Rotating speed control method and control system of compressor

Abstract

The invention relates to a rotating speed control method and a rotating speed control system for a compressor. The method comprises the following steps: acquiring an operation mode of a controller of the compressor; if the operation mode is a position mode, the position where the compressor is located, the current position height and the current environment temperature are obtained; acquiring a corresponding position tachometer according to the position and the current position height; searching a first maximum rotating speed V1max and a first target rotating speed V1t corresponding to the current environment temperature in a position rotating speed table corresponding to the position and the current position height; and when the current environment temperature of the compressor reaches the preset target temperature, the compressor is controlled to operate at the searched first maximum rotating speed V1max, and when the current environment temperature of the compressor reaches the preset target temperature, the compressor is controlled to operate at the searched first target rotating speed V1t. Regional environmental factors are considered, and position rotating speed control is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressor control, and in particular to a speed control method and control system of a compressor. Background Art

[0002] At present, for refrigeration equipment using compressors, it is necessary to control the start and stop of the compressor through a thermostat. However, with the improvement of living standards, people have put forward higher and higher requirements for the performance of refrigeration equipment, such as energy saving, fast cooling speed, low noise, etc. Therefore, efficient control of compressors has become a pain point in the industry. A compressor refers to a compressor that can continuously change the output energy by continuously adjusting its speed within a certain range through a control method or means relative to a motor with a constant speed.

[0003] The compressor is the heart of the refrigeration equipment, which determines the operating efficiency of the refrigeration equipment and is a high-energy-consuming device. At present, compressors are widely used in air conditioners, refrigerators, freezers, cold storage and other products. The compressor controller technology and the method of controlling the compressor speed directly determine the efficiency and overall performance of the compressor of the refrigeration equipment. It can be seen that the speed control process of the compressor needs to be continuously innovated, otherwise it will not meet the needs of the market. Summary of the invention

[0004] In order to solve the high efficiency problem of refrigeration equipment, the present invention provides a speed control method and control system of a compressor.

[0005] Embodiment 1, the present invention provides a method for controlling the speed of a compressor, comprising:

[0006] Obtaining an operating mode of a controller of the compressor;

[0007] If the operation mode is the position mode, the location, current position altitude and current ambient temperature of the compressor are obtained;

[0008] According to the location and the current location height, a corresponding location speed table is obtained; wherein different locations and location heights correspond to different location speed tables, and each location speed table includes a first maximum speed V1max and a first target speed V1t corresponding to different temperatures;

[0009] In the position speed table corresponding to the position and the current position height, searching for the first maximum speed V1max and the first target speed V1t corresponding to the current ambient temperature;

[0010] The compressor is controlled to operate at the found first maximum speed V1max, and when the current ambient temperature of the compressor reaches a preset target temperature, the compressor is controlled to operate at the found first target speed V1t.

[0011] Furthermore, an embodiment of the present invention provides a speed control system for a compressor, comprising:

[0012] A first acquisition module M1, used to acquire the operation mode of the controller of the compressor;

[0013] A second acquisition module M2 is used to acquire the location, current location height and current ambient temperature of the compressor if the operation mode is the location mode;

[0014] A third acquisition module M3 is used to acquire a corresponding position speed table Wzb according to the position and the current position height; wherein different positions and position heights correspond to different position speed tables Wzb, and each position speed table includes a first maximum speed V1max and a first target speed V1t corresponding to different temperatures;

[0015] A first search module C1 is used to search a first maximum speed and a first target speed corresponding to the current ambient temperature in a position speed table corresponding to the position and the current position height;

[0016] The first control module K1 is used to control the compressor to operate at the found first maximum speed V1max, and when the current ambient temperature of the compressor reaches a preset target temperature, control the compressor to operate at the found first target speed V1t.

[0017] Further, a speed control system of a compressor, the control system comprises: a controller, a compressor and a processor, wherein the controller is an intelligent controller;

[0018] The compressor is a variable frequency compressor;

[0019] The at least one processor is used to call the machine-readable program, and is used to call the controller-readable program to execute the speed control method.

[0020] Furthermore, a speed control system of a compressor is provided, the control system comprising: a controller, a compressor and a processor, wherein the controller is an intelligent controller; the compressor is a variable frequency compressor;

[0021] The at least one processor is configured to call the machine-readable program to execute the method according to any one of claims 8 to 9.

[0022] The control method and control system of the compressor provided by the embodiment of the present invention, in the position mode, determines the corresponding position speed table according to the position of the compressor and the current position height, searches the first maximum speed and the first target speed corresponding to the current ambient temperature in the position speed table, and then controls the compressor to operate at the first maximum speed. When the ambient temperature reaches the preset target temperature, the compressor is controlled to operate at the first target speed. It can be seen that in the temperature adjustment stage, operating at the first maximum speed can make the ambient temperature quickly adjusted from the initial temperature to the preset target temperature. When the ambient temperature reaches the preset target temperature, controlling the compressor to operate at the first target speed can make the compressor run smoothly. In this process, different positions and position heights correspond to different position speed tables, so that the speed control of the compressor is more in line with the actual usage scenario, and efficient and energy-saving speed control is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a flow chart of a method for controlling the speed of a compressor in a position mode in one embodiment of the present invention;

[0024] Figure 2 It is a flow chart of a method for controlling the speed of a compressor in a position mode in another embodiment of the present invention;

[0025] Figure 3 is a system framework diagram of an embodiment of the present invention;

[0026] Figure 4 is a structural block diagram of a speed control system of a compressor in one embodiment of the present invention;

[0027] Figure 5 It is the position tachometer;

[0028] Figure 6 Schematic diagram of the relationship between target temperature and position speed; DETAILED DESCRIPTION

[0029] In order to solve the problem of controlling refrigeration equipment in accordance with local conditions and achieving high efficiency and energy saving, an embodiment of the present invention provides a method for controlling the speed of a compressor.

[0030] It is understandable that a control formula for the compressor is n=60f(1-s) / p, where n represents the speed of the compressor, f represents the power supply frequency of the compressor, s represents the slip rate, and p represents the number of motor pole pairs. From this formula, it can be seen that changing the power supply frequency f of the compressor can control the speed of the compressor. When p and s remain unchanged, the speed of the compressor will change with the change of frequency.

[0031] The present invention modifies the original control formula by position and position height, and the corrected position speed control formula is Wz=F(n,W,Wg,T), wherein W is the position, Wg is the position height, and T is the target temperature.

[0032] Under certain working conditions, the refrigerant mass flow rate is related to the compressor operating frequency. The higher the frequency, the higher the speed, the greater the flow rate, and generally, the faster the refrigeration speed.

[0033] See also Figure 1 The method provided in the embodiment of the present invention includes the following steps S11 to S15:

[0034] S11, obtaining an operating mode of a controller of the compressor;

[0035] Among them, the embodiment of the present invention provides two operation modes: position mode and non-position mode.

[0036] The so-called location mode refers to the different geographical locations of the city W (for example, Mianyang High-tech Zone, Fucheng District, Economic Development Zone, Youxian District, Yanting County, Jiangyou City, etc.), location height Wg (the height of the location, the altitude of the three-dimensional coordinates or spatial coordinates, such as the altitude of Zhengzhou, the altitude of Shigatse, etc.), the ambient temperature (or the target temperature) and the different location speed tables (see Figure 5 The position speed table shown in the figure corresponds to the position speed table, and in the position speed table, different temperatures are matched with the maximum speed and the target speed according to the experimental rules, so as to obtain the position speed data. The mode of speed control based on the position speed data is the position mode. In order to distinguish them, the maximum speed in the position mode is the first maximum speed, and the target speed is the first target speed.

[0037] The so-called non-position mode is a normal operation mode. The maximum rotation speed in the non-position mode is the second maximum rotation speed, and the target rotation speed is the second target rotation speed.

[0038] Among them, the method provided by the embodiment of the present invention can be executed by a cloud platform (or cloud end).

[0039] S12. If the operation mode is the position mode, obtaining the location, current location height and current ambient temperature of the compressor;

[0040] That is, if the current operation mode of the controller is the position mode, the location of the compressor is obtained, such as the regional location, such as Mianyang High-tech Zone, Fucheng District, Economic Development Zone, Youxian District, Yanting County, Jiangyou City, etc.). At the same time, the ambient temperature of the compressor is also obtained, and the temperature information can be obtained from the drive board of the compressor. At the same time, the height information of the location of the compressor is also obtained, the location height Wg (the height of the location, the altitude of the three-dimensional coordinates or the spatial coordinates, such as the altitude of Zhengzhou, the altitude of Shigatse, etc.). The drive board of the compressor can be connected to the corresponding temperature and position sensors, obtain temperature information from the temperature sensor, and obtain position information from the position sensor.

[0041] S13, acquiring a corresponding position speed table according to the current position and the current position altitude; wherein different positions and position altitudes correspond to different position speed tables, and each position speed table includes a first maximum speed and a first target speed corresponding to different temperatures;

[0042] That is, different location tachometers are used for different regional geographical locations and different location altitudes. Therefore, the corresponding location tachometer is determined here according to the location of the compressor and the current ambient temperature.

[0043] S14, searching a first maximum speed and a first target speed corresponding to the current ambient temperature in a position speed table corresponding to the position and the current position height;

[0044] That is, in the position speed table determined in S13, the first maximum speed and the first target speed corresponding to the current ambient temperature are searched.

[0045] S15: Control the compressor to operate at the first maximum speed found, and when the current ambient temperature of the compressor reaches a preset target temperature, control the compressor to operate at the first target speed found.

[0046] That is, the compressor is first controlled to run at the first maximum speed. During the operation, the temperature of the environment where the compressor is located keeps changing. When the temperature reaches the preset target temperature, the compressor is controlled to run at the first target speed. The preset target temperature is the temperature set by the user. For example, when cooling, the user sets the target temperature to 26°. The temperature in the refrigerator is 5 degrees, or the refrigeration temperature is minus 16 degrees.

[0047] Furthermore, the position sensor can be used to obtain the three-dimensional coordinates (a, b, z) of the area to obtain the height z or g of the refrigeration equipment compressor at the location. Alternatively, the geographical location information of the national location database can be used in combination with the building information to obtain the specific location information of each compressor, including the height information z or g, such as (a, b, z) in Chengdu. The (a, b, z) can correspond to a specific temperature t, and a new array (ai, bi, zi, ti) can be output, where i is a positive number greater than 1, and can be any positive integer N as needed.

[0048] Wherein, the (a, b) is a plane coordinate of a certain area, such as a region, such as (a, b) of Chengdu, and the (a, b) can correspond to a specific temperature t and humidity s, and output a new array (ai, bi, ti, si), and i is a positive number greater than 1, and can be any positive integer N as needed. At the same time, the operating parameters of the refrigeration equipment, such as the air conditioner, are determined according to the relative humidity value.

[0049] The control system also includes a voice device, which can use the three-dimensional coordinates (a, b, z) of the compressor of the cloud refrigeration equipment to obtain the three-dimensional position of the compressor and broadcast it to the mobile terminal or the manufacturer.

[0050] A better solution is to obtain the plane coordinates of a cloud compressor at a certain height of a place, which can be the altitude or the relative height of a certain area. The (a, b, z) is the three-dimensional space coordinates (three-dimensional coordinates) of a certain area, such as a region, such as the (a, b, z) of Chengdu. The (a, b, z) can correspond to a specific temperature t and humidity s, and output a new array (ai, bi, zi, ti, si), and i is a positive number greater than 1, and can be any positive integer N as needed.

[0051] A better solution is to obtain the three-dimensional coordinates of the cloud refrigeration equipment compressor at a certain height in a place. The (a, b, z) is the three-dimensional coordinates of a certain area, such as a region, such as the (a, b, z) of Chengdu. The (a, b, z) can correspond to a specific temperature t and humidity s, and output a new array (ai, bi, zi, ti, si), and i is a positive integer greater than 1, which can be a large number N as needed.

[0052] The parameters in the controller can be initialized. The parameters stored in the controller may include: the above-mentioned first duration, the position tachometer corresponding to different positions and ambient temperatures, the non-position model corresponding to different positions and temperatures, the second duration, the third duration and other data. The default operating mode in the controller is the position mode. Of course, the compressor device can receive the user's settings. For example, if the user switches the operating mode to the non-position mode, the operating mode stored in the controller is the non-position mode.

[0053] For example, the operation mode stored in the controller is the position mode, and the first duration is 3 minutes, 6 minutes, or 10 minutes, etc. Of course, 3 can also be a different duration, such as 3, 2, 1, etc. minutes. Then the position speed control process may include the following steps:

[0054] First, obtain the location, current location altitude, and current ambient temperature from the controller. The controller can specifically obtain this information from the compressor drive board. Among them, the location is Mianyang, and the current location altitude is 400 meters relative to the altitude above sea level, or it can be 600 meters. There is still a difference of 200 meters in the height of each location. The altitude of a certain place exceeds 3,000 meters, and the position speed of the compressor will be different, and there will be a certain gap. The current ambient temperature is 25 degrees Celsius and the target temperature is 18 degrees. Of course, the ambient temperature can be roughly consistent with the target temperature. For example, when the ambient temperature obtained is the refrigeration temperature inside the refrigerator, the ambient temperature is 5 degrees, which will be roughly consistent with the target temperature of 3 degrees.

[0055] Then, according to the current position and the current position height, the corresponding position speed table is determined, and then the maximum speed and the target speed corresponding to the current ambient temperature are found from the position speed table, that is, the first maximum speed and the first target speed;

[0056] Next, the controller sends a control instruction to the driving board, so that the compressor runs at a first maximum speed;

[0057] Finally, the current ambient temperature is obtained every 1 minute, and then it is determined whether the current ambient temperature drops to the preset target temperature of 18 degrees Celsius. After determination, it is found that the current ambient temperature is higher than the preset target temperature in the first 3 minutes, so the compressor is still controlled to run at the first maximum speed. When the current ambient temperature is equal to the preset target temperature in the second 2 minutes, the compressor is controlled to run at the target speed, so that the compressor runs smoothly at the first target speed at the preset target temperature until the compressor speed control process ends.

[0058] In one embodiment, when the current ambient temperature of the compressor reaches a preset target temperature, controlling the compressor to operate at the found first target speed in S15 may specifically include the following steps:

[0059] S151, obtaining the current ambient temperature of the compressor at a first time interval, and determining whether the current ambient temperature reaches the preset target temperature;

[0060] S152: If yes, control the compressor to operate at the first target speed found;

[0061] S153, otherwise, control the compressor to run at the first maximum speed found, and return to the step of "obtaining the current ambient temperature of the compressor every first time period".

[0062] Among them, the first duration is a fixed or variable value, and the current ambient temperature is detected once every period of time to determine whether the current ambient temperature reaches the preset target temperature. If the preset target temperature is reached, the compressor is controlled to run at the first target speed. If the preset target temperature is not reached, it still runs at the first maximum speed, and then returns to S151. After multiple cycles, when the ambient temperature is the preset target temperature, the compressor can be controlled to run at the first target speed, so that it can run smoothly at the temperature required by the user.

[0063] It is understandable that, in the position mode, the corresponding position speed table is determined according to the location of the compressor and the current position height, the first maximum speed and the first target speed corresponding to the current ambient temperature are searched in the position speed table, and then the compressor is controlled to run at the first maximum speed. When the ambient temperature reaches the preset target temperature, the compressor is controlled to run at the first target speed. It can be seen that in the temperature adjustment stage, running at the first maximum speed can quickly adjust the ambient temperature from the initial temperature to the preset target temperature. When the ambient temperature reaches the preset target temperature, controlling the compressor to run at the first target speed can make the compressor run smoothly. In this process, different positions and humidities correspond to different position speed tables. It can be seen that the considerations of the above-mentioned first maximum speed and first target speed include position, height, and temperature, that is, the regional environmental factors are taken into account, so that the speed control of the compressor is more in line with the actual usage scenario and realizes personalized speed control.

[0064] In another embodiment, the method provided by the embodiment of the invention may further include:

[0065] Determine the time taken to adjust the ambient temperature of the compressor from the initial temperature to the preset target temperature, and send the time taken to the cloud so that the cloud can adjust the configuration parameters in the location mode according to the time taken.

[0066] That is to say, the time it takes for the ambient temperature of the compressor to change from the initial temperature to the preset target temperature is recorded, which can also be called the adjustment time. The time is sent to the cloud so that the cloud can adjust the parameters, the second time, and the third time in the intelligent model.

[0067] In an example, if the operating mode obtained from the controller is the position mode, the specific speed control process may include the following steps:

[0068] First, obtain relevant information, for example, the preset target temperature is 26 degrees Celsius, the current ambient temperature is 35 degrees Celsius, and the location is Mianyang.

[0069] Then, the location model, the second duration and the third duration corresponding to Building 6, Floor 6, 21st Century Garden, Mianyang High-tech Zone, a location height of 436 meters and 26 degrees Celsius are selected. The second duration is 3 minutes, and the third duration is 20 seconds, 10 seconds, 2 seconds, 1 second, or 500 milliseconds, 100 milliseconds. The second duration can be called the standard duration, and the third duration can be called the precise duration.

[0070] Next, the current ambient temperature and position are input into the position model to obtain the second maximum speed and the second target speed; the compressor is controlled to run at the second maximum speed; when the running time reaches the second time length of 3 minutes, the current ambient temperature is detected to determine whether the current ambient temperature has dropped to 26 degrees Celsius. After judgment, it is found that the current ambient temperature is higher than 26 degrees Celsius, so the ambient temperature is detected every 10 seconds or 1 second, and it is determined whether the detected ambient temperature has reached 26 degrees Celsius. At the Nth 500 milliseconds, the ambient temperature reaches 26 degrees Celsius.

[0071] It is understandable that the benefits of position speed control in position mode are:

[0072] 1. Through position and height, the compressor can be started and operated in a more energy-saving way when the temperature is controlled, which is more in line with the local location and environment and can achieve energy saving of the compressor.

[0073] Yet another embodiment provides a position and speed control system for a compressor.

[0074] See also Figure 4 , the device comprises the following steps:

[0075] A first acquisition module, used to acquire an operation mode of a controller of the compressor;

[0076] A second acquisition module, for acquiring the location, current location height and current ambient temperature of the compressor if the operation mode is the location mode;

[0077] A third acquisition module is used to acquire a corresponding position speed table according to the position and the current position height; wherein different positions and position heights correspond to different position speed tables, and each position speed table includes a first maximum speed and a first target speed corresponding to different temperatures;

[0078] A first search module is used to search a first maximum speed and a first target speed corresponding to the current ambient temperature in a position speed table corresponding to the position and the current position height;

[0079] The first control module is used to control the compressor to operate at the first maximum speed found, and when the current ambient temperature of the compressor reaches a preset target temperature, control the compressor to operate at the first target speed found.

[0080] In one embodiment, the first control module includes:

[0081] A first judgment unit, configured to obtain the current ambient temperature of the compressor at a first time interval, and judge whether the current ambient temperature reaches the preset target temperature;

[0082] a first control unit, configured to control the compressor to operate at the first target speed found if a preset target temperature is reached;

[0083] The second control unit is used to control the compressor to operate at the first maximum speed found if the preset target temperature is not reached, and return to the first judgment unit.

[0084] Furthermore, the cloud 3 stores an ambient temperature module 31, a position module 32, and a position height module 33, which work together to output the position speed value to the compressor. The compressor is electrically connected to the WiFi module 1, and the WiFi module 1 is connected to the cloud 3 through the transmission channel 2, and the compressor 5 is connected to the drive circuit 4; the drive circuit 4 is electrically connected to the WiFi module 1 and exchanges data.

[0085] Furthermore, the ambient temperature module 31, the position module 32, and the position height module 33 can be directly electrically connected to the compressor 5 and exchange data with each other.

Claims

1. A method for controlling the speed of a compressor, characterized in that: The method comprises: Obtaining an operating mode of a controller of the compressor; If the operation mode is the position mode, the location, current position altitude and current ambient temperature of the compressor are obtained; According to the location and the current location altitude, a corresponding location speed table is obtained; wherein different locations and location altitudes correspond to different location speed tables, and each location speed table includes a first maximum speed and a first target speed corresponding to different temperatures; In the position speed table corresponding to the position and the current position height, searching for the first maximum speed V1max and the first target speed V1t corresponding to the current ambient temperature; The compressor is controlled to operate at the first maximum speed found, and when the current ambient temperature of the compressor reaches a preset target temperature, the compressor is controlled to operate at the first target speed found.

2. The speed control method according to claim 1, characterized in that: When the current ambient temperature of the compressor reaches a preset target temperature, controlling the compressor to operate at the found first target speed V1t includes: Obtaining the current ambient temperature of the compressor every first time period T1c, and determining whether the current ambient temperature reaches the preset target temperature; If yes, the compressor is controlled to operate at the first target speed found; Otherwise, the compressor is controlled to run at the first maximum speed found, and the process returns to the step of "obtaining the current ambient temperature of the compressor every first time period T1c".

3. The compressor speed control method according to claim 1, characterized in that: Also includes: If the operation mode is the position mode, the position and current ambient temperature of the compressor are obtained, and a corresponding position model and a second duration are determined according to the position and the current ambient temperature; wherein the position model is used to output a corresponding second maximum speed and a second target speed according to the position and the current ambient temperature of the compressor; Inputting the current ambient temperature into the position model to obtain a corresponding second maximum speed, and controlling the compressor to operate at the second maximum speed; When the compressor runs at the second maximum speed for a period of time that reaches the second period of time, obtaining the current ambient temperature of the compressor, and determining whether the current ambient temperature reaches a preset target temperature; If the current ambient temperature reaches the preset target temperature, the preset target temperature is input into the position model to obtain a corresponding second target speed, and the compressor is controlled to operate at the second target speed.

4. The compressor speed control method according to claim 3, characterized in that: When determining the corresponding position model and the second duration according to the location and the current ambient temperature, the method further includes: determining the corresponding third duration according to the location and the current ambient temperature; Correspondingly, the method further includes: After controlling the compressor to operate at the second target speed, the operating speed of the compressor is adjusted every the third time period, and the speed adjustment process includes: obtaining the current ambient temperature of the compressor, inputting the current ambient temperature into the position model, obtaining the corresponding second target speed, and controlling the compressor to operate at the second target speed.

5. The compressor speed control method according to claim 3, characterized in that: Also includes: Determine the time taken to adjust the ambient temperature of the compressor from the initial temperature to the preset target temperature, and send the time taken to the cloud so that the cloud can adjust the configuration parameters in the location mode according to the time taken.

6. The compressor speed control method according to any one of claims 4 or 5, characterized in that: The third duration T3c is shorter than the second duration T2c.

7. A speed control system for a compressor, characterized in that: A first acquisition module, used to acquire an operation mode of a controller of the compressor; A second acquisition module, for acquiring the location, current location height and current ambient temperature of the compressor if the operation mode is the location mode; A third acquisition module is used to acquire a corresponding position speed table according to the position and the current position height; wherein different positions and position heights correspond to different position speed tables, and each position speed table includes a first maximum speed and a first target speed corresponding to different temperatures; A first search module, used for searching a first maximum speed and a first target speed corresponding to the current ambient temperature in a position speed table corresponding to the position and the current position height; The first control module is used to control the compressor to operate at the first maximum speed found, and when the current ambient temperature of the compressor reaches a preset target temperature, control the compressor to operate at the first target speed found.

8. A speed control system for a compressor, characterized in that: The control system comprises: a controller, a compressor and a processor, wherein the controller is an intelligent controller; The compressor is a variable frequency compressor; The at least one processor is configured to call the machine-readable program to execute the method according to any one of claims 1 to 7.

9. A speed control system for a compressor, characterized in that: The control system comprises: a controller, a compressor and a processor, wherein the controller is an intelligent controller; The compressor is a variable frequency compressor; The at least one processor is configured to call the machine-readable program to execute the method according to any one of claims 8 to 9.

10. A compressor speed control system according to any one of claims 7 to 8 to 9 or 10, characterized in that: include: Cloud 3, compressor 5, drive circuit 4, WiFi module 1, transmission channel 2, wherein cloud 3 stores ambient temperature module 31, position module 32, position height module 33, which work together to output position speed value to compressor; compressor is electrically connected to WiFi module 1, WiFi module 1 is connected to cloud 3, compressor 5 and drive circuit 4 through transmission channel 2; The driving circuit 4 is electrically connected to the WiFi module 1 and exchanges data.

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