Control method of air conditioning system and air conditioning system

Abstract

The present application relates to the technical field of air conditioners, and particularly provides a control method of an air conditioning system and the air conditioning system, aiming to solve the problem that the existing air conditioning system is difficult to automatically determine whether the air deflector is deviated. To this end, the control method of the air conditioning system provided by the present application comprises: acquiring actual operation parameters of an indoor fan and a count of driving pulses, and determining whether the air deflector is deviated according to the actual operation parameters and the count of driving pulses. The actual operation parameters include an actual operation current and an actual wind speed, a preset operation current of the indoor fan is acquired through the count of driving pulses and the actual wind speed, and then whether the air deflector is deviated is determined by comparing the actual operation current with the preset operation current. The determination process can be automatically completed in the air conditioning system and the result can be output, thereby reducing the possibility of failure during the operation of the air conditioner.

Description

Technical Field

[0001] This invention relates to the technical field of air conditioning, and specifically provides a control method for an air conditioning system and an air conditioning system. Background Technology

[0002] Air conditioning systems are common electrical devices widely used in indoor environments such as homes, office buildings, and factories to regulate indoor temperature. An air conditioning system includes a compressor, condenser, expansion valve, evaporator, and purification device. The compressor, condenser, expansion valve, and evaporator are connected sequentially through pipes, forming a circulation loop filled with refrigerant. The compressor compresses the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. The condenser liquefies the high-temperature, high-pressure gaseous refrigerant into a medium-temperature, medium-pressure liquid refrigerant, releasing heat to the outside. The liquid refrigerant enters the expansion valve for throttling, then passes through the evaporator to absorb heat, causing the liquid refrigerant to evaporate into a gaseous state. It then re-enters the compressor for compression and pressurization, repeating this cycle to achieve cooling or heating. Air conditioning systems that use the evaporator for cooling are called refrigeration units, and systems that use the condenser for heating are called heating units.

[0003] An air conditioning system, based on its installation location, includes an indoor unit and an outdoor unit. The evaporator is located inside the indoor unit, while the compressor, expansion valve, and condenser are located inside the outdoor unit. The indoor unit also includes an air guide vane, a stepper motor, and a fan. The fan and evaporator are both housed within the indoor unit's air duct. The air guide vane is located at the duct outlet. The stepper motor drives the air guide vane to swing up and down or left and right to adjust the airflow direction. The fan's rotation creates airflow, directing the airflow past the evaporator and out of the indoor unit under the guidance of the air guide vane.

[0004] Currently, the air deflector is driven by a stepper motor to oscillate. The opening position of the air deflector is controlled by adjusting the number of drive pulses from the stepper motor. The oscillation of the air deflector has a motion cycle. The number of drive pulses from the stepper motor within one motion cycle is fixed and recorded as the cycle value. Once the number of drive pulses reaches the cycle value, it is reset to zero and the counting starts again. The count value of the drive pulses corresponds to the position of the air deflector. Thus, by controlling the number of drive pulses, the air deflector is controlled to open to the preset position. The oscillation angle of the air deflector during normal operation is less than the maximum achievable oscillation angle.

[0005] The drawback of the aforementioned technology is that the stepper motor's step distance has inherent errors. Over prolonged use, these errors accumulate, causing the air guide plate to shift. This results in a discrepancy between the actual swing position of the air guide plate and the preset position corresponding to the number of drive pulses from the stepper motor. Timely correction of the air guide plate position is necessary to ensure accurate alignment with the number of drive pulses. Furthermore, if the air guide plate's swing position drifts to its extreme limit, it may be damaged. Currently, most air conditioning systems rely on users or staff to observe the air guide plate's position on-site to determine if it has shifted, which is difficult to achieve automatically and results in low efficiency.

[0006] Therefore, there is an urgent need for a control method and system for air conditioning systems to solve the problem that existing air conditioning systems cannot automatically determine whether the air guide vane is misaligned. Summary of the Invention

[0007] The present invention aims to solve the above-mentioned technical problem, namely, to solve the problem that existing air conditioning systems have difficulty in automatically determining whether the air guide plate is offset.

[0008] In a first aspect, the present invention provides a control method for an air conditioning system, the air conditioning system including an indoor unit fan, an air guide plate, and a stepper motor, the stepper motor being capable of controlling the air guide plate to swing according to drive pulses; the control method includes acquiring actual operating parameters of the indoor unit fan and a count of the drive pulses; and determining whether the air guide plate is offset based on the actual operating parameters and the count of the drive pulses.

[0009] In a specific implementation of the above control method, the actual operating parameters include the actual operating current and the actual wind speed; "determining whether the air guide plate is offset based on the actual operating parameters and the count of the drive pulses" includes: obtaining the preset operating current of the indoor unit fan based on the count of the drive pulses and the wind speed of the indoor unit fan; and determining whether the air guide plate is offset based on the preset operating current and the actual operating current.

[0010] In a specific implementation of the above control method, "determining whether the air guide plate is offset based on the preset operating current and the actual operating current" includes: if the difference between the actual operating current and the preset operating current is within a preset range, then it is determined that the air guide plate has not offset.

[0011] In a specific implementation of the above control method, "determining whether the air guide plate is offset based on the preset operating current and the actual operating current" further includes: if the difference between the actual operating current and the preset operating current exceeds a preset range, then it is determined that the air guide plate has offset.

[0012] In a specific implementation of the above control method, the actual operating parameters include the actual operating current, and the control method further includes: controlling the operating state of the indoor unit fan according to the actual operating current.

[0013] In a specific implementation of the above control method, "controlling the operating state of the indoor unit fan according to the actual operating current" includes: if the actual operating current is not greater than the first preset operating current, the indoor unit fan continues to operate; and / or, if the actual operating current is greater than the first preset operating current, the indoor unit fan is turned off.

[0014] In a specific implementation of the above control method, the control method further includes: correcting the position of the air guide plate according to the actual operating parameters and the count of the drive pulses.

[0015] In a specific implementation of the above control method, the actual operating parameters include the actual operating current and the actual wind speed; "correcting the position of the air guide plate according to the actual operating parameters and the count of the drive pulses" includes: obtaining a second preset operating current of the indoor unit fan according to the current count of the drive pulses and the actual wind speed; obtaining a third preset operating current according to the current count of the drive pulses plus a preset value and the actual wind speed; and correcting the count of the drive pulses according to the actual operating current, the second preset operating current, and the third preset operating current to correct the position of the air guide plate.

[0016] In a specific implementation of the above control method, "correcting the count of the drive pulse based on the actual operating current, the second preset operating current, and the third preset operating current" includes: if the difference between the actual operating current and the second preset operating current is greater than the difference between the actual operating current and the third preset operating current, then the current count of the drive pulse is increased by the preset value.

[0017] In a specific implementation of the above control method, "correcting the count of the drive pulse based on the actual operating current, the second preset operating current, and the third preset operating current" further includes: if the difference between the actual operating current and the second preset operating current is not greater than the difference between the actual operating current and the third preset operating current, then the current count of the drive pulse is reduced by the preset value.

[0018] In a second aspect, the present invention provides an air conditioning system, including a control module configured to execute the control method of the air conditioning system described above.

[0019] In a specific embodiment of the above-mentioned air conditioning system, the air conditioning system further includes an indoor unit fan, which is driven by a sensorless permanent magnet synchronous motor.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The air conditioning system control method provided by this invention includes: acquiring the actual operating parameters of the indoor unit fan and the count of drive pulses; and determining whether the air guide plate has shifted based on the actual operating parameters and the count of drive pulses. The actual operating parameters include the actual operating current and the actual wind speed. A preset operating current of the indoor unit fan is obtained by counting the drive pulses and the actual wind speed. The actual operating current is then compared with the preset operating current to determine whether the air guide plate has shifted. This determination process can be automatically completed and the result output within the air conditioning system, reducing the possibility of malfunctions during air conditioning operation. Attached Figure Description

[0022] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0023] Figure 1 This is a flowchart of the main steps of the control method for the air conditioning system provided by the present invention;

[0024] Figure 2 This is a flowchart illustrating the process of determining whether the air guide plate is offset based on actual operating parameters and drive pulse count in the control method provided by this invention.

[0025] Figure 3 This is a further flowchart of the control method provided by the present invention;

[0026] Figure 4 This is a flowchart illustrating the process of correcting the position of the air guide plate based on actual operating parameters and the counting of drive pulses in the control method provided by this invention.

[0027] Figure 5 This is a flowchart detailing the steps of the control method for the air conditioning system provided by the present invention. Detailed Implementation

[0028] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0029] It should be noted that in the description of this invention, terms such as "upper," "lower," "left," "right," "inner," and "outer," indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] To address the problem that existing air conditioning systems struggle to automatically determine whether the air deflector is misaligned, this invention provides an air conditioning system comprising an indoor unit and an outdoor unit.

[0032] The indoor unit contains an indoor fan, evaporator, air guide vane, and stepper motor. It also has an air duct. The evaporator is installed within the duct, and the air guide vane is installed at the duct's air outlet. The stepper motor drives the air guide vane to oscillate back and forth according to drive pulses provided by the system. The indoor fan circulates air within the duct, allowing heat exchange between the air and the evaporator before the air is blown into the room by the air guide vane. The drive pulses include positive and negative pulses. The stepper motor rotates forward upon receiving a positive pulse and reverses direction upon receiving a negative pulse. Under normal operating conditions, the air conditioning system continuously emits multiple positive pulses, causing the stepper motor to rotate forward and driving the air guide vane to rotate in the forward direction. Subsequently, it continuously emits multiple negative pulses, causing the stepper motor to rotate in the reverse direction and driving the air guide vane to rotate in the opposite direction, creating a periodic oscillation. Within one oscillation cycle of the air guide vane, the number of positive and negative pulses from the stepper motor is fixed, and the sum of the number of positive and negative pulses is recorded as the period value. The count of the driving pulses is the sum of the positive pulse count and the negative pulse count. When the count of the driving pulses reaches the period value, both the positive pulse count and the negative pulse count are reset to zero, and the counting starts again.

[0033] Under normal circumstances, the count value of the drive pulses corresponds to the position of the guide vane. Based on the count values ​​of positive and negative pulses, the position and opening degree of the guide vane can be accurately determined. Therefore, by controlling the number of drive pulses, the guide vane is controlled to open to the preset position. It should be noted that within each oscillation cycle, the number of positive pulses and negative pulses are equal. The greater the number of positive pulses, the larger the oscillation angle of the guide vane. Generally speaking, the normal oscillation angle of the guide vane is less than the maximum achievable oscillation angle, ensuring that the guide vane does not move to its limit and jam during normal operation, thus guaranteeing the safety of the guide vane and the stepper motor.

[0034] Regarding the counting of drive pulses, it should be noted that when the air conditioning system is turned off, it records the drive pulse count before shutdown and stores it within the system. When the system is turned on again, it reads the recorded drive pulse count as the initial value. When the air conditioning system experiences a power outage, the recorded drive pulse count may be cleared to zero, and the system will set the initial value to zero upon the next startup. If the memory used to store the drive pulse count is damaged, the system will be unable to read the drive pulse count recorded at the time of shutdown, and will also set the initial value to zero upon the next startup.

[0035] The operating parameters of the indoor unit fan include, but are not limited to, operating current and fan speed. Indoor unit fans generally have multiple fan speed modes, such as low, medium, and high. Each fan speed mode corresponds to a specific fan speed, and the fan speed mode can be determined based on the fan speed. Under a given fan speed, the operating current of the indoor unit fan is related to the opening degree of the air guide vane, that is, to the position of the air guide vane. The smaller the opening degree of the air guide vane, the greater the operating current of the indoor unit fan.

[0036] Specifically, under normal operating conditions, the drive pulse counts corresponding to the five preset positions of the air guide vane are recorded. These drive pulse counts are recorded as a preset data set within the air conditioning system. The operating current corresponding to the five preset positions of the air guide vane under three different fan speed modes is also recorded. When the drive pulse count is within the preset data set, the air guide vane reaches the preset position corresponding to that count. Specifically, in high fan speed mode, the operating currents corresponding to the five preset positions of the air guide vane are P1I... h P2I h P3I h P4I h P5I h In stroke mode, the operating current corresponding to the five preset positions of the air guide plate is P1I. m P2I m P3I m P4Im P5I m In low-wind mode, the operating current corresponding to the five preset positions of the air guide plate is P1I. l P2I l P3I l P4I l P5I l This data is stored in the air conditioning system. The system determines the operating mode of the indoor unit fan based on the wind speed and calculates the position information of the air guide plate based on the drive pulse count. This allows the system to determine the preset operating current of the indoor unit fan at the preset position of the air guide plate. This preset operating current is the operating current of the indoor unit fan when the air guide plate is not shifted. If the actual operating current of the indoor unit fan differs from the preset operating current, it indicates that the position of the air guide plate may have shifted.

[0037] It should be noted that, without departing from the principles of this invention, in other embodiments, those skilled in the art can experimentally increase the operating current of the indoor unit fan in three wind speed modes at different positions of the air guide plate (i.e., at different drive pulse counts) without the air guide plate shifting, thereby expanding the database content. Based on the database, a computer is used to fit the values ​​of the drive pulse counts and the indoor unit fan operating current under different wind speed modes, generating a functional relationship between the drive pulse counts and the indoor unit fan operating current, and storing this function within the air conditioning system. The air conditioning system can then calculate the preset operating current of the indoor unit fan at any time using this function, based on the indoor unit fan's operating wind speed and the collected drive pulse counts.

[0038] The indoor unit fan is driven by a sensorless permanent magnet synchronous motor. This motor does not have position sensors installed; instead, the rotor position and speed are estimated using the detected voltage and current of the permanent magnet synchronous motor and a mathematical model. The sensorless synchronous motor control system fundamentally avoids the drawbacks caused by adding mechanical sensors such as encoders, Hall effect sensors, and rotary transformers, such as motor shaft vibration, increased mechanical inertia, and reduced power density. In this invention, the operating current of the indoor unit fan can be obtained from the operating current collected by the sensorless permanent magnet synchronous motor when estimating the rotor position and speed. The operating current collected during the operation of the indoor unit fan can not only be used to estimate the motor rotor position and speed but also to determine whether the air guide vane has shifted.

[0039] The outdoor unit contains a compressor, expansion valve, and condenser. The compressor, condenser, expansion valve, and evaporator are connected in sequence through pipes to form a circulation loop. The loop is filled with refrigerant. The compressor can compress the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. The condenser liquefies the high-temperature, high-pressure gaseous refrigerant into a medium-temperature, medium-pressure liquid refrigerant and releases heat to the outside. The liquid refrigerant enters the expansion valve for throttling, and then passes through the evaporator to absorb heat, causing the liquid refrigerant to evaporate into a gaseous state. It then enters the compressor for compression and pressurization. This cycle repeats to achieve refrigeration.

[0040] Of course, in other implementations, the air conditioning system is also equipped with a four-way switching valve, which can change the direction of refrigerant flow at the compressor outlet. When the refrigerant flows to the condenser and returns from the evaporator, the air conditioning system performs cooling; when the refrigerant flows to the evaporator and returns from the condenser, the air conditioning system performs heating.

[0041] The air conditioning system provided by this invention also includes a control module for executing the control method of the air conditioning system. For example... Figure 1 As shown, the main steps of the control method for this air conditioning system are as follows:

[0042] S1. Obtain the actual operating parameters of the indoor unit fan and the count of drive pulses. The actual operating parameters of the indoor unit fan include, but are not limited to, the actual operating current and actual airflow speed of the indoor unit fan. The operating current can be single-phase current or line current. The count of drive pulses includes the count of positive pulses and the count of negative pulses, and the count of drive pulses is the sum of the counts of positive pulses and the count of negative pulses.

[0043] In this embodiment, the operating current corresponding to several positions of the air guide plate is selected, and several different drive pulses corresponding to these positions are counted to form a set of data. When the count of the drive pulses equals any number in the set of data, the actual operating parameters of the indoor unit fan are obtained. This effectively reduces the data capacity stored in the air conditioning system and reduces the computational load on the air conditioning system hardware.

[0044] It should be noted that, regarding when to obtain the actual operating parameters of the indoor unit fan, although this invention obtains the actual operating parameters of the indoor unit fan when the count of the drive pulses equals any number in the set of numbers, this is not a specific limitation of this invention. In other embodiments, the air conditioning system can obtain the actual operating parameters of the indoor unit fan at any time based on the count of the drive pulses.

[0045] S2. Determine whether the air guide plate is offset based on the actual operating parameters and the drive pulse count. The actual operating parameters include the actual operating current and the actual wind speed. The preset operating current of the indoor unit fan is obtained by counting the drive pulses and the actual wind speed. Then, the actual operating current is compared with the preset operating current to determine whether the air guide plate has offset. This judgment process can be automatically completed and the result is output in the air conditioning system, reducing the possibility of malfunctions during air conditioning operation.

[0046] Specifically, such as Figure 2 As shown, step S2, "Determine whether the air guide plate is offset based on the actual operating parameters and drive pulse count," includes:

[0047] S21. Obtain the preset operating current of the indoor unit fan based on the count of the drive pulses and the actual fan speed. The count of the drive pulses is the sum of the counts of positive pulses and negative pulses.

[0048] Specifically, the fan speed mode of the indoor unit can be determined based on the actual wind speed. Under normal operating conditions, the drive pulse counts corresponding to the five selected positions of the air guide vane are recorded, and the operating current of the air guide vane at the five selected positions is recorded for the three fan speed modes. In high fan speed mode, the operating currents corresponding to the five selected positions of the air guide vane are P1I... h P2I h P3I h P4I h P5I h In stroke mode, the operating current corresponding to the five selected positions of the air guide plate is P1I. m P2I m P3I m P4I m P5I m In low wind mode, the operating current corresponding to the five selected positions of the air guide plate is P1I. l P2I l P3I l P4I l P5I l This data is stored in the air conditioning system. After acquiring the count of drive pulses and the actual wind speed, the air conditioning system determines the wind speed mode of the indoor unit fan based on the wind speed, and then obtains the preset operating current of the indoor unit fan based on the count of drive pulses.

[0049] S22. Determine whether the air guide plate has shifted based on the preset operating current and actual operating current of the indoor unit fan. Specifically, this includes: if the difference between the actual operating current and the preset operating current is within a preset range, then the air guide plate has not shifted; if the difference between the actual operating current and the preset operating current is outside the preset range, then the air guide plate has shifted. Both the actual operating current and the preset operating current are the operating currents of the indoor unit fan.

[0050] Furthermore, such as Figure 3 As shown, the control method for the air conditioning system provided by the present invention further includes:

[0051] S3. Control the operating status of the indoor unit fan according to the actual operating current of the indoor unit fan, including: if the actual operating current is not greater than the first preset operating current, specifically, if the actual operating current is not greater than the first preset current, then the indoor unit fan operates normally; if the actual operating current is greater than the first preset operating current, specifically, if the actual operating current is greater than the first preset current, then the indoor unit fan stops.

[0052] The first preset current is the operating current of the indoor unit fan when all indoor unit duct outlets are closed and the fan is running at low speed. If the actual operating current of the indoor unit fan is greater than the first preset current, it indicates that the airflow from the duct is obstructed, which is very likely due to the baffle at the duct outlet being stuck, causing all duct outlets to be closed. In this case, the unit should be stopped and an alarm should be issued to remind the user to check.

[0053] S4. Correct the position of the air guide plate according to the actual operating parameters and the count of the drive pulses.

[0054] Specifically, such as Figure 4 As shown, "correcting the position of the air guide plate based on actual operating parameters and the counting of drive pulses" includes:

[0055] S41. Obtain the second preset operating current of the indoor unit fan based on the current count of the drive pulse and the actual wind speed.

[0056] S42. Obtain the third preset operating current by increasing the preset count based on the current count of the drive pulse and the actual wind speed.

[0057] S43. Correct the position of the air guide plate according to the actual operating current, the second preset operating current, and the third preset operating current. Specifically, this includes: if the difference between the actual operating current and the second preset operating current is greater than the difference between the actual operating current and the third preset parameter, it means that after correction in this way, the actual operating current is closer to the preset operating current (i.e., the third preset operating current), and the current count of the drive pulse is increased by a preset value; if the difference between the actual operating current and the second preset operating current is not greater than the difference between the actual operating current and the third preset parameter, it means that after correction in this way, the actual operating current is not closer to the preset operating current (i.e., the third preset operating current), and the current count of the drive pulse is decreased by a preset value.

[0058] If the current driving pulse is a positive pulse, the positive pulse count is increased or decreased; if the current driving pulse is a negative pulse, the negative pulse count is increased or decreased. Furthermore, if the positive pulse count, after increasing by a preset value, exceeds the maximum positive pulse count within a single cycle, the negative pulse count is increased after the positive pulse count reaches its maximum value; if the positive pulse count is lower than a preset value, the negative pulse count is decreased when the positive pulse count reaches zero. Similarly, if the negative pulse count, after increasing by a preset value, exceeds the maximum negative pulse count within a single cycle, the positive pulse count is increased after the negative pulse count reaches its maximum value; if the negative pulse count is lower than a preset value, the positive pulse count is decreased when the negative pulse count reaches zero.

[0059] like Figure 5 As shown, the detailed steps of the air conditioning system control method provided by the present invention are as follows:

[0060] S0. Air conditioning system turned on. After the air conditioning system is turned on, the baffle at the indoor unit's air duct outlet is lowered to open the air duct outlet. After a few seconds, the indoor unit's fan runs in low fan speed mode.

[0061] S1. Set the drive pulse count n = n1. n1 is the count of drive pulses when the air conditioning system is turned off. This data is stored in the air conditioning system after the air conditioning system is turned off. If no value of n1 is detected, set n1 to 0.

[0062] S2. Determine whether the count n of the driving pulse is within the preset number set. If the count n of the driving pulse is within the preset number set, then execute step S21; if the count n of the driving pulse is not within the preset number set, then execute step S22.

[0063] S21. Obtain the actual operating current I of the indoor unit fan and execute step S3.

[0064] S22. Set n = n + 1 and repeat step S2.

[0065] S3. Determine whether the actual operating current I is greater than the first preset operating current I1. If I is not greater than I1, then execute step S31; if I is greater than I1, then execute step S32.

[0066] S31. The indoor unit fan continues to run, and step S4 is executed.

[0067] S32. Turn off the indoor unit fan and issue an alarm signal.

[0068] S4. In the air conditioning system, the second preset operating current I2 of the indoor unit fan is calculated and obtained based on the current count n of the drive pulse and the actual wind speed.

[0069] S5. Determine whether the difference between the actual operating current I and the second preset operating current I2 is within a preset range. Specifically, determine whether the absolute value of the difference is less than or equal to the first preset value. If the difference between the actual operating current I and the second preset operating current I2 is within the preset range, then execute step S51; if the difference between the actual operating current I and the second preset operating current I2 is not within the preset range, then execute step S52.

[0070] S51. Confirm that the air guide plate has not shifted.

[0071] S52. Determine the offset of the air guide plate and proceed to step S6.

[0072] S6. Let m = n + x, where x is the preset value in the system and m is the count of the driving pulse after x is added.

[0073] S7. In the air conditioning system, the third preset operating current I3 of the indoor unit fan is calculated based on the count m after the count of the drive pulse is increased by x and the actual wind speed.

[0074] S8. Calculate the difference a between the actual operating current I and the second preset operating current I2, and calculate the difference b between the actual operating current I and the third preset operating current I3.

[0075] S9. Determine if a is greater than b. If a is greater than b, proceed to step S91; if a is not greater than b, proceed to step S92.

[0076] S91. Set n = m and repeat step S2.

[0077] S92. Set n = nx and repeat step S2.

[0078] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A control method for an air conditioning system, the air conditioning system comprising an indoor unit fan, an air guide vane, and a stepper motor, wherein the stepper motor is capable of controlling the air guide vane to oscillate according to drive pulses, characterized in that, The control method includes: Obtain the actual operating parameters of the indoor unit fan and the count of the drive pulses; The deviation of the air guide plate is determined based on the actual operating parameters and the count of the drive pulses. The actual operating parameters include the actual operating current and the actual wind speed; The second preset operating current of the indoor unit fan is obtained based on the current count of the drive pulse and the actual wind speed; The third preset operating current is obtained by increasing the current count of the driving pulse by a preset value and by the actual wind speed. The count of the drive pulses is corrected based on the actual operating current, the second preset operating current, and the third preset operating current to correct the position of the air guide plate.

2. The control method for the air conditioning system according to claim 1, characterized in that, "Determining whether the air guide plate is offset based on the actual operating parameters and the count of the drive pulses" includes: The preset operating current of the indoor unit fan is obtained based on the count of the drive pulses and the wind speed of the indoor unit fan. The deviation of the air guide plate is determined based on the preset operating current and the actual operating current.

3. The control method for the air conditioning system according to claim 2, characterized in that, "Determining whether the air guide plate is offset based on the preset operating current and the actual operating current" includes: If the difference between the actual operating current and the preset operating current is within the preset range, then it is determined that the air guide plate has not shifted.

4. The control method for the air conditioning system according to claim 2, characterized in that, "Determining whether the air guide plate is offset based on the preset operating current and the actual operating current" also includes: If the difference between the actual operating current and the preset operating current exceeds the preset range, it is determined that the air guide plate has shifted.

5. The control method for an air conditioning system according to claim 1, characterized in that: "Correcting the count of the drive pulses based on the actual operating current, the second preset operating current, and the third preset operating current" includes: If the difference between the actual operating current and the second preset operating current is greater than the difference between the actual operating current and the third preset operating current, then the current count of the drive pulse is increased by the preset value.

6. The control method for an air conditioning system according to claim 1, characterized in that: "Correcting the count of the drive pulses based on the actual operating current, the second preset operating current, and the third preset operating current" also includes: If the difference between the actual operating current and the second preset operating current is not greater than the difference between the actual operating current and the third preset operating current, then the current count of the drive pulse is reduced by the preset value.

7. The control method for an air conditioning system according to claim 1, characterized in that, The actual operating parameters include the actual operating current, and the control method further includes: The operating status of the indoor unit fan is controlled based on the actual operating current.

8. The control method for an air conditioning system according to claim 7, characterized in that, "Controlling the operating status of the indoor unit fan based on the actual operating current" includes: If the actual operating current is not greater than the first preset operating current, the indoor unit fan continues to operate; and / or If the actual operating current is greater than the first preset operating current, then the indoor unit fan is turned off.

9. An air conditioning system, comprising a control module, characterized in that, The control module is configured to perform the control method of the air conditioning system as described in any one of claims 1 to 8.

10. The air conditioning system according to claim 9, characterized in that, The air conditioning system also includes an indoor unit fan, which is driven by a sensorless permanent magnet synchronous motor.

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