Air conditioner and control method of air conditioner

Abstract

The invention relates to the technical field of household appliances, in particular to an air conditioner and a control method of the air conditioner, the air conditioner comprises an environment temperature sensor, a fan speed regulation chopper circuit, an outdoor coil temperature sensor, a single-phase alternating current asynchronous motor and a controller, the environment temperature sensor, the fan speed regulation chopper circuit, the outdoor coil temperature sensor and the single-phase alternating current asynchronous motor are connected with one another, and the controller responds to a power-on control instruction. The air conditioner is controlled to operate in a set mode, the indoor environment temperature and the set temperature are obtained in the operation process of the air conditioner, a fan speed regulation chopper circuit of the air conditioner is controlled to work according to the indoor environment temperature and the set temperature, meanwhile, the outdoor coil temperature is obtained, and the fan speed regulation chopper circuit is controlled to work according to the outdoor coil temperature. According to the control method, the temperature of the outdoor coil pipe is obtained, the duty ratio of the fan speed regulation chopper circuit is adjusted according to the temperature of the outdoor coil pipe so as to adjust the rotating speed of the single-phase alternating current asynchronous motor, the rotating speed of the single-phase alternating current asynchronous motor is adjusted to be lower than the rotating speed matched with the temperature of the outdoor coil pipe, the performance requirement of the air conditioner is better met, and the use experience of a user is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to an air conditioner and a control method for the air conditioner. Background Art

[0002] Air conditioner motor speed refers to the number of times the motor rotates per minute. For example, a 25Hz compressor requires 700 rpm for the outdoor unit, 800 rpm for a 50Hz unit, and 900 rpm for a 60Hz unit. Higher frequencies may require higher speeds. When the unit is operating, such as in cooling mode, when the outdoor temperature is low, the air conditioner does not require a higher speed. Matching the motor speed to the required speed can improve air conditioner performance.

[0003] The speed regulation problem of air conditioner motors has always been an important factor affecting their performance and user experience. Currently, air conditioners use PG motors or single-phase asynchronous AC motors. PG motors can detect the speed based on Hall sensors, but the cost is relatively high. Single-phase asynchronous AC motors have the problem of motor speed being unable to be adjusted, resulting in the same speed under different ambient temperatures, outer disks, inner disks, and compressor frequencies, which cannot meet system requirements. For example, in cooling mode, when the outer disk temperature is low, the air conditioner does not need a higher speed, but because the motor speed cannot be adjusted, the motor speed will be greater than the speed required by the air conditioner, sacrificing the cooling utilization rate of the air conditioner itself and reducing the air conditioner energy efficiency, thereby reducing the performance of the air conditioner and the user experience. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, the first purpose of the present invention is to propose an air conditioner, which responds to a power-on control instruction through a controller to control the air conditioner to operate in a set mode. During the operation of the air conditioner, the indoor ambient temperature and the set temperature detected by the outdoor coil temperature sensor are obtained, and the need to adjust the speed of the single-phase AC asynchronous motor is determined based on the indoor ambient temperature and the set temperature, thereby controlling the operation of the fan speed control chopper circuit of the air conditioner. At the same time, the outdoor coil temperature detected by the ambient temperature sensor is obtained, and it is determined that the outdoor coil temperature is low and does not match the current speed of the single-phase AC asynchronous motor, so the duty cycle of the fan speed control chopper circuit will be adjusted to adjust the speed of the single-phase AC asynchronous motor, so as to achieve matching of the speed of the single-phase AC asynchronous motor with the outdoor coil temperature, thereby ensuring the refrigeration utilization rate of the air conditioner itself and the energy efficiency of the air conditioner, thereby improving the performance of the air conditioner and the user experience. An embodiment of the present invention provides an air conditioner, comprising: a refrigerant circulation circuit for refrigerating a refrigerant in a circuit consisting of a compressor, a four-way valve, a condenser, a throttling assembly, and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger; an ambient temperature sensor disposed at an indoor air outlet of the air conditioner for detecting an indoor ambient temperature; an outdoor coil temperature sensor disposed at the outdoor heat exchanger for detecting an outdoor coil temperature; a single-phase AC asynchronous motor disposed in the outdoor unit for adjusting its speed according to the outdoor coil temperature during voltage chopping control; and a controller connected to the single-phase AC asynchronous motor. The controller is configured to, in response to a power-on control instruction, control the air conditioner to operate in a set mode, obtain an indoor ambient temperature and a set temperature during operation of the air conditioner, control a fan speed control chopper circuit of the air conditioner according to the indoor ambient temperature and the set temperature, and simultaneously obtain an outdoor coil temperature and adjust a duty cycle of the fan speed control chopper circuit according to the outdoor coil temperature to adjust the speed of the single-phase AC asynchronous motor.

[0006] The above technical solution has the following advantages or beneficial effects: the air conditioner provided according to an embodiment of the present invention includes an ambient temperature sensor provided in an indoor unit, a fan speed control chopper circuit, an outdoor coil temperature sensor provided in an outdoor unit, a single-phase AC asynchronous motor provided in the outdoor unit, and a controller, wherein the ambient temperature sensor is used to detect the indoor ambient temperature, the outdoor coil temperature sensor is used to detect the outdoor coil temperature, and the single-phase AC asynchronous motor is used to adjust the speed according to the outdoor coil temperature during voltage chopping control. The controller controls the air conditioner to operate in a set mode in response to a power-on control instruction. During the operation of the air conditioner, the indoor ambient temperature and the set temperature are obtained, and the fan speed control chopper circuit of the air conditioner is controlled according to the indoor ambient temperature and the set temperature. At the same time, the controller obtains the outdoor coil temperature and adjusts the duty cycle of the fan speed control chopper circuit according to the outdoor coil temperature to adjust the speed of the single-phase AC asynchronous motor. In this way, the speed of the single-phase AC asynchronous motor is matched with the outdoor coil temperature, thereby ensuring the cooling utilization rate and energy efficiency of the air conditioner itself, thereby improving the performance of the air conditioner and the user experience.

[0007] In addition, an air conditioner according to an embodiment of the present invention may also have the following additional technical features: Furthermore, when controlling the fan speed chopping circuit to perform voltage chopping control according to the indoor ambient temperature and the set temperature, the controller is configured to: calculate the absolute value of the difference between the indoor ambient temperature and the set temperature at preset time intervals; and when the absolute value of the difference is less than a preset temperature threshold, control the fan speed chopping circuit to perform voltage chopping control.

[0008] The above technical solution has the following advantages or beneficial effects: the absolute value of the difference between the indoor ambient temperature and the set temperature is calculated at preset time intervals to provide a judgment condition for the detection of speed adjustment; then, when the absolute value of the difference is less than the preset temperature threshold, the fan speed chopping circuit is controlled to perform voltage chopping control to complete the judgment that the single-phase AC asynchronous motor needs to be speed controlled.

[0009] Furthermore, when the duty cycle of the fan speed regulating chopper circuit is adjusted according to the outdoor coil temperature to adjust the speed of the single-phase AC asynchronous motor, the controller is configured as follows: when the outdoor coil temperature is in a first set temperature range, the fan speed regulating chopper circuit is controlled to operate at a first preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a first speed; when the outdoor coil temperature is in a second set temperature range, the fan speed regulating chopper circuit is controlled to operate at a second preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a second speed; when the outdoor coil temperature is in a third set temperature range, the fan speed regulating chopper circuit is controlled to operate at a third preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a second speed. The motor speed is adjusted to a third speed; when the outdoor coil temperature is in a fourth set temperature range, the fan speed control chopper circuit is controlled to operate a fourth preset duty cycle to adjust the single-phase AC asynchronous motor speed to a fourth speed, wherein the first set temperature range is greater than the second set temperature range, the second set temperature range is greater than the third set temperature range, the third set temperature range is greater than the fourth set temperature range, the first speed is greater than the second speed, the second speed is greater than the third speed, the third speed is greater than the fourth speed, the first duty cycle is greater than the second duty cycle, the second duty cycle is greater than the third duty cycle, and the third duty cycle is greater than the fourth duty cycle.

[0010] The above technical solution has the following advantages or beneficial effects: when the outdoor coil temperature is within the first set temperature range, the fan speed control chopper circuit is controlled to operate at a first preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a first speed, so as to realize that when the air conditioner is in cooling / dehumidification mode and the outdoor coil temperature is at an ultra-high temperature, the fan speed control chopper circuit is controlled to operate at an ultra-high duty cycle, and the speed of the single-phase AC asynchronous motor is adjusted to an ultra-high speed, so as to match the ultra-high temperature outdoor coil temperature with the fan speed control chopper circuit with an ultra-high duty cycle, control the air volume of the air conditioner to an ultra-high speed, control heat dissipation, and improve the user experience; then, when the outdoor coil temperature is within the second set temperature range, the fan speed control chopper circuit is controlled to operate at a second preset duty cycle The fan speed control circuit is controlled to operate at a high duty cycle to adjust the speed of the single-phase AC asynchronous motor to a second speed. When the outdoor coil temperature is high in the cooling / dehumidification mode of the air conditioner, the fan speed control circuit is controlled to operate at a high duty cycle, and the speed of the single-phase AC asynchronous motor is adjusted to a high speed. This matches the high outdoor coil temperature with the high duty cycle of the fan speed control circuit, and the air volume of the air conditioner is controlled to a high speed, thereby controlling heat dissipation and improving the user experience. Subsequently, when the outdoor coil temperature is within a third set temperature range, the fan speed control circuit is controlled to operate at a third preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a third speed. When the outdoor coil temperature is medium in the cooling / dehumidification mode of the air conditioner, the fan speed control circuit is controlled to operate at a high duty cycle to adjust the speed of the single-phase AC asynchronous motor to a medium speed. This matches the medium outdoor coil temperature with the medium duty cycle of the fan speed control circuit, and the air volume of the air conditioner is controlled to a medium speed, thereby controlling heat dissipation and improving the user experience. Then, when the outdoor coil temperature is within a fourth set temperature range, the fan speed regulating chopper circuit is controlled to operate at a fourth preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a fourth speed, so that when the air conditioner is in cooling / dehumidification mode and the outdoor coil temperature is at a low temperature, the fan speed regulating chopper circuit is controlled to operate at a low duty cycle, and the speed of the single-phase AC asynchronous motor is adjusted to a low speed, so as to match the low outdoor coil temperature with the low duty cycle fan speed regulating chopper circuit, control the air volume of the air conditioner to a low speed, control heat dissipation, and improve the user experience. Furthermore, when the duty cycle of the fan speed regulating chopper circuit is adjusted according to the outdoor coil temperature to adjust the speed of the single-phase AC asynchronous motor, the controller is configured as follows: when the outdoor coil temperature is in a first set temperature range, the fan speed regulating chopper circuit is controlled to operate at a fourth preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a fourth speed; when the outdoor coil temperature is in a second set temperature range, the fan speed regulating chopper circuit is controlled to operate at a third preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a third speed; when the outdoor coil temperature is in a third set temperature range, the fan speed regulating chopper circuit is controlled to operate at a second preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a third speed. The motor speed is adjusted to a second speed; when the outdoor coil temperature is in a fourth set temperature range, the fan speed control chopper circuit is controlled to operate a first preset duty cycle to adjust the single-phase AC asynchronous motor speed to a first speed, wherein the first set temperature range is greater than the second set temperature range, the second set temperature range is greater than the third set temperature range, the third set temperature range is greater than the fourth set temperature range, the first speed is greater than the second speed, the second speed is greater than the third speed, the third speed is greater than the fourth speed, the first duty cycle is greater than the second duty cycle, the second duty cycle is greater than the third duty cycle, and the third duty cycle is greater than the fourth duty cycle.

[0011] The above technical solution has the following advantages or beneficial effects: when the outdoor coil temperature is within the first set temperature range, the fan speed control chopper circuit is controlled to operate at a fourth preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a fourth speed, so as to achieve that when the air conditioner is in heating mode and the outdoor coil temperature is at an ultra-high temperature, the fan speed control chopper circuit is controlled to operate at a low duty cycle, the speed of the single-phase AC asynchronous motor is adjusted to a low speed, the low temperature outdoor coil temperature is matched with the fan speed control chopper circuit with a low duty cycle, the air volume of the air conditioner is controlled to a low speed, and the heat exchange is controlled. , improve the user experience, then, when the outdoor coil temperature is in the second set temperature range, control the fan speed control chopper circuit to run the third preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to the third speed, so as to achieve the air conditioner in the heating mode, when the outdoor coil temperature is at a high temperature, control the fan speed control chopper circuit to run the medium duty cycle, adjust the speed of the single-phase AC asynchronous motor to a medium speed, achieve the high temperature outdoor coil temperature and the medium duty cycle fan speed control chopper circuit matching, control the air volume of the air conditioner to a medium speed, control the heat exchange, improve the user experience, then, when the outdoor coil temperature is in the second set temperature range, control the fan speed control chopper circuit to run the third preset duty cycle, adjust the speed of the single-phase AC asynchronous motor to a medium speed, so as to achieve the high temperature outdoor coil temperature and the medium duty cycle fan speed control chopper circuit matching, control the air volume of the air conditioner to a medium speed, control the heat exchange, improve the user experience, then, when the outdoor coil temperature is in the second set temperature range, control the fan speed control chopper circuit to run the third preset duty cycle, adjust the speed of the single-phase AC asynchronous motor to a medium speed ... Then, when the outdoor coil temperature is within the third set temperature range, the fan speed regulating chopper circuit is controlled to operate at a second preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a second speed, so as to achieve that when the air conditioner is in heating mode and the outdoor coil temperature is at medium temperature, the fan speed regulating chopper circuit is controlled to operate at a high duty cycle, and the speed of the single-phase AC asynchronous motor is adjusted to a high speed, so as to match the medium outdoor coil temperature with the high duty cycle fan speed regulating chopper circuit, control the air volume of the air conditioner to medium speed, control heat exchange, and improve the user experience. Then, when the outdoor coil temperature is within the fourth set temperature range, the fan speed regulating chopper circuit is controlled to operate at a first preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a first speed, so that when the air conditioner is in heating mode and the outdoor coil temperature is at a low temperature, the fan speed regulating chopper circuit is controlled to operate at an ultra-high duty cycle, and the speed of the single-phase AC asynchronous motor is adjusted to an ultra-high speed, so as to match the low-temperature outdoor coil temperature with the ultra-high duty cycle fan speed regulating chopper circuit, control the air volume of the air conditioner to an ultra-high speed, control heat exchange, and improve the user experience. Furthermore, in the process of controlling the air conditioner to operate in the set mode, the controller is further configured to: obtain a set duty cycle and a set speed value corresponding to the set duty cycle.

[0012] The above technical solution has the following advantages or beneficial effects: obtaining a set duty cycle and a set speed value corresponding to the set duty cycle, so as to obtain a duty cycle corresponding to a speed that meets the current operation requirements of the air conditioner, and then adjusting the speed of the single-phase AC asynchronous motor according to the duty cycle. Furthermore, after adjusting the speed of the single-phase AC asynchronous motor, the controller is further configured to obtain the outdoor coil temperature at preset time intervals.

[0013] The above technical solution has the following advantages or beneficial effects: the outdoor coil temperature is obtained at preset time intervals to obtain the outdoor coil temperature according to the preset time intervals, detect whether the next speed adjustment of the single-phase AC asynchronous motor is required, and realize continuous adjustment of the speed. Furthermore, the air conditioner further comprises: a fan speed regulating chopper circuit, which is connected to the controller and is used to control the duty cycle according to the PWM pulse signal output by the controller.

[0014] The above technical solution has the following advantages or beneficial effects: a fan speed control chopper circuit, which is connected to the controller and is used to control the duty cycle according to the PWM pulse signal output by the controller, so as to control the duty cycle of the fan speed control chopper circuit, thereby realizing the adjustment of the speed of the single-phase AC asynchronous motor. Furthermore, the fan speed control chopper circuit includes: an isolation circuit, which is connected to the single-phase AC asynchronous motor and is used to convert the PWM pulse signal output by the controller into an AC voltage signal.

[0015] The above technical solution has the following advantages or beneficial effects: an isolation circuit, which is connected to the single-phase AC asynchronous motor and is used to convert the PWM pulse signal output by the controller into an AC voltage signal to control the speed of the single-phase AC asynchronous motor according to the voltage signal. Furthermore, the single-phase AC asynchronous motor includes: a high-power circuit for powering the single-phase AC asynchronous motor; and a starting capacitor connected to the high-power circuit for starting the single-phase AC asynchronous motor.

[0016] The above technical solution has the following advantages or beneficial effects: a high-voltage circuit is used to power the single-phase AC asynchronous motor to realize power supply for the single-phase AC asynchronous motor; then, a starting capacitor is connected to the high-voltage circuit to start the single-phase AC asynchronous motor to ensure the normal operation of the air conditioner.

[0017] To this end, the second object of the present invention is to propose a control method for an air conditioner, which controls the air conditioner to operate in a set mode, obtains the indoor ambient temperature and the set temperature during the operation of the air conditioner, controls the fan speed control chopper circuit of the air conditioner according to the indoor ambient temperature and the set temperature, and at the same time, obtains the outdoor coil temperature, and adjusts the duty cycle of the fan speed control chopper circuit according to the outdoor coil temperature to adjust the speed of the single-phase AC asynchronous motor, thereby realizing the speed adjustment of the low-cost single-phase AC asynchronous motor, so that the speed of the air conditioner matches the system parameters, can better meet the performance requirements of the air conditioner, and improve the user experience.

[0018] An embodiment of the present invention provides a method for controlling an air conditioner. The method includes: controlling the air conditioner to operate in a set mode, obtaining an indoor ambient temperature and a set temperature during operation of the air conditioner, controlling a fan speed control chopper circuit of the air conditioner based on the indoor ambient temperature and the set temperature, and simultaneously obtaining an outdoor coil temperature and adjusting a duty cycle of the fan speed control chopper circuit based on the outdoor coil temperature to adjust the speed of a single-phase AC asynchronous motor.

[0019] The above technical solution has the following advantages or beneficial effects: the air conditioner is controlled to operate in a set mode. During the operation of the air conditioner, the indoor ambient temperature and the set temperature detected by the outdoor coil temperature sensor are obtained, and the need to adjust the speed of the single-phase AC asynchronous motor is determined based on the indoor ambient temperature and the set temperature, thereby controlling the operation of the fan speed control chopper circuit of the air conditioner. At the same time, the outdoor coil temperature detected by the ambient temperature sensor is obtained, and it is determined that the outdoor coil temperature is low and does not match the current speed of the single-phase AC asynchronous motor, so the duty cycle of the fan speed control chopper circuit is adjusted to adjust the speed of the single-phase AC asynchronous motor, so as to achieve matching of the speed of the single-phase AC asynchronous motor with the outdoor coil temperature, thereby ensuring the refrigeration utilization rate of the air conditioner itself and the energy efficiency of the air conditioner, thereby improving the performance of the air conditioner and the user experience.

[0020] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which: Figure 1 is a schematic diagram of a refrigeration cycle system of an air conditioner according to an embodiment of the present invention; Figure 2 is a schematic structural diagram of a controller according to an embodiment of the present invention; Figure 3 A schematic structural diagram of an air conditioner according to an embodiment of the present invention; Figure 4 A circuit diagram of an air conditioner according to an embodiment of the present invention; Figure 5 A schematic structural diagram of an air conditioner according to another embodiment of the present invention; Figure 6 Flowchart of a method for controlling an air conditioner according to one embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0026] like Figure 1As shown, one of the indoor and outdoor heat exchangers is a condenser, and the other is an evaporator. The air conditioner of the present invention utilizes a compressor, condenser, expansion valve, evaporator, and four-way valve to perform a refrigeration cycle. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, supplying refrigerant to the conditioned and heat-exchanged air.

[0027] The compressor compresses the high-temperature, high-pressure refrigerant gas entering through the return pipe and discharges the compressed refrigerant through the exhaust pipe. The discharged refrigerant gas flows into the condenser through the condenser inlet pipe. The condenser condenses the compressed refrigerant into a liquid phase, releasing heat into the surrounding environment through the condensation process.

[0028] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner functions as a heater in heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0029] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser and discharged through the condenser outlet pipe into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material being cooled. Throughout this cycle, the air conditioner regulates the temperature of the indoor space.

[0030] In the embodiment shown in this application, the air conditioner further includes a controller 71. Controller 71 is a device that generates an operational control signal based on an instruction opcode and a timing signal, thereby instructing the air conditioner to execute the control instruction. For example, in response to a power-on or power-off instruction received from a user, controller 71 may execute an operation related to the object selected by the power-on or power-off instruction.

[0031] The embodiment of the present application also provides a hardware structure diagram of a controller 71, such as Figure 2 As shown, the controller 71 includes a processor 83 and, optionally, a memory 82 and a communication interface 84 connected to the processor 83. The processor 83, the memory 82 and the communication interface 84 are connected via a bus 81.

[0032] The processor 83 may be a central processing unit (CPU), a general-purpose processor (GP), a network processor (NP), a digital signal processor (DSP), a microprocessor (MCU), a microcontroller (MCU), a programmable logic device (PLD), or any combination thereof. The processor 83 may also be any other device having a processing function, such as a circuit, a device, or a software module. The processor 83 may also include multiple CPUs, and the processor 83 may be a single-CPU processor or a multi-CPU processor. The processor 83 herein may refer to one or more devices, circuits, or processing cores for processing data (e.g., computer program instructions).

[0033] The memory 82 can be a read-only memory 82 (ROM) or other types of static storage devices that can store static information and instructions, a random access memory 82 (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory 82 (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and can be accessed by a computer. The embodiments of the present application do not impose any restrictions on this. The memory 82 can exist independently or be integrated with the processor 83. Among them, the memory 82 can contain computer program code. The processor 83 is used to execute the computer program code stored in the memory 82, thereby realizing the control method of the air conditioner provided in the embodiments of the present application.

[0034] The communication interface 84 can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area network (WLAN), etc.). The communication interface 84 can be a module, a circuit, a transceiver or any device that can achieve communication.

[0035] The bus 81 may be a peripheral component interconnect (PCI) bus 81 or an extended industry standard architecture (EISA) bus 81. The bus 81 may be divided into an address bus 81, a data bus 81, a control bus 81, and the like.

[0036] Reference below Figure 3-Figure 5 An air conditioner according to an embodiment of the present invention is described.

[0037] Figure 3 FIG. 1 is a schematic diagram of the structure of an air conditioner according to an embodiment of the present invention. Figure 3 As shown, an air conditioner 20 provided by an embodiment of the present invention includes: a refrigerant circulation circuit, which allows the refrigerant to perform a refrigeration cycle in a circuit consisting of a compressor, a four-way valve, a condenser, a throttling component, and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger; an ambient temperature sensor 23, which is arranged at the indoor air outlet of the air conditioner 20 and is used to detect the indoor ambient temperature; an outdoor coil temperature sensor 26, which is arranged at the outdoor heat exchanger and is used to detect the outdoor coil temperature; a single-phase AC asynchronous motor 27, which is arranged at the outdoor unit and is used to control the voltage chopping control. When the air conditioner 20 is in operation, the speed is adjusted according to the outdoor coil temperature; the controller 24 is connected to the single-phase AC asynchronous motor 27, and the controller 24 is configured to: respond to the power-on control instruction, control the air conditioner 20 to operate in the set mode, obtain the indoor ambient temperature and the set temperature during the operation of the air conditioner 20, control the fan speed control chopper circuit 25 of the air conditioner 20 to work according to the indoor ambient temperature and the set temperature, and at the same time, obtain the outdoor coil temperature and adjust the duty cycle of the fan speed control chopper circuit 25 according to the outdoor coil temperature to adjust the speed of the single-phase AC asynchronous motor 27.

[0038] To save costs, air conditioners generally use single-phase asynchronous AC motors. However, the windings of single-phase asynchronous AC motors have no speed detection devices. Regardless of the state of the air conditioner, it can only run at a fixed speed and cannot match the air conditioning system. For example, when the compressor runs at 25HZ, the outdoor unit speed is 700 rpm, 50HZ outdoor unit speed is 800 rpm, and 60HZ outdoor unit speed is 900 rpm. Higher frequencies may require higher speeds so that the speed matches the system parameters to better meet the air conditioner performance requirements. However, the current single-phase asynchronous AC motors cannot adjust the speed, resulting in the speed not matching the system parameters, which reduces the performance of the air conditioner and the user experience.

[0039] According to the embodiment of the present invention, when the air conditioner 20 adjusts the speed of the single-phase asynchronous AC motor 27, the outdoor coil temperature sensor 26 provided at the indoor air outlet of the air conditioner 20 is used to detect the indoor ambient temperature, so as to prepare data for controlling the operation of the fan speed regulating chopper circuit; the ambient temperature sensor 23 provided at the indoor air outlet of the air conditioner 20 is used to detect the outdoor coil temperature, so as to prepare data for adjusting the duty cycle of the fan speed regulating chopper circuit; the single-phase AC asynchronous motor 27 provided at the outdoor unit is used to adjust the speed of the single-phase AC asynchronous motor 27 according to the outdoor coil temperature when performing voltage chopping control; and the single-phase AC asynchronous motor 27 is connected to the outdoor unit. The controller 24 responds to the power-on control command and controls the air conditioner 20 to operate in the set mode. During the operation of the air conditioner 20, the indoor ambient temperature and the set temperature are obtained, and the fan speed control chopper circuit 25 of the air conditioner 20 is controlled to operate according to the indoor ambient temperature and the set temperature. At the same time, the outdoor coil temperature is obtained, and the duty cycle of the fan speed control chopper circuit 25 is adjusted according to the outdoor coil temperature to adjust the speed of the single-phase AC asynchronous motor 27, thereby achieving speed adjustment of the low-cost single-phase AC asynchronous motor within a certain range, so that the motor speed is maximized, so that the speed of the air conditioner matches the system parameters, can better meet the performance requirements of the air conditioner, and enhance the user experience.

[0040] When the current air conditioner is in operation, for example in cooling mode, when the outside disk temperature is low, the air conditioner does not need a higher speed. However, because the speed of the single-phase AC asynchronous motor cannot be adjusted, the speed remains unchanged after it is turned on. The speed of the motor is greater than the speed required by the air conditioner, which sacrifices the cooling utilization rate of the air conditioner itself and reduces the energy efficiency of the air conditioner.

[0041] To address the above problem, an ambient temperature sensor 23 is provided at the indoor air outlet of the air conditioner 20 to detect the indoor ambient temperature and prepare data for controlling the operation of the fan speed chopper circuit 25. The fan speed chopper circuit 25 is a circuit that can adjust the voltage.

[0042] An outdoor coil temperature sensor 26 is installed at the indoor air outlet of air conditioner 20 to detect the outdoor coil temperature and provide data for adjusting the duty cycle of the fan speed chopper circuit. The fan speed chopper circuit 25 adjusts the voltage by adjusting the circuit's duty cycle, thereby adjusting the speed of the single-phase AC asynchronous motor 27.

[0043] A single-phase AC asynchronous motor 27 is provided at the outdoor unit to adjust the speed of the single-phase AC asynchronous motor 27 according to the outdoor coil temperature when performing voltage chopping control, so as to match the speed of the single-phase AC asynchronous motor 27 with the outdoor coil temperature. For example, in cooling / dehumidification mode, the higher the temperature of the outdoor coil, the poorer the heat dissipation, and the speed of the single-phase AC asynchronous motor 27 needs to be increased to increase the air volume and improve the user experience.

[0044] A controller 24 is provided to which a single-phase AC asynchronous motor 27 is connected. The controller 24 is used to respond to a power-on control command. After the air conditioner 20 is powered on, the controller 24 controls the air conditioner 20 to operate in a set mode. The set mode is an operating mode that includes an embodiment of the present invention in which the speed of the single-phase AC asynchronous motor 27 can be adjusted. For example, a mode in which the duty cycle is 100% and the speed is operated at the rated speed. During the operation of the air conditioner 20, the controller 24 obtains the indoor ambient temperature detected by the ambient temperature sensor 23 and a set temperature, which is a conditional determination value for adjusting the speed of the single-phase AC asynchronous motor 27. The controller 24 controls the operation of the fan speed control chopper circuit 25 of the air conditioner 20 based on the indoor ambient temperature and the set temperature. At the same time, the controller 24 obtains the outdoor coil temperature detected by the outdoor coil temperature sensor 26 and adjusts the duty cycle of the fan speed control chopper circuit based on the outdoor coil temperature to adjust the speed of the single-phase AC asynchronous motor 27 to a speed that matches the outdoor coil temperature.

[0045] For example, with current technology, in cooling mode, when the external disk temperature is low, the air conditioner does not need a higher speed. However, because the speed of the single-phase AC asynchronous motor cannot be adjusted, the speed remains unchanged after it is turned on. The speed of the motor is greater than the speed required by the air conditioner, which sacrifices the cooling utilization rate of the air conditioner itself and reduces the energy efficiency of the air conditioner.

[0046] According to the air conditioner 20 provided by the embodiment of the present invention, in cooling mode, when the outdoor coil temperature is low, the air conditioner does not need a higher speed. Therefore, the outdoor coil temperature sensor 26 is used to detect the indoor ambient temperature to prepare data for controlling the operation of the fan speed control chopper circuit 25. Then, the outdoor coil temperature sensor 26 is used to detect the outdoor coil temperature to prepare data for adjusting the duty cycle of the fan speed control chopper circuit. Then, the controller 24 is used to control the air conditioner 20 to operate in a setting mode in which the speed of the single-phase AC asynchronous motor 27 is adjustable. The controller 24 obtains the indoor ambient temperature and the set temperature. At the same time, it obtains the outdoor coil temperature and determines that the outdoor coil temperature is low and does not match the current speed of the single-phase AC asynchronous motor 27. Therefore, the duty cycle of the fan speed control chopper circuit is adjusted to adjust the speed of the single-phase AC asynchronous motor 27 to achieve matching of the speed of the single-phase AC asynchronous motor 27 with the outdoor coil temperature, thereby ensuring the cooling utilization rate of the air conditioner itself and the energy efficiency of the air conditioner.

[0047] In one embodiment of the present invention, when the fan speed regulating chopper circuit 25 is controlled to perform voltage chopping control according to the indoor ambient temperature and the set temperature, the controller 24 is configured to: calculate the absolute value of the difference between the indoor ambient temperature and the set temperature at preset time intervals; when the absolute value of the difference is less than the preset temperature threshold, control the fan speed regulating chopper circuit 25 to perform voltage chopping control.

[0048] In a specific embodiment, the set temperature is a conditional judgment value for the need to adjust the speed of the single-phase AC asynchronous motor 27, which is set to Ts. The preset time is a value set according to demand and experimental calibration, which is used to set the detection frequency for adjusting the speed of the single-phase AC asynchronous motor 27. After detecting that the speed adjustment is required, the voltage chopping control will be entered, which is set to 2 minutes. The indoor ambient temperature is set to Tr. The preset temperature threshold is the critical value for the need to adjust the speed of the single-phase AC asynchronous motor 27, which is set to 2°C. When the fan speed chopping circuit 25 is controlled to perform voltage chopping control according to the indoor ambient temperature and the set temperature, the controller 24 is configured to calculate the absolute value of the difference between the indoor ambient temperature Tr and the set temperature Ts every 2 minutes, that is, |Tr-Ts|.

[0049] Then, when the absolute value of the difference is less than the preset temperature threshold, ie, |Tr-Ts|<2° C., the fan speed regulating chopper circuit 25 is controlled to perform voltage chopping control.

[0050] Specifically, according to the air conditioner 20 provided by the embodiment of the present invention, when the fan speed control chopper circuit 25 is controlled to perform voltage chopping control according to the indoor ambient temperature and the set temperature, the controller 24 is configured to: detect whether the single-phase AC asynchronous motor 27 needs speed adjustment according to the preset time interval, specifically, calculate the absolute value of the difference between the indoor ambient temperature and the set temperature to provide a judgment condition for the speed adjustment detection, and then, when the absolute value of the difference is less than the preset temperature threshold, it is determined that the speed of the single-phase AC asynchronous motor 27 needs to be adjusted, and then the fan speed control chopper circuit 25 is controlled to perform voltage chopping control to complete the judgment that the single-phase AC asynchronous motor 27 needs speed control.

[0051] In one embodiment of the present invention, when the duty cycle of the fan speed regulating chopper circuit is adjusted according to the outdoor coil temperature to adjust the speed of the single-phase AC asynchronous motor, the controller 24 is configured as follows: when the outdoor coil temperature is in a first set temperature range, the fan speed regulating chopper circuit 25 is controlled to operate at a first preset duty cycle to adjust the speed of the single-phase AC asynchronous motor 27 to a first speed; when the outdoor coil temperature is in a second set temperature range, the fan speed regulating chopper circuit 25 is controlled to operate at a second preset duty cycle to adjust the speed of the single-phase AC asynchronous motor 27 to a second speed; when the outdoor coil temperature is in a third set temperature range, the fan speed regulating chopper circuit 25 is controlled to operate at a third preset duty cycle to adjust the speed of the single-phase AC asynchronous motor 27 to a second speed. A preset duty cycle is used to adjust the speed of the single-phase AC asynchronous motor 27 to a third speed; when the outdoor coil temperature is in a fourth set temperature range, the fan speed control chopper circuit 25 is controlled to operate a fourth preset duty cycle to adjust the speed of the single-phase AC asynchronous motor 27 to a fourth speed, wherein the first set temperature range is greater than the second set temperature range, the second set temperature range is greater than the third set temperature range, the third set temperature range is greater than the fourth set temperature range, the first speed is greater than the second speed, the second speed is greater than the third speed, the third speed is greater than the fourth speed, the first duty cycle is greater than the second duty cycle, the second duty cycle is greater than the third duty cycle, and the third duty cycle is greater than the fourth duty cycle.

[0052] In a specific embodiment, the first set temperature range, the second set temperature range, the third set temperature range, and the fourth set temperature range are range gradients divided according to requirements and experimental calibration, and the outdoor coil temperature and the speed of the single-phase AC asynchronous motor 27 are matched according to the standard of outdoor coil temperature and speed. For example, in the cooling / dehumidification mode of the air conditioner, the first set temperature range is set to 40-46°C, the second set temperature range is set to 30-38°C, the third set temperature range is set to 24-28°C, and the fourth set temperature range is set to 20-23°C. The first speed, the second speed, the third speed, and the fourth speed have a one-to-one correspondence with the first preset duty cycle, the second preset duty cycle, the third preset duty cycle, and the fourth preset duty cycle. The speed can be adjusted by adjusting the duty cycle. For example, the first speed is set to the rated speed, the second speed is set to the second gear, the third speed is set to the third gear, and the fourth speed is set to the fourth gear. The first preset duty cycle is set to 100, the second preset duty cycle is set to 90, the third preset duty cycle is set to 80, and the fourth preset duty cycle is set to 70. The corresponding table of the relationship between the duty cycle and the speed is as follows: Table 1 Relationship between duty cycle and speed

[0053] The storage location in the above table is the location where the table is stored in the database. When the duty cycle of the fan speed control chopper circuit is adjusted according to the outdoor coil temperature to adjust the speed of the single-phase AC asynchronous motor, if the air conditioner operates in cooling / dehumidification mode, the higher the external disk temperature, the poorer the heat dissipation, and the duty cycle needs to be increased to increase the air volume. Similarly, the lower the external disk temperature, the better the heat dissipation, and the duty cycle can be reduced to reduce the speed. Therefore, the controller 24 is configured as follows: when the outdoor coil temperature is in the first set temperature range of 40-46°C, the fan speed control chopper circuit 25 is controlled to operate the first preset duty cycle of 100% to adjust the speed of the single-phase AC asynchronous motor 27 to the first rated speed.

[0054] Next, when the outdoor coil temperature is in the second set temperature range of 30-38° C., the fan speed regulating chopper circuit 25 is controlled to operate at the second preset duty cycle of 90% to adjust the speed of the single-phase AC asynchronous motor 27 to the second speed second gear.

[0055] Next, when the outdoor coil temperature is in the third set temperature range of 24-28° C., the fan speed regulating chopper circuit 25 is controlled to operate at a third preset duty cycle of 80% to adjust the speed of the single-phase AC asynchronous motor 27 to the third speed and third gear.

[0056] Next, when the outdoor coil temperature is in the fourth set temperature range of 20-23°C, the fan speed control chopper circuit 25 is controlled to operate at a fourth preset duty cycle of 70% to adjust the speed of the single-phase AC asynchronous motor 27 to the fourth speed fourth gear, wherein the first set temperature range is greater than the second set temperature range, the second set temperature range is greater than the third set temperature range, the third set temperature range is greater than the fourth set temperature range, the first speed is greater than the second speed, the second speed is greater than the third speed, the third speed is greater than the fourth speed, the first duty cycle is greater than the second duty cycle, the second duty cycle is greater than the third duty cycle, and the third duty cycle is greater than the fourth duty cycle.

[0057] Specifically, according to the air conditioner 20 provided in an embodiment of the present invention, when the duty cycle of the fan speed control chopper circuit is adjusted according to the outdoor coil temperature to adjust the speed of the single-phase AC asynchronous motor, the controller 24 is configured as follows: when the outdoor coil temperature is in a first set temperature range, the fan speed control chopper circuit 25 is controlled to run a first preset duty cycle to adjust the speed of the single-phase AC asynchronous motor 27 to a first speed, so as to realize that when the air conditioner is in cooling / dehumidification mode and the outdoor coil temperature is at an ultra-high temperature, the fan speed control chopper circuit 25 is controlled to run an ultra-high duty cycle, and the speed of the single-phase AC asynchronous motor 27 is adjusted to an ultra-high speed, so as to match the ultra-high outdoor coil temperature with the ultra-high duty cycle fan speed control chopper circuit 25, control the air volume of the air conditioner to an ultra-high speed, control heat dissipation, and improve the user experience.

[0058] Then, when the outdoor coil temperature is in the second set temperature range, the fan speed control chopper circuit 25 is controlled to run the second preset duty cycle to adjust the speed of the single-phase AC asynchronous motor 27 to the second speed, so that the air conditioner is in the cooling / dehumidification mode. When the outdoor coil temperature is at a high temperature, the fan speed control chopper circuit 25 is controlled to run a high duty cycle and adjust the speed of the single-phase AC asynchronous motor 27 to a high speed, so as to match the high temperature of the outdoor coil temperature with the high duty cycle of the fan speed control chopper circuit 25, control the air volume of the air conditioner to a high speed, control heat dissipation, and improve the user experience.

[0059] Next, when the outdoor coil temperature is in the third set temperature range, the fan speed control chopper circuit 25 is controlled to run the third preset duty cycle to adjust the speed of the single-phase AC asynchronous motor 27 to the third speed, so that the air conditioner is in the cooling / dehumidification mode. When the outdoor coil temperature is at medium temperature, the fan speed control chopper circuit 25 is controlled to run the high and medium duty cycle, and the speed of the single-phase AC asynchronous motor 27 is adjusted to medium speed, so as to match the medium outdoor coil temperature with the medium duty cycle fan speed control chopper circuit 25, control the air volume of the air conditioner to medium speed, control heat dissipation, and improve the user experience.

[0060] Next, when the outdoor coil temperature is in the fourth set temperature range, the fan speed control chopper circuit 25 is controlled to run the fourth preset duty cycle to adjust the speed of the single-phase AC asynchronous motor 27 to the fourth speed, so that the air conditioner is in the cooling / dehumidification mode. When the outdoor coil temperature is at a low temperature, the fan speed control chopper circuit 25 is controlled to run at a low duty cycle, and the speed of the single-phase AC asynchronous motor 27 is adjusted to a low speed, so as to match the low temperature outdoor coil temperature with the low duty cycle fan speed control chopper circuit 25, control the air volume of the air conditioner to a low speed, control heat dissipation, and improve the user experience.

[0061] Among them, the first set temperature range is greater than the second set temperature range, the second set temperature range is greater than the third set temperature range, the third set temperature range is greater than the fourth set temperature range, the first speed is greater than the second speed, the second speed is greater than the third speed, the third speed is greater than the fourth speed, the first duty cycle is greater than the second duty cycle, the second duty cycle is greater than the third duty cycle, and the third duty cycle is greater than the fourth duty cycle.

[0062] In one embodiment of the present invention, when the duty cycle of the fan speed regulating chopper circuit is adjusted according to the outdoor coil temperature to adjust the speed of the single-phase AC asynchronous motor, the controller 24 is configured as follows: when the outdoor coil temperature is in the first set temperature range, the fan speed regulating chopper circuit 25 is controlled to operate at a fourth preset duty cycle to adjust the speed of the single-phase AC asynchronous motor 27 to a fourth speed; when the outdoor coil temperature is in the second set temperature range, the fan speed regulating chopper circuit 25 is controlled to operate at a third preset duty cycle to adjust the speed of the single-phase AC asynchronous motor 27 to a third speed; when the outdoor coil temperature is in the third set temperature range, the fan speed regulating chopper circuit 25 is controlled to operate at a second preset duty cycle to adjust the speed of the single-phase AC asynchronous motor 27 to a third speed. A preset duty cycle is used to adjust the speed of the single-phase AC asynchronous motor 27 to a second speed; when the outdoor coil temperature is in a fourth set temperature range, the fan speed control chopper circuit 25 is controlled to operate a first preset duty cycle to adjust the speed of the single-phase AC asynchronous motor 27 to a first speed, wherein the first set temperature range is greater than the second set temperature range, the second set temperature range is greater than the third set temperature range, the third set temperature range is greater than the fourth set temperature range, the first speed is greater than the second speed, the second speed is greater than the third speed, the third speed is greater than the fourth speed, the first duty cycle is greater than the second duty cycle, the second duty cycle is greater than the third duty cycle, and the third duty cycle is greater than the fourth duty cycle.

[0063] In a specific embodiment, the duty cycle of the fan speed control chopper circuit is adjusted according to the outdoor coil temperature to adjust the speed of the single-phase AC asynchronous motor. If the air conditioner operates in heating mode, the lower the outdoor coil temperature, the smaller the temperature difference with the outer ring temperature, the poorer the heat exchange, and the duty cycle needs to be increased to increase the air volume. Similarly, a high outdoor coil temperature represents good heat exchange, and the duty cycle can be reduced to reduce the speed. Therefore, the controller 24 is configured to: when the outdoor coil temperature is in the first set temperature range of 40-46°C, control the fan speed control chopper circuit 25 to operate at a fourth preset duty cycle of 70% to adjust the speed of the single-phase AC asynchronous motor 27 to the fourth speed fourth gear.

[0064] When the outdoor coil temperature is in the second set temperature range of 30-38°C, the fan speed regulating chopper circuit 25 is controlled to operate at the third preset duty cycle of 80% to adjust the speed of the single-phase AC asynchronous motor 27 to the third speed and the third gear.

[0065] When the outdoor coil temperature is in the third set temperature range of 24-28°C, the fan speed regulating chopper circuit 25 is controlled to operate at the second preset duty cycle of 90% to adjust the speed of the single-phase AC asynchronous motor 27 to the second speed second gear.

[0066] When the outdoor coil temperature is in the fourth set temperature range of 20-23° C., the fan speed regulating chopper circuit 25 is controlled to operate at a first preset duty cycle of 100% to adjust the speed of the single-phase AC asynchronous motor 27 to the first rated speed.

[0067] Among them, the first set temperature range is greater than the second set temperature range, the second set temperature range is greater than the third set temperature range, the third set temperature range is greater than the fourth set temperature range, the first speed is greater than the second speed, the second speed is greater than the third speed, the third speed is greater than the fourth speed, the first duty cycle is greater than the second duty cycle, the second duty cycle is greater than the third duty cycle, and the third duty cycle is greater than the fourth duty cycle.

[0068] Specifically, according to the air conditioner 20 provided in an embodiment of the present invention, when the duty cycle of the fan speed control chopper circuit is adjusted according to the outdoor coil temperature to adjust the speed of the single-phase AC asynchronous motor, the controller 24 is configured as follows: when the outdoor coil temperature is in the first set temperature range of 40-46°C, the fan speed control chopper circuit 25 is controlled to operate at a fourth preset duty cycle of 70% to adjust the speed of the single-phase AC asynchronous motor 27 to the fourth speed and fourth gear, so that when the air conditioner is in heating mode and the outdoor coil temperature is at an ultra-high temperature, the fan speed control chopper circuit 25 is controlled to operate at a low duty cycle, and the speed of the single-phase AC asynchronous motor 27 is adjusted to a low speed, so as to match the low temperature outdoor coil temperature with the low duty cycle fan speed control chopper circuit 25, control the air volume of the air conditioner to a low speed, control the heat exchange, and improve the user experience.

[0069] When the outdoor coil temperature is in the second set temperature range of 30-38°C, the fan speed control chopper circuit 25 is controlled to operate at the third preset duty cycle of 80% to adjust the speed of the single-phase AC asynchronous motor 27 to the third speed third gear, so that the air conditioner is in heating mode and the outdoor coil temperature is at a high temperature. The fan speed control chopper circuit 25 is controlled to operate at a medium duty cycle, and the speed of the single-phase AC asynchronous motor 27 is adjusted to a medium speed, so as to match the high temperature outdoor coil temperature with the medium duty cycle fan speed control chopper circuit 25, control the air volume of the air conditioner to a medium speed, control the heat exchange, and improve the user experience.

[0070] When the outdoor coil temperature is in the third set temperature range of 24-28°C, the fan speed control chopper circuit 25 is controlled to operate at the second preset duty cycle of 90% to adjust the speed of the single-phase AC asynchronous motor 27 to the second speed second gear, so that the air conditioner is in heating mode. When the outdoor coil temperature is at medium temperature, the fan speed control chopper circuit 25 is controlled to operate at a high duty cycle and adjust the speed of the single-phase AC asynchronous motor 27 to a high speed, so as to match the medium outdoor coil temperature with the high duty cycle fan speed control chopper circuit 25, control the air volume of the air conditioner to medium speed, control heat exchange, and improve the user experience.

[0071] When the outdoor coil temperature is in the fourth set temperature range of 20-23°C, the fan speed control chopper circuit 25 is controlled to operate at a first preset duty cycle of 100% to adjust the speed of the single-phase AC asynchronous motor 27 to the first rated speed, so that when the air conditioner is in heating mode and the outdoor coil temperature is at a low temperature, the fan speed control chopper circuit 25 is controlled to operate at an ultra-high duty cycle, and the speed of the single-phase AC asynchronous motor 27 is adjusted to an ultra-high speed, so as to match the low temperature of the outdoor coil temperature with the ultra-high duty cycle of the fan speed control chopper circuit 25, control the air volume of the air conditioner to an ultra-high speed, control the heat exchange, and improve the user experience.

[0072] Among them, the first set temperature range is greater than the second set temperature range, the second set temperature range is greater than the third set temperature range, the third set temperature range is greater than the fourth set temperature range, the first speed is greater than the second speed, the second speed is greater than the third speed, the third speed is greater than the fourth speed, the first duty cycle is greater than the second duty cycle, the second duty cycle is greater than the third duty cycle, and the third duty cycle is greater than the fourth duty cycle.

[0073] In one embodiment of the present invention, during the process of controlling the air conditioner to operate in the set mode, the controller 24 is further configured to: obtain a set duty cycle and a set speed value corresponding to the set duty cycle.

[0074] In a specific embodiment, the duty cycle is set, for example, the first to fourth duty cycles in the above embodiment, or other duty cycle gradients divided according to demand and experimental calibration, and the speed value is set, for example, the first to fourth speeds in the above embodiment, or other speed gradients divided according to demand and experimental calibration, etc. In the process of controlling the air conditioner to operate in the set mode, the controller 24 is further configured to: obtain the set duty cycle and the set speed value corresponding to the set duty cycle according to the above Table 1, for example, the set duty cycle of 100% corresponds to the set speed rated speed.

[0075] Specifically, according to the air conditioner 20 provided in an embodiment of the present invention, when controlling the air conditioner to operate in a set mode, the controller 24 is further configured to: obtain a set duty cycle and a set speed value corresponding to the set duty cycle, so as to obtain a duty cycle corresponding to a speed that meets the current operation requirements of the air conditioner, and then adjust the speed of the single-phase AC asynchronous motor according to the duty cycle.

[0076] In one embodiment of the present invention, after adjusting the speed of the single-phase AC asynchronous motor, the controller 24 is further configured to obtain the outdoor coil temperature at every preset time interval.

[0077] In a specific embodiment, the preset time interval is set to set the detection frequency of the next speed adjustment after the speed adjustment of the single-phase AC asynchronous motor 27, which is set to 10 minutes. After the speed adjustment of the single-phase AC asynchronous motor, the controller 24 is also configured to: obtain the outdoor coil temperature every 10 minutes.

[0078] Specifically, according to the air conditioner 20 provided in the embodiment of the present invention, after adjusting the speed of the single-phase AC asynchronous motor, the controller 24 is further configured to: obtain the outdoor coil temperature at every preset time interval, so as to obtain the outdoor coil temperature according to the preset time interval, detect whether the next speed adjustment of the single-phase AC asynchronous motor 27 is required, and realize continuous adjustment of the speed.

[0079] Figure 4 FIG. 1 is a circuit diagram of an air conditioner according to an embodiment of the present invention. Figure 5 FIG2 is a schematic diagram of the structure of an air conditioner according to another embodiment of the present invention. In one embodiment of the present invention, the air conditioner 20 further includes a fan speed control chopper circuit 25 connected to the controller 24 for controlling the duty cycle according to the PWM pulse signal output by the controller 24.

[0080] In a specific embodiment, the air conditioner 20 also includes: a fan speed control chopper circuit 25, which is connected to the controller 24 and is used to directly control the conduction and shutdown of the transistor 33 according to the PWM pulse signal output by the controller 24, thereby realizing duty cycle control through the duty cycle control port 31.

[0081] Specifically, the air conditioner 20 provided according to an embodiment of the present invention further includes: a fan speed control chopper circuit 25, which is connected to the controller 24 and is used to control the duty cycle according to the PWM pulse signal output by the controller 24, so as to control the duty cycle of the fan speed control chopper circuit 25, thereby realizing the adjustment of the speed of the single-phase AC asynchronous motor 27.

[0082] In one embodiment of the present invention, the fan speed chopper circuit 25 includes an isolation circuit 32 connected to the single-phase AC asynchronous motor 27 and used to convert the PWM pulse signal output by the controller into an AC voltage signal.

[0083] In a specific embodiment, the fan speed chopper circuit 25 includes: an isolation circuit 32, which is connected to the single-phase AC asynchronous motor 27. The isolation circuit 32 is, for example, an optocoupler thyristor, and is used to convert the PWM pulse signal output by the controller into an AC voltage signal.

[0084] Specifically, in the air conditioner 20 provided according to an embodiment of the present invention, the fan speed control chopper circuit 25 includes: an isolation circuit 32, the isolation circuit 32 is connected to the single-phase AC asynchronous motor 27, and is used to convert the PWM pulse signal output by the controller into an AC voltage signal to control the speed of the single-phase AC asynchronous motor according to the voltage signal.

[0085] In one embodiment of the present invention, the single-phase AC asynchronous motor 27 includes: a high-power circuit for supplying power to the single-phase AC asynchronous motor 27; and a starting capacitor connected to the high-power circuit for starting the single-phase AC asynchronous motor 27.

[0086] In a specific embodiment, the single-phase AC asynchronous motor 27 includes: a high-power circuit for powering the single-phase AC asynchronous motor 27; a starting capacitor C840 forming a starting circuit 30, and the starting capacitor C840 is connected to the high-power circuit for starting the single-phase AC asynchronous motor 27.

[0087] Specifically, the air conditioner 20 provided according to an embodiment of the present invention, the single-phase AC asynchronous motor 27 includes: a high-power circuit for powering the single-phase AC asynchronous motor 27; a starting capacitor connected to the high-power circuit for starting the single-phase AC asynchronous motor 27, so as to power the single-phase AC asynchronous motor and ensure the normal operation of the air conditioner.

[0088] In combination with the above, an air conditioner 20 provided according to an embodiment of the present invention has the following beneficial effects: First, according to an embodiment of the present invention, an air conditioner 20 is provided, in which an ambient temperature sensor 23 is provided at the indoor air outlet of the air conditioner 20 to detect the indoor ambient temperature and prepare data for controlling the operation of the fan speed control chopper circuit 25.

[0089] Secondly, according to an embodiment of the present invention, an air conditioner 20 is provided, in which an outdoor coil temperature sensor 26 is provided at the indoor air outlet of the air conditioner 20 to detect the outdoor coil temperature and prepare data for adjusting the duty cycle of the fan speed control chopper circuit.

[0090] Secondly, according to an air conditioner 20 provided by an embodiment of the present invention, a single-phase AC asynchronous motor 27 is provided at the outdoor unit to adjust the speed of the single-phase AC asynchronous motor 27 according to the outdoor coil temperature when performing voltage chopping control, so as to match the speed of the single-phase AC asynchronous motor 27 with the outdoor coil temperature. For example, in the cooling / dehumidification mode, the higher the temperature of the outdoor coil, the poorer the heat dissipation, and the speed of the single-phase AC asynchronous motor 27 needs to be increased to increase the air volume and improve the user experience.

[0091] Finally, according to an embodiment of the present invention, an air conditioner 20 is provided with a controller 24 connected to a single-phase AC asynchronous motor 27. The controller 24 is used to respond to a power-on control command. After the air conditioner 20 is powered on, the controller 24 controls the air conditioner 20 to operate in a set mode. The set mode is an operating mode that includes an embodiment of the present invention in which the speed of the single-phase AC asynchronous motor 27 can be adjusted. During the operation of the air conditioner 20, the controller 24 obtains the indoor ambient temperature detected by the ambient temperature sensor 23 and the set temperature. The set temperature is a conditional judgment value that requires the speed of the single-phase AC asynchronous motor 27 to be adjusted. The controller 24 controls the operation of the fan speed control chopper circuit 25 of the air conditioner 20 based on the indoor ambient temperature and the set temperature. At the same time, the controller 24 obtains the outdoor coil temperature detected by the outdoor coil temperature sensor 26 and adjusts the duty cycle of the fan speed control chopper circuit based on the outdoor coil temperature to adjust the speed of the single-phase AC asynchronous motor 27 to a speed that matches the outdoor coil temperature.

[0092] In summary, according to the air conditioner 20 provided in the embodiment of the present invention, the air conditioner 20 includes an interconnected ambient temperature sensor 23, a fan speed control chopper circuit 25, an outdoor coil temperature sensor 26 and a single-phase AC asynchronous motor 27, and a controller 24. The controller 24 responds to the power-on control instruction to control the air conditioner 20 to operate in the set mode. During the operation of the air conditioner 20, the indoor ambient temperature and the set temperature are obtained, and the fan speed control chopper circuit 25 of the air conditioner is controlled to work according to the indoor ambient temperature and the set temperature. At the same time, the outdoor coil temperature is obtained, and the duty cycle of the fan speed control chopper circuit 25 is adjusted according to the outdoor coil temperature to adjust the speed of the single-phase AC asynchronous motor 27. The speed of the single-phase AC asynchronous motor 27 is adjusted to a speed that matches the outdoor coil temperature, so as to better meet the performance requirements of the air conditioner and enhance the user experience.

[0093] Reference below Figure 6 A method for controlling an air conditioner according to an embodiment of the present invention is described.

[0094] In one embodiment of the present invention, a method for controlling an air conditioner includes: controlling the air conditioner to operate in a set mode, obtaining an indoor ambient temperature and a set temperature during operation of the air conditioner, controlling a fan speed control chopper circuit of the air conditioner according to the indoor ambient temperature and the set temperature, and simultaneously obtaining an outdoor coil temperature and adjusting a duty cycle of the fan speed control chopper circuit according to the outdoor coil temperature to adjust the speed of a single-phase AC asynchronous motor, thereby achieving speed adjustment of the low-cost single-phase AC asynchronous motor within a certain range, maximizing the motor speed, matching the air conditioner speed with system parameters, better meeting the performance requirements of the air conditioner, and improving the user experience.

[0095] Figure 6 FIG. 1 is a flow chart of a method for controlling an air conditioner according to an embodiment of the present invention. The method for controlling an air conditioner according to the embodiment of the present invention at least includes steps S10 to S29.

[0096] Step S10, start.

[0097] Step S11, obtaining a set duty cycle and a set speed value corresponding to the set duty cycle.

[0098] In step S12, the air conditioner operates in a set mode.

[0099] Step S13, obtaining the indoor ambient temperature and the set temperature.

[0100] Step S14: calculating the absolute value of the difference between the indoor ambient temperature and the set temperature at every preset time.

[0101] Step S15: Determine whether the absolute value of the difference is less than a preset temperature threshold. If so, execute step S16; otherwise, execute step S13.

[0102] Step S16: Control the fan speed regulating chopper circuit to perform voltage chopping control.

[0103] Step S17: Obtain the outdoor coil temperature.

[0104] Step S18, cooling / dehumidification mode.

[0105] Step S19: When the outdoor coil temperature is within the first set temperature range, the fan speed regulating chopper circuit is controlled to operate at a first preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a first speed.

[0106] Step S20: When the outdoor coil temperature is within the second set temperature range, the fan speed regulating chopper circuit is controlled to operate at a second preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a second speed.

[0107] In step S21 , when the outdoor coil temperature is within a third set temperature range, the fan speed regulating chopper circuit is controlled to operate at a third preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a third speed.

[0108] Step S22: When the outdoor coil temperature is within a fourth set temperature range, the fan speed regulating chopper circuit is controlled to operate at a fourth preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a fourth speed.

[0109] Step S23: heating mode.

[0110] Step S24 , when the outdoor coil temperature is within the first set temperature range, the fan speed regulating chopper circuit is controlled to operate at a fourth preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a fourth speed.

[0111] Step S25 , when the outdoor coil temperature is within the second set temperature range, the fan speed regulating chopper circuit is controlled to operate at a third preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a third speed.

[0112] Step S26: When the outdoor coil temperature is within the third set temperature range, the fan speed regulating chopper circuit is controlled to operate at a second preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a second speed.

[0113] Step S27: When the outdoor coil temperature is within the fourth set temperature range, the fan speed regulating chopper circuit is controlled to operate at a first preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a first speed.

[0114] Step S28: Obtain the outdoor coil temperature at every preset time interval.

[0115] Step S29: Determine whether the absolute value of the difference is less than a preset temperature threshold. If so, execute step S18 or step S23; otherwise, execute step S11 and step S12.

[0116] In summary, the control method of the air conditioner provided according to the embodiment of the present invention includes: controlling the air conditioner to operate in a set mode, obtaining the indoor ambient temperature and the set temperature during the operation of the air conditioner, controlling the fan speed control chopper circuit of the air conditioner according to the indoor ambient temperature and the set temperature, and at the same time, obtaining the outdoor coil temperature, and adjusting the duty cycle of the fan speed control chopper circuit according to the outdoor coil temperature to adjust the speed of the single-phase AC asynchronous motor, thereby achieving speed adjustment of the low-cost single-phase AC asynchronous motor within a certain range, so that the motor speed is maximized, so that the speed of the air conditioner matches the system parameters, can better meet the performance requirements of the air conditioner, and improve the user experience.

[0117] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0118] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that: include: A refrigerant circulation loop, wherein the refrigerant performs a refrigeration cycle in a loop consisting of a compressor, a four-way valve, a condenser, a throttling assembly, and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger; An ambient temperature sensor is provided at the indoor air outlet of the air conditioner and is used to detect the indoor ambient temperature; An outdoor coil temperature sensor is provided on the outdoor heat exchanger and is used to detect the outdoor coil temperature; A single-phase AC asynchronous motor is provided in the outdoor unit and is used to adjust the speed according to the outdoor coil temperature when voltage chopping control is performed; A controller is connected to the single-phase AC asynchronous motor, and the controller is configured to: In response to a power-on control instruction, the air conditioner is controlled to operate in a set mode. During the operation of the air conditioner, an indoor ambient temperature and a set temperature are obtained, and a fan speed control chopper circuit of the air conditioner is controlled to operate according to the indoor ambient temperature and the set temperature. At the same time, an outdoor coil temperature is obtained, and a duty cycle of the fan speed control chopper circuit is adjusted according to the outdoor coil temperature to adjust the speed of the single-phase AC asynchronous motor.

2. The air conditioner according to claim 1, characterized in that When the fan speed regulating chopper circuit is controlled to perform voltage chopping control according to the indoor ambient temperature and the set temperature, the controller is configured as follows: Calculating the absolute value of the difference between the indoor ambient temperature and the set temperature at every preset time; When the absolute value of the difference is less than a preset temperature threshold, the fan speed regulating chopper circuit is controlled to perform voltage chopping control.

3. The air conditioner according to claim 1, wherein: When the duty cycle of the fan speed regulating chopper circuit is adjusted according to the outdoor coil temperature to adjust the speed of the single-phase AC asynchronous motor, the controller is configured as follows: When the outdoor coil temperature is within a first set temperature range, controlling the fan speed chopper circuit to operate at a first preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a first speed; When the outdoor coil temperature is within a second set temperature range, controlling the fan speed chopper circuit to operate at a second preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a second speed; When the outdoor coil temperature is within a third set temperature range, controlling the fan speed regulating chopper circuit to operate at a third preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a third speed; When the outdoor coil temperature is in a fourth set temperature range, the fan speed control chopper circuit is controlled to operate a fourth preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a fourth speed, wherein the first set temperature range is greater than the second set temperature range, the second set temperature range is greater than the third set temperature range, the third set temperature range is greater than the fourth set temperature range, the first speed is greater than the second speed, the second speed is greater than the third speed, the third speed is greater than the fourth speed, the first duty cycle is greater than the second duty cycle, the second duty cycle is greater than the third duty cycle, and the third duty cycle is greater than the fourth duty cycle.

4. The air conditioner according to claim 1, wherein: When the duty cycle of the fan speed regulating chopper circuit is adjusted according to the outdoor coil temperature to adjust the speed of the single-phase AC asynchronous motor, the controller is configured as follows: When the outdoor coil temperature is within the first set temperature range, controlling the fan speed regulating chopper circuit to operate at a fourth preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a fourth speed; When the outdoor coil temperature is within a second set temperature range, controlling the fan speed regulating chopper circuit to operate at a third preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a third speed; When the outdoor coil temperature is within a third set temperature range, controlling the fan speed regulating chopper circuit to operate at a second preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a second speed; When the outdoor coil temperature is in a fourth set temperature range, the fan speed control chopper circuit is controlled to operate a first preset duty cycle to adjust the speed of the single-phase AC asynchronous motor to a first speed, wherein the first set temperature range is greater than the second set temperature range, the second set temperature range is greater than the third set temperature range, the third set temperature range is greater than the fourth set temperature range, the first speed is greater than the second speed, the second speed is greater than the third speed, the third speed is greater than the fourth speed, the first duty cycle is greater than the second duty cycle, the second duty cycle is greater than the third duty cycle, and the third duty cycle is greater than the fourth duty cycle.

5. The air conditioner according to claim 1, characterized in that In the process of controlling the air conditioner to operate in the set mode, the controller is further configured to: Obtain a set duty cycle and a set speed value corresponding to the set duty cycle.

6. The air conditioner according to claim 1, characterized in that After adjusting the speed of the single-phase AC asynchronous motor, the controller is further configured to: The outdoor coil temperature is obtained at preset time intervals.

7. The air conditioner according to claim 1, wherein: The air conditioner further comprises: The fan speed regulating chopper circuit is connected to the controller and is used for performing duty cycle control according to the PWM pulse signal output by the controller.

8. The air conditioner according to claim 7, characterized in that The fan speed regulating chopper circuit comprises: The isolation circuit is connected to the single-phase AC asynchronous motor and is used to convert the PWM pulse signal output by the controller into an AC voltage signal.

9. The air conditioner according to claim 1, wherein: The single-phase AC asynchronous motor comprises: A high-voltage circuit, used to supply power to the single-phase AC asynchronous motor; A starting capacitor is connected to the high-voltage circuit and is used to start the single-phase AC asynchronous motor.

10. A method for controlling an air conditioner, characterized in that: include: The air conditioner is controlled to operate in a set mode, and during the operation of the air conditioner, an indoor ambient temperature and a set temperature are obtained, and a fan speed control chopper circuit of the air conditioner is controlled to operate according to the indoor ambient temperature and the set temperature. At the same time, an outdoor coil temperature is obtained, and a duty cycle of the fan speed control chopper circuit is adjusted according to the outdoor coil temperature to adjust the speed of the single-phase AC asynchronous motor.

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