Air conditioning system and control method thereof

Abstract

The embodiment of the application discloses an air conditioning system and a control method thereof, relates to the technical field of air conditioners, and aims to solve the problem of overloading operation of a direct-current motor under a serious frosting state of a heat exchanger, thereby causing large noise and high energy consumption of the air conditioning system. The air conditioning system comprises the heat exchanger, the direct-current motor and a controller. The controller is configured to acquire a frosting state of the heat exchanger and an operation state of the direct-current motor, and adjust a control voltage of the direct-current motor to a voltage threshold value when the heat exchanger is in the serious frosting state and the direct-current motor is in a target operation state. In the target operation state, the rotational speed of the direct-current motor is less than a rotational speed threshold value and the control voltage is greater than the voltage threshold value.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, and particularly relates to an air conditioning system and a control method thereof. BACKGROUND

[0002] The direct current motor is an important component of the air conditioning system, and is mainly responsible for providing a wind field for the air conditioning system to perform heat exchange. In the current mainstream direct current motor scheme of the air conditioning system, the control unit of the direct current motor is built in the motor, and the host of the air conditioning system changes the speed of the direct current motor by adjusting the high and low of the voltage sag protector (VSP) at the speed control port, so as to change the size of the air volume.

[0003] However, the control method of the direct current motor has the following disadvantages: the direct current motor is a simple speed closed-loop control, and the current cannot be detected, so the running state of the motor cannot be known, and only the actual speed is detected. When the heat exchanger of the air conditioning system is in a serious frosting state, if the actual speed does not reach the required speed, the VSP will be increased until the maximum. At this time, the direct current motor may be overloaded, the noise is large, the power consumption is large, and the user experience is affected. SUMMARY

[0004] The present application provides an air conditioning system and a control method thereof, which are used to solve the problem that the direct current motor may be overloaded in the serious frosting state of the heat exchanger, thereby causing the air conditioning system to have large noise and high energy consumption.

[0005] In order to achieve the above purpose, the technical scheme is adopted as follows.

[0006] In a first aspect, an air conditioning system is provided, comprising: a heat exchanger; a direct current motor; and a controller configured to: obtain a frosting state of the heat exchanger and a running state of the direct current motor; and in a case where the heat exchanger is in a serious frosting state and the direct current motor is in a target running state, adjust a control voltage of the direct current motor to a voltage threshold value; wherein in the target running state, the speed of the direct current motor is less than a speed threshold value and the control voltage is greater than the voltage threshold value.

[0007] The technical scheme provided by the embodiments of the present application at least brings the following beneficial effects: the scheme adds the judgment of the frosting state of the heat exchanger, and combines the change of the running state of the direct current motor. When the direct current motor is about to enter the overload running state, the VSP threshold value is constantly corrected, and the control voltage is actively controlled not to increase any more, so as to avoid the direct current motor entering the overload running state. Therefore, the power consumption and energy loss are reduced, the noise influence is reduced, and the comfort of the user is improved.

[0008] In some embodiments, the control voltage of the DC motor remains unchanged for a preset period of time, the preset period of time being a period of time after the control voltage of the DC motor is adjusted to the voltage threshold.

[0009] In some embodiments, the air conditioning system further comprises: a first temperature sensor configured to detect an ambient temperature; and a second temperature sensor configured to detect a heat exchanger temperature; and the controller is specifically configured to: acquire the ambient temperature via the first temperature sensor and acquire the heat exchanger temperature via the second temperature sensor when the frosting state of the heat exchanger is acquired; and determine that the heat exchanger is in the serious frosting state if the ambient temperature and the heat exchanger temperature satisfy a preset temperature condition.

[0010] In some embodiments, the controller is further configured to: acquire an actual rotating speed of the DC motor and a required rotating speed of the DC motor when the heat exchanger is not in the serious frosting state; and increase the control voltage of the DC motor if a difference between the actual rotating speed of the DC motor and the required rotating speed of the DC motor is greater than a difference threshold.

[0011] In some embodiments, the controller is further configured to: acquire an actual rotating speed of the DC motor and a required rotating speed of the DC motor; and increase the voltage threshold if the control voltage is greater than the voltage threshold and the actual rotating speed is greater than a rotating speed threshold.

[0012] In the second aspect, the embodiments of the present application provide a control method of an air conditioning system, comprising: acquiring a frosting state of a heat exchanger and an operating state of a DC motor; and adjusting a control voltage of the DC motor to a voltage threshold when the heat exchanger is in a serious frosting state and the DC motor is in a target operating state; wherein, in the target operating state, a rotating speed of the DC motor is less than a rotating speed threshold and the control voltage is greater than the voltage threshold.

[0013] In the third aspect, the embodiments of the present application provide a controller, comprising: one or more processors; and one or more memories; wherein the one or more memories are configured to store computer program codes, the computer program codes comprising computer instructions, and when the one or more processors execute the computer instructions, the controller executes any one of the control methods of the air conditioning system provided in the second aspect.

[0014] In the fourth aspect, the embodiments of the present application provide a computer readable storage medium, the computer readable storage medium comprising computer instructions, and when the computer instructions are executed on a computer, the computer instructions cause the computer to execute the method provided in the second aspect and possible implementation manners.

[0015] In the fifth aspect, the embodiments of the present application provide a computer program product, the computer program product being directly loadable into a memory and containing software codes, and the computer program product, when loaded and executed by a computer, can implement the method provided in the second aspect and possible implementation manners.

[0016] It should be noted that the above computer instructions can be stored in whole or in part on a computer readable storage medium. The computer readable storage medium can be packaged together with the processor of the controller or packaged separately from the processor of the controller, and the present application does not limit this.

[0017] The beneficial effects of the second aspect to the fifth aspect described in the present application can be analyzed with reference to the beneficial effects of the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical solutions of the present application, and do not constitute a limitation on the technical solutions of the present application.

[0019] Figure 1 A schematic diagram of the composition of an air conditioning system is provided for the embodiments of the present application;

[0020] Figure 2 A schematic diagram of the circuit structure of an air conditioning system is provided for the embodiments of the present application;

[0021] Figure 3 A hardware configuration block diagram of an air conditioning system is provided for the embodiments of the present application;

[0022] Figure 4 A control method flow chart of an air conditioning system is provided for the embodiments of the present application;

[0023] Figure 5 A judgment method flow chart of the frosting state of a heat exchanger is provided for the embodiments of the present application;

[0024] Figure 6 A relationship broken line diagram between the frosting degree value of a heat exchanger and the VSP value adjustment is provided for the embodiments of the present application;

[0025] Figure 7 A control method flow chart of another air conditioning system is provided for the embodiments of the present application;

[0026] Figure 8 A hardware structure schematic diagram of a controller is provided for the embodiments of the present application. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] It should be noted that all the direction indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the direction indications will also change accordingly.

[0029] The terms "first", "second", "third", etc. are only used for descriptive purpose and should not be construed as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0030] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, when describing the pipeline, the "connected" and "linked" in the present application have the meaning of conducting. The specific meaning should be understood in combination with the context.

[0031] In the embodiments of the present application, the words such as "exemplary" or "for example" are used to represent as an example, illustration or description. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. In fact, the words such as "exemplary" or "for example" are intended to present the relevant concept in a specific manner.

[0032] In order to facilitate understanding, first, some terms or basic concepts of technology related to the embodiments of the present application are simply introduced and described.

[0033] Voltage sag protector (VSP): This port is the speed control port of the DC motor. The speed of the DC motor can be adjusted by DC 0-5V.

[0034] Refrigerant saturation temperature: also known as condensation temperature. It refers to the temperature at which the refrigerant in the condenser condenses from gas to liquid under a certain pressure. There is also a certain correspondence between the condensation temperature and the condensation pressure. Therefore, the adjustment of the condensation temperature can also be achieved by adjusting the condensation pressure.

[0035] As described above, the existing air conditioning system cannot maintain silence and low energy consumption under the conditions of serious frosting of the heat exchanger and overload operation of the DC motor, resulting in relatively low efficiency and low user comfort of the air conditioning system.

[0036] Based on this, this application provides an air conditioning system, including: a heat exchanger; a DC motor; and a controller configured to: acquire the frosting state of the heat exchanger and the operating state of the DC motor; and, when the heat exchanger is in a severely frosted state and the DC motor is in a target operating state, adjust the control voltage of the DC motor to a voltage threshold; wherein, in the target operating state, the speed of the DC motor is less than the speed threshold and the control voltage is greater than the voltage threshold. This achieves quiet operation and low energy consumption of the air conditioning system under conditions of severe heat exchanger frosting and DC motor overload operation, improving the efficiency ratio of the air conditioning system and user comfort.

[0037] The embodiments provided in this application will now be described in detail with reference to the accompanying drawings.

[0038] Figure 1 This is a schematic diagram of the composition of an air conditioning system provided in an embodiment of this application, such as... Figure 1 As shown, the air conditioning system 100 includes an outdoor unit 10, an indoor unit 11, and a controller 1000. Figure 1 (Not shown in the image). The indoor unit 11 includes at least one indoor unit, and each indoor unit is connected to the outdoor unit via refrigerant connection pipes.

[0039] Figure 1 The previous example only involved one outdoor unit connected to two indoor units. This application provides a multi-split air conditioning system where one outdoor unit connects to multiple indoor units. Figure 1 The composition of the multi-split air conditioning system does not constitute a limitation on this multi-split air conditioning system.

[0040] Outdoor unit 10 is typically installed outdoors for heat exchange within the indoor environment. Additionally, in Figure 1 In the illustration, outdoor unit 10 is shown as a dashed line because it is located outdoors on the opposite side of indoor unit 11, separated by a wall.

[0041] Indoor unit 11, taking a wall-mounted unit as an example, is typically installed on an indoor wall surface. Another example is a floor-standing unit (…). Figure 1 (Not shown in the image) is also a type of indoor unit. This air conditioning system may include an outdoor unit and at least one indoor cabinet unit.

[0042] In the embodiments shown in the present application, the controller 1000 refers to a device that can generate operation control signals according to instruction operation codes and timing signals to instruct the air conditioning system 100 to execute control instructions. Exemplarily, the controller 1000 can be a central processing unit (CPU), a general-purpose processor network processor (NP), a digital signal processing (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The controller 1000 can also be other devices with processing functions, such as a circuit, a device, or a software module, and the embodiments of the present application do not make any limitation in this regard.

[0043] In addition, the controller 1000 can be used to control various components inside the air conditioning system 100 to enable the components to operate to achieve various predetermined functions of the air conditioning system 100.

[0044] Figure 2 The circuit structure schematic diagram of the air conditioning system 100 provided by the embodiments of the present application is shown in FIG. 1. As shown in the figure, the air conditioning system 100 further includes a refrigerant circuit 12, a compressor 13, a four-way valve 14, an outdoor heat exchanger 15, an expansion valve 16, a liquid accumulator 17, and an indoor heat exchanger 18. Figure 2

[0045] In some embodiments, the indoor heat exchanger 18 and the outdoor heat exchanger 15 work as a condenser or an evaporator.

[0046] In some embodiments, the compressor 13 sucks in refrigerant from a suction port and discharges the refrigerant compressed inside from a discharge port to the indoor heat exchanger 18. The compressor 13 is an inverter compressor with variable capacity based on inverter speed control.

[0047] In some embodiments, the four-way valve 14 switches when the air conditioning system 100 operates in a heating mode or a cooling mode.

[0048] In some embodiments, the outdoor heat exchanger 15 has a first port for passing refrigerant between the suction port of the compressor 13 and the liquid accumulator 17, and has a second port for passing refrigerant between the expansion valve 16. The outdoor heat exchanger 15 exchanges heat between the refrigerant flowing in a heat transfer pipe (not shown) connected between the second port and the first port of the outdoor heat exchanger 15 and outdoor air. Figure 2

[0049] ​​In some embodiments, an expansion valve 16 is disposed between an outdoor heat exchanger 15 and an indoor heat exchanger 18. The expansion valve 16 has the function of expanding and depressurizing the refrigerant flowing between the outdoor heat exchanger 15 and the indoor heat exchanger 18.

[0050] Furthermore, the expansion valve 16 is configured to change its opening degree. By decreasing the opening degree, the flow resistance of the refrigerant passing through the expansion valve 16 increases; by increasing the opening degree, the flow resistance of the refrigerant passing through the expansion valve 16 decreases. During heating operation, this expansion valve 16 causes the refrigerant flowing from the indoor heat exchanger 18 towards the outdoor heat exchanger 15 to expand and depressurize. Moreover, even if the states of other components installed in the refrigerant circuit 12 remain unchanged, the flow rate of the refrigerant flowing in the refrigerant circuit 12 will change when the opening degree of the expansion valve 16 changes.

[0051] In some embodiments, the indoor heat exchanger 18 has a second inlet for allowing liquid refrigerant to flow between it and an expansion valve 16, and a first inlet for allowing gaseous refrigerant to flow between it and the outlet of the compressor 13. The indoor heat exchanger 18 enables heat exchange between refrigerant flowing in a heat transfer tube connected between the second inlet and the first inlet of the indoor heat exchanger 18 and indoor air.

[0052] In some embodiments, a receiver 17 is disposed between the outdoor heat exchanger 15 and the suction inlet of the compressor 13. In the receiver 17, the refrigerant flowing from the outdoor heat exchanger 15 to the compressor 13 is separated into gaseous refrigerant and liquid refrigerant. Furthermore, gaseous refrigerant is primarily supplied from the receiver 17 to the suction inlet of the compressor 13.

[0053] In some embodiments, the air conditioning system 100 further includes a first temperature sensor ( Figure 2 (Not shown in the image), installed within the air conditioning system 100, is used to detect ambient temperature.

[0054] In some embodiments, the air conditioning system 100 further includes a second temperature sensor ( Figure 2 (Not shown in the image), installed on the heat exchanger, used to detect the heat exchanger temperature.

[0055] Figure 3 This is a hardware configuration block diagram of an air conditioning system 100 provided in an embodiment of this application. (See diagram below.) Figure 3 As shown, the air conditioning system 100 may also include the following two items: a memory 1002 and a communication interface 1003.

[0056] In some embodiments, the memory 1002 can be used to store software programs and data. The controller 1000 performs various functions of the air conditioning system 100 and data processing by running the software programs or data stored in the memory 1002. The memory 1002 can include a high-speed random access memory, and can also include a non-volatile memory such as at least one disk storage device, a flash memory device, or other volatile solid-state memory device. The memory 1002 stores an operating system that enables the air conditioning system 100 to operate. In this application, the memory 1002 can store the operating system and various application programs, and can also store the code for performing the control method of the air conditioning system 100 provided by the embodiments of the present application.

[0057] In some embodiments, the communication interface 1003 is used to establish a communication connection with other network entities, for example, to establish a communication connection with a terminal device. The communication interface 1003 can include a radio frequency (RF) module, a cellular module, a wireless fidelity (WIFI) module, and a GPS module, etc. Taking the RF module as an example, the RF module can be used for receiving and transmitting signals, in particular, transmitting the received information to the controller 1000 for processing; in addition, transmitting the signals generated by the controller 1000. Generally, the RF circuit can include but is not limited to an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier (LNA), a duplexer, etc.

[0058] Those skilled in the art can understand that the hardware structure shown in the above Figure 3 The hardware structure shown in the above does not constitute a limitation on the air conditioning system 100, and the air conditioning system 100 can include more or fewer components than those shown, or combine certain components, or different component arrangements.

[0059] Figure 4 A flowchart of a control method of an air conditioning system provided by the embodiments of the present application is applied to the controller 1000 in the above air conditioning system 100, as shown in Figure 4 The method comprises:

[0060] S101, the controller acquires the frosting state of the heat exchanger and the operating state of the DC motor.

[0061] When the outdoor temperature is lower than 0℃, and the temperature of the heat exchanger is lower than the dew point temperature of the ambient air, the surface of the heat dissipation fin of the heat exchanger will produce condensation water. If the ambient temperature at this time is also lower than 0℃, the condensation water will condense into frost, so that the heat exchanger enters the frosting state.

[0062] Optionally, the frosting state of the heat exchanger includes a mild frosting state and a severe frosting state.

[0063] It should be noted that when the heat exchanger is in a light frosting state, the frosting has a lower impact on the heat exchange capacity of the heat exchanger. In addition, when the heat exchanger is in a serious frosting state, the fins of the heat exchanger can be blocked, which can cause the heat exchange air volume to decrease.

[0064] Optionally, the operating state of the DC motor includes a normal operating state and an overload operating state.

[0065] It should be noted that when the DC motor is in the overload operating state, the rotating speed of the DC motor can exceed the normal operating speed range, thereby causing the air conditioning system to consume a large amount of energy and generate a large amount of noise.

[0066] In some embodiments, the frosting state of the heat exchanger can be obtained by the method shown in Figure 5 As shown in the method shown in Figure 5 , the method comprises the following steps.

[0067] S1011, the controller obtains an environment temperature and a heat exchanger temperature.

[0068] Optionally, the controller can obtain the environment temperature by a first temperature sensor and obtain the heat exchanger temperature by a second temperature sensor.

[0069] S1012, if the environment temperature and the heat exchanger temperature satisfy a preset temperature condition, the controller determines that the heat exchanger is in a serious frosting state.

[0070] Optionally, the preset temperature condition can include: the environment temperature minimum value Ta min is greater than or equal to 6℃, that is, Ta min ≥6℃, and the heat exchanger minimum temperature Te min is less than or equal to -2℃, that is, Te min ≤-2℃.

[0071] Optionally, the preset temperature condition can also include: the environment temperature minimum value Ta min is greater than -5℃ and less than 6℃, that is, 6℃>Ta min >-5℃, and the heat exchanger minimum temperature Te min is less than or equal to a first temperature value.

[0072] The calculation method of the first temperature value is shown in formula (1):

[0073] First temperature value=(11×Ta min -107) / 16 formula (1)

[0074] For example, when Ta min =1℃, the first temperature value=(11×1-107) / 16=-6, that is, the first temperature value is -6℃.

[0075] Optionally, the preset temperature condition can also include: the ambient temperature minimum value Ta min less than or equal to -5℃, i.e. Ta min ≤-5℃, and the heat exchanger minimum temperature Te min less than or equal to a second temperature value. The calculation method of the second temperature value is shown in formula (2):

[0076] Second temperature value = (18 × Ta min -70) / 16 formula (2)

[0077] For example, when Ta min =-6℃, the second temperature value = (18 × (-6℃) -70) / 16 = -11.125, i.e. the second temperature value is -11.125℃.

[0078] In some embodiments, when the running time of the air conditioning system meets the preset time condition, the controller determines that the heat exchanger is in a serious frosting state according to the ambient temperature and the heat exchanger temperature meeting the preset temperature condition.

[0079] For example, the preset time condition includes: the cumulative time of the air conditioning system running in the heating mode is greater than or equal to a preset time, and the time of the air conditioning system continuously running in the heating mode is greater than or equal to ten minutes.

[0080] It should be noted that this preset time is pre-stored in the memory by the air conditioning manufacturer, and the preset time of different manufacturers can be changed, which is not limited in the present application.

[0081] Based on the above-mentioned time condition, the preset temperature condition for determining that the heat exchanger is in a serious frosting state can be: after the frequency conversion function of the air conditioning system is started, the compressor discharge temperature minimum value Td min is greater than the refrigerant saturation temperature Tc+10℃, i.e. Td min >Tc+10℃, and the ambient temperature minimum value Ta min is less than or equal to -5℃, i.e. Ta min ≤-5℃, and the heat exchanger minimum temperature Te min is less than or equal to a first temperature value.

[0082] The compressor discharge temperature is detected and obtained by a temperature sensor arranged on the compressor.

[0083] Optionally, the refrigerant saturation temperature Tc can be confirmed according to a preset corresponding relationship between the refrigerant saturation temperature Tc and the condensing pressure P. The condensing pressure is detected and obtained by a pressure sensor of the air conditioning system. The preset corresponding relationship is used to indicate the corresponding relationship between at least one refrigerant saturation temperature Tc and at least one condensing pressure P.

[0084] For example, the preset corresponding relationship can be implemented in the form of a corresponding relationship table. Table 1 shows a corresponding relationship table. As shown in Table 1, the preset corresponding relationship can include a plurality of refrigerant saturation temperatures Tc and a plurality of condensing pressures P. Moreover, the plurality of refrigerant saturation temperatures Tc and the plurality of condensing pressures P have a one-to-one corresponding relationship.

[0085] Table 1

[0086]

[0087]

[0088] For example, when the condensing pressure P = 0.03 MPa, the refrigerant saturation temperature Tc = -46°C. When P = 0.09 MPa, Tc = -38°C. When P = 0.20 MPa, Tc = -27°C.

[0089] It should be noted that the above corresponding relationship table between the refrigerant saturation temperature Tc and the condensing pressure P does not list all the corresponding relationships, and this part is not a distinguishing technical feature of the technical solution, so it will not be listed one by one.

[0090] The calculation method of the first temperature value is shown in formula (3):

[0091] First temperature value = (15 × Ta min -480) / 26 formula (3)

[0092] For example, when Ta min is -5°C, the first temperature value is (15 × (-5°C) - 480) / 26 ≈ -21°C, that is, the first temperature value is about -21°C.

[0093] It should be noted that the determination condition of whether the heat exchanger is in a serious frosting state according to the operation time of the air conditioning system, the compressor discharge temperature, and the refrigerant saturation temperature includes but is not limited to the above conditions. The determination condition can also be other possible conditions, and the present application does not limit this.

[0094] In some embodiments, when the rotational speed of the DC motor is less than the rotational speed threshold, but the control voltage of the DC motor is greater than the voltage threshold, it indicates that the current DC motor is in an overload operation state.

[0095] In some embodiments, the controller can also determine the frosting state of the heat exchanger based on the degree of blockage of the heat exchanger.

[0096] Exemplarily, after the heat exchanger enters the frosting state, the frosting degree of the heat exchanger can be determined according to the preset corresponding relationship between the frosting degree of the heat exchanger and the blocking degree of the heat exchanger.

[0097] Exemplarily, the preset corresponding relationship can be implemented in the form of a corresponding relationship table. Table 2 shows a corresponding relationship table. As shown in Table 2, the preset corresponding relationship can include a plurality of heat exchanger blocking degrees and a plurality of heat exchanger frosting degrees. And the plurality of heat exchanger blocking degrees and the plurality of heat exchanger frosting degrees have a one-to-one correspondence.

[0098] Table 2

[0099] Heat exchanger clogging degree (%) Heat exchanger frosting degree % a A b B c C d D

[0100] Exemplarily, when the heat exchanger blocking degree is a%, the heat exchanger frosting degree is A%; when the heat exchanger blocking degree is b%, the heat exchanger frosting degree is B%; when the heat exchanger blocking degree is c%, the heat exchanger frosting degree is C%; and when the heat exchanger blocking degree is d%, the heat exchanger frosting degree is D%.

[0101] Optionally, the frosting threshold can be 98%, 99%, or other possible thresholds. The frosting threshold is pre-stored in the memory by the air conditioner manufacturer, and the threshold set by different manufacturers can be changed, which is not limited in the present application.

[0102] Exemplarily, when the frosting degree value of the heat exchanger is greater than or equal to 98%, the controller determines that the heat exchanger is in a serious frosting state.

[0103] In some embodiments, the frosting state of the heat exchanger can be determined according to the above-mentioned environmental temperature and heat exchanger temperature, or according to the heat exchanger blocking degree, or in combination with the environmental temperature, heat exchanger temperature and heat exchanger blocking degree. The present application is not limited in this regard.

[0104] S102, in the case that the heat exchanger is in a serious frosting state and the direct current motor is in a target operating state, the controller adjusts the control voltage of the direct current motor to a voltage threshold.

[0105] In the target operating state, the rotational speed of the direct current motor is less than a rotational speed threshold and the control voltage is greater than the voltage threshold.

[0106] It should be noted that when the rotational speed of the direct current motor is less than the rotational speed threshold, the rotational speed of the direct current motor is in a downward trend, but if the control voltage at this time is greater than the voltage threshold, it indicates that the direct current motor will enter an overload operating state.

[0107] In summary, the target operating state of a DC motor is the operating state when the DC motor is about to enter an overload operating state.

[0108] For example, when the heat exchanger is in a state of severe frosting and the DC motor is about to enter an overload operation state, the controller will stop increasing the control voltage, adjust the current control voltage to the voltage threshold, and keep the current control voltage unchanged.

[0109] The technical solution provided in this application provides at least the following beneficial effects: By adding a judgment on the frosting state of the heat exchanger and combining it with the changes in the operating state of the DC motor, the VSP threshold is continuously adjusted when the DC motor is about to enter an overload operating state, and the control voltage is actively controlled to prevent it from increasing, thus avoiding the DC motor from entering an overload operating state. This reduces power consumption and energy loss, lowers noise levels, improves user comfort, and ensures the heat exchanger's heat exchange capacity in the early stages of frosting without increasing hardware resources.

[0110] In some embodiments, when the heat exchanger is not in a state of severe frosting, the actual speed and the required speed of the DC motor are obtained, and the control voltage of the DC motor is adjusted according to the difference between the actual speed and the required speed.

[0111] Optionally, if the actual speed N0 of the DC motor n and required rotational speed N count The difference Δ between N Greater than the difference threshold N d The controller increases the control voltage VSP of the DC motor.

[0112] For example, when Δ N >N d The controller increases the VSP.

[0113] Optionally, when the control voltage VSP is greater than the voltage threshold VSP n And the actual speed N0 of the DC motor n When the speed exceeds the speed threshold N, the controller increases the control voltage VSP of the DC motor.

[0114] For example, when VSP > VSP n And N0 n When the value is greater than N, the controller increases VSP.

[0115] In some embodiments, the relationship between the heat exchanger frosting level and the VSP adjustment can be achieved through... Figure 6 The line graph shown represents this. For example... Figure 6 As shown.

[0116] For example, when the heat exchanger is in a lightly frosted state, the controller controls the VSP to increase; when the heat exchanger is in a severely frosted state, the controller controls the control voltage to stop increasing, adjusts the current control voltage to the voltage threshold, and keeps the current control voltage unchanged.

[0117] In some embodiments, the above-described VSP adjustment method can also be achieved through methods such as... Figure 7 The method shown is implemented as follows. Figure 7 As shown, the method includes the following steps:

[0118] S1, The controller obtains the actual speed N0 of the DC motor. n and required rotational speed N count Determine the actual rotational speed N0 n and required rotational speed N count The difference Δ between N The relationship with the difference threshold, if Δ N >

[0119] N d Then the controller will execute the following step S2; if Δ N ≤N d Then the controller will execute S1 again.

[0120] S2. The controller increases the control voltage VSP. It then compares VSP with the voltage threshold VSP. n The relationship between VSP and VSP. If VSP ≤ VSP n Then the controller executes S1 as described above; if VSP > VSP n Then determine the actual rotational speed N0. n The relationship between N and the speed threshold N. If N0 n If N ≥ N, then the controller will execute step S3 below; if N ≥ N, then the controller will execute step S3 below. n <N, the controller controls the execution of the following step S4.

[0121] S3, The controller controls the increase of VSP, so that VSP n =VSP. Then, repeat step S1 above.

[0122] S4. The controller acquires the ambient temperature Ta and the heat exchanger temperature Te. The controller determines whether the heat exchanger is in a state of severe frosting. If not, the controller executes step S3 above; if so, the controller executes step S5 below.

[0123] S5. The controller stops increasing VSP and adjusts the current control voltage to the voltage threshold, making VSP = VSP n The current control voltage will remain unchanged.

[0124] This application also provides a hardware structure diagram of a controller, such as... Figure 8 As shown, the controller 1000 includes a processor 1001. Optionally, the controller 1000 also includes a memory 1002 and a communication interface 1003 connected to the processor 1001. The processor 1001, memory 1002, and communication interface 1003 are connected via a bus 1004.

[0125] Processor 1001 may be a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. Processor 1001 may also be any other device with processing capabilities, such as a circuit, device, or software module. Processor 1001 may also include multiple CPUs, and processor 1001 may be a single-core processor or a multi-core processor. Here, "processor" may refer to one or more devices, circuits, or processing cores used to process data (e.g., computer program instructions).

[0126] The memory 1002 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or it may be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer. This application embodiment does not impose any limitations on this. The memory 1002 may exist independently or may be integrated with the processor 1001. The memory 1002 may contain computer program code. The processor 1001 is used to execute the computer program code stored in the memory 1002, thereby implementing the control method provided in this application embodiment.

[0127] The communication interface 1003 can be used to communicate with other devices or communication networks (e.g., Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc.). The communication interface 1003 can be a module, a circuit, a transceiver, or any device capable of enabling communication.

[0128] The bus 1004 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus 1004 can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 8 Only one thick line is used to represent the bus in the middle, but it does not mean that there is only one bus or only one type of bus.

[0129] The embodiment of the present application further provides a computer readable storage medium, which comprises computer execution instructions, and when the computer execution instructions run on a computer, the computer execution instructions make the computer execute the method provided by the above embodiment.

[0130] The embodiment of the present application further provides a computer program product, which can be directly loaded into a memory and contains software codes, and the computer program product can realize the method provided by the above embodiment after being loaded and executed by a computer.

[0131] Those skilled in the art should be aware that, in one or more examples described above, the functions described by the present application can be implemented by hardware, software, firmware or any combination thereof. When implemented by software, the functions can be stored in a computer readable medium or transmitted as one or more instructions or codes on a computer readable medium. The computer readable medium includes a computer storage medium and a communication medium, wherein the communication medium includes any medium that facilitates the transmission of computer programs from one place to another. The storage medium can be any available medium that can be accessed by a general or special purpose computer.

[0132] Through the above description of the embodiments, those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional modules is taken as an example for illustration, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0133] In several embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other manners. For example, the division of the apparatus embodiments is only illustrative and each division can not necessarily exist in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0134] In addition, each function unit in the various embodiments of the present application can be integrated into a processing unit, or each unit can exist physically as a separate unit, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software function unit. When the integrated unit is implemented in the form of a software function unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on such an understanding, the technical solutions of the embodiments of the present application essentially or substantially, or all or part of the technical solutions, can be embodied in the form of a software product. The software product is stored in a storage medium, and includes several instructions for causing an apparatus (which can be a single chip, a chip, etc.) or a processor to perform all or part of the steps of the methods in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, and the like, and any other medium that can store program codes.

[0135] The above is merely specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An air conditioning system, characterized by, The air conditioning system comprises: a heat exchanger; a direct current motor; a controller configured to: obtain a frosting state of the heat exchanger and an operating state of the direct current motor; in a case where the heat exchanger is in a serious frosting state and the direct current motor is in a target operating state, adjust a control voltage of the direct current motor to a voltage threshold value; wherein in the target operating state, a rotating speed of the direct current motor is less than a rotating speed threshold value and the control voltage is greater than the voltage threshold value; in a case where the heat exchanger is not in the serious frosting state, obtain an actual rotating speed and a required rotating speed of the direct current motor; if a difference between the actual rotating speed and the required rotating speed of the direct current motor is greater than a difference threshold value, increase the control voltage of the direct current motor; if the control voltage is greater than the voltage threshold value and the actual rotating speed is greater than the rotating speed threshold value, increase the voltage threshold value.

2. The air conditioning system of claim 1, wherein, In a preset time period, the control voltage of the direct current motor remains unchanged, and the preset time period is a time period after the control voltage of the direct current motor is adjusted to the voltage threshold value.

3. The air conditioning system of claim 1, wherein, The air conditioning system further comprises: a first temperature sensor for detecting an ambient temperature; a second temperature sensor for detecting a heat exchanger temperature; the controller is configured to obtain the frosting state of the heat exchanger, and specifically configured to: obtain the ambient temperature through the first temperature sensor and the heat exchanger temperature through the second temperature sensor; if the ambient temperature and the heat exchanger temperature satisfy a preset temperature condition, determine that the heat exchanger is in the serious frosting state.

4. A control method of an air conditioning system, characterized by, The method comprises: obtaining a frosting state of a heat exchanger and an operating state of a direct current motor; in a case where the heat exchanger is in a serious frosting state and the direct current motor is in a target operating state, adjusting a control voltage of the direct current motor to a voltage threshold value; wherein in the target operating state, a rotating speed of the direct current motor is less than a rotating speed threshold value and the control voltage is greater than the voltage threshold value; in a case where the heat exchanger is not in the serious frosting state, obtaining an actual rotating speed and a required rotating speed of the direct current motor; if a difference between the actual rotating speed and the required rotating speed of the direct current motor is greater than a difference threshold value, increasing the control voltage of the direct current motor; if the control voltage is greater than the voltage threshold value and the actual rotating speed is greater than the rotating speed threshold value, increasing the voltage threshold value.

5. The method of claim 4, wherein, In a preset time period, the control voltage of the direct current motor remains unchanged, and the preset time period is a time period after the control voltage of the direct current motor is adjusted to the voltage threshold value.

6. The method of claim 5, wherein, The method further comprises: obtaining an ambient temperature and a heat exchanger temperature; if the ambient temperature and the heat exchanger temperature satisfy a preset temperature condition, determining that the heat exchanger is in the serious frosting state.

Images