An air conditioner and a control method, device and readable storage medium thereof

Abstract

This invention provides an air conditioner and its control method, apparatus, and readable storage medium. The control method includes: acquiring the inner ring temperature, evaporator coil temperature, evaporator fan speed, evaporator fan current, condenser fan speed, condenser fan current, and water pump current; determining whether to enter a refrigerant shortage protection state based on the inner ring temperature, evaporator coil temperature, evaporator fan speed, and condenser fan speed; and when the determination is yes, determining whether the air conditioner is low on refrigerant based on the evaporator fan current, condenser fan current, and water pump current. The problem solved by this invention is that the technical solutions in related technologies cannot accurately determine whether an air conditioner is low on refrigerant.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to an air conditioner, a control method and device thereof, and a readable storage medium. BACKGROUND

[0002] Currently, the common fluorine deficiency protection logic of the fixed frequency air conditioning system is to determine whether the air conditioner is fluorine deficient through the change or difference of the evaporator tube temperature, the environment temperature, the system current, the compressor discharge temperature, and the mass flow rate, but in specific cases, such as the system refrigerant amount is originally small and the evaporator tube temperature position is not reasonably set, the misprotection or protection delay may occur.

[0003] Therefore, the technical scheme in the related art cannot accurately determine whether the air conditioner is fluorine deficient. SUMMARY

[0004] The present application solves the problem that the technical scheme in the related art cannot accurately determine whether the air conditioner is fluorine deficient.

[0005] To solve the above problems, the first object of the present application is to provide a control method of an air conditioner.

[0006] The second object of the present application is to provide a control device of an air conditioner.

[0007] The third object of the present application is to provide an air conditioner.

[0008] The fourth object of the present application is to provide a readable storage medium.

[0009] To achieve the first object of the present application, the embodiments of the present application provide a control method of an air conditioner, which comprises: acquiring an inner ring temperature, an evaporator coil temperature, an evaporator fan speed, an evaporator fan current, a condenser fan speed, a condenser fan current, and a water chopper current; determining whether to enter a fluorine deficiency protection determination according to the inner ring temperature, the evaporator coil temperature, the evaporator fan speed, and the condenser fan speed; and when the determination is yes, determining whether the air conditioner is fluorine deficient according to the evaporator fan current, the condenser fan current, and the water chopper current.

[0010] Compared with the prior art, the technical effects achieved by the technical scheme are: the scheme of the present embodiment can accurately determine whether the air conditioner is in a fluorine deficiency state, thereby effectively improving the reliability of the air conditioner in use.

[0011] In an embodiment of the present application, the control method is executed when the air conditioner operates in a cooling mode.

[0012] In one embodiment of the present invention, acquiring the inner ring temperature, evaporator coil temperature, evaporator fan speed, evaporator fan current, condenser fan speed, condenser fan current, and water pump current includes: acquiring a first inner ring temperature when the air conditioner is turned on; acquiring a first evaporator fan speed, a first evaporator fan current, a first condenser fan speed, a first condenser fan current, and a first water pump current after the air conditioner is turned on for a first time threshold; and acquiring a second inner ring temperature, evaporator coil temperature, a second evaporator fan speed, a second evaporator fan current, a second condenser fan speed, a second condenser fan current, and a second water pump current after the compressor is running for a second time threshold.

[0013] Compared with the prior art, the technical effect achieved by adopting this technical solution is that the solution of this embodiment can accurately acquire relevant data, thereby improving the accuracy and reliability of the control method of the present invention.

[0014] In one embodiment of the present invention, determining whether to enter the refrigerant shortage protection judgment based on the inner ring temperature, evaporator coil temperature, evaporator fan speed, and condenser fan speed includes: subtracting the evaporator coil temperature from the first inner ring temperature to determine a first difference; subtracting the evaporator coil temperature from the second inner ring temperature to determine a second difference; determining whether the air conditioner meets a first condition based on the first difference and the second difference; if the first condition is met, determining whether the air conditioner meets a second condition based on the second evaporator fan speed; if the second condition is met, determining whether to enter the refrigerant shortage protection judgment based on the first evaporator fan speed, the first condenser fan speed, the second evaporator fan speed, and the second condenser fan speed.

[0015] Compared with the prior art, the technical effect achieved by adopting this technical solution is that, through multiple condition judgments, the cooling status of the air conditioner can be determined more accurately, and the possibility of refrigerant shortage in the air conditioner can be preliminarily determined, thereby improving the reliability and accuracy of the control method of the present invention.

[0016] In one embodiment of the present invention, determining whether an air conditioner meets a first condition based on a first difference and a second difference includes: determining that the air conditioner meets the first condition when the first difference is less than or equal to a first temperature threshold and the second difference is less than or equal to a second temperature threshold.

[0017] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the solution of this embodiment can preliminarily determine that the air conditioner has poor cooling effect, thereby improving the reliability of the control method of the present invention.

[0018] In one embodiment of the present invention, if the first condition is met, determining whether the air conditioner meets the second condition based on the second evaporator fan speed includes: if the first condition is met, when the second evaporator fan speed is less than or equal to a low speed threshold and the duration is greater than or equal to a third time threshold, determining that the air conditioner meets the second condition.

[0019] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the solution of this embodiment can more accurately determine the current state of the air conditioner by further determination, which effectively improves the reliability of the control method of the present invention.

[0020] In one embodiment of the present invention, when the second condition is met, determining whether to enter the refrigerant shortage protection determination based on the speed of the first evaporator fan, the speed of the first condenser fan, the speed of the second evaporator fan, and the speed of the second condenser fan includes: when the second condition is met, if the speed of the first evaporator fan is the same as the speed of the second evaporator fan, and the speed of the first condenser fan is the same as the speed of the second condenser fan, determining that it is necessary to enter the refrigerant shortage protection determination; when the speed of the first evaporator fan is different from the speed of the second evaporator fan, or the speed of the first condenser fan is different from the speed of the second condenser fan, controlling the speed of the evaporator fan to be the speed of the first evaporator fan and the speed of the condenser fan to be the speed of the first condenser fan for a fourth time threshold, and then executing the control method again.

[0021] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: The solution of this embodiment can effectively eliminate the situation where the measured current value is different due to the different windshields of the evaporator fan and the condenser fan, thereby effectively increasing the accuracy of the control method of the present invention.

[0022] In one embodiment of the present invention, when the second condition is not met, the evaporator fan speed is controlled to be less than or equal to the low speed threshold operating time threshold, and then the determination of the first condition is re-executed.

[0023] Compared with the prior art, the technical effect achieved by adopting this technical solution is that the solution of this embodiment further improves the reliability of the control method of the present invention.

[0024] In one embodiment of the present invention, when the determination is yes, the air conditioner is judged to be low on refrigerant based on the evaporator fan current, condenser fan current, and water pump current, including: subtracting the first evaporator fan current from the second evaporator fan current to determine a third difference; subtracting the first condenser fan current from the second condenser fan current to determine a fourth difference; subtracting the first water pump current from the second water pump current to determine a fifth difference; when the third difference is less than or equal to a first current threshold, the air conditioner is judged to be low on refrigerant; when the third difference is greater than the first current threshold, the air conditioner is judged to be low on refrigerant based on the fourth and fifth differences.

[0025] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: The solution of this embodiment can accurately determine whether the air conditioner is low on refrigerant, and when uncertain, it can make further judgments; the solution of this embodiment effectively improves the accuracy of determining whether the air conditioner is low on refrigerant.

[0026] In one embodiment of the present invention, when the third difference is greater than the first current threshold, the air conditioner is determined to be short of refrigerant based on the fourth difference and the fifth difference, including: when the fourth difference is less than the second current threshold and the fifth difference is less than the third current threshold, the air conditioner is determined to be short of refrigerant.

[0027] Compared with the prior art, the technical effect achieved by adopting this technical solution is that the solution of this embodiment can further accurately determine whether the air conditioner is low on refrigerant, thereby effectively improving the reliability of the control method of the present invention.

[0028] To achieve the second objective of this invention, an embodiment of this invention provides a control device for an air conditioner. The control device includes: a detection module for acquiring the inner ring temperature, evaporator coil temperature, evaporator fan speed, evaporator fan current, condenser fan speed, condenser fan current, and water pump current; a first judgment module for determining whether it is necessary to enter the refrigerant shortage protection judgment based on the inner ring temperature, evaporator coil temperature, evaporator fan speed, and condenser fan speed; and a second judgment module for determining whether the air conditioner is low on refrigerant based on the evaporator fan current, condenser fan current, and water pump current when the judgment is yes.

[0029] The control device of the air conditioner in the embodiments of the present invention implements the steps of the control method of the air conditioner as in any embodiment of the present invention, and thus has all the beneficial effects of the control method of the air conditioner as in any embodiment of the present invention, which will not be repeated here.

[0030] To achieve the third objective of the present invention, an embodiment of the present invention provides an air conditioner, which includes: a processor, a memory, and a program or instructions stored in the memory and executable on the processor. When the program or instructions are executed by the processor, they implement the steps of the control method of the air conditioner as described in any embodiment of the present invention.

[0031] The air conditioner of the present invention implements the steps of the control method of the air conditioner as described in any embodiment of the present invention, and therefore has all the beneficial effects of the control method of the air conditioner as described in any embodiment of the present invention, which will not be repeated here.

[0032] To achieve the fourth objective of the present invention, embodiments of the present invention provide a readable storage medium on which a program or instructions are stored, which, when executed by a processor, implement the steps of the control method for an air conditioner as described in any embodiment of the present invention.

[0033] The readable storage medium of this invention implements the steps of the air conditioner control method of any embodiment of this invention, and thus has all the beneficial effects of the air conditioner control method of any embodiment of this invention, which will not be repeated here. Attached Figure Description

[0034] Figure 1 This is a flowchart illustrating the steps of an air conditioner control method according to some embodiments of the present invention. Detailed Implementation

[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0036] See Figure 1 This embodiment provides a control method for an air conditioner, the control method including:

[0037] S100: Obtains inner ring temperature, evaporator coil temperature, evaporator fan speed, evaporator fan current, condenser fan speed, condenser fan current, and water pump current;

[0038] S200: Determine whether to enter the refrigerant shortage protection judgment based on the inner ring temperature, evaporator coil temperature, evaporator fan speed and condenser fan speed;

[0039] S300: When the judgment is yes, determine whether the air conditioner is low on refrigerant based on the evaporator fan current, condenser fan current and water pump current.

[0040] It should be noted that, preferably, the solution in this embodiment is applicable to portable air conditioners; the inner ring temperature refers to the indoor ambient temperature; when the air conditioner is running normally, the evaporator will produce condensate that adheres to the evaporator fins. At this time, the load on the evaporator fan increases and the operating current increases. When the portable air conditioner is cooling, the condensate will be collected in the chassis, and then the water pump motor will throw the condensate onto the condenser to cool it down. This process will increase the load on the condenser fan and the water pump motor. The water pump motor current refers to the operating current of the water pump motor.

[0041] Furthermore, in S200, the cooling or heating capacity of the air conditioner can be determined based on the inner ring temperature, evaporator coil temperature, evaporator fan speed and condenser fan speed, and a preliminary judgment can be made as to whether the air conditioner needs to enter the refrigerant shortage protection judgment. When it is determined that the air conditioner may be short of refrigerant, the judgment is entered into S300.

[0042] Furthermore, in the S300, the specific operating conditions of the air conditioner can be determined more accurately based on the evaporator fan current, condenser fan current, and water pump current, thereby more accurately determining whether the air conditioner is low on refrigerant.

[0043] Understandably, the solution in this embodiment can accurately determine whether the air conditioner is in a refrigerant shortage state, thereby effectively improving the reliability of the air conditioner during use.

[0044] Furthermore, in one specific embodiment, the control method is executed when the air conditioner is operating in cooling mode.

[0045] Furthermore, in a specific embodiment, acquiring the inner ring temperature, evaporator coil temperature, evaporator fan speed, evaporator fan current, condenser fan speed, condenser fan current, and water pump current includes:

[0046] When the air conditioner is turned on, the temperature of the first inner ring is obtained;

[0047] After the air conditioner is turned on and the first time threshold is reached, the speed of the first evaporator fan, the current of the first evaporator fan, the speed of the first condenser fan, the current of the first condenser fan, and the current of the first water pump are obtained.

[0048] After the compressor operates for the second time threshold, the second inner ring temperature, evaporator coil temperature, second evaporator fan speed, second evaporator fan current, second condenser fan speed, second condenser fan current, and second water pump current are obtained.

[0049] Preferably, the first time threshold is 30 seconds; the second time threshold is 5 minutes.

[0050] In this embodiment, when the air conditioner is turned on, the first inner ring temperature is obtained; that is, the indoor ambient temperature when the air conditioner is turned on is recorded.

[0051] Furthermore, after the first time threshold of the air conditioner is turned on, the speed of the first evaporator fan, the current of the first evaporator fan, the speed of the first condenser fan, the current of the first condenser fan, and the current of the first water pump are acquired. When the air conditioner is turned on, the evaporator fan and the condenser fan will start working immediately. After the first time threshold of the air conditioner is turned on, after the evaporator fan and the condenser fan have run to a stable state, the corresponding fan speed and fan current are detected, and accurate data can be obtained.

[0052] Furthermore, after the compressor operates for the second time threshold, the second inner ring temperature, evaporator coil temperature, second evaporator fan speed, second evaporator fan current, second condenser fan speed, second condenser fan current, and second water pump current are acquired. After the air conditioner is turned on, the compressor will be turned on after a certain delay. By detecting the relevant speed, temperature, and current after the compressor operates for the second time threshold, more stable and accurate data can be obtained.

[0053] Understandably, the solution in this embodiment can accurately acquire relevant data, thereby improving the accuracy and reliability of the control method of the present invention.

[0054] Furthermore, in a specific embodiment, the determination of whether to enter the refrigerant shortage protection state is based on the inner ring temperature, evaporator coil temperature, evaporator fan speed, and condenser fan speed, including:

[0055] Subtract the evaporator coil temperature from the first inner ring temperature to determine the first difference;

[0056] The second difference is determined by subtracting the evaporator coil temperature from the second inner ring temperature.

[0057] Based on the first difference and the second difference, determine whether the air conditioner meets the first condition;

[0058] If the first condition is met, determine whether the air conditioner meets the second condition based on the speed of the second evaporator fan.

[0059] If the second condition is met, determine whether it is necessary to enter the refrigerant shortage protection judgment based on the speed of the first evaporator fan, the speed of the first condenser fan, the speed of the second evaporator fan, and the speed of the second condenser fan.

[0060] Understandably, by making multiple condition determinations, the cooling status of the air conditioner can be determined more accurately, and it can be preliminarily determined whether the air conditioner is short of refrigerant, thereby improving the reliability and accuracy of the control method of the present invention.

[0061] Further, in a specific embodiment, determining whether the air conditioner meets the first condition based on the first difference and the second difference includes:

[0062] When the first difference is less than or equal to the first temperature threshold and the second difference is less than or equal to the second temperature threshold, the air conditioner is determined to meet the first condition.

[0063] Preferably, the first temperature threshold is 2 degrees Celsius; the second temperature threshold is 1 degree Celsius.

[0064] It should be noted that under normal cooling operation, the evaporator coil temperature of an air conditioner is relatively low, and cooling is achieved by continuously evaporating and absorbing heat through the evaporator.

[0065] In this embodiment, when the first difference is less than or equal to the first temperature threshold and the second difference is less than or equal to the second temperature threshold, it indicates that the air conditioner has a poor cooling effect, and the air conditioner is judged to meet the first condition.

[0066] Understandably, the solution in this embodiment can be used to preliminarily determine that the air conditioner has poor cooling effect, thereby improving the reliability of the control method of the present invention.

[0067] Furthermore, in a specific embodiment, if the first condition is met, determining whether the air conditioner meets the second condition based on the second evaporator fan speed includes:

[0068] If the first condition is met, the air conditioner is deemed to meet the second condition when the speed of the second evaporator fan is less than or equal to the low speed threshold and the duration is greater than or equal to the third time threshold.

[0069] Preferably, the third time threshold is set to 1 minute.

[0070] In this embodiment, when the second evaporator fan speed is less than or equal to the low speed threshold and the duration is greater than or equal to the third time threshold, it indicates that the evaporator fan is in a low fan speed state, and the air conditioner is judged to meet the second condition. If the evaporator fan is in a low fan speed state under the premise of meeting the first condition, it indicates that the evaporator cooling effect is poor and the heat absorption efficiency is low. At this time, it can be further judged that the air conditioner may be in a refrigerant shortage state.

[0071] Understandably, the solution in this embodiment, through further determination, can more accurately determine the current state of the air conditioner, effectively improving the reliability of the control method of the present invention.

[0072] Furthermore, in a specific embodiment, when the second condition is met, based on the speed of the first evaporator fan, the speed of the first condenser fan, the speed of the second evaporator fan, and the speed of the second condenser fan, it is determined whether to enter the refrigerant shortage protection determination, including:

[0073] If the second condition is met, and the speed of the first evaporator fan is the same as that of the second evaporator fan, and the speed of the first condenser fan is the same as that of the second condenser fan, it is determined that the refrigerant shortage protection judgment needs to be entered.

[0074] When the speed of the first evaporator fan is different from that of the second evaporator fan, or the speed of the first condenser fan is different from that of the second condenser fan, the control method is executed again after the evaporator fan speed is controlled to be the same as that of the first evaporator fan and the condenser fan speed is the same as that of the first condenser fan, and the control method is executed again after the fourth time threshold is reached.

[0075] Preferably, the fourth time threshold is 5 minutes.

[0076] In this embodiment, when the second condition is met, and the speeds of the first evaporator fan and the second evaporator fan are the same, and the speeds of the first condenser fan and the second condenser fan are the same, it is determined that a refrigerant shortage protection judgment needs to be entered. That is, subsequent judgments are made based on the evaporator fan current, condenser fan current, and water pump current to determine whether the air conditioner is low on refrigerant. Since subsequent judgments are made based on the evaporator fan current and condenser fan current, it is necessary to control variables when acquiring data to ensure that the evaporator fan and condenser fan are at the same fan speed. The data acquired at this time can further improve the accuracy of the control method.

[0077] Furthermore, when the speed of the first evaporator fan differs from that of the second evaporator fan, or when the speed of the first condenser fan differs from that of the second condenser fan, the control method is executed again after the evaporator fan speed is set to the speed of the first evaporator fan and the condenser fan speed is set to the speed of the first condenser fan for a fourth time threshold. It should be noted that when the fan speeds measured twice are different, it is necessary to control the evaporator fan speed to the speed of the first evaporator fan and the condenser fan speed to the speed of the first condenser fan for a fourth time threshold. Then, the inner ring temperature, evaporator coil temperature, evaporator fan speed, evaporator fan current, condenser fan speed, condenser fan current, and water pump current are re-detected and acquired. The data obtained at this time are named the second inner ring temperature, evaporator coil temperature, second evaporator fan speed, second evaporator fan current, second condenser fan speed, second condenser fan current, and second water pump current, respectively, and the control method is executed again based on the above.

[0078] Understandably, the solution in this embodiment can effectively eliminate the situation where the measured current values ​​are different due to the different windshields of the evaporator fan and the condenser fan, thereby effectively increasing the accuracy of the control method of the present invention.

[0079] Furthermore, in a specific embodiment, when the second condition is not met, after controlling the evaporator fan speed to be less than or equal to the low speed threshold for the fifth time threshold, the determination of the first condition is re-executed.

[0080] Preferably, the fifth time threshold is 3 minutes.

[0081] In this embodiment, when the second condition is not met, the evaporator fan speed is controlled to be less than or equal to the low speed threshold for the fifth time threshold, and then the determination of the first condition is re-executed; the determination of the first and second conditions can only be accurately performed when the evaporator fan speed is at the low speed setting.

[0082] Understandably, the solution in this embodiment further improves the reliability of the control method of the present invention.

[0083] Furthermore, in a specific embodiment, when the determination is yes, the air conditioner is judged to be low on refrigerant based on the evaporator fan current, condenser fan current, and water pump current, including:

[0084] Subtract the current of the first evaporator fan from the current of the second evaporator fan to determine the third difference;

[0085] Subtract the first condenser fan current from the second condenser fan current to determine the fourth difference;

[0086] Subtract the current of the first water pump from the current of the second water pump to determine the fifth difference;

[0087] When the third difference is less than or equal to the first current threshold, the air conditioner is determined to be short of refrigerant.

[0088] When the third difference is greater than the first current threshold, the air conditioner is judged to be short of refrigerant based on the fourth and fifth differences.

[0089] Preferably, the first current threshold is 0.1A.

[0090] It should be noted that during normal operation of the refrigeration system, condensate will be produced on the evaporator fins, increasing the load on the upper fan and the operating current. When the portable air conditioner is running in cooling mode, the condensate will be collected in the chassis and then the water pump motor will spray it onto the condenser to cool it down. This process will increase the load on the lower fan. When the water pump motor is pumping water (operating under load), the operating current will increase.

[0091] In this embodiment, when the third difference is less than or equal to the first current threshold, it indicates that the evaporator fan current has not increased significantly, the air conditioner's cooling effect is extremely poor, and the evaporator produces almost no condensate. At this time, it can be determined that the air conditioner is short of refrigerant and the air conditioner will stop.

[0092] Furthermore, when the third difference is greater than the first current threshold, it indicates that the cooling effect is relatively good. The fourth and fifth differences are then used to further determine whether the air conditioner is low on refrigerant.

[0093] Understandably, the solution in this embodiment can accurately determine whether an air conditioner is low on refrigerant, and when uncertain, it can make further judgments. The solution in this embodiment effectively improves the accuracy of determining whether an air conditioner is low on refrigerant.

[0094] Furthermore, in a specific embodiment, when the third difference is greater than the first current threshold, the air conditioner is determined to be low on refrigerant based on the fourth and fifth differences, including:

[0095] When the fourth difference is less than the second current threshold and the fifth difference is less than the third current threshold, the air conditioner is judged to be low on refrigerant.

[0096] Preferably, the second current threshold is 0.15A; the third current threshold is 0.05A.

[0097] In this embodiment, when the fourth difference is less than the second current threshold and the fifth difference is less than the third current threshold, it indicates that the water output from the chassis is not high, the water pump motor pumps less condensate onto the condenser, and the air conditioner's cooling effect is poor. At this time, it can be determined that the air conditioner is low on refrigerant.

[0098] Understandably, the solution in this embodiment can further accurately determine whether the air conditioner is low on refrigerant, thereby effectively improving the reliability of the control method of the present invention.

[0099] Furthermore, this embodiment provides a control device for an air conditioner, comprising: a detection module for acquiring the inner ring temperature, evaporator coil temperature, evaporator fan speed, evaporator fan current, condenser fan speed, condenser fan current, and water pump current; a first judgment module for determining whether it is necessary to enter the refrigerant shortage protection judgment based on the inner ring temperature, evaporator coil temperature, evaporator fan speed, and condenser fan speed; and a second judgment module for determining whether the air conditioner is low on refrigerant based on the evaporator fan current, condenser fan current, and water pump current when the judgment is yes.

[0100] The control device of the air conditioner in the embodiments of the present invention implements the steps of the control method of the air conditioner as in any embodiment of the present invention, and thus has all the beneficial effects of the control method of the air conditioner as in any embodiment of the present invention, which will not be repeated here.

[0101] Furthermore, this embodiment provides an air conditioner, which includes: a processor, a memory, and a program or instructions stored in the memory and executable on the processor. When the program or instructions are executed by the processor, they implement the steps of the control method of the air conditioner as described in any embodiment of the present invention.

[0102] The air conditioner of the present invention implements the steps of the control method of the air conditioner as described in any embodiment of the present invention, and therefore has all the beneficial effects of the control method of the air conditioner as described in any embodiment of the present invention, which will not be repeated here.

[0103] Furthermore, this embodiment provides a readable storage medium on which a program or instructions are stored. When the program or instructions are executed by a processor, they implement the steps of the air conditioner control method as described in any embodiment of the present invention.

[0104] The readable storage medium of this invention implements the steps of the air conditioner control method of any embodiment of this invention, and thus has all the beneficial effects of the air conditioner control method of any embodiment of this invention, which will not be repeated here.

[0105] 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 control method includes: Obtain the inner ring temperature, evaporator coil temperature, evaporator fan speed, evaporator fan current, condenser fan speed, condenser fan current, and water pump current; Based on the inner ring temperature, the evaporator coil temperature, the evaporator fan speed, and the condenser fan speed, determine whether it is necessary to enter the refrigerant shortage protection judgment; When the determination is yes, the air conditioner is determined to be low on refrigerant based on the evaporator fan current, the condenser fan current and the water pump current. The acquisition of the inner ring temperature, evaporator coil temperature, evaporator fan speed, evaporator fan current, condenser fan speed, condenser fan current, and water pump current includes: When the air conditioner is turned on, the first inner ring temperature is obtained; After the air conditioner is turned on for the first time threshold, the speed of the first evaporator fan, the current of the first evaporator fan, the speed of the first condenser fan, the current of the first condenser fan, and the current of the first water pump are obtained. After the compressor operates for a second time threshold, the second inner ring temperature, the evaporator coil temperature, the second evaporator fan speed, the second evaporator fan current, the second condenser fan speed, the second condenser fan current, and the second water pump current are obtained. When the determination is yes, the method of determining whether the air conditioner is low on refrigerant based on the evaporator fan current, the condenser fan current, and the water pump current includes: Subtract the first evaporator fan current from the second evaporator fan current to determine the third difference; Subtract the first condenser fan current from the second condenser fan current to determine the fourth difference; Subtract the current of the first water pump from the current of the second water pump to determine the fifth difference; When the third difference is less than or equal to the first current threshold, it is determined that the air conditioner is short of refrigerant. When the third difference is greater than the first current threshold, the air conditioner is determined to be short of refrigerant based on the fourth and fifth differences.

2. The control method according to claim 1, characterized in that, The control method is executed when the air conditioner is operating in cooling mode.

3. The control method according to claim 1, characterized in that, The step of determining whether to enter the refrigerant shortage protection state based on the inner ring temperature, the evaporator coil temperature, the evaporator fan speed, and the condenser fan speed includes: The first difference is determined by subtracting the evaporator coil temperature from the first inner ring temperature. The second difference is determined by subtracting the evaporator coil temperature from the second inner ring temperature. Based on the first difference and the second difference, it is determined whether the air conditioner meets the first condition; If the first condition is met, determine whether the air conditioner meets the second condition based on the second evaporator fan speed; If the second condition is met, it is determined whether to enter the refrigerant shortage protection determination based on the speed of the first evaporator fan, the speed of the first condenser fan, the speed of the second evaporator fan, and the speed of the second condenser fan.

4. The control method according to claim 3, characterized in that, The step of determining whether the air conditioner meets the first condition based on the first difference and the second difference includes: When the first difference is less than or equal to the first temperature threshold and the second difference is less than or equal to the second temperature threshold, it is determined that the air conditioner meets the first condition.

5. The control method according to claim 3, characterized in that, The step of determining whether the air conditioner meets the second condition based on the second evaporator fan speed when the first condition is met includes: If the first condition is met, and the second evaporator fan speed is less than or equal to a low speed threshold and the duration is greater than or equal to a third time threshold, then the air conditioner is determined to meet the second condition.

6. The control method according to claim 3, characterized in that, When the second condition is met, the determination of whether to enter the refrigerant shortage protection process is based on the speed of the first evaporator fan, the speed of the first condenser fan, the speed of the second evaporator fan, and the speed of the second condenser fan, including: When the second condition is met, and the speed of the first evaporator fan is the same as the speed of the second evaporator fan, and the speed of the first condenser fan is the same as the speed of the second condenser fan, it is determined that the refrigerant shortage protection determination needs to be entered. When the speed of the first evaporator fan is different from that of the second evaporator fan, or when the speed of the first condenser fan is different from that of the second condenser fan, the control method is executed again after the speed of the evaporator fan is controlled to be the speed of the first evaporator fan and the speed of the condenser fan is controlled to be the speed of the first condenser fan for a fourth time threshold.

7. The control method according to claim 5, characterized in that, If the second condition is not met, the evaporator fan speed is controlled to be less than or equal to the low speed threshold operating time threshold, and then the determination of the first condition is re-executed.

8. The control method according to claim 1, characterized in that, When the third difference is greater than the first current threshold, determining whether the air conditioner is low on refrigerant based on the fourth and fifth differences includes: When the fourth difference is less than the second current threshold and the fifth difference is less than the third current threshold, the air conditioner is determined to be short of refrigerant.

9. A control device for an air conditioner, characterized in that, The control device, capable of applying the control method as described in any one of claims 1 to 8, comprises: The detection module is used to acquire the inner ring temperature, evaporator coil temperature, evaporator fan speed, evaporator fan current, condenser fan speed, condenser fan current, and water pump current. The first judgment module is used to determine whether it is necessary to enter the refrigerant shortage protection judgment based on the inner ring temperature, the evaporator coil temperature, the evaporator fan speed and the condenser fan speed. The second judgment module is used to determine whether the air conditioner is low on refrigerant based on the evaporator fan current, the condenser fan current and the water pump current when the judgment is yes.

10. An air conditioner, characterized in that, The air conditioner includes: a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the control method as described in any one of claims 1 to 8.

11. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the control method as described in any one of claims 1 to 8.

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