Air conditioner fault detection device and air conditioner fault detection method

Abstract

The invention provides an air conditioner fault detection device and an air conditioner fault detection method. The air conditioner fault detection device comprises a control device; the switching circuit is coupled with the control device, the switching circuit is further coupled with the power source and a fan of the parking air conditioner, and the control device controls the switching circuit to be switched on or switched off so as to control connection between the power source and the fan and detects whether the fan breaks down or not; the switching circuit comprises a triode and a field effect transistor, the base of the triode is coupled with the control device, and the emitter of the triode is grounded; the grid electrode of the field-effect tube is connected with the collector electrode of the triode, the fan is connected with the drain electrode of the field-effect tube, and the power supply is connected with the source electrode of the field-effect tube. By means of the mode, the control device controls the switching circuit to enable the draught fan and the power source to be connected or disconnected, so that whether the draught fan is subjected to self-protection locking or not and other problems which can be solved through power failure or not can be judged, the problem of misjudgment of draught fan faults is prevented, and the risk of draught fan replacement is effectively reduced.

Description

Technical Field

[0001] The present application is applied to the technical field of variable frequency household appliances, and in particular relates to an air conditioner fault detection device and an air conditioner fault detection method. Background Art

[0002] The parking air conditioner is powered directly by the battery to the indoor and outdoor electric control. The outdoor electric control receives power and then receives the indoor start command to start the compressor and outdoor fan and other loads. At present, the existing outdoor brushless fans are always powered by the positive and negative poles. The speed control signal of the outdoor electric control gives different voltages, and the motor rotates at different speeds. The outdoor MCU (microcomputer) judges whether the outdoor fan is working normally through the feedback signal.

[0003] However, due to the complex and diverse working environment of parking air conditioners, sometimes the battery voltage fluctuates or the outdoor fan of some existing parking air conditioners may be locked by protection. If the outdoor motor is not powered off, the protection cannot be cleared. At this time, after-sales personnel need to connect the outdoor fan to the parking outdoor electric control, and then connect the outdoor fan to resume normal operation. That is, the electric control or motor may be misjudged to be damaged, and it may be directly replaced, which increases the after-sales cost. Summary of the invention

[0004] The present application provides an air conditioning fault detection device to solve the problem of false alarm faults of a parking air conditioner fan.

[0005] In order to solve the above-mentioned technical problems, the present application provides, on the one hand, an air-conditioning fault detection device, comprising: a control device; a switching circuit, the switching circuit being coupled to the control device, the switching circuit also being coupled to a power supply and a fan of a parking air conditioner, the control device controlling the switching circuit to be turned on or off to control the connection between the power supply and the fan, and detecting whether the fan is faulty.

[0006] The switch circuit includes a transistor and a field effect transistor, the base of the transistor is coupled to the control device, the emitter of the transistor is grounded; the gate of the field effect transistor is connected to the collector of the transistor, the fan is connected to the drain of the field effect transistor, and the power supply is connected to the source of the field effect transistor.

[0007] The switch circuit further includes: a first protection circuit, one end of which is coupled to the base of the transistor and the other end is grounded; a second protection circuit, one end of which is connected to the collector of the transistor and the other end is connected to the power supply.

[0008] The second protection circuit includes a diode, an anode of the diode is coupled to the collector of the transistor, and a cathode of the diode is coupled to the power supply.

[0009] Among them, the switching circuit also includes a third protection circuit, which includes a first capacitor and a second capacitor, the common end of the first capacitor and the second capacitor is coupled to the collector of the transistor, the other end of the first capacitor is coupled to the source of the field effect transistor, and the other end of the second capacitor is coupled to the drain of the field effect transistor.

[0010] To solve the above problems, the present application also provides an air conditioning fault detection method, including: a control device controls the fan to start, and determines whether the fan speed is lower than a preset speed; if the fan speed is not lower than the preset speed, the fan is normal; if the fan speed is lower than the preset speed, the control device controls the fan to stop, and determines whether the fan start-up times reach the preset times; if the fan start-up times do not reach the preset times, the control device controls the fan to start, and determines whether the fan speed is lower than the preset speed; if the fan start-up times reach the preset times, the fan abnormality information is output.

[0011] Among them, the steps of the control device controlling the start-up of the fan and judging whether the speed of the fan is lower than the preset speed include: controlling the power supply to supply power to the fan through the control device; the control device records the start-up time of the fan and collects the speed of the fan; after the start-up time of the fan reaches the first preset time, judging whether the speed of the fan is lower than the preset speed.

[0012] Among them, if the fan speed is lower than the preset speed, the control device controls the fan to shut down, and the steps of judging whether the fan start-up times reach the preset times include: the control device controls the power supply to stop supplying power to the fan; the control device obtains the number of fan starts, and judges whether the fan start-up times reaches the preset times.

[0013] Among them, if the number of fan start-up times does not reach the preset number, the execution control device controls the fan to start, and the step of judging whether the fan speed is lower than the preset speed includes: the control device obtains the time after the fan is shut down, and after the fan shutdown time reaches a second preset time, the execution control device controls the fan to start, and the step of judging whether the fan speed is lower than the preset speed.

[0014] Among them, if the rotation speed is not lower than the preset rotation speed, the step of the fan being normal includes: controlling the rotation speed of the fan by a control device.

[0015] Wherein, the air conditioning fault detection method is executed by an air conditioning fault detection device.

[0016] The beneficial effect of the present application is: different from the prior art, the present application couples a switching circuit between the power supply and the fan. When parking, the control device controls the switching circuit to connect or disconnect the fan and the power supply, thereby being able to determine whether the fan is locked for self-protection, etc., which requires power off to solve the problem, thereby preventing the problem of misjudgment of fan failure and effectively reducing the risk of replacing the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural block diagram of an embodiment of an air conditioner fault detection device of the present application;

[0018] Figure 2 is a structural schematic diagram of an embodiment of a switch circuit of the present application;

[0019] Figure 3 It is a flowchart of the first embodiment of the air conditioner fault detection method of the present application;

[0020] Figure 4 This application Figure 3 S11 is a flow chart of an embodiment;

[0021] Figure 5 This application Figure 3 FIG. 1 is a flow chart of an embodiment of S13. DETAILED DESCRIPTION

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

[0023] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0024] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0025] See also Figure 1 , Figure 1 It is a structural block diagram of an embodiment of an air conditioning fault detection device provided in the present application.

[0026] The present application provides an air conditioning fault detection device, such as Figure 1 As shown, an air conditioning fault detection device of the present embodiment includes a control device 10 and a switch circuit 20. The switch circuit 20 is coupled to the control device 10. The switch circuit 20 is also coupled to a power supply 30 and a fan 40 of a parking air conditioner. The control device 10 controls the switch circuit 20 to be turned on or off to control the connection between the power supply 30 and the fan 40, and detects whether the fan 40 is faulty.

[0027] Combination Figure 2 As shown, the switch circuit 20 includes: a transistor 201 and a field effect transistor 202. The base of the transistor 201 is coupled to the control device 10, and the emitter of the transistor 201 is grounded. The gate of the field effect transistor 202 is connected to the collector of the transistor 201, the fan 40 is connected to the drain of the field effect transistor 202, and the power supply 30 is connected to the source of the field effect transistor 202.

[0028] In this embodiment, if Figure 2 As shown, the switch circuit 20 is provided with a first port 101, a second port 102 and a third port 103, wherein the first port 101 is coupled to the base of the transistor 201, and the control device 10 is coupled to the first port 101. The second port 102 is coupled to the source of the field effect transistor 202, and the other end is coupled to the power supply 30, and the third port 103 is coupled to the drain of the field effect transistor 202, and the other end is coupled to the fan 40, that is, the control device 10 outputs the electrical signal to the transistor 201 through the first port 101, and the power supply 30 outputs the electrical signal to the field effect transistor 202 through the second port 102, and outputs it to the fan 40 through the third port 103.

[0029] In an optional embodiment, the output end of the control device 10 is connected to the switch circuit 20, and the switch circuit 20 is coupled to the power supply 30 and the fan 40 of the parking air conditioner. When the vehicle is parked, the control device 10 stops outputting signals, so that the switch circuit 20 is disconnected, thereby disconnecting the power supply 30 from the fan 40 of the parking air conditioner. Since the power supply 30 and the fan 40 are disconnected, the fan 40 is effectively prevented from being continuously connected to the power supply 30, resulting in continuous power consumption. Specifically, the output end of the control device 10 is connected to the base of the transistor 201 in the switch circuit 20. When the output device outputs an electrical signal to turn on the transistor 201, after the transistor 201 is turned on, the field effect tube 202 is turned on, and the electrical signal of the power supply 30 can be output to the fan 40 of the parking air conditioner through the field effect tube 202.

[0030] In this embodiment, the collector of the transistor 201 is connected to the gate of the field effect transistor 202, the source of the field effect transistor 202 is connected to the power supply 30, and the fan 40 is connected to the drain of the field effect transistor 202. The electrical signal output by the control device 10 is output to the base of the transistor 201, so that the transistor 201 is turned on. Since the transistor 201 is turned on, the gate of the field effect transistor 202 is connected to the collector of the transistor 201, and the emitter of the transistor 201 is connected to the ground. The gate of the field effect transistor 202 can be connected to the ground through the transistor 201, that is, when the transistor 201 is turned on, the field effect transistor 202 is turned on. On this basis, the source of the field effect transistor 202 receives the electrical signal of the power supply 30, thereby outputting the electrical signal to the fan 40 through the drain of the field effect transistor 202. In this embodiment, the fan 40 is also connected to a driving component, that is, after the field effect transistor 202 connects the power supply 30 to the fan 40, the driving component sends a driving signal to control the fan 40 to start.

[0031] In a specific application scenario, the air conditioning fault detection device is arranged on a car, so that when the car is parked, the control device 10 outputs a low-level signal or no signal output, the transistor 201 cannot be turned on, so that the field effect tube 202 is cut off, and there is no electrical signal output at the drain output end of the field effect tube 202. At this time, the fan 40 does not work. When the fan 40 is required to work, the control device 10 outputs a high-level signal, the transistor 201 is turned on, so that the field effect is turned on, the power supply 30 is turned on with the fan 40, and the drive component starts to control the fan 40 to work. In the present embodiment, when the fan 40 is working, the working state of the fan 40 can be fed back to the control device 10, and the control device 10 can determine whether the fan 40 is in a normal state according to the rotational speed of the fan 40. If the fan 40 is in an abnormal state, the control device 10 can stop outputting the electrical signal to disconnect the switch circuit 20, so that the fan 40 stops working. Then, after a predetermined time, the control device 10 outputs the electrical signal again so that the fan 40 is powered on, thereby determining whether the fan 40 is locked for self-protection, etc., which can be solved by powering off, to prevent the occurrence of problems such as misjudgment of a fan 40 fault.

[0032] In the above manner, by coupling the switch circuit 20 between the power supply 30 and the fan 40, when parking, the control device 10 controls the conduction of the transistor 201 and the field effect transistor 202 by outputting different electrical signals, so that the fan 40 and the power supply 30 are turned on or off, thereby being able to determine whether the fan 40 is locked for self-protection and other problems that require power off to be solved, thereby preventing the problem of misjudging the fan 40 fault from occurring, thereby effectively reducing the risk of replacing the fan 40.

[0033] In an optional embodiment, the switch circuit 20 further includes: a first protection circuit 203, one end of the first protection circuit 203 is coupled to the base of the transistor 201, and the other end is grounded; a second protection circuit 204, one end of the second protection circuit 204 is connected to the collector of the transistor 201, and the other end is connected to the power supply 30. The first protection circuit 203 can be a capacitor-resistor circuit, which can reduce the voltage and filter the electrical signal output by the control device 10, or can be set to other voltage reduction and filtering circuits, which are not specifically limited in this application. That is, one end of the first protection circuit 203 is connected to the output end of the control device 10, and the other end is connected to the emitter of the transistor 201, so as to reduce the voltage and filter the electrical signal output by the control device 10, thereby protecting the transistor 201, and one end of the second protection circuit 204 is connected to the collector of the transistor 201, and the other end is connected to the power supply 30. After the control device 10 cuts off the output of the electrical signal, the transistor 201 can be discharged through the second protection circuit 204, thereby protecting the transistor 201. Specifically, Figure 2 As shown, the second protection circuit 204 may include a diode 208, the anode of the diode 208 is coupled to the collector of the transistor 201, and the cathode of the diode 208 is connected to the power supply 30, so that the transistor 201 is discharged through the diode 208 after being turned off. Further, the switch circuit 20 also includes a third protection circuit 205, and the third protection circuit 205 includes a first capacitor 206 and a second capacitor 207, the common end of the first capacitor 206 and the second capacitor 207 is coupled to the collector of the transistor 201, the other end of the first capacitor 206 is coupled to the source of the field effect transistor 202, and the other end of the second capacitor 207 is coupled to the drain of the field effect transistor 202. That is, the third protection circuit 205 can protect the field effect transistor 202 and ensure the working voltage of the field effect transistor 202.

[0034] See also Figure 3 , Figure 3 1 is a flow chart of the first embodiment of the air conditioner fault detection method of the present application. It should be noted that if there are substantially the same results, the method of the present invention is not limited to Figure 3 The process sequence shown is limited. Figure 3 As shown, the method comprises the following steps:

[0035] S11: The control device 10 controls the fan 40 to start, and determines whether the rotation speed of the fan 40 is lower than a preset rotation speed.

[0036] In this embodiment, the control device 10 outputs a high-level signal, thereby controlling the switch circuit 20 to be turned on, and the power supply 30 establishes a connection with the fan 40 so that the fan 40 is powered. Specifically, the collector of the transistor 201 receives the high-level signal output by the control device 10, thereby turning on the transistor 201. After the transistor 201 is turned on, the field effect tube 202 is controlled to be turned on, so that the electrical signal of the power supply 30 can be output to the fan 40 through the field effect tube 202, and the fan 40 is controlled to start. After the fan 40 is started, the control device 10 receives the speed information of the fan 40, thereby judging that the speed of the fan 40 is lower than the preset speed.

[0037] Among them, the preset speed can be set to 200 rpm, or any value from 100 rpm to 300 rpm, and this application does not make any specific limitation here.

[0038] S12: If the rotation speed of the fan 40 is not lower than the preset rotation speed, the fan 40 is normal.

[0039] After the control device 10 receives the feedback signal of the speed of the fan 40, if the speed of the fan 40 is not lower than the preset speed, the fan 40 is normal, and the control device 10 outputs the information that the fan 40 is normal. For example, when the preset speed is 200rpm, when the speed of the fan 40 is not lower than 200rpm, the fan 40 is judged to be normal. At this time, if the fan 40 is normal, the control device 10 outputs a signal that the fan 40 is normal, which can be sent to the drive component so that the drive component drives the fan 40 to operate. When the fan 40 is judged to be not normal, the control device 10 can adjust the speed of the fan 40. Specifically, the speed of the fan 40 can be controlled according to the temperature required in the parking space, and it is set according to the actual needs of the user. Further, the drive component can be arranged in the control device 10, and after the control device 10 detects that the fan 40 is normal, it can be used to drive the fan 40 to operate, or it can be set separately, and the speed of the fan 40 is adjusted by the drive device. This application does not make specific limitations here.

[0040] S13: If the rotation speed of the fan 40 is lower than the preset rotation speed, the control device 10 controls the fan 40 to shut down, and determines whether the number of starts of the fan 40 reaches the preset number.

[0041] In this embodiment, after the speed of the fan 40 is lower than the preset speed, the control device 10 is cut off or outputs a low-level signal, thereby disconnecting the switch circuit 20, disconnecting the power supply 30 and the fan 40, and shutting down the fan 40. After the fan 40 is shut down, the control component determines whether the number of starts of the fan 40 reaches a predetermined number of times, wherein the predetermined number of times is not less than three times. When the speed of the fan 40 of the parking air conditioner does not reach the preset speed, the compressor needs to continue to operate, and the continuous operation of the compressor will cause the air-conditioning system pressure to be too high, thereby causing overvoltage or overcurrent protection in other devices except the fan 40, that is, the predetermined number of times is not greater than five times. For example, the preset number of times is set to four times, and this application does not make a specific limitation here.

[0042] If the number of times the fan 40 is started does not reach the preset number, the control device 10 obtains the time after the fan 40 is shut down. After the shutdown time of the fan 40 reaches the second preset time, S11 is executed.

[0043] In this embodiment, the control device 10 obtains the feedback signal of the fan 40 and records the time when the fan 40 is shut down. Specifically, the fan 40 is in an abnormal state, and the control device 10 shuts down the fan 40 1us after the first preset time. After shutting down the fan 40, it starts to record the shutdown time of the fan 40.

[0044] The control device 10 records the shutdown time of the fan 40 and compares the shutdown time of the fan 40 with the second preset time. After the shutdown time of the fan 40 reaches the second preset time, the control device 10 starts to control the start of the fan 40, that is, repeatedly starts the start of the fan 40 and judges the speed of the fan 40, wherein the second preset time can be 5 seconds to 10 seconds, and the second preset time can be set based on the protection lock of the fan 40, for example, 6 seconds, 8 seconds, etc., and this application does not make specific limitations here.

[0045] In this embodiment, when the control device 10 determines that the number of times the fan 40 is started has not reached the preset number of times, the control device 10 controls the fan 40 to start again, and determines whether the speed is lower than the preset speed, and again determines whether the speed of the fan 40 reaches the preset speed. The specific steps are the same as the above steps and will not be elaborated here.

[0046] S14: If the number of times the fan 40 is started reaches a preset number, the abnormal information of the fan 40 is output.

[0047] Specifically, after the control device 10 determines that the number of starts of the fan 40 reaches a preset number, for example, after determining that the number of starts of the fan 40 reaches three times, the control device 10 cuts off or outputs a low-level signal to disconnect the open circuit, thereby shutting down the fan 40, and outputs a signal indicating an abnormality of the fan 40. In this embodiment, an alarm device is provided in the control device 10, and after the control device 10 outputs an abnormality signal of the fan 40, the control device 10 controls the alarm device to sound an alarm to prompt the user that the fan 40 has a fault.

[0048] In a specific application scenario, the control device 10 outputs a high-level signal, and the collector of the transistor 201 receives the high-level signal output by the control device 10. The transistor 201 is turned on to make the field effect tube 202 turned on, so that the electrical signal of the power supply 30 can be output to the fan 40 through the field effect tube 202 to start the fan 40. After the fan 40 is started, it is determined whether the speed of the fan 40 is lower than the preset speed. If the speed of the fan 40 is lower than the preset speed, the control device 10 is cut off to control the switch circuit 20 to disconnect, so that the power supply 30 is disconnected from the fan 40. On this basis, it is determined whether the number of starts of the fan 40 reaches the preset number. If the preset number of times is not reached, the control device 10 controls the fan 40 to start again and completes the judgment of the rotation speed and the number of times the fan 40 is started. After the rotation speed reaches the preset speed, the control device 10 outputs a signal that the fan 40 is normal. If the rotation speed does not reach the preset speed, and the number of times the fan 40 is started reaches the preset number, the control device 10 outputs a signal that the fan 40 is abnormal and controls the alarm device to alarm, that is, by turning on and off the fan 40 multiple times, it is determined whether the fan 40 is locked for protection by itself, thereby effectively preventing the occurrence of misjudgment of a fan 40 failure.

[0049] Please refer to Figure 4 , Figure 4 yes Figure 3 Specifically, the above S11 may further include the following steps:

[0050] S111: Control the power supply 30 to supply power to the fan 40 through the control device 10 .

[0051] In this embodiment, the control device 10 outputs a high-level signal, the base of the transistor 201 receives the high-level signal so that the transistor 201 is turned on, and the field effect transistor 202 is turned on so that the power supply 30 and the fan 40 are turned on, so that the power supply 30 supplies power to the fan 40, the drive component sends a drive signal, and the fan 40 receives the power-on command of the drive component, so that the fan 40 starts.

[0052] S112 : the control device 10 records the start time of the fan 40 , and collects the rotation speed of the fan 40 .

[0053] After the fan 40 is powered on and started, the control device 10 starts to record the start time of the fan 40. Specifically, the drive component outputs a speed control signal to start the fan 40, and at the same time, the control device 10 starts to receive a feedback signal of the speed of the fan 40, and collects the speed of the fan 40 according to the received feedback signal within a first preset time. Among them, the first preset time can be any reasonable value between 50 seconds and 100 seconds, such as 60 seconds, 80 seconds, and this application does not make specific limitations here.

[0054] S113: After the start-up time of the fan 40 reaches the first preset time, it is determined whether the rotation speed of the fan 40 is lower than the preset rotation speed.

[0055] In this embodiment, according to the feedback signal of the speed of the fan 40 received within the first preset time, after reaching the first preset time, it is determined whether the speed of the fan 40 within the first preset time is lower than the preset speed. In other embodiments, the control device 10 may continuously determine the speed of the fan 40 within the first preset time, thereby determining whether the speed of the fan 40 is lower than the preset speed, or after reaching the first preset time, the control device 10 may calculate the average speed of the fan 40 within the first preset time according to the speed signal of the fan 40, thereby comparing the average speed within the first preset time with the preset speed, and determining whether the speed of the fan 40 is lower than the preset speed. This application does not make specific limitations here.

[0056] That is to say, a feedback signal of the fan 40 is received within the first preset time. If the rotation speed of the fan 40 is lower than the preset rotation speed within the first preset time, the fan 40 is abnormal. If the rotation speed of the fan 40 is not lower than the preset rotation speed, the fan 40 is normal.

[0057] Please refer to Figure 5 , Figure 5 yes Figure 3 Specifically, the above S13 may further include the following steps:

[0058] S131 : The control device 10 controls the power supply 30 to stop supplying power to the fan 40 .

[0059] In this embodiment, the control device 10 determines that the rotation speed of the fan 40 is lower than the preset rotation speed based on the feedback signal of the fan 40, and the fan 40 is in an abnormal state. On this basis, the control device 10 controls the switch circuit 20 to disconnect so that the power supply 30 is disconnected from the fan 40, the power supply 30 stops supplying power to the fan 40, and the fan 40 stops running.

[0060] S132: The control device 10 obtains the number of startups of the fan 40, and determines whether the number of startups of the fan 40 reaches a preset number.

[0061] In this embodiment, the control device 10 obtains the number of starts of the fan 40 according to the feedback information of the rotation of the fan 40, wherein the control device 10 can record the number of starts of the fan 40, and after the fan 40 is shut down, the number of starts of the fan 40 is compared with the preset number, so as to determine whether the number of starts of the fan 40 reaches the preset number. Specifically, when the fan 40 is started for the first time, since it is not possible to determine whether the fan 40 is in an abnormal state, the control device 10 may not record the number of starts of the fan 40, thereby reducing the data processing amount of the control device 10. If the speed of the fan 40 is lower than the preset speed within the first preset time, when the control device 10 controls the switch circuit 20 to turn on again to start the fan 40, the control device 10 starts to record the number of starts of the fan 40, and at this time, the control device 10 records the number of starts of the fan 40 as two.

[0062] In other embodiments, the control device 10 may record the number of times the fan 40 is shut down, and after the fan 40 is shut down, compare the number of times the fan 40 is shut down with a preset number of times, so as to determine whether the number of times the fan 40 is shut down reaches the preset number of times. Specifically, after the fan 40 is started for the first time, if the speed of the fan 40 does not reach the preset speed, the fan 40 needs to be shut down. When the fan 40 is shut down for the first time, the control device 10 records the first time the fan 40 is shut down.

[0063] In an optional embodiment, the air conditioning fault detection method is executed by the above-mentioned air conditioning fault detection device. Specifically, when the air conditioner is fault-detected, the control device 10 outputs a high-level signal, thereby starting the fan 40. After the fan 40 is started, the control device 10 receives a feedback signal from the fan 40 within a first preset time, and determines and compares the rotation speed of the fan 40 with the preset rotation speed within the first preset time. If the rotation speed of the fan 40 is lower than the preset rotation speed, the control device 10 can control the switch circuit 20 to disconnect 1us after the first preset time, so that the fan 40 is shut down, and records the number of times the fan 40 is shut down, and compares the number of times the fan 40 is shut down with the preset number. If the number of times the fan 40 is shut down does not reach the preset number, the control device 10 records the time when the fan 40 is shut down after the fan 40 is shut down, and compares it with the second preset time. After reaching the second preset time, the control device 10 executes to output a high-level signal again, thereby controlling the fan 40 to start. If the number of times the fan 40 is shut down is within the preset number, and the rotation speed of the fan 40 is always lower than the preset speed, it is determined that the fan 40 is faulty, and the control device 10 outputs a fan 40 fault signal and controls the alarm device to alarm. If the rotation speed of the fan 40 reaches the preset rotation speed within the preset number of times, it means that the fan 40 has a false alarm fault due to its own locking protection, which means that the fan 40 is normal.

[0064] Through the above method, by shutting down and ventilating the fan 40 multiple times within a preset number of times and comparing the rotation speed of the fan 40 with the preset rotation speed, the probability of false alarm of the fan 40 of the parking air conditioner due to its own locking protection can be effectively reduced, thereby reducing the number of times after-sales personnel deal with fan 40 failures and reducing after-sales costs.

[0065] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An air conditioner fault detection device, It is characterized in that The air conditioning fault detection device comprises: Control devices; a switch circuit, the switch circuit being coupled to the control device, the switch circuit being also coupled to a power source and a fan of a parking air conditioner, the control device controlling the switch circuit to be turned on or off to control the connection between the power source and the fan, and detecting whether the fan is faulty; The switching circuit includes a transistor and a field effect transistor, the base of the transistor is coupled to the control device, and the emitter of the transistor is grounded; the gate of the field effect transistor is connected to the collector of the transistor, the fan is connected to the drain of the field effect transistor, and the power supply is connected to the source of the field effect transistor.

2. The air conditioner fault detection device according to claim 1, It is characterized in that The switch circuit further comprises: A first protection circuit, wherein one end of the first protection circuit is coupled to the base of the transistor, and the other end of the first protection circuit is grounded; A second protection circuit, wherein one end of the second protection circuit is connected to the collector of the transistor, and the other end of the second protection circuit is connected to a power supply.

3. The air conditioning fault detection device according to claim 2, It is characterized in that The switching circuit also includes a third protection circuit, which includes a first capacitor and a second capacitor, wherein a common end of the first capacitor and the second capacitor is coupled to the collector of the transistor, the other end of the first capacitor is coupled to the source of the field effect transistor, and the other end of the second capacitor is coupled to the drain of the field effect transistor.

4. The air conditioning fault detection device according to claim 2, It is characterized in that The second protection circuit includes a diode, an anode of the diode is coupled to the collector of the transistor, and a cathode of the diode is coupled to the power supply.

5. A method for detecting air conditioner faults, It is characterized in that The air conditioning fault detection method comprises: The control device controls the fan to start and determines whether the speed of the fan is lower than a preset speed; If the speed of the fan is not lower than the preset speed, the fan is normal; If the speed of the fan is lower than the preset speed, the control device controls the fan to shut down, and determines whether the number of starts of the fan reaches a preset number; If the number of times the fan is started does not reach the preset number, executing the step of controlling the fan to start and determining whether the speed of the fan is lower than the preset speed; If the number of times the fan is started reaches the preset number, information about the abnormality of the fan is output.

6. The air conditioning fault detection method according to claim 5, It is characterized in that The control device controls the fan to start, and the step of judging whether the speed of the fan is lower than a preset speed comprises: Controlling the power supply to supply power to the fan by the control device; The control device records the start-up time of the fan and collects the rotation speed of the fan; After the start-up time of the fan reaches a first preset time, it is determined whether the rotation speed of the fan is lower than the preset rotation speed.

7. The air conditioner fault detection method according to claim 5, It is characterized in that If the fan speed is lower than the preset speed, the control device controls the fan to shut down, and the step of judging whether the fan startup times reaches the preset times comprises: The control device controls the power supply to stop supplying power to the fan; The control device obtains the number of startups of the fan and determines whether the number of startups of the fan reaches the preset number.

8. The air conditioner fault detection method according to claim 5, It is characterized in that If the number of times the fan is started does not reach the preset number, the step of executing the control device to control the fan to start, and determining whether the speed of the fan is lower than the preset speed includes: The control device obtains the time after the fan is shut down. After the shutdown time of the fan reaches a second preset time, the control device controls the fan to start and determines whether the speed of the fan is lower than the preset speed.

9. The air conditioning fault detection method according to claim 5, It is characterized in that If the rotation speed is not lower than the preset rotation speed, the step of the fan being normal includes: The rotation speed of the fan is controlled by the control device.

10. The air conditioning fault detection method according to any one of claims 5 to 9, It is characterized in that The air conditioning fault detection method is executed by an air conditioning fault detection device.

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