Method and apparatus for controlling rotating speed of variable-frequency compressor of air conditioner

Abstract

The present application relates to the technical field of intelligent electric appliances, and provides a method and apparatus for controlling the rotating speed of a variable-frequency compressor of an air conditioner. The method comprises: acquiring a temperature control signal input by a temperature controller and used for representing the mode state of an air conditioner; determining a target mode state of the air conditioner on the basis of the temperature control signal and a preset signal combination mode conversion truth table, and determining a set temperature of the air conditioner in the target mode state, wherein the signal combination mode conversion truth table comprises multiple groups of correspondences between various signal combinations and various mode states of the air conditioner; and determining the rotating speed of a variable-frequency compressor on the basis of the target mode state and the set temperature, and on the basis of the rotating speed of the variable-frequency compressor, controlling the variable-frequency compressor to operate. The method for controlling the rotating speed of a variable-frequency compressor of an air conditioner provided by the present application can effectively improve the rotating speed control efficiency of the variable-frequency compressor, improving the operation flexibility and adjustment performance of the air conditioner, and improving user experience.

Description

Method and device for controlling speed of variable frequency compressor of air conditioner

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 2023113329637, filed on October 16, 2023, entitled “Method and device for controlling the speed of a variable frequency compressor of an air conditioner”, which is incorporated herein by reference in its entirety. Technical Field

[0003] The present application relates to the field of intelligent electrical appliance technology, and in particular to a method and device for controlling the speed of a variable frequency compressor of an air conditioner, and also to an electronic device and a non-transient computer-readable storage medium. Background Art

[0004] In recent years, with the rapid development of the economy and society, various air conditioners have become increasingly common in people's daily lives. With the increasing use of air conditioners, the control efficiency of compressor speed in different operating modes has gradually become a focus of attention.

[0005] Currently, existing air conditioners require specific temperature signals to be directly transmitted to the air conditioner control panel when operating in different modes to control the compressor and thus adjust the air conditioning system's operation. This control method has significant limitations, resulting in poor flexibility and adjustment performance.

[0006] Therefore, how to provide a more effective and flexible speed control solution for the variable frequency compressor of the air conditioner has become a difficult problem that needs to be solved urgently.

[0007] Summary of the Invention

[0008] The present application provides a method for controlling the speed of a variable frequency compressor of an air conditioner, so as to solve the defect that the speed control scheme of the variable frequency compressor of the air conditioner in the prior art has high limitations.

[0009] The present application provides a method for controlling the speed of a variable frequency compressor of an air conditioner, comprising:

[0010] Acquiring a temperature control signal input from a thermostat for representing a mode state of the air conditioner;

[0011] Determining a target mode state of the air conditioner and a set temperature of the air conditioner in the target mode state based on the temperature control signal and a preset signal combination mode conversion truth table; wherein the signal combination mode conversion truth table includes a plurality of corresponding sets of mapping relationships between various signal combinations and various mode states of the air conditioner;

[0012] The speed of the inverter compressor is determined based on the target mode state and the set temperature, and the operation of the inverter compressor is controlled based on the speed of the inverter compressor.

[0013] Furthermore, the temperature control signal includes a status identifier of the compressor operation, a status identifier of the four-way valve control, a status identifier of the electric heating operation, and a status identifier of the fan motor operation;

[0014] The step of determining the target mode state of the air conditioner based on the temperature control signal and a preset signal combination mode conversion truth table specifically includes:

[0015] Using the temperature control signal as an index, a matching search is performed in the signal combination mode conversion truth table to obtain a target mode state corresponding to the temperature control signal; wherein, the target mode state includes the operating wind speed of the air conditioner, the on / off state of the compressor in the air conditioner and / or the operating mode state of the air conditioner; the temperature control signal includes a combination of multiple state identifiers.

[0016] Furthermore, determining the set temperature of the air conditioner in the target mode state specifically includes:

[0017] When the air conditioner is in a cooling operation mode, obtaining a current first ambient temperature, comparing the first ambient temperature with a preset first ambient temperature range, determining a first setting level and a setting temperature of the air conditioner in the cooling operation mode, and recording a corresponding second ambient temperature after the air conditioner has been operated for a preset time period based on the first setting level and the setting temperature, and when a difference between the second ambient temperature and the first ambient temperature is less than or equal to a preset first temperature threshold, lowering the first setting level to the second setting level and the setting temperature;

[0018] When the air conditioner is in the heating operation mode, the current third ambient temperature is obtained, the third ambient temperature is compared with the preset second ambient temperature range, the third setting level and the setting temperature of the air conditioner in the cooling operation mode are determined, and after running for a preset time period based on the third setting level and the setting temperature, the corresponding fourth ambient temperature is recorded. When the difference between the fourth ambient temperature and the third ambient temperature is less than or equal to the preset second temperature threshold, the third setting level is lowered to the fourth setting level and the setting temperature.

[0019] Furthermore, after recording the corresponding second ambient temperature, it also includes: when the difference between the second ambient temperature and the first ambient temperature is less than or equal to the preset first temperature threshold, controlling the operation of the compressor based on the second setting level and its set temperature; when the difference between the second ambient temperature and the first ambient temperature is greater than the preset temperature threshold, controlling the operation of the compressor based on the first setting level and its set temperature.

[0020] Furthermore, after recording the corresponding fourth ambient temperature, it also includes: when the difference between the fourth ambient temperature and the third ambient temperature is less than or equal to the preset second temperature threshold, controlling the operation of the compressor based on the fourth setting level and its set temperature; when the difference between the fourth ambient temperature and the third ambient temperature is greater than the preset second temperature threshold, controlling the operation of the compressor based on the third setting level and its set temperature.

[0021] Furthermore, determining the speed of the variable frequency compressor based on the target mode state and the set temperature specifically includes:

[0022] Determining an operating frequency corresponding to the variable frequency compressor based on the target mode state and the set temperature, and determining a speed value of the variable frequency compressor based on the operating frequency; wherein the operating frequency and speed of the variable frequency compressor are in direct proportion;

[0023] The controlling the operation of the variable frequency compressor based on the rotational speed of the variable frequency compressor specifically includes: outputting a signal of the rotational speed value of the variable frequency compressor to a corresponding inverter to control the operation of the variable frequency compressor according to the rotational speed.

[0024] Furthermore, after obtaining the temperature control signal input by the thermostat to characterize the mode state of the air conditioner, it also includes: triggering the operation of the fan motor when it is determined that the target mode state is a single air supply mode state based on the temperature control signal and a preset signal combination mode conversion truth table.

[0025] The present application also provides a variable frequency compressor speed control device for an air conditioner, comprising:

[0026] a temperature control signal acquiring unit, configured to acquire a temperature control signal inputted from a thermostat and used to represent a mode state of the air conditioner;

[0027] a set temperature determination unit, configured to determine a target mode state of the air conditioner and a set temperature of the air conditioner in the target mode state based on the temperature control signal and a preset signal combination mode conversion truth table; wherein the signal combination mode conversion truth table includes a plurality of corresponding sets of mapping relationships between various signal combinations and various mode states of the air conditioner;

[0028] The compressor speed control unit is configured to determine a speed of the variable frequency compressor based on the target mode state and the set temperature, and control the operation of the variable frequency compressor based on the speed of the variable frequency compressor.

[0029] Furthermore, the temperature control signal includes a status identifier of the compressor operation, a status identifier of the four-way valve control, a status identifier of the electric heating operation, and a status identifier of the fan motor operation;

[0030] The set temperature determination unit is specifically used to: use the temperature control signal as an index to perform a matching search in the signal combination mode conversion truth table to obtain a target mode state corresponding to the temperature control signal; wherein, the target mode state includes the operating wind speed of the air conditioner, the on / off state of the compressor in the air conditioner and / or the operating mode state of the air conditioner; the temperature control signal includes a combination of multiple state identifiers.

[0031] Furthermore, the set temperature determination unit is specifically used to:

[0032] When the air conditioner is in a cooling operation mode, obtaining a current first ambient temperature, comparing the first ambient temperature with a preset first ambient temperature range, determining a first setting level and a setting temperature of the air conditioner in the cooling operation mode, and recording a corresponding second ambient temperature after the air conditioner has been operated for a preset time period based on the first setting level and the setting temperature, and when a difference between the second ambient temperature and the first ambient temperature is less than or equal to a preset first temperature threshold, lowering the first setting level to the second setting level and the setting temperature;

[0033] When the air conditioner is in the heating operation mode, the current third ambient temperature is obtained, the third ambient temperature is compared with the preset second ambient temperature range, the third setting level and the setting temperature of the air conditioner in the cooling operation mode are determined, and after running for a preset time period based on the third setting level and the setting temperature, the corresponding fourth ambient temperature is recorded. When the difference between the fourth ambient temperature and the third ambient temperature is less than or equal to the preset second temperature threshold, the third setting level is lowered to the fourth setting level and the setting temperature.

[0034] Furthermore, after recording the corresponding second ambient temperature, the method further includes:

[0035] When the difference between the second ambient temperature and the first ambient temperature is less than or equal to the preset first temperature threshold, the operation of the compressor is controlled based on the second setting level and its set temperature; when the difference between the second ambient temperature and the first ambient temperature is greater than the preset temperature threshold, the operation of the compressor is controlled based on the first setting level and its set temperature.

[0036] Furthermore, after recording the corresponding fourth ambient temperature, the method further includes:

[0037] When the difference between the fourth ambient temperature and the third ambient temperature is less than or equal to the preset second temperature threshold, the operation of the compressor is controlled based on the fourth setting level and its set temperature; when the difference between the fourth ambient temperature and the third ambient temperature is greater than the preset second temperature threshold, the operation of the compressor is controlled based on the third setting level and its set temperature.

[0038] Furthermore, the compressor speed control unit is specifically used to:

[0039] Determining an operating frequency corresponding to the variable frequency compressor based on the target mode state and the set temperature, and determining a speed value of the variable frequency compressor based on the operating frequency; wherein the operating frequency and speed of the variable frequency compressor are in direct proportion;

[0040] The compressor speed control unit is specifically used to output a signal of the speed value of the variable frequency compressor to a corresponding frequency converter to control the variable frequency compressor to operate at the speed.

[0041] Furthermore, after obtaining the temperature control signal input by the thermostat to characterize the mode state of the air conditioner, it also includes: triggering the operation of the fan motor when it is determined that the target mode state is a single air supply mode state based on the temperature control signal and a preset signal combination mode conversion truth table.

[0042] The present application also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the variable frequency compressor speed control method for an air conditioner as described above are implemented.

[0043] The present application also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the variable frequency compressor speed control method for an air conditioner as described in any one of the above are implemented.

[0044] The present application provides a method for controlling the speed of a variable-frequency compressor in an air conditioner. This method obtains a temperature control signal input from a thermostat, representing the air conditioner's mode state, and determines the air conditioner's target mode state and set temperature for the target mode state based on the temperature control signal and a preset signal combination mode conversion truth table. Furthermore, based on the target mode state and set temperature, the speed of the variable-frequency compressor is determined, and the operation of the variable-frequency compressor is controlled based on the speed of the variable-frequency compressor. This method effectively improves the speed control efficiency of the variable-frequency compressor, enhances the flexibility and adjustability of the air conditioner's operation, and improves the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0046] FIG1 is a flow chart of a method for controlling the speed of a variable frequency compressor of an air conditioner provided by the present application;

[0047] FIG2 is a second flow chart of the method for controlling the speed of the variable frequency compressor of the air conditioner provided by the present application;

[0048] FIG3 is a flowchart of the cooling operation in the variable frequency compressor speed control method of the air conditioner provided by the present application;

[0049] FIG4 is a schematic diagram of the startup process of the air conditioner provided by the present application in the cooling operation mode;

[0050] FIG5 is a schematic diagram of the startup process of the air conditioner provided by the present application in the heating operation mode;

[0051] FIG6 is a third flow chart of the method for controlling the speed of the variable frequency compressor of the air conditioner provided by the present application;

[0052] FIG7 is a schematic structural diagram of a variable frequency compressor speed control device for an air conditioner provided by the present application;

[0053] FIG8 is a schematic structural diagram of the electronic device provided in this application. DETAILED DESCRIPTION

[0054] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0055] It should be noted that the terms "first", "second", etc. in the specification of the present application and the above-mentioned drawings are used to distinguish similar users and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0056] The following is a detailed description of an embodiment of the variable frequency compressor speed control method for an air conditioner described in this application. As shown in Figure 1, it is a flow chart of the variable frequency compressor speed control method for an air conditioner provided by this application, and the specific implementation process includes the following steps.

[0057] Step 101: Obtain a temperature control signal input from a thermostat for representing a mode state of the air conditioner.

[0058] Specifically, the temperature control signal can be a 24Vac ON / OFF signal, that is, the air conditioner uses a 24Vac ON / OFF signal as a trigger, where 24vdc is the input voltage required by the appliance, and ON and OFF represent the on and off states. In actual implementation, a 24Vac ON / OFF signal can be received and input into the control circuit. The temperature control signal includes, but is not limited to, any one or more of the compressor operation status identifiers Y1 and Y2, the four-way valve control status identifier B, the electric heating operation status identifier W1, the fan motor operation status identifier, the 24V common terminal C (AC power supply common neural), the 24V live wire R (AC power supply line), etc. Y1 can represent compressor stage 1; Y2 can represent compressor stage 2; B can represent the four-way valve control status; and W1 can represent the electric heating status. Different combinations of status identifiers correspond to different mode states.

[0059] Step 102: Based on the temperature control signal and a preset signal combination mode conversion truth table, determine the target mode state of the air conditioner and determine the set temperature of the air conditioner under the target mode state; wherein the signal combination mode conversion truth table includes multiple groups of corresponding comparison relationships between various signal combinations and various mode states of the air conditioner.

[0060] In determining the target mode state of the air conditioner based on the temperature control signal and a preset signal combination mode conversion truth table, the temperature control signal is used as an index to perform a matching search in the signal combination mode conversion truth table to obtain the target mode state corresponding to the temperature control signal. The target mode state includes the operating wind speed of the air conditioner, the on / off state of the compressor in the air conditioner, and / or the operating mode state of the air conditioner. The temperature control signal includes a combination of multiple state identifiers. For example, the signal combination mode conversion truth table may include the following: W1 is 0, Y1 is 0, Y2 is 0, and B is 0, corresponding to the operating mode state of the air conditioner being off; W1 is 0, Y1 is 0, Y2 is 0, and B is 1, corresponding to the operating mode state of the air conditioner being off; W1 is 1, Y1 is 0, Y2 is 0, and B is 0, corresponding to the operating mode state of the air conditioner being off; W1 is 1, Y1 is 0, Y2 is 0, and B is 0, corresponding to the operating mode state of the air conditioner being off; W1 is 1, Y1 is 0, Y2 is 0, and B is 1, corresponding to the operating mode state of the air conditioner being off. When W1 is 1, Y1 is 1, Y2 is 0, and B is 1, the corresponding operating mode state is air conditioner heating mode - compressor on, frequency upper limit 70% - internal electromechanical heating on; when W1 is 1, Y1 is 1, Y2 is 1, and B is 1, the corresponding operating mode state is air conditioner heating mode - compressor on, frequency upper limit 100% - internal electromechanical heating on; when W1 is 1, Y1 is 0, Y2 is 1, and B is 1, the corresponding operating mode state is air conditioner heating mode - compressor on, frequency upper limit 100% - internal electromechanical heating on. When W1 is 0, Y1 is 0, Y2 is 1, and B is 1, the corresponding operating mode is heating mode with the compressor on and a frequency cap of 100%. When W1 is 0, Y1 is 1, Y2 is 1, and B is 1, the corresponding operating mode is heating mode with the compressor on and a frequency cap of 100%. When W1 is 0, Y1 is 1, Y2 is 0, and B is 1, the corresponding operating mode is heating mode with the compressor on and a frequency cap of 70%. When W1 is 0, Y1 is 1, Y2 is 0, and B is 0, the corresponding operating mode is cooling mode with the compressor on and a frequency cap of 70%. When W1 is 0, Y1 is 1, Y2 is 1, and B is 0, the corresponding operating mode is cooling mode with the compressor on and a frequency cap of 100%. When W1 is 0, Y1 is 0, Y2 is 1, and B is 0, the corresponding operating mode is cooling mode with the compressor on and a frequency cap of 100%. If W1 is 0, Y1 is 1, Y2 is 0, and B is 0, the corresponding operating mode is the air conditioner error-stop state. If W1 is 1, Y1 is 1, Y2 is 1, and B is 0, the corresponding operating mode is the air conditioner error-stop state. If W1 is 1, Y1 is 0, Y2 is 1, and B is 0, the corresponding operating mode is the air conditioner error-stop state. Here, 0 indicates that the voltage between terminal pair C is 0V, and 1 indicates that the voltage between terminal pair C is 24V.

[0061] It should be noted that the mode state in the signal combination mode conversion truth table may also be other cooling or heating working modes, which is not specifically limited here.

[0062] As shown in Figure 2, when the air conditioner is in cooling mode, the current first ambient temperature is obtained, the first ambient temperature is compared with a preset first ambient temperature range, and the first set level and set temperature of the air conditioner in cooling mode are determined. After a preset time period based on the first set level and set temperature, the corresponding second ambient temperature is recorded. If the difference between the second ambient temperature and the first ambient temperature is less than or equal to the preset first temperature threshold, the first set level is lowered to the second set level and set temperature. Specifically, as shown in the circle in Figure 4, during the startup process, when the variable frequency compressor frequency increases, it must stay at the 50HZ, 60HZ, and 70HZ points for 30 seconds each. However, if the base target frequency is lower than one of the stop points, it only needs to stay at the previous stop point. Furthermore, when the air conditioner is in heating mode, the current third ambient temperature is obtained and compared with a preset second ambient temperature range to determine the third set level and its set temperature for cooling mode. After a preset period of operation based on the third set level and its set temperature, the corresponding fourth ambient temperature is recorded. If the difference between the fourth ambient temperature and the third ambient temperature is less than or equal to a preset second temperature threshold, the third set level is lowered to the fourth set level and its set temperature. Furthermore, if the target mode is determined to be air-only mode based on the temperature control signal and a preset signal combination mode conversion truth table, the fan motor is triggered to operate. Specifically, as shown in the circle in Figure 5 , during startup, when the variable frequency compressor frequency increases, it remains at each of the 50 Hz, 60 Hz, and 70 Hz points for 30 seconds. However, if the base target frequency falls below one of these stop points, it remains at the previous stop point only.

[0063] As shown in the Tset table below, when the air conditioner is in cooling mode, the first ambient temperature may be Tai, and the first ambient temperature range may include Tai ≤ 20°C, 20°C < Tai ≤ 25°C, and Tai > 25°C. If the first setting level and its set temperature are Tset LEVEL = 1 and Tset = Tai - 1, respectively, then the second setting level and its set temperature may be Tset LEVEL = 2 and Tset = Tai - 2, respectively. If the first setting level and its set temperature are Tset LEVEL = 2 and Tset = Tai - 2, respectively, then the second setting level and its set temperature may be Tset LEVEL = 3 and Tset = Tai - 4, respectively, without specific limitations. From Tset LEVEL = 1 to Tset LEVEL = 3, the cooling speed increases.

[0064] As shown in Figures 2 and 3, when the air conditioner is in heating mode, the third ambient temperature may be Tai, and the second ambient temperature range may also include Tai ≤ 20°C, 20°C < Tai ≤ 25°C, and Tai > 25°C. If the third setting level and its set temperature are Tset LEVEL = 1 and Tset = Tai - 1, respectively, then the fourth setting level and its set temperature may be Tset LEVEL = 2 and Tset = Tai - 2, respectively. If the third setting level and its set temperature are Tset LEVEL = 2 and Tset = Tai - 2, respectively, then the fourth setting level and its set temperature may be Tset LEVEL = 3 and Tset = Tai - 4, respectively, without specific limitation. From Tset LEVEL = 1 to Tset LEVEL = 3, the heating speed increases.

[0065] Tset table

[0066] Furthermore, after recording the corresponding second ambient temperature, the operation of the compressor may be controlled based on the second set level and its set temperature when the difference between the second ambient temperature and the first ambient temperature is less than or equal to the preset first temperature threshold; and the operation of the compressor may be controlled based on the first set level and its set temperature when the difference between the second ambient temperature and the first ambient temperature is greater than the preset temperature threshold. Furthermore, after recording the corresponding fourth ambient temperature, the operation of the compressor may be controlled based on the fourth set level and its set temperature when the difference between the fourth ambient temperature and the third ambient temperature is less than or equal to the preset second temperature threshold; and the operation of the compressor may be controlled based on the third set level and its set temperature when the difference between the fourth ambient temperature and the third ambient temperature is greater than the preset second temperature threshold.

[0067] Step 103: Determine the speed of the variable frequency compressor based on the target mode state and the set temperature, and control the operation of the variable frequency compressor based on the speed of the variable frequency compressor.

[0068] Specifically, based on the target mode state and the set temperature, the operating frequency corresponding to the variable frequency compressor can be determined through a matching selection method. The speed value of the variable frequency compressor can be determined based on the operating frequency. Then, a signal indicating the speed value of the variable frequency compressor is output to a corresponding inverter to control the variable frequency compressor to operate at the speed. The operating frequency and speed of the variable frequency compressor are directly proportional. The higher the frequency, the higher the compressor speed. The compressor speed directly affects the efficiency of the air conditioner. The inverter is a control system used to control and adjust the compressor speed, thereby improving the energy efficiency ratio.

[0069] When setting the fan speed, the desired fan speed level is selected by operating the fan speed button on the air conditioner panel. After receiving the fan speed signal, the control circuit stores the corresponding fan speed level value for subsequent control. During power on / off control, the power on / off state is selected by operating the power on / off button on the air conditioner panel. The power on / off signal is received and processed by the control circuit. During mode signal control, the air conditioner operating mode can be selected, such as cooling, heating, or air supply. The mode signal is also received and processed by the control circuit. When determining the compressor speed, the control circuit calculates the corresponding compressor speed based on the set fan speed, the power on / off state, the mode signal, the ambient temperature Tset (internal and external ambient temperatures), Pd (high pressure of the outdoor unit), PS (low pressure of the outdoor unit, compressor discharge pressure, and compressor suction pressure). This speed value can be calculated and adjusted based on known speed curves and operating parameters. For example, for an external ambient temperature of 35°C, a frequency of 40 Hz or higher is required, while for 40°C, a frequency of 60 Hz or higher is required. In the process of controlling the compressor speed, the control circuit outputs the calculated compressor speed signal to the inverter to control the operation of the compressor. Since it is impossible to directly transmit the set temperature signal, this method indirectly controls the compressor speed by setting the ambient temperature, Pd, PS, wind speed, on / off and mode. The present application can control the operating status and compressor speed of the air-conditioning system by setting other parameters without a specific set temperature signal, so as to achieve the dual goals of energy saving and comfort. Currently, it can only be done by setting the temperature signal to the air-conditioning control board, which lacks flexibility. As shown in Figure 6, the present application overcomes the limitation of not being able to transmit a specific set temperature through the variable frequency air-conditioning compressor speed control method of the 24Vac ON / OFF signal, thereby improving the flexibility of the air-conditioner variable frequency compressor control.

[0070] In addition, in this embodiment of the present application, the air conditioner can also implement shutdown control: when the air conditioner is operating in cooling or heating mode, if the variable frequency compressor receives a shutdown signal and its current frequency is greater than 55Hz (EE), the variable frequency compressor can be reduced to 48Hz at a rate of 2Hz / s and then shut down directly. If the current frequency of the variable frequency compressor is less than 55Hz, it will shut down directly upon receiving the shutdown signal. This control method can prevent excessive stress caused by sudden shutdown during high-frequency operation. The shutdown frequency point is determined based on stress. After the variable frequency compressor stops, the fan executes residual heat blowing control before shutting down.

[0071] The present application provides a method for controlling the speed of a variable-frequency compressor in an air conditioner. This method obtains a temperature control signal input from a thermostat, representing the air conditioner's mode state, and determines the air conditioner's target mode state and set temperature for the target mode state based on the temperature control signal and a preset signal combination mode conversion truth table. Furthermore, based on the target mode state and set temperature, the speed of the variable-frequency compressor is determined, and the operation of the variable-frequency compressor is controlled based on the speed of the variable-frequency compressor. This method effectively improves the speed control efficiency of the variable-frequency compressor, enhances the flexibility and adjustability of the air conditioner's operation, and improves the user experience.

[0072] The variable frequency compressor speed control device for an air conditioner provided in the present application is described below. The variable frequency compressor speed control device for an air conditioner described below and the variable frequency compressor speed control method for an air conditioner described above can be referred to in correspondence with each other.

[0073] 7, which is a schematic diagram of the structure of the variable frequency compressor speed control device for an air conditioner provided by the present application. The variable frequency compressor speed control device for an air conditioner provided by the present application specifically includes the following units.

[0074] The temperature control signal acquisition unit 701 is used to acquire a temperature control signal input from a thermostat and used to represent the mode state of the air conditioner.

[0075] The set temperature determination unit 702 is used to determine the target mode state of the air conditioner and the set temperature of the air conditioner under the target mode state based on the temperature control signal and a preset signal combination mode conversion truth table; wherein the signal combination mode conversion truth table includes multiple groups of corresponding comparison relationships between various signal combinations and various mode states of the air conditioner.

[0076] The compressor speed control unit is configured to determine a speed of the variable frequency compressor based on the target mode state and the set temperature, and control the operation of the variable frequency compressor based on the speed of the variable frequency compressor.

[0077] Furthermore, the temperature control signal includes a status identifier of the compressor operation, a status identifier of the four-way valve control, a status identifier of the electric heating operation, and a status identifier of the fan motor operation;

[0078] The set temperature determination unit is specifically used to: use the temperature control signal as an index to perform a matching search in the signal combination mode conversion truth table to obtain a target mode state corresponding to the temperature control signal; wherein, the target mode state includes the operating wind speed of the air conditioner, the on / off state of the compressor in the air conditioner and / or the operating mode state of the air conditioner; the temperature control signal includes a combination of multiple state identifiers.

[0079] Furthermore, the set temperature determination unit is specifically used to:

[0080] When the air conditioner is in a cooling operation mode, obtaining a current first ambient temperature, comparing the first ambient temperature with a preset first ambient temperature range, determining a first setting level and a setting temperature of the air conditioner in the cooling operation mode, and recording a corresponding second ambient temperature after the air conditioner has been operated for a preset time period based on the first setting level and the setting temperature, and when a difference between the second ambient temperature and the first ambient temperature is less than or equal to a preset first temperature threshold, lowering the first setting level to the second setting level and the setting temperature;

[0081] When the air conditioner is in the heating operation mode, the current third ambient temperature is obtained, the third ambient temperature is compared with the preset second ambient temperature range, the third setting level and the setting temperature of the air conditioner in the cooling operation mode are determined, and after running for a preset time period based on the third setting level and the setting temperature, the corresponding fourth ambient temperature is recorded. When the difference between the fourth ambient temperature and the third ambient temperature is less than or equal to the preset second temperature threshold, the third setting level is lowered to the fourth setting level and the setting temperature.

[0082] Furthermore, after recording the corresponding second ambient temperature, the method further includes:

[0083] When the difference between the second ambient temperature and the first ambient temperature is less than or equal to the preset first temperature threshold, the operation of the compressor is controlled based on the second setting level and its set temperature; when the difference between the second ambient temperature and the first ambient temperature is greater than the preset temperature threshold, the operation of the compressor is controlled based on the first setting level and its set temperature.

[0084] Furthermore, after recording the corresponding fourth ambient temperature, the method further includes:

[0085] When the difference between the fourth ambient temperature and the third ambient temperature is less than or equal to the preset second temperature threshold, the operation of the compressor is controlled based on the fourth setting level and its set temperature; when the difference between the fourth ambient temperature and the third ambient temperature is greater than the preset second temperature threshold, the operation of the compressor is controlled based on the third setting level and its set temperature.

[0086] Furthermore, the compressor speed control unit is specifically used to:

[0087] Determining an operating frequency corresponding to the variable frequency compressor based on the target mode state and the set temperature, and determining a speed value of the variable frequency compressor based on the operating frequency; wherein the operating frequency and speed of the variable frequency compressor are in direct proportion;

[0088] The compressor speed control unit is specifically used to output a signal of the speed value of the variable frequency compressor to a corresponding frequency converter to control the variable frequency compressor to operate at the speed.

[0089] Furthermore, after obtaining the temperature control signal input by the thermostat to characterize the mode state of the air conditioner, it also includes: triggering the operation of the fan motor when it is determined that the target mode state is a single air supply mode state based on the temperature control signal and a preset signal combination mode conversion truth table.

[0090] The variable-frequency compressor speed control device for an air conditioner provided herein obtains a temperature control signal input from a thermostat that represents the air conditioner's mode state. Based on the temperature control signal and a preset signal combination mode conversion truth table, the device determines the air conditioner's target mode state and the set temperature for the air conditioner in the target mode state. Furthermore, based on the target mode state and the set temperature, the device determines the speed of the variable-frequency compressor and controls its operation based on the speed of the variable-frequency compressor. This method effectively improves the efficiency of variable-frequency compressor speed control, enhances the flexibility and adjustability of the air conditioner's operation, and improves the user experience.

[0091] FIG8 illustrates a schematic diagram of the physical structure of an electronic device. As shown in FIG8 , the electronic device may include: a processor 801, a communication interface 804, a memory 802, and a communication bus 803, wherein the processor 801, the communication interface 804, and the memory 802 communicate with each other via the communication bus 803. The processor 801 may call logic instructions in the memory 802 to execute a method for controlling the speed of a variable-frequency compressor of an air conditioner. The method includes: obtaining a temperature control signal input from a thermostat to represent the mode state of the air conditioner; determining a target mode state of the air conditioner based on the temperature control signal and a preset signal combination mode conversion truth table, and determining a set temperature of the air conditioner in the target mode state; wherein the signal combination mode conversion truth table includes multiple sets of corresponding relationships between various signal combinations and various mode states of the air conditioner; determining the speed of the variable-frequency compressor based on the target mode state and the set temperature, and controlling the operation of the variable-frequency compressor based on the speed of the variable-frequency compressor.

[0092] In addition, the logic instructions in the above-mentioned memory 802 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0093] On the other hand, the present application also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the variable frequency compressor speed control method of the air conditioner provided by the above methods, the method including: obtaining a temperature control signal input by the thermostat for characterizing the mode state of the air conditioner; based on the temperature control signal and a preset signal combination mode conversion truth table, determining the target mode state of the air conditioner, and determining the set temperature of the air conditioner under the target mode state; wherein the signal combination mode conversion truth table contains multiple groups of corresponding comparison relationships between various signal combinations and various mode states of the air conditioner; based on the target mode state and the set temperature, determining the speed of the variable frequency compressor, and controlling the operation of the variable frequency compressor based on the speed of the variable frequency compressor.

[0094] On the other hand, the present application also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to execute the variable frequency compressor speed control method for the air conditioner provided above, the method comprising: obtaining a temperature control signal input by a thermostat for characterizing the mode state of the air conditioner; determining the target mode state of the air conditioner based on the temperature control signal and a preset signal combination mode conversion truth table, and determining the set temperature of the air conditioner under the target mode state; wherein the signal combination mode conversion truth table contains multiple groups of corresponding comparison relationships between various signal combinations and various mode states of the air conditioner; determining the speed of the variable frequency compressor based on the target mode state and the set temperature, and controlling the operation of the variable frequency compressor based on the speed of the variable frequency compressor.

[0095] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0096] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for controlling the speed of a variable frequency compressor of an air conditioner, comprising: Acquiring a temperature control signal input by a thermostat for representing a mode state of the air conditioner; Based on the temperature control signal and a preset signal combination mode conversion truth table, a target mode state of the air conditioner is determined, and a set temperature of the air conditioner under the target mode state is determined, wherein the signal combination mode conversion truth table includes a plurality of corresponding sets of comparison relationships between various signal combinations and various mode states of the air conditioner; Based on the target mode state and the set temperature, a rotation speed of the inverter compressor is determined, and the operation of the inverter compressor is controlled based on the rotation speed of the inverter compressor.

2. The variable frequency compressor speed control method for an air conditioner according to claim 1, wherein: The temperature control signal includes a status mark of the compressor operation, a status mark of the four-way valve control, a status mark of the electric heating operation, and a status mark of the fan motor operation; The step of determining the target mode state of the air conditioner based on the temperature control signal and a preset signal combination mode conversion truth table includes: Using the temperature control signal as an index, a match search is performed in the signal combination mode conversion truth table to obtain a target mode state corresponding to the temperature control signal, wherein the target mode state includes the operating wind speed of the air conditioner, the on / off state of the compressor in the air conditioner and / or the operating mode state of the air conditioner, and the temperature control signal includes a combination of multiple state identifiers.

3. The variable frequency compressor speed control method for an air conditioner according to claim 2, wherein: The step of determining a set temperature of the air conditioner in the target mode state comprises: When the air conditioner is in a cooling operation mode, obtaining a current first ambient temperature, comparing the first ambient temperature with a preset first ambient temperature interval, determining a first setting level and a setting temperature of the air conditioner in the cooling operation mode, and recording a corresponding second ambient temperature after running for a preset time period based on the first setting level and the setting temperature, and when the difference between the second ambient temperature and the first ambient temperature is less than or equal to a preset first temperature threshold, adjusting the first setting level down to a second setting level and a setting temperature; When the air conditioner is in a heating operation mode, the current third ambient temperature is obtained, the third ambient temperature is compared with a preset second ambient temperature interval, a third setting level and a setting temperature of the air conditioner in a cooling operation mode are determined, and based on After the third setting level and its setting temperature have been running for a preset time period, the corresponding fourth ambient temperature is recorded, and when the difference between the fourth ambient temperature and the third ambient temperature is less than or equal to the preset second temperature threshold, the third setting level is lowered to the fourth setting level and its setting temperature.

4. The variable frequency compressor speed control method for an air conditioner according to claim 3, wherein: After recording the corresponding second ambient temperature, it also includes: when the difference between the second ambient temperature and the first ambient temperature is less than or equal to the preset first temperature threshold, controlling the operation of the compressor based on the second setting level and its set temperature; when the difference between the second ambient temperature and the first ambient temperature is greater than the preset temperature threshold, controlling the operation of the compressor based on the first setting level and its set temperature.

5. The variable frequency compressor speed control method for an air conditioner according to claim 3, wherein: After recording the corresponding fourth ambient temperature, it also includes: when the difference between the fourth ambient temperature and the third ambient temperature is less than or equal to the preset second temperature threshold, controlling the operation of the compressor based on the fourth setting level and its set temperature; when the difference between the fourth ambient temperature and the third ambient temperature is greater than the preset second temperature threshold, controlling the operation of the compressor based on the third setting level and its set temperature.

6. The variable frequency compressor speed control method for an air conditioner according to claim 1, wherein: The step of determining the rotation speed of the variable frequency compressor based on the target mode state and the set temperature includes: Based on the target mode state and the set temperature, determining the operating frequency corresponding to the variable frequency compressor, and determining the speed value of the variable frequency compressor based on the operating frequency, wherein the operating frequency and the speed of the variable frequency compressor are in direct proportion; The controlling the operation of the variable frequency compressor based on the rotation speed of the variable frequency compressor includes: outputting a signal of the rotation speed value of the variable frequency compressor to a corresponding inverter to control the operation of the variable frequency compressor at the rotation speed.

7. The variable frequency compressor speed control method for an air conditioner according to claim 3, wherein: After obtaining the temperature control signal input by the thermostat to characterize the mode state of the air conditioner, it also includes: triggering the operation of the fan motor when it is determined that the target mode state is a single air supply mode state based on the temperature control signal and a preset signal combination mode conversion truth table.

8. A variable frequency compressor speed control device for an air conditioner, comprising: A temperature control signal acquisition unit, used to acquire a temperature control signal input by a thermostat and used to characterize a mode state of the air conditioner; a set temperature determination unit, configured to determine a target mode state of the air conditioner and a set temperature of the air conditioner under the target mode state based on the temperature control signal and a preset signal combination mode conversion truth table, wherein the signal combination mode conversion truth table includes a plurality of corresponding sets of comparison relationships between various signal combinations and various mode states of the air conditioner; The compressor speed control unit is used to determine the speed of the variable frequency compressor based on the target mode state and the set temperature, and control the operation of the variable frequency compressor based on the speed of the variable frequency compressor.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the variable frequency compressor speed control method of the air conditioner as described in any one of claims 1 to 7 are implemented.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, wherein: When the computer program is executed by a processor, the steps of the variable frequency compressor speed control method for an air conditioner as claimed in any one of claims 1 to 7 are implemented.

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