A refrigerator, a variable frequency compressor, and a control method for a variable frequency compressor

Abstract

The present invention discloses a refrigerator, a variable frequency compressor and a control method for a variable frequency compressor. The refrigerator includes a variable frequency compressor, an ambient temperature sensor and a variable frequency controller. After the variable frequency compressor is powered on, the current number of on-off cycles of the variable frequency compressor is determined in response to a preset operating parameter control instruction. If it is after N on-off cycles, the target start-up rate at the current ambient temperature is determined according to the current ambient temperature, and then the corresponding operating parameter adjustment rules are determined. According to the start-up rate of the variable frequency compressor in the previous on-off cycle and the operating parameter adjustment rules, the operating parameters of the previous on-off cycle are adjusted accordingly, and the variable frequency compressor is controlled to operate with the adjusted operating parameters when it starts running. By adopting the technical means of the embodiments of the present invention, the frequency adjustment of the variable frequency compressor can be effectively achieved, so that the variable frequency compressor can achieve better working efficiency, thereby providing users with a good 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, and a control method for the variable frequency compressor. 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] However, the inventors have found that the existing technology has at least the following problems: the existing operating frequency adjustment strategy of the variable frequency compressor does not comprehensively consider the relationship between the ambient temperature and the operating state of the compressor, making it difficult for the compressor to achieve a better working efficiency. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a refrigerator, a variable frequency compressor and a control method for the variable frequency compressor, 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] Refrigerator cabinet;

[0007] A variable frequency compressor is provided in the refrigerator body;

[0008] An ambient temperature sensor is provided on the outside of the refrigerator body and is used to detect the current ambient temperature of the refrigerator;

[0009] A frequency conversion controller is connected to the frequency conversion compressor and the ambient 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 after N on / off cycles after the variable frequency compressor is powered on, determine the target on / off rate corresponding to the current ambient temperature according to the preset correspondence between the ambient temperature and the target on / off rate; wherein N ≥ 1;

[0012] Determine a corresponding operating parameter adjustment rule based on the target on-time rate corresponding to the current ambient temperature; wherein the operating parameter adjustment rule includes a correspondence between an on-time rate range of a previous on-off cycle and an operating parameter adjustment value;

[0013] According to the operating parameter adjustment rule, an operating parameter adjustment value corresponding to the start-up rate of the variable frequency compressor in the previous start-stop cycle is obtained;

[0014] adjusting the operating parameters of the variable frequency compressor in the previous on / off cycle according to the operating parameter adjustment value to obtain target operating parameters;

[0015] In the current on-off cycle, the variable frequency compressor is controlled to operate with the target operating parameters when starting operation.

[0016] As an improvement to the above solution, after determining the current number of on / off cycles of the variable frequency compressor in response to a preset operating parameter control instruction, the variable frequency controller is further configured to:

[0017] If the current start-stop cycle is within the first N start-stop cycles after the variable frequency compressor is powered on, the operating parameters corresponding to the current number of start-stop cycles at the current ambient temperature are obtained according to the correspondence between the preset number of start-stop cycles, the ambient temperature and the operating parameters of the variable frequency compressor, and the target operating parameters are obtained.

[0018] As an improvement to the above solution, the refrigerator further includes:

[0019] A start-stop controller is provided in the refrigerator body and is connected to the frequency conversion controller, and is used 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;

[0020] 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.

[0021] As an improvement to the above solution, the start-stop controller is a temperature controller; the temperature controller is closed when the preset start-up temperature is reached, thereby sending the variable frequency compressor start-up signal, and is disconnected when the preset stop temperature is reached, thereby sending the variable frequency compressor stop signal.

[0022] As an improvement to the above solution, the start-up rate of the variable frequency compressor in the previous start-stop cycle is calculated using the following formula:

[0023]

[0024] Wherein, η is the on-time rate of the previous on-off cycle, Ton is the on-time duration of the previous on-off cycle, and Toff is the off-time duration of the previous on-off cycle.

[0025] As an improvement to the above solution, 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.

[0026] As an improvement to the above solution, after obtaining the target operating parameters and before controlling the variable frequency compressor to operate with the target operating parameters when starting operation, the variable frequency controller is further configured to:

[0027] Determining whether the target operating parameter is within a preset operating parameter limit range;

[0028] 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;

[0029] 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.

[0030] As an improvement to the above solution, the preset operating parameter limit range includes an operating frequency limit range and an operating speed limit range;

[0031] The operating frequency limit range is specifically: [40Hz, 140Hz];

[0032] The operating speed limit range is specifically: [1200RPM, 4200RPM].

[0033] An embodiment of the present invention provides a variable frequency compressor, comprising:

[0034] Inverter compressor body;

[0035] An ambient temperature sensor is provided on the outside of the variable frequency compressor body and is used to detect the current ambient temperature of the variable frequency compressor;

[0036] A frequency conversion controller is connected to the frequency conversion compressor body and the ambient temperature sensor respectively, and is used to:

[0037] 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;

[0038] If the current on / off cycle is after N on / off cycles after the variable frequency compressor is powered on, determine the target on / off rate corresponding to the current ambient temperature according to a preset correspondence between the ambient temperature and the target on / off rate;

[0039] Determine a corresponding operating parameter adjustment rule based on the target on-time rate corresponding to the current ambient temperature; wherein the operating parameter adjustment rule includes a correspondence between an on-time rate range of a previous on-off cycle and an operating parameter adjustment value;

[0040] According to the operating parameter adjustment rule, an operating parameter adjustment value corresponding to the start-up rate of the variable frequency compressor in the previous start-stop cycle is obtained;

[0041] adjusting the operating parameters of the variable frequency compressor in the previous on / off cycle according to the operating parameter adjustment value to obtain target operating parameters;

[0042] In the current on-off cycle, the variable frequency compressor is controlled to operate with the target operating parameters when starting operation.

[0043] An embodiment of the present invention provides a method for controlling a variable frequency compressor, including:

[0044] Detecting the current ambient temperature of the variable frequency compressor;

[0045] 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;

[0046] If the current on / off cycle is after N on / off cycles after the variable frequency compressor is powered on, determine the target on / off rate corresponding to the current ambient temperature according to a preset correspondence between the ambient temperature and the target on / off rate;

[0047] Determine a corresponding operating parameter adjustment rule based on the target on-time rate corresponding to the current ambient temperature; wherein the operating parameter adjustment rule includes a correspondence between an on-time rate range of a previous on-off cycle and an operating parameter adjustment value;

[0048] According to the operating parameter adjustment rule, an operating parameter adjustment value corresponding to the start-up rate of the variable frequency compressor in the previous start-stop cycle is obtained;

[0049] adjusting the operating parameters of the variable frequency compressor in the previous on / off cycle according to the operating parameter adjustment value to obtain target operating parameters;

[0050] In the current on-off cycle, the variable frequency compressor is controlled to operate with the target operating parameters when starting operation.

[0051] Compared to the prior art, the refrigerator, variable frequency compressor, and variable frequency compressor control method disclosed in embodiments of the present invention include a variable frequency compressor and a variable frequency controller connected to the variable frequency compressor. After the variable frequency compressor is powered on, the variable frequency controller, in response to a preset operating parameter control instruction, determines the current number of on-off cycles for the variable frequency compressor. If the number of on-off cycles has reached N, the target on-off rate for the variable frequency compressor at the current ambient temperature is determined based on the current ambient temperature. Based on the target on-off rate, a corresponding operating parameter adjustment rule is then determined. Based on the on-off rate of the variable frequency compressor in the previous on-off cycle and the operating parameter adjustment rule, the operating parameters of the variable frequency compressor in the previous on-off cycle are adjusted accordingly, and the variable frequency compressor is controlled to operate with the adjusted operating parameters when it starts. The technical measures of the embodiments of the present invention effectively consider the relationship between ambient temperature and the target on-off rate of the variable frequency compressor, implement frequency adjustment of the variable frequency compressor, and achieve optimal operating efficiency for the variable frequency compressor, thereby providing a good user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a structural diagram of a refrigerator provided by one embodiment of the present invention;

[0053] Figure 2 Schematic diagram of the working process executed by the frequency conversion controller in an embodiment of the present invention;

[0054] Figure 3 is a structural schematic diagram of a refrigerator provided by another embodiment of the present invention;

[0055] Figure 4 1 is a schematic diagram of the control timing of the variable frequency compressor according to an embodiment of the present invention;

[0056] Figure 5 This is a structural diagram of a variable frequency compressor provided by one embodiment of the present invention;

[0057] Figure 6 The figure is a flow chart of a method for controlling a variable frequency compressor provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0058] 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.

[0059] See also Figure 1, is a schematic structural diagram of a refrigerator provided by an embodiment of the present invention. The embodiment of the present invention provides a refrigerator, comprising: a refrigerator body 11 , a variable frequency compressor 12 , an ambient temperature sensor 13 , and a variable frequency controller 14 .

[0060] The variable frequency compressor 12 is provided in the refrigerator body 11. It can be understood that the variable frequency compressor 12 is a functional component in the refrigerator refrigeration system, and is used to realize the transfer of refrigerant in the refrigeration system.

[0061] The ambient temperature sensor 13 is disposed outside the refrigerator body 11 and is used to detect the current ambient temperature of the refrigerator.

[0062] The frequency conversion controller 14 is disposed in the refrigerator body 11 and is connected to the frequency conversion compressor 12 and the ambient temperature sensor 13 respectively.

[0063] 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 is used to execute steps S11 to S16:

[0064] S11 . After the variable frequency compressor is powered on, in response to a preset operating parameter control instruction, determine the current number of on-off cycles of the variable frequency compressor.

[0065] After the variable frequency compressor is powered on, corresponding start-up conditions or stop conditions are pre-set to trigger the variable frequency controller 14 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 met again, the variable frequency compressor 12 is controlled to start running again, and this cycle is repeated.

[0066] 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.

[0067] In an embodiment of the present invention, after the variable frequency compressor is powered on, the variable frequency controller 14 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.

[0068] Specifically, during the control process of the operating parameters of each on-off cycle, the variable frequency controller 14 determines the on-off cycle number of the variable frequency compressor 12 after power-on, that is, determines the current on-off cycle number.

[0069] S12. If the current on / off cycle is after N on / off cycles after the variable frequency compressor is powered on, determine the target on / off rate corresponding to the current ambient temperature according to a preset correspondence between the ambient temperature and the target on / off rate; wherein N≥1.

[0070] S13. Determine a corresponding operating parameter adjustment rule based on the target on-rate corresponding to the current ambient temperature; wherein the operating parameter adjustment rule includes a correspondence between an on-rate range of a previous on / off cycle and an operating parameter adjustment value.

[0071] In one 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 current ambient temperature and the operating state of the variable frequency compressor.

[0072] The corresponding relationship between the ambient temperature and the target on-rate is preset and stored in the internal memory of the frequency conversion controller 14, so as to facilitate the calling of the frequency conversion controller 14. Different control operations are performed according to different ambient temperatures.

[0073] Preferably, in the corresponding relationship between the ambient temperature and the target startup rate, the ambient temperature and the target startup rate are positively correlated.

[0074] When the ambient temperature is high, a higher startup rate is required to prevent the temperature from not falling when the startup rate is low; when the ambient temperature is low, a lower startup rate is required to prevent frequent startups from increasing power consumption.

[0075] During the application process, the frequency conversion controller 14 obtains the current ambient temperature te of the refrigerator sent by the ambient temperature sensor 13 in real time. And based on the correspondence between the preset ambient temperature and the target start-up rate, the target start-up rate X0 corresponding to the current ambient temperature te is determined. Furthermore, based on the target start-up rate X0 corresponding to the current ambient temperature te, the operating parameter adjustment rule corresponding to the target start-up rate X0 under the current ambient temperature te is determined. Among them, the operating parameter adjustment rule includes the correspondence between the start-up rate range of the previous start-stop cycle and the operating parameter adjustment value, and in the correspondence, the start-up rate range of each previous start-stop cycle is determined by the target start-up rate. Thus, according to the operating parameter adjustment rule, the operating parameters of the variable frequency compressor 12 are adjusted.

[0076] S14. According to the operating parameter adjustment rule, an operating parameter adjustment value corresponding to the start-up rate of the variable frequency compressor in the previous start-stop cycle is obtained.

[0077] S15. Adjust the operating parameters of the variable frequency compressor in the previous on / off cycle according to the operating parameter adjustment value to obtain target operating parameters.

[0078] Furthermore, the variable frequency controller 14 calculates the on-rate X of the variable frequency compressor in the previous on-off cycle, and obtains the operating parameter adjustment value corresponding to the on-rate X of the variable frequency compressor in the previous on-off cycle according to the correspondence between the on-rate range of the previous on-off cycle and the operating parameter adjustment value preset in the operating parameter adjustment rule. Then, the operating parameters of the variable frequency compressor in the previous on-off cycle are adjusted according to the operating parameter adjustment value, and used as the target operating parameters of the variable frequency compressor 12 in the current on-off cycle.

[0079] It should be noted that adjusting the operating parameters of the previous on-off cycle according to the operating parameter adjustment value refers to adding the operating parameter value of the previous on-off cycle to the operating parameter adjustment value to obtain the adjusted operating parameter value. The operating parameter adjustment value can be a positive or negative number, or even zero. Therefore, the adjustment results of the operating parameters of the previous on-off cycle include increasing the operating parameters, decreasing the operating parameters, or maintaining the operating parameters unchanged.

[0080] Specifically, the on-time rate of the variable frequency compressor in the previous on-off cycle is calculated using the following formula:

[0081]

[0082] Wherein, η is the on-time rate of the previous on-off cycle, Ton is the on-time duration of the previous on-off cycle, and Toff is the off-time duration of the previous on-off cycle.

[0083] S16. In the current on-off cycle, the variable frequency compressor is controlled to operate with the target operating parameters when starting operation.

[0084] The variable frequency controller 14 sends a corresponding control signal to the variable frequency compressor according to the calculated target operating parameters under the current on-off cycle, so as to control the variable frequency compressor to operate at the target operating parameters.

[0085] An embodiment of the present invention provides a refrigerator comprising a variable-frequency compressor and a variable-frequency controller connected to the variable-frequency compressor. After the variable-frequency compressor is powered on, the variable-frequency controller determines the current number of on-off cycles of the variable-frequency compressor in response to a preset operating parameter control instruction. If the number of on-off cycles has reached N, the target on-time rate of the variable-frequency compressor at the current ambient temperature is determined based on the current ambient temperature, and then a corresponding operating parameter adjustment rule is determined based on the target on-time rate. Based on the on-time rate of the variable-frequency compressor in the previous on-off cycle and the operating parameter adjustment rule, the operating parameters of the variable-frequency compressor in the previous on-off cycle are adjusted accordingly, and the variable-frequency compressor is controlled to operate with the adjusted operating parameters when it starts operating. The technical means of the embodiments of the present invention can effectively consider the relationship between the ambient temperature and the target on-time rate of the variable-frequency compressor, implement frequency adjustment of the variable-frequency compressor, and achieve optimal operating efficiency for the variable-frequency compressor, thereby providing a good user experience.

[0086] As a preferred implementation, based on the above embodiment, after step S11, the frequency conversion controller 14 is further configured to perform step S17:

[0087] S17. 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, so as to obtain the target operating parameters.

[0088] In one case, if the current number of on-off cycles is less than or equal to a preset number N, that is, the current on-off cycle is within the first N on-off cycles after the variable frequency compressor was powered on, the variable frequency compressor is not yet in a stable operating state. Its operating parameters are related to the current ambient temperature of the refrigerator and are pre-set. When the ambient temperature is fixed, the corresponding operating parameters are constant values.

[0089] 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 14 for easy access by the variable frequency controller 14. Different control operations are performed according to different ambient temperatures and the number of on / off cycles.

[0090] During use, the variable frequency controller 14 obtains the current refrigerator ambient temperature te sent by 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.

[0091] 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.

[0092] 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 on-off cycles of the variable frequency compressor within the first N on-off cycles, and controls the variable frequency compressor to operate with corresponding preset constant operating parameters when starting operation, which can effectively realize the frequency adjustment of the variable frequency compressor and promote the variable frequency compressor to achieve better working efficiency more quickly.

[0093] As a preferred embodiment, see Figure 3 , a schematic structural diagram of a refrigerator provided by another embodiment of the present invention. Based on the above embodiment, the refrigerator 10 further includes a start-stop controller 15.

[0094] The start-stop controller 15 is provided in the refrigerator body and is connected to the frequency conversion controller 14. The start-stop controller 15 is used to:

[0095] When the preset start-up condition is met, a start-up signal of the variable frequency compressor is sent to the variable frequency controller 14, and when the preset stop condition is met, a stop signal of the variable frequency compressor is sent to the variable frequency controller 14;

[0096] The variable frequency controller 14 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.

[0097] Preferably, the start-stop controller 15 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.

[0098] 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.

[0099] It should be noted that the variable frequency controller 14 can determine the number of each start and stop cycle of the variable frequency compressor based on the received variable frequency compressor start signal and the variable frequency compressor stop signal; or it can determine the number of each start and stop cycle of the variable frequency compressor based on the start-up operating state and the stop operating state of the variable frequency compressor, both of which do not affect the beneficial effects achieved by the present invention.

[0100] 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.

[0101] As a preferred embodiment, the operating parameters include an operating frequency f (unit: Hz) and an operating speed r (unit: RPM).

[0102] 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.

[0103] The operating parameter adjustment values include an operating frequency adjustment value Δf and an operating speed adjustment value Δr. In the operating parameter adjustment rule, the correspondence between the operating rate range of the previous start-stop cycle and the operating parameter adjustment values is specifically: the correspondence between the operating rate range of the previous start-stop cycle and the operating frequency adjustment value and the operating speed adjustment value.

[0104] Then, in step S16, in the current on-off cycle, the variable frequency compressor is controlled to operate with the corresponding target operating parameters during startup, specifically:

[0105] In the current on-off cycle, the variable frequency compressor is controlled to operate at the corresponding target operating frequency and target operating speed during startup.

[0106] Preferably, N=5 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 S17 is specifically shown in Table 1:

[0107] Table 1

[0108]

[0109] 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.

[0110] 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.

[0111] 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.

[0112] When the variable frequency compressor is started again, it enters the F1 stage in the fifth start-stop cycle and determines the corresponding operating parameters based on the current ambient temperature te. For example, if the current ambient temperature te = 32°C, querying Table 1 shows that in the fifth start-stop cycle, the operating frequency is 60Hz and the operating speed is 1200RPM. It continues to run until the temperature controller is disconnected and the frequency conversion board controls the variable frequency compressor to stop, which is the E1 stage.

[0113] It can be understood that the operating frequency and operating speed of the above five 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 will be followed when it is powered on again.

[0114] Furthermore, the corresponding relationship between the preset ambient temperature and the target power-on rate applied in step S12 is specifically:

[0115] The target startup rate corresponding to the ambient temperature te≥36℃ is: 85%-95%;

[0116] The target startup rate for an ambient temperature of 36°C > te ≥ 28°C is 65%-75%.

[0117] The target startup rate for an ambient temperature of 28°C > te ≥ 20°C is 45%-55%.

[0118] The target startup rate corresponding to the ambient temperature te<20℃ is: 25%-35%.

[0119] The corresponding table is shown in Table 2:

[0120] Table 2

[0121] Ambient temperature (te) <![CDATA[Target startup rate (X0)]]> te≥36℃ 85％-95％ 36℃>te≥28℃ 65％-75％ 28℃>te≥20℃ 45％-55％ te<20℃ 25％-35％

[0122] In step S13, the corresponding operating parameter adjustment rules are determined according to the target startup rate corresponding to the current ambient temperature, specifically including:

[0123] S131. Determine the on-rate ranges of several previous on-off cycles based on the target on-rate corresponding to the current ambient temperature;

[0124] S132: Determine an operating parameter adjustment value corresponding to the start-up rate range of each previous start-up / stop cycle, thereby obtaining the operating parameter adjustment rule.

[0125] Specifically, the on-rate ranges X of several previous on-off cycles corresponding to any of the target on-rate X0 are respectively:

[0126] The startup rate ranges of the previous start-stop cycles are X+70%, X+60%, X+50%, X+40%, X+30%, X+20%, X+10%, X, X-10%, X-20%, X-30%, X-40%, X-50%, X-60%, X-70%, X-80%, and X-90%, a total of 17 ranges.

[0127] For example, when the ambient temperature is te=32°C, the corresponding target startup rate X0 is 65%-75%. In the corresponding operating parameter adjustment rule, the startup rate ranges X of several previous start-stop cycles are 135%-145%, 125%-135%, 115%-125%, 105%-115%, 95%-105%, 85%-95%, 75%-85%, 65%-75%, 55%-65%, and 45%-55%.

[0128] The operating parameter adjustment value corresponding to the start-up rate range of each previous start-stop cycle is specifically:

[0129] The operating parameter adjustment values corresponding to the operating rate range of the previous start-stop cycle is X+70% include: operating frequency value +35Hz, operating speed adjustment value +1050RPM;

[0130] The operating parameter adjustment values corresponding to the operating rate range of the previous start-stop cycle is X+60% include: operating frequency value +30Hz, operating speed adjustment value +900RPM;

[0131] The operating parameter adjustment values corresponding to the operating rate range of the previous start-stop cycle is X+50% include: the operating frequency value is +25Hz, and the operating speed adjustment value is +750RPM;

[0132] The operating parameter adjustment values corresponding to the operating rate range of the previous start-stop cycle is X+40% include: operating frequency value +20Hz, operating speed adjustment value +600RPM;

[0133] The operating parameter adjustment values corresponding to the operating rate range of the previous start-stop cycle is X+30% include: the operating frequency value is +15Hz, and the operating speed adjustment value is +450RPM;

[0134] The operating parameter adjustment values corresponding to the operating rate range of the previous start-stop cycle is X+20% include: operating frequency value +10Hz, operating speed adjustment value +300RPM;

[0135] The operating parameter adjustment values corresponding to the operating rate range of the previous start-stop cycle is X+10% include: operating frequency value +5Hz, operating speed adjustment value +150RPM;

[0136] The operating parameter adjustment values corresponding to the start-up rate range of the previous start-stop cycle is X interval include: the operating frequency value is 0Hz, the operating speed adjustment value is 0RPM;

[0137] The operating parameter adjustment values corresponding to the operating rate range of the previous start-stop cycle is X-10% include: the operating frequency value is -5Hz, the operating speed adjustment value is -150RPM;

[0138] The operating parameter adjustment values corresponding to the operating rate range of the previous start-stop cycle is X-20% include: the operating frequency value is -10Hz, the operating speed adjustment value is -300RPM;

[0139] The operating parameter adjustment values corresponding to the operating rate range of the previous start-stop cycle is X-30% include: the operating frequency value is -15Hz, the operating speed adjustment value is -450RPM;

[0140] The operating parameter adjustment values corresponding to the operating rate range of the previous start-stop cycle is X-40% include: the operating frequency value is -20Hz, the operating speed adjustment value is -600RPM;

[0141] The operating parameter adjustment values corresponding to the operating rate range of the previous start-stop cycle is X-50% include: the operating frequency value is -25Hz, the operating speed adjustment value is -750RPM;

[0142] The operating parameter adjustment values corresponding to the operating rate range of the previous start-stop cycle is X-60% include: the operating frequency value is -30Hz, the operating speed adjustment value is -900RPM;

[0143] The operating parameter adjustment values corresponding to the operating rate range of the previous start-stop cycle is X-70% include: the operating frequency value is -35Hz, the operating speed adjustment value is -1050RPM;

[0144] The operating parameter adjustment values corresponding to the operating rate range of the previous start-stop cycle is X-80% include: the operating frequency value is -40Hz, the operating speed adjustment value is -1200RPM;

[0145] The operating parameter adjustment values corresponding to the start-up rate range of the previous start-stop cycle being X-90% include: an operating frequency value of -45 Hz, and an operating speed adjustment value of -1350 RPM.

[0146] The corresponding results are shown in Table 3:

[0147]

[0148]

[0149] See also Figure 4 After stage E1, when the variable frequency compressor is turned on again, it enters stage F2. Starting from this start-stop cycle, the corresponding target start-up rate is determined according to the current ambient temperature. Then, according to the target start-up rate, the corresponding operating parameter adjustment rules are determined, and the operating frequency and operating speed of this cycle are calculated according to the start-up rate of the previous cycle.

[0150] For example, assuming the current ambient temperature is 32°C, the corresponding target on-rate X0 is 65%-75%; the operating frequency of the previous on-off cycle is 100Hz, the operating speed is 3000RPM, and the on-rate of the previous on-off cycle is F1 period / (F1 period + E1 period) = 86%, which is in the range of 85%-95%, that is, in the range of X+20%. From the table, we know that △f=+10Hz, △r=+300RPM, that is, F2 is running at the operating frequency f of F1 period. F1 +10Hz, operating speed r F1 +300RPM operation, that is, the operating frequency f F2 =110Hz, operating speed r F2 =3300RPM.

[0151] After the variable frequency compressor stops, it enters the E2 stage, and when it starts again, it enters the F3 stage. The current ambient temperature te is obtained, and the startup rate of the previous cycle is calculated as: F2 stage time / (F2 stage time + E2 stage time). Then, the corresponding operating frequency adjustment value and operating speed adjustment value are obtained according to the above method to adjust the operating frequency and operating speed of the variable frequency compressor.

[0152] 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. In addition, the refrigerator does not need to be equipped with a large number of additional sensors, which can effectively save the production cost of the refrigerator, thereby providing users with a good user experience.

[0153] As a preferred embodiment, after step S15 or S17 and before step S16, the frequency conversion controller 14 is further configured to perform steps S01 to S03:

[0154] S01. Determine whether the target operating parameter is within a preset operating parameter limit range.

[0155] S02. When the target operating parameter is greater than an upper limit of the preset operating parameter limit range, the upper limit of the preset operating parameter limit range is updated to the target operating parameter.

[0156] S03. 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.

[0157] 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.

[0158] Preferably, the preset operating parameter limit range includes an operating frequency limit range and an operating speed limit range;

[0159] The operating frequency limit range is specifically: [40Hz, 140Hz];

[0160] The operating speed limit range is specifically: [1200RPM, 4200RPM].

[0161] 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.

[0162] Specifically, in the target operating parameters, when the target operating frequency f>f max When the target operating frequency f=f max ; When the target operating frequency f<f min When the target operating frequency f=f min ; When the target operating speed r>r max When the target operating speed r=r max ; When the target operating speed r<r min When the target operating speed r=r min .

[0163] As a preferred embodiment, in order to prevent the speed from being too low during a certain period of startup, causing the variable frequency compressor to not stop, if the compressor continues to work for a first preset time, for example, 6 hours without stopping, the compressor is forced to stop for a second preset time, for example, 10 minutes. When the startup is next time, the startup rate is calculated to be 97.3%. The variable frequency compressor is directly controlled to increase the frequency according to the corresponding relationship in Table 2.

[0164] 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.

[0165] See also Figure 5 , is a schematic structural diagram of a variable frequency compressor provided by an embodiment of the present invention. The embodiment of the present invention provides a variable frequency compressor 20 , comprising a variable frequency compressor body 21 , an ambient temperature sensor 22 , and a variable frequency controller 23 .

[0166] The ambient temperature sensor 22 is disposed outside the variable frequency compressor body and is used to detect the current ambient temperature of the variable frequency compressor.

[0167] The frequency conversion controller 23 is connected to the frequency conversion compressor body 21 and the ambient temperature sensor 22 respectively, and is used to perform steps S21 to S27:

[0168] 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;

[0169] 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;

[0170] S23, if the current on-off cycle is after N on-off cycles after the variable frequency compressor is powered on, determining the target on-off rate corresponding to the current ambient temperature according to a preset correspondence between the ambient temperature and the target on-off rate;

[0171] S24. Determine a corresponding operating parameter adjustment rule based on the target operating rate corresponding to the current ambient temperature; wherein the operating parameter adjustment rule includes a correspondence between an operating rate range in a previous on / off cycle and an operating parameter adjustment value;

[0172] S25. Obtaining an operating parameter adjustment value corresponding to the start-up rate of the variable frequency compressor in the previous start-stop cycle according to the operating parameter adjustment rule;

[0173] S26, adjusting the operating parameters of the variable frequency compressor in the previous on / off cycle according to the operating parameter adjustment value to obtain target operating parameters;

[0174] S27. In the current on-off cycle, control the variable frequency compressor to operate with the target operating parameters when starting operation.

[0175] By adopting the technical means of the embodiments of the present invention, the relationship between the ambient temperature and the target start-up rate of the variable frequency compressor can be effectively considered, and the frequency of the variable frequency compressor can be adjusted to enable the variable frequency compressor to achieve better working efficiency, thereby providing users with a good user experience.

[0176] As a preferred embodiment, the variable frequency compressor 20 further includes:

[0177] The start-stop controller 24 is arranged in the variable frequency compressor body 21 and is connected to the variable frequency controller 23. It is used to send a variable frequency compressor start signal to the variable frequency controller when the preset start condition is met, and send a variable frequency compressor stop signal to the variable frequency controller when the preset stop condition is met.

[0178] The variable frequency controller 23 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.

[0179] Preferably, the start-stop controller 24 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.

[0180] As a preferred embodiment, after step S22 or S26 and before step S27, the frequency conversion controller 23 is further configured to:

[0181] Determining whether the target operating parameter is within a preset operating parameter limit range;

[0182] 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

[0183] 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.

[0184] Preferably, the operating parameters include an operating frequency and an operating speed, the operating parameter adjustment value includes an operating frequency adjustment value and an operating speed adjustment value, and the preset operating parameter limit range includes an operating frequency limit range and an operating speed limit range;

[0185] The operating frequency limit range is specifically: [40Hz, 140Hz];

[0186] The operating speed limit range is specifically: [1200RPM, 4200RPM].

[0187] See also Figure 6 , is a flow chart of a method for controlling a variable frequency compressor provided by an embodiment of the present invention. The embodiment of the present invention also provides a method for controlling a variable frequency compressor, comprising steps S31 to S37:

[0188] S31, detecting the current ambient temperature of the variable frequency compressor;

[0189] 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;

[0190] S33, if the current on-off cycle is after N on-off cycles after the variable frequency compressor is powered on, determining the target on-off rate corresponding to the current ambient temperature according to a preset correspondence between the ambient temperature and the target on-off rate;

[0191] S34. Determine a corresponding operating parameter adjustment rule based on the target on-rate corresponding to the current ambient temperature; wherein the operating parameter adjustment rule includes a correspondence between an on-rate range in a previous on / off cycle and an operating parameter adjustment value;

[0192] S35. Obtaining an operating parameter adjustment value corresponding to the start-up rate of the variable frequency compressor in the previous start-stop cycle according to the operating parameter adjustment rule;

[0193] S36, adjusting the operating parameters of the variable frequency compressor in the previous on / off cycle according to the operating parameter adjustment value to obtain target operating parameters;

[0194] S37. In the current on-off cycle, control the variable frequency compressor to operate with the target operating parameters when starting operation.

[0195] Preferably, after step S32, the method further comprises step S38:

[0196] S38. 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, so as to obtain the target operating parameters.

[0197] Preferably, after step S36 or S38 and before step S37, the method further includes:

[0198] S37', determining whether the target operating parameter is within a preset operating parameter limit range;

[0199] 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

[0200] 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.

[0201] 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.

[0202] It should be noted that the control method of a variable frequency compressor 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 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.

[0203] 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).

[0204] 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: Refrigerator cabinet; A variable frequency compressor is provided in the refrigerator body; An ambient temperature sensor is provided on the outside of the refrigerator body and is used to detect the current ambient temperature of the refrigerator; A frequency conversion controller is connected to the frequency conversion compressor and the ambient 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 after N on / off cycles after the variable frequency compressor is powered on, determine the target on / off rate corresponding to the current ambient temperature according to the preset correspondence between the ambient temperature and the target on / off rate; wherein N ≥ 1; Determine a corresponding operating parameter adjustment rule based on the target on-time rate corresponding to the current ambient temperature; wherein the operating parameter adjustment rule includes a correspondence between an on-time rate range of a previous on-off cycle and an operating parameter adjustment value; According to the operating parameter adjustment rule, an operating parameter adjustment value corresponding to the start-up rate of the variable frequency compressor in the previous start-stop cycle is obtained; adjusting the operating parameters of the variable frequency compressor in the previous on / off cycle according to the operating parameter adjustment value to obtain target operating parameters; In the current on-off cycle, the variable frequency compressor is controlled to operate with the target operating parameters when starting operation.

2. The refrigerator according to claim 1, wherein After determining the current number of on / off cycles of the variable frequency compressor in response to the preset operating parameter control instruction, the variable frequency controller is further configured to: If the current start-stop cycle is within the first N start-stop cycles after the variable frequency compressor is powered on, the operating parameters corresponding to the current number of start-stop cycles at the current ambient temperature are obtained according to the correspondence between the preset number of start-stop cycles, the ambient temperature and the operating parameters of the variable frequency compressor, and the target operating parameters are obtained.

3. The refrigerator according to claim 1, wherein The refrigerator further comprises: A start-stop controller is provided in the refrigerator body and is connected to the frequency conversion controller, and is used 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.

4. The refrigerator according to claim 3, 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.

5. The refrigerator according to claim 1, wherein The on-time rate of the variable frequency compressor in the previous on-off cycle is calculated using the following formula: Wherein, η is the on-time rate of the previous on-off cycle, Ton is the on-time duration of the previous on-off cycle, and Toff is the off-time duration of the previous on-off cycle.

6. 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.

7. The refrigerator according to claim 6, wherein After obtaining the target operating parameters, and before controlling the variable frequency compressor to operate with the target operating parameters when starting operation, 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 upper limit of the preset operating parameter limit range to the target operating parameter; 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.

8. The refrigerator according to claim 7, 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].

9. A variable frequency compressor, characterized in that: include: Inverter compressor body; An ambient temperature sensor is provided on the outside of the variable frequency compressor body and is used to detect the current ambient temperature of the variable frequency compressor; A frequency conversion controller is connected to the frequency conversion compressor body and the ambient temperature sensor respectively, 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 after N on / off cycles after the variable frequency compressor is powered on, determine the target on / off rate corresponding to the current ambient temperature according to a preset correspondence between the ambient temperature and the target on / off rate; Determine a corresponding operating parameter adjustment rule based on the target on-time rate corresponding to the current ambient temperature; wherein the operating parameter adjustment rule includes a correspondence between an on-time rate range of a previous on-off cycle and an operating parameter adjustment value; According to the operating parameter adjustment rule, an operating parameter adjustment value corresponding to the start-up rate of the variable frequency compressor in the previous start-stop cycle is obtained; adjusting the operating parameters of the variable frequency compressor in the previous on / off cycle according to the operating parameter adjustment value to obtain target operating parameters; In the current on-off cycle, the variable frequency compressor is controlled to operate with the target operating parameters when starting operation.

10. A method for controlling a variable frequency compressor, characterized in that: include: Detecting the current ambient 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 after N on / off cycles after the variable frequency compressor is powered on, determine the target on / off rate corresponding to the current ambient temperature according to a preset correspondence between the ambient temperature and the target on / off rate; Determine a corresponding operating parameter adjustment rule based on the target on-time rate corresponding to the current ambient temperature; wherein the operating parameter adjustment rule includes a correspondence between an on-time rate range of a previous on-off cycle and an operating parameter adjustment value; According to the operating parameter adjustment rule, an operating parameter adjustment value corresponding to the start-up rate of the variable frequency compressor in the previous start-stop cycle is obtained; adjusting the operating parameters of the variable frequency compressor in the previous on / off cycle according to the operating parameter adjustment value to obtain target operating parameters; In the current on-off cycle, the variable frequency compressor is controlled to operate with the target operating parameters when starting operation.

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