Air conditioner and control method thereof

Abstract

The application discloses an air conditioner and a control method thereof. The air conditioner comprises a motor, and an air conditioner main machine configured to: after sending a speed starting signal to the motor, if a rotating speed signal fed back by the motor is not received within a first preset time length, a first handshake signal is sent to the motor; whether a fault signal fed back by the motor is received within a second preset time length is judged; wherein the fault signal is a rotating speed signal fed back by the motor to the air conditioner main machine after the first handshake signal is received, and used for representing a fault type; if the fault signal of the motor is received within the second preset time length, a fault type corresponding to the fault signal is inquired through a fault information table; and if the fault signal of the motor is not received within the second preset time length, it is determined that a control circuit of the motor is damaged. The application can realize the communication function between the motor and the air conditioner main machine without changing the connection structure of the motor and the air conditioner main machine, so that the air conditioner main machine can know the specific fault condition of the motor.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and in particular to an air conditioner and its control method. Background Technology

[0002] Currently, since the DC motor of the air conditioner fan and the air conditioner unit are usually from different manufacturers, there is no communication interface between the motor and the air conditioner unit. As a result, when the motor itself fails, the air conditioner unit can only know that the motor has failed, but cannot know the specific fault details. Summary of the Invention

[0003] This invention provides an air conditioner and its control method, which can realize the communication function between the motor and the air conditioner unit without changing the connection structure between the motor and the air conditioner unit, so that the air conditioner unit can obtain the specific fault status of the motor when the motor fails.

[0004] The air conditioner provided in the first embodiment of the present invention includes:

[0005] The motor used to drive the fan;

[0006] The air conditioning unit, which is connected to the motor, is configured as follows:

[0007] After sending a speed start signal to the motor, if no speed signal is received from the motor within a first preset time period, a first handshake signal is sent to the motor.

[0008] After sending a first handshake signal to the motor, it is determined whether a fault signal from the motor is received within a second preset time period; wherein, the fault signal is a speed signal that the motor feeds back to the air conditioning unit after receiving the first handshake signal, which is used to characterize the fault type;

[0009] If a fault signal of the motor is received within the second preset time period, the fault type corresponding to the fault signal is queried through a preset fault information table.

[0010] If no fault signal is received from the motor within the second preset time period, the fault type of the motor is determined to be damage to the motor control circuit.

[0011] The air conditioner provided in the second embodiment of the present invention further includes an air conditioning unit configured as follows:

[0012] When the second handshake signal sent by the motor is received, it is determined whether the second fault signal fed back by the motor is received within a third preset time period; wherein, the second fault signal is the speed signal fed back by the motor to the air conditioning unit after detecting that it has failed, which is used to characterize the fault type;

[0013] If the second fault signal is received from the motor within the third preset time period, the fault type corresponding to the second fault signal is queried through the preset fault information table.

[0014] If the second fault signal from the motor is not received within the third preset time period, the fault signal transmission is determined to have failed.

[0015] In the third embodiment of the present invention, the air conditioner, after sending a speed start signal to the motor, if no speed signal is received from the motor within a first preset time period, sends a first handshake signal to the motor, specifically as follows:

[0016] After sending a speed start signal to the motor, if no speed signal is received from the motor within a first preset time period, the first handshake signal is repeatedly sent to the motor several times.

[0017] In the fourth embodiment of the present invention, the first handshake signal is a pulse width modulation waveform with a preset encoding value.

[0018] In the fifth embodiment of the present invention, the second handshake signal is composed of pulse width modulation signals of different frequencies.

[0019] The sixth embodiment of the present invention provides a control method for an air conditioner, the air conditioner including a motor for driving a fan and an air conditioning unit; wherein the air conditioning unit is connected to the motor; the method is executed by the air conditioning unit, and the method includes:

[0020] After sending a speed start signal to the motor, if no speed signal is received from the motor within a first preset time period, a first handshake signal is sent to the motor.

[0021] After sending a first handshake signal to the motor, it is determined whether a fault signal from the motor is received within a second preset time period; wherein, the fault signal is a speed signal that the motor feeds back to the air conditioning unit after receiving the first handshake signal, which is used to characterize the fault type;

[0022] If a fault signal of the motor is received within the second preset time period, the fault type corresponding to the fault signal is queried through a preset fault information table.

[0023] If no fault signal is received from the motor within the second preset time period, the fault type of the motor is determined to be damage to the motor control circuit.

[0024] The air conditioner control method provided in the seventh embodiment of the present invention further includes:

[0025] When the second handshake signal sent by the motor is received, it is determined whether the second fault signal fed back by the motor is received within a third preset time period; wherein, the second fault signal is the speed signal fed back by the motor to the air conditioning unit after detecting that it has failed, which is used to characterize the fault type;

[0026] If the second fault signal is received from the motor within the third preset time period, the fault type corresponding to the second fault signal is queried through the preset fault information table.

[0027] If the second fault signal from the motor is not received within the third preset time period, the fault signal transmission is determined to have failed.

[0028] The control method for an air conditioner provided in the eighth embodiment of the present invention, wherein after sending a speed start signal to the motor, if no speed signal is received from the motor within a first preset time period, a first handshake signal is sent to the motor, specifically:

[0029] After sending a speed start signal to the motor, if no speed signal is received from the motor within a first preset time period, the first handshake signal is repeatedly sent to the motor several times.

[0030] The control method for an air conditioner provided in the ninth embodiment of the present invention includes a first handshake signal that is a pulse width modulation waveform with a preset encoding value.

[0031] The control method for an air conditioner provided in the tenth embodiment of the present invention includes a second handshake signal composed of pulse width modulation signals of different frequencies.

[0032] Compared with the prior art, the controller and control method provided in this embodiment have the following advantages:

[0033] After sending a speed start signal to the motor, if the air conditioning unit does not receive a speed signal from the motor within a first preset time period, it sends a first handshake signal to the motor. After sending the first handshake signal, the air conditioning unit determines whether it receives a fault signal from the motor within a second preset time period. The fault signal is the speed signal from the motor, which indicates the fault type, fed back to the air conditioning unit after receiving the first handshake signal. If the air conditioning unit receives the fault signal within the second preset time period, it queries a preset fault information table to determine the corresponding fault type. If the air conditioning unit does not receive the fault signal within the second preset time period, it determines that the motor fault type is a damaged motor control circuit. Therefore, by utilizing only the existing Vsp speed port and FG speed port of the air conditioning unit and motor, communication between the motor and the air conditioning unit can be achieved without changing the connection structure, allowing the air conditioning unit to obtain the specific fault information of the motor when a fault occurs. Attached Figure Description

[0034] Figure 1 This is a structural block diagram of an air conditioner control system provided in an embodiment of the present invention.

[0035] Figure 2 This is a control circuit diagram of an air conditioning unit provided in an embodiment of the present invention.

[0036] Figure 3 This is a control circuit diagram of a motor provided in an embodiment of the present invention.

[0037] Figure 4 This is a control flowchart of an air conditioning unit provided in an embodiment of the present invention.

[0038] Figure 5 This is a structural block diagram of another air conditioner control system provided in an embodiment of the present invention.

[0039] Figure 6 This is a control flowchart for the motor end provided in an embodiment of the present invention.

[0040] Figure 7 This is another control flowchart of the air conditioning unit provided in an embodiment of the present invention.

[0041] Figure 8 This is another control flowchart for the motor end provided in an embodiment of the present invention.

[0042] Figure 9 This is a flowchart illustrating a control method for an air conditioner according to an embodiment of the present invention.

[0043] Figure 10This is a flowchart illustrating another control method for an air conditioner provided in an embodiment of the present invention. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] See Figure 1 This is a structural block diagram of an air conditioner control system provided in an embodiment of the present invention.

[0049] The air conditioner provided in this embodiment of the invention includes a motor 10 for driving a fan 30 and an air conditioning unit 20; wherein, the motor 10 is connected to the air conditioning unit 20 via a 5-wire interface, and both the motor 10 and the air conditioning unit 20 are provided with a Vsp speed port, an FG speed port, a Vcc power port, a GND ground port, and a Vm drive power port. See also Figure 1The Vsp speed port of motor 10 is connected to the Vsp speed port of air conditioning unit 20, the FG speed port of motor 10 is connected to the FG speed port of air conditioning unit 20, the Vcc power port of motor 10 is connected to the Vcc power port of air conditioning unit 20, the GND ground port of motor 10 is connected to the GND ground port of air conditioning unit 20, and the Vm drive power port of motor 10 is connected to the Vm drive power port of air conditioning unit 20.

[0050] See Figure 2 The control circuit of the air conditioner unit 20 includes a control chip IC, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a diode V1, a first transistor V2, and a second transistor V3. The connection relationships of the various components in the control circuit of the air conditioner unit 20 are conventional techniques in this field; specific connection relationships can be found in [reference needed]. Figure 2 The control circuit of the air conditioner unit 20 shown will not be described in detail here.

[0051] In the prior art, the 5-wire universal port of the air conditioner motor 10 has the following functions: 1. Vsp speed port: The PWM signal emitted by the air conditioner unit 20, after passing through... Figure 2 The first transistor V2, as shown, performs current isolation amplification, and then a certain Vsp DC voltage is formed at the third capacitor C3. The air conditioner unit 20 can adjust the Vsp DC voltage by adjusting the duty cycle of the PWM signal. The motor 10 collects the Vsp DC voltage through the Vsp speed port connected to the air conditioner unit 20 as the speed input signal of the motor 10 to adjust the speed of the motor 10. 2. FG speed port: The motor 10 sends a speed signal through the FG speed port. The speed signal is generally a fixed number of square wave signals emitted by the motor 10 for one revolution. The air conditioner unit 20 can calculate the speed of the motor 10 by testing the frequency of the square wave signal. 3. Vcc power supply port: Power supply for the internal control circuit of the motor 10. 4. GND ground port: Ground port of the motor 10. 5. Vm drive power supply port: Drive power supply for the motor 10, used to power the power devices inside the motor 10.

[0052] It is worth noting that the motor 10 used in the current air conditioner has a complete anomaly detection and fault protection mechanism. Therefore, as long as the communication problem between the motor 10 and the air conditioning unit 20 can be solved, a fault in the motor 10 can be reported to the air conditioning unit 20. The inventors analyzed, for example... Figure 2 and Figure 3The control circuits of the motor 10 and the air conditioning unit 20 shown can be used in practical applications. The feedback line of the FG speed port can be reused as the physical circuit for communication between the motor 10 and the air conditioning unit 20. As long as the multiplexing control logic of the FG speed port of the motor 10 and the air conditioning unit 20 is upgraded synchronously, when the motor 10 and the air conditioning unit 20 enter a special fault handling mode, the FG speed port circuit can be reused to realize the communication between the motor 10 and the air conditioning unit 20. Thus, when the motor 10 fails and detects its own fault type, the fault type of the motor 10 is reported to the air conditioning unit 20.

[0053] Specifically, the air conditioning unit 20 is configured as follows:

[0054] After sending a speed start signal to the motor 10, if no speed signal is received from the motor 10 within a first preset time period, a first handshake signal is sent to the motor 10.

[0055] After sending the first handshake signal to the motor 10, it is determined whether a first fault signal is received from the motor 10 within a second preset time period; wherein, the first fault signal is a speed signal used to characterize the fault type fed back by the motor 10 to the air conditioning unit 20 after receiving the first handshake signal.

[0056] If a first fault signal is received from motor 10 within the second preset time period, the fault type corresponding to the first fault signal is queried through the preset fault information table.

[0057] If no first fault signal is received from the motor 10 within the second preset time period, the fault type of the motor 10 is determined to be damage to the motor 10 control circuit.

[0058] In the air conditioner provided in this embodiment of the invention, after the air conditioning unit 20 sends a speed start signal to the motor 10, if it does not receive a speed signal from the motor 10 within a first preset time period, it sends a first handshake signal to the motor 10. After sending the first handshake signal to the motor 10, the air conditioning unit 20 determines whether it receives a fault signal from the motor 10 within a second preset time period. The fault signal is a speed signal fed back by the motor 10 to the air conditioning unit 20 after receiving the first handshake signal, which is used to characterize the fault type. If the air conditioning unit 20 receives a fault signal from the motor 10 within the second preset time period, it queries the fault type corresponding to the fault signal through a preset fault information table. If the air conditioning unit 20 does not receive a fault signal from the motor 10 within the second preset time period, it determines that the fault type of the motor 10 is damage to the motor 10 control circuit. Therefore, by utilizing the original Vsp speed port and FG speed port of the host and motor 10, the communication function between the motor 10 and the air conditioning host 20 can be realized without changing the connection structure between the motor 10 and the air conditioning host 20, so that the air conditioning host 20 can obtain the specific fault status of the motor 10 when the motor 10 fails.

[0059] Specifically, the air conditioning unit 20 sends a speed start signal to the motor 10 via the Vsp speed port and waits for a first preset time. If the air conditioning unit 20 receives a speed signal from the motor 10 via the FG speed port, the air conditioning unit 20 operates in normal mode. If the air conditioning unit 20 does not receive a speed signal from the motor 10 via the FG speed port, the air conditioning unit 20 determines that the motor 10 is faulty, and at this time, the air conditioning unit 20 enters the motor fault handling mode. In the motor fault handling mode, the air conditioning unit 20 sends a special first handshake signal to the motor 10 via the Vsp speed port. After recognizing the special first handshake signal, the motor 10 enters the fault handling mode, and the FG speed port of the motor 10 outputs a first fault signal representing the fault type of the motor 10. At the same time, after receiving the first fault signal from the motor 10 via the FG speed port of the air conditioning unit 20, it queries the fault type corresponding to the first fault signal through a preset fault signal table. The air conditioning unit 20 reports the fault type of the motor 10 and returns to normal mode.

[0060] Specifically, the fault information table contains fault types corresponding to different fault signals.

[0061] For example, combined Figure 4The diagram shows a control flowchart of an air conditioner host provided in an embodiment of the present invention. The specific control flow of the air conditioner host 20 is as follows: A speed start signal is sent to the motor 10 (step S1a), and then step S2a is executed; it is determined whether a speed signal is received from the motor 10 within a first preset time period (step S2a). If yes, step S3a is executed; otherwise, step S4a is executed; the system operates in normal mode (step S3a), and monitoring continues to detect whether a speed signal is received from the motor 10; a first handshake signal is sent to the motor 10 (step S4a), and then step S5a is executed; it is determined whether a first fault signal is received from the motor 10 within a second preset time period (step S5a). If yes, step S6a is executed; otherwise, step S7a is executed; the fault type corresponding to the first fault signal is queried through a preset fault information table (step S6a), the process ends, and the system returns to normal operation mode. The fault type of the motor 10 is determined to be damage to the motor 10 control circuit (step S7a), the process ends, and the system returns to normal operation mode.

[0062] For example, combined Figure 5 The diagram shown is a control flowchart for the motor end provided in an embodiment of the present invention. The specific control flow of the motor 10 end is as follows: The motor 10 receives the first handshake signal sent by the air conditioning unit 20 (step S1b), and then executes step S2b; The motor 10 enters the fault handling mode, repeatedly sends the first fault signal to the air conditioning unit 20 several times (step S2b), and then executes step S3b; The motor 10 exits the fault handling mode and returns to the normal mode (step S3b), and the process ends.

[0063] It is worth noting that in normal mode, if the air conditioning unit 20 sends a speed start signal to the motor 10 through the Vsp speed port, and if the air conditioning unit 20's FG speed port does not receive a speed signal from the motor 10 within a first preset time period, it indicates that the motor 10 itself has detected a fault, such as overcurrent, overvoltage, or overheating. The motor 10's self-protection mechanism prevents its mechanical structure from rotating, thus preventing the feedback of a speed signal. Normally, the mechanical speed of the motor 10 and the speed signal fed back by its FG speed port should have a one-to-one correspondence. See [link to relevant documentation]. Figure 3If the Vsp speed port of motor 10 receives a special first handshake signal sent by the air conditioning unit 20, the speed signal fed back from the motor 10 control module to the FG speed port is not the actual speed of motor 10, but a fault communication signal in the form of a simulated normal mode speed signal, i.e., the first fault signal. Of course, only if the hardware of motor 10 itself is undamaged—at least the control module, drive module, and peripheral circuits of motor 10 are undamaged—can the first fault signal sent by motor 10 be received by the FG speed port of the air conditioning unit 20. Common high-voltage components of motor 10, such as the drive module, are prone to damage, while the feedback loop of motor 10 has a simple circuit structure and is not easily damaged. Therefore, even if the drive module fails, it will not affect the operation of the feedback loop. If both the control module and peripheral circuits of motor 10 are damaged, then only the air conditioning unit 20 can routinely diagnose the motor 10 fault, and it will be unable to determine the fault type.

[0064] See Figure 6 In one specific implementation, the air conditioner further includes a wireless communication module 40; wherein the air conditioner main unit 20 communicates with the cloud server through the wireless communication module 40; then, after querying the fault type corresponding to the first fault signal / second fault signal through a preset fault information table, the air conditioner main unit 20 is further used for:

[0065] The fault type of motor 10 is reported to the cloud server so that technicians can determine the fault type of motor 10.

[0066] For example, if the fault type of motor 10 is overcurrent fault, overvoltage fault, or overheating fault, the air conditioning unit 20 will reduce the load adaptation by lowering the Vsp signal output from the Vsp speed port and reducing the speed. If this is feasible but the speed cannot be normal for a long time, this situation can be distinguished by fault codes when reporting the fault. If the air conditioner is equipped with a wireless communication module 40 and has WIFI networking function, after determining the fault type of motor 10, the air conditioning unit 20 will report the fault type of motor 10 to the cloud server. Technicians will obtain the fault type and related information of motor 10 from the cloud server, make an early assessment and arrange on-site repair, guide the user to check the fault code on the indoor unit screen using the remote control, and after-sales personnel will assess the situation and arrange on-site repair.

[0067] Furthermore, the air conditioning unit 20 is also configured as follows:

[0068] When the second handshake signal sent by the motor 10 is received, it is determined whether the second fault signal fed back by the motor 10 is received within the third preset time period; wherein, the second fault signal is the speed signal fed back by the motor 10 to the air conditioning unit 20 after detecting that it has failed, which is used to characterize the fault type;

[0069] If the second fault signal is received from the motor 10 within the third preset time period, the fault type corresponding to the second fault signal is queried through the preset fault information table.

[0070] If no second fault signal is received from the motor 10 within the third preset time period, the fault signal transmission is determined to have failed.

[0071] For example, combined Figure 7 The diagram shows another control flowchart for the air conditioning unit provided in this embodiment of the invention. The specific control flow of the air conditioning unit 20 is as follows: It receives the second handshake signal sent by the motor 10 (step S1c), and then executes step S2c; it determines whether a second fault signal fed back by the motor 10 is received within a third preset time period (step S2c). If yes, it executes step S3c; otherwise, it executes step S4c; it queries the fault type corresponding to the second fault signal through a preset fault information table (step S3c), the process ends, and it returns to normal operation mode. It determines that the fault signal transmission failed (step S4c), the process ends, and it returns to normal operation mode.

[0072] For example, combined Figure 8 The diagram shown is another control flowchart for the motor end provided in this embodiment of the invention. The specific control flow for the motor 10 end is as follows: The motor 10 detects a fault and stops, enters the fault handling mode (step S1d), and then executes step S2d; The motor 10 repeatedly sends the second handshake signal to the air conditioning unit 20 several times (step S2d), and then executes step S3d; The motor 10 repeatedly sends the second fault signal to the air conditioning unit 20 several times (step S3d), and then executes step S4d; The motor 10 exits the fault handling mode and returns to the normal mode (step S4d), and the process ends.

[0073] Specifically, if motor 10 detects a fault and stops, it enters a fault handling mode. Motor 10 repeatedly sends a special second handshake signal to the air conditioning unit 20 several times via its FG speed port to ensure the air conditioning unit 20 receives the second handshake signal, and then returns to normal mode. After receiving the second handshake signal from motor 10, the air conditioning unit 20's FG speed port enters the motor fault handling mode. In this mode, the air conditioning unit 20 determines whether it has received a second fault signal from motor 10's FG speed port within a third preset time period. If it does, it queries a preset fault information table to determine the corresponding fault type, reports the fault type of motor 10, and returns to normal mode. If it does not receive the second fault signal from motor 10's FG speed port, it determines the fault signal transmission has failed, and returns to normal mode.

[0074] As one specific embodiment, if no speed signal is received from the motor 10 within a first preset time period after sending a speed start signal to the motor 10, a first handshake signal is sent to the motor 10, specifically as follows:

[0075] After sending a speed start signal to the motor 10, if no speed signal is received from the motor 10 within a first preset time period, the first handshake signal is repeatedly sent to the motor 10 several times.

[0076] Furthermore, the first handshake signal is a pulse width modulation waveform with a preset encoding value.

[0077] It is worth noting that in the actual design of the first handshake signal, the control signal logic of the normal speed signal of motor 10 should be avoided as much as possible. It can be understood that the speed of motor 10 generally does not change significantly in a short period of time. Theoretically, one speed corresponds to one Vsp voltage signal. Motor 10 can reach the target speed within a few seconds of starting, at which point the Vsp voltage signal is a stable voltage signal in motor 10. If the first handshake signal is designed as a pulse width modulation waveform with a special preset encoding value, such as a 1010 1010 pulse width modulation waveform, which translates to a high-low-high-low-high-low combination curve, this curve does not conform to the normal control logic of motor 10. Designing the first handshake signal as a pulse width modulation waveform with a preset encoding value can reduce the possibility of misjudgment to a certain extent.

[0078] Furthermore, the second handshake signal is composed of pulse width modulation signals of different frequencies.

[0079] For example, the second handshake signal can be composed of three frequency (speed) signals, such as 10.2K, 10.6K, and 11K. These three frequencies should be outside the normal speed frequency of motor 10. The second handshake signal is composed of three consecutive pulse width modulation signals of different frequencies, ensuring the specificity and uniqueness of the handshake signal. After a successful handshake, as long as motor 10 is in fault handling mode, the fault speed transmitted by motor 10 can be at any frequency without restriction. Therefore, both the fault information and the status information of motor 10 can be uploaded to the air conditioning unit 20. For example: Fault 1 - represents a specific speed of 100 r / m; Fault 2 - represents a specific speed of 150 r / m; Fault 3 - represents a specific speed of 200 r / m; Status 1 - represents a specific speed of 250 r / m; Status 2 - represents a specific speed of 300 r / m, etc.

[0080] Specifically, under normal circumstances, the signal fed back from the FG speed port is the feedback of the mechanical speed of motor 10, reflecting the actual speed of motor 10. The handshake signal is designed to establish communication between motor 10 and air conditioning unit 20. To ensure successful handshake and prevent misjudgments, it generally has special characteristics and needs to be distinguished from the normal mechanical speed frequency or physical logic of motor 10. It can be understood that the second handshake signal is a speed signal / pulse width modulation signal emitted by motor 10 at a special communication frequency outside the normal feedback frequency of motor 10 when motor 10 enters fault handling mode. In essence, it does not reflect the actual speed of motor 10. For example, using pulse width modulation signals at three consecutive speed frequencies of 10Hz, 100Hz, and 500Hz as the second handshake signal is more reliable because the actual speed of motor 10, due to physical limitations, would not have such a jump in speed frequency.

[0081] See Figure 9 This is a flowchart illustrating a control method for an air conditioner provided in an embodiment of the present invention.

[0082] The air conditioner control method provided in this embodiment includes an air conditioner comprising a motor for driving a fan and an air conditioning unit; wherein the air conditioning unit is connected to the motor; the method is executed by the air conditioning unit and includes the following steps:

[0083] S11. After sending a speed start signal to the motor, if no speed signal is received from the motor within a first preset time period, a first handshake signal is sent to the motor.

[0084] S12. After sending the first handshake signal to the motor, determine whether a first fault signal is received from the motor within a second preset time period; wherein, the first fault signal is a speed signal used to characterize the fault type fed back by the motor to the air conditioning unit after receiving the first handshake signal;

[0085] S13. If a first fault signal is received from the motor within the second preset time period, the fault type corresponding to the first fault signal is queried through a preset fault information table.

[0086] S14. If the first fault signal from the motor is not received within the second preset time period, the fault type of the motor is determined to be damage to the motor control circuit.

[0087] After the air conditioning unit sends a speed start signal to the motor, if it does not receive a speed signal from the motor within a first preset time period, it sends a first handshake signal to the motor. After sending the first handshake signal, the air conditioning unit determines whether it receives a fault signal from the motor within a second preset time period. The fault signal is the speed signal from the motor, which indicates the fault type, fed back to the air conditioning unit after receiving the first handshake signal. If the air conditioning unit receives the fault signal within the second preset time period, it queries a preset fault information table to determine the corresponding fault type. If the air conditioning unit does not receive the fault signal within the second preset time period, it determines that the motor fault type is a damaged motor control circuit. Therefore, by utilizing only the original Vsp speed port and FG speed port of the air conditioning unit and motor, communication between the motor and the air conditioning unit can be achieved without changing the connection structure, allowing the air conditioning unit to obtain the specific fault information of the motor when a fault occurs.

[0088] See Figure 10 As one optional embodiment, the method further includes the following steps:

[0089] S21. When the second handshake signal sent by the motor is received, it is determined whether the second fault signal fed back by the motor is received within a third preset time period; wherein, the second fault signal is the speed signal fed back by the motor to the air conditioning unit after detecting that it has failed, which is used to characterize the fault type;

[0090] S22. If the second fault signal fed back by the motor is received within the third preset time period, the fault type corresponding to the second fault signal is queried through the preset fault information table.

[0091] s23. If the second fault signal fed back by the motor is not received within the third preset time period, the fault signal transmission is determined to have failed.

[0092] As one specific embodiment, if no speed signal is received from the motor within a first preset time period after sending a speed start signal to the motor, a first handshake signal is sent to the motor, specifically as follows:

[0093] After sending a speed start signal to the motor, if no speed signal is received from the motor within a first preset time period, the first handshake signal is repeatedly sent to the motor several times.

[0094] Furthermore, the first handshake signal is a pulse width modulation waveform with a preset encoding value.

[0095] Furthermore, the second handshake signal is composed of pulse width modulation signals of different frequencies.

[0096] The specific description of the control method of the air conditioner provided in this embodiment can be found in the specific description of the various embodiments of the air conditioner described above, and will not be repeated here.

[0097] It should be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the accompanying drawings of the device embodiments provided by this invention, the connection relationships between modules indicate that they have communication connections, which can be specifically implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without any creative effort.

[0098] 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. An air conditioner, characterized in that, include: The motor used to drive the fan; The air conditioning unit, which is connected to the motor, is configured as follows: After sending a speed start signal to the motor, if no speed signal is received from the motor within a first preset time period, a first handshake signal is sent to the motor. After sending a first handshake signal to the motor, it is determined whether a first fault signal is received from the motor within a second preset time period; wherein, the first fault signal is a speed signal used to characterize the fault type fed back by the motor to the air conditioning unit after receiving the first handshake signal; If a first fault signal is received from the motor within the second preset time period, the fault type corresponding to the first fault signal is queried through a preset fault information table. If no first fault signal is received from the motor within the second preset time period, the fault type of the motor is determined to be damage to the motor control circuit. When the second handshake signal sent by the motor is received, it is determined whether the second fault signal fed back by the motor is received within a third preset time period; wherein, the second fault signal is the speed signal fed back by the motor to the air conditioning unit after detecting that it has failed, which is used to characterize the fault type; If the second fault signal is received from the motor within the third preset time period, the fault type corresponding to the second fault signal is queried through the preset fault information table. If the second fault signal from the motor is not received within the third preset time period, the fault signal transmission is determined to have failed.

2. The air conditioner as described in claim 1, characterized in that, If, after sending a speed start signal to the motor, no speed signal is received from the motor within a first preset time period, a first handshake signal is sent to the motor, specifically: After sending a speed start signal to the motor, if no speed signal is received from the motor within a first preset time period, the first handshake signal is repeatedly sent to the motor several times.

3. The air conditioner as described in claim 1, characterized in that, The first handshake signal is a pulse width modulation waveform with a preset encoding value.

4. The air conditioner as described in claim 1, characterized in that, The second handshake signal consists of pulse width modulation signals of different frequencies.

5. A control method for an air conditioner, characterized in that, The air conditioner includes a motor for driving a fan and an air conditioning unit; wherein the air conditioning unit is connected to the motor; the method is performed by the air conditioning unit, and the method includes: After sending a speed start signal to the motor, if no speed signal is received from the motor within a first preset time period, a first handshake signal is sent to the motor. After sending a first handshake signal to the motor, it is determined whether a first fault signal is received from the motor within a second preset time period; wherein, the first fault signal is a speed signal used to characterize the fault type fed back by the motor to the air conditioning unit after receiving the first handshake signal; If a first fault signal is received from the motor within the second preset time period, the fault type corresponding to the first fault signal is queried through a preset fault information table. If no first fault signal is received from the motor within the second preset time period, the fault type of the motor is determined to be damage to the motor control circuit. When the second handshake signal sent by the motor is received, it is determined whether a second fault signal fed back by the motor is received within a third preset time period; wherein, the second fault signal is a speed signal fed back by the motor to the air conditioning unit after detecting that it has malfunctioned, which is used to characterize the fault type: If the second fault signal is received from the motor within the third preset time period, the fault type corresponding to the second fault signal is queried through the preset fault information table. If the second fault signal from the motor is not received within the third preset time period, the fault signal transmission is determined to have failed.

6. The control method for an air conditioner as described in claim 5, characterized in that, If, after sending a speed start signal to the motor, no speed signal is received from the motor within a first preset time period, a first handshake signal is sent to the motor, specifically: After sending a speed start signal to the motor, if no speed signal is received from the motor within a first preset time period, the first handshake signal is repeatedly sent to the motor several times.

7. The control method for an air conditioner as described in claim 5, characterized in that, The first handshake signal is a pulse width modulation waveform with a preset encoding value.

8. The control method for an air conditioner as described in claim 5, characterized in that, The second handshake signal consists of pulse width modulation signals of different frequencies.

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