CN118408270A

CN118408270A - Air conditioning system and compressor starting control method thereof

Info

Publication number: CN118408270A
Application number: CN202310080033.0A
Authority: CN
Inventors: 李永正; 张永良; 王乐三
Original assignee: Hisense Air Conditioning Co Ltd
Current assignee: Hisense Air Conditioning Co Ltd
Priority date: 2023-01-29
Filing date: 2023-01-29
Publication date: 2024-07-30

Abstract

The embodiment of the application provides an air conditioning system and a compressor starting control method thereof, relates to the technical field of household appliances, and aims to at least solve the problems of poor starting or starting failure of a compressor caused by adopting fixed starting current in the related technology. The air conditioning system comprises a compressor, a motor and a controller which is respectively connected with the compressor and the motor; the controller is configured to perform: determining a target load torque corresponding to a current working parameter under a current working mode of the air conditioning system; determining a target starting current input to the current loop under the target load torque according to the corresponding relation between the load torque and the starting current; the first current threshold represents a maximum current threshold input to the current loop when switching from an open loop operation phase to a closed loop operation phase; the second current threshold represents the minimum current threshold input to the current loop when switching from the open loop operation phase to the closed loop operation phase; and controlling the starting of the compressor according to the target starting current.

Description

Air conditioning system and compressor starting control method thereof

Technical Field

The application relates to the technical field of household appliances, in particular to an air conditioning system and a compressor starting control method thereof.

Background

In the control process of the air conditioning system, the smooth start of the compressor is a key factor for ensuring the normal operation of the air conditioning system. The compressor start-up needs to be regulated based on the start-up current of the current loop. In general, the starting current is set to a fixed value when the compressor is started, so that a constant starting current is adopted in each starting process of the compressor. However, when the starting mode is adopted, the problem of poor starting or failure starting of the compressor often occurs, so that the success rate of successful starting of the compressor is reduced.

Disclosure of Invention

The embodiment of the application provides an air conditioning system and a compressor starting control method thereof, which at least solve the problem that the compressor is started poorly or failed due to the adoption of fixed starting current in the related art.

In a first aspect, an air conditioning system is provided, the air conditioning system comprising a compressor, a motor, and a controller respectively connected to the compressor and the motor; a compressor for compressing and driving a refrigerant in a circuit of the air conditioning system; the motor is used for driving the compressor to start; the controller is configured to perform: determining a target load torque corresponding to a current working parameter under a current working mode of the air conditioning system; determining a target starting current input to the current loop under the target load torque according to the corresponding relation between the load torque and the starting current; the target starting current is larger than the second current threshold and smaller than the first current threshold; the first current threshold represents a maximum current threshold input to the current loop when switching from an open loop operation phase to a closed loop operation phase; the second current threshold represents the minimum current threshold input to the current loop when switching from the open loop operation phase to the closed loop operation phase; and controlling the starting of the compressor according to the target starting current.

It should be noted that, in the related art, the starting current used for each start of the compressor is generally fixed, that is, the compressor is switched from the open-loop phase to the closed-loop phase at each start, and the compressor is started with the fixed starting current, even if the starting fails, the starting current value is still the same.

However, the use of a fixed starting current as described above suffers from the following drawbacks:

first, for a single rotor compressor, the load torques for different mechanical angles within a mechanical cycle are different. When the machine is restarted, the load torque is different when the machine is started due to different shutdown angles, if the machine is stopped at the angle with the maximum load torque, the machine needs to be started by larger starting current when the machine is restarted, otherwise, the machine is likely to be stopped due to too small current, the machine is failed to start, and the machine is continuously failed to start.

Secondly, because the air conditioning system is in different operation modes, different environment temperatures, coil temperatures and the continuous operation time of the compressor all can lead to different system loads facing the starting of the compressor, namely different load torque values facing the starting, a fixed starting current is adopted, the system load can be dragged and stopped when being overweight, the system load is too light, the open-loop rotation speed can be dragged and is too high, and finally the starting failure is caused.

Based on this, in the practical application process of the air conditioning system, the load and the starting current of the air conditioning system are not adapted, which can cause great difference between the different loads and the starting current, so that the compressor is started successfully with a fixed starting current. Therefore, by the starting mode for adjusting the starting current, starting failure caused by the fact that the starting current is not matched with the target load torque can be effectively avoided, and the failure rate of starting the compressor is reduced.

The technical scheme provided by the embodiment of the application at least has the following beneficial effects: considering the influence of the load of the air conditioning system on the starting current demand and abnormal changes of equipment parameters and operation parameters, the air conditioning system determines a given current corresponding to the target load torque of the current working mode and the current working parameters based on the corresponding relation between the load torque and the starting current so as to ensure that the starting current is matched with the target load torque, thereby improving the success rate of restarting the compressor.

In some embodiments, the controller performs determining a target load torque corresponding to a current operating parameter in a current operating mode of the air conditioning system, and is specifically configured to: and determining the target load torque according to the corresponding relation between the working parameters of the air conditioning system and the load torque of the air conditioning system in the working mode of the air conditioning system.

Based on the above, the air conditioning system is provided with a corresponding relation between the working parameters and the load torque so as to determine the target load torque, and the determination mode is simple in logic and convenient to query.

In some embodiments, the operating parameters include outdoor ambient temperature and outdoor coil temperature; the controller determines a target load torque according to a corresponding relation between an operating parameter of the air conditioning system and the load torque of the air conditioning system in an operating mode of the air conditioning system, and is specifically configured to: when the current working model is in a refrigeration mode or a dehumidification mode, the load torque corresponding to the target outdoor environment temperature and the target outdoor coil temperature in the refrigeration mode or the dehumidification mode is determined to be the target load torque.

Based on the above, for the operation scene of the air conditioning system in the refrigeration mode and the dehumidification mode, the obtained target load torque is more in accordance with the scene requirement of the refrigeration mode or the dehumidification mode based on the target outdoor environment temperature and the target outdoor coil temperature, so that the target load torque is more accurate.

In some embodiments, the operating parameters include indoor ambient temperature, indoor coil temperature; the controller is further specifically configured to: when the current working model is a heating mode, the load torque corresponding to the target indoor environment temperature and the target indoor coil temperature in the heating mode is determined to be the target load torque.

Based on the target load torque, which is obtained based on the target indoor environment temperature and the target indoor coil temperature aiming at the operation scene of the air conditioning system in the heating mode, the scene requirement of the heating mode is more met, so that the target load torque is more accurate.

In some embodiments, the controller, after performing controlling the compressor start according to the target start current, is further configured to: when the control of the compressor fails to start, determining the fault type of the failure of the start of the motor-driven compressor according to the operation parameters of the motor; the operation parameters are the operation parameters of the motor operation in the process of failure of starting the motor-driven compressor; the operating parameters include one or more of the following: three-phase current of the motor, running rotating speed in the running process of the motor and given rotating speed of a rotating speed ring, and reverse electromotive force of a stator of the motor; adjusting the target starting current according to the adjusting operation corresponding to the fault type; and controlling the compressor to restart according to the regulated target starting current.

And when the operation parameters of the motor meet a certain preset condition, correspondingly determining the fault type of the fault of the failure of starting the compressor.

The fault types are in one-to-one correspondence with the adjustment operations, namely, different adjustment operations are adopted for different fault types, and the starting current of the current loop is adjusted. The starting current is understood to be a reasonable current value of the input required by the given current reaching the open-loop stage and the open-loop stage switching to the closed-loop stage, that is, a reasonable current required by the d-axis given current to reach when the current loop is in the open-loop stage switching to the closed-loop stage, and the current cannot be larger or smaller.

It will be appreciated that when the compressor fails to start, a start-up current is associated. After the fault type of the compressor after the start failure is determined, the fault type can indicate whether the start current adopted by the start failure is larger or smaller. The corresponding adjusting operation is used for adjusting the starting current in the case of failed starting to the starting current direction representing successful starting. That is, the larger starting current is adjusted in a smaller direction and the smaller starting current is adjusted in a larger direction.

The above given rotational speed is also referred to as a set rotational speed. The operating parameters of the motor are also referred to as control parameters of the motor. The starting current is also referred to as the set current.

However, the use of a fixed starting current as described above also suffers from the following drawbacks:

Third, for each compressor, the compressor motor parameters, mechanical parameters, etc. may not be completely identical, i.e., for the same starting current, the air conditioning system may experience abnormal device parameters, i.e., some device parameters may not be adapted to the starting current.

For example, some compressors may have a low coefficient of friction, where if the starting current is high, the actual operating speed may be much greater than the given speed when the given speed is increased to the target speed, resulting in a speed control failure or an over-current failure shutdown after switching to the closed loop phase.

Fourth, the third problem is also caused when the compressor is subjected to parameter drift such as demagnetization due to high temperature or other factors, or other mechanical abnormality such as mechanical wear due to long-term operation.

Based on the above, in the practical application process of the air conditioning system, the abnormal conditions of parameters such as abnormal parameters of equipment, drifting of operating parameters of the motor and the like can occur due to the influence of the use environment and the influence of the use time. The abnormal conditions described above can lead to a large variation in the magnitude of the starting current required by the different compressors, and therefore, the use of a fixed starting current can lead to a low probability of successful compressor start-up. Therefore, by the starting mode for adjusting the starting current, the false starting operation of starting the compressor can be effectively prevented from being carried out again by continuously using the original starting current or using the fixed starting current, so that the invalid operation of restarting the compressor is reduced, and the failure rate of restarting the compressor is reduced.

In some embodiments, the controller performs determining, from the operating parameters of the motor, a fault type to which the motor-driven compressor start failure belongs, specifically configured to: determining that the fault type is a first fault type according to the condition that the operation parameters of the motor meet the first preset condition; wherein the operating parameters of the motor satisfy a first preset condition comprising one or more of: when the rotating speed ring is in an open-loop operation stage or is switched from the open-loop operation stage to a closed-loop operation stage, the three-phase current input to the motor is larger than a current threshold value; when the rotating speed ring is switched from the open-loop operation stage to the closed-loop operation stage, a first rotating speed difference value between the operation rotating speed of the motor in the operation process and the corresponding given rotating speed is larger than a first rotating speed difference value threshold value, and the first rotating speed difference value threshold value is larger than 0.

The first fault type may be characterized as a fault type causing a fault with a small starting current, i.e. the first fault type indicates a fault type corresponding to a starting current smaller than the actual demand.

The first rotational speed difference is a difference between the operating rotational speed and the given rotational speed, i.e., the first rotational speed difference is equal to the operating rotational speed minus the given rotational speed. The above-described operation rotational speed is understood to be an actual operation rotational speed, which is also referred to as an actual rotational speed.

In some embodiments, the speed ring is also referred to as a speed ring.

In this embodiment, a fault type corresponding to a fault that causes a smaller starting current is determined as a first fault type by a magnitude relation between an operation parameter of a motor and a corresponding parameter threshold in a failure process of starting the compressor.

According to the embodiment, based on the operation parameters of different stages in the starting process of the compressor, a plurality of first preset conditions with different judgment dimensions are established, so that a plurality of modes for determining the first fault type are set, the first fault type can be determined from different dimensions, the form for determining the first fault type is rich, and the difficulty for determining the first fault type is simplified.

In some embodiments, the controller performs determining, from the operating parameters of the motor, a fault type to which the motor-driven compressor start failure belongs, specifically configured to: determining that the fault type is a second fault type according to the fact that the operation parameters of the motor meet second preset conditions; wherein the operating parameters of the motor satisfy a second preset condition comprising one or more of: when the motor operates for a preset time, the operating rotating speed of the motor is smaller than a first rotating speed threshold value; when the rotating speed ring is switched from the open-loop operation stage to the closed-loop operation stage, a second rotating speed difference value between a given rotating speed and a corresponding operation rotating speed in the motor operation process is larger than a second rotating speed difference value threshold, and the second rotating speed difference value threshold is larger than 0; the back electromotive force of the stator of the motor is less than an electromotive force threshold.

The second fault type may be characterized as a fault type causing a fault with a larger starting current, i.e. the second fault type indicates a fault type corresponding to a starting current with a larger starting current than actually required.

The second rotation speed difference is a difference between a given rotation speed corresponding to the operation rotation speed and the operation rotation speed, that is, the second rotation speed difference is equal to the given rotation speed corresponding to the operation rotation speed minus the operation rotation speed.

In this embodiment, the fault type corresponding to the fault that causes the larger starting current is determined as the second fault type by the magnitude relation between the operation parameter of the motor and the corresponding parameter threshold in the process of the failure of the start of the compressor.

According to the embodiment, based on the operation parameters of different stages in the starting process of the compressor, a plurality of second preset conditions with different judgment dimensions are established, so that a plurality of modes for determining the second fault type are set, the second fault type can be determined from different dimensions, the form for determining the second fault type is rich, and the difficulty for determining the second fault type is simplified.

In some embodiments, the adjustment operation corresponding to the first fault type is a first current adjustment; the first current is adjusted to increase the target starting current by a first current step value; the controller executes an adjusting operation corresponding to the fault type, and is specifically configured to: adjusting the target starting current according to the first current adjustment corresponding to the first fault type; the target starting current after the first current adjustment is smaller than a first current threshold.

Based on this, when the starting current is small due to a fault of the first fault type, the first current regulation is performed on the small starting current.

In some embodiments, after controlling the compressor to restart according to the regulated starting current, the controller is further configured to: when the restarting of the compressor is controlled to fail according to the starting current after the first current adjustment, if the starting current after the first current adjustment is smaller than a first current threshold value, the first current adjustment is continuously carried out on the starting current until the restarting of the compressor is controlled to succeed according to the starting current after the first current adjustment, or when the starting current after the first current adjustment is larger than or equal to the first current threshold value, the first current adjustment is stopped.

In some embodiments, multiple first current adjustments to the starting current are required to enable the compressor to start successfully.

Based on the above, when the starting current is smaller due to the fault of the first fault type, the first current adjustment is repeatedly executed on the smaller starting current so as to ensure that the compressor is started successfully.

In some embodiments, the adjustment operation corresponding to the second fault type is a second current adjustment; the second current is adjusted to reduce the target starting current by a second current step value; the controller executes an adjusting operation corresponding to the fault type, and is specifically configured to: adjusting the target starting current according to the second current adjustment corresponding to the second fault type; the second current regulated target starting current is greater than a second current threshold.

Based on the above, when the starting current is larger due to the fault of the second fault type, the second current adjustment is performed on the larger starting current so as to ensure that the compressor is started successfully.

In some embodiments, after controlling the compressor to restart according to the regulated starting current, the controller is further configured to: and when the restarting of the compressor is controlled to fail according to the starting current after the second current adjustment, if the starting current after the second current adjustment is larger than a second current threshold value, continuing to execute the second current operation on the starting current successively until the restarting of the compressor is controlled to succeed according to the starting current after the second current adjustment, or stopping executing the second current adjustment on the starting current when the starting current after the second current adjustment is smaller than or equal to the second current threshold value.

In some embodiments, a second plurality of current adjustments to the starting current are required to enable the compressor to start successfully.

Based on the above, when the starting current is larger due to the fault of the second fault type, the second current adjustment is repeatedly executed on the larger starting current so as to ensure that the compressor is started successfully.

In some embodiments, the motor is a permanent magnet synchronous motor.

In a second aspect, there is provided a compressor start control method of an air conditioning system, the method comprising: determining a target load torque corresponding to a current working parameter in a current working mode of the air conditioning system; determining a target starting current input to the current loop under the target load torque according to the corresponding relation between the load torque and the starting current; the target starting current is larger than the second current threshold and smaller than the first current threshold; the first current threshold represents a maximum current threshold input to the current loop when switching from an open loop operation phase to a closed loop operation phase; the second current threshold represents the minimum current threshold input to the current loop when switching from the open loop operation phase to the closed loop operation phase; and controlling the starting of the compressor according to the target starting current.

In a third aspect, embodiments of the present application provide a computer-readable storage medium having instructions stored therein that, when run on any one of the above-described apparatuses, cause the apparatus to perform any one of the above-described compressor start control methods.

In a fourth aspect, embodiments of the present application provide a chip, comprising: a processor and a memory; the memory is used for storing computer execution instructions, and the processor is connected with the memory, and when the chip runs, the processor executes the computer execution instructions stored in the memory so as to enable the chip to execute any one of the compressor starting control methods.

In a fifth aspect, embodiments of the present application provide a computer program product comprising instructions that, when run on any of the above-described apparatuses, cause an apparatus to perform any of the above-described compressor start control methods.

In the embodiment of the present application, the names of the components of the foregoing apparatus do not limit the device itself, and in actual implementation, these components may appear under other names. Insofar as the function of the individual components is similar to that of the embodiments of the present application, it is within the scope of the claims of the present application and the equivalents thereof.

In addition, the technical effects of any one of the design manners of the second aspect to the fifth aspect may be referred to as the technical effects of the different design manners of the first aspect, which are not described herein.

Drawings

The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate and do not limit the application.

Fig. 1 is a schematic diagram of an air conditioning system according to an embodiment of the present application;

fig. 2 is a circuit system architecture diagram of an air conditioning system according to an embodiment of the present application;

Fig. 3 is a flowchart of a method for controlling the start of a compressor of an air conditioning system according to an embodiment of the present application;

FIG. 4 is a schematic diagram illustrating a relationship between a starting current and a load torque of an air conditioning system according to an embodiment of the present application;

FIG. 5 is a flowchart of a method for controlling the start of a compressor of another air conditioning system according to an embodiment of the present application;

fig. 6 is a flowchart of another method for controlling the start of a compressor of an air conditioning system according to an embodiment of the present application;

fig. 7 is a flowchart of another method for controlling the start of a compressor of an air conditioning system according to an embodiment of the present application;

fig. 8 is a flowchart of another method for controlling the start of a compressor of an air conditioning system according to an embodiment of the present application;

fig. 9 is a flowchart of another method for controlling the start of a compressor of an air conditioning system according to an embodiment of the present application;

fig. 10 is a flowchart of a compressor start control method of another air conditioning system according to an embodiment of the present application;

Fig. 11 is a schematic hardware structure of a controller according to an embodiment of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art. In addition, when describing a pipeline, the terms "connected" and "connected" as used herein have the meaning of conducting. The specific meaning is to be understood in conjunction with the context.

In embodiments of the application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In view of the above, an embodiment of the present application provides an air conditioning system, which can determine a given current corresponding to a target load torque of a current working mode and a current working parameter based on a corresponding relation between the load torque and the starting current, so as to ensure that the starting current is matched with the target load torque, thereby improving a success rate of restarting a compressor.

In the embodiment of the application, the air conditioning system comprises air conditioning equipment, the communication device is applied to the air conditioning equipment, the air conditioning equipment can be multi-split air conditioning equipment, single-machine air conditioning equipment and the like, the multi-split air conditioning equipment comprises an outdoor unit and a plurality of indoor units, and the single-machine air conditioning equipment comprises an outdoor unit corresponding to one indoor unit.

In order to further facilitate the description of the solution of the present application, the air conditioning system of the present application will be described in detail below by taking a stand-alone air conditioning apparatus as an example.

Referring to fig. 1 and 2, an air conditioning system 100 may include: an outdoor unit 200, an indoor unit 300, and a motor 101, and a controller 103. The outdoor unit 200 includes: an outdoor heat exchanger 201, a compressor 202, a four-way valve 203, a bypass shutoff valve 204, an outdoor solenoid valve 205, and an outdoor throttle device 206. Wherein the air conditioning system comprises a compressor 202 and a motor 101, both of which are connected to a controller 103. The compressor 202 is used for compressing and driving the refrigerant in the air conditioning system loop; the motor 101 is used for driving the compressor to start.

In some embodiments, the motor 101 is disposed on the compressor 202.

In some embodiments, the motor is a permanent magnet synchronous motor; the refrigerant is also referred to as a refrigerant.

In some embodiments, the outdoor unit further includes an outdoor liquid pipe temperature sensor 207.

In some embodiments, the compressor 202, the four-way valve 203, the outdoor heat exchanger 201 in the outdoor unit 200, the indoor expansion valve in each indoor unit, the indoor heat exchanger 301, and the circulation bypass solenoid valve are sequentially connected through pipelines to form a refrigerant circulation loop.

In some embodiments, the outdoor heat exchanger 201 is connected to the compressor 202 at one end via the four-way valve 203 and to the indoor heat exchanger 301 at the other end. The outdoor heat exchanger 201 is configured to exchange heat between the outdoor air and the refrigerant flowing through the heat transfer pipe of the outdoor heat exchanger 201.

In some embodiments, the compressor 202 is disposed between the indoor heat exchanger and the outdoor heat exchanger 201 for powering the refrigerant cycle. Taking the cooling mode as an example, the compressor 202 sends the compressed refrigerant to the outdoor heat exchanger 201 through the four-way valve 203. Alternatively, the compressor 202 may be a variable capacity inverter compressor 202 controlled based on the rotational speed of the inverter.

In some embodiments, four ports of the four-way valve 203 are respectively connected to the exhaust port of the compressor 202, the outdoor heat exchanger 201, the air suction port of the compressor 202, and the indoor heat exchangers of the respective indoor units. The four-way valve 203 is used to change the flow direction of the refrigerant in the system pipeline to realize the mutual conversion between the cooling mode and the heating mode.

In some embodiments, the bypass cut-off valve 204 is disposed between the four-way valve 203 and the indoor heat exchanger of each indoor unit, and the bypass cut-off valve 204 is kept in a normally open state after the installation of the air conditioning system is completed.

In some embodiments, the outdoor solenoid valve 205 is disposed on a refrigerant bypass branch between the four-way valve 203 and each indoor heat exchanger, for controlling the communication and cut-off of the refrigerant bypass branch.

In some embodiments, an outdoor throttle device 206 is disposed between the outdoor solenoid valve 205 and the compressor 202 for reducing the pressure of the high-temperature and high-pressure refrigerant delivered by the compressor discharge. For example, the outdoor throttle device 206 may include an electronic expansion valve and/or a capillary tube.

Alternatively, the outdoor throttle device 206 may be provided between the outdoor solenoid valve 205 and the bypass shutoff valve 204.

Alternatively, the outdoor throttle device 206 may be provided between the bypass shutoff valve 204 and each indoor unit. The application is not limited in this regard.

In some embodiments, the outdoor unit 200 further includes an outdoor fan (not shown) that generates an airflow of the outdoor air passing through the outdoor heat exchanger 201 to promote heat exchange between the refrigerant flowing in the heat transfer tubes of the outdoor heat exchanger 201 and the outdoor air.

In some embodiments, the outdoor unit 200 further includes an outdoor fan motor (not shown) connected to the outdoor fan for driving or varying the rotational speed of the outdoor fan.

In some embodiments, the outdoor unit 200 further includes a high-pressure switch (not shown in the figures), and the high-pressure switch is electrically connected to the controller 103, so as to monitor the pressure of the air conditioning pipeline, and when the pipeline pressure of the air conditioning system 100 is abnormal, send abnormal information to the controller 103, so that the controller 103 controls the system to stop, and ensure the normal operation of the air conditioning system 100.

Further, the indoor unit 300 includes: an indoor heat exchanger 301, an indoor expansion valve 302, a bypass solenoid valve 303, and a circulation bypass solenoid valve 304.

In some embodiments, the indoor unit 300 further includes an indoor liquid pipe temperature sensor 305 and an indoor fan 306.

In some embodiments, the discharge port of the compressor 202, the outdoor throttling device 206, the outdoor solenoid valve 205, the bypass cut-off valve 204, and the bypass solenoid valve and the indoor heat exchanger in the indoor unit are sequentially connected through pipelines to form a refrigerant bypass.

In some embodiments, the indoor heat exchanger 301 is configured to exchange heat between a refrigerant flowing in a heat transfer pipe of the indoor heat exchanger 301 and indoor air.

In some embodiments, the indoor expansion valve 302 is disposed between the indoor heat exchanger 301 and the outdoor heat exchanger 201, and has a function of expanding and decompressing the refrigerant flowing through the electronic expansion valve, and can be used to adjust the supply amount of the refrigerant in the pipeline.

In some embodiments, a bypass solenoid valve 303 is disposed between the indoor heat exchanger 301 and the four-way valve 203, for controlling the communication and cut-off of the refrigerant bypass of a single indoor unit.

In some embodiments, a circulation branch electromagnetic valve 304 is disposed between the indoor heat exchanger 301 and the four-way valve 203, for controlling the communication and cut-off of the refrigerant circulation branch of the single indoor unit.

In some embodiments, an indoor liquid pipe temperature sensor 301 is provided to the liquid pipe of the indoor heat exchanger 301 for detecting the liquid pipe temperature of the indoor heat exchanger 301.

In some embodiments, the indoor fan 306 generates an airflow of the indoor air passing through the indoor heat exchanger 301 to promote heat exchange of the refrigerant flowing in the heat transfer tubes of the indoor heat exchanger 301 with the indoor air.

In some embodiments, the indoor unit 300 further includes a display 102. There is an electrical connection between the display 102 and the controller 103. Optionally, the display 102 is used to display a control panel of the air conditioning system 100, for example, the display 102 may be used to display a current operating state of the air conditioning system, such as a successful compressor start or a failed compressor start.

Alternatively, the display 102 is connected to the controller 103, and a user can perform an operation on the control panel through the display 102 to set a program.

Optionally, the display 102 further includes a pressure sensor or a temperature sensor, and the display 102 may transmit a user instruction to the control to implement the man-machine interaction function according to a gesture operation of the user, such as pressing a key, etc.

Alternatively, the display 102 may be a liquid crystal display 102, an organic light emitting diode (orgn i cl i ght-EM I TT I NG D I ode, OLED) display 102. The particular type, size, resolution, etc. of the display 102 is not limited, and those skilled in the art will appreciate that the display 102 may be modified in performance and configuration as desired.

In some embodiments, the controller 103 refers to a device that may generate an operation control signal according to a command operation code and a timing signal, and instruct the air conditioning system 100 to execute a control command.

By way of example, the controller 103 may be a central processing unit (centr l process i ng un i t, CPU), a general purpose processor network processor (network processor, NP), a digital signal processor (D I G I T L S I GN L process i ng, DSP), a microprocessor, a microcontroller, a programmable logic device (progrmmb l e l og i c dev i ce, PLD), or any combination thereof. The controller 103 may also be other devices with processing functions, such as a circuit, a device, or a software module, which is not limited in any way by the embodiment of the present application.

Although not shown in fig. 1, the air conditioning system 100 may further include a power supply device (such as a battery and a power management chip) for supplying power to the respective components, and the battery may be logically connected to the controller through the power management chip, thereby performing functions of power consumption management and the like of the air conditioning system 100 through the power supply device.

A circuit system architecture diagram of the air conditioning system 100 is schematically shown in fig. 2. The air conditioning system 100 may further include: the system comprises an early warning device 104, a communication device 105, a man-machine interaction device 106 and a power supply 107.

The early warning device 104, the communication device 105, the man-machine interaction device 106 and the power supply 107 are all connected with the controller 103.

In some embodiments, the pre-alarm 104 is configured to send corresponding pre-alarm information when the start-up of the compressor fails, so as to prompt the user that the start-up of the compressor fails.

In some embodiments, the communication device 105 is a component for communicating with an external apparatus or external server according to various communication protocol types. For example: the communication device may include at least one of W i-F i chips, bluetooth communication protocol chips, other network communication protocol chips such as wired ethernet communication protocol chips or near field communication protocol chips, and infrared receivers.

In some embodiments, the air conditioning system 100 may transmit control signals and data signals between the communication device 105 and terminal devices (e.g., mobile phones, tablet computers, wearable mobile devices, etc.), other home devices (e.g., air conditioners, monitoring devices, etc.), and servers used by users. For example, the user issues an instruction to turn on the operation mode (such as turning on the heating mode, the cooling mode, or the dehumidifying mode, or the sterilizing operation mode) through the mobile phone, the air conditioning system 100 receives the instruction through the communication device 105, and the controller 103 of the air conditioning system 100 turns on the corresponding operation mode in response to the instruction to turn on the operation mode.

In some embodiments, the human-computer interaction device 106 is configured to implement interaction between a user and the air conditioning system 100. The human-machine interaction device 106 may include one or more of physical keys, a touch-sensitive display panel, or a voice recognition device. For example, the user may start the air conditioning system 100 to start working through the man-machine interaction device 106, or may set an operation program of the air conditioning system 100 through the man-machine interaction device 106.

In some embodiments, the power supply 107 provides power supply support for the air conditioning system 100 from power input from an external power source under the control of the controller 103.

Based on the above air conditioning system, as shown in fig. 3, an embodiment of the present application provides a compressor start control method, which includes the following steps:

Step S301, determining a target load torque corresponding to a current working parameter in a current working mode of the air conditioning system.

Step S302, determining a target starting current input to the current loop under the target load torque according to the corresponding relation between the load torque and the starting current.

The target starting current is larger than a second current threshold value and smaller than a first current threshold value; the first current threshold represents a maximum current threshold input to the current loop when switching from an open loop operation phase to a closed loop operation phase; the second current threshold characterizes a minimum current threshold input to the current loop when switching from the open-loop operating phase to the closed-loop operating phase.

For example, the correspondence between the load torque and the start-up current may be a correspondence as shown in fig. 4. It is understood that the correspondence relationship between the load torque Q and the start-up current I _start of the air conditioning system is shown in the following formula (1).

Where i is the current start-up period and k is a constant.

Step S303, controlling the start of the compressor according to the target start current.

The compressor starting process is mainly divided into three phases, namely the following first phase to third phase:

(1) The first phase is the rotor positioning phase, i.e. the speed loop is in an open loop operation phase of the open loop. In this first stage, the rotational speed is set to 0; the first phase is continued for a certain time, given the d-axis current as the start-up current.

(2) The second phase is an open loop drag phase, i.e. a switching phase in which the tacho-ring is in a switch from an open loop operating phase to a closed loop operating phase. That is, when the speed ring is in the open-loop operation phase, the set rotational speed is increased to a rotational speed value required for switching the closed loop at a certain frequency increasing rate within a prescribed time, that is, the target rotational speed: ωr_set _switch, the given d-axis current modulus remains unchanged.

(3) The third phase is a closed loop operating phase. In this third stage, when the given rotational speed reaches the rotational speed value required for switching the loop, such as the above given rotational speed reaching the target rotational speed ωr_set _switch, the rotational speed loop input introduces an estimated actual operating rotational speed feedback, and the rotational speed error obtained after the difference between the given rotational speed and the actual operating rotational speed is sent to the speed loop controller. The output value of the speed loop controller is used for the calculation of the subsequent current loop and the d-axis current is reduced to 0 at a given rate. Typically, the speed loop controller is a PI controller.

The technical solution shown in fig. 3 brings at least the following advantages: considering the influence of the load of the air conditioning system on the starting current demand, the air conditioning system determines a given current corresponding to the target load torque of the current working mode and the current working parameter based on the corresponding relation between the load torque and the starting current, so as to ensure that the starting current is matched with the target load torque, thereby improving the success rate of restarting the compressor.

As an embodiment for determining the target load torque, the above step S302 may be specifically implemented as follows:

And determining the target load torque according to the corresponding relation between the working parameters of the air conditioning system and the load torque of the air conditioning system in the working mode of the air conditioning system.

Based on the embodiment, the air conditioning system is provided with the corresponding relation between the working parameters and the load torque so as to determine the target load torque, and the determination mode is simple in logic and convenient to query.

In one embodiment, the operating modes include a cooling mode and a dehumidification mode, and the corresponding operating parameters include an outdoor ambient temperature and an outdoor coil temperature. Referring to fig. 3, as shown in fig. 5, the controller may determine a target load torque based on a correspondence between an operation parameter and a load torque of the air conditioning system, so as to implement the above step S301.

In step S301A, when the current operation model is the cooling mode or the dehumidifying mode, the load torque corresponding to the target outdoor environment temperature and the target outdoor coil temperature in the cooling mode or the dehumidifying mode is determined as the target load torque.

For example, in the refrigeration mode or the dehumidification mode, the correspondence between the outdoor environment temperature, the outdoor coil temperature and the load torque may be determined by obtaining the function model f1 through a model training algorithm. Its correspondence may be expressed as q=f ₁(runModeSet,T_inDoor,T_inCoil,T_outDoor,T_outCoil);

The function model f1 characterizes the corresponding relation between the outdoor environment temperature, the outdoor coil temperature, the indoor environment temperature, the indoor coil temperature and the load torque in each working mode; the air conditioning system has an operating mode of runModeSet, an indoor ambient temperature of T _inDoor, an indoor coil temperature of T _inCoil, an outdoor ambient temperature of T _outDoor, an outdoor coil temperature of T _outCoil, and a load torque of the air conditioning system of Q.

As another example, the target load torque in the cooling mode or the dehumidification mode may also be determined by the correspondence relationship between the outdoor ambient temperature, the outdoor coil temperature, and the load torque as shown in table 1.

TABLE 1

Wherein, in table 1 above, T _outcoil-T_outdoor is the difference E _out(i);T_out (i) between the outdoor coil temperature and the outdoor ambient temperature, indicating that the outdoor ambient temperature T _outdoor is in a different temperature range, i=1, 2,3.

Based on the above, for the operation scene of the air conditioning system in the refrigeration mode and the dehumidification mode, the corresponding relation among the outdoor environment temperature, the outdoor coil temperature and the load torque is set, so that the target load torque is obtained based on the target outdoor environment temperature and the target outdoor coil temperature, the target load torque is enabled to meet the scene requirement of the refrigeration mode or the dehumidification mode, and the target load torque is enabled to be more accurate.

In another embodiment, the operating mode comprises a heating mode and the corresponding operating parameters comprise indoor ambient temperature, indoor coil temperature. Referring to fig. 3, as shown in fig. 5, the controller may determine a target load torque based on a correspondence between an operation parameter and a load torque of the air conditioning system, so as to implement the above step S301.

In step S301B, when the current working model is the heating mode, the load torque corresponding to the target indoor environment temperature and the target indoor coil temperature in the heating mode is determined as the target load torque.

The corresponding relation between the indoor environment temperature, the indoor coil temperature and the load torque can be obtained through a model training algorithm to obtain the function model f1 for determination in an exemplary heating mode.

As another example, the target load torque in the heating mode may also be determined by the correspondence between the indoor environment temperature, the indoor coil temperature, and the load torque as shown in table 2. Wherein, T _incoil-T_indoor in Table 2 below is the difference between the outdoor coil temperature and the outdoor ambient temperature. T _in (i) represents the indoor ambient temperature T _indoor in different temperature ranges, where i=1, 2,3.

TABLE 2

Based on the embodiment, aiming at the operation scene of the air conditioning system in the heating mode, the obtained target load torque is more in line with the scene requirement of the heating mode based on the target indoor environment temperature and the target indoor coil temperature, so that the target load torque is more accurate.

As an embodiment, as shown in fig. 6, the controller may specifically perform the following steps after performing the above step S303:

In step S601, when the control of the compressor fails to start, the fault type to which the motor-driven compressor fails to start is determined according to the operation parameters of the motor.

And when the start of the compressor fails, sending a start failure instruction of the compressor to the controller.

The operation parameters of the motor are the operation parameters of the motor in the failure process of starting the motor-driven compressor. The operating parameters may include one or more of the following: three-phase current of the motor, operating speed during operation of the motor and given speed of the speed ring and counter electromotive force of the stator of the motor.

In the implementation step, when the operation parameters of the motor meet a certain preset condition, correspondingly, determining the fault type of the fault, namely the failure of starting the compressor. The fault types are in one-to-one correspondence with the regulating operations, that is, different regulating operations are adopted for different fault types to regulate the starting current.

Step S602, according to the corresponding adjusting operation of the fault type, the starting current of the motor is adjusted.

Further, the starting current mentioned above can be understood that the given current reaches a reasonable current value of the input required for the open-loop phase and the open-loop phase to switch to the closed-loop phase, that is, the reasonable current required for the d-axis given current to reach when the current loop is in the open-loop phase to switch to the closed-loop phase can not be larger or smaller.

For example, for a starting process of the motor, the current loop is started with a fixed starting current in an open loop phase and in a closed loop phase.

Step S603, controlling the compressor to restart according to the regulated starting current.

The above given rotational speed is also referred to as a set rotational speed. The operating parameters of the motor are also referred to as control parameters of the motor.

However, in the related art, the following drawbacks occur due to the adoption of the fixed starting current:

Based on the above, in the practical application process of the air conditioning system, the abnormal conditions of parameters such as abnormal parameters of equipment, drifting of operating parameters of the motor and the like can occur due to the influence of the use environment and the influence of the use time. The abnormal conditions described above can lead to a large variation in the magnitude of the starting current required by the different compressors, and therefore, the use of a fixed starting current can lead to a low probability of successful restarting of the compressors. Therefore, by the starting mode for adjusting the starting current, the false starting operation of starting the compressor can be effectively prevented from being carried out again by continuously using the original starting current or using the fixed starting current, so that the invalid operation of restarting the compressor is reduced, and the failure rate of restarting the compressor is reduced.

The technical solution shown in fig. 6 brings at least the following advantages: considering the influence of abnormal changes of equipment parameters and operation parameters, the air conditioning system can determine the fault type of the fault of the failure of the compressor starting based on the operation parameters of the motor starting operation when the compressor starting fails; and based on the corresponding adjusting operation of the fault type, the starting current adopted during restarting is reasonably adjusted, so that the starting current during restarting is matched with the current equipment parameters and the current running parameters of the air conditioning system, and the success rate of restarting the compressor is improved.

In one embodiment, the preset conditions include a first preset condition and a second preset condition, where the two preset conditions are used to determine the first fault type and the second fault type, respectively.

As an embodiment for determining the first fault type, as shown in fig. 7, based on the first preset condition, the above step S602 may be implemented in the following manner:

S602A, when the operation parameters of the motor meet a first preset condition, determining that the fault type is a first fault type.

The operation parameters of the motor meet first preset conditions, and the method comprises the following judgment modes:

When the rotating speed ring is in an open-loop operation stage or is switched from the open-loop operation stage to a closed-loop operation stage, and when the three-phase current input to the motor is larger than a current threshold value, the fault type is a first fault type.

Secondly, when the rotating speed ring is switched from an open-loop operation stage to a closed-loop operation stage, and when a first rotating speed difference value between an operation rotating speed in the motor operation process and a corresponding given rotating speed is larger than a first rotating speed difference value threshold value, the fault type is a first fault type. Wherein the first rotational speed difference threshold is greater than 0.

The first fault type may be characterized as a fault type that causes a fault that the target rotational speed is smaller, that is, the first fault type indicates a fault type corresponding to the target rotational speed that is smaller than the actual demand.

In some embodiments, the speed ring is also referred to as a speed ring.

In this embodiment, the fault type corresponding to the fault that causes the target rotation speed to be smaller is determined as the first fault type by the magnitude relation between the operation parameter of the motor and the corresponding parameter threshold in the process of the failure of the start of the compressor.

As an embodiment for determining the second fault type, as shown in fig. 7, the above step S602 may be further implemented by:

S602B, when the operation parameters of the motor meet a second preset condition, determining that the fault type is a second fault type.

The operation parameters of the motor meet a second preset condition, and the method comprises the following judgment modes:

First, when the motor runs for a preset time period and the running rotating speed of the motor is smaller than a first rotating speed threshold value, the fault type is a second fault type.

Secondly, when the rotating speed ring is switched from the open-loop operation stage to the closed-loop operation stage, if a second rotating speed difference value between a given rotating speed and a corresponding operation rotating speed in the motor operation process is larger than a second rotating speed difference value threshold value, the second rotating speed difference value threshold value is larger than 0; the fault type is a second fault type.

Thirdly, when the back electromotive force of the stator of the motor is smaller than the electromotive force threshold value, the fault type is a second fault type.

The second fault type may be characterized as a fault type that causes a fault that is larger in the target rotational speed, that is, the second fault type indicates a fault type corresponding to the target rotational speed that is larger than the actual demand.

In this embodiment, the fault type corresponding to the fault that causes the target rotation speed to be larger is determined as the second fault type by the magnitude relation between the operation parameter of the motor and the corresponding parameter threshold in the process of the failure of the start of the compressor.

In some embodiments, the adjustment operation corresponding to the first fault type is a first current adjustment; the first current is regulated as an operation to increase the starting current by a first current step value. Based on this embodiment, as shown in fig. 8 in combination with fig. 6, the above step S603 may be implemented in the following manner:

and S603A, adjusting the starting current according to the first current adjustment corresponding to the first fault type.

The starting current regulated by the first current is smaller than a first current threshold; the first current threshold characterizes a maximum current threshold input to the current loop when switching from the open-loop operating phase to the closed-loop operating phase.

As one embodiment, in some embodiments, multiple first current adjustments to the starting current are required to enable the compressor to start up successfully. Specific implementation steps for this scenario are shown in fig. 9.

S901, a first current adjustment is performed on a start-up current.

S902, controlling the compressor to restart according to the starting current after the first current adjustment.

S903, judging whether restarting of the compressor fails, if yes, entering step S904; if not, ending.

S904, judging whether the starting current after the first current adjustment is smaller than a first current threshold value; if yes, go to step S901; if not, ending.

In the implementation step, when the compressor is controlled to restart according to the starting current after the first current adjustment, if the starting current after the first current adjustment is smaller than the first current threshold value, the first current adjustment is continuously performed on the starting current until the compressor is controlled to restart successfully according to the starting current after the first current adjustment, or when the starting current after the first current adjustment is greater than or equal to the first current threshold value, the first current adjustment is stopped.

When the fault type is the first fault type, the starting current is increased by a first current step value, and the compressor is controlled to be started again successively according to the starting current after the first current step value is increased until the compressor is started again successfully. And when the compressor is started again successfully, stopping updating the starting current to the starting current after the first current step value is gradually increased. The starting current after the first current step value is increased is smaller than the first current threshold value.

In another example, the starting current is increased by a first current step value, and the compressor is controlled to start again successively according to the starting current after the first current step value is increased until the starting current after the first current step value is increased is greater than or equal to the first current threshold value, and the starting current is stopped from being updated to the starting current after the first current step value is increased successively, so that the compressor is stopped from being controlled to start again successively.

In some embodiments, the regulation operation corresponding to the second fault type is a second current regulation; the second current is adjusted to reduce the start-up current by a second current step value. Based on this embodiment, as shown in fig. 8, the above step S603 may also be implemented in the following manner:

And S603B, adjusting the starting current according to the second current adjustment corresponding to the second fault type.

The starting current regulated by the second current is greater than the second current threshold. Wherein the second current threshold characterizes a minimum current threshold input to the current loop when switching from the open loop operating phase to the closed loop operating phase.

In some embodiments, a second plurality of current adjustments to the starting current are required to enable the compressor to start successfully. Specific implementation steps for this scenario are shown in fig. 10.

S111, performing a second current adjustment on the start-up current.

And S112, controlling the compressor to restart according to the starting current after the second current adjustment.

S113, judging whether restarting of the compressor fails, if so, entering step S114; if not, ending.

S114, judging whether the starting current after the second current adjustment is larger than a second current threshold value; if yes, go to step S111; if not, ending.

In the implementation step, when the compressor is controlled to restart according to the second current-regulated starting current, if the second current-regulated starting current is greater than the second current threshold, the second current operation is continuously performed on the starting current until the compressor is controlled to restart successfully according to the second current-regulated starting current, or when the second current-regulated starting current is less than or equal to the second current threshold, the second current regulation is stopped.

When the fault type is the second fault type, the starting current is gradually reduced by a second current step value, and the compressor is controlled to be started again according to the starting current after the second current step value is reduced gradually until the compressor is started again successfully. And stopping updating the starting current to the starting current after reducing the second current step value when the compressor is successfully restarted. The starting current after the second current step value is reduced is smaller than or equal to the second current threshold value.

In another example, the starting current is successively reduced by a second current step value, and the compressor is successively controlled to start again according to the starting current after the second current step value is reduced, until the starting current after the second current step value is reduced is less than or equal to the second current threshold value, the starting current is stopped from being updated to the starting current after the second current step value is reduced, and the compressor is stopped from being continuously controlled to start again.

As a specific embodiment, taking the starting current I _{init_start} (I) and the upper and lower limits of the starting current I _start max and I _start min as examples during the starting process of the compressor, the starting process of the compressor will be described as follows.

(1) And when the start of the compressor fails, judging the failure type of the start failure of the compressor.

(2) When the fault type is the first fault type, the starting current is regulated by adopting the following formula (1) and formula (2).

I _start(i+1)＝I_start (I) +ΔI formula (2)

I _start(i+1)＜I_start max formula (3)

Wherein, (i+1) is the number of the current start-up period; i _start (i+1) is the starting current of the current starting period; i _start (I) is the starting current of the last starting period; ΔI is the first current step value.

(3) When the fault type is the second fault type, the following formulas (4) and (5) are adopted to regulate the starting current.

I _start(i+1)＝I_start (I) - ΔI formula (4)

I _start(i+1)＞＝I_start min formula (5)

Wherein the first current step value is also Δi.

It can be seen that the foregoing description of the solution provided by the embodiments of the present application has been presented mainly from a method perspective. To achieve the above-mentioned functions, embodiments of the present application provide corresponding hardware structures and/or software modules that perform the respective functions. Those of skill in the art will readily appreciate that the various illustrative modules and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The embodiment of the application can divide the functional modules of the controller according to the method example, for example, each functional module can be divided corresponding to each function, and two or more functions can be integrated in one processing module. The integrated modules may be implemented in hardware or in software functional modules. Optionally, the division of the modules in the embodiment of the present application is schematic, which is merely a logic function division, and other division manners may be implemented in practice.

The embodiment of the application also provides a hardware structure schematic diagram of the controller. As shown in fig. 11, the controller 103 includes a processor 801, and optionally, a memory 802 and a communication interface 803 connected to the processor 801. The processor 801, the memory 802, and the communication interface 803 are connected by a bus 804.

The processor 801 may be a central processing unit (centra l process i ng un i t, CPU), a general purpose processor network processor (network processor, NP), a digital signal processor (D I G I TA L S I GNA L process i ng, DSP), a microprocessor, a microcontroller, a programmable logic device (programmab l e l og i c dev i ce, PLD), or any combination thereof. The processor 801 may also be any other means for performing a processing function, such as a circuit, device, or software module. The processor 801 may also include multiple CPUs, and the processor 801 may be a single-core (s i ng i e-CPU) processor or a multi-core (mu i t i-CPU) processor. A processor herein may refer to one or more devices, circuits, or processing cores for processing data (e.g., computer program instructions).

Memory 802 may be a read-on-y memory (ROM) or other type of static storage device, random access memory (random access memory, RAM) or other type of dynamic storage device that may store static information and instructions, or an electrically erasable programmable read-only memory (E L ECTR I CA L L Y erasab l eprogrammab l e read-on-y memory, EEPROM), compact disc read-only memory (compact d i sc read-on-y memory) or other optical disk storage, optical disk storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, as embodiments of the application are not limited in this respect. The memory 802 may be separate or integrated with the processor 801. Wherein the memory 802 may contain computer program code. The processor 801 is configured to execute computer program codes stored in the memory 802, thereby implementing the compressor start control method of the air conditioning system provided in the embodiment of the present application.

The communication interface 803 may be used to communicate with other devices or communication networks (e.g., ethernet, radio access network (rad i o access network, RAN), wireless local area network (W I RE L ESS L oca larea networks, WLAN), etc. the communication interface 803 may be a module, circuit, transceiver, or any means capable of enabling communications.

The bus 804 may be a peripheral component interconnect standard (PER I PHERA L component I nterconnect, PC I) bus, or an extended industry standard architecture (extended I ndustry STANDARD ARCH I tecture, EI SA) bus, or the like. The bus 804 may be classified as an address bus, a data bus, a control bus, or the like. For ease of illustration, only one thick line is shown in FIG. 11, but not only one bus or one type of bus.

The embodiment of the application also provides a computer readable storage medium, which comprises computer execution instructions that when run on a computer cause the computer to execute any one of the compressor start control methods of the air conditioning system provided by the embodiment.

The embodiment of the application also provides a computer program product containing computer execution instructions, which when run on a computer, cause the computer to execute the compressor start control method of any one of the air conditioning systems provided in the embodiment.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using a software program, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer-executable instructions. When the computer-executable instructions are loaded and executed on a computer, the processes or functions in accordance with embodiments of the present application are fully or partially produced. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer-executable instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, from one website, computer, server, or data center by wired (e.g., coaxial cable, fiber optic, digital subscriber line (d i g i ta lsubscr i ber l i ne, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). Computer readable storage media can be any available media that can be accessed by a computer or data storage devices including one or more servers, data centers, etc. that can be integrated with the media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid state disk (so L I D STATE D I SK, SSD)), or the like.

Although the application is described herein in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a study of the drawings, the disclosure, and the appended claims. In the claims, the term "comprising" (compr i s i ng) does not exclude other elements or steps, and "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Although the application has been described in connection with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made without departing from the spirit and scope of the application. Accordingly, the specification and drawings are merely exemplary illustrations of the present application as defined in the appended claims and are considered to cover any and all modifications, variations, combinations, or equivalents that fall within the scope of the application. It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

The foregoing is merely illustrative of specific embodiments of the present application, and the scope of the present application is not limited thereto, but any changes or substitutions within the technical scope of the present application should be covered by the 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 is characterized by comprising a compressor, a motor and a controller which is respectively connected with the compressor and the motor;

The compressor is used for compressing and driving the refrigerant in the air conditioning system loop;

the motor is used for driving the compressor to start;

The controller is configured to perform:

determining a target load torque corresponding to a current working parameter under a current working mode of the air conditioning system;

Determining a target starting current input to the current loop under the target load torque according to the corresponding relation between the load torque and the starting current; the target starting current is larger than a second current threshold and smaller than a first current threshold; the first current threshold represents a maximum current threshold input to the current loop when switching from an open loop operation phase to a closed loop operation phase; the second current threshold represents a minimum current threshold input to the current loop when switching from the open loop operation phase to the closed loop operation phase;

And controlling the start of the compressor according to the target starting current.

2. The air conditioning system of claim 1, wherein the controller executing the determining the target load torque corresponding to the current operating parameter in the current operating mode of the air conditioning system is specifically configured to:

3. The air conditioning system of claim 2, wherein the operating parameters include an outdoor ambient temperature and an outdoor coil temperature; the controller executes the determination of the target load torque according to a corresponding relation between an operating parameter of the air conditioning system and the load torque of the air conditioning system in an operating mode of the air conditioning system, and is specifically configured to:

And when the current working model is in a refrigeration mode or a dehumidification mode, determining the load torque corresponding to the target outdoor environment temperature and the target outdoor coil temperature in the refrigeration mode or the dehumidification mode as the target load torque.

4. An air conditioning system according to claim 3, wherein the operating parameters include indoor ambient temperature, indoor coil temperature; the controller is further specifically configured to:

And when the current working model is a heating mode, determining the load torque corresponding to the target indoor environment temperature and the target indoor coil temperature in the heating mode as the target load torque.

5. The air conditioning system according to any one of claims 1 to 4, wherein after performing the controlling the compressor start according to the target start current, a controller is further configured to:

When the control of the start failure of the compressor is performed, determining the fault type of the start failure of the motor to drive the compressor according to the operation parameters of the motor; the operation parameters are the operation parameters of the motor operation in the process of failure in starting the motor to drive the compressor; the operating parameters include one or more of the following: three-phase current of the motor, an operation speed in the operation process of the motor and a given rotation speed of a rotation speed ring, and reverse electromotive force of a stator of the motor;

according to the corresponding adjusting operation of the fault type, adjusting the target starting current;

and controlling the compressor to restart according to the regulated target starting current.

6. The air conditioning system of claim 5, wherein the controller performs the determining, based on the operating parameter of the motor, a fault type to which the motor fails to drive the compressor, specifically configured to:

Determining that the fault type is a first fault type according to the operation parameters of the motor meeting a first preset condition;

wherein the operating parameter of the motor satisfies the first preset condition, including one or more of:

When the rotating speed ring is in an open-loop operation stage or is switched from the open-loop operation stage to a closed-loop operation stage, the three-phase current input to the motor is larger than a current threshold value;

When the rotating speed ring is switched from the open-loop operation stage to the closed-loop operation stage, a first rotating speed difference value between the operation rotating speed and the corresponding given rotating speed in the motor operation process is larger than a first rotating speed difference value threshold, and the first rotating speed difference value threshold is larger than 0.

7. The air conditioning system of claim 6, wherein the controller performs the determining, based on the operating parameter of the motor, a fault type to which the motor fails to drive the compressor, specifically configured to:

determining that the fault type is a second fault type according to the fact that the operation parameters of the motor meet a second preset condition;

Wherein the operating parameter of the motor satisfies the second preset condition, including one or more of:

when the motor operates for a preset time, the operating rotation speed of the motor is smaller than a first rotation speed threshold value;

When the rotating speed ring is switched from the open-loop operation stage to the closed-loop operation stage, a second rotating speed difference value between the given rotating speed and the corresponding operation rotating speed in the motor operation process is larger than a second rotating speed difference value threshold, and the second rotating speed difference value threshold is larger than 0;

The counter electromotive force of the stator of the motor is less than an electromotive force threshold.

8. The air conditioning system of claim 6, wherein the conditioning operation corresponding to the first fault type is a first current conditioning; the first current is adjusted to increase the target starting current by a first current step value; the controller executes the adjustment operation corresponding to the fault type, and is specifically configured to:

adjusting the target starting current according to the first current adjustment corresponding to the first fault type; the target starting current after the first current adjustment is smaller than the first current threshold.

9. The air conditioning system of claim 7, wherein the conditioning operation corresponding to the second fault type is a second current conditioning; the second current is adjusted to reduce the target starting current by a second current step value; the controller executes the adjustment operation corresponding to the fault type, and is specifically configured to:

Adjusting the target starting current according to the second current adjustment corresponding to the second fault type; the target starting current after the second current adjustment is greater than the second current threshold.

10. A compressor start control method of an air conditioning system, the method comprising:

Determining a target load torque corresponding to a current working parameter of the air conditioning system in a current working mode;

Determining a target starting current input to the current loop under the target load torque according to the corresponding relation between the load torque and the starting current; the target starting current is larger than a second current threshold and smaller than a first current threshold; the first current threshold characterizes a maximum current threshold input to the current loop when switching from the open loop operation phase to the closed loop operation phase; the second current threshold represents a minimum current threshold input to the current loop when switching from the open loop operation phase to the closed loop operation phase;

and controlling the starting of the compressor according to the target starting current.