature is less than the air conditioner set temperature, if the second difference value is greater than a fourth heat exchange threshold, the compressor frequency is reduced; if the second difference value is less than or equal to the fourth heat exchange threshold, the rotation speed of the indoor unit is reduced.

[0005] The present application can determine the refrigeration demand based on the difference value between the indoor environment temperature and the air conditioner set temperature and determine the heat exchange condition based on the difference value between the fin temperature and the indoor unit outlet air temperature, and then comprehensively adjust the compressor frequency and the indoor unit rotation speed, so as to accurately control the heat exchange capacity demand and power, and consider the refrigeration demand and energy saving of the user at the same time.

[0006] Optionally, the method further comprises: if the air conditioner operates in the heating mode, in the case that the first difference is greater than a second temperature difference threshold and the indoor environment temperature is less than the air conditioner set temperature, if the second difference is greater than a fifth heat exchange threshold, increasing the indoor unit rotating speed; if the second difference is less than or equal to the fifth heat exchange threshold, increasing the compressor frequency; in the case that the first difference is less than the second temperature difference threshold, if the second difference is greater than a sixth heat exchange threshold, decreasing the compressor frequency; if the second difference is less than or equal to the sixth heat exchange threshold and greater than or equal to a seventh heat exchange threshold, keeping the current compressor frequency and indoor unit rotating speed; if the second difference is less than the seventh heat exchange threshold, decreasing the indoor unit rotating speed; in the case that the first difference is greater than the second temperature difference threshold and the indoor environment temperature is greater than the air conditioner set temperature, if the second difference is greater than an eighth heat exchange threshold, decreasing the compressor frequency; if the second difference is less than or equal to the eighth heat exchange threshold, decreasing the indoor unit rotating speed.

[0007] The embodiment of the present application can determine the refrigeration demand based on the difference between the indoor environment temperature and the air conditioner set temperature, determine the heat exchange condition based on the difference between the fin temperature and the indoor unit air outlet temperature, and then comprehensively adjust the compressor frequency and the indoor unit rotating speed, so as to accurately control the heat exchange amount demand and power, and can take into account the heating demand and energy saving of the user.

[0008] Optionally, the method further comprises: in the case that the first difference is greater than the first temperature difference threshold and the indoor environment temperature is less than the air conditioner set temperature, if the second difference is greater than the fourth heat exchange threshold, decreasing the indoor unit rotating speed; or, in the case that the first difference is greater than the first temperature difference threshold and the indoor environment temperature is less than the air conditioner set temperature, if the second difference is less than or equal to the fourth heat exchange threshold, decreasing the compressor frequency.

[0009] In the embodiment of the present application, in the case that the indoor environment temperature is too low, the indoor unit rotating speed and the compressor frequency can be further reduced, the cold amount can be reduced, and the energy can be saved.

[0010] Optionally, the method further comprises: in the case that the first difference is greater than the second temperature difference threshold and the indoor environment temperature is greater than the air conditioner set temperature, if the second difference is greater than the eighth heat exchange threshold, decreasing the indoor unit rotating speed; or, in the case that the first difference is greater than the second temperature difference threshold and the indoor environment temperature is greater than the air conditioner set temperature, if the second difference is less than or equal to the eighth heat exchange threshold, decreasing the compressor frequency.

[0011] In the embodiment of the present application, in the case that the indoor environment temperature is too high, the indoor unit rotating speed and the compressor frequency can be further reduced, the heat amount can be reduced, and the energy can be saved.

[0012] Optionally, the first temperature difference threshold value ranges from 2 to 4 degrees Celsius; or, the first heat exchange threshold value, the second heat exchange threshold value, the third heat exchange threshold value, and the fourth heat exchange threshold value range from 3 to 5 degrees Celsius, the third heat exchange threshold value is less than the second heat exchange threshold value; or, the indoor unit rotation speed change value ranges from 50 r / min to 100 r / min; or, the compressor frequency change value ranges from 1 hz to 3 hz.

[0013] The embodiment of the present application provides the value range of each parameter, and the compressor frequency and the indoor unit rotation speed can be controlled based on the value range, and the cooling demand of the user and energy saving are considered.

[0014] Optionally, the second temperature difference threshold value ranges from 2 to 4 degrees Celsius; or, the fifth heat exchange threshold value, the sixth heat exchange threshold value, the seventh heat exchange threshold value, and the eighth heat exchange threshold value range from 3 to 5 degrees Celsius, the third heat exchange threshold value is less than the second heat exchange threshold value; or, the indoor unit rotation speed change value ranges from 50 r / min to 100 r / min; or, the compressor frequency change value ranges from 1 hz to 3 hz.

[0015] The embodiment of the present application provides the value range of each parameter, and the compressor frequency and the indoor unit rotation speed can be controlled based on the value range, and the heating demand of the user and energy saving are considered.

[0016] Optionally, the method further comprises: acquiring the fin temperature through a sensor arranged at the end of the fin in the air outlet direction, and acquiring the indoor unit air outlet temperature through a temperature sensor arranged at the evaporator air outlet.

[0017] The embodiment of the present application provides the acquisition mode of the fin temperature and the indoor unit air outlet temperature, and the temperature acquisition precision is improved.

[0018] The embodiment of the present application provides a control device of an air conditioner, the device comprises: an acquisition module, configured to acquire a first difference value between an indoor environment temperature and an air conditioner set temperature after the air conditioner is started and runs for a preset time length; an adjustment module, configured to, if the air conditioner runs in a cooling mode, in the case that the first difference value is greater than a first temperature difference threshold value and the indoor environment temperature is greater than the air conditioner set temperature, if a second difference value between a fin temperature and an indoor unit outflow temperature is greater than a first heat exchange threshold value, increasing an indoor unit rotating speed; if the second difference value is less than or equal to the first heat exchange threshold value, increasing a compressor frequency; in the case that the first difference value is less than the first temperature difference threshold value, if the second difference value is greater than a second heat exchange threshold value, decreasing the compressor frequency; if the second difference value is less than or equal to the second heat exchange threshold value and greater than or equal to a third heat exchange threshold value, keeping the current compressor frequency and indoor unit rotating speed; if the second difference value is less than the third heat exchange threshold value, decreasing the indoor unit rotating speed; in the case that the first difference value is greater than the first temperature difference threshold value and the indoor environment temperature is less than the air conditioner set temperature, if the second difference value is greater than a fourth heat exchange threshold value, decreasing the compressor frequency; if the second difference value is less than or equal to the fourth heat exchange threshold value, decreasing the indoor unit rotating speed.

[0019] The embodiment of the present application provides an air conditioner, comprising a computer readable storage medium storing a computer program and a processor, when the computer program is read and run by the processor, the above method is realized.

[0020] The embodiment of the present application provides a computer readable storage medium, the computer readable storage medium stores a computer program, when the computer program is read and run by the processor, the above method is realized.

[0021] The control device of the air conditioner and the air conditioner of the present application can achieve the same technical effects as the control method of the air conditioner. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A schematic flow chart of a control method of an air conditioner in the embodiment of the present application is shown;

[0023] Figure 2 A cooling logic schematic diagram of a control method of an air conditioner provided by the embodiment of the present application is shown;

[0024] Figure 3 A heating logic schematic diagram of a control method of an air conditioner provided by the embodiment of the present application is shown;

[0025] Figure 4 A structural schematic diagram of a control device of an air conditioner in the embodiment of the present application is shown. DETAILED DESCRIPTION

[0026] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following provides a detailed description of specific embodiments of the present invention with reference to the accompanying drawings.

[0027] For a finished air conditioner, its heat exchange area A remains constant. To minimize power while ensuring heat exchange effect, it can be regulated by coarsely adjusting the lifting frequency and finely adjusting the blower speed.

[0028] In the above formula Q = hA △ t = W △ ha, △ t refers to the temperature difference between the fin microelement and the nearby air. Generally, in the direction from the air inlet to the air outlet, this temperature difference gradually decreases. Therefore, only the temperature difference at the end of the fin in the air outlet direction needs to be concerned, and this temperature difference is generally controlled at 3°C - 5°C as the best. Therefore, this embodiment provides a control method for frequency and blower speed for monitoring the heat exchange temperature difference of the fins.

[0029] Since the air velocity distribution in the indoor unit is close to the average distribution, it is assumed here that the air velocity in the indoor unit is equal everywhere. Therefore, the fin temperature measurement points can be set at any fin. A temperature sensor, taking the thermocouple as an example, can be arranged on the side close to the indoor unit controller and connected to the end of the fin at the air outlet to measure the fin temperature t p It is converted into an electromotive force signal and transmitted to the controller to judge the temperature. In addition, an extra temperature sensing probe is added to measure the air outlet temperature tc of the evaporator.

[0030] A series of judgments are made on the set temperature t0 of the air conditioner, the indoor ambient temperature ta, the fin temperature tp, and the air outlet temperature tc of the indoor unit to judge the regulation actions.

[0031] Figure 1 The following shows a schematic flowchart of a control method for an air conditioner in an embodiment of the present invention. The method includes the following steps:

[0032] S102, after the air conditioner is turned on and runs for a preset duration, obtain the first difference between the indoor ambient temperature and the set temperature of the air conditioner.

[0033] When the air conditioner is turned on, it generally runs at the maximum frequency. As the indoor temperature changes, the frequency will decrease accordingly. Exemplarily, after running at a non - maximum frequency for 10 minutes, the steps of the method provided in this embodiment are started. Further, judgment can be made again every 2 minutes thereafter.

[0034] S104, if the air conditioner is running in the cooling mode, when the first difference is greater than the first temperature difference threshold and the indoor ambient temperature is greater than the set temperature of the air conditioner, if the second difference between the fin temperature and the air outlet temperature of the indoor unit is greater than the first heat exchange threshold, increase the speed of the indoor unit; if the second difference is less than or equal to the first heat exchange threshold, increase the compressor frequency.

[0035] If the indoor ambient temperature is higher than the air conditioner's set temperature, and the temperature difference between the two exceeds the first temperature difference threshold, it indicates a large gap between the ambient temperature and the set temperature, requiring increased cooling capacity. Specifically, this fin temperature can be the temperature at the fin tip.

[0036] In this case, if the difference between the fin temperature and the indoor unit's outlet air temperature is greater than the first heat exchange threshold, it means that the fins still have residual cooling capacity. In this case, the indoor fan speed can be increased to increase the airflow and carry the cooling capacity out of the fins. If the difference between the fin temperature and the indoor unit's outlet air temperature is less than or equal to the first heat exchange threshold, it means that the fins are close to their limit and there is no residual cooling capacity. In this case, simply increasing the indoor fan speed will not increase the cooling capacity. Instead, the compressor frequency should be increased.

[0037] S106, if the first difference is less than the first temperature difference threshold, and the second difference is greater than the second heat exchange threshold, then the compressor frequency is reduced; if the second difference is less than or equal to the second heat exchange threshold and greater than or equal to the third heat exchange threshold, then the current compressor frequency and indoor unit speed are maintained; if the second difference is less than the third heat exchange threshold, then the indoor unit speed is reduced.

[0038] If the first difference is less than the first temperature difference threshold, the difference between the ambient temperature and the set temperature is small, and it is sufficient to keep the room temperature stable.

[0039] In this case, if the difference between the fin temperature and the indoor unit's outlet air temperature is greater than the second heat exchange threshold, it indicates that the residual cooling capacity of the fins is large, and the compressor frequency can be reduced; if the difference between the fin temperature and the indoor unit's outlet air temperature is less than or equal to the second heat exchange threshold and greater than or equal to the third heat exchange threshold, no action is taken; if the difference between the fin temperature and the indoor unit's outlet air temperature is less than the third heat exchange threshold, it indicates that the fin heat exchange temperature difference is small, which deviates from the optimal temperature difference, i.e., the air volume is too large, and the indoor fan speed is reduced.

[0040] S108, if the first difference is greater than the first temperature difference threshold and the indoor ambient temperature is less than the air conditioner set temperature, if the second difference is greater than the fourth heat exchange threshold, the compressor frequency is reduced; if the second difference is less than or equal to the fourth heat exchange threshold, the indoor unit speed is reduced.

[0041] If the indoor ambient temperature is lower than the air conditioner's set temperature, and the temperature difference between the two is greater than the first temperature difference threshold, it means that the ambient temperature is already lower than the set temperature, the indoor ambient temperature is too low, and the cooling capacity needs to be reduced.

[0042] In this case, if the difference between the fin temperature and the indoor unit's outlet air temperature is greater than the fourth heat exchange threshold, it indicates that there is too much residual cooling capacity in the fins, and the compressor frequency can be reduced; if the difference between the fin temperature and the indoor unit's outlet air temperature is less than or equal to the fourth heat exchange threshold, it indicates that the fins are close to their limit and there is no residual cooling capacity, and the indoor fan speed can be reduced.

[0043] Considering that the indoor temperature is already too low under these circumstances, the following operations can be performed in addition to the above control actions:

[0044] If the first temperature difference is greater than the first temperature difference threshold and the indoor ambient temperature is lower than the air conditioner's set temperature, and the second temperature difference is greater than the fourth heat exchange threshold, then the indoor unit speed should be reduced; or...

[0045] If the first difference is greater than the first temperature difference threshold and the indoor ambient temperature is less than the air conditioner's set temperature, and the second difference is less than or equal to the fourth heat exchange threshold, then the compressor frequency is reduced.

[0046] By further reducing the indoor unit speed and compressor frequency, the cooling capacity can be reduced and energy can be saved.

[0047] The air conditioner control method provided in this embodiment of the invention can determine the cooling demand based on the difference between the indoor ambient temperature and the air conditioner set temperature, and determine the heat exchange status based on the difference between the fin temperature and the indoor unit outlet air temperature. Then, it comprehensively adjusts the compressor frequency and the indoor unit speed to accurately control the heat exchange demand and power, which can take into account both the user's cooling needs and energy saving.

[0048] Optionally, the first temperature difference threshold is in the range of 2℃ to 4℃; the first heat exchange threshold, the second heat exchange threshold, the third heat exchange threshold, and the fourth heat exchange threshold are in the range of 3℃ to 5℃, and the third heat exchange threshold is less than the second heat exchange threshold; or, the indoor unit speed change value is in the range of 50r / min to 100r / min; or, the compressor frequency change value is in the range of 1Hz to 3Hz.

[0049] If the air conditioner is operating in heating mode, the above method may also include the following steps:

[0050] If the air conditioner is operating in heating mode, and the first temperature difference is greater than the second temperature difference threshold and the indoor ambient temperature is less than the air conditioner's set temperature, if the second temperature difference is greater than the fifth heat exchange threshold, the indoor unit speed will be increased; if the second temperature difference is less than or equal to the fifth heat exchange threshold, the compressor frequency will be increased.

[0051] If the indoor ambient temperature is lower than the air conditioner's set temperature, and the temperature difference between the two is greater than the second temperature difference threshold, it indicates that the difference between the ambient temperature and the set temperature is large, and more heat is needed.

[0052] In this case, if the difference between the fin temperature and the indoor unit's outlet air temperature is greater than the fifth heat exchange threshold, it means that the fins still have residual heat. The indoor fan speed can be increased to increase the air volume and carry away the heat from the fins. If the difference between the fin temperature and the indoor unit's outlet air temperature is less than or equal to the fifth heat exchange threshold, it means that the fins are close to their limit and there is no residual heat. In this case, simply increasing the indoor fan speed will not increase the heat output; instead, the compressor frequency should be increased.

[0053] If the first temperature difference is less than the second temperature difference threshold, and the second temperature difference is greater than the sixth heat exchange threshold, then the compressor frequency is reduced; if the second temperature difference is less than or equal to the sixth heat exchange threshold and greater than or equal to the seventh heat exchange threshold, then the current compressor frequency and indoor unit speed are maintained; if the second temperature difference is less than the seventh heat exchange threshold, then the indoor unit speed is reduced.

[0054] If the first temperature difference is less than the second temperature difference threshold, the difference between the ambient temperature and the set temperature is small, and it is sufficient to keep the room temperature stable.

[0055] In this case, if the difference between the fin temperature and the indoor unit's outlet air temperature is greater than the sixth heat exchange threshold, it indicates that the residual heat in the fins is large, and the compressor frequency can be reduced; if the difference between the fin temperature and the indoor unit's outlet air temperature is less than or equal to the sixth heat exchange threshold and greater than or equal to the seventh heat exchange threshold, no action is taken; if the difference between the fin temperature and the indoor unit's outlet air temperature is less than the eighth heat exchange threshold, it indicates that the fin heat exchange temperature difference is small, which deviates from the optimal temperature difference, i.e., the air volume is too large, so the indoor fan speed is reduced to ensure cooling capacity while reducing operating power.

[0056] If the first difference is greater than the second temperature difference threshold and the indoor ambient temperature is greater than the air conditioner's set temperature, then if the second difference is greater than the eighth heat exchange threshold, the compressor frequency will be reduced; if the second difference is less than or equal to the eighth heat exchange threshold, the indoor unit speed will be reduced.

[0057] If the indoor ambient temperature is higher than the air conditioner's set temperature, and the temperature difference between the two is greater than the second temperature difference threshold, it means that the ambient temperature is already higher than the set temperature, the indoor ambient temperature is too high, and the heat needs to be reduced.

[0058] In this case, if the difference between the fin temperature and the indoor unit's outlet air temperature is greater than the eighth heat exchange threshold, it indicates that the fin heat exchange temperature difference is too large and the fins store too much heat, so the compressor frequency can be reduced; if the difference between the fin temperature and the indoor unit's outlet air temperature is less than or equal to the eighth heat exchange threshold, it indicates that the fin heat exchange temperature difference is too small and there is no residual heat, so the indoor fan speed can be reduced.

[0059] Considering that the indoor temperature is already too high in this situation, the following operations can be performed in addition to the above control actions:

[0060] If the first temperature difference is greater than the second temperature difference threshold and the indoor ambient temperature is greater than the air conditioner's set temperature, and if the second temperature difference is greater than the eighth heat exchange threshold, then the indoor unit speed should be reduced; or...

[0061] If the first difference is greater than the second temperature difference threshold and the indoor ambient temperature is greater than the air conditioner's set temperature, then if the second difference is less than or equal to the eighth heat exchange threshold, the compressor frequency will be reduced.

[0062] By further reducing the indoor unit speed and compressor frequency, heat generation can be reduced and energy can be saved.

[0063] Optionally, the second temperature difference threshold ranges from 2℃ to 4℃; or, the fifth, sixth, seventh, and eighth heat exchange thresholds range from 3℃ to 5℃, and the third heat exchange threshold is less than the second heat exchange threshold; or, the indoor unit speed change ranges from 50r / min to 100r / min; or, the compressor frequency change ranges from 1Hz to 3Hz.

[0064] The air conditioner control method provided in this embodiment of the invention can determine the cooling demand based on the difference between the indoor ambient temperature and the air conditioner set temperature, and determine the heat exchange status based on the difference between the fin temperature and the indoor unit outlet air temperature. Then, it comprehensively adjusts the compressor frequency and the indoor unit speed to accurately control the heat exchange demand and power, which can take into account both the user's heating needs and energy saving.

[0065] The control logic in cooling mode is described in detail below. Figure 2 This invention illustrates a refrigeration logic diagram of an air conditioner control method provided in an embodiment of the present invention, including the following steps:

[0066] S201, the air conditioner is turned on and running in cooling mode. The air conditioner starts at its maximum frequency, and as the indoor temperature decreases, the frequency will decrease accordingly. After running at a non-maximum frequency for 10 minutes, the first judgment will be made, and thereafter the judgment will be re-made every 2 minutes.

[0067] S202, determine whether ta-t0 > 2℃. If yes, execute S202; otherwise, execute S202.

[0068] At this point, the ambient temperature differs significantly from the set temperature, necessitating adjustments to increase cooling capacity.

[0069] S203, determine if tc-tp > 3℃. If yes, proceed to S204; otherwise, proceed to S205.

[0070] S204, indoor unit speed increased by 50 r / min. There is still residual cold air in the fins, so the indoor unit speed is increased by 50 r / min to increase the airflow and carry away the cold air.

[0071] S205, compressor frequency increased by 1 Hz. The fin heat exchange is nearing its limit, at which point the compressor frequency is increased by 1 Hz.

[0072] The low temperature of the fins is transferred from the low-temperature refrigerant to the low-temperature tube, and then to the fins. If the temperature at the end of the fins is too close to the ambient temperature, the overall average temperature difference of the fins will not be too large. This means that the amount of cold energy stored in the fins is limited, and the amount of cold energy transferred to the edges is insufficient. In this case, the cold source must be increased. The airflow only carries the cold energy from the cold source out. Simply increasing the airflow cannot further increase the output cold energy.

[0073] S206, determine if |ta-t0|≤2℃ is satisfied. If yes, proceed to S207; otherwise, proceed to S212. At this point, the difference between the ambient temperature and the set temperature is small, and it is sufficient to maintain a stable room temperature.

[0074] S207, determine if tc-tp > 5℃. If yes, proceed to S208; otherwise, proceed to S209.

[0075] S208, frequency reduced by 2 Hz. There is a large amount of residual cold on the fins, hence the 2 Hz frequency reduction.

[0076] S209, determine if tc-tp≥3℃ is satisfied. If yes, proceed to S210; otherwise, proceed to S211.

[0077] S210, do not perform any action.

[0078] S211, the indoor unit speed decreases by 50 r / min. The finned heat exchange temperature difference is small, deviating from the optimal temperature difference, which means the air volume is too high. The indoor unit speed decreases by 50 r / min to ensure cooling while reducing power.

[0079] From Q = W(h) in -h out W represents air volume, h in h out This refers to the enthalpy of the inlet and outlet air. The enthalpy of air is related to both the dry-bulb and wet-bulb temperatures. The indoor unit's speed decreases to reduce airflow, increasing the average temperature difference of the fins and thus the heat transfer coefficient. in -h out The volume increases, while the airflow decreases, partially offsetting each other.

[0080] The prerequisite for doing this is that the room temperature has reached the set temperature within the allowable error range. Reducing the air volume can reduce the power without significantly changing the capacity. The important thing is that the temperature difference between the fins and the air increases, the heat exchange efficiency increases, and the amount of cold air blown out per unit of air increases.

[0081] S212, determine if tc-tp > 3℃. If yes, proceed to S213; otherwise, proceed to S214.

[0082] S213, frequency reduced by 2 Hz. The indoor temperature is too low, and there is too much residual cold air in the fins, so the frequency is reduced by 2 Hz.

[0083] Reducing the frequency decreases the refrigerant flow rate, resulting in a decrease in cooling capacity. Furthermore, this leads to a larger temperature difference in the fins, which will be even greater if the airflow is reduced. Between lowering the rotational speed and reducing the frequency, if the same amount of capacity is to be reduced, reducing the frequency will result in a greater power reduction.

[0084] S214, indoor unit speed reduced by 100 r / min. Indoor temperature is too low, fin temperature difference is small, therefore indoor unit speed reduced by 100 r / min.

[0085] The control logic in heating mode is described in detail below. Figure 3 This invention illustrates a heating logic diagram of an air conditioner control method provided in an embodiment of the present invention, including the following steps:

[0086] S301, the air conditioner is turned on and running in heating mode. After the air conditioner has been running normally for 10 minutes, the following judgment will be made, and then repeated every 2 minutes.

[0087] S302, determine if t0-ta>4℃ is satisfied. If yes, execute S302; otherwise, execute S302.

[0088] At this time, the ambient temperature is much lower than the set temperature, so the heat needs to be increased.

[0089] S303, determine if tp-tc > 3℃. If yes, proceed to S304; otherwise, proceed to S305.

[0090] S304, indoor unit speed increased by 50 rpm. The fins still retain residual heat, so the indoor unit speed is increased by 50 rpm to increase airflow and remove the heat.

[0091] S305, compressor frequency increased by 2 Hz. The fin heat exchange is nearing its limit, hence the 2 Hz increase in compressor frequency.

[0092] S306, determine if |ta-t0|≤4℃ is satisfied. If yes, proceed to S307; otherwise, proceed to S312. At this point, the difference between the ambient temperature and the set temperature is small, and it is only necessary to maintain a stable room temperature.

[0093] S307, determine if tp-tc > 5℃. If yes, proceed to S308; otherwise, proceed to S309.

[0094] S308, frequency reduced by 2 Hz. There is a large amount of residual heat on the fins, hence the 2 Hz frequency reduction.

[0095] S309, determine if tp-tc≥3℃ is satisfied. If yes, proceed to S310; otherwise, proceed to S311.

[0096] S310, do not perform any action.

[0097] S311, indoor unit speed decreases by 50 r / min. The finned heat exchange temperature difference is small, deviating from the optimal temperature difference, i.e., the air volume is too high. The indoor unit speed decreases by 50 r / min to ensure heat output while reducing power consumption.

[0098] S312, determine if tp-tc > 3℃. If yes, proceed to S313; otherwise, proceed to S314.

[0099] S313, frequency reduced by 2 Hz. The indoor air temperature is much higher than the set temperature, and the fin heat exchange temperature difference is too large, that is, the fin temperature stores too much heat, so the frequency is reduced by 2 Hz.

[0100] S314, indoor unit speed reduced by 100 r / min. The indoor air temperature is much higher than the set temperature, while the fin heat exchange temperature difference is too small, so the indoor unit speed is reduced by 100 r / min.

[0101] The embodiments of the present invention can extract the heat exchange status from the temperature at the fin tip, and control and judge by the temperature at the fin tip and the outlet air temperature, thereby accurately controlling the heat exchange demand and power.

[0102] Figure 4 A schematic diagram of a control device for an air conditioner according to an embodiment of the present invention is shown. The device includes:

[0103] The acquisition module 401 is used to acquire the first difference between the indoor ambient temperature and the air conditioner set temperature after the air conditioner has been running for a preset time.

[0104] The adjustment module 402 is used to, if the air conditioner is running in cooling mode, and the first difference is greater than the first temperature difference threshold and the indoor ambient temperature is greater than the air conditioner's set temperature, increase the indoor unit speed if the second difference between the fin temperature and the indoor unit's outlet air temperature is greater than the first heat exchange threshold; and increase the compressor frequency if the second difference is less than or equal to the first heat exchange threshold.

[0105] If the first difference is less than the first temperature difference threshold, and the second difference is greater than the second heat exchange threshold, then the compressor frequency is reduced; if the second difference is less than or equal to the second heat exchange threshold and greater than or equal to the third heat exchange threshold, then the current compressor frequency and indoor unit speed are maintained; if the second difference is less than the third heat exchange threshold, then the indoor unit speed is reduced.

[0106] If the first difference is greater than the first temperature difference threshold and the indoor ambient temperature is less than the air conditioner set temperature, and the second difference is greater than the fourth heat exchange threshold, then the compressor frequency is reduced; if the second difference is less than or equal to the fourth heat exchange threshold, then the indoor unit speed is reduced.

[0107] As a feasible approach, the adjustment module is further configured to: if the air conditioner is operating in heating mode, and the first difference is greater than a second temperature difference threshold and the indoor ambient temperature is less than the air conditioner's set temperature, if the second difference is greater than a fifth heat exchange threshold, increase the indoor unit speed; if the second difference is less than or equal to the fifth heat exchange threshold, increase the compressor frequency; if the first difference is less than the second temperature difference threshold, and the second difference is greater than a sixth heat exchange threshold, decrease the compressor frequency; if the second difference is less than or equal to the sixth heat exchange threshold and greater than or equal to a seventh heat exchange threshold, maintain the current compressor frequency and indoor unit speed; if the second difference is less than the seventh heat exchange threshold, decrease the indoor unit speed; if the first difference is greater than the second temperature difference threshold and the indoor ambient temperature is greater than the air conditioner's set temperature, and the second difference is greater than an eighth heat exchange threshold, decrease the compressor frequency; if the second difference is less than or equal to the eighth heat exchange threshold, decrease the indoor unit speed.

[0108] The air conditioner control method provided in this embodiment of the invention can determine the cooling demand based on the difference between the indoor ambient temperature and the air conditioner set temperature, and determine the heat exchange status based on the difference between the fin temperature and the indoor unit outlet air temperature. Then, it comprehensively adjusts the compressor frequency and the indoor unit speed to accurately control the heat exchange demand and power, which can take into account the user's cooling / heating needs and energy saving.

[0109] As a possible approach, the adjustment module is further configured to: reduce the indoor unit speed if the second difference is greater than the fourth heat exchange threshold when the first difference is greater than the first temperature difference threshold and the indoor ambient temperature is less than the air conditioner set temperature; or, reduce the compressor frequency if the second difference is less than or equal to the fourth heat exchange threshold when the first difference is greater than the first temperature difference threshold and the indoor ambient temperature is less than the air conditioner set temperature.

[0110] As a possible approach, the adjustment module is further configured to: reduce the indoor unit speed if the second difference is greater than the eighth heat exchange threshold when the first difference is greater than the second temperature difference threshold and the indoor ambient temperature is greater than the air conditioner set temperature; or, reduce the compressor frequency if the second difference is less than or equal to the eighth heat exchange threshold when the first difference is greater than the second temperature difference threshold and the indoor ambient temperature is greater than the air conditioner set temperature.

[0111] As one feasible approach, the first temperature difference threshold is in the range of 2℃ to 4℃; or, the first heat exchange threshold, the second heat exchange threshold, the third heat exchange threshold, and the fourth heat exchange threshold are in the range of 3℃ to 5℃, and the third heat exchange threshold is less than the second heat exchange threshold; or, the indoor unit speed change value is in the range of 50r / min to 100r / min; or, the compressor frequency change value is in the range of 1Hz to 3Hz.

[0112] As one feasible approach, the second temperature difference threshold is in the range of 2℃ to 4℃; or, the fifth heat exchange threshold, the sixth heat exchange threshold, the seventh heat exchange threshold, and the eighth heat exchange threshold are in the range of 3℃ to 5℃, and the third heat exchange threshold is less than the second heat exchange threshold; or, the indoor unit speed change value is in the range of 50r / min to 100r / min; or, the compressor frequency change value is in the range of 1Hz to 3Hz.

[0113] As a feasible approach, the acquisition module is also used to: acquire the fin temperature by means of a sensor located at the end of the fin in the air outlet direction, and acquire the indoor unit air outlet temperature by means of a temperature sensor measuring the evaporator air outlet.

[0114] This invention provides an air conditioner, including a computer-readable storage medium storing a computer program and a processor, wherein the computer program is read and executed by the processor to implement the above-described method.

[0115] This invention also provides a computer-readable storage medium storing a computer program. When the computer program is read and executed by a processor, it implements the method provided in the above embodiments and achieves the same technical effect. To avoid repetition, further details are omitted here. The computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0116] Of course, those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by computer-controlled devices. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the above method embodiments. The storage medium can be a memory, a disk, an optical disk, etc.

[0117] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

[0118] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0119] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Regarding the control device and air conditioner disclosed in the embodiments, since they correspond to the control method of the air conditioner disclosed in the above embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0120] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A control method for an air conditioner, characterized in that, The method includes: After the air conditioner has been running for a preset period of time, the first difference between the indoor ambient temperature and the air conditioner's set temperature is obtained; If the air conditioner is operating in cooling mode, and the first difference is greater than the first temperature difference threshold and the indoor ambient temperature is greater than the air conditioner's set temperature, if the second difference between the fin temperature and the indoor unit's outlet air temperature is greater than the first heat exchange threshold, then the indoor unit's speed is increased; if the second difference is less than or equal to the first heat exchange threshold, then the compressor frequency is increased. If the first difference is less than the first temperature difference threshold, and the second difference is greater than the second heat exchange threshold, then the compressor frequency is reduced; if the second difference is less than or equal to the second heat exchange threshold and greater than or equal to the third heat exchange threshold, then the current compressor frequency and indoor unit speed are maintained; if the second difference is less than the third heat exchange threshold, then the indoor unit speed is reduced. If the first difference is greater than the first temperature difference threshold and the indoor ambient temperature is less than the air conditioner set temperature, and the second difference is greater than the fourth heat exchange threshold, then the compressor frequency is reduced; if the second difference is less than or equal to the fourth heat exchange threshold, then the indoor unit speed is reduced.

2. The method as described in claim 1, characterized in that, The method further includes: If the air conditioner is operating in heating mode, and the first difference is greater than the second temperature difference threshold and the indoor ambient temperature is less than the air conditioner's set temperature, if the second difference is greater than the fifth heat exchange threshold, then the indoor unit speed is increased; if the second difference is less than or equal to the fifth heat exchange threshold, then the compressor frequency is increased. If the first difference is less than the second temperature difference threshold, and the second difference is greater than the sixth heat exchange threshold, then the compressor frequency is reduced; if the second difference is less than or equal to the sixth heat exchange threshold and greater than or equal to the seventh heat exchange threshold, then the current compressor frequency and indoor unit speed are maintained; if the second difference is less than the seventh heat exchange threshold, then the indoor unit speed is reduced. If the first difference is greater than the second temperature difference threshold and the indoor ambient temperature is greater than the air conditioner set temperature, then if the second difference is greater than the eighth heat exchange threshold, the compressor frequency is reduced; if the second difference is less than or equal to the eighth heat exchange threshold, the indoor unit speed is reduced.

3. The method as described in claim 1, characterized in that, The method further includes: If the first difference is greater than the first temperature difference threshold and the indoor ambient temperature is less than the air conditioner's set temperature, and the second difference is greater than the fourth heat exchange threshold, then the indoor unit speed is reduced; or, If the first difference is greater than the first temperature difference threshold and the indoor ambient temperature is less than the air conditioner set temperature, and the second difference is less than or equal to the fourth heat exchange threshold, then the compressor frequency is reduced.

4. The method as described in claim 2, characterized in that, The method further includes: If the first difference is greater than the second temperature difference threshold and the indoor ambient temperature is greater than the air conditioner's set temperature, and if the second difference is greater than the eighth heat exchange threshold, then the indoor unit speed is reduced; or, If the first difference is greater than the second temperature difference threshold and the indoor ambient temperature is greater than the air conditioner set temperature, and the second difference is less than or equal to the eighth heat exchange threshold, then the compressor frequency is reduced.

5. The method as described in claims 1 and 3, characterized in that, The first temperature difference threshold ranges from 2℃ to 4℃; or, The first heat exchange threshold, the second heat exchange threshold, the third heat exchange threshold, and the fourth heat exchange threshold are all within the range of 3℃ to 5℃, and the third heat exchange threshold is less than the second heat exchange threshold; or, The range of indoor unit speed change is 50 r / min to 100 r / min; or, The range of compressor frequency change is 1 Hz to 3 Hz.

6. The method as described in claims 2 and 4, characterized in that, The second temperature difference threshold ranges from 2℃ to 4℃; or, The values ​​of the fifth, sixth, seventh, and eighth heat exchange thresholds are in the range of 3℃ to 5℃, and the third heat exchange threshold is less than the second heat exchange threshold; or, The range of indoor unit speed change is 50 r / min to 100 r / min; or, The range of compressor frequency change is 1 Hz to 3 Hz.

7. The method as described in claim 1, characterized in that, The method further includes: The fin temperature is obtained by a sensor located at the end of the fin in the air outlet direction, and the air outlet temperature of the indoor unit is obtained by a temperature sensor measuring the air outlet of the evaporator.

8. A control device for an air conditioner, characterized in that, The device includes: The acquisition module is used to acquire the first difference between the indoor ambient temperature and the air conditioner's set temperature after the air conditioner has been running for a preset period of time. The adjustment module is configured to, when the air conditioner is operating in cooling mode, and the first difference is greater than a first temperature difference threshold and the indoor ambient temperature is greater than the air conditioner's set temperature, increase the indoor unit speed if the second difference between the fin temperature and the indoor unit's outlet air temperature is greater than a first heat exchange threshold; increase the compressor frequency if the second difference is less than or equal to the first heat exchange threshold; decrease the compressor frequency if the second difference is greater than a second heat exchange threshold when the first difference is less than the first temperature difference threshold; maintain the current compressor frequency and indoor unit speed if the second difference is less than or equal to the second heat exchange threshold and greater than or equal to a third heat exchange threshold; and decrease the indoor unit speed if the second difference is less than the third heat exchange threshold. If the first difference is greater than the first temperature difference threshold and the indoor ambient temperature is less than the air conditioner set temperature, and the second difference is greater than the fourth heat exchange threshold, then the compressor frequency is reduced; if the second difference is less than or equal to the fourth heat exchange threshold, then the indoor unit speed is reduced.

9. An air conditioner, characterized in that, The method includes a computer-readable storage medium storing a computer program, which is read and executed by the processor to implement the method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when read and executed by a processor, implements the method as described in any one of claims 1-7.

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