Fresh air air conditioner and fresh air pipe diameter identification method thereof

Abstract

This invention discloses a fresh air conditioner and a method for identifying the diameter of its fresh air duct. The fresh air conditioner is equipped with a fresh air device, which includes a fresh air duct, a fresh air fan, and a drive motor. The drive motor drives the fresh air fan to deliver outdoor air into the room through the fresh air duct. After detecting that the fresh air device has started, the system acquires the AC voltage, the real-time speed of the fresh air fan, and the motor parameters of the drive motor within a preset time period. The average values ​​of the AC voltage, real-time speed, and motor parameters are calculated. Based on the calculated average values ​​of the AC voltage, real-time speed, and motor parameters, the system searches for a target duct diameter corresponding to the current fresh air duct in a preset fresh air duct diameter database, and uses the target duct diameter as the diameter of the fresh air duct. Using this invention, the fresh air duct diameter can be automatically identified, improving automation and efficiency, enhancing user experience, and avoiding the problem of the air conditioner's control logic being affected by the inability to identify changes in duct diameter.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a fresh air air conditioner and a method for identifying the diameter of its fresh air duct. Background Technology

[0002] When installing a fresh air conditioning unit, the diameter of the fresh air duct can be changed. The fresh air duct that comes with the unit is a thin duct, which can be installed outdoors using the same air conditioning port. However, the fresh air volume of a thin duct is relatively small. In this case, the fresh air control logic set at the factory is for the thin duct, and the delivered fresh air volume will not be large due to the duct diameter limitation. If the user needs a larger fresh air volume, a thicker duct must be selected, requiring the existing air conditioning port to be enlarged before installation outdoors. After changing the fresh air duct diameter during installation, the existing fresh air conditioning unit cannot automatically recognize the change. This causes it to continue operating according to the fresh air control logic corresponding to the original duct diameter. For the air conditioning unit's fresh air control, it cannot know that the fresh air volume has changed, resulting in a mismatch between the delivered fresh air volume and the target fresh air volume. This, in turn, affects other control logic of the air conditioner, such as humidity and temperature control. Summary of the Invention

[0003] The purpose of this invention is to provide a fresh air air conditioner and a method for identifying the diameter of its fresh air duct, which can automatically identify the diameter of the fresh air duct without the need for manual intervention, thereby improving automation and efficiency.

[0004] To achieve the above objectives, embodiments of the present invention provide a fresh air air conditioner, comprising:

[0005] An indoor unit is used to regulate the temperature and humidity of indoor air, and the indoor unit includes an indoor fan;

[0006] The outdoor unit is connected to the indoor unit via a connecting pipe;

[0007] A fresh air device, installed in the outdoor unit or indoor unit, includes a fresh air duct, a fresh air fan and a drive motor, wherein the drive motor drives the fresh air fan to deliver outdoor air to the indoor unit through the fresh air duct;

[0008] The controller is used to acquire the AC voltage, real-time speed of the fresh air fan, and motor parameters of the drive motor detected within a preset time period after the fresh air device is detected to be started; calculate the average value of the AC voltage, real-time speed, and motor parameters; search for the target pipe diameter corresponding to the current fresh air duct in a preset fresh air duct diameter library based on the calculated average AC voltage, average real-time speed, and average motor parameters, and use the target pipe diameter as the pipe diameter of the fresh air duct.

[0009] As an improvement to the above solution, when the drive motor is a PG motor, the motor parameters are the drive delay time of the PG motor, the average value of the motor parameters is the average value of the drive delay time, and the fresh air duct diameter library records several sets of duct diameter parameters of the fresh air duct corresponding to different voltage ranges, fan speed ranges, and drive delay time ranges.

[0010] As an improvement to the above solution, when the drive motor is a PG motor, the fresh air air conditioner further includes:

[0011] The zero-crossing detection module is used to detect the time point when the input AC voltage crosses zero and sends this time point as a zero-crossing detection signal to the controller.

[0012] The PG motor drive module is used to generate a corresponding drive voltage based on the drive delay time, so as to generate a corresponding target speed to drive the PG motor to rotate.

[0013] The PG motor feedback module is used to detect the number of pulses when the PG motor is rotating, and send this number of pulses as the PG motor speed feedback signal to the controller;

[0014] The controller is also configured to: acquire a zero-crossing detection signal, a target speed, and a PG motor speed feedback signal, and adjust the drive delay time of the PG motor according to the zero-crossing detection signal, the target speed, and the PG motor speed feedback signal.

[0015] As an improvement to the above solution, when the drive motor is a DC motor, the motor parameters are the PWM duty cycle of the DC motor, the average value of the motor parameters is the average value of the PWM duty cycle, and the fresh air duct diameter library records several sets of fresh air duct diameter parameters corresponding to different voltage ranges, fan speed ranges, and PWM duty cycle ranges.

[0016] As an improvement to the above solution, when the drive motor is a DC motor, the fresh air air conditioner further includes:

[0017] A DC motor drive module is used to generate a corresponding set speed to drive the DC motor to rotate based on the corresponding drive voltage output by the PWM duty cycle.

[0018] The DC motor feedback module is used to detect the number of pulses when the DC motor is rotating, and send this number of pulses as a DC motor speed feedback signal to the controller;

[0019] The controller is further configured to: acquire the set speed and the DC motor speed feedback signal, and adjust the PWM duty cycle of the DC motor according to the set speed and the DC motor speed feedback signal.

[0020] To achieve the above objectives, this invention also provides a method for identifying the diameter of a fresh air duct in a fresh air conditioner. The fresh air conditioner is equipped with a fresh air device, which includes a fresh air duct, a fresh air fan, and a drive motor. The drive motor drives the fresh air fan to deliver outdoor air into the room through the fresh air duct. Therefore, the method for identifying the diameter of the fresh air duct includes:

[0021] After the fresh air device is detected to be activated, the AC voltage, the real-time speed of the fresh air fan, and the motor parameters of the drive motor are obtained within a preset time period.

[0022] Calculate the average values ​​of AC voltage, real-time speed, and motor parameters;

[0023] Based on the calculated average AC voltage, average real-time speed, and average motor parameters, the target pipe diameter corresponding to the current fresh air duct is searched in the preset fresh air duct diameter library, and the target pipe diameter is used as the pipe diameter of the fresh air duct.

[0024] As an improvement to the above solution, when the drive motor is a PG motor, the motor parameters are the drive delay time of the PG motor, the average value of the motor parameters is the average value of the drive delay time, and the fresh air duct diameter library records several sets of duct diameter parameters of the fresh air duct corresponding to different voltage ranges, fan speed ranges, and drive delay time ranges.

[0025] As an improvement to the above solution, when the drive motor is a PG motor, the method further includes:

[0026] Acquire the zero-crossing detection signal, the target speed of the PG motor, and the speed feedback signal of the PG motor;

[0027] The drive delay time of the PG motor is adjusted based on the zero-crossing detection signal, the target speed, and the PG motor speed feedback signal.

[0028] As an improvement to the above solution, when the drive motor is a DC motor, the motor parameters are the PWM duty cycle of the DC motor, the average value of the motor parameters is the average value of the PWM duty cycle, and the fresh air duct diameter library records several sets of fresh air duct diameter parameters corresponding to different voltage ranges, fan speed ranges, and PWM duty cycle ranges.

[0029] As an improvement to the above solution, when the drive motor is a DC motor, the method further includes:

[0030] Acquire the set speed and DC motor speed feedback signal of the DC motor;

[0031] The PWM duty cycle of the DC motor is adjusted according to the set speed and the DC motor speed feedback signal.

[0032] Compared to existing technologies, the fresh air conditioner and its fresh air duct diameter identification method disclosed in this invention feature a fresh air device on the air conditioner. This device includes a fresh air duct, a fresh air fan, and a drive motor. The drive motor drives the fresh air fan to deliver outdoor air into the room through the fresh air duct. Upon detecting the activation of the fresh air device, the system acquires the AC voltage, the real-time speed of the fresh air fan, and the motor parameters of the drive motor within a preset time period. The system calculates the average values ​​of the AC voltage, real-time speed, and motor parameters. Based on these calculated average values, the system searches a preset fresh air duct diameter database for a target duct diameter corresponding to the current fresh air duct, and uses this target duct diameter as the diameter of the fresh air duct. Using this invention, the fresh air duct diameter can be automatically identified, improving automation and efficiency, enhancing user experience, and avoiding the problem of unidentified duct diameter changes affecting the rest of the air conditioner's control logic. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the external structure of a fresh air air conditioner provided in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of a fresh air air conditioner with the fresh air device installed in the indoor unit, as provided in an embodiment of the present invention.

[0035] Figure 3 This is a schematic diagram of a fresh air air conditioner with the fresh air device installed in the outdoor unit, as provided in an embodiment of the present invention.

[0036] Figure 4 This is a schematic diagram showing the connection between the controller and other components in the fresh air conditioner provided in this embodiment of the invention;

[0037] Figure 5 This is another connection diagram of the controller and other components in the fresh air air conditioner provided in this embodiment of the invention;

[0038] Figure 6 This is a first working schematic diagram of the controller in the fresh air air conditioner provided in an embodiment of the present invention;

[0039] Figure 7 This is a second schematic diagram of the controller in the fresh air air conditioner provided in an embodiment of the present invention;

[0040] Figure 8 This is a third working schematic diagram of the controller in the fresh air air conditioner provided in the embodiment of the present invention;

[0041] Figure 9 This is a fourth working schematic diagram of the controller in the fresh air air conditioner provided in the embodiment of the present invention;

[0042] Figure 10This is a fifth working schematic diagram of the controller in the fresh air air conditioner provided in the embodiment of the present invention;

[0043] Figure 11 This is a flowchart of a method for identifying the diameter of a fresh air duct in a fresh air air conditioner, provided by an embodiment of the present invention.

[0044] Among them, 100 is the indoor unit; 200 is the outdoor unit; 11 is the compressor; 12 is the four-way valve; 13 is the condenser; 14 is the throttling device; 15 is the evaporator; 16 is the indoor fan; 17 is the outdoor fan; 18 is the indoor ambient temperature sensor; 19 is the outdoor ambient temperature sensor; 20 is the outdoor air inlet; 21 is the fresh air fan; 22 is the drive motor; and 23 is the indoor air outlet. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0047] 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 number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0049] See Figure 1 , Figure 1 This is a structural diagram of a fresh air conditioner provided in an embodiment of the present invention. The air conditioner in this embodiment includes an indoor unit 100 and an outdoor unit 200. The indoor unit 100 is used to regulate the temperature and humidity of the indoor air. The outdoor unit 200 is connected to the indoor unit 100 through a connecting pipe. The outdoor unit 200 is installed outdoors, and the indoor unit 100 is installed indoors.

[0050] See Figure 2 , Figure 2 This is another structural schematic diagram of an air conditioner provided in an embodiment of the present invention. The air conditioner includes a compressor 11, a four-way valve 12, a condenser 13, a throttling device 14, an evaporator 15, an indoor fan 16, an outdoor fan 17, an indoor ambient temperature sensor 18, an outdoor ambient temperature sensor 19, an outdoor air inlet 20, a fresh air fan 21, a drive motor 22, and an indoor air outlet 23. The evaporator 15, the indoor fan 16, and the indoor ambient temperature sensor 18 are mounted on the indoor unit, while the compressor 11, the four-way valve 12, the condenser 13, the throttling device 14, the outdoor fan 17, and the outdoor ambient temperature sensor 19 are mounted on the outdoor unit.

[0051] A fresh air system is installed in the outdoor unit 200 or the indoor unit 100 to deliver outdoor air into the room. Figure 2 The diagram shown is a schematic of the fresh air device installed in the indoor unit 100. Figure 3 The diagram shows the fresh air device installed on the outdoor unit 200. The fresh air device includes an outdoor air inlet 20, a fresh air fan 21, a drive motor 22, an indoor air outlet 23, and a fresh air duct (not shown in the figure). The drive motor 22 drives the fresh air fan 21 to deliver outdoor air from the outdoor air inlet 20, the fresh air duct, and the indoor air outlet 23 to the indoor unit through the fresh air duct.

[0052] For example, the fresh air conditioner described in this embodiment of the invention includes cooling and heating modes. In cooling mode, the refrigerant first passes through the compressor to become a high-pressure gas, then condenses and releases heat in the outdoor unit's heat exchanger (condenser) to become a high-pressure liquid. This high-pressure liquid then passes through a throttling device to become a low-temperature, low-pressure liquid. It then evaporates and absorbs heat in the indoor unit's heat exchanger (evaporator) to become a low-temperature, low-pressure gas, and finally returns to the compressor. In heating mode, the refrigerant first passes through the compressor to become a high-pressure gas, then condenses and releases heat in the indoor unit's heat exchanger (condenser) to become a high-pressure liquid. This high-pressure liquid then passes through a throttling device to become a low-temperature, low-pressure liquid. This low-temperature, low-pressure liquid then evaporates and absorbs heat in the outdoor unit's heat exchanger (evaporator) to become a low-temperature, low-pressure gas, and finally returns to the compressor. The refrigerant flow direction is different during cooling and heating. During cooling, it first flows through the outdoor unit's heat exchanger, where the outdoor unit acts as the condenser and the indoor unit as the evaporator. During heating, the refrigerant first flows through the indoor unit's heat exchanger, where the indoor unit acts as the condenser and the outdoor unit as the evaporator. When operating in cooling or heating mode, the fresh air conditioner uses a four-way valve to change the refrigerant flow. Without the four-way valve, the fresh air conditioner can only achieve either cooling or heating, and cannot switch between cooling and heating modes. This invention connects the aforementioned fresh air supply device installed on the top of the outdoor unit to the indoor environment, thereby achieving indoor fresh air supply.

[0053] The drive motor in the fresh air device described in this embodiment of the invention can be a PG motor or a DC motor.

[0054] A PG motor is a type of motor equipped with a Hall element. The Hall element is installed inside the motor. Under normal conditions, the Hall element outputs one or more pulse signals for each revolution of the fan. When the fan motor speed is high, the frequency of its output pulse signal is high; when the fan motor speed is low, the frequency of its output pulse signal is low. The output pulse signal is collected by a microcontroller, which then adjusts the working voltage of the PG motor by adjusting the conduction angle of the thyristor, thereby automatically controlling the fan speed.

[0055] A DC motor is a rotating electric machine that converts DC electrical energy into mechanical energy (DC motor) or mechanical energy into DC electrical energy (DC generator). Its speed regulation is mostly achieved through PWM (Pulse Width Modulation), which has three main modulation methods: bipolar, unipolar, and restricted unipolar. Different PWM methods result in different motor operating characteristics, switching losses in the main circuit, and safety considerations. Brushless DC motors (BLDCMs) typically employ a three-phase full-bridge main circuit structure, operating with three-phase six-state square wave control. In any state, two switching transistors are controlled by PWM. Its PWM modulation method is very similar to the H-bridge PWM modulation of DC motors, where both bridge arms are controlled simultaneously. The choice of PWM method for DC motor speed regulation depends on the technical specifications. DC servo control systems often use bipolar control to ensure the continuity of motor current and thus guarantee rapid motor response. For speed regulation systems, where the motor typically operates at high speeds and heavy loads, unipolar or restricted unipolar control can be chosen to minimize shoot-through faults in the main circuit and ensure high reliability. Meanwhile, the losses, thermal balance, and freewheeling feedback of bridge circuit power devices vary depending on the PWM method.

[0056] See Figure 4 , Figure 4 This is a schematic diagram showing the connection between the controller 101 and other components in a fresh air conditioner provided in this embodiment of the invention. The drive motor is a PG motor, and the controller 101 is connected to a voltage detection module 102, a zero-crossing detection module 103, a PG drive motor module 104, and a PG motor feedback module 105. Specifically, the voltage detection module 102 detects the AC voltage input to the fresh air conditioner; the zero-crossing detection module 103 detects the time point of the zero-crossing of the input AC voltage and sends this time point as a zero-crossing detection signal to the controller 101; the PG motor drive module 104 generates a corresponding drive voltage based on the drive delay time to generate a corresponding target speed to drive the PG motor to rotate; and the PG motor feedback module 105 detects the number of pulses during PG motor rotation and sends this number of pulses as a PG motor speed feedback signal to the controller 101.

[0057] See Figure 5 , Figure 5This is another connection diagram of the controller 101 and other components in the fresh air conditioner provided in this embodiment of the invention. In this case, the drive motor is a DC motor, and the controller 101 is connected to the voltage detection module 102, the DC motor drive module 106, and the DC motor feedback module 107. The DC motor drive module 106 is used to generate a corresponding set speed to drive the DC motor to rotate based on the corresponding drive voltage output according to the PWM duty cycle. The DC motor feedback module 107 is used to detect the number of pulses when the DC motor rotates and send this number of pulses as a DC motor speed feedback signal to the controller 101.

[0058] For example, the voltage detection module 102 can be integrated into the indoor unit control board of the air conditioner to detect the input AC voltage. Generally, indoor unit control boards do not have voltage detection modules. Another solution is to utilize the existing voltage detection module of the outdoor unit and obtain data from the outdoor unit's voltage detection module through communication between the indoor and outdoor units. This solution does not increase the cost, but it requires the outdoor unit to be powered on. This is because the outdoor unit does not need to be powered when the fresh air is turned on alone. In order to obtain voltage data, the outdoor unit needs to be powered on, resulting in a small increase in power consumption.

[0059] Specifically, the controller 101 is used to: after detecting that the fresh air device is started, acquire the AC voltage, the real-time speed of the fresh air fan and the motor parameters of the drive motor detected within a preset time period; calculate the average value of the AC voltage, the real-time speed and the motor parameters; search for the target pipe diameter corresponding to the current fresh air duct in the preset fresh air duct diameter library according to the calculated average value of AC voltage, the average value of real-time speed and the average value of motor parameters, and use the target pipe diameter as the pipe diameter of the fresh air duct.

[0060] For example, see Figure 6 , Figure 6 This is a first schematic diagram of the controller in a fresh air conditioner provided in an embodiment of the present invention. The controller 101 is used to execute steps S11 to S14:

[0061] S11. Determine whether the fresh air device has been activated. If yes, proceed to step S12; otherwise, repeat step S11.

[0062] It is worth noting that the fresh air air conditioner periodically performs a fresh air duct diameter identification operation (for example, once a week; if the fresh air duct diameter identification operation is performed every Saturday, then after the fresh air air conditioner is detected to be running on Saturday, step S12 will be executed. If the fresh air device is not started on Saturday, then the fresh air duct diameter identification operation can be performed only after the fresh air device is started, and then this detection cycle will be extended). Alternatively, the user can decide when to perform the operation (for example, if the user replaces the fresh air duct, then the control command of the fresh air air conditioner can be sent to perform the fresh air duct diameter identification operation, and the controller can start performing the fresh air duct diameter identification operation after receiving this control command).

[0063] In this embodiment of the invention, the fresh air air conditioner performs step S12 after the fresh air device is started and has been running for a period of time. At this time, the fresh air device has been running stably and the parameters obtained are relatively accurate.

[0064] S12. After detecting that the fresh air device has been started, obtain the AC voltage, the real-time speed of the fresh air fan and the motor parameters of the drive motor detected within a preset time period, and then proceed to step S13.

[0065] S13. Calculate the average values ​​of AC voltage, real-time speed and motor parameters, and then proceed to step S14.

[0066] S14. Based on the calculated average AC voltage, average real-time speed, and average motor parameters, search for the target pipe diameter corresponding to the current fresh air duct in the preset fresh air duct diameter library, and use the target pipe diameter as the pipe diameter of the fresh air duct.

[0067] For example, the fresh air duct diameter database pre-stores several sets of duct diameter parameters corresponding to different voltage ranges, fan speed ranges, and motor parameter ranges. Therefore, after obtaining the average AC voltage, the average real-time fan speed, and the average motor parameter, the target duct diameter corresponding to the current fresh air duct can be found in the fresh air duct diameter database without calculation; the database can be searched directly based on the parameters, resulting in fast duct diameter identification. After obtaining the fresh air duct diameter, the fresh air air conditioner can know that its fresh air delivery volume has changed, and can adaptively adjust the remaining control logic to ensure that the fresh air volume delivered to the room matches the target fresh air volume, preventing problems such as excessively high / low temperature or excessively high / low humidity.

[0068] Specifically, when the drive motor is a PG motor, the motor parameter is the drive delay time of the PG motor, the average value of the motor parameter is the average value of the drive delay time, and the fresh air duct diameter library records several sets of fresh air duct diameter parameters corresponding to different voltage ranges, fan speed ranges, and drive delay time ranges.

[0069] For example, participate Figure 7 , Figure 7 This is a second schematic diagram of the controller in a fresh air conditioner provided in an embodiment of the present invention. When the drive motor is a PG motor, the method for constructing the fresh air duct diameter library includes steps S201 to S211:

[0070] S201. Divide the AC voltage into several AC voltage ranges, and then proceed to step S202.

[0071] S202. Select one of the AC voltages to input into the fresh air conditioner, and then proceed to step S207.

[0072] For example, the input AC voltage can be zoned. For instance, it can be divided into several zones: below 150V, 150V-170V, 170V-190V, 190V-210V, 210V-230V, 230V-250V, 250V-270V, and above 270V. It's worth noting that household air conditioners use 220V AC mains power. Multiple voltage zones can be set here, even down to below 150V, because household voltage may be unstable, especially in remote areas or places with limited electricity.

[0073] S203. Select the diameter of several fresh air ducts in advance, and then proceed to step S204. For floor-standing air conditioners, there are generally 75cm / 30cm hole diameters, and for wall-mounted air conditioners, there are generally 25cm / 40cm hole diameters, etc.

[0074] S204. Select one of the fresh air duct diameters for installation, and then proceed to step S207.

[0075] S205. Pre-set the speed range of the PG motor, and then proceed to step S206. For example, it can be divided into ultra-low speed, low wind speed, medium wind speed, high wind speed, ultra-high speed, etc. The specific speed of each level can be set by the staff.

[0076] S206. Select one of the PG motor speeds to run at, and then proceed to step S207. For example, select one of the speeds in the ultra-low speed range.

[0077] S207. With the AC voltage, the diameter of the fresh air duct, and the speed of the PG motor all set, the drive delay time of the PG motor is detected, and then the process proceeds to steps S208, S209, and S210.

[0078] For example, the drive delay time is defined as a certain time delay after the PG motor receives the start command before turning on the SCR. By delaying the SCR's activation, the conduction angle of the SCR is controlled, and different conduction voltages are generated based on the conduction angle to drive the operation of the fresh air fan. For each voltage zone, the speed and pipe diameter are adjusted multiple times. For example, at 150V-170V, different speeds and pipe diameters are given, and the drive delay time of the PG motor is measured to obtain a reference range, which can be used as the drive delay time interval of the PG motor. With a larger pipe diameter, at the same speed, the fan intake and exhaust volume are greater, the fan performs more work, and the power is greater, which requires a higher fan drive voltage, and the drive delay time of the PG motor increases accordingly.

[0079] S208. Detect whether the voltage in the voltage range has been polled. If yes, proceed to step S211; otherwise, return to step S202. At this time, obtain the next AC voltage and input it into the fresh air conditioner.

[0080] S209. Check whether the diameter of the fresh air duct has been polled. If yes, proceed to step S211. Otherwise, return to step S204. At this time, install another fresh air duct with a different diameter.

[0081] S210. Detect whether the rotation speed in the specified speed range has been polled. If yes, proceed to step S211; otherwise, return to step S202. At this time, obtain the next speed and input it into the PG motor.

[0082] S211. After all parameters have been polled, establish the fresh air duct diameter library according to the correspondence of each parameter.

[0083] Specifically, when the drive motor is a PG motor, the controller is further configured to: acquire a zero-crossing detection signal, a target speed, and a PG motor speed feedback signal, and adjust the drive delay time of the PG motor according to the zero-crossing detection signal, the target speed, and the PG motor speed feedback signal.

[0084] For example, after obtaining the diameter of the fresh air duct, the drive delay time of the PG motor can be adjusted to make the control of the PG motor more reasonable. See also Figure 8 , Figure 8 This is a third schematic diagram of the controller in the fresh air conditioner provided in this embodiment of the invention. The controller is also used to execute steps S301 to S304:

[0085] S301. Obtain the zero-crossing detection signal, and then proceed to step S304.

[0086] S302. Obtain the target speed of the PG motor, and then proceed to step S304.

[0087] S303. Obtain the PG motor speed feedback signal, and then proceed to step S304.

[0088] S304. Adjust the drive delay time of the PG motor according to the zero-crossing detection signal, the target speed and the PG motor speed feedback signal.

[0089] For example, the PG motor is a combination of a single-phase AC motor and a speed sensor. The conduction time of the thyristor is controlled by utilizing the difference between the set rotational speed and the feedback from the speed sensor to achieve speed control. The PG motor drive software mainly includes three parts: a. an interrupt generated by a 50Hz mains zero-crossing detection pulse signal; b. input capture of the speed feedback signal; c. output comparison of the PG motor drive signal. For the PG motor hardware drive circuit design specifications, please refer to Q / HKK J02026-2009. This specification provides a detailed description of typical PG motor circuits, important node pulse waveforms, and key hardware parameters, which will not be repeated here.

[0090] Zero-crossing detection detects the moment when the 50Hz AC mains phase voltage is zero; this moment serves as the reference point for adjusting the phase delay. Utilizing the low-voltage cutoff characteristic of a transistor, the AC mains voltage is rectified in full-wave mode. When the voltage drops to a certain value, the transistor cuts off; when the voltage rises, it turns on again, generating periodic pulses. These pulses can be detected using the chip's interrupt pin. The width of the zero-crossing detection pulse can be adjusted by changing the resistance value of a specific voltage divider resistor.

[0091] The PG motor has a built-in speed sensor. A single-pulse motor emits one pulse per revolution, while a three-pulse motor emits three pulses per revolution. The rising or falling edge is detected by the chip's interrupt, and the timer calculates the time interval between two pulses to determine the motor speed. In practical applications, four consecutive pulses are typically collected and averaged. The motor speed is compared to a preset speed. If the speed is too high, the phase conduction delay is increased (i.e., the drive delay time is extended), thereby reducing the effective voltage of the motor and thus decreasing its speed; conversely, the speed is increased. The timer in the chip compares the internal clock with a preset value stored in a register. If they are equal, a specific pin will transition. Changing the set value in the register adjusts the phase conduction delay, thus controlling the motor speed. After a certain conduction time, the pin needs to be reset.

[0092] Specifically, when the drive motor is a DC motor, the motor parameters are the PWM duty cycle of the DC motor, the average value of the motor parameters is the average value of the PWM duty cycle, and the fresh air duct diameter library records several sets of fresh air duct diameter parameters corresponding to different voltage ranges, fan speed ranges, and PWM duty cycle ranges.

[0093] For example, see Figure 9 , Figure 9 This is a fourth working schematic diagram of the controller in the fresh air air conditioner provided in this embodiment of the invention. When the drive motor is a DC motor, the method for constructing the fresh air duct diameter library includes steps S401 to S411:

[0094] S401. Divide the AC voltage into several AC voltage ranges, and then proceed to step S402.

[0095] S402. Select one of the AC voltages to input into the fresh air conditioner, and then proceed to step S407.

[0096] For example, the input AC voltage can be zoned. For instance, it can be divided into several zones: below 150V, 150V-170V, 170V-190V, 190V-210V, 210V-230V, 230V-250V, 250V-270V, and above 270V. It's worth noting that household air conditioners use 220V AC mains power. Multiple voltage zones can be set here, even down to below 150V, because household voltage may be unstable, especially in remote areas or places with limited electricity.

[0097] S403. Select the diameter of several fresh air ducts in advance, and then proceed to step S404. For floor-standing air conditioners, there are generally 75cm / 30cm hole diameters, and for wall-mounted air conditioners, there are generally 25cm / 40cm hole diameters, etc.

[0098] S404. Select one of the fresh air duct diameters for installation, and then proceed to step S407.

[0099] S405. Pre-set the speed range of the DC motor, and then proceed to step S406. For example, it can be divided into ultra-low speed, low wind speed, medium wind speed, high wind speed, ultra-high speed, etc. The specific speed of each level can be set by the staff.

[0100] S406. Select one of the DC motor speeds to run at, and then proceed to step S407. For example, select one of the speeds in the ultra-low speed range.

[0101] S407. With the AC voltage, the diameter of the fresh air duct, and the speed of the DC motor all set, the PWM duty cycle of the DC motor is detected, and then the process proceeds to steps S408, S409, and S410.

[0102] For example, the PWM duty cycle differs for different fan speeds. The duty cycle for the same fan speed is not constant and fluctuates around the average value; therefore, a threshold range is set for the PWM duty cycle. With a larger pipe diameter, at the same fan speed, the fan intake and exhaust volume are greater, the fan performs more work, and the power is greater, which requires a higher fan drive voltage, and thus the PWM duty cycle increases accordingly.

[0103] S408. Detect whether the voltage in the voltage range has been polled. If yes, proceed to step S411; otherwise, return to step S402. At this time, obtain the next AC voltage and input it into the fresh air conditioner.

[0104] S409. Check if the diameter of the fresh air duct has been polled. If yes, proceed to step S411. Otherwise, return to step S404. At this time, install another fresh air duct with a different diameter.

[0105] S410. Detect whether the rotation speed in the specified speed range has been polled. If yes, proceed to step S411; otherwise, return to step S402. At this time, obtain the next speed and input it into the DC motor.

[0106] S411. After all parameters have been polled, establish the fresh air duct diameter library according to the correspondence of each parameter.

[0107] Specifically, when the drive motor is a DC motor, the controller is further configured to: acquire the set speed and the DC motor speed feedback signal, and adjust the PWM duty cycle of the DC motor according to the set speed and the DC motor speed feedback signal.

[0108] For example, after obtaining the diameter of the fresh air duct, the PWM duty cycle of the DC motor can be adjusted to make the control of the DC motor more reasonable. See also Figure 10 , Figure 10 This is a fifth operational schematic diagram of the controller in the fresh air conditioner provided in this embodiment of the invention. The controller is used to execute steps S501 to S503:

[0109] S501. Obtain the set speed of the DC motor, and then proceed to step S203.

[0110] S502. Obtain the DC motor speed feedback signal, and then proceed to step S203.

[0111] S503. Adjust the PWM duty cycle of the DC motor according to the set speed and the DC motor speed feedback signal.

[0112] Compared to existing technologies, the fresh air conditioner disclosed in this invention includes a fresh air device comprising a fresh air duct, a fresh air fan, and a drive motor. The drive motor drives the fresh air fan to deliver outdoor air into the room through the fresh air duct. Upon detecting the activation of the fresh air device, the system acquires the AC voltage, the real-time speed of the fresh air fan, and the motor parameters of the drive motor within a preset time period. The system calculates the average values ​​of the AC voltage, real-time speed, and motor parameters. Based on these calculated average values, the system searches a preset fresh air duct diameter database for a target duct diameter corresponding to the current fresh air duct, and uses this target duct diameter as the diameter of the fresh air duct. Using this invention, the fresh air duct diameter can be automatically identified, improving automation and efficiency, enhancing user experience, and avoiding the problem of undetected duct diameter changes affecting other control logic of the air conditioner.

[0113] See Figure 11 , Figure 11 This is a flowchart of a method for identifying the diameter of a fresh air duct in a fresh air conditioner according to an embodiment of the present invention. The method is implemented by a controller in a refrigerator. The fresh air conditioner is equipped with a fresh air device, which includes a fresh air duct, a fresh air fan, and a drive motor. The drive motor drives the fresh air fan to deliver outdoor air to the room through the fresh air duct. Therefore, the method for identifying the diameter of the fresh air duct includes:

[0114] S1. After detecting that the fresh air device has been activated, acquire the AC voltage, real-time speed of the fresh air fan, and motor parameters of the drive motor detected within a preset time period.

[0115] S2. Calculate the average values ​​of AC voltage, real-time speed, and motor parameters;

[0116] S3. Based on the calculated average AC voltage, average real-time speed, and average motor parameters, search for the target pipe diameter corresponding to the current fresh air duct in the preset fresh air duct diameter library, and use the target pipe diameter as the pipe diameter of the fresh air duct.

[0117] For example, the fresh air conditioner periodically performs a fresh air duct diameter identification operation (e.g., once a week; if the fresh air duct diameter identification operation is performed every Saturday, then after the fresh air conditioner is detected to be running on Saturday, the fresh air duct diameter identification operation will begin; if the fresh air device is not running on Saturday, then the fresh air duct diameter identification operation can be performed only after the fresh air device is running, and then this detection cycle will be extended). Alternatively, the user can decide when to perform the operation (e.g., if the user replaces the fresh air duct, then the fresh air conditioner can send a control command to perform the fresh air duct diameter identification operation, and the controller can start performing the fresh air duct diameter identification operation after receiving this control command). The fresh air conditioner performs the fresh air duct diameter identification operation after the fresh air device has been running for a period of time, at which point the fresh air device has been running stably and the obtained parameters are relatively accurate.

[0118] The fresh air duct diameter database pre-stores several sets of duct diameter parameters corresponding to different voltage ranges, fan speed ranges, and motor parameter ranges. Therefore, after obtaining the average AC voltage, the average real-time fan speed, and the average motor parameter, the target duct diameter corresponding to the current fresh air duct can be found in the database without calculation; the duct diameter can be identified directly based on the parameters, resulting in fast duct diameter recognition. Once the fresh air duct diameter is obtained, the fresh air air conditioner can detect that its fresh air delivery volume has changed and can adaptively adjust other control logic to ensure that the fresh air volume delivered to the room matches the target fresh air volume, preventing problems such as excessively high / low temperature or humidity.

[0119] Specifically, when the drive motor is a PG motor, the motor parameter is the drive delay time of the PG motor, the average value of the motor parameter is the average value of the drive delay time, and the fresh air duct diameter library records several sets of fresh air duct diameter parameters corresponding to different voltage ranges, fan speed ranges, and drive delay time ranges.

[0120] For example, the drive delay time is defined as a certain time delay after the PG motor receives the start command before turning on the SCR. By delaying the SCR's activation, the conduction angle of the SCR is controlled, and different conduction voltages are generated based on the conduction angle to drive the operation of the fresh air fan. For each voltage zone, the speed and pipe diameter are adjusted multiple times. For example, at 150V-170V, different speeds and pipe diameters are given, and the drive delay time of the PG motor is measured to obtain a reference range, which can be used as the drive delay time interval of the PG motor. With a larger pipe diameter, at the same speed, the fan intake and exhaust volume are greater, the fan performs more work, and the power is greater, which requires a higher fan drive voltage, and the drive delay time of the PG motor increases accordingly.

[0121] Specifically, when the drive motor is a PG motor, the method further includes:

[0122] Acquire the zero-crossing detection signal, the target speed of the PG motor, and the speed feedback signal of the PG motor;

[0123] The drive delay time of the PG motor is adjusted based on the zero-crossing detection signal, the target speed, and the PG motor speed feedback signal.

[0124] Specifically, when the drive motor is a DC motor, the motor parameters are the PWM duty cycle of the DC motor, the average value of the motor parameters is the average value of the PWM duty cycle, and the fresh air duct diameter library records several sets of fresh air duct diameter parameters corresponding to different voltage ranges, fan speed ranges, and PWM duty cycle ranges.

[0125] For example, the PWM duty cycle differs for different fan speeds. The duty cycle for the same fan speed is not constant and fluctuates around the average value; therefore, a threshold range is set for the PWM duty cycle. With a larger pipe diameter, at the same fan speed, the fan intake and exhaust volume are greater, the fan performs more work, and the power is greater, which requires a higher fan drive voltage, and thus the PWM duty cycle increases accordingly.

[0126] Specifically, when the drive motor is a DC motor, the method further includes:

[0127] Acquire the set speed and DC motor speed feedback signal of the DC motor;

[0128] The PWM duty cycle of the DC motor is adjusted according to the set speed and the DC motor speed feedback signal.

[0129] It is worth noting that the working process of the above-mentioned fresh air duct diameter identification method can refer to the working process of the controller in the fresh air air conditioner in the above embodiment, and will not be repeated here.

[0130] Compared to existing technologies, the fresh air duct diameter identification method for a fresh air air conditioner disclosed in this invention involves a fresh air device on the air conditioner, comprising a fresh air duct, a fresh air fan, and a drive motor. The drive motor drives the fresh air fan to deliver outdoor air into the room through the fresh air duct. Upon detecting the activation of the fresh air device, the method acquires the AC voltage, the real-time speed of the fresh air fan, and the motor parameters of the drive motor within a preset time period. The method calculates the average values ​​of the AC voltage, real-time speed, and motor parameters. Based on these calculated average values, the method searches for a target duct diameter corresponding to the current fresh air duct in a preset fresh air duct diameter database, and uses this target duct diameter as the diameter of the fresh air duct. Using this invention, the fresh air duct diameter can be automatically identified, improving automation and efficiency, enhancing user experience, and avoiding the problem of unidentified duct diameter changes affecting other control logic of the air conditioner.

[0131] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A fresh air conditioner characterized by comprising: The application relates to a new air conditioner, which comprises the following parts: an indoor unit for adjusting the temperature and humidity of indoor air, wherein the indoor unit comprises an indoor fan; an outdoor unit connected with the indoor unit through a connection pipe; a fresh air device arranged in the outdoor unit or the indoor unit, which comprises a fresh air pipe, a fresh air fan and a driving motor, wherein the driving motor drives the fresh air fan to deliver outdoor air into the room through the fresh air pipe; when the driving motor is a PG motor, the motor parameter is the driving delay time of the PG motor, the average value of the motor parameter is the average value of the driving delay time, and the fresh air pipe diameter library records a plurality of groups of pipe diameter parameters of the fresh air pipe corresponding to different voltage intervals, fan rotating speed intervals and driving delay time intervals; a controller for acquiring the detected alternating voltage, the real-time rotating speed of the fresh air fan and the motor parameter of the driving motor within a preset time period after detecting the start of the fresh air device; calculating the average values of the alternating voltage, the real-time rotating speed and the motor parameter; and searching for a target pipe diameter corresponding to the current fresh air pipe in a preset fresh air pipe diameter library according to the calculated average values of the alternating voltage, the real-time rotating speed and the motor parameter, and taking the target pipe diameter as the pipe diameter of the fresh air pipe.

2. The fresh air conditioner of claim 1, wherein, When the driving motor is a PG motor, the new air conditioner further comprises: a zero-crossing detection module for detecting the time point of the zero-crossing point of the input alternating voltage, and sending the time point as a zero-crossing detection signal to the controller; a PG motor driving module for generating a corresponding driving voltage according to the driving delay time, so as to generate a corresponding target rotating speed to drive the PG motor to rotate; a PG motor feedback module for detecting the pulse number of the PG motor during rotation, and sending the pulse number as a PG motor rotating speed feedback signal to the controller; the controller is further used for acquiring the zero-crossing detection signal, the target rotating speed and the PG motor rotating speed feedback signal, and adjusting the driving delay time of the PG motor according to the zero-crossing detection signal, the target rotating speed and the PG motor rotating speed feedback signal.

3. The fresh air conditioner according to claim 1, wherein When the driving motor is a direct current motor, the motor parameter is the PWM duty cycle of the direct current motor, the average value of the motor parameter is the average value of the PWM duty cycle, and the fresh air pipe diameter library records a plurality of groups of pipe diameter parameters of the fresh air pipe corresponding to different voltage intervals, fan rotating speed intervals and PWM duty cycle intervals.

4. The fresh air conditioner according to claim 3, wherein When the driving motor is a direct current motor, the new air conditioner further comprises: a direct current motor driving module for generating a corresponding driving voltage according to the PWM duty cycle, so as to generate a corresponding set rotating speed to drive the direct current motor to rotate; a direct current motor feedback module for detecting the pulse number of the direct current motor during rotation, and sending the pulse number as a direct current motor rotating speed feedback signal to the controller; the controller is further used for acquiring the set rotating speed and the direct current motor rotating speed feedback signal, and adjusting the PWM duty cycle of the direct current motor according to the set rotating speed and the direct current motor rotating speed feedback signal.

5. A fresh air pipe diameter identification method of a fresh air conditioner, characterized in that, The fresh air conditioner is provided with a fresh air device, the fresh air device includes a fresh air pipe, a fresh air fan and a driving motor, the driving motor drives the fresh air fan to deliver outdoor air to indoor through the fresh air pipe; when the driving motor is a PG motor, the motor parameter is the driving delay time of the PG motor, the average value of the motor parameter is the average value of the driving delay time, the fresh air pipe diameter library records a plurality of groups of corresponding pipe diameter parameters of the fresh air pipe in different voltage intervals, fan speed intervals and driving delay time intervals; the fresh air pipe diameter identification method includes: After detecting that the fresh air device is started, the AC voltage, the real-time speed of the fresh air fan and the motor parameter of the driving motor detected in a preset time period are acquired; The average values of the AC voltage, the real-time speed and the motor parameter are calculated; According to the calculated average values of the AC voltage, the real-time speed and the motor parameter, the target pipe diameter corresponding to the current fresh air pipe in the preset fresh air pipe diameter library is searched, and the target pipe diameter is taken as the pipe diameter of the fresh air pipe. 6.The fresh air duct diameter identification method of the fresh air conditioner of claim 5, wherein, When the driving motor is a PG motor, the method further includes: Acquire the zero-crossing detection signal, the target speed of the PG motor and the PG motor speed feedback signal; According to the zero-crossing detection signal, the target speed and the PG motor speed feedback signal, the driving delay time of the PG motor is adjusted. 7.The fresh air duct diameter identification method of the fresh air conditioner of claim 5, wherein, When the driving motor is a DC motor, the motor parameter is the PWM duty cycle of the DC motor, the average value of the motor parameter is the average value of the PWM duty cycle, and the fresh air pipe diameter library records a plurality of groups of corresponding pipe diameter parameters of the fresh air pipe in different voltage intervals, fan speed intervals and PWM duty cycle intervals. 8.The fresh air duct diameter identification method of the fresh air conditioner of claim 7, wherein, When the driving motor is a DC motor, the method further includes: Acquire the set speed of the DC motor and the DC motor speed feedback signal; According to the set speed and the DC motor speed feedback signal, the PWM duty cycle of the DC motor is adjusted.

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