Air conditioner, headwind-resistant protection method and device thereof and storage medium

Abstract

The invention discloses an air conditioner, a headwind-resistant protection method and device of the air conditioner and a storage medium. The method comprises the steps that the current running state of the air conditioner is obtained; if it is determined that the air conditioner is in the target state, the reverse rotation speed of an outdoor fan of the air conditioner is obtained; and performing protection control on the outdoor fan based on the reverse rotation speed of the outdoor fan. Therefore, when the outdoor fan does not run, the outdoor fan can be protected and controlled based on the reverse rotation speed of the outdoor fan, hardware damage such as motor demagnetization caused by reverse rotation of the motor of the outdoor fan under the action of external wind force can be effectively avoided, and the service life of the air conditioner is prolonged.

Description

Technical Field

[0001] The present application relates to the field of air conditioning, and in particular to an air conditioner and an anti-adverse wind protection method, device and storage medium thereof. Background Art

[0002] Since the outdoor fan of the air conditioner is installed outdoors, when there is a strong wind environment outside, the outdoor fan will reverse due to the influence of the external wind force, which will affect the normal startup or normal operation of the outdoor fan.

[0003] In the related technology, the air conditioner is often designed with anti-headwind start and anti-headwind operation functions. However, when the typhoon wind force level is high (i.e. the typhoon wind speed is high) and the speed of the outdoor fan of the air conditioner reverses against the wind reaches a certain level, the outdoor fan will fail to start, or the outdoor fan will be disturbed by the typhoon during operation and shut down due to protection such as stalling or overcurrent. At this time, the air conditioner will stop the anti-headwind start and report an anti-headwind start failure fault, or report a protection fault. After that, the outdoor fan is allowed to reverse under the external wind interference of the typhoon in the shutdown state, which may cause damage to the motor of the outdoor fan and affect the service life of the air conditioner. Summary of the invention

[0004] In view of this, an embodiment of the present application provides an air conditioner and a method, device and storage medium for protecting the air conditioner against headwind, aiming to effectively protect the outdoor fan of the air conditioner in headwind scenarios and extend the service life of the air conditioner.

[0005] The technical solution of the embodiment of the present application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a method for protecting an air conditioner from adverse winds, comprising:

[0007] Get the current operating status of the air conditioner;

[0008] If it is determined that the air conditioner is in the target state, obtaining the reverse rotation speed of the outdoor fan of the air conditioner;

[0009] Based on the reverse rotation speed of the outdoor fan, protection control is performed on the outdoor fan.

[0010] In some embodiments, the protection control of the outdoor fan based on the reverse rotation speed of the outdoor fan includes:

[0011] comparing the reverse rotation speed with a first rotation speed threshold;

[0012] If it is determined that the reverse rotation speed is greater than the first rotation speed threshold, controlling the outdoor fan to increase the anti-headwind rotation speed at a set acceleration until an exit condition is met;

[0013] Wherein, the anti-headwind rotation speed and the reverse rotation speed have opposite rotation directions.

[0014] In some embodiments, controlling the outdoor fan to increase the anti-headwind speed at a set acceleration until an exit condition is met includes:

[0015] Controlling the outdoor fan to increase the anti-headwind speed at a set acceleration, and counting the acceleration time of increasing the anti-headwind speed and / or the cumulative speed value of the anti-headwind speed;

[0016] Comparing the reverse rotation speed of the outdoor fan during the process of increasing the anti-headwind rotation speed with a second rotation speed threshold, the second rotation speed threshold being less than the first rotation speed threshold;

[0017] If the reverse speed is less than or equal to the second speed threshold, stop driving the outdoor fan and return to the comparison of the reverse speed and the first speed threshold; or, determine that the reverse speed is greater than the second speed threshold and the acceleration time is greater than or equal to the set time threshold and / or the accumulated speed value is greater than or equal to the first speed threshold, then stop driving the outdoor fan and disconnect the power supply circuit of the motor winding of the outdoor fan.

[0018] In some embodiments, the method further comprises:

[0019] The set time threshold is determined based on the first rotation speed threshold and the set acceleration.

[0020] In some embodiments, during the process of increasing the anti-headwind rotation speed, the method further comprises:

[0021] If it is determined that the reverse rotation speed is greater than a third rotation speed threshold, stopping driving the outdoor fan and disconnecting a power supply circuit of the motor winding of the outdoor fan;

[0022] The third speed threshold is greater than the first speed threshold.

[0023] In some embodiments, the protecting and controlling the outdoor fan based on the reverse rotation speed of the outdoor fan further includes:

[0024] If it is determined that the reverse rotation speed is less than or equal to the first rotation speed threshold and greater than a fourth rotation speed threshold, controlling the air conditioner to switch to the first mode;

[0025] Among them, the fourth speed threshold is smaller than the first speed threshold, and in the first mode, the air conditioner does not support anti-headwind startup based on a power-on instruction.

[0026] In some embodiments, the protecting and controlling the outdoor fan based on the reverse rotation speed of the outdoor fan further includes:

[0027] If it is determined that the reverse rotation speed is less than or equal to the fourth rotation speed threshold, controlling the air conditioner to switch to the second mode;

[0028] Among them, in the second mode, the air conditioner supports anti-headwind startup based on a power-on instruction.

[0029] In a second aspect, an embodiment of the present application provides an air conditioner anti-adverse wind protection device, comprising:

[0030] A first acquisition module, used to acquire the current operating state of the air conditioner;

[0031] A second acquisition module, for acquiring a reverse rotation speed of an outdoor fan of the air conditioner if it is determined that the air conditioner is in a target state;

[0032] A protection control module is used to perform protection control on the outdoor fan based on the reverse rotation speed of the outdoor fan.

[0033] In a third aspect, an embodiment of the present application provides an air conditioner, comprising: a processor and a memory for storing a computer program that can be run on the processor, wherein the processor, when used to run the computer program, executes the steps of the method described in the first aspect of the embodiment of the present application.

[0034] In some embodiments, the air conditioner includes an outdoor fan and a power supply circuit for supplying power to a motor winding of the outdoor fan, and a switch device for switching an on-off state is provided on the power supply circuit.

[0035] In a fourth aspect, an embodiment of the present application provides a storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the steps of the method described in the first aspect of the embodiment of the present application are implemented.

[0036] The technical solution provided by the embodiment of the present application obtains the current operating state of the air conditioner; if it is determined that the air conditioner is in the target state, the reverse rotation speed of the outdoor fan of the air conditioner is obtained; based on the reverse rotation speed of the outdoor fan, the outdoor fan is protected and controlled. In this way, when the outdoor fan is not running, the outdoor fan can be protected and controlled based on the reverse rotation speed of the outdoor fan, which can effectively avoid the hardware damage such as motor demagnetization caused by the reverse rotation of the outdoor fan under the action of external wind force, thereby extending the service life of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of a flow chart of a method for protecting an air conditioner against adverse winds according to an embodiment of the present application;

[0038] Figure 2A schematic diagram of a control circuit of an outdoor unit of an air conditioner in an application example of the present application;

[0039] Figure 3 A flowchart of a method for protecting an air conditioner against adverse winds in an application example of the present application;

[0040] Figure 4 This is a schematic diagram of the structure of the air conditioner anti-adverse wind protection device according to the embodiment of the present application;

[0041] Figure 5 This is a schematic diagram of the structure of the air conditioner according to the embodiment of the present application. DETAILED DESCRIPTION

[0042] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0044] In order to effectively ensure the operational reliability of the air conditioner under the influence of typhoon external forces, relevant technologies often design the air conditioner with related anti-headwind start-up and anti-headwind operation functions. For example, before the air conditioner is started, it is determined that the outdoor fan is reversed, so the outdoor fan can be controlled to enter the braking mode first, and then the outdoor fan is controlled to enter the normal start-up mode after the outdoor fan brakes and stops. During the operation of the air conditioner, the speed of the outdoor fan can be controlled based on the forward speed regulation mode, so as to maintain the speed of the outdoor fan stable.

[0045] However, when the typhoon wind force level is high (i.e. the typhoon wind speed is high), causing the speed of the outdoor fan of the air conditioner to reverse against the wind to reach a certain level, the outdoor fan will fail to start, or the outdoor fan will be disturbed by the typhoon during operation and will stall, overcurrent and other protection shutdowns. At this time, the air conditioner will stop the anti-adverse wind start and report the anti-adverse wind start failure fault, or report a protection fault. After that, the outdoor fan will be allowed to reverse under the external wind interference of the typhoon in the shutdown state. Since the motor of the outdoor fan is in the reverse power generation state at this time, when the reverse speed reaches a certain level (such as 2000rpm (revolutions / minute)), the current generated on the motor coil may exceed the demagnetization current of the motor, thereby causing damage to the motor, or bringing other reliability problems and safety hazards.

[0046] Based on this, the embodiment of the present application provides a method for protecting an air conditioner from adverse winds, and the air conditioner is used to adjust the temperature, humidity, etc. of the environment. The air conditioner can be a cooling-only air conditioner or a cooling-heating dual-purpose air conditioner, and the air conditioner can be a wall-mounted air conditioner, a cabinet air conditioner, a window air conditioner, or a ceiling air conditioner, and the air conditioner can be a single air conditioner or a multi-connected air conditioner unit, which is not specifically limited in the embodiment of the present application.

[0047] For example, the embodiment of the present application provides a method for protecting an air conditioner from adverse winds, such as Figure 1 As shown, the protection method includes:

[0048] Step 101, obtaining the current operating status of the air conditioner.

[0049] It is understandable that the types of operating states of the air conditioner may include: standby state, normal operating state and fault protection shutdown state. Among them, the standby state refers to the state in which the air conditioner is powered on and is waiting for the power-on command to start; the normal operating state refers to the operating state of the air conditioner after it is started based on the power-on command; the fault protection shutdown state refers to the fault protection that is started when the air conditioner fails to start or stalls due to typhoon interference during operation, overcurrent, etc., generates a fault protection flag and stops the operation of the air conditioner.

[0050] It can be understood that the control device of the air conditioner can determine the current operating state of the air conditioner based on the identification information indicating the operating state of the air conditioner.

[0051] Step 102: If it is determined that the air conditioner is in the target state, the reverse rotation speed of the outdoor fan of the air conditioner is obtained.

[0052] Here, the target state refers to the state in which the outdoor fan of the air conditioner is not running. For example, the target state can be the aforementioned standby state or fault protection shutdown state. If the control device of the air conditioner determines that the air conditioner is in the standby state or the fault protection shutdown state, it indicates that the outdoor fan of the air conditioner is in the shutdown state, that is, the outdoor fan is not started. At this time, the outdoor fan may still rotate against the wind (i.e., reverse), and the main reason is related to the environmental wind force. For example, at the seaside or plateau areas with strong winds, the outdoor fan will be driven to rotate against the wind under the interference of external wind force. Among them, the counterwind rotation refers to the rotation of the blades of the outdoor fan in the opposite direction to the normal working direction. For example, the blades rotate clockwise when working normally. If the blades rotate counterclockwise, the outdoor fan rotates against the wind, and the rotation speed at this time is the reverse rotation speed of the outdoor fan.

[0053] For example, the control device of the air conditioner can first determine whether the outdoor fan is rotating against the wind, and then obtain the reverse speed of the outdoor fan; or, the control device of the air conditioner can obtain the speed of the outdoor fan and determine whether the outdoor fan is rotating against the wind based on the speed. If so, the speed is used as the reverse speed of the outdoor fan.

[0054] In an application example, the fan speed can be obtained by the phase current in the fan motor, and then the fan speed can be used to determine whether it is rotating against the wind. In this case, the reverse speed of the outdoor fan of the air conditioner is obtained, including:

[0055] Obtain the phase current of the outdoor fan of the air conditioner;

[0056] According to the phase current, the back electromotive force generated by the outdoor fan when rotating is calculated;

[0057] determining the rotation direction of the outdoor fan according to the back electromotive force;

[0058] If the rotation direction is reverse, the fan speed of the outdoor fan is obtained and used as the reverse rotation speed.

[0059] Here, the phase current refers to the current flowing through each phase load in the three-phase power supply of the outdoor fan. Specifically, the air conditioner can detect the phase current through a current detection unit arranged in the outdoor fan, or can read the parameters of the three-phase power supply to obtain the phase current.

[0060] Here, the back electromotive force refers to the terminal voltage between two phases of the outdoor fan when the outdoor fan of the air conditioner is not started. Exemplarily, the back electromotive force may include the voltage between the U direction and the V direction in the three phases, and the voltage between the U direction and the W direction in the three phases. The air conditioner can calculate the back electromotive force based on the phase current and the resistance parameters on each phase, or the air conditioner can also directly detect the back electromotive force through a preset electromotive force detection unit.

[0061] Here, the rotation direction refers to the direction in which the outdoor fan rotates, which can be represented by clockwise or counterclockwise, or by forward or reverse. When the rotation direction is represented by forward and reverse, forward refers to the rotation direction when the fan is working normally, and reverse refers to the rotation direction opposite to forward. If the rotation direction is reverse, since the outdoor fan of the air conditioner is not currently started, the outdoor fan is in a state of rotating against the wind.

[0062] Exemplarily, the rotation angle θ of the outdoor fan can be obtained by conversion based on the back electromotive force of the outdoor fan, and the rotation angle θ is derived with respect to time, and the rotation direction of the outdoor fan is determined according to the positive or negative value of the derivative result. If the derivative result is negative, it means that the angle of rotation of the outdoor fan per unit time is a negative angle, that is, the direction of the angle is opposite to the direction of normal rotation of the outdoor fan, so the rotation direction of the outdoor fan is reversed. On the contrary, if the derivative result is positive, it means that the angle of rotation of the outdoor fan per unit time is a positive angle, that is, the direction of the angle is the same as the direction of normal rotation of the outdoor fan, so the rotation direction of the outdoor fan is forward.

[0063] Here, the fan speed refers to the rotation speed of the outdoor fan. The fan speed can be expressed by the number of rotations of the fan per unit time. For example, the fan speed can be the number of rotations of the fan per minute or the number of rotations of the fan per second.

[0064] It is understandable that the control device of the air conditioner determines the rotation direction according to the derivative result of the rotation angle θ, and the derivative result is the fan speed. Therefore, if the derivative result obtained is negative, the air conditioner can use the absolute value of the derivative result as the fan speed. Alternatively, the air conditioner can also detect the fan speed in other ways, which is not limited in the embodiments of the present application.

[0065] Step 103: Perform protection control on the outdoor fan based on the reverse rotation speed of the outdoor fan.

[0066] It can be understood that the embodiment of the present application can perform protection control on the outdoor fan based on the reverse speed of the outdoor fan when the outdoor fan is not running, which can effectively avoid hardware damage such as motor demagnetization caused by the reversal of the outdoor fan motor under the action of external wind force, thereby extending the service life of the air conditioner.

[0067] Exemplarily, the protecting and controlling the outdoor fan based on the reverse rotation speed of the outdoor fan includes:

[0068] comparing the reverse rotation speed with a first rotation speed threshold;

[0069] If it is determined that the reverse rotation speed is greater than the first rotation speed threshold, controlling the outdoor fan to increase the anti-headwind rotation speed at a set acceleration until an exit condition is met;

[0070] Wherein, the anti-headwind rotation speed and the reverse rotation speed have opposite rotation directions.

[0071] Here, the first speed threshold can be understood as a speed threshold for actively protecting the outdoor fan against headwinds. The first speed threshold can be reasonably set based on protection requirements, for example, it can be 1500 rpm.

[0072] It can be understood that if it is determined that the reverse speed of the outdoor fan is greater than the first speed threshold, it is determined that the external wind force poses a risk of damaging the outdoor fan. At this time, the control device of the air conditioner does not need to wait for the power-on command, but directly drives the outdoor fan to set the acceleration to increase the anti-headwind speed, that is, controls the start of the outdoor fan motor and uses the forward speed of the motor (that is, the anti-headwind speed) to counteract the force of the external wind, thereby effectively reducing the reverse speed of the outdoor fan and effectively reducing the risk of damage to the outdoor fan under the action of external wind force.

[0073] Exemplarily, controlling the outdoor fan to increase the anti-headwind speed at a set acceleration until an exit condition is met includes:

[0074] Controlling the outdoor fan to increase the anti-headwind speed at a set acceleration, and counting the acceleration time of increasing the anti-headwind speed and / or the cumulative speed value of the anti-headwind speed;

[0075] Comparing the reverse rotation speed of the outdoor fan during the process of increasing the anti-headwind rotation speed with a second rotation speed threshold, the second rotation speed threshold being less than the first rotation speed threshold;

[0076] If the reverse speed is less than or equal to the second speed threshold, stop driving the outdoor fan and return to the comparison of the reverse speed and the first speed threshold; or, determine that the reverse speed is greater than the second speed threshold and the acceleration time is greater than or equal to the set time threshold and / or the accumulated speed value is greater than or equal to the first speed threshold, then stop driving the outdoor fan and disconnect the power supply circuit of the motor winding of the outdoor fan.

[0077] Here, the second speed threshold can be understood as the first speed threshold minus a reasonable safety threshold. For example, if the first speed threshold is 1500rpm and the safety threshold is set to 600rpm, the second speed threshold is 900rpm. If the outdoor fan is started and accelerated, and the current reverse speed is controlled below the second speed threshold, the outdoor fan can be stopped and the process of comparing the reverse speed with the first speed threshold can be returned to, thereby realizing active anti-adverse wind protection for the outdoor fan.

[0078] It should be noted that the acceleration time and / or cumulative speed value of the outdoor fan in the active anti-headwind protection stage need to be reasonably set to avoid overcurrent and damage to the motor when the external wind is too strong. Based on this, when the reverse speed is greater than the second speed threshold and the acceleration time is greater than or equal to the set time threshold and the cumulative speed value is greater than or equal to at least one of the first speed threshold, the control device of the air conditioner stops driving the outdoor fan and disconnects the power supply circuit of the motor winding of the outdoor fan. In this way, the active anti-headwind protection stage is exited to avoid the safety hazards caused by the operation of the motor when the external wind is too strong, and the power supply circuit of the motor winding is actively disconnected to avoid the induced current generated by the motor winding when the motor reverses under the action of external wind, which may exceed the demagnetization current of the motor, thereby causing damage to the motor or bringing other reliability problems and safety hazards.

[0079] Exemplarily, the protection method further includes:

[0080] The set time threshold is determined based on the first rotation speed threshold and the set acceleration.

[0081] Here, the set time threshold may be set as a ratio of the first rotation speed threshold to the set acceleration, that is, the set time threshold may be set as a time corresponding to acceleration from zero to the first rotation speed threshold at the set acceleration.

[0082] Exemplarily, during the process of increasing the anti-headwind rotation speed, the protection method further includes:

[0083] If it is determined that the reverse rotation speed is greater than a third rotation speed threshold, stopping driving the outdoor fan and disconnecting a power supply circuit of the motor winding of the outdoor fan;

[0084] The third speed threshold is greater than the first speed threshold.

[0085] Here, the third speed threshold can be understood as the speed limit value allowed by the outdoor fan under the action of external wind. If the reverse speed of the outdoor fan is greater than the third speed threshold, the current generated on the motor winding of the outdoor fan is likely to exceed the demagnetization current of the motor, thereby causing the motor to demagnetize. Here, demagnetization refers to the process in which a magnet loses its magnetism and returns to magnetic neutrality. If the motor is demagnetized, it will have an irreversible impact on the performance of the normal operation of the motor. Based on this, the third speed threshold can be reasonably determined based on the test data so that it is less than the reverse speed of the outdoor fan corresponding to the motor demagnetization. In this way, when the speed at which the outdoor fan rotates against the wind driven by the external wind is too high, the power supply circuit of the motor winding of the outdoor fan can be disconnected in time, effectively avoiding the problem that the current generated by the motor power generation of the outdoor fan exceeds the motor demagnetization current and causes damage to the motor, thereby further improving the reliability of the air conditioner.

[0086] Exemplarily, the protecting and controlling the outdoor fan based on the reverse rotation speed of the outdoor fan further includes:

[0087] If it is determined that the reverse rotation speed is less than or equal to the first rotation speed threshold and greater than a fourth rotation speed threshold, controlling the air conditioner to switch to the first mode;

[0088] Among them, the fourth speed threshold is smaller than the first speed threshold, and in the first mode, the air conditioner does not support anti-headwind startup based on a power-on instruction.

[0089] Here, the fourth speed threshold can be understood as a critical threshold for determining whether the outdoor fan is allowed to start against headwind. The anti-headwind start can refer to the technology of controlling the start of the outdoor fan after suppressing the reverse speed based on brake control in the related art, which will not be repeated here.

[0090] It can be understood that if the reverse speed of the outdoor fan is greater than the fourth speed threshold and less than or equal to the first speed threshold, there is no need to actively protect the outdoor fan against headwind. At the same time, there is a high probability of failure to start the outdoor fan against headwind. Therefore, the control device switches to the first mode, so that the air conditioner does not support anti-headwind startup based on the power-on command.

[0091] Exemplarily, the protecting and controlling the outdoor fan based on the reverse rotation speed of the outdoor fan further includes:

[0092] If it is determined that the reverse rotation speed is less than or equal to the fourth rotation speed threshold, controlling the air conditioner to switch to the second mode;

[0093] Among them, in the second mode, the air conditioner supports anti-headwind startup based on a power-on instruction.

[0094] It can be understood that if the reverse speed of the outdoor fan is less than or equal to the fourth speed threshold, there is no need to actively protect the outdoor fan against headwind, and the outdoor fan can be started normally against headwind. Therefore, the control device switches to the second mode so that the air conditioner supports anti-headwind startup based on the power-on command.

[0095] The method for protecting the air conditioner against headwind in the embodiment of the present application is illustrated below with reference to an application example.

[0096] Figure 2 The control circuit diagram of the outdoor unit of the air conditioner in this application example is shown in FIG. Figure 2 As shown, the outdoor unit includes a compressor and an outdoor fan (i.e. Figure 2In the fan shown in the figure, a switch SW1 is added to the positive end (i.e., DC+) and a switch SW2 is added to the negative end (i.e., DC-) of the DC bus power supply of the three-phase inverter bridge drive circuit of the outdoor fan, or a switch SW1 is added to the positive end alone, or a switch SW2 is added to the negative end alone. When the fan is in normal standby or normal operation, both switch SW1 and switch SW2 are in a normally closed state. When the fan is in a state of stopping driving but operating against the wind, based on the protection method of the embodiment of the present application, when the triggering protection condition is met, the drive switch SW1 and / or switch SW2 can be switched from a normally closed state to an open state, thereby cutting off the current loop of the motor winding of the outdoor fan, thereby preventing damage to the fan.

[0097] Exemplarily, switch SW1 and switch SW2 may be relays, or power switching devices such as thyristors, IGBTs (Insulate-Gate Bipolar Transistors), and MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors), which are not limited in the embodiments of the present application.

[0098] like Figure 3 As shown, the protection method of the air conditioner against headwind in this application example may include:

[0099] Step 301, determine whether the outdoor fan is in standby mode, if not, execute step 302, if yes, execute step 304.

[0100] Step 302, determine whether the outdoor fan is in a fault protection shutdown state, if not, execute step 303, if so, execute step 304.

[0101] Here, since step 301 has ruled out the outdoor fan being in standby mode, it is possible to determine whether the outdoor fan is in a fault protection shutdown state when the outdoor fan is driven normally. If not, it is determined that the outdoor fan is operating normally and step 303 is executed; if so, step 304 is executed.

[0102] Step 303: The outdoor fan operates normally.

[0103] Step 304, determine whether the outdoor fan is rotating, if not, execute step 305; if yes, execute step 306.

[0104] Step 305: After receiving the power-on command, the fan can be started normally.

[0105] It is understandable that if the outdoor fan is in standby mode or fault protection shutdown mode, it will not be started. At this time, if the outdoor fan is not rotating, it indicates that the external wind force is small and the outdoor fan can be started normally, that is, it can start and run normally after receiving the power-on command.

[0106] Step 306, determine whether the outdoor fan headwind speed is ≤A, if so, execute step 307, if not, execute step 308.

[0107] Here, A, namely the aforementioned fourth speed threshold, serves as a critical threshold for determining whether the outdoor fan is allowed to be started against headwind. Exemplarily, A is 500 rpm.

[0108] Step 307, after receiving the start-up instruction, the wind turbine can be started against headwind.

[0109] It can be understood that after receiving the power-on command at this headwind speed (i.e. the aforementioned reverse speed), the outdoor fan can be started against the headwind, that is, the air conditioner switches to the aforementioned second mode.

[0110] Step 308, determine whether the outdoor fan headwind speed is ≤ B, if so, execute step 309, if not, execute step 310.

[0111] Here, B is the aforementioned first speed threshold, which is used as a speed threshold for determining whether the outdoor fan performs active anti-adverse wind protection. Exemplarily, B is 1500 rpm.

[0112] Step 309: After receiving the startup command, the fan cannot be started against headwind.

[0113] It is understandable that, at this headwind speed, even if a power-on command is received, the outdoor fan cannot be started against the headwind, that is, the air conditioner switches to the aforementioned first mode.

[0114] Step 310, without waiting for the power-on command, the fan is driven to operate against headwind, the anti-headwind speed is increased from 0 rpm in steps with a set acceleration, and the acceleration time is counted.

[0115] Step 311, determine whether the outdoor fan headwind speed is ≤ BC, if so, execute step 312, if not, execute step 313.

[0116] Here, BC is the aforementioned second speed threshold, and C is the aforementioned safety threshold. Exemplarily, C is 600 rpm.

[0117] Step 312, stop driving the fan to operate against headwind, and return to step 308.

[0118] It is understandable that if the outdoor fan is running against headwind and the current headwind speed is ≤ BC, the outdoor fan can be stopped and the process returns to the aforementioned step 308 .

[0119] Step 313, determine whether the acceleration duration reaches the set duration threshold, if so, execute step 314, if not, execute step 315.

[0120] Here, the set time threshold can be set as the ratio of the first speed threshold to the set acceleration, that is, the set time threshold can be set as the time corresponding to acceleration from zero to the first speed threshold at the set acceleration. For example, the set acceleration can be 5 rpm / s, and the set time threshold can be 300 seconds.

[0121] Step 314, stop driving the fan to operate against headwind and drive SW1 and / or SW2 to disconnect.

[0122] It is understandable that in order to effectively protect the outdoor fan, the fan may be stopped from being driven to operate against adverse winds and the switch SW1 and / or the switch SW2 may be driven to disconnect the current loop of the motor winding.

[0123] Step 315 , determining whether the outdoor fan's headwind speed is greater than D, if so, executing step 314 , if not, returning to step 311 .

[0124] Here, D is the aforementioned third speed threshold, which is the speed limit value allowed for the outdoor fan under the action of external wind force. For example, D is 2000 rpm.

[0125] It can be understood that during the anti-headwind operation of the outdoor fan, if it is detected that the headwind speed of the outdoor fan is greater than D, the fan anti-headwind operation is stopped immediately and SW1 and / or SW2 are driven to be disconnected, which can effectively prevent the current generated by the motor power generation of the outdoor fan from exceeding the motor demagnetization current and causing motor damage. Otherwise, return to step 311 and continue to increase the anti-headwind speed with the set acceleration until the headwind speed of the outdoor fan is effectively controlled or the acceleration time reaches the set time threshold, and the active anti-headwind protection stage is exited.

[0126] It can be understood that the protection method of this application example, through the above control method logic and control circuit, can effectively resist the effect of external wind when the outdoor fan of the air conditioner is in standby state or fault protection shutdown state, thereby realizing the protection of the outdoor fan and related circuits and extending the service life of the air conditioner, as follows:

[0127] When the outdoor fan speed against wind is ≤A, after receiving the start-up command, the outdoor fan can be driven to start against wind;

[0128] When the outdoor fan speed against wind is greater than A and less than or equal to B, the fan cannot be driven to start against wind after receiving the start command;

[0129] When the headwind speed of the outdoor fan is greater than B and less than or equal to D, the motor driving the outdoor fan rotates at a certain opposite speed to counteract the headwind speed, reducing the headwind speed of the fan to less than or equal to BC, and stopping driving the outdoor fan; or when the acceleration time of the anti-headwind operation reaches the set time threshold, stopping driving the outdoor fan to operate in an anti-headwind manner, and driving the switch SW1 and / or the switch SW2 to disconnect the current loop of the motor winding of the outdoor fan;

[0130] When the headwind speed of the outdoor fan is greater than D, the outdoor fan is stopped from operating against the headwind, and the switch SW1 and / or the switch SW2 are driven to disconnect the current loop of the motor winding of the outdoor fan to prevent the current generated on the motor coil from exceeding the demagnetization current of the motor, thereby avoiding damage to the motor of the outdoor fan.

[0131] In order to implement the method of the embodiment of the present application, the embodiment of the present application also provides an air conditioner anti-headwind protection device, which corresponds to the above-mentioned air conditioner anti-headwind protection method, and each step in the embodiment of the above-mentioned air conditioner anti-headwind protection method is also fully applicable to the embodiment of the air conditioner anti-headwind protection device of the present application.

[0132] like Figure 4 As shown, the air conditioner anti-adverse wind protection device includes: a first acquisition module 401, a second acquisition module 402 and a protection control module 403. The first acquisition module 401 is used to acquire the current operating state of the air conditioner; the second acquisition module 402 is used to acquire the reverse rotation speed of the outdoor fan of the air conditioner if it is determined that the air conditioner is in the target state; the protection control module 403 is used to protect and control the outdoor fan based on the reverse rotation speed of the outdoor fan.

[0133] In some embodiments, the protection control module 403 is specifically used to:

[0134] Controlling the outdoor fan to increase the anti-headwind speed at a set acceleration, and counting the acceleration time of increasing the anti-headwind speed and / or the cumulative speed value of the anti-headwind speed;

[0135] Comparing the reverse rotation speed of the outdoor fan during the process of increasing the anti-headwind rotation speed with a second rotation speed threshold, the second rotation speed threshold being less than the first rotation speed threshold;

[0136] If the reverse speed is less than or equal to the second speed threshold, stop driving the outdoor fan and return to the comparison of the reverse speed and the first speed threshold; or, determine that the reverse speed is greater than the second speed threshold and the acceleration time is greater than or equal to the set time threshold and / or the accumulated speed value is greater than or equal to the first speed threshold, then stop driving the outdoor fan and disconnect the power supply circuit of the motor winding of the outdoor fan.

[0137] In some embodiments, the protection control module 403 is further configured to:

[0138] The set time threshold is determined based on the first rotation speed threshold and the set acceleration.

[0139] In some embodiments, during the process of increasing the anti-adverse wind speed, the protection control module 403 is further used to:

[0140] If it is determined that the reverse rotation speed is greater than a third rotation speed threshold, stopping driving the outdoor fan and disconnecting a power supply circuit of the motor winding of the outdoor fan;

[0141] The third speed threshold is greater than the first speed threshold.

[0142] In some embodiments, the protection control module 403 is further configured to:

[0143] If it is determined that the reverse rotation speed is less than or equal to the first rotation speed threshold and greater than a fourth rotation speed threshold, controlling the air conditioner to switch to the first mode;

[0144] Among them, the fourth speed threshold is smaller than the first speed threshold, and in the first mode, the air conditioner does not support anti-headwind startup based on a power-on instruction.

[0145] In some embodiments, the protection control module 403 is further configured to:

[0146] If it is determined that the reverse rotation speed is less than or equal to the fourth rotation speed threshold, controlling the air conditioner to switch to the second mode;

[0147] Among them, in the second mode, the air conditioner supports anti-headwind startup based on a power-on instruction.

[0148] In actual application, the first acquisition module 401, the second acquisition module 402 and the protection control module 403 can be implemented by the processor of the air conditioner. Of course, the processor needs to run the computer program in the memory to realize its function.

[0149] It should be noted that: the air conditioner anti-adverse wind protection device provided in the above embodiment only uses the division of the above program modules as an example when controlling the air conditioner. In actual applications, the above processing can be assigned to different program modules as needed, that is, the internal structure of the device can be divided into different program modules to complete all or part of the processing described above. In addition, the air conditioner anti-adverse wind protection device provided in the above embodiment and the air conditioner anti-adverse wind protection method embodiment belong to the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0150] Based on the hardware implementation of the above program modules and in order to implement the method of the embodiment of the present application, the embodiment of the present application also provides an air conditioner. Figure 5 Only an exemplary structure of the air conditioner is shown, not all structures, and it can be implemented as needed. Figure 5 Partial or complete structure shown.

[0151] like Figure 5 As shown, the air conditioner 500 provided in the embodiment of the present application includes: at least one processor 501, a memory 502 and a user interface 503. The various components in the air conditioner 500 are coupled together through a bus system 504. It can be understood that the bus system 504 is used to realize the connection and communication between these components. In addition to the data bus, the bus system 504 also includes a power bus, a control bus and a status signal bus. However, for the sake of clarity, in Figure 5 Various buses are labeled as bus system 504 .

[0152] The user interface 503 may include a display, a keyboard, a mouse, a trackball, a click wheel, keys, buttons, a touch pad or a touch screen.

[0153] The memory 502 in the embodiment of the present application is used to store various types of data to support the operation of the air conditioner. Examples of such data include: any computer program used to operate on the air conditioner.

[0154] Exemplarily, the air conditioner includes an outdoor fan and a power supply circuit for supplying power to the motor winding of the outdoor fan, wherein a switch device for switching the on-off state is provided on the power supply circuit, for example Figure 2 Switch SW1 and / or switch SW2 are shown.

[0155] The air conditioner anti-adverse wind protection method disclosed in the embodiment of the present application can be applied to the processor 501, or implemented by the processor 501. The processor 501 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the air conditioner anti-adverse wind protection method can be completed by the hardware integrated logic circuit or software instructions in the processor 501. The above-mentioned processor 501 can be a general-purpose processor, a digital signal processor (DSP, DigitalSignal Processor), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The processor 501 can implement or execute the various methods, steps and logic block diagrams disclosed in the embodiment of the present application. The general-purpose processor can be a microprocessor or any conventional processor, etc. In combination with the steps of the method disclosed in the embodiment of the present application, it can be directly embodied as a hardware decoding processor to execute, or it can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium, which is located in the memory 502. The processor 501 reads the information in the memory 502 and completes the steps of the air conditioner anti-adverse wind protection method provided in the embodiment of the present application in combination with its hardware.

[0156] In an exemplary embodiment, the control device of the air conditioner can be implemented by one or more application specific integrated circuits (ASIC), DSP, programmable logic device (PLD), complex programmable logic device (CPLD), field programmable gate array (FPGA), general processor, controller, microcontroller (MCU), microprocessor, or other electronic components to execute the aforementioned method.

[0157] It can be understood that the memory 502 can be a volatile memory or a non-volatile memory, and can also include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic random access memory (FRAM), a flash memory, a magnetic surface memory, an optical disk, or a compact disc read-only memory (CD-ROM); the magnetic surface memory can be a disk memory or a tape memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), synchronous static random access memory (SSRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus random access memory (DRRAM).The memories described in the embodiments of the present application are intended to include, but are not limited to, these and any other suitable types of memories.

[0158] In an exemplary embodiment, the present application also provides a storage medium, namely a computer storage medium, which may be a computer-readable storage medium, for example, a memory 502 storing a computer program, and the computer program may be executed by a processor 501 of the air conditioner to complete the steps described in the method of the present application. The computer-readable storage medium may be a memory such as a ROM, a PROM, an EPROM, an EEPROM, a Flash Memory, a magnetic surface memory, an optical disk, or a CD-ROM.

[0159] It should be noted that: "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0160] In addition, the technical solutions described in the embodiments of the present application can be combined arbitrarily without conflict.

[0161] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for protecting an air conditioner from adverse wind, characterized in that: include: Get the current operating status of the air conditioner; If it is determined that the air conditioner is in the target state, obtaining the reverse rotation speed of the outdoor fan of the air conditioner; Based on the reverse rotation speed of the outdoor fan, protection control is performed on the outdoor fan.

2. The method according to claim 1, characterized in that: The protecting and controlling the outdoor fan based on the reverse rotation speed of the outdoor fan comprises: comparing the reverse rotation speed with a first rotation speed threshold; If it is determined that the reverse rotation speed is greater than the first rotation speed threshold, controlling the outdoor fan to increase the anti-headwind rotation speed at a set acceleration until an exit condition is met; Wherein, the anti-headwind rotation speed and the reverse rotation speed have opposite rotation directions.

3. The method according to claim 2, characterized in that The controlling the outdoor fan to increase the anti-headwind speed at a set acceleration until an exit condition is met includes: Controlling the outdoor fan to increase the anti-headwind speed at a set acceleration, and counting the acceleration time of increasing the anti-headwind speed and / or the cumulative speed value of the anti-headwind speed; Comparing the reverse rotation speed of the outdoor fan during the process of increasing the anti-headwind rotation speed with a second rotation speed threshold, the second rotation speed threshold being less than the first rotation speed threshold; If the reverse speed is less than or equal to the second speed threshold, stop driving the outdoor fan and return to the comparison of the reverse speed and the first speed threshold; or, determine that the reverse speed is greater than the second speed threshold and the acceleration time is greater than or equal to the set time threshold and / or the accumulated speed value is greater than or equal to the first speed threshold, then stop driving the outdoor fan and disconnect the power supply circuit of the motor winding of the outdoor fan.

4. The method according to claim 3, characterized in that The method further comprises: The set time threshold is determined based on the first rotation speed threshold and the set acceleration.

5. The method according to claim 3, characterized in that: In the process of increasing the anti-headwind rotation speed, the method further includes: If it is determined that the reverse rotation speed is greater than a third rotation speed threshold, stopping driving the outdoor fan and disconnecting a power supply circuit of the motor winding of the outdoor fan; The third speed threshold is greater than the first speed threshold.

6. The method according to claim 2, characterized in that The protecting and controlling the outdoor fan based on the reverse rotation speed of the outdoor fan further includes: If it is determined that the reverse rotation speed is less than or equal to the first rotation speed threshold and greater than a fourth rotation speed threshold, controlling the air conditioner to switch to the first mode; Among them, the fourth speed threshold is smaller than the first speed threshold, and in the first mode, the air conditioner does not support anti-headwind startup based on a power-on instruction.

7. The method according to claim 6, characterized in that The protecting and controlling the outdoor fan based on the reverse rotation speed of the outdoor fan further includes: If it is determined that the reverse rotation speed is less than or equal to the fourth rotation speed threshold, controlling the air conditioner to switch to the second mode; Among them, in the second mode, the air conditioner supports anti-headwind startup based on a power-on instruction.

8. An air conditioner anti-adverse wind protection device, characterized in that: include: A first acquisition module, used to acquire the current operating state of the air conditioner; A second acquisition module, for acquiring a reverse rotation speed of an outdoor fan of the air conditioner if it is determined that the air conditioner is in a target state; A protection control module is used to perform protection control on the outdoor fan based on the reverse rotation speed of the outdoor fan.

9. An air conditioner, characterized in that: include: A processor and a memory for storing a computer program that can be executed on the processor, wherein: The processor is used to execute the steps of the method according to any one of claims 1 to 7 when running a computer program.

10. The air conditioner according to claim 9, characterized in that: The air conditioner comprises an outdoor fan and a power supply circuit for supplying power to the motor winding of the outdoor fan, and a switch device for switching on and off states is arranged on the power supply circuit.

11. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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