Control method of air conditioner, air conditioner and computer storage medium

Abstract

The application discloses a control method of an air conditioner, which comprises the following steps: acquiring a current operation parameter of an indoor fan of the air conditioner, wherein the current operation parameter comprises a current wind speed or a wind baffle of the indoor fan; and adjusting a current through a winding of a compressor of the air conditioner according to the current operation parameter, so as to open a heating function of the winding and heat refrigerant in the compressor through the winding. The application further discloses an air conditioner and a computer storage medium. The indoor heating demand is determined according to the wind speed or the wind baffle of the indoor fan, and the current through the winding of the compressor is adjusted correspondingly, so as to adjust the low-temperature heating capacity of the air conditioner correspondingly, thereby avoiding improving the low-temperature heating capacity of the air conditioner by improving the rotating speed of the compressor, and improving the reliability of the air conditioner in low-temperature heating.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and more particularly to air conditioner control methods, air conditioners, and computer storage media. Background Technology

[0002] Low-temperature heating has always been a key technology in air conditioning systems. Technologies such as vapor injection enthalpy-enhancing inverter compressor technology and two-stage compression inverter compressor technology are all designed to solve the problem of low-temperature heating.

[0003] Without using a specially designed compressor, the low-temperature heating capacity of an air conditioner is generally improved by increasing the compressor speed. However, if the compressor speed is too high, it will cause excessive wear on the moving parts of the compressor, reducing the reliability of the air conditioner when heating at low temperatures.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main objective of this invention is to provide a control method for an air conditioner, an air conditioner, and a computer storage medium, aiming to improve the low-temperature heating capacity of the air conditioner while also enhancing its reliability.

[0006] To achieve the above objectives, the present invention provides a control method for an air conditioner, the control method comprising the following steps:

[0007] Obtain the current operating parameters of the indoor fan of the air conditioner, wherein the current operating parameters include the current wind speed or wind speed of the indoor fan;

[0008] Adjust the current through the compressor windings of the air conditioner according to the current operating parameters to activate the heating function of the windings and heat the refrigerant in the compressor through the windings.

[0009] Optionally, the step of adjusting the current through the compressor windings of the air conditioner according to the current operating parameters includes:

[0010] When the current operating parameter is greater than or equal to a first preset threshold, the current through the winding is increased;

[0011] When the current operating parameter is less than or equal to a second preset threshold, the current through the winding is reduced, wherein the second preset threshold is less than the first preset threshold.

[0012] Optionally, the step of adjusting the current through the compressor windings of the air conditioner according to the current operating parameters further includes:

[0013] When the current operating parameter is greater than the second preset threshold and less than the first preset threshold, the change in the operating parameter of the indoor fan is detected in real time.

[0014] When the change in the operating parameters exceeds a preset change, the current through the winding is increased.

[0015] When the change in the operating parameters is less than the preset change, the current through the winding is reduced.

[0016] Optionally, the step of reducing the current through the winding when the current operating parameter is less than or equal to a second preset threshold includes:

[0017] When the current operating parameter is less than or equal to the second preset threshold, it is detected whether the current operating parameter is greater than the third preset threshold, wherein the third preset threshold is less than the second preset threshold;

[0018] When the current operating parameter is greater than the third preset threshold, the current through the winding is reduced.

[0019] Optionally, after the step of adjusting the current through the compressor windings of the air conditioner according to the current operating parameters, the method further includes:

[0020] Obtain the current operating parameters of the indoor fan;

[0021] When the current operating parameter is less than or equal to the third preset threshold, the current through the winding will be restored to the current before adjustment, so as to deactivate the heating function of the winding.

[0022] Optionally, after the step of obtaining the current operating parameters of the indoor fan, the method further includes:

[0023] When the current operating parameter is greater than the third preset threshold, the operating current of the outdoor unit of the air conditioner is obtained;

[0024] When the operating current of the outdoor unit is greater than the first preset current, the current through the winding will be restored to the current before adjustment, so as to deactivate the heating function of the winding.

[0025] When the operating current of the outdoor unit is less than or equal to the first preset current, the process returns to the step of adjusting the current through the compressor windings of the air conditioner according to the current operating parameters.

[0026] Optionally, the step of adjusting the current through the compressor windings of the air conditioner according to the current operating parameters includes:

[0027] Determine the preset parameter range in which the current operating parameters fall;

[0028] Obtain the current adjustment rate corresponding to the preset parameter range;

[0029] The current through the winding is adjusted according to the current adjustment rate.

[0030] Optionally, the control method for the air conditioner further includes:

[0031] Obtain the operating current of the outdoor unit of the air conditioner;

[0032] When the operating current of the outdoor unit is less than the second preset current, the step of obtaining the current operating parameters of the indoor fan of the air conditioner is performed, wherein the second preset current is less than the first preset current.

[0033] In addition, to achieve the above objectives, the present invention also provides an air conditioner, the air conditioner comprising: a memory, a processor, and an air conditioner control program stored in the memory and executable on the processor, wherein when the air conditioner control program is executed by the processor, it implements the steps of the air conditioner control method as described above.

[0034] In addition, to achieve the above objectives, the present invention also provides a computer storage medium storing a control program for an air conditioner, wherein the control program for the air conditioner, when executed by a processor, implements the steps of the control method for the air conditioner as described above.

[0035] The present invention discloses an air conditioner control method, an air conditioner, and a computer storage medium. The method acquires the current operating parameters of the indoor fan, including the current fan speed or fan speed setting. Based on these parameters, the method adjusts the current through the compressor windings to activate the windings' heating function, thereby heating the refrigerant in the compressor. This invention determines indoor heating demand by using the indoor fan speed or fan speed setting and adjusts the current through the compressor windings accordingly to adjust the air conditioner's low-temperature heating capacity. This avoids increasing the compressor speed to improve the air conditioner's low-temperature heating capacity, thus improving the reliability of the air conditioner during low-temperature heating. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the terminal structure of the hardware operating environment involved in the embodiments of the present invention;

[0037] Figure 2 This is a flowchart illustrating an embodiment of the control method for an air conditioner according to the present invention;

[0038] Figure 3 This is a flowchart illustrating another embodiment of the control method for an air conditioner according to the present invention;

[0039] Figure 4 This is a flowchart illustrating another embodiment of the control method for an air conditioner according to the present invention;

[0040] Figure 5 This is a schematic flowchart illustrating an exemplary control method for an air conditioner according to the present invention.

[0041] Figure 6 This is a schematic diagram of the control circuit topology of the compressor of the present invention;

[0042] Figure 7 This is a schematic diagram of the coordinate transformation relationship of the compressor of the present invention;

[0043] Figure 8 This is a vector control block diagram of the compressor of the present invention;

[0044] Figure 9 This is a control diagram of a classic field weakening control module;

[0045] Figure 10 This is a schematic diagram of the field weakening control module of the present invention.

[0046] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0047] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0048] This invention provides a solution that determines the indoor heating demand by adjusting the wind speed or damper of the indoor fan, and accordingly adjusts the current through the compressor winding to adjust the low-temperature heating capacity of the air conditioner. This avoids increasing the compressor speed to improve the low-temperature heating capacity of the air conditioner, thus improving the reliability of the air conditioner during low-temperature heating.

[0049] like Figure 1 As shown, Figure 1 This is a schematic diagram of the terminal structure of the hardware operating environment involved in the embodiments of the present invention.

[0050] In this embodiment of the invention, the terminal is an air conditioner.

[0051] like Figure 1As shown, the terminal may include: a processor 1001, such as a CPU; a communication bus 1002; a user interface 1003; and a memory 1004. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen and an input unit such as a keyboard. Optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The memory 1004 may be high-speed RAM or non-volatile memory, such as a disk drive. Optionally, the memory 1004 may also be a storage device independent of the aforementioned processor 1001.

[0052] Those skilled in the art will understand that Figure 1 The terminal structure shown does not constitute a limitation on the terminal and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0053] like Figure 1 As shown, the memory 1005, which serves as a computer storage medium, may include a user interface module and an air conditioner control program.

[0054] exist Figure 1 In the terminal shown, the user interface 1003 is mainly used to connect to the client (user end) and communicate data with the client; while the processor 1001 can be used to call the air conditioner control program stored in the memory 1004 and perform the following operations:

[0055] Obtain the current operating parameters of the indoor fan of the air conditioner, wherein the current operating parameters include the current wind speed or wind speed of the indoor fan;

[0056] Adjust the current through the compressor windings of the air conditioner according to the current operating parameters to activate the heating function of the windings and heat the refrigerant in the compressor through the windings.

[0057] Furthermore, the processor 1001 can call the air conditioner control program stored in the memory 1004 and also perform the following operations:

[0058] When the current operating parameter is greater than or equal to a first preset threshold, the current through the winding is increased;

[0059] When the current operating parameter is less than or equal to a second preset threshold, the current through the winding is reduced, wherein the second preset threshold is less than the first preset threshold.

[0060] Furthermore, the processor 1001 can call the air conditioner control program stored in the memory 1004 and also perform the following operations:

[0061] When the current operating parameter is greater than the second preset threshold and less than the first preset threshold, the change in the operating parameter of the indoor fan is detected in real time.

[0062] When the change in the operating parameters exceeds a preset change, the current through the winding is increased.

[0063] When the change in the operating parameters is less than the preset change, the current through the winding is reduced.

[0064] Furthermore, the processor 1001 can call the air conditioner control program stored in the memory 1004 and also perform the following operations:

[0065] When the current operating parameter is less than or equal to the second preset threshold, it is detected whether the current operating parameter is greater than the third preset threshold, wherein the third preset threshold is less than the second preset threshold;

[0066] When the current operating parameter is greater than the third preset threshold, the current through the winding is reduced.

[0067] Furthermore, the processor 1001 can call the air conditioner control program stored in the memory 1004 and also perform the following operations:

[0068] Obtain the current operating parameters of the indoor fan;

[0069] When the current operating parameter is less than or equal to the third preset threshold, the current through the winding will be restored to the current before adjustment, so as to deactivate the heating function of the winding.

[0070] Furthermore, the processor 1001 can call the air conditioner control program stored in the memory 1004 and also perform the following operations:

[0071] When the current operating parameter is greater than the third preset threshold, the operating current of the outdoor unit of the air conditioner is obtained;

[0072] When the operating current of the outdoor unit is greater than the first preset current, the current through the winding will be restored to the current before adjustment, so as to deactivate the heating function of the winding.

[0073] When the operating current of the outdoor unit is less than or equal to the first preset current, the process returns to the step of adjusting the current through the compressor windings of the air conditioner according to the current operating parameters.

[0074] Furthermore, the processor 1001 can call the air conditioner control program stored in the memory 1004 and also perform the following operations:

[0075] Determine the preset parameter range in which the current operating parameters fall;

[0076] Obtain the current adjustment rate corresponding to the preset parameter range;

[0077] The current through the winding is adjusted according to the current adjustment rate.

[0078] Furthermore, the processor 1001 can call the air conditioner control program stored in the memory 1004 and also perform the following operations:

[0079] Obtain the operating current of the outdoor unit of the air conditioner;

[0080] When the operating current of the outdoor unit is less than the second preset current, the step of obtaining the current operating parameters of the indoor fan of the air conditioner is performed, wherein the second preset current is less than the first preset current.

[0081] Reference Figure 2 In one embodiment, controlling the air conditioner includes the following steps:

[0082] Step S10: Obtain the current operating parameters of the indoor fan of the air conditioner, wherein the current operating parameters include the current wind speed or wind speed of the indoor fan;

[0083] In this embodiment, the indoor unit of the air conditioner includes an indoor fan. The indoor fan drives airflow to exchange heat with the indoor coil during heat exchange in the indoor unit, so that the indoor unit blows out hot or cold air. When the air conditioner is running in heat exchange mode, the current operating parameters of the indoor fan are acquired. The current operating parameters include the current speed value or the current fan speed of the indoor fan.

[0084] Optionally, the current windshield setting is a percentage, with the maximum windshield setting at 100%. The windshield can also be a gear setting, such as first gear, second gear, etc.

[0085] Optionally, the speed or damper control of the indoor fan is generally related to the indoor heat exchange demand. For example, when there is a large difference between the indoor temperature and the user-set temperature, the indoor fan usually operates at a higher speed or a higher damper to achieve rapid heat exchange. Therefore, the degree of indoor heat exchange demand can be determined based on the speed or damper of the indoor fan.

[0086] Optionally, during air conditioner operation, at least one of the operating current of the outdoor unit, the operating current of the compressor, and the operating current of the entire air conditioner can be obtained. If the operating current of the outdoor unit, the operating current of the compressor, and the operating current of the entire air conditioner are all less than the corresponding current threshold, then the step of obtaining the current operating parameters of the indoor fan is executed. The second preset current is less than the first preset current. For example, if the operating current of the outdoor unit is less than the second preset current, then the step of obtaining the current operating parameters of the indoor fan is executed. If the operating current of the outdoor unit is greater than or equal to the second preset current, then the step of obtaining the current operating parameters of the indoor fan is not executed, so as to avoid the outdoor unit operating current being too high and to avoid the compressor winding heating current being too high and damaging the compressor while meeting the air conditioner's low-temperature heating capacity.

[0087] Step S20: Adjust the current through the compressor winding of the air conditioner according to the current operating parameters to activate the heating function of the winding and heat the refrigerant in the compressor through the winding.

[0088] In this embodiment, after obtaining the current operating parameters of the indoor fan, the system determines how to adjust the current through the compressor windings to activate the winding heating function, and accordingly adjusts the intensity of the heating of the refrigerant in the compressor. For example, when the current fan speed is high, it is assumed that the indoor heat exchange demand is high, so the current through the compressor windings can be increased to enhance the heating of the refrigerant in the compressor. Conversely, when the current fan speed is low, it is assumed that the indoor heat exchange demand is low, so the current through the compressor windings may not be increased, or the current through the compressor windings may be decreased.

[0089] Optionally, the air conditioner's compressor is equipped with an electric motor, which has windings. The windings provide the magnetic field for the motor's rotation. During compressor operation, a fixed current is typically supplied to the windings to generate a fixed magnetic field. Increasing the current through the compressor windings increases the heat generated in the windings, which is then transferred to the refrigerant in the compressor. This increases the refrigerant's heat absorption, thereby improving the air conditioner's heat exchange capacity to match the indoor heat exchange requirements.

[0090] Optionally, multiple preset parameter ranges and preset adjustment rates corresponding to the preset parameter ranges are preset. When adjusting the current through the compressor winding according to the current operating parameters, the preset parameter range in which the current operating parameters are located can be determined, and the preset adjustment rate corresponding to the preset parameter range can be used as the corresponding current adjustment rate. The current through the compressor winding can be adjusted according to the current adjustment rate.

[0091] Optionally, the relationship between the current adjustment rate and the changes in current operating parameters can be determined based on whether it is necessary to increase or decrease the current passing through the windings. For example, when it is necessary to increase the current passing through the compressor windings, the current adjustment rate is positively correlated with the current operating parameters. That is, the larger the current operating parameters, the greater the indoor heat exchange demand. Therefore, a larger current adjustment rate can be obtained to heat the refrigerant in the compressor as quickly as possible, rapidly improving the heat exchange capacity of the air conditioner. Conversely, when it is necessary to decrease the current passing through the compressor windings, the current adjustment rate is negatively correlated with the current operating parameters. That is, the smaller the current operating parameters, the smaller the indoor heat exchange demand. Therefore, a larger current adjustment rate can be obtained to reduce the heating intensity of the refrigerant in the compressor as quickly as possible, reducing the heat exchange capacity of the air conditioner.

[0092] In the technical solution disclosed in this embodiment, the indoor heating demand is determined by the wind speed or wind deflector of the indoor fan, and the current through the compressor winding is adjusted accordingly to adjust the low-temperature heating capacity of the air conditioner. This avoids increasing the compressor speed to improve the low-temperature heating capacity of the air conditioner, thus improving the reliability of the air conditioner during low-temperature heating.

[0093] In another embodiment, such as Figure 3 As shown above, in the above Figure 2 Based on the illustrated embodiment, step S20 includes:

[0094] Step S21: When the current operating parameter is greater than or equal to the first preset threshold, increase the current through the winding;

[0095] Step S22: When the current operating parameter is less than or equal to the second preset threshold, reduce the current through the winding, wherein the second preset threshold is less than the first preset threshold.

[0096] In this embodiment, a first preset threshold and a second preset threshold are preset. These thresholds are used to determine whether the indoor heat exchange demand is too high or too low based on the current operating parameters of the indoor fan, thus determining whether to increase or decrease the current flowing through the windings. The second preset threshold is less than the first preset threshold. For example, if the current operating parameters are greater than or equal to the first preset threshold, the indoor heat exchange demand is considered too high, so the current flowing through the windings can be increased to improve the air conditioner's heat exchange capacity. If the current operating parameters are less than or equal to the second preset threshold, the indoor heat exchange demand is considered too low, so the current flowing through the windings can be decreased to reduce the air conditioner's heat exchange capacity and avoid unnecessary energy consumption.

[0097] Optionally, when the current operating parameters are greater than the second preset threshold and less than the first preset threshold, the indoor heat exchange demand can be considered moderate, and there is no need to adjust the current passing through the winding.

[0098] Optionally, when the current operating parameter is less than or equal to the second preset threshold, it can be further determined whether the current operating parameter is greater than the third preset threshold, wherein the third preset threshold is less than the second preset threshold. If the current operating parameter is greater than the third preset threshold, it indicates that the indoor heat exchange demand is too low. Therefore, the current through the winding can be reduced to decrease the heat exchange capacity of the air conditioner and avoid unnecessary energy consumption. When the current operating parameter is less than or equal to the third preset threshold, it indicates that the indoor heat exchange is too low. There is no need to increase the heat exchange capacity of the indoor unit through heating. Therefore, the current current through the winding can be kept unchanged, that is, the refrigerant in the compressor is not heated through the winding, or the current current through the winding can be restored to the current before adjustment to deactivate the heating function of the winding.

[0099] Optionally, after adjusting the current through the compressor windings of the air conditioner according to the current operating parameters, the heat exchange capacity of the indoor unit will also change. Therefore, the current operating parameters of the indoor fan can be obtained again. When the current operating parameters are less than or equal to the third preset threshold, it is considered that there is no need to heat the refrigerant in the compressor through the windings. Therefore, the current through the windings can be restored to the current before adjustment, and the heating function of the windings can be turned off to avoid unnecessary energy consumption of the air conditioner.

[0100] Optionally, after reacquiring the current operating parameters of the indoor fan, if the current operating parameters are greater than the third preset threshold, at least one of the operating current of the outdoor unit, the operating current of the compressor, and the operating current of the air conditioner can be acquired to detect whether at least one of the operating current of the outdoor unit, the operating current of the compressor, and the operating current of the air conditioner is too high. For example, if the operating current of the outdoor unit is greater than the first preset current, it indicates that the operating current of the outdoor unit is too high. Therefore, the current through the winding can be restored to the current before adjustment, that is, the heating function of the winding is exited. When the operating current of the outdoor unit is less than or equal to the first preset current, the step of adjusting the current through the winding of the air conditioner's compressor according to the current operating parameters is returned.

[0101] In the technical solution disclosed in this embodiment, when the current operating parameter is greater than or equal to the first preset threshold, the current through the winding is increased, and when the current operating parameter is less than or equal to the second preset threshold, the current through the winding is decreased, so as to adjust the heat exchange capacity of the air conditioner to match the indoor heat exchange demand.

[0102] In yet another embodiment, such as Figure 4 As shown, in Figures 2 to 3 Based on any embodiment, step S20 includes:

[0103] Step S23: When the current operating parameter is greater than the second preset threshold and less than the first preset threshold, the change in the operating parameter of the indoor fan is detected in real time.

[0104] In this embodiment, when the current operating parameter is greater than the second preset threshold and less than the first preset threshold, it can be further determined whether the current through the compressor winding needs to be increased or decreased to improve the accuracy of matching the air conditioner's heat exchange capacity with the indoor heat exchange demand. Specifically, the current operating parameters of the indoor fan are detected in real time or periodically, and the change in operating parameters is calculated based on the change in the current operating parameters. The current through the compressor winding is then adjusted more precisely based on the change in operating parameters.

[0105] Optionally, the change in operating parameters is the difference between the current operating parameters of the indoor fan and the previously detected operating parameters.

[0106] Step S24: When the change in the operating parameters is greater than the preset change, increase the current through the winding;

[0107] Step S25: When the change in the operating parameters is less than the preset change, reduce the current passing through the winding.

[0108] In this embodiment, when the change in operating parameters is greater than the preset change, it indicates that the change in indoor heat exchange demand is also large. Therefore, the current through the winding can be increased to meet the indoor heat exchange demand. Conversely, when the change in operating parameters is less than the preset change, it indicates that the change in indoor heat exchange demand is also small. Therefore, the current through the winding can be reduced to meet the indoor heat exchange demand while reducing unnecessary energy consumption of the air conditioner.

[0109] Optionally, when the change in operating parameters equals the preset change, the current through the winding is kept constant.

[0110] In the technical solution disclosed in this embodiment, when the current operating parameter is greater than the second preset threshold and less than the first preset threshold, the change in the operating parameter is used to further determine whether the current through the compressor winding needs to be increased or decreased, so that the heat exchange capacity of the air conditioner is more accurately matched with the indoor heat exchange demand.

[0111] In an exemplary description, such as Figure 5 As shown, in Figures 2 to 4 Based on any of the embodiments shown, the control method of the air conditioner is exemplified as follows:

[0112] Step S1: Record the current A in heating mode.

[0113] Step S2: Determine whether A < A1-1 is true (A1 is preferably 18-25A, here we choose 19A). If true, proceed to step S3. If false, return to step S1.

[0114] Step S3: Turn on the compressor winding heating.

[0115] Step S4: Record the indoor unit fan speed d.

[0116] Step S5: Control the compressor winding heating current according to the following method

[0117] When d ≥ d1, the current is increased at a rate of X1A / s.

[0118] When d ≥ d2, the current increases at a rate of X2A / s.

[0119] When d ≥ d3, the current is increased at a rate of X3A / s.

[0120] When d4 wind speed < d < d3 wind speed, △d = dn - dn-1 (data is collected every 60 seconds).

[0121] When Δd > B, the current increases at a rate of X4A / s.

[0122] When Δd = B, it remains unchanged.

[0123] When Δd < B, reduce the current at a rate of X5A / s.

[0124] When d≤d4, reduce the current at a rate of X6A / s.

[0125] When d≤d5, reduce the current at a rate of X7A / s.

[0126] (Here, d1 to d5 are preferably between 50% and 100%; X1 > X2 > X3 > X4 are preferably between 0.01 and 0.1; X7 > X6 > X5 are preferably between 0.1 and 0.6; and the B value is preferably between 0 and 10%.)

[0127] Step S6: Determine whether d≤d6 is true (d6<d5, preferably 30%~50%). If true, proceed to step S8; otherwise, return to step S7.

[0128] Step S7: Determine whether A≥A1 is true. If true, proceed to step S8; otherwise, proceed to step S5.

[0129] Step S8: Disconnect compressor winding heating

[0130] Where d is the real-time fan speed of the indoor unit, d1 to d6 are the preset thresholds of the indoor unit fan speed, Δd is the real-time change of the indoor unit fan speed, dn and dn-1 are the fan speeds collected every 60 seconds when d4 < d < d3, b is the preset threshold of the real-time change of the indoor unit fan speed, A is the current, A1 is the preset threshold of the current, X1 to X7 are the preset thresholds of the current rate, and A / S is the unit of current rate.

[0131] In this exemplary description, the heating capacity at low temperatures is improved by heating the compressor windings and transferring the heat to the indoor unit evaporator through the refrigerant via the windings. This example can be applied not only to conventional compressors but also to inverter compressors specially designed for low-temperature heating (such as vapor injection enthalpy-increasing compressors) to further enhance heating capacity. This example provides a method to control the heating current of this technology by changing the indoor unit fan speed, which can more effectively utilize the technology and improve its reliability.

[0132] Reference Figures 6-10 The control technology of the air conditioner compressor and the winding heating function are explained, with examples as follows:

[0133] like Figure 6 As shown, the control circuit topology of the variable frequency compressor includes a control chip, a three-phase bridge drive circuit composed of power switching transistors, and the variable frequency compressor. The drive circuit can consist of six IGBTs, six MOSFETs, or an intelligent power module (IPM), and also includes anti-parallel diodes. The control chip outputs a compressor drive signal, which controls the operation of the variable frequency compressor through the drive circuit. Current sensors (three, two, or one) detect the compressor phase current. The variable frequency compressor is driven by an embedded permanent magnet synchronous motor.

[0134] Figure 7 This is a coordinate relationship diagram for vector control of a variable frequency compressor. Figure 8 This is a block diagram of sensorless vector control for a variable frequency compressor. In vector control, the given speed... Compared with the estimated speed The output torque T is given by the proportional-integral (PI) controller. e * According to the torque given T e * With torque current coefficient K t and the weak magnetic current i fwc The quadrature axis current (q-axis current) is calculated using Maximum Torque Current Control (MTPA). and direct-axis current (d-axis current) given Based on the d-axis current setpoint, q-axis current setpoint, and feedback current i d / i q The output voltage u is obtained through vector control.d / u q Then, the control output voltage u is obtained through PARK inverse transformation. α / u β The signal is then processed by Space Vector Modulation (SVM) to output a PWM waveform, which drives the variable frequency compressor via the power module. The compressor's three-phase current is detected by a current sensor and converted using Clarke transform to obtain the feedback current i. α / i β The feedback current i is then obtained through PARK transformation. d / i q According to the output voltage u α / u β and feedback current i α / i β And the parameters of the compressor's internal motor (motor resistance R) s Direct-axis inductor L d and cross-axis inductance L q The estimated rotational speed can be obtained through a sensorless estimation algorithm. and estimating electrical angle

[0135] Classical field weakening control methods, such as Figure 9 As shown, based on the output voltage u in the rotating coordinate system d / u q Or the output voltage u in a stationary coordinate system α / u β Calculate the output voltage amplitude u s ,for

[0136]

[0137] Set the voltage limiting threshold u according to the maximum voltage amplitude that the driver can output. max When using a space vector pulse width modulation algorithm and the driver operates only within the linear modulation region without overmodulation, the maximum output voltage amplitude is equal to the DC bus voltage u. dc 0.577 times, then, u max =0.577u dc ,in,

[0138] Voltage limiting threshold u max Subtract the output voltage amplitude u s The magnetic field weakening voltage difference Δu is obtained, i.e., Δu = u max -u s The magnetic weakening voltage difference Δu is proportional-integral controlled, and the resulting output is then limited to obtain the magnetic weakening current i. fwcThe upper limit of the limiting circuit is zero, and the lower limit is the minimum d-axis current i. d_min .

[0139] like Figure 10 As shown, the compressor winding heating function proposed in this invention is based on the exhaust temperature T. p The heating current i is obtained through control. heat , heating current i heat With the field weakening control current i dpre The magnetic field weakening current i is obtained by summing the components and then passing them through a limiting circuit. fwc The upper limit of the limiting circuit is zero, and the lower limit is the minimum d-axis current i. d_min It is understandable that the winding heating function can be activated when the current through the winding is increased and the compressor is controlled in the manner described above. The winding heating function can be deactivated when the current through the winding is restored to the current before the increase and the compressor is controlled in the manner described above.

[0140] Furthermore, this invention also proposes an air conditioner, which includes: a memory, a processor, and a control program for the air conditioner stored in the memory and executable on the processor. When the control program for the air conditioner is executed by the processor, it implements the steps of the control method for the air conditioner as described in the above embodiments.

[0141] Furthermore, this embodiment of the invention also proposes a computer storage medium storing a control program for an air conditioner. When the control program for the air conditioner is executed by a processor, it implements the steps of the control method for the air conditioner as described in the above embodiments.

[0142] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0143] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0144] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0145] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A control method of an air conditioner, characterized by, The control method of the air conditioner comprises the following steps: obtaining a current operating parameter of an indoor fan of the air conditioner, wherein the current operating parameter comprises a current wind speed or a current wind block of the indoor fan; adjusting a current passing through a winding of a compressor of the air conditioner according to the current operating parameter to turn on a heating function of the winding, and heating refrigerant in the compressor by the winding; wherein the step of adjusting the current passing through the winding of the compressor of the air conditioner according to the current operating parameter comprises: determining a preset parameter interval in which the current operating parameter is located; obtaining a current adjustment rate corresponding to the preset parameter interval; adjusting the current passing through the winding according to the current adjustment rate; wherein the step of adjusting the current passing through the winding according to the current adjustment rate comprises: when the current operating parameter is greater than or equal to a first preset threshold, increasing the current passing through the winding according to the current adjustment rate; when the current operating parameter is less than or equal to a second preset threshold, decreasing the current passing through the winding according to the current adjustment rate, wherein the second preset threshold is less than the first preset threshold; wherein the step of decreasing the current passing through the winding according to the current adjustment rate when the current operating parameter is less than or equal to the second preset threshold comprises: when the current operating parameter is less than or equal to the second preset threshold, detecting whether the current operating parameter is greater than a third preset threshold, wherein the third preset threshold is less than the second preset threshold; when the current operating parameter is greater than the third preset threshold, decreasing the current passing through the winding according to the current adjustment rate; wherein the current adjustment rate is positively correlated with the current operating parameter when the current passing through the winding is increased; the current adjustment rate is negatively correlated with the current operating parameter when the current passing through the winding is decreased.

2. The control method of the air conditioner according to claim 1, wherein The step of adjusting the current passing through the winding of the compressor of the air conditioner according to the current operating parameter further comprises: when the current operating parameter is greater than the second preset threshold and less than the first preset threshold, detecting a change amount of the operating parameter of the indoor fan in real time; when the change amount of the operating parameter is greater than a preset change amount, increasing the current passing through the winding; when the change amount of the operating parameter is less than the preset change amount, decreasing the current passing through the winding.

3. The control method of the air conditioner according to claim 1, wherein After the step of adjusting the current passing through the winding of the compressor of the air conditioner according to the current operating parameter, the method further comprises: obtaining a current operating parameter of the indoor fan; when the current operating parameter is less than or equal to the third preset threshold, restoring the current passing through the winding to a current before adjustment to exit the heating function of the winding.

4. The control method of claim 3, wherein, After the step of obtaining the current operating parameter of the indoor fan, the method further comprises: when the current operating parameter is greater than the third preset threshold, obtaining an operating current of an outdoor unit of the air conditioner; when the operating current of the outdoor unit is greater than a first preset current, restoring the current passing through the winding to the current before adjustment to exit the heating function of the winding. When the operating current of the outdoor unit is less than or equal to the first preset current, the step of adjusting the current through the winding of the compressor of the air conditioner according to the current operating parameter is performed again.

5. The control method of the air conditioner according to claim 1, wherein The control method of the air conditioner further comprises: obtaining an operating current of an outdoor unit of the air conditioner; When the operating current of the outdoor unit is less than a second preset current, the step of obtaining the current operating parameter of the indoor fan of the air conditioner is performed, wherein the second preset current is less than the first preset current.

6. An air conditioner characterized by comprising: The air conditioner comprises a memory, a processor, and a control program of the air conditioner stored in the memory and executable on the processor, and the control program of the air conditioner, when executed by the processor, implements the steps of the control method of the air conditioner according to any one of claims 1 to 5.

7. A computer storage medium, characterized in that The computer storage medium stores the control program of the air conditioner, and the control program of the air conditioner, when executed by the processor, implements the steps of the control method of the air conditioner according to any one of claims 1 to 5.

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