CN113565786B - System for detecting upwind starting capability of direct current fan of air conditioner outdoor unit - Google Patents
System for detecting upwind starting capability of direct current fan of air conditioner outdoor unit Download PDFInfo
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- CN113565786B CN113565786B CN202110854756.2A CN202110854756A CN113565786B CN 113565786 B CN113565786 B CN 113565786B CN 202110854756 A CN202110854756 A CN 202110854756A CN 113565786 B CN113565786 B CN 113565786B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Air Conditioning Control Device (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The embodiment of the specification provides a detection system for the upwind starting capability of a direct current fan of an air conditioner outdoor unit, the system comprises an upwind detection subsystem and a fan control subsystem, the upwind detection subsystem comprises a controller, a display, a comparator, a relay and a power supply, the controller is respectively connected with the output end of the comparator, the input end of the display and the switch control end of the relay, and the two ends of a normally open switch of the relay are respectively connected with the power supply and the fan control subsystem; the two input ends of the comparator are connected with any two of three-phase output ports of the fan, the fan control subsystem is connected with the fan, the upwind detection subsystem is used for judging whether the fan rotates under the action of simulated wind power when not started, and if so, the relay is closed; the fan control subsystem is used for calculating the rotating speed of the fan after power-on and testing the upwind starting capability of the fan. The invention realizes the upwind starting of different gears under the effect of external wind by testing the passing fan, and realizes the normal operation of the air conditioner.
Description
Technical Field
One or more embodiments of the present disclosure relate to the field of air conditioning technologies, and in particular, to a system for detecting upwind starting capability of a dc fan of an outdoor unit of an air conditioner.
Background
At present, the application of the brushless DC motor in an air conditioner is a trend of the industry, and the application of the sensorless driving technology in motor control is very mature. The use of a position-free sensor in a brushless dc motor has the advantages of reduced cost, increased hardware reliability, complete external placement of the driver in harsh application environments, and the like. When the direct current brushless fan is reversed due to the strong wind, the air conditioner outdoor unit is required to be normally started to help the whole air conditioner system to perform thermal cycle. How to judge the upwind starting capability of a fan is always a problem to be solved by the industry.
Disclosure of Invention
One or more embodiments of the present disclosure describe a system for detecting upwind starting capability of a dc fan of an outdoor unit of an air conditioner.
The invention provides a detection system for upwind starting capability of a direct current fan of an air conditioner outdoor unit, which comprises an upwind detection subsystem and a fan control subsystem, wherein the upwind detection subsystem comprises: the controller is respectively connected with the output end of the comparator, the input end of the display and the switch control end of the relay, and the two ends of a normally open switch of the relay are respectively connected with the power supply and the fan control subsystem; two input ends of the comparator are connected with any two of three-phase output ports of a fan, and the fan control subsystem is connected with the fan;
the controller in the upwind detection subsystem is configured to: judging whether the fan rotates under the action of simulated wind power when not started according to the output data of the comparator, if so, controlling the switch control end to enable a normally open switch of the relay to be closed so that the power supply supplies power to the fan control subsystem;
the fan control subsystem is used for: calculating the rotating speed of the fan under the action of simulated wind power when the fan is not started after power is on, and respectively testing the upwind starting capability of the fan at a plurality of preset gears; the test process for the upwind starting capability of the fan under each preset gear comprises the following steps of;
s110, judging whether the rotating speed of the fan under the action of simulated wind power is smaller than the maximum rotating speed corresponding to the preset gear when the fan is not started; if yes, executing S120;
s120, controlling the fan to start, starting timing, and judging whether the fan is started successfully in an upwind state when the timing time length reaches a preset time length;
s130, if the starting is successful, recording continuous successful starting times, and judging whether the continuous successful starting times reach preset times or not; if the preset times are reached, determining that the upwind starting capability of the fan under the preset gear meets the working requirement, judging whether the preset gear is the highest gear, if so, ending the whole upwind starting capability test of the fan, and displaying that the whole upwind starting capability test of the fan passes through the controller on the display, and jumping to S200; if the speed is not the high speed gear, returning to the S110, and performing an upwind starting capability test of the next gear on the fan, wherein the rotating speed corresponding to the next gear is higher than the rotating speed corresponding to the current gear; if the continuous successful start times are not reached, returning to S120, and performing the next test on the upwind start capability of the fan under the preset gear;
s140, if the starting is unsuccessful, determining that the upwind starting capability of the fan in the preset gear does not meet the working requirement, ending the whole upwind starting capability test of the fan, and displaying that the upwind starting capability of the fan in the preset gear does not pass through on the display through the controller, and jumping to S200;
and S200, controlling the switch control end through the controller so as to disconnect a normally open switch of the relay.
According to the detection system for the upwind starting capability of the direct-current fan of the air conditioner outdoor unit, the controller judges whether the fan rotates under the action of simulated wind power when the fan is not started through the output signal of the comparator, if the fan rotates, the relay is closed, so that the power supply provides power for the fan control subsystem, the fan control subsystem calculates the rotating speed of the fan under the action of simulated wind power when the fan is not started after power-on, the upwind starting capability test is respectively carried out on the fan under a plurality of preset gears, the test process is carried out according to the sequence from the low-speed gear to the high-speed gear, the upwind starting capability test process of the next gear can be started only after the upwind starting capability test of the previous gear is passed, the whole upwind starting capability test is successful after the upwind starting capability test of the highest gear is passed, and the whole upwind starting capability test fails as long as the fan is failed in one time, the whole upwind starting capability test can meet the working requirements of the fan, and the whole upwind system passing the test can be started under the action of different natural wind in the actual application scenes, and the whole air conditioner can be normally operated under the action of different natural wind. The detection system provided by the invention has the advantages that the participation of personnel in the whole test process is small through the combination of hardware and software, the objectivity of the test result is improved, the human error is reduced, and the detection accuracy is improved.
Drawings
In order to more clearly illustrate the embodiments of the present description or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present description, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram illustrating a connection between a fan and a system for detecting upwind starting capability of a DC fan of an air conditioner outdoor unit according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of the output waveform of the comparator in one embodiment of the present disclosure;
FIG. 3 is a schematic diagram of the connection of a comparator to a three-phase port of a blower in one embodiment of the present disclosure;
fig. 4 is a circuit diagram of a failure indicator in one embodiment of the present disclosure.
Detailed Description
The following describes the scheme provided in the present specification with reference to the drawings.
In a first aspect, the present invention provides a system for detecting an upwind start capability of a dc fan of an outdoor unit of an air conditioner, as shown in fig. 1 and 3, where the system includes an upwind detection subsystem and a fan control subsystem, and the upwind detection subsystem includes: the controller is respectively connected with the output end of the comparator, the input end of the display and the switch control end of the relay, and the two ends of the normally open switch of the relay are respectively connected with the power supply and the fan control subsystem; two input ends of the comparator are connected with any two of three-phase output ports of the fan, and the fan control subsystem is connected with the fan.
Wherein the controller in the upwind detection subsystem is configured to: judging whether the fan rotates under the action of simulated wind power when not started according to the output data of the comparator, and if so, controlling the switch control end to enable the normally open switch of the relay to be closed so that the power supply supplies power to the fan control subsystem.
It will be appreciated that when the fan is not activated, it is rotated by the simulated wind force, and the ports of the fan will output three-phase voltages W, U, V. If the fan does not rotate, the fan does not have an output signal. According to the method, whether the fan rotates or not can be judged.
In the implementation, any two of the three-phase output ports of the fan can be connected with two input ends of the comparator, so that the comparator outputs signals after the voltages of the any two output ports are compared. If the signal output by the comparator is a sawtooth wave as shown in fig. 2, the fan is rotated at the moment. And if the signal output by the comparator is 0 or the signal output by the comparator is not output, the fan is not rotated at the moment.
Correspondingly, the controller may be specifically configured to: and determining output waveforms of any two port voltages in the three-phase port voltages after passing through the comparator, if the output waveforms are saw-tooth waves formed by high level and low level alternately, determining that the fan rotates under the action of simulated wind power, and controlling the switch control end to enable a normally open switch of the relay to be closed. When the normally open switch is closed, the power supply can supply power to the fan control subsystem.
It can be understood that the detection system provided by the invention is applied to a laboratory or a detection room environment, and the upwind starting capability of the direct current fan of the air conditioner outdoor unit is detected in a mode that the wind source simulates external natural wind.
Wherein, fan control subsystem is used for: and after power-on, calculating the rotating speed of the fan under the action of simulated wind power when the fan is not started, and respectively testing the upwind starting capability of the fan at a plurality of preset gears.
It will be appreciated that the controller and fan control subsystem may be connected by wire or wirelessly so that relevant data may be communicated. For example, the controller sends the saw-tooth wave obtained from the comparator to the fan control subsystem, or sends the relevant data of the saw-tooth wave to the fan control subsystem, so that the fan control subsystem calculates the rotating speed of the fan under the action of simulated wind power when the fan is not started according to the relevant data.
In a specific implementation, the fan control subsystem may calculate a rotational speed of the fan under the action of the simulated wind force when the fan is not started by using a first formula, where the first formula includes:
R＝1/(T*P)*60
wherein R is the rotating speed of the fan under the action of simulated wind power when the fan is not started, T is the half period of the sawtooth waveform, and P is the pole pair number of the fan.
It is understood that the preset gear may include a low gear, a medium gear, and a high gear, and the fan has a certain rotational speed range in each gear. Firstly, testing the upwind starting capability under the low-speed gear, and then testing the upwind starting capability of the medium-speed gear after the test is passed, otherwise, testing the upwind starting capability of the medium-speed gear; and after the test is passed in the middle speed gear, performing the upwind capability test of the high speed gear, and when the upwind capability test is passed in the high speed gear, namely, the whole upwind starting capability test of the fan is passed. It can be seen that the upwind start capability test is performed in the order of the low gear, the medium gear and the high gear, and the upwind start capability test of the next gear is performed only after the upwind start capability test of the previous gear passes.
The fan control subsystem tests the upwind starting capability of the fan in each preset gear, and the upwind starting capability test process comprises the following steps of;
s110, judging whether the rotating speed of the fan under the action of simulated wind power is smaller than the maximum rotating speed corresponding to the preset gear when the fan is not started; if yes, executing S120;
it can be understood that if the rotation speed of the fan under the action of the simulated wind force is less than the maximum rotation speed corresponding to the preset gear when the fan is not started, the subsequent steps are executed, and the upwind starting capability under the gear is tested.
S120, controlling the fan to start, starting timing, and judging whether the fan is started successfully in an upwind state when the timing time length reaches a preset time length;
at this time, the fan control subsystem starts the fan and counts the time at the same time, and judges whether the start is successful or not after the counted time length reaches a certain time length.
It will be appreciated that after successful start-up, the fan speed is opposite to the speed at which it was not started, and is therefore referred to as upwind start.
In specific implementations, whether the upwind start of the fan is successful can be determined in a plurality of ways, and one of the following is provided: the controller is used for acquiring output waveforms of any two-phase port voltages in the three-phase port voltages after the fan is started after passing through the comparator, and if the frequency of the output waveforms is greater than a preset threshold value, the fan is started successfully; otherwise, the starting fails; the frequency of the output waveform of any two port voltages of the three-phase port voltages before the fan is started after the three-phase port voltages pass through the comparator is lower than the preset threshold value.
The waveform output by the comparator is obtained from the controller, the frequency of the waveform is determined, whether the frequency is larger than a preset threshold value is judged, and whether the fan is started successfully in the upwind state is further determined. The preset threshold value can be used to distinguish the waveform output by the comparator before and after the fan is started. Typically, the frequency of the output waveform of the comparator is between 1K and 2KHZ before the start-up, and between 4K and 5KHZ after the start-up, a value between the two ranges can be selected as the preset threshold.
S130, if the starting is successful, recording continuous successful starting times, and judging whether the continuous successful starting times reach preset times or not; if the preset times are reached, determining that the upwind starting capability of the fan under the preset gear meets the working requirement, judging whether the preset gear is the highest gear, if so, ending the whole upwind starting capability test of the fan, and displaying that the whole upwind starting capability test of the fan passes through the controller on the display, and jumping to S200; if the speed is not the high speed gear, returning to the S110, and performing an upwind starting capability test of the next gear on the fan, wherein the rotating speed corresponding to the next gear is higher than the rotating speed corresponding to the current gear; if the continuous successful start times are not reached, returning to S120, and performing the next test on the upwind start capability of the fan under the preset gear;
that is, if the starting is successful, the number of consecutive successful starts in the preset gear is increased by 1, and the initial value of the number of consecutive successful starts corresponding to each preset gear is 0. If the number of continuous successful starts reaches the preset number, the upwind starting capability test under the gear is successful. Next, it is determined whether the current gear is the highest gear (e.g., high-speed gear), and if not, an upwind start capability test in the next gear is performed, that is, the preset gear is updated to the next gear, and S110 is returned, so that the upwind start capability in the next gear is tested. And if the current gear is the highest gear, the test of the upwind starting capability under all gears is successful, and the whole upwind starting capability test of the fan is successful, so that S200 can be entered. If the number of consecutive successful starts in the current gear does not reach the preset number, the upwind start capability in the current gear needs to be tested, and the process returns to S120.
S140, if the starting is unsuccessful, determining that the upwind starting capability of the fan in the preset gear does not meet the working requirement, ending the whole upwind starting capability test of the fan, and displaying that the upwind starting capability of the fan in the preset gear does not pass through on the display through the controller, and jumping to S200;
that is, if the start fails, it indicates that the upwind start capability of the fan in the preset gear is not satisfactory, the upwind start capability test is not needed, the whole upwind start capability test is finished, and relevant information is displayed on the display to remind the testers of knowing the test result.
And S200, controlling the switch control end through the controller so as to disconnect a normally open switch of the relay.
It will be appreciated that the power supply need not power the fan control subsystem after the test is completed, whether the test is successful or failed, and thus the controller is caused to control the switch control terminal to cause the normally open switch of the relay to open.
In a specific implementation, before determining in S110 whether the rotation speed is less than the maximum rotation speed corresponding to the preset gear, the fan control subsystem may be further configured to:
judging whether the rotating speed of the fan under the action of simulated wind power is smaller than a preset rotating speed upper limit value when the fan is not started; the preset rotating speed upper limit value is larger than the maximum rotating speed corresponding to each preset gear; and if yes, allowing the step of judging whether the rotating speed is smaller than the maximum rotating speed corresponding to the preset gear or not.
It will be appreciated that the speed of the fan cannot be too high because of power limitation and that if the fan speed is high, heat can be taken away as well, without having to perform subsequent steps. Therefore, the subsequent upwind starting capability test step is only carried out when the rotating speed of the fan under the action of the simulated wind force is smaller than the preset rotating speed upper limit value when the fan is not started.
Of course, if the rotation speed of the fan under the action of the simulated wind force is greater than or equal to the preset rotation speed upper limit value when the fan is not started, the controller can display the rotation speed of the fan under the action of the simulated wind force on the display, so that personnel can adjust the relative position and the relative angle between the wind source of the simulated wind force and the fan, and the rotation speed of the fan under the action of the simulated wind force is smaller than the preset rotation speed upper limit value when the fan is not started.
That is, the distance and angle between the wind source simulating wind power and the fan can be adjusted by the personnel at the moment, so that the rotating speed of the fan under the action of the simulated wind power is smaller than the preset rotating speed upper limit value when the fan is not started, and the subsequent upwind starting capability test step is performed.
In particular implementations, in S110, the fan control subsystem may also be configured to: if the rotating speed of the fan under the action of the simulated wind power is larger than or equal to the maximum rotating speed corresponding to the preset gear when the fan is not started, the rotating speed of the fan under the action of the simulated wind power is displayed on the display through the controller, so that a person can adjust the relative position and the relative angle between the wind source of the simulated wind power and the fan, and the rotating speed of the fan under the action of the simulated wind power when the fan is not started is smaller than the maximum rotating speed corresponding to the preset gear and smaller than the preset rotating speed upper limit value.
That is, if the rotational speed of the fan under the action of the simulated wind force is greater than or equal to the maximum rotational speed corresponding to the preset gear when the fan is not started, the step of testing the upwind starting capability under the gear cannot be entered at the moment, but the rotational speed at the moment is displayed on a display to remind, personnel can adjust the wind source, so that the rotational speed of the fan under the action of the simulated wind force is smaller than the maximum rotational speed corresponding to the preset gear when the fan is not started, and the rotational speed of the fan under the action of the simulated wind force is also smaller than the preset rotational speed upper limit value when the fan is not started.
Therefore, the fan rotating speed is smaller than the preset rotating speed upper limit value, which is a big premise that the whole upwind starting capability test can be entered, the whole upwind starting capability test can be entered only when the fan rotating speed is smaller than the preset rotating speed upper limit value, and the maximum rotating speed corresponding to the fan rotating speed smaller than the preset gear is a premise that the upwind starting capability test of the preset gear is entered, and the upwind starting capability test under the preset gear can be entered only if the premise is satisfied.
According to the system for detecting the upwind starting capability of the direct-current fan of the air conditioner outdoor unit, the controller judges whether the fan rotates under the action of simulated wind power when the fan is not started or not through the output signal of the comparator, if the fan rotates, the relay is closed, so that the power supply supplies power to the fan control subsystem, the fan control subsystem calculates the rotating speed of the fan under the action of the simulated wind power when the fan is not started after power is supplied, the upwind starting capability tests are respectively carried out on the fan under a plurality of preset gears, the test process is carried out according to the sequence from the low speed gear to the high speed gear, the upwind starting capability test process of the next gear can be carried out only after the upwind starting capability test under the previous gear is passed, the whole upwind starting capability test is successful after the upwind starting capability test under the highest gear is passed, the whole upwind starting capability test fails as long as the fan control subsystem is powered on, the whole upwind starting capability test fails, the whole upwind system can meet the working requirements of the fan under the action of the outside natural wind, and the whole system can be normally started under the action of different natural wind in the actual application scene. The detection system provided by the invention has the advantages that the participation of personnel in the whole test process is small through the combination of hardware and software, the objectivity of the test result is improved, the human error is reduced, and the detection accuracy is improved.
Further, in order to more intuitively remind a person when the upwind start fails, the upwind detection subsystem may further include a failure prompter, where the failure prompter is connected to the controller, and the controller may be further configured to: and after receiving the information of failed detection sent by the fan control subsystem, outputting high level to the failure prompter so as to enable a prompting lamp in the prompter to be lighted.
That is, after the controller receives the test failure message sent by the fan control subsystem, the controller can inform the personnel by illuminating the indicator light in the failure indicator.
In practice, the circuit structure of the failure indicator may be various, and one of them is provided below, but of course, in practice, the circuit structure is not limited to the one provided below:
as shown in fig. 4, the failure prompter may include a first transistor Q1, a second transistor Q2, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4, wherein: the first triode Q1 is an NPN triode, and the second triode Q2 is a PNP triode; the base electrode of the first triode Q1 is connected with one output end of the controller, the emitting electrode of the first triode Q1 is grounded, the collecting electrode of the first triode Q1 is connected with one end of a first resistor, the other end of the first resistor R1 is connected to the base electrode of the second triode Q2 and one end of a second resistor R2, and the other end of the second resistor is connected with a preset voltage source; the emitter of the second triode is connected with the preset voltage source, the collector of the second triode is connected to one end of a fourth resistor R4 and one end of a third resistor R3, the other end of the fourth resistor is grounded, and the other end of the third resistor is connected with the prompting lamp.
It can be understood that when the controller outputs a high level, the base of the first triode is made to be high level, the first triode is conducted, the branch of the preset voltage source, the emitter of the second triode, the base of the second triode, the first resistor, the collector of the first triode, the emitter of the first triode and the grounding end is conducted, the base voltage of the second triode is pulled down, the second triode is conducted, and the branch of the preset voltage source, the emitter of the second triode, the collector of the second triode, the third resistor, the indicator lamp and the grounding end is conducted, so that the indicator lamp is lighted. If the controller outputs low level, the two triodes are cut off, and the prompting lamp is turned off.
After the first triode is conducted, the base electrode of the second triode is pulled down by the first triode, and the collector electrode of the second triode is pulled down by the third resistor, so that the second triode is conducted. When the first triode is cut off, the second resistor pulls the base voltage of the second triode high, and therefore the second triode is cut off.
In a specific implementation, the failure prompter may further include a diode VD and a capacitor C, where an anode of the diode is connected to an output end of the controller, a cathode of the diode is connected to the prompting lamp, one end of the capacitor is connected to a collector of the second triode, and the other end of the sixth capacitor is grounded.
It can be understood that if the indicator light has a short circuit, the base of the first triode can be quickly pulled down by the diode, so that the two triodes can enter the cut-off state, but cannot be damaged, and when the short circuit fault disappears, the circuit can resume normal operation. After the normal operation is resumed, the cathode voltage of the diode is higher than the anode voltage, so the diode is in an off state. It can be seen that the provision of a diode protects both transistors. The capacitor is arranged to prevent instantaneous malfunction and prevent reverse breakdown of the triode, and also to protect the triode.
In a specific implementation, the failure prompter further comprises a protective tube, and the protective tube is arranged between the connection point of the fourth resistor and the collector electrode of the second triode and the prompting lamp.
That is, one end of the protective tube is connected with the indicator light, and the other end of the protective tube is connected with a connecting point, wherein the connecting point is a connecting point of the fourth resistor and the collector electrode of the second triode. The function of setting up the protective tube is when preventing the warning light short circuit, and the second triode is broken down, so plays further guard action to the second triode.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments in part.
Those skilled in the art will appreciate that in one or more of the examples described above, the functions described in the present invention may be implemented in hardware, software, a pendant, or any combination thereof. When implemented in software, these functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention in further detail, and are not to be construed as limiting the scope of the invention, but are merely intended to cover any modifications, equivalents, improvements, etc. based on the teachings of the invention.
Claims (8)
1. An upwind start capability detection system of a direct current fan of an air conditioner outdoor unit, which is characterized by comprising an upwind detection subsystem and a fan control subsystem, wherein the upwind detection subsystem comprises: the controller is respectively connected with the output end of the comparator, the input end of the display and the switch control end of the relay, and the two ends of a normally open switch of the relay are respectively connected with the power supply and the fan control subsystem; two input ends of the comparator are connected with any two of three-phase output ports of a fan, and the fan control subsystem is connected with the fan; wherein:
the controller in the upwind detection subsystem is configured to: judging whether the fan rotates under the action of simulated wind power when not started according to the output data of the comparator, if so, controlling the switch control end to enable a normally open switch of the relay to be closed so that the power supply supplies power to the fan control subsystem;
the fan control subsystem is used for: calculating the rotating speed of the fan under the action of simulated wind power when the fan is not started after power is on, and respectively testing the upwind starting capability of the fan at a plurality of preset gears; the test process for the upwind starting capability of the fan under each preset gear comprises the following steps of;
s110, judging whether the rotating speed of the fan under the action of simulated wind power is smaller than the maximum rotating speed corresponding to the preset gear when the fan is not started; if yes, executing S120;
s120, controlling the fan to start, starting timing, and judging whether the fan is started successfully in an upwind state when the timing time length reaches a preset time length;
s130, if the starting is successful, recording continuous successful starting times, and judging whether the continuous successful starting times reach preset times or not; if the preset times are reached, determining that the upwind starting capability of the fan under the preset gear meets the working requirement, judging whether the preset gear is the highest gear, if so, ending the whole upwind starting capability test of the fan, and displaying that the whole upwind starting capability test of the fan passes through the controller on the display, and jumping to S200; if the speed is not the high speed gear, returning to the S110, and performing an upwind starting capability test of the next gear on the fan, wherein the rotating speed corresponding to the next gear is higher than the rotating speed corresponding to the current gear; if the continuous successful start times are not reached, returning to S120, and performing the next test on the upwind start capability of the fan under the preset gear;
s140, if the starting is unsuccessful, determining that the upwind starting capability of the fan in the preset gear does not meet the working requirement, ending the whole upwind starting capability test of the fan, and displaying that the upwind starting capability of the fan in the preset gear does not pass through on the display through the controller, and jumping to S200;
s200, controlling the switch control end through the controller to enable a normally open switch of the relay to be disconnected;
wherein, the controller is specifically used for: determining output waveforms of any two port voltages in the three-phase port voltages after passing through a comparator, if the output waveforms are saw-tooth waves formed by high level and low level alternately, determining that the fan rotates under the action of simulated wind power, and controlling the switch control end to enable a normally open switch of the relay to be closed;
wherein, judge in the fan control subsystem whether the fan starts successfully under the upwind state, include: the controller is used for acquiring output waveforms of any two-phase port voltages in the three-phase port voltages after the fan is started after passing through the comparator, and if the frequency of the output waveforms is greater than a preset threshold value, the fan is started successfully; otherwise, the starting fails; the frequency of the output waveform of any two port voltages of the three-phase port voltages before the fan is started after the three-phase port voltages pass through the comparator is lower than the preset threshold value.
2. The system of claim 1, wherein the fan control subsystem calculates a rotational speed of the fan under simulated wind when not activated using a first formula comprising:
R＝1/(T*P)*60
wherein R is the rotating speed of the fan under the action of simulated wind power when the fan is not started, T is the half period of the sawtooth waveform, and P is the pole pair number of the fan.
3. The system of claim 1, wherein the fan control subsystem, prior to determining whether the rotational speed is less than a maximum rotational speed corresponding to the preset gear, is further configured to:
judging whether the rotating speed of the fan under the action of simulated wind power is smaller than a preset rotating speed upper limit value when the fan is not started; the preset rotating speed upper limit value is larger than the maximum rotating speed corresponding to each preset gear; and if yes, allowing the step of judging whether the rotating speed is smaller than the maximum rotating speed corresponding to the preset gear or not.
4. The system of claim 3, wherein the fan control subsystem is further configured to: if the rotating speed of the fan under the action of the simulated wind power is larger than or equal to the maximum rotating speed corresponding to the preset gear when the fan is not started, the rotating speed of the fan under the action of the simulated wind power is displayed on the display through the controller, so that a person can adjust the relative position and the relative angle between the wind source of the simulated wind power and the fan, and the rotating speed of the fan under the action of the simulated wind power when the fan is not started is smaller than the maximum rotating speed corresponding to the preset gear and smaller than the preset rotating speed upper limit value.
5. The system of claim 1, wherein the upwind detection subsystem further comprises a failure indicator, the controller further configured to: and after receiving the information of failed detection sent by the fan control subsystem, outputting high level to the failure prompter so as to enable a prompting lamp in the prompter to be lighted.
6. The system of claim 5, wherein the failure indicator comprises a first transistor, a second transistor, a first resistor, a second resistor, a third resistor, and a fourth resistor, wherein: the first triode is an NPN triode, and the second triode is a PNP triode; the base electrode of the first triode is connected with one output end of the controller, the emitting electrode of the first triode is grounded, the collecting electrode of the first triode is connected with one end of a first resistor, the other end of the first resistor is connected to the base electrode of the second triode and one end of a second resistor, and the other end of the second resistor is connected with a preset voltage source; the emitter of the second triode is connected with the preset voltage source, the collector of the second triode is connected to one end of a fourth resistor and one end of a third resistor, the other end of the fourth resistor is grounded, and the other end of the third resistor is connected with the prompting lamp.
7. The system of claim 6, wherein the failure indicator further comprises a diode and a capacitor, wherein the anode of the diode is connected to the output terminal of the controller, the cathode of the diode is connected to the indicator light, one end of the capacitor is connected to the collector of the second triode, and the other end of the capacitor is grounded.
8. The system of claim 6, wherein the failure indicator further comprises a fuse disposed between a junction of the fourth resistor and a collector of the second transistor and the indicator light.
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| CN202110854756.2A CN113565786B (en) | 2021-07-28 | 2021-07-28 | System for detecting upwind starting capability of direct current fan of air conditioner outdoor unit |
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| CN201015973Y (en) * | 2007-03-09 | 2008-02-06 | 刘爱明 | Freight transportation alarm |
| CN204017376U (en) * | 2014-09-06 | 2014-12-17 | 星辉互动娱乐股份有限公司 | A kind of telecontrolled aircraft induction alarm set |
| CN204662603U (en) * | 2015-04-16 | 2015-09-23 | 梅照付 | A kind of bathroom flush toilet water level caution circuit |
| CN107576518B (en) * | 2017-07-17 | 2020-03-06 | 珠海格力电器股份有限公司 | Fan testing method, device and system |
| CN109751720B (en) * | 2018-12-18 | 2020-12-15 | 珠海格力电器股份有限公司 | Air conditioner external fan upwind starting control method and circuit and air conditioner |
| CN110966243B (en) * | 2019-11-05 | 2021-01-15 | 珠海格力电器股份有限公司 | Upwind rotating speed detection and soft start control method and system for air conditioner fan |
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