Refrigerator, variable frequency compressor system and control method thereof

Abstract

The present invention discloses a refrigerator, a variable frequency compressor system, and a control method thereof. After the variable frequency compressor is powered on, within the first N on-off cycles, the operating parameters corresponding to the current number of on-off cycles at the current ambient temperature are obtained based on the correspondence between the preset number of on-off cycles, the ambient temperature, and the operating parameters of the variable frequency compressor, thereby obtaining target operating parameters. After N on-off cycles, an operating parameter adjustment value is determined based on the ambient temperature and the return air pipe temperature of the variable frequency compressor at the end of the previous on-off cycle, and the target operating parameters are calculated based on the operating parameter adjustment value and the operating parameters of the previous on-off cycle of the variable frequency compressor. In the current on-off cycle, the variable frequency compressor is controlled to operate at the corresponding target operating parameters when it starts operating. The present invention can effectively adjust the frequency of the variable frequency compressor so that the compressor achieves better working efficiency and improves the user experience.

Description

Technical Field

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

[0002] Refrigerators equipped with inverter compressors have gained widespread recognition due to their energy-saving and low-noise advantages. Inverter compressors can achieve optimal operating efficiency through stepless speed adjustment, ensuring optimal compressor operation.

[0003] The temperature of the compressor's return air pipe can reflect the cooling efficiency of the entire refrigeration system. However, the inventors have discovered that the existing technology has at least the following problems: the existing frequency adjustment strategy for variable-frequency compressors fails to comprehensively consider the relationship between the compressor's return air temperature and the compressor's operating status, making it difficult to achieve optimal compressor efficiency. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a refrigerator, a variable frequency compressor system and a control method thereof, which can effectively adjust the frequency of the variable frequency compressor so that the compressor achieves better working efficiency and improves the user experience.

[0005] To achieve the above object, an embodiment of the present invention provides a refrigerator, comprising:

[0006] The refrigerator body is equipped with a variable frequency compressor;

[0007] An ambient temperature sensor, used to detect the current ambient temperature of the refrigerator;

[0008] A return air pipe temperature sensor is provided on the return air pipe of the variable frequency compressor and is used to detect the current return air pipe temperature of the variable frequency compressor;

[0009] A frequency conversion controller is connected to the frequency conversion compressor, the ambient temperature sensor, and the return air pipe temperature sensor, and is used to:

[0010] After the variable frequency compressor is powered on, in response to a preset operating parameter control instruction, determining the current number of on-off cycles of the variable frequency compressor;

[0011] If the current on-off cycle is within the first N on-off cycles after the variable frequency compressor is powered on, the operating parameters corresponding to the current number of on-off cycles at the current ambient temperature are obtained according to the correspondence between the preset number of on-off cycles, the ambient temperature and the operating parameters of the variable frequency compressor, and the target operating parameters are obtained;

[0012] If the current on-off cycle is after N on-off cycles after the variable frequency compressor is powered on, an operating parameter adjustment value is determined based on the ambient temperature and the return air pipe temperature of the variable frequency compressor at the end of the previous on-off cycle, and a target operating parameter is calculated based on the operating parameter adjustment value and the operating parameters of the variable frequency compressor in the previous on-off cycle;

[0013] In the current on-off cycle, the variable frequency compressor is controlled to operate with the corresponding target operating parameters when starting operation.

[0014] As a preferred embodiment, determining the operating parameter adjustment value based on the ambient temperature and the return air pipe temperature of the variable frequency compressor at the end of the previous start-stop cycle specifically includes:

[0015] Calculate the difference between the ambient temperature and the return air pipe temperature at the end of the previous start-stop cycle of the variable frequency compressor as the current temperature difference;

[0016] According to the preset correspondence between the temperature difference and the operating parameter adjustment value, the operating parameter adjustment value corresponding to the current temperature difference is obtained.

[0017] As a preferred embodiment, the target operating parameter is calculated based on the operating parameter adjustment value and the operating parameter of the previous on-off cycle of the variable frequency compressor, specifically:

[0018] The target operating parameter is obtained by adding the operating parameter adjustment value to the value of the operating parameter of the previous on-off cycle of the variable frequency compressor.

[0019] As a preferred embodiment, the operating parameters include an operating frequency and an operating speed, and the operating parameter adjustment values include an operating frequency adjustment value and an operating speed adjustment value.

[0020] As a preferred embodiment, before controlling the variable frequency compressor to operate with the target operating parameters when starting operation, the variable frequency controller is further configured to:

[0021] Determining whether the target operating parameter is within a preset operating parameter limit range;

[0022] When the target operating parameter is greater than the upper limit of the preset operating parameter limit range, updating the target operating parameter to the upper limit of the preset operating parameter limit range;

[0023] When the target operating parameter is less than the lower limit of the preset operating parameter limit range, the target operating parameter is updated to the lower limit of the preset operating parameter limit range.

[0024] As a preferred embodiment, the preset operating parameter limit range includes an operating frequency limit range and an operating speed limit range;

[0025] The operating frequency limit range is specifically: [40Hz, 140Hz];

[0026] The operating speed limit range is specifically: [1200RPM, 4200RPM].

[0027] As a preferred embodiment, the refrigerator further includes:

[0028] A start-stop controller connected to the frequency conversion controller, configured to send a frequency conversion compressor start signal to the frequency conversion controller when a preset start condition is met, and to send a frequency conversion compressor stop signal to the frequency conversion controller when a preset stop condition is met;

[0029] The variable frequency controller is further configured to: control the variable frequency compressor to start running according to the variable frequency compressor start signal; and control the variable frequency compressor to stop running according to the variable frequency compressor stop signal.

[0030] As a preferred embodiment, the start-stop controller is a temperature controller; the temperature controller is closed when the preset start temperature is reached, thereby sending the variable frequency compressor start signal, and is disconnected when the preset stop temperature is reached, thereby sending the variable frequency compressor stop signal.

[0031] An embodiment of the present invention further provides a variable frequency compressor system, comprising:

[0032] Inverter compressor;

[0033] An ambient temperature sensor, used to detect the ambient temperature of the variable frequency compressor;

[0034] A return air pipe temperature sensor is provided on the return air pipe of the variable frequency compressor and is used to detect the current return air pipe temperature of the variable frequency compressor;

[0035] A frequency conversion controller is connected to the frequency conversion compressor, the ambient temperature sensor, and the return air pipe temperature sensor, and is used to:

[0036] After the variable frequency compressor is powered on, in response to a preset operating parameter control instruction, determining the current number of on-off cycles of the variable frequency compressor;

[0037] If the current on-off cycle is within the first N on-off cycles after the variable frequency compressor is powered on, the operating parameters corresponding to the current number of on-off cycles at the current ambient temperature are obtained according to the correspondence between the preset number of on-off cycles, the ambient temperature and the operating parameters of the variable frequency compressor, and the target operating parameters are obtained;

[0038] If the current on-off cycle is after N on-off cycles after the variable frequency compressor is powered on, an operating parameter adjustment value is determined based on the ambient temperature and the return air pipe temperature of the variable frequency compressor at the end of the previous on-off cycle, and a target operating parameter is calculated based on the operating parameter adjustment value and the operating parameters of the variable frequency compressor in the previous on-off cycle;

[0039] In the current on-off cycle, the variable frequency compressor is controlled to operate with the corresponding target operating parameters when starting operation.

[0040] An embodiment of the present invention further provides a control method for a variable frequency compressor system, comprising:

[0041] Real-time detection of the ambient temperature of the variable frequency compressor and the return air pipe temperature of the variable frequency compressor;

[0042] After the variable frequency compressor is powered on, in response to a preset operating parameter control instruction, determining the current number of on-off cycles of the variable frequency compressor;

[0043] If the current on-off cycle is within the first N on-off cycles after the variable frequency compressor is powered on, the operating parameters corresponding to the current number of on-off cycles at the current ambient temperature are obtained according to the correspondence between the preset number of on-off cycles, the ambient temperature and the operating parameters of the variable frequency compressor, and the target operating parameters are obtained;

[0044] If the current on-off cycle is after N on-off cycles after the variable frequency compressor is powered on, an operating parameter adjustment value is determined based on the ambient temperature and the return air pipe temperature of the variable frequency compressor at the end of the previous on-off cycle, and a target operating parameter is calculated based on the operating parameter adjustment value and the operating parameters of the variable frequency compressor in the previous on-off cycle;

[0045] In the current on-off cycle, the variable frequency compressor is controlled to operate with the corresponding target operating parameters when starting operation.

[0046] Compared with the prior art, the refrigerator, variable frequency compressor system and control method thereof disclosed in the embodiment of the present invention detect the current ambient temperature of the refrigerator and the return air pipe temperature of the variable frequency compressor. After the variable frequency compressor is powered on, within the first N start-stop cycles, the operating parameters of the variable frequency compressor are determined according to the current ambient temperature and the number of start-stop cycles of the variable frequency compressor, and the variable frequency compressor is controlled to operate with corresponding preset constant operating parameters during startup, thereby promoting the variable frequency compressor to achieve better working efficiency and enabling the variable frequency compressor to enter a stable operating state more quickly; after N start-stop cycles, the operating parameter adjustment value of the variable frequency compressor is determined according to the ambient temperature and the return air pipe temperature, and the frequency of the variable frequency compressor is adjusted so that the variable frequency compressor can quickly achieve better working efficiency during the entire operation process, thereby providing users with a good user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a structural diagram of a refrigerator provided by one embodiment of the present invention;

[0048] Figure 2 Schematic diagram of the working process executed by the frequency conversion controller in an embodiment of the present invention;

[0049] Figure 3 Schematic diagram of the connection between the start-stop controller and the frequency conversion controller in an embodiment of the present invention;

[0050] Figure 4 1 is a schematic diagram of the control timing of the variable frequency compressor according to an embodiment of the present invention;

[0051] Figure 5 1 is a structural diagram of a variable frequency compressor system provided by one embodiment of the present invention;

[0052] Figure 6 It is a flow chart of a control method of a variable frequency compressor system provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0053] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0054] See also Figure 1 , is a schematic structural diagram of a refrigerator provided by an embodiment of the present invention. The present invention provides a refrigerator 10 , comprising: a refrigerator body 11 , a variable frequency compressor 12 , an ambient temperature sensor 13 , a return air pipe temperature sensor 14 , and a variable frequency controller 15 .

[0055] The variable frequency controller 15 is connected to the variable frequency compressor 12, the ambient temperature sensor 13, and the return air pipe temperature sensor 14. The variable frequency compressor 12 and the variable frequency controller 15 are installed in the refrigerator body 11. The ambient temperature sensor 13 is installed outside the refrigerator body 11 and is used to detect the current ambient temperature of the refrigerator 10 and send it to the variable frequency controller 15. The return air pipe temperature sensor 14 is installed on the return air pipe of the variable frequency compressor 12 and is used to detect the current return air pipe temperature of the variable frequency compressor 12.

[0056] See also Figure 2 , is a schematic diagram of the workflow executed by the frequency conversion controller in an embodiment of the present invention. The frequency conversion controller 15 is used to execute steps S11 to S14:

[0057] S11. After the variable frequency compressor is powered on, in response to a preset operating parameter control instruction, determining the current number of on-off cycles of the variable frequency compressor;

[0058] S12. If the current on-off cycle is within the first N on-off cycles after the variable frequency compressor is powered on, obtain the operating parameters corresponding to the current number of on-off cycles at the current ambient temperature based on the correspondence between the preset number of on-off cycles, the ambient temperature, and the operating parameters of the variable frequency compressor, and obtain the target operating parameters;

[0059] S13. If the current on-off cycle is after N on-off cycles after the variable frequency compressor is powered on, determine an operating parameter adjustment value based on the ambient temperature and the return air pipe temperature of the variable frequency compressor at the end of the previous on-off cycle, and calculate a target operating parameter based on the operating parameter adjustment value and the operating parameters of the variable frequency compressor in the previous on-off cycle;

[0060] S14. In the current on-off cycle, the variable frequency compressor is controlled to operate with the corresponding target operating parameters when starting operation.

[0061] After the variable frequency compressor is powered on, corresponding start-up conditions or stop conditions are pre-set to trigger the variable frequency controller 15 to control the variable frequency compressor 12 to start when it is determined that the start-up conditions are currently met, that is, to start running, and to control the variable frequency compressor 12 to stop when the stop conditions are met, that is, to stop running. Thereafter, when the start-up conditions are currently met again, the variable frequency compressor 12 is controlled to start running again, and this cycle is repeated.

[0062] It should be noted that the on-off cycle of the variable frequency compressor refers to the sum of the on-time and off-time of the variable frequency compressor, that is, the duration from the moment the variable frequency compressor is turned on to the moment it is turned on again. It is understood that in this embodiment of the present invention, the on-time and off-time of different on-off cycles are not necessarily equal.

[0063] In an embodiment of the present invention, after the variable frequency compressor is powered on, the variable frequency controller 15 responds to preset operating parameter control instructions to control the variable frequency compressor 12 to operate according to certain operating parameters during startup in each on / off cycle. The operating parameters corresponding to different on / off cycles are not necessarily the same.

[0064] Specifically, during the control process of the operating parameters of each on-off cycle, the frequency conversion controller 15 determines the on-off cycle number of the frequency conversion compressor 12 after power-on, that is, determines the number of the current on-off cycle.

[0065] In one case, if the current number of start-stop cycles is less than or equal to the preset number N, that is, the current start-stop cycle is within the first N start-stop cycles after the variable frequency compressor is powered on, at this time, the variable frequency compressor is not yet in a stable operation state, and its operating parameters are determined according to the current ambient temperature of the refrigerator, and are pre-set. When the ambient temperature is determined, the corresponding operating parameters are constant values.

[0066] The correspondence between the number of on / off cycles, the ambient temperature, and the operating parameters of the variable frequency compressor is preset and stored in the internal memory of the variable frequency controller 15 for easy access by the variable frequency controller 15. Different control operations are performed according to different ambient temperatures and the number of on / off cycles.

[0067] During use, the variable frequency controller 15 obtains the current refrigerator ambient temperature te from the ambient temperature sensor 13 in real time and determines the current number of on-off cycles. Based on the correspondence between the number of on-off cycles, the ambient temperature, and the operating parameters of the variable frequency compressor, the operating parameters corresponding to the current number of on-off cycles at the current ambient temperature te are obtained as the target operating parameters for the variable frequency compressor 12 in the current on-off cycle.

[0068] As an example, assuming that in the correspondence between the number of start-stop cycles, ambient temperature and the operating parameters of the variable frequency compressor, when the ambient temperature is T≥36°C, the operating parameter of the variable frequency compressor corresponding to the first start-stop cycle is A, and the operating parameter of the variable frequency compressor corresponding to the second start-stop cycle is B; when the ambient temperature is 36°C>T≥28°C, the operating parameter of the variable frequency compressor corresponding to the first start-stop cycle is C, and the operating parameter of the variable frequency compressor corresponding to the second start-stop cycle is D..., if the current number of start-stop cycles is 2 and the current ambient temperature is 32°C, the operating parameter D is obtained as the target operating parameter.

[0069] In another case, if the current number of start-stop cycles is greater than the preset number N, that is, the current start-stop cycle is after N start-stop cycles after the variable frequency compressor is powered on, at this time, the variable frequency compressor enters a stable operating state, and its operating parameter values need to be adaptively adjusted according to the ambient temperature te, the return air pipe temperature th of the variable frequency compressor and the current operating state.

[0070] The temperature of the return air pipe can reflect the cooling efficiency of the entire refrigeration system. The variable frequency controller 15 obtains the ambient temperature te and the return air pipe temperature th at the end of the previous on-off cycle of the variable frequency compressor 12. Based on the difference between the ambient temperature te and the return air pipe temperature th, it determines the operating parameter adjustment value of the variable frequency compressor. Then, based on the operating parameter adjustment value and the operating parameters of the variable frequency compressor in the previous on-off cycle, it calculates the target operating parameters of the variable frequency compressor 12 in the current on-off cycle.

[0071] As a preferred embodiment, in step S14, determining the operating parameter adjustment value based on the ambient temperature and the return air pipe temperature of the variable frequency compressor at the end of the previous start-stop cycle specifically includes:

[0072] Calculate the difference between the ambient temperature and the return air pipe temperature at the end of the previous start-stop cycle of the variable frequency compressor as the current temperature difference;

[0073] According to the preset correspondence between the temperature difference and the operating parameter adjustment value, the operating parameter adjustment value corresponding to the current temperature difference is obtained.

[0074] Preferably, in the correspondence between the preset temperature difference and the operating parameter adjustment value, the temperature difference and the operating parameter adjustment value are positively correlated.

[0075] In this embodiment of the present invention, the ambient temperature te and the return pipe temperature th are detected. Based on the difference Δt between the two, the operating parameters of the variable-frequency compressor are controlled differently to maintain the temperature difference within a specific range. When the difference between the ambient temperature and the return pipe temperature falls below the specific range, the compressor operating parameters are reduced. When the difference between the ambient temperature and the return pipe temperature exceeds the specific range, the compressor operating parameters are increased. The specific range of the temperature difference Δt is 1.8-2.2°C.

[0076] It should be noted that the target operating parameter is calculated based on the operating parameter adjustment value and the operating parameter of the previous on-off cycle of the variable frequency compressor. Specifically, the target operating parameter is obtained by adding the operating parameter adjustment value to the value of the operating parameter of the previous on-off cycle of the variable frequency compressor.

[0077] The operating parameter adjustment value can be a positive number or a negative number, or can be 0. Therefore, the adjustment result of the operating parameter of the previous start-stop cycle includes three situations: increasing the operating parameter, decreasing the operating parameter, or maintaining the operating parameter unchanged.

[0078] By adopting the technical means of the embodiment of the present invention, after the variable frequency compressor is powered on, the variable frequency controller determines the operating parameters of the variable frequency compressor according to the current ambient temperature and the number of the variable frequency compressor's on-off cycles within the first N on-off cycles, and controls the variable frequency compressor to operate with corresponding preset constant operating parameters during startup, thereby promoting the variable frequency compressor to achieve better working efficiency and enabling the variable frequency compressor to enter a stable operating state more quickly; after N on-off cycles, the operating parameter adjustment value of the variable frequency compressor is determined according to the ambient temperature and the return air pipe temperature, and the frequency of the variable frequency compressor is adjusted, so that the variable frequency compressor can quickly achieve better working efficiency during the entire operation process, thereby providing users with a good user experience.

[0079] As a preferred embodiment, see Figure 3 , is a schematic diagram of the connection between the start-stop controller and the frequency conversion controller in an embodiment of the present invention. Based on the above embodiment, the refrigerator 10 further includes a start-stop controller 16.

[0080] The start-stop controller 16 is connected to the frequency conversion controller 15. The start-stop controller 16 is used to:

[0081] When the preset start-up condition is met, a start-up signal of the variable frequency compressor is sent to the variable frequency controller 15, and when the preset stop condition is met, a stop signal of the variable frequency compressor is sent to the variable frequency controller 15;

[0082] The variable frequency controller 15 is further configured to: control the variable frequency compressor 12 to start running according to the variable frequency compressor start signal; and control the variable frequency compressor 12 to stop running according to the variable frequency compressor stop signal.

[0083] Preferably, the start-stop controller 16 is a temperature controller; the temperature controller is closed when a preset start temperature is reached, thereby sending a start signal for the variable frequency compressor, and is disconnected when a preset stop temperature is reached, thereby sending a stop signal for the variable frequency compressor.

[0084] Specifically, see Figure 3 One end of the temperature controller is connected to the power line, and the other end is connected to the control port P of the frequency conversion board of the frequency conversion controller. When the temperature controller is disconnected, the control port P of the frequency conversion board will receive a low-level signal, thereby obtaining the frequency conversion compressor shutdown signal; when the temperature controller is closed, the control port P of the frequency conversion board will receive a high-level signal, thereby obtaining the frequency conversion compressor start-up signal.

[0085] It should be noted that the frequency conversion controller 15 can determine the number of each start and stop cycle of the frequency conversion compressor based on the received frequency conversion compressor start signal and the frequency conversion compressor stop signal; or it can determine the number of each start and stop cycle of the frequency conversion compressor based on the start-up operation state and the stop operation state of the frequency conversion compressor, both of which do not affect the beneficial effects achieved by the present invention.

[0086] By adopting the technical means of the embodiment of the present invention, a temperature controller is used to realize the start and stop control of the variable frequency compressor, and the control logic is simple and effective.

[0087] As a preferred embodiment, the operating parameters include an operating frequency f (unit: Hz) and an operating speed r (unit: RPM).

[0088] The corresponding relationship between the preset number of on-off cycles, ambient temperature and the operating parameters of the variable frequency compressor is specifically: the corresponding relationship between the number of on-off cycles, ambient temperature and the operating frequency and operating speed of the variable frequency compressor.

[0089] Then, in step S14, in the current start-stop cycle, the variable frequency compressor is controlled to operate with the corresponding target operating parameters during startup operation, specifically: in the current start-stop cycle, the variable frequency compressor is controlled to operate with the corresponding target operating frequency and target operating speed during startup operation.

[0090] In an optional implementation, N=4 is set, and the correspondence between the preset number of on-off cycles, the ambient temperature, and the operating parameters of the variable frequency compressor applied in step S13 is specifically as described in Table 1:

[0091] Table 1

[0092]

[0093] Specifically, see Figure 4 , is a schematic diagram of the control timing of the variable frequency compressor in an embodiment of the present invention. After the refrigerator is powered on, the inverter board's control port P receives the variable frequency compressor start signal from the temperature controller. The inverter board then outputs a corresponding control signal to start the variable frequency compressor. During the first on-off cycle, regardless of the current ambient temperature te, the compressor first operates according to Section A, at an 80 Hz frequency and 2400 RPM, for 5 minutes. It then operates according to Section B, at a 140 Hz frequency and 4200 RPM, until the temperature controller reaches the preset shutdown temperature, at which point it disconnects and transmits a shutdown signal to the inverter board via control port P. The inverter board shuts down the variable frequency compressor, which is Section C1.

[0094] When the temperature controller reaches the startup temperature, it closes and sends a startup signal to the inverter board through control port P, requesting restart. During the second on-off cycle, the inverter compressor operates according to stage D1. The corresponding operating parameters are determined based on the current ambient temperature, te. For example, if the current ambient temperature, te, is 32°C, referring to Table 1, the operating frequency for the second on-off cycle is 120 Hz and the speed is 3600 RPM. This continues until the temperature controller is disconnected again. The inverter board then shuts down the inverter compressor, which is stage C2.

[0095] During the third and fourth on-off cycles, segments D2 and D3 also operate at the corresponding operating frequency and speed based on the current ambient temperature, te, until the temperature controller shuts down. Segments C3 and E are the time periods during which the corresponding inverter board controls the inverter compressor to shut down. The operating parameter adjustment logic for segments D2 and D3 is the same as for segment D1.

[0096] It can be understood that the operating frequency and operating speed of the above four variable frequency compressors are only related to the ambient temperature. When the ambient temperature is determined, the operating frequency and operating speed are preset to be constant. They will operate according to this rule when powered on for the first time. If the refrigerator is powered off during the process, the above rules will be followed when it is powered on again.

[0097] Furthermore, the operating parameter adjustment value includes an operating frequency adjustment value Δf and an operating speed adjustment value Δr. The correspondence between the preset temperature difference and the operating parameter adjustment value is specifically: a correspondence between the preset temperature difference and the operating frequency adjustment value Δf and the operating speed adjustment value Δr.

[0098] The specific corresponding relationship is:

[0099] When the temperature difference is △t≥3.7℃, the corresponding operating parameter adjustment values include: operating frequency value is +40Hz, operating speed adjustment value is +1200RPM;

[0100] When the temperature difference is 3.4℃<△t≤3.7℃, the corresponding operating parameter adjustment values include: operating frequency value +30Hz, operating speed adjustment value +900RPM;

[0101] When the temperature difference is 3.1℃<△t≤3.4℃, the corresponding operating parameter adjustment values include: operating frequency value +20Hz, operating speed adjustment value +600RPM;

[0102] The operating parameter adjustment values corresponding to the temperature difference of 2.8℃<△t≤3.1℃ include: operating frequency value +15Hz, operating speed adjustment value +450RPM;

[0103] When the temperature difference is 2.5℃<△t≤2.8℃, the corresponding operating parameter adjustment values include: operating frequency value +10Hz, operating speed adjustment value +300RPM;

[0104] The operating parameter adjustment values corresponding to the temperature difference of 2.2℃<△t≤2.5℃ include: operating frequency value +5Hz, operating speed adjustment value +150RPM;

[0105] The operating parameter adjustment values corresponding to the temperature difference of 1.8℃≤△t≤2.2℃ include: the operating frequency value is 0Hz, the operating speed adjustment value is 0RPM;

[0106] When the temperature difference is 1.5℃≤△t≤1.8℃, the corresponding operating parameter adjustment values include: operating frequency value is -5Hz, operating speed adjustment value is -150RPM;

[0107] The operating parameter adjustment values corresponding to the temperature difference of 1.2℃≤△t<1.5℃ include: operating frequency value of -10Hz, operating speed adjustment value of -300RPM;

[0108] The operating parameter adjustment values corresponding to the temperature difference of 0.9℃≤△t<1.2℃ include: operating frequency value of -15Hz, operating speed adjustment value of -450RPM;

[0109] The operating parameter adjustment values corresponding to the temperature difference of 0.6℃≤△t<0.9℃ include: operating frequency value of -20Hz, operating speed adjustment value of -600RPM;

[0110] The operating parameter adjustment values corresponding to the temperature difference of 0.3℃≤△t<0.6℃ include: operating frequency value of -30Hz, operating speed adjustment value of -900RPM;

[0111] The operating parameter adjustment values corresponding to the temperature difference of △t<0.3℃ include: the operating frequency value is -40Hz, and the operating speed adjustment value is -1200RPM.

[0112] The corresponding table is shown in Table 2:

[0113]

[0114] See also Figure 4 From the fifth start-stop cycle, that is, after stage E, when the variable frequency compressor is started again, it enters stage F1. From this start-stop cycle, the operating frequency and operating speed are no longer constant. The ambient temperature te and the return air pipe temperature th at the end of the previous start-stop cycle are required to participate in the control. According to the temperature difference between the two, the corresponding operating parameter adjustment value is determined to calculate the operating frequency and operating speed of this start-stop cycle.

[0115] For example, when the D3 segment of the previous start-stop cycle is operated at an operating frequency of 120Hz and a speed of 3600RPM, at the end of the previous start-stop cycle, that is, at the end of segment E, the ambient temperature te is 32℃, the return air pipe temperature th is 31.2℃, and the temperature difference △t is 0.8℃. According to Table 2, 0.6℃≤△t<0.9℃, the corresponding operating frequency adjustment value is -20Hz, and the operating speed adjustment value is -600RPM. Then the F1 segment is adjusted according to the operating frequency f of segment D3. D3 -20Hz, operating speed r D3 -600RPM operation, that is, the operating frequency f F1 =100Hz, operating speed r F1 =3000RPM, and keeps running until the thermostat is disconnected.

[0116] After the inverter compressor shuts down, it enters stage E1. When it restarts, it enters stage F2. The ambient temperature and return air pipe temperature at the end of the previous cycle are obtained, the temperature difference is calculated, and the corresponding operating frequency and speed adjustment values are obtained to adjust the inverter compressor's operating frequency and speed. This process continues until the temperature difference △t falls within the specified range of 1.8-2.2°C, maintaining the inverter compressor's operating frequency and speed unchanged.

[0117] By adopting the technical means of the embodiments of the present invention, the frequency of the variable frequency compressor can be effectively adjusted, so that the variable frequency compressor can achieve better working efficiency, thereby providing users with a good usage experience.

[0118] As a preferred embodiment, in step S14, that is, before controlling the variable frequency compressor to operate with the target operating parameters when starting up, the variable frequency controller is further configured to perform steps S01 to S03:

[0119] S01. Determine whether the target operating parameter is within a preset operating parameter limit range;

[0120] S02. When the target operating parameter is greater than the upper limit of the preset operating parameter limit range, updating the target operating parameter to the upper limit of the preset operating parameter limit range;

[0121] S03. When the target operating parameter is less than the lower limit of the preset operating parameter limit range, update the target operating parameter to the lower limit of the preset operating parameter limit range.

[0122] In the embodiment of the present invention, an operating parameter limit range is preset, and the variable frequency compressor should operate with operating parameters within the operating parameter limit range.

[0123] Preferably, the preset operating parameter limit range includes an operating frequency limit range and an operating speed limit range.

[0124] The operating frequency limit range is specifically: [40Hz, 140Hz];

[0125] The operating speed limit range is specifically: [1200RPM, 4200RPM].

[0126] Among them, the upper limit value f of the operating frequency limit range max =140Hz, the lower limit is f min =40Hz; upper limit value of operating speed limit range r max =4200RPM, the lower limit is r min =1200RPM.

[0127] Specifically, in the target operating parameters, when the target operating frequency f>f max When the operating frequency f is updated to the upper limit value f of the preset operating frequency limit range max , that is, let the target operating frequency f = f max ; When the target operating frequency f <f min When the operating frequency f is updated to the lower limit value f of the preset operating frequency limit range min , that is, let the target operating frequency f = f min .

[0128] Similarly, when the target operating speed r>r max When the target operating speed r=r max ; When the target speed r <r min When the target operating speed r=r min .

[0129] By adopting the technical means of the embodiments of the present invention, it is possible to ensure that the variable frequency compressor operates within a safe and reliable operating parameter range, thereby ensuring the normal operation of the refrigerator.

[0130] See also Figure 5 , is a schematic diagram of the structure of a variable frequency compressor system provided by one embodiment of the present invention. This embodiment of the present invention provides a variable frequency compressor system that can be applied to refrigerators, wine cabinets, bar cabinets, and other refrigeration cabinets that require a variable frequency compressor for refrigeration.

[0131] The variable frequency compressor system 20 includes: a variable frequency compressor 21, an ambient temperature sensor 22, a return air pipe temperature sensor 23, and a variable frequency controller 24. The ambient temperature sensor 22 is used to detect the current ambient temperature of the variable frequency compressor; the return air pipe temperature sensor 23 is installed on the return air pipe of the variable frequency compressor and is used to detect the current return air pipe temperature of the variable frequency compressor 21;

[0132] The variable frequency controller 24 is connected to the variable frequency compressor, the ambient temperature sensor, and the return air pipe temperature sensor, and is used to perform steps S21 to S24:

[0133] S21. After the variable frequency compressor is powered on, in response to a preset operating parameter control instruction, determining the current number of on-off cycles of the variable frequency compressor;

[0134] S22. If the current on-off cycle is within the first N on-off cycles after the variable frequency compressor is powered on, obtain the operating parameters corresponding to the current number of on-off cycles at the current ambient temperature based on the correspondence between the preset number of on-off cycles, the ambient temperature, and the operating parameters of the variable frequency compressor, and obtain the target operating parameters;

[0135] S23. If the current on-off cycle is after N on-off cycles after the variable frequency compressor is powered on, determine an operating parameter adjustment value based on the ambient temperature and the return air pipe temperature of the variable frequency compressor at the end of the previous on-off cycle, and calculate a target operating parameter based on the operating parameter adjustment value and the operating parameters of the variable frequency compressor in the previous on-off cycle;

[0136] S24. In the current on-off cycle, the variable frequency compressor is controlled to operate with the corresponding target operating parameters when starting operation.

[0137] By adopting the technical means of the embodiment of the present invention, after the variable frequency compressor is powered on, the variable frequency controller determines the operating parameters of the variable frequency compressor according to the current ambient temperature and the number of the variable frequency compressor's on-off cycles within the first N on-off cycles, and controls the variable frequency compressor to operate with corresponding preset constant operating parameters during startup, thereby promoting the variable frequency compressor to achieve better working efficiency and enabling the variable frequency compressor to enter a stable operating state more quickly; after N on-off cycles, the operating parameter adjustment value of the variable frequency compressor is determined according to the ambient temperature and the return air pipe temperature, and the frequency of the variable frequency compressor is adjusted, so that the variable frequency compressor can quickly achieve better working efficiency during the entire operation process, thereby providing users with a good user experience.

[0138] As a preferred embodiment, determining the operating parameter adjustment value based on the ambient temperature and the return air pipe temperature of the variable frequency compressor at the end of the previous start-stop cycle specifically includes:

[0139] Calculate the difference between the ambient temperature and the return air pipe temperature at the end of the previous start-stop cycle of the variable frequency compressor as the current temperature difference;

[0140] According to the preset correspondence between the temperature difference and the operating parameter adjustment value, the operating parameter adjustment value corresponding to the current temperature difference is obtained.

[0141] As a preferred embodiment, the target operating parameter is calculated based on the operating parameter adjustment value and the operating parameter of the previous on-off cycle of the variable frequency compressor, specifically:

[0142] The target operating parameter is obtained by adding the operating parameter adjustment value to the value of the operating parameter of the previous on-off cycle of the variable frequency compressor.

[0143] As a preferred embodiment, the variable frequency compressor system 20 further includes:

[0144] A start-stop controller connected to the frequency conversion controller 24, configured to send a frequency conversion compressor start signal to the frequency conversion controller when a preset start condition is met, and to send a frequency conversion compressor stop signal to the frequency conversion controller when a preset stop condition is met;

[0145] The variable frequency controller 24 is further configured to: control the variable frequency compressor to start running according to the variable frequency compressor start signal; and control the variable frequency compressor to stop running according to the variable frequency compressor stop signal.

[0146] Preferably, the start-stop controller is a temperature controller; the temperature controller is closed when a preset start-up temperature is reached, thereby sending a start-up signal for the variable frequency compressor, and is disconnected when a preset stop temperature is reached, thereby sending a stop signal for the variable frequency compressor.

[0147] See also Figure 6 , is a flow chart of a control method for a variable frequency compressor system provided by an embodiment of the present invention. The embodiment of the present invention provides a control method for a variable frequency compressor system, comprising steps S31 to S35:

[0148] S31, detecting the ambient temperature of the variable frequency compressor and the return air pipe temperature of the variable frequency compressor in real time;

[0149] S32. After the variable frequency compressor is powered on, in response to a preset operating parameter control instruction, determining the current number of on-off cycles of the variable frequency compressor;

[0150] S33. If the current on-off cycle is within the first N on-off cycles after the variable frequency compressor is powered on, obtain the operating parameters corresponding to the current number of on-off cycles at the current ambient temperature based on the correspondence between the preset number of on-off cycles, the ambient temperature, and the operating parameters of the variable frequency compressor, and obtain the target operating parameters;

[0151] S34. If the current on-off cycle is after N on-off cycles after the variable frequency compressor is powered on, determine an operating parameter adjustment value based on the ambient temperature and the return air pipe temperature of the variable frequency compressor at the end of the previous on-off cycle, and calculate a target operating parameter based on the operating parameter adjustment value and the operating parameters of the variable frequency compressor in the previous on-off cycle;

[0152] S35. In the current on-off cycle, the variable frequency compressor is controlled to operate with the corresponding target operating parameters when starting operation.

[0153] Preferably, step S34 is specifically as follows:

[0154] If the current on-off cycle is after N on-off cycles after the variable frequency compressor is powered on, the difference between the ambient temperature and the return air pipe temperature at the end of the previous on-off cycle of the variable frequency compressor is calculated as the current temperature difference;

[0155] According to the preset correspondence between the temperature difference and the operating parameter adjustment value, the operating parameter adjustment value corresponding to the current temperature difference is obtained;

[0156] The target operating parameter is obtained by adding the operating parameter adjustment value to the value of the operating parameter of the previous on-off cycle of the variable frequency compressor.

[0157] Preferably, before step S35, the method further comprises the steps of:

[0158] Determining whether the target operating parameter is within a preset operating parameter limit range;

[0159] When the target operating parameter is greater than the upper limit of the preset operating parameter limit range, updating the upper limit of the preset operating parameter limit range to the target operating parameter; and

[0160] When the target operating parameter is less than the lower limit of the preset operating parameter limit range, the lower limit of the preset operating parameter limit range is updated to the target operating parameter.

[0161] Preferably, the operating parameters include operating frequency and operating speed, the operating parameter adjustment values include operating frequency adjustment values and operating speed adjustment values, and the preset operating parameter limit ranges include operating frequency limit ranges and operating speed limit ranges.

[0162] It should be noted that the control method of a variable frequency compressor system provided in an embodiment of the present invention is the same as all the process steps executed by a variable frequency controller of a refrigerator or a variable frequency controller of a variable frequency compressor system in the above-mentioned embodiment. The working principles and beneficial effects of the two correspond one to one, and therefore will not be repeated here.

[0163] Those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing related hardware through a computer program. The program can be stored in a computer-readable storage medium, and when executed, the program can include the processes in the above-described method embodiments. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

[0164] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A refrigerator, characterized in that: include: The refrigerator body is equipped with a variable frequency compressor; An ambient temperature sensor, used to detect the current ambient temperature of the refrigerator; A return air pipe temperature sensor is provided on the return air pipe of the variable frequency compressor and is used to detect the current return air pipe temperature of the variable frequency compressor; A frequency conversion controller is connected to the frequency conversion compressor, the ambient temperature sensor, and the return air pipe temperature sensor, and is used to: After the variable frequency compressor is powered on, in response to a preset operating parameter control instruction, determining the current number of on-off cycles of the variable frequency compressor; If the current on-off cycle is within the first N on-off cycles after the variable frequency compressor is powered on, the operating parameters corresponding to the current number of on-off cycles at the current ambient temperature are obtained according to the correspondence between the preset number of on-off cycles, the ambient temperature and the operating parameters of the variable frequency compressor, and the target operating parameters are obtained; If the current on-off cycle is after N on-off cycles after the variable frequency compressor is powered on, an operating parameter adjustment value is determined based on the ambient temperature and the return air pipe temperature of the variable frequency compressor at the end of the previous on-off cycle, and a target operating parameter is calculated based on the operating parameter adjustment value and the operating parameters of the variable frequency compressor in the previous on-off cycle; In the current on-off cycle, the variable frequency compressor is controlled to operate with the corresponding target operating parameters when starting operation.

2. The refrigerator according to claim 1, wherein The step of determining the operating parameter adjustment value based on the ambient temperature and the return air pipe temperature of the variable frequency compressor at the end of the previous on / off cycle specifically includes: Calculate the difference between the ambient temperature and the return air pipe temperature at the end of the previous start-stop cycle of the variable frequency compressor as the current temperature difference; According to the preset correspondence between the temperature difference and the operating parameter adjustment value, the operating parameter adjustment value corresponding to the current temperature difference is obtained.

3. The refrigerator according to claim 1, wherein The target operating parameters are calculated based on the operating parameter adjustment value and the operating parameters of the variable frequency compressor in the previous on-off cycle, specifically: The target operating parameter is obtained by adding the operating parameter adjustment value to the value of the operating parameter of the previous on-off cycle of the variable frequency compressor.

4. The refrigerator according to claim 1, wherein The operating parameters include an operating frequency and an operating speed, and the operating parameter adjustment values include an operating frequency adjustment value and an operating speed adjustment value.

5. The refrigerator according to claim 4, wherein: Before controlling the variable frequency compressor to operate with the target operating parameters during startup, the variable frequency controller is further configured to: Determining whether the target operating parameter is within a preset operating parameter limit range; When the target operating parameter is greater than the upper limit of the preset operating parameter limit range, updating the target operating parameter to the upper limit of the preset operating parameter limit range; When the target operating parameter is less than the lower limit of the preset operating parameter limit range, the target operating parameter is updated to the lower limit of the preset operating parameter limit range.

6. The refrigerator according to claim 5, wherein The preset operating parameter limit range includes an operating frequency limit range and an operating speed limit range; The operating frequency limit range is specifically: [40Hz, 140Hz]; The operating speed limit range is specifically: [1200RPM, 4200RPM].

7. The refrigerator according to claim 1, wherein The refrigerator further comprises: A start-stop controller connected to the frequency conversion controller, configured to send a frequency conversion compressor start signal to the frequency conversion controller when a preset start condition is met, and to send a frequency conversion compressor stop signal to the frequency conversion controller when a preset stop condition is met; The variable frequency controller is further configured to: control the variable frequency compressor to start running according to the variable frequency compressor start signal; and control the variable frequency compressor to stop running according to the variable frequency compressor stop signal.

8. The refrigerator according to claim 7, wherein: The start-stop controller is a temperature controller; the temperature controller is closed when the preset start temperature is reached, thereby sending the variable frequency compressor start signal, and is disconnected when the preset stop temperature is reached, thereby sending the variable frequency compressor stop signal.

9. A variable frequency compressor system, characterized in that: include: Inverter compressor; An ambient temperature sensor, used to detect the ambient temperature of the variable frequency compressor; A return air pipe temperature sensor is provided on the return air pipe of the variable frequency compressor and is used to detect the current return air pipe temperature of the variable frequency compressor; A frequency conversion controller is connected to the frequency conversion compressor, the ambient temperature sensor, and the return air pipe temperature sensor, and is used to: After the variable frequency compressor is powered on, in response to a preset operating parameter control instruction, determining the current number of on-off cycles of the variable frequency compressor; If the current on-off cycle is within the first N on-off cycles after the variable frequency compressor is powered on, the operating parameters corresponding to the current number of on-off cycles at the current ambient temperature are obtained according to the correspondence between the preset number of on-off cycles, the ambient temperature and the operating parameters of the variable frequency compressor, and the target operating parameters are obtained; If the current on-off cycle is after N on-off cycles after the variable frequency compressor is powered on, an operating parameter adjustment value is determined based on the ambient temperature and the return air pipe temperature of the variable frequency compressor at the end of the previous on-off cycle, and a target operating parameter is calculated based on the operating parameter adjustment value and the operating parameters of the variable frequency compressor in the previous on-off cycle; In the current on-off cycle, the variable frequency compressor is controlled to operate with the corresponding target operating parameters when starting operation.

10. A control method for a variable frequency compressor system, characterized in that: include: Real-time detection of the ambient temperature of the variable frequency compressor and the return air pipe temperature of the variable frequency compressor; After the variable frequency compressor is powered on, in response to a preset operating parameter control instruction, determining the current number of on-off cycles of the variable frequency compressor; If the current on-off cycle is within the first N on-off cycles after the variable frequency compressor is powered on, the operating parameters corresponding to the current number of on-off cycles at the current ambient temperature are obtained according to the correspondence between the preset number of on-off cycles, the ambient temperature and the operating parameters of the variable frequency compressor, and the target operating parameters are obtained; If the current on-off cycle is after N on-off cycles after the variable frequency compressor is powered on, an operating parameter adjustment value is determined based on the ambient temperature and the return air pipe temperature of the variable frequency compressor at the end of the previous on-off cycle, and a target operating parameter is calculated based on the operating parameter adjustment value and the operating parameters of the variable frequency compressor in the previous on-off cycle; In the current on-off cycle, the variable frequency compressor is controlled to operate with the corresponding target operating parameters when starting operation.

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