A control method for a refrigerator and its inverter compressor

Abstract

This invention discloses a refrigerator and its inverter compressor control method. After the inverter compressor is powered on, preset operating parameters are acquired as the operating parameters for the inverter compressor during the first start-stop cycle. During non-first start-stop cycles, based on the preset correspondence between ambient temperature and operating rate threshold conditions, the operating rate threshold condition corresponding to the current ambient temperature is determined. Based on the relationship between the operating rate of the previous start-stop cycle and the operating rate threshold condition, the operating parameters for starting the inverter compressor are determined. Based on the preset correspondence between ambient temperature and operating parameter adjustment strategies, the operating parameter adjustment strategy corresponding to the current ambient temperature is determined, thereby determining the corresponding parameter adjustment value, and adjusting the current operating parameters according to the parameter adjustment value. Using this invention, the frequency of the inverter compressor can be effectively adjusted to achieve better working efficiency and improve the user experience.

Description

Technical Field

[0001] This invention relates to the field of refrigerator control technology, and in particular to a control method for a refrigerator and its inverter compressor. Background Technology

[0002] As people become increasingly aware of energy conservation and environmental protection, countries are imposing higher and higher energy consumption requirements. Variable frequency refrigerators, adapting to these requirements, are becoming increasingly popular. Variable frequency compressors, with their advantages of energy saving and low noise, achieve optimal operating efficiency through stepless speed adjustment, keeping the compressor in its best operating state.

[0003] Existing variable frequency compressor control strategies typically adjust the operating parameters of the compressor during each start-stop cycle. However, in implementing this invention, the inventors discovered that the prior art has at least the following problems: the operating state of the variable frequency compressor is affected by various factors, and existing variable frequency compressor control strategies do not comprehensively consider the impact of various factors on the compressor's operating state. Furthermore, the operating parameters of the variable frequency compressor remain constant throughout the entire start-stop cycle, failing to comprehensively consider the changes in the compressor's operating state during the current operation, making it difficult to achieve optimal compressor efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a control method for a refrigerator and its inverter compressor, which can effectively adjust the frequency of the inverter compressor to achieve better working efficiency and improve the user experience.

[0005] To achieve the above objectives, embodiments of the present invention provide a refrigerator, comprising:

[0006] Variable frequency compressor;

[0007] An ambient temperature sensor is used to detect the current ambient temperature.

[0008] Controller, used for:

[0009] After the variable frequency compressor is powered on, preset operating parameters are acquired as the operating parameters of the variable frequency compressor in the first start-stop cycle;

[0010] In non-first start-stop cycles, the start-stop threshold condition corresponding to the current ambient temperature is determined based on the preset correspondence between ambient temperature and start-up rate threshold condition. The operating parameters of the variable frequency compressor at startup are determined based on the relationship between the start-up rate of the previous start-stop cycle and the start-up rate threshold condition.

[0011] Based on the preset correspondence between ambient temperature and operating parameter adjustment strategies, the operating parameter adjustment strategy corresponding to the current ambient temperature is determined. Based on the real-time start-up rate of the current start-up / shutdown cycle and the operating parameter adjustment strategy, the corresponding parameter adjustment value is determined, and the current operating parameters are adjusted according to the parameter adjustment value. The operating parameter adjustment strategy includes the correspondence between the real-time start-up rate and the parameter adjustment value.

[0012] As an improvement to the above solution, the step of acquiring preset operating parameters as the operating parameters of the variable frequency compressor during the first start-stop cycle after the variable frequency compressor is powered on specifically includes:

[0013] After the variable frequency compressor is powered on, the variable frequency compressor enters the first start-stop cycle, acquires the preset first operating parameters, and controls the variable frequency compressor to run with the first operating parameters during the start-up process;

[0014] Real-time determination of whether the start-up time of the variable frequency compressor has reached the preset time under the current start-up and stop cycle;

[0015] When the start-up time of the variable frequency compressor reaches the preset time, the preset maximum operating parameters are obtained, and the variable frequency compressor is controlled to operate at the maximum operating parameters during the start-up process.

[0016] As an improvement to the above solution, the correspondence between the preset ambient temperature and the power-on rate threshold conditions specifically includes:

[0017] When the ambient temperature is within the range of te≥38℃, the corresponding start-up rate threshold condition is: the start-up rate of the previous start-up / stop cycle is within the start-up rate threshold range of 85%≤X′≤90%.

[0018] When the ambient temperature is within the range of 32℃≤te<38℃, the corresponding start-up rate threshold condition is: the start-up rate of the previous start-up / stop cycle is within the start-up rate threshold range of 80%≤X′≤85%.

[0019] When the ambient temperature is within the range of 26℃≤te<32℃, the corresponding start-up rate threshold condition is: the start-up rate of the previous start-up / stop cycle is within the start-up rate threshold range of 70%≤X′≤75%.

[0020] When the ambient temperature is within the range of 20℃≤te<26℃, the corresponding start-up rate threshold condition is: the start-up rate of the previous start-up / stop cycle is within the start-up rate threshold range of 60%≤X′≤65%.

[0021] When the ambient temperature is within the range of 14℃≤te<20℃, the corresponding start-up rate threshold condition is: the start-up rate of the previous start-up / stop cycle is within the start-up rate threshold range of 50%≤X′≤55%.

[0022] When the ambient temperature is within the range of te < 14℃, the corresponding start-up rate threshold condition is: the start-up rate of the previous start-up / stop cycle is within the start-up rate threshold range of 40% ≤ X′ ≤ 45%.

[0023] Where te is the ambient temperature and X′ is the operating rate of the previous start-stop cycle.

[0024] As an improvement to the above scheme, the operating parameters of the variable frequency compressor at startup are determined based on the relationship between the start-up rate of the previous start-up / shutdown cycle and the start-up rate threshold condition, specifically including:

[0025] When the start-up rate of the previous start-up / stop cycle meets the start-up rate threshold condition, the operating parameters of the variable frequency compressor when starting up in the current start-up / stop cycle are determined to be the operating parameters of the variable frequency compressor when starting up in the previous start-up / stop cycle.

[0026] When the start-up rate of the previous start-up / stop cycle does not meet the start-up rate threshold condition, the operating parameters of the variable frequency compressor when it starts up in the previous start-up / stop cycle are adjusted according to the preset operating parameter adjustment step size, so as to determine the operating parameters of the variable frequency compressor when it starts up in the current start-up / stop cycle.

[0027] As an improvement to the above scheme, when the start-up rate of the previous start-up / shutdown cycle does not meet the start-up rate threshold condition, the operating parameters of the variable frequency compressor during startup in the previous start-up / shutdown cycle are adjusted according to a preset operating parameter adjustment step size, specifically including:

[0028] When the start-up rate of the previous start-up / stop cycle is less than the lower limit of the start-up rate threshold range corresponding to the start-up rate threshold condition, the operating parameters of the variable frequency compressor when it starts in the previous start-up / stop cycle are reduced by the preset operating parameter adjustment step size.

[0029] When the start-up rate of the previous start-up / stop cycle is greater than the upper limit of the start-up rate threshold range corresponding to the start-up rate threshold condition, the operating parameters of the variable frequency compressor when it starts up in the previous start-up / stop cycle are increased by the preset operating parameter adjustment step size.

[0030] As an improvement to the above scheme, the operating parameters include the operating speed, the preset operating parameter adjustment step size includes the operating speed adjustment step size, and the operating speed adjustment step size is 300 RPM.

[0031] As an improvement to the above solution, the correspondence between the preset ambient temperature and the operating parameter adjustment strategy specifically includes:

[0032] When the ambient temperature is within the range of te≥38℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate is X<75%, the corresponding parameter adjustment value is 0; if the real-time uptime rate is 75%≤X<85%, the corresponding parameter adjustment value is a; if the real-time uptime rate is 85%≤X<90%, the corresponding parameter adjustment value is 2a; if the real-time uptime rate is X≥90%, the corresponding parameter adjustment value is b.

[0033] When the ambient temperature is within the range of 32℃≤te<38℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate is X<70%, the corresponding parameter adjustment value is 0; if the real-time uptime rate is 70%≤X<80%, the corresponding parameter adjustment value is a; if the real-time uptime rate is 80%≤X<90%, the corresponding parameter adjustment value is 2a; if the real-time uptime rate is X≥90%, the corresponding parameter adjustment value is b.

[0034] When the ambient temperature is within the range of 26℃≤te<32℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate is X<60%, the corresponding parameter adjustment value is 0; if the real-time uptime rate is 60%≤X<70%, the corresponding parameter adjustment value is a; if the real-time uptime rate is 70%≤X<80%, the corresponding parameter adjustment value is 2a; if the real-time uptime rate is 80%≤X<90%, the corresponding parameter adjustment value is 3a; if the real-time uptime rate is X≥90%, the corresponding parameter adjustment value is b.

[0035] When the ambient temperature is within the range of 20℃≤te<26℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate is X<50%, the corresponding parameter adjustment value is 0; if the real-time uptime rate is 50%≤X<60%, the corresponding parameter adjustment value is a; if the real-time uptime rate is 60%≤X<70%, the corresponding parameter adjustment value is 2a; if the real-time uptime rate is 70%≤X<80%, the corresponding parameter adjustment value is 3a; if the real-time uptime rate is 80%≤X<90%, the corresponding parameter adjustment value is 4a; if the real-time uptime rate is X≥90%, the corresponding parameter adjustment value is b.

[0036] When the ambient temperature is within the range of 14℃≤te<20℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate is X<40%, the corresponding parameter adjustment value is 0; if the real-time uptime rate is 40%≤X<50%, the corresponding parameter adjustment value is a; if the real-time uptime rate is 50%≤X<60%, the corresponding parameter adjustment value is 2a; if the real-time uptime rate is 60%≤X<70%, the corresponding parameter adjustment value is 3a; if the real-time uptime rate is 70%≤X<80%, the corresponding parameter adjustment value is 4a; if the real-time uptime rate is 80%≤X<90%, the corresponding parameter adjustment value is 5a; if the real-time uptime rate is X≥90%, the corresponding parameter adjustment value is b.

[0037] When the ambient temperature is within the range of te < 14℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate is X < 30%, the corresponding parameter adjustment value is 0; if the real-time uptime rate is 30% ≤ X < 40%, the corresponding parameter adjustment value is a; if the real-time uptime rate is 40% ≤ X < 50%, the corresponding parameter adjustment value is 2a; if the real-time uptime rate is 50% ≤ X < 60%, the corresponding parameter adjustment value is 3a; if the real-time uptime rate is 60% ≤ X < 70%, the corresponding parameter adjustment value is 4a; if the real-time uptime rate is 70% ≤ X < 80%, the corresponding parameter adjustment value is 5a; if the real-time uptime rate is 80% ≤ X < 90%, the corresponding parameter adjustment value is 6a; if the real-time uptime rate is X ≥ 90%, the corresponding parameter adjustment value is b.

[0038] Where te is the ambient temperature, X is the real-time uptime rate; a is the preset operating parameter value, and b = a max -a0; a max is the preset maximum operating parameter, and a0 is the operating parameter at startup.

[0039] As an improvement to the above scheme, the operating rate of the previous start-stop cycle is calculated using the following formula:

[0040]

[0041] The real-time uptime rate for the current start-up / shutdown cycle is calculated using the following formula:

[0042]

[0043] Where X′ is the operating rate of the previous start / stop cycle, X is the real-time operating rate of the current start / stop cycle, and T′ on The startup duration of the previous start-stop cycle, T′ off T represents the downtime of the previous start-stop cycle. on This represents the running time during the current start / stop cycle.

[0044] As an improvement to the above solution, the refrigerator further includes:

[0045] A start / stop controller is located in the refrigerator body and connected to the controller. It is used to send a start signal of the inverter compressor to the controller when a preset start-up condition is met, and to send a stop signal of the inverter compressor to the controller when a preset stop condition is met.

[0046] The controller is further configured to: control the variable frequency compressor to start operation according to the variable frequency compressor start-up signal; and control the variable frequency compressor to stop operation according to the variable frequency compressor stop-down signal.

[0047] This invention also provides a control method for a variable frequency compressor of a refrigerator, the refrigerator including a variable frequency compressor and an ambient temperature sensor for detecting the current ambient temperature;

[0048] The method includes:

[0049] After the variable frequency compressor is powered on, preset operating parameters are acquired as the operating parameters of the variable frequency compressor in the first start-stop cycle;

[0050] In non-first start-stop cycles, the start-stop threshold condition corresponding to the current ambient temperature is determined based on the preset correspondence between ambient temperature and start-up rate threshold condition. The operating parameters of the variable frequency compressor at startup are determined based on the relationship between the start-up rate of the previous start-stop cycle and the start-up rate threshold condition.

[0051] Based on the preset correspondence between ambient temperature and operating parameter adjustment strategies, the operating parameter adjustment strategy corresponding to the current ambient temperature is determined. Based on the relationship between the real-time start-up rate of the current start-up / shutdown cycle and the operating parameter adjustment strategy, the corresponding parameter adjustment value is determined, and the current operating parameters are adjusted according to the parameter adjustment value. The operating parameter adjustment strategy includes the correspondence between the real-time start-up rate and the parameter adjustment value.

[0052] Compared with the prior art, the control method of the refrigerator and its inverter compressor disclosed in this invention obtains preset operating parameters as the operating parameters of the inverter compressor in the first start-stop cycle after the inverter compressor is powered on; in non-first start-stop cycles, the operating parameters when the inverter compressor starts are determined according to the preset correspondence between ambient temperature and start-up rate threshold conditions; the operating parameters when the inverter compressor starts are determined according to the relationship between the start-up rate of the previous start-stop cycle and the start-up rate threshold conditions; the operating parameter adjustment strategy corresponding to the current ambient temperature is determined according to the preset correspondence between ambient temperature and operating parameter adjustment strategy, and then the corresponding parameter adjustment value is determined, and the current operating parameters are adjusted according to the parameter adjustment value.

[0053] By employing the technical means of this invention, the influence of ambient temperature on the operating state of the variable frequency compressor can be effectively considered, and a corresponding control strategy can be determined based on the current ambient temperature. Under different control strategies, the operating state of the variable frequency compressor in the previous start-stop cycle and the changes in operating state during the current operation can be comprehensively considered. The operating parameters of the variable frequency compressor can be adjusted in real time according to the instantaneous changes in operating state, so that the variable frequency compressor can reach a better working efficiency more quickly and always maintain a better working state. This effectively improves the stability of the refrigerator during operation, reduces energy consumption during refrigerator operation, and achieves energy saving and emission reduction effects. Furthermore, the refrigerator does not require many additional sensors, which can effectively save refrigerator production costs. It also has the advantages of simple operation, convenient maintenance, and improved refrigerator service life, thus providing users with a good user experience. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of a preferred embodiment of the refrigerator provided in this invention;

[0055] Figure 2 This is a flowchart illustrating the work performed by the refrigerator controller in a preferred embodiment of the present invention.

[0056] Figure 3 This is a schematic diagram of the refrigerator provided in another preferred embodiment of the present invention;

[0057] Figure 4 This is a flowchart illustrating a preferred embodiment of determining the operating parameters at startup during the first start-stop cycle in this invention.

[0058] Figure 5 This is a flowchart illustrating another preferred embodiment of determining the operating parameters at startup during the first start-stop cycle in this invention.

[0059] Figure 6 This is a schematic diagram of the control timing of the inverter compressor of the refrigerator in an embodiment of the present invention;

[0060] Figure 7 This is a flowchart illustrating a preferred embodiment of determining the operating parameters at startup during a non-first start-stop cycle in this invention.

[0061] Figure 8 This is a flowchart illustrating another preferred implementation of determining the operating parameters at startup under a non-first start-stop cycle in this invention.

[0062] Figure 9This is a flowchart illustrating an optional implementation method for determining the current operating parameters in a non-first start-stop cycle according to an embodiment of the present invention.

[0063] Figure 10 This is a flowchart illustrating a preferred embodiment of the control method for the inverter compressor of a refrigerator provided in this invention. Detailed Implementation

[0064] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0065] See Figure 1 This is a structural schematic diagram of a preferred embodiment of the refrigerator provided in this invention. In this embodiment, the refrigerator 10 includes a cabinet, the cabinet having at least one storage compartment, and the refrigerator also includes a refrigeration system.

[0066] Specifically, the storage compartment is a refrigerator compartment and / or a freezer compartment, used to store items that need to be preserved or frozen, such as food, wine, or medicine. The refrigeration system is used to perform refrigeration operations. The refrigerator 10 performs refrigeration operations through the refrigeration system, providing cold air to the storage compartment to maintain the storage compartment at a constant low temperature. The refrigeration system of the refrigerator described in this embodiment of the invention consists of a compressor, a condenser, a dryer filter, a capillary tube, and an evaporator. The working process of the refrigeration system includes a compression process, a condensation process, a throttling process, and an evaporation process.

[0067] The compression process is as follows: When the refrigerator power cord is plugged in and the thermostat contacts are closed, the compressor starts working. Low-temperature, low-pressure refrigerant is drawn into the compressor and compressed into high-temperature, high-pressure superheated gas in the compressor cylinder before being discharged into the condenser. The condensation process is as follows: The high-temperature, high-pressure refrigerant gas dissipates heat through the condenser, and its temperature continuously decreases until it is gradually cooled into room-temperature, high-pressure saturated vapor, and further cooled into saturated liquid. The temperature at this point is no longer decreasing; this temperature is called the condensation temperature. The pressure of the refrigerant remains almost constant throughout the condensation process. The throttling process is as follows: After condensation, the saturated refrigerant liquid is filtered through a dryer to remove moisture and impurities before flowing into a capillary tube, where it undergoes throttling and pressure reduction, turning the refrigerant into room-temperature, low-pressure wet vapor. The evaporation process is as follows: Subsequently, the refrigerant begins to absorb heat and vaporize in the evaporator, which not only lowers the temperature of the evaporator and its surroundings but also turns the refrigerant into a low-temperature, low-pressure gas. The refrigerant exiting the evaporator returns to the compressor, repeating the above process to transfer heat from inside the refrigerator to the outside air, thus achieving the purpose of refrigeration.

[0068] Preferably, the compressor in the refrigeration system is an inverter compressor 11, and the refrigerator also includes an ambient temperature sensor 12 and a controller 13. The temperature sensor 12 is used to detect the current ambient temperature, that is, the ambient temperature of the area where the refrigerator 10 is located.

[0069] The controller 13 is connected to the variable frequency compressor 11 and the ambient temperature sensor 12. The controller 13 obtains the current ambient temperature detected in real time by the ambient temperature sensor 12 through communication with the ambient temperature sensor 12 for subsequent calculations. The controller 13 sends corresponding control commands to the variable frequency compressor 11 through communication with the variable frequency compressor 11 to control the operating status of the variable frequency compressor.

[0070] Specifically, see Figure 2 This is a flowchart illustrating the operation performed by the refrigerator controller in a preferred embodiment of the present invention. The operation performed by the controller 13 includes steps S11 to S14:

[0071] S11. After the variable frequency compressor is powered on, the preset operating parameters are obtained as the operating parameters of the variable frequency compressor in the first start-stop cycle;

[0072] S12. In non-first start-stop cycles, determine the start-up rate threshold condition corresponding to the current ambient temperature based on the preset correspondence between ambient temperature and start-up rate threshold condition, and determine the operating parameters of the variable frequency compressor when starting based on the relationship between the start-up rate of the previous start-stop cycle and the start-up rate threshold condition.

[0073] S13. Based on the preset correspondence between ambient temperature and operating parameter adjustment strategies, determine the operating parameter adjustment strategy corresponding to the current ambient temperature. Based on the real-time start-up rate of the current start-up / shutdown cycle and the operating parameter adjustment strategy, determine the corresponding parameter adjustment value, and adjust the current operating parameters according to the parameter adjustment value. The operating parameter adjustment strategy includes the correspondence between the real-time start-up rate and the parameter adjustment value.

[0074] After the variable frequency compressor is powered on, corresponding start-up or stop conditions are preset to trigger the controller 13 to control the variable frequency compressor 11 to start when the start-up condition is met, that is, to start running, and to control the variable frequency compressor 11 to stop when the stop condition is met, that is, to stop running. Then, when the start-up condition is met again, the controller controls the variable frequency compressor 11 to start running again, and so on in a cycle.

[0075] It should be noted that the start-stop cycle of the variable frequency compressor refers to the sum of the start-up time and the stop time of a single operation, that is, the duration from the start-up time to the next start-up time. Understandably, in this embodiment of the invention, the start-up and stop times of different start-stop cycles are not necessarily equal.

[0076] For a preferred embodiment, see Figure 3 This is a schematic diagram of the refrigerator provided in another preferred embodiment of the present invention. In this embodiment, the refrigerator 10 further includes a start / stop controller 14.

[0077] The start-stop controller 14 is located in the refrigerator and connected to the controller 13. The start-stop controller 14 is used to: send a start signal to the controller 13 for the inverter compressor when a preset start-up condition is met, and send a stop signal to the controller 13 for the inverter compressor when a preset stop condition is met;

[0078] The controller 13 is further configured to: control the variable frequency compressor 11 to start operation according to the variable frequency compressor start-up signal; and control the variable frequency compressor 11 to stop operation according to the variable frequency compressor stop signal.

[0079] Preferably, the start / stop controller 14 is a temperature controller; the temperature controller closes when a preset start-up temperature is reached to send a start-up signal to the variable frequency compressor, and opens when a preset stop-down temperature is reached to send a stop signal to the variable frequency compressor.

[0080] Specifically, see Figure 3One end of the temperature controller is connected to the power cord, and the other end is connected to the control port P of the inverter board. When the temperature controller is disconnected, the control port P of the inverter board will receive a low-level signal, thereby obtaining the shutdown signal of the inverter compressor; when the temperature controller is closed, the control port P of the inverter board will receive a high-level signal, thereby obtaining the start-up signal of the inverter compressor.

[0081] The technical means of this invention employs a temperature controller to achieve start-stop control of the variable frequency compressor, and the control logic is simple and effective.

[0082] Furthermore, in this embodiment of the invention, after the variable frequency compressor 11 is first powered on, it starts running and enters the first start-stop cycle when the preset start-up conditions are met. It then stops running under preset stop conditions, ending the first start-stop cycle. During the first start-stop cycle, the variable frequency compressor is not yet in a stable operating state. By acquiring the preset operating parameters, the variable frequency compressor 11 is controlled to operate according to the currently determined operating parameters. When the preset stop conditions are met, the variable frequency compressor stops running, ending the first start-stop cycle. It is understood that there may be more than one preset operating parameter value, and the operating parameters of the variable frequency compressor 11 can be adjusted and changed at any time during the start-up process.

[0083] Next, when the preset start-up conditions are met again, the variable frequency compressor enters its second start-stop cycle, i.e., a cycle other than the first start-stop cycle. At this time, the operating state of the variable frequency compressor is significantly affected by the combined influence of the ambient temperature and the operating state of the previous start-stop cycle. The controller 13, based on the currently acquired ambient temperature *te*, calls the preset correspondence between ambient temperature and start-up rate threshold conditions to query the corresponding start-up rate threshold condition. The start-up rate threshold condition includes a preset start-up rate threshold range; different ambient temperatures correspond to different start-up rate threshold conditions, and the corresponding start-up rate threshold ranges are also different. Furthermore, based on whether the start-up rate of the previous start-stop cycle meets the start-up rate threshold condition, i.e., whether it falls within the start-up rate threshold range, the operating parameters *S* for starting the variable frequency compressor are determined. Then, the variable frequency compressor 11 starts operating according to the starting operating parameters *S*.

[0084] Furthermore, during the operation of the variable frequency compressor 11, the controller 13 determines the operating parameter adjustment strategy corresponding to the current ambient temperature based on the preset correspondence between ambient temperature and operating parameter adjustment strategy; wherein, the operating parameter adjustment strategy includes the correspondence between real-time start-up rate and parameter adjustment value. The controller 13 calculates the real-time start-up rate X of the variable frequency compressor 11 in the current start-up / shutdown cycle in real time, and determines the corresponding parameter adjustment value based on the magnitude of the real-time start-up rate X and the operating parameter adjustment strategy, adjusts the current operating parameters according to the parameter adjustment value, and controls the variable frequency compressor 11 to operate according to the currently determined operating parameters in real time until it stops.

[0085] Next, after the variable frequency compressor stops running, it enters its third start-stop cycle after the preset start-up conditions are met again. At this time, the controller determines the operating parameters of the variable frequency compressor when it starts up in the current start-stop cycle according to the above control strategy, and adjusts the operating parameters in real time, which will not be elaborated here.

[0086] This invention provides a refrigerator, including a variable frequency compressor, an ambient temperature sensor, and a controller. The controller is configured to: after the variable frequency compressor is powered on, acquire preset operating parameters as the operating parameters of the variable frequency compressor during the first start-stop cycle; during non-first start-stop cycles, determine the start-stop rate threshold condition corresponding to the current ambient temperature based on the preset correspondence between ambient temperature and start-up rate threshold condition, and determine the operating parameters of the variable frequency compressor when it starts based on the relationship between the start-up rate of the previous start-stop cycle and the start-up rate threshold condition; determine the operating parameter adjustment strategy corresponding to the current ambient temperature based on the preset correspondence between ambient temperature and operating parameter adjustment strategy, thereby determining the corresponding parameter adjustment value, and adjusting the current operating parameters based on the parameter adjustment value.

[0087] By employing the technical means of this invention, the influence of ambient temperature on the operating state of the variable frequency compressor can be effectively considered, and a corresponding control strategy can be determined based on the current ambient temperature. Under different control strategies, the operating state of the variable frequency compressor in the previous start-stop cycle and the changes in operating state during the current operation can be comprehensively considered. The operating parameters of the variable frequency compressor can be adjusted in real time according to the instantaneous changes in operating state, so that the variable frequency compressor can reach a better working efficiency more quickly and always maintain a better working state. This effectively improves the stability of the refrigerator during operation, reduces energy consumption during refrigerator operation, and achieves energy saving and emission reduction effects. Furthermore, the refrigerator does not require many additional sensors, which can effectively save refrigerator production costs. It also has the advantages of simple operation, convenient maintenance, and improved refrigerator service life, thus providing users with a good user experience.

[0088] For a preferred embodiment, see Figure 4 This is a flowchart illustrating a preferred embodiment of determining the operating parameters during startup in the first start-stop cycle of this invention. Based on the above embodiment, step S11, which involves acquiring preset operating parameters as the operating parameters of the variable frequency compressor in the first start-stop cycle after the variable frequency compressor is powered on, specifically includes steps S111 to S113:

[0089] S111. After the variable frequency compressor is powered on, the variable frequency compressor enters the first start-stop cycle, obtains the preset first operating parameters, and controls the variable frequency compressor to run with the first operating parameters during the start-up process.

[0090] S112. In real time, determine whether the start-up time of the variable frequency compressor has reached the preset time under the current start-up and stop cycle;

[0091] S113. When the start-up time of the variable frequency compressor reaches the preset time, the preset maximum operating parameters are obtained, and the variable frequency compressor is controlled to run at the maximum operating parameters during the start-up process.

[0092] In this embodiment of the invention, during the first start-stop cycle of the variable frequency compressor 11, a preset first operating parameter is obtained as the operating parameter when the variable frequency compressor 11 starts, and the controller continues to operate the variable frequency compressor 11 according to the first operating parameter after it starts running.

[0093] In order to avoid the incompatibility between the preset first operating parameters and the current operating environment and operating conditions of the variable frequency compressor, which would cause the variable frequency compressor to run continuously for a long time, in this embodiment of the invention, when it is detected that the continuous running time of the variable frequency compressor 11 according to the first operating parameters reaches the preset duration and it still has not stopped, the current operating parameters of the variable frequency compressor 11 are adjusted to the preset maximum operating parameters and run until the compressor stops.

[0094] Preferably, the operating parameters include operating speed or operating frequency. The operating speed corresponds to the operating frequency; that is, when the variable frequency compressor operates at a certain operating speed, it has a corresponding operating frequency.

[0095] Specifically, taking the operating parameter as the operating speed as an example, the first operating parameter is set to: operating speed 3000 RPM, corresponding to an operating frequency of 100 Hz. The preset duration is set to 5 hours, and the maximum operating parameter is set to: operating speed 4200 RPM, corresponding to an operating frequency of 140 Hz. See also Figure 5 and Figure 6 , Figure 5This is a flowchart illustrating another preferred embodiment of determining the operating parameters at startup during the first start-stop cycle in this invention. Figure 6 This is a schematic diagram of the control timing of the inverter compressor in the refrigerator according to an embodiment of the present invention. After the inverter compressor 11 is powered on, when the preset start-up conditions are met, the controller 13 controls the inverter compressor 11 to start running at an operating speed r = 3000 RPM, corresponding to an operating frequency f = 100 Hz, that is... Figure 6 Section A. During the near-death experience of the variable frequency compressor, the running time is monitored in real time. If the continuous running time reaches 5 hours and the shutdown condition is not met, the controller 13 controls the variable frequency compressor 11 to operate at a running speed r = 4200 RPM, corresponding to an operating frequency f = 140 Hz. Figure 6 Section B in the diagram. It operates at maximum parameters until the variable frequency compressor 11 stops. After stopping, it... Figure 6 Section C in the text.

[0096] Understandably, the above scenario is only an example, and the first operating parameter, the maximum operating parameter and the preset duration can be set and adjusted according to the actual situation without affecting the beneficial effects achieved by the present invention.

[0097] Using the technical means of this invention, during the first start-stop cycle of the variable frequency compressor, the start-up and operation of the variable frequency compressor are controlled by preset operating parameters. In order to avoid the variable frequency compressor from running continuously for a long time, the variable frequency compressor is controlled to operate at the highest operating parameters after a certain period of time to ensure the normal start-up and shutdown of the variable frequency compressor.

[0098] In a preferred embodiment, the correspondence between the preset ambient temperature and the power-on rate threshold conditions specifically includes:

[0099] When the ambient temperature is within the range of te≥38℃, the corresponding start-up rate threshold condition is: the start-up rate of the previous start-up / stop cycle is within the start-up rate threshold range of 85%≤X′≤90%.

[0100] When the ambient temperature is within the range of 32℃≤te<38℃, the corresponding start-up rate threshold condition is: the start-up rate of the previous start-up / stop cycle is within the start-up rate threshold range of 80%≤X′≤85%.

[0101] When the ambient temperature is within the range of 26℃≤te<32℃, the corresponding start-up rate threshold condition is: the start-up rate of the previous start-up / stop cycle is within the start-up rate threshold range of 70%≤X′≤75%.

[0102] When the ambient temperature is within the range of 20℃≤te<26℃, the corresponding start-up rate threshold condition is: the start-up rate of the previous start-up / stop cycle is within the start-up rate threshold range of 60%≤X′≤65%.

[0103] When the ambient temperature is within the range of 14℃≤te<20℃, the corresponding start-up rate threshold condition is: the start-up rate of the previous start-up / stop cycle is within the start-up rate threshold range of 50%≤X′≤55%.

[0104] When the ambient temperature is within the range of te < 14℃, the corresponding start-up rate threshold condition is: the start-up rate of the previous start-up / stop cycle is within the start-up rate threshold range of 40% ≤ X′ ≤ 45%.

[0105] Where te is the ambient temperature and X′ is the operating rate of the previous start-stop cycle.

[0106] The details are shown in Table 1:

[0107] Ambient temperature (te) Startup rate threshold conditions te≥38℃ 85％≤X′≤90％ 32℃≤te<38℃ 80％≤X′≤85％ 26℃≤te<32℃ 70％≤X′≤75％ 20℃≤te<26℃ 60％≤X′≤65％ 14℃≤te<20℃ 50％≤X′≤55％ te < 14℃ 40％≤X′≤45％

[0108] Further, see Figure 7 This is a flowchart illustrating a preferred embodiment of determining the operating parameters during startup in a non-first start-stop cycle according to an embodiment of the present invention. In step S12, determining the operating parameters for startup of the variable frequency compressor based on the relationship between the start-up rate of the previous start-stop cycle and the start-up rate threshold condition specifically includes steps S121 to S122:

[0109] S121. When the start-up rate of the previous start-up / stop cycle meets the start-up rate threshold condition, the operating parameters of the variable frequency compressor when starting up in the current start-up / stop cycle are determined to be the operating parameters of the variable frequency compressor when starting up in the previous start-up / stop cycle.

[0110] S122. When the start-up rate of the previous start-up / stop cycle does not meet the start-up rate threshold condition, the operating parameters of the variable frequency compressor when starting in the previous start-up / stop cycle are adjusted according to the preset operating parameter adjustment step size, so as to determine the operating parameters of the variable frequency compressor when starting in the current start-up / stop cycle.

[0111] In this embodiment of the invention, when the variable frequency compressor 11 enters a non-first start-stop cycle, the controller 13 obtains the current ambient temperature te, and determines the temperature range into which the current ambient temperature te falls according to the preset correspondence between the ambient temperature and the start-up rate threshold condition, thereby determining the corresponding start-up rate condition, obtaining the corresponding start-up rate threshold range, and then determining whether the start-up rate of the previous start-stop cycle falls within the start-up rate threshold range, so as to determine the operating parameters when starting the current start-stop cycle.

[0112] As an example, assuming the current ambient temperature te = 30℃, which falls within the temperature range of 26℃ ≤ te < 32℃, the corresponding start-up rate condition is determined as follows: the start-up rate of the previous start-up / shutdown cycle is within the start-up rate threshold range of 70% ≤ X′ ≤ 75%.

[0113] Furthermore, the controller 13 acquires the power-on duration T′ of the previous start-stop cycle. on And downtime T′ off Calculate the operating rate X′ of the previous start-stop cycle:

[0114]

[0115] Where X′ is the operating rate of the previous start / stop cycle, and T′ on The startup duration of the previous start-stop cycle, T′ off The downtime duration of the previous start-stop cycle.

[0116] If the calculated start-up rate X′ of the previous start-up / shutdown cycle satisfies 70% ≤ X′ ≤ 75%, then the operating parameter S′ at the start of the previous start-up / shutdown cycle will be used as the operating parameter S at the start of the current start-up / shutdown cycle.

[0117] If the calculated start-up rate of the previous start-up / shutdown cycle does not meet the start-up rate threshold condition, for example, if X′ < 70% or X′ > 75%, then the operating parameter S′ at the start of the previous start-up / shutdown cycle needs to be adjusted downward or upward to determine the operating parameter S at the start of the current start-up / shutdown cycle.

[0118] Specifically, step S122 includes:

[0119] When the start-up rate of the previous start-up / stop cycle is less than the lower limit of the start-up rate threshold range corresponding to the start-up rate threshold condition, the operating parameters of the variable frequency compressor when it starts in the previous start-up / stop cycle are reduced by the preset operating parameter adjustment step size.

[0120] When the start-up rate of the previous start-up / stop cycle is greater than the upper limit of the start-up rate threshold range corresponding to the start-up rate threshold condition, the operating parameters of the variable frequency compressor when it starts up in the previous start-up / stop cycle are increased by the preset operating parameter adjustment step size.

[0121] The preset operating parameter adjustment step size can be set according to the actual situation, and is not limited here.

[0122] For example, the operating parameters include the operating speed, and the preset operating parameter adjustment step size includes the operating speed adjustment step size, wherein the operating speed adjustment step size is 300 RPM.

[0123] See Figure 8This is a flowchart illustrating another preferred implementation of determining the operating parameters during startup in a non-first start-stop cycle according to an embodiment of the present invention. Taking the current ambient temperature satisfying 26℃≤te<32℃ as an example, the startup rate threshold range is determined to be 70%≤X′≤75%.

[0124] When the operating rate X′ satisfies 70%≤X′≤75%, the starting speed r0 of the variable frequency compressor in the current start-stop cycle is determined to be the starting speed r′ of the previous start-stop cycle, and the variable frequency compressor is controlled to start and run at the operating speed r′.

[0125] When the operating rate X′ satisfies X′<70%, the starting speed r0=(r′-300)RPM of the variable frequency compressor under the current start-stop cycle is determined, and the variable frequency compressor is controlled to start and run at the operating speed.

[0126] When the operating rate X′ satisfies X′>75%, the starting speed of the variable frequency compressor under the current start-stop cycle is determined to be r0=(r′+300)RPM, and the variable frequency compressor is controlled to start and run at the operating speed.

[0127] In a preferred embodiment, the correspondence between the preset ambient temperature and the operating parameter adjustment strategy specifically includes:

[0128] When the ambient temperature is within the range of te≥38℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate is X<75%, the corresponding parameter adjustment value is 0; if the real-time uptime rate is 75%≤X<85%, the corresponding parameter adjustment value is a; if the real-time uptime rate is 85%≤X<90%, the corresponding parameter adjustment value is 2a; if the real-time uptime rate is X≥90%, the corresponding parameter adjustment value is b.

[0129] When the ambient temperature is within the range of 32℃≤te<38℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate is X<70%, the corresponding parameter adjustment value is 0; if the real-time uptime rate is 70%≤X<80%, the corresponding parameter adjustment value is a; if the real-time uptime rate is 80%≤X<90%, the corresponding parameter adjustment value is 2a; if the real-time uptime rate is X≥90%, the corresponding parameter adjustment value is b.

[0130] When the ambient temperature is within the range of 26℃≤te<32℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate is X<60%, the corresponding parameter adjustment value is 0; if the real-time uptime rate is 60%≤X<70%, the corresponding parameter adjustment value is a; if the real-time uptime rate is 70%≤X<80%, the corresponding parameter adjustment value is 2a; if the real-time uptime rate is 80%≤X<90%, the corresponding parameter adjustment value is 3a; if the real-time uptime rate is X≥90%, the corresponding parameter adjustment value is b.

[0131] When the ambient temperature is within the range of 20℃≤te<26℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate is X<50%, the corresponding parameter adjustment value is 0; if the real-time uptime rate is 50%≤X<60%, the corresponding parameter adjustment value is a; if the real-time uptime rate is 60%≤X<70%, the corresponding parameter adjustment value is 2a; if the real-time uptime rate is 70%≤X<80%, the corresponding parameter adjustment value is 3a; if the real-time uptime rate is 80%≤X<90%, the corresponding parameter adjustment value is 4a; if the real-time uptime rate is X≥90%, the corresponding parameter adjustment value is b.

[0132] When the ambient temperature is within the range of 14℃≤te<20℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate is X<40%, the corresponding parameter adjustment value is 0; if the real-time uptime rate is 40%≤X<50%, the corresponding parameter adjustment value is a; if the real-time uptime rate is 50%≤X<60%, the corresponding parameter adjustment value is 2a; if the real-time uptime rate is 60%≤X<70%, the corresponding parameter adjustment value is 3a; if the real-time uptime rate is 70%≤X<80%, the corresponding parameter adjustment value is 4a; if the real-time uptime rate is 80%≤X<90%, the corresponding parameter adjustment value is 5a; if the real-time uptime rate is X≥90%, the corresponding parameter adjustment value is b.

[0133] When the ambient temperature is within the range of te < 14℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate is X < 30%, the corresponding parameter adjustment value is 0; if the real-time uptime rate is 30% ≤ X < 40%, the corresponding parameter adjustment value is a; if the real-time uptime rate is 40% ≤ X < 50%, the corresponding parameter adjustment value is 2a; if the real-time uptime rate is 50% ≤ X < 60%, the corresponding parameter adjustment value is 3a; if the real-time uptime rate is 60% ≤ X < 70%, the corresponding parameter adjustment value is 4a; if the real-time uptime rate is 70% ≤ X < 80%, the corresponding parameter adjustment value is 5a; if the real-time uptime rate is 80% ≤ X < 90%, the corresponding parameter adjustment value is 6a; if the real-time uptime rate is X ≥ 90%, the corresponding parameter adjustment value is b.

[0134] Where te is the ambient temperature, X is the real-time uptime rate; a is the preset operating parameter value, and b = a max-a0; a max is the preset maximum operating parameter, and a0 is the operating parameter at startup.

[0135] In this embodiment of the invention, after determining the operating parameters of the variable frequency compressor when it starts and controlling the variable frequency compressor to start running according to the starting operating parameters, the controller 13 determines the corresponding operating parameter adjustment strategy based on the current ambient temperature te, so as to further adjust the operating parameters of the variable frequency compressor 11 under the current start-stop cycle.

[0136] Meanwhile, the controller 13 acquires in real time the running time T of the variable frequency compressor under the current start-stop cycle. on This is used to calculate the real-time uptime rate X for the current start-up / shutdown cycle.

[0137] Preferably, the calculation of the real-time uptime rate for the current start-up / shutdown cycle specifically includes:

[0138] Real-time acquisition of the running time T of the variable frequency compressor under the current start-stop cycle. on ;

[0139] Based on the running time T on The downtime T′ under the previous start-stop cycle off The real-time uptime rate X for the current start-up / shutdown cycle is calculated using the following formula:

[0140]

[0141] Where X is the real-time on-time rate of the current start / stop cycle, and T′ off T represents the downtime of the previous start-stop cycle. on This represents the running time during the current start / stop cycle.

[0142] Then, the controller 13 determines the parameter adjustment value at the current moment based on the calculated real-time start-up rate X and the operating parameter adjustment strategy. Then, based on the parameter adjustment value, the operating parameters at startup are adjusted to obtain the current operating parameters, and the variable frequency compressor 11 is controlled to operate with the current operating parameters.

[0143] Preferably, the operating parameters include the operating speed, and the parameter adjustment value includes the operating speed adjustment value; the correspondence between the preset ambient temperature and the operating parameter adjustment strategy specifically includes:

[0144] When the ambient temperature is within the range of te≥38℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate is X<75%, the corresponding operating speed adjustment value is 0 RPM; if the real-time uptime rate is 75%≤X<85%, the corresponding operating speed adjustment value is 300 RPM; if the real-time uptime rate is 85%≤X<90%, the corresponding operating speed adjustment value is 600 RPM; if the real-time uptime rate is X≥90%, the corresponding operating speed adjustment value is n RPM.

[0145] When the ambient temperature is within the range of 32℃≤te<38℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate is X<70%, the corresponding operating speed adjustment value is 0 RPM; if the real-time uptime rate is 70%≤X<80%, the corresponding operating speed adjustment value is 300 RPM; if the real-time uptime rate is 80%≤X<90%, the corresponding operating speed adjustment value is 600 RPM; if the real-time uptime rate is X≥90%, the corresponding operating speed adjustment value is n RPM.

[0146] When the ambient temperature is within the range of 26℃≤te<32℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate X<60%, the corresponding operating speed adjustment value is 0 RPM; if the real-time uptime rate 60%≤X<70%, the corresponding operating speed adjustment value is 300 RPM; if the real-time uptime rate 70%≤X<80%, the corresponding operating speed adjustment value is 600 RPM; if the real-time uptime rate 80%≤X<90%, the corresponding operating speed adjustment value is 900 RPM; if the real-time uptime rate X≥90%, the corresponding operating speed adjustment value is n RPM.

[0147] When the ambient temperature is within the range of 20℃≤te<26℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate X<50%, the corresponding operating speed adjustment value is 0 RPM; if the real-time uptime rate 50%≤X<60%, the corresponding operating speed adjustment value is 300 RPM; if the real-time uptime rate 60%≤X<70%, the corresponding operating speed adjustment value is 600 RPM; if the real-time uptime rate 70%≤X<80%, the corresponding operating speed adjustment value is 900 RPM; if the real-time uptime rate 80%≤X<90%, the corresponding operating speed adjustment value is 1200 RPM; if the real-time uptime rate X≥90%, the corresponding operating speed adjustment value is n RPM.

[0148] When the ambient temperature is within the range of 14℃≤te<20℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate X<40%, the corresponding operating speed adjustment value is 0 RPM; if the real-time uptime rate 40%≤X<50%, the corresponding operating speed adjustment value is 300 RPM; if the real-time uptime rate 50%≤X<60%, the corresponding operating speed adjustment value is 600 RPM; if the real-time uptime rate 60%≤X<70%, the corresponding operating speed adjustment value is 900 RPM; if the real-time uptime rate 70%≤X<80%, the corresponding operating speed adjustment value is 1200 RPM; if the real-time uptime rate 80%≤X<90%, the corresponding operating speed adjustment value is 1500 RPM; if the real-time uptime rate X≥90%, the corresponding operating speed adjustment value is n RPM.

[0149] When the ambient temperature is within the range of te < 14℃, the corresponding operating parameter adjustment strategy is as follows: If the real-time uptime rate is X < 30%, the corresponding operating speed adjustment value is 0 RPM; if the real-time uptime rate is 30% ≤ X < 40%, the corresponding operating speed adjustment value is 300 RPM; if the real-time uptime rate is 40% ≤ X < 50%, the corresponding operating speed adjustment value is 600 RPM; if the real-time uptime rate is 50% ≤ X < 60%, the corresponding operating speed adjustment value is 900 RPM; if the real-time uptime rate is 60% ≤ X < 70%, the corresponding operating speed adjustment value is 1200 RPM; if the real-time uptime rate is 70% ≤ X < 80%, the corresponding operating speed adjustment value is 1500 RPM; if the real-time uptime rate is 80% ≤ X < 90%, the corresponding operating speed adjustment value is 1800 RPM; if the real-time uptime rate is X ≥ 90%, the corresponding operating speed adjustment value is n RPM.

[0150] Where te is the ambient temperature, X is the real-time uptime rate; n = r max -r0; r max r0 is the preset maximum operating speed, and r0 is the operating speed at startup.

[0151] Specifically, see Figure 9This is a flowchart illustrating an optional implementation of determining the current operating parameters under a non-first start-stop cycle in this invention. Taking the operating parameter as the operating speed as an example, assuming the current ambient temperature meets 26℃≤te<32℃, the operating parameter adjustment strategy A corresponding to the current ambient temperature is determined as follows: if the real-time start-up rate meets X<60%, the corresponding operating speed adjustment value is 0 RPM; if the real-time start-up rate meets 60%≤X<70%, the corresponding operating speed adjustment value is 300 RPM; if the real-time start-up rate meets 70%≤X<80%, the corresponding operating speed adjustment value is 600 RPM; if the real-time start-up rate meets 80%≤X<90%, the corresponding operating speed adjustment value is 900 RPM; if the real-time start-up rate meets X≥90%, the corresponding operating speed adjustment value is n RPM.

[0152] After the first start-stop cycle ends, when the start-up conditions are met, the variable frequency compressor 11 enters the second start-stop cycle. The operating speed r0 is determined based on the current ambient temperature, and the compressor starts running at operating speed r0. The controller 13 calculates the real-time start-up rate X based on the running time. When the real-time start-up rate satisfies X < 60% (denoted as condition T1), the corresponding operating speed adjustment value is 0. That is, during this period, the variable frequency compressor 11 always runs at operating speed r until it stops. Alternatively, if the real-time start-up rate satisfies 60% ≤ X < 70% (denoted as condition T2), the corresponding operating speed adjustment value is 300 RPM. The variable frequency compressor 11 adjusts to run at the starting operating speed (r0 + 300) RPM, that is, 300 RPM is added to the original operating speed, and it runs until it stops. Or, if the real-time start-up rate satisfies 70% ≤ X... When the real-time operating rate is <80% (denoted as condition T3), the corresponding operating speed adjustment value is 600 RPM. The variable frequency compressor 11 is adjusted to operate at the starting operating speed (r0 + 600) RPM, that is, it operates at the original operating speed plus 300 RPM. Compared to the starting operating speed r0, it operates at 300 RPM twice more, until it stops. Or, when the real-time operating rate meets 80% ≤ X < 90% (denoted as condition T4), the corresponding operating speed adjustment value is 900 RPM. The variable frequency compressor 11 is adjusted to operate at the starting operating speed (r0 + 900) RPM, that is, it operates at the original operating speed plus 300 RPM. Compared to the starting operating speed r0, it operates at 300 RPM three times more, until it stops. Or, when the real-time operating rate meets X ≥ 90% (denoted as condition T5), the corresponding operating speed adjustment value is n RPM. During this period, the variable frequency compressor 11 is adjusted to operate at the maximum operating speed r max The compressor runs until it stops. Once the startup conditions are met again, the variable frequency compressor 11 enters its third start-stop cycle, and so on.

[0153] For example, see Figure 6After the first start-stop cycle ends, when the start-up conditions are met, the start-up rate X′ of the previous start-stop cycle is calculated, corresponding to... Figure 6 Let X′ = (A+B) / (A+B+C). Assuming that 70% ≤ X′ ≤ 75%, the corresponding starting operating speed is determined as the starting operating speed of the first start-stop cycle, specifically 3000 RPM. The variable frequency compressor 11 is controlled to start running at an operating speed of 3000 RPM, entering stage D. At this time, X < 60%, and it runs at the operating speed of 3000 RPM until it is determined that X = D / (C+D) ≥ 60%, and the operating speed is 3000 + 300 = 3300 RPM, which is the current operating speed. That is, it enters stage E. It continues to run until it is determined that X = (D+E) / (C+D+E) ≥ 70%, and the operating speed is 3300 + 300 = 3600 RPM, which is the current operating speed. That is, it enters stage F. It continues to run until the shutdown conditions are met. When it is determined that X = (D+E+F) / (C+D+E+F) < 80%, the variable frequency compressor stops, and it enters stage G.

[0154] Upon the third power-on, the power-on rate X′ from the previous power-on / off cycle is determined again. Figure 6 Let X′ = (D+E+F) / (D+E+F+G). Assuming X′ < 70%, the system operates at the starting speed r - 300 rpm (3000 - 300 = 2700 rpm) of the second start-stop cycle, entering segment H. At this point, X < 60%, and the system operates at the current operating speed of 2700 rpm until it is determined that X = H / (G+H) ≥ 60%. Then, the system operates at the current operating speed of 2700 + 300 = 3000 rpm, entering segment I. This continues until the shutdown conditions are met, entering segment J. Subsequent starts follow this rule, and so on.

[0155] Understandably, the above scenarios are merely examples. In practical applications, it is necessary to determine the corresponding operating parameter adjustment strategy based on the actual ambient temperature, which does not affect the present invention.

[0156] The conditions Tn involved in the adjustment strategies of operating parameters for different ambient temperatures are shown in Table 2:

[0157]

[0158] By employing the technical means of this invention, the operating parameters of the Zeller can be adjusted according to the ambient temperature. When the ambient temperature is high, a higher operating rate is required to prevent the temperature from failing to drop when the operating rate is low; when the ambient temperature is low, a lower operating rate is required to prevent frequent start-ups from increasing power consumption. Furthermore, the operating status changes of the variable frequency compressor during the current operation process can be comprehensively considered, and the operating parameters of the variable frequency compressor can be adjusted in real time to enable the variable frequency compressor to achieve better working efficiency, thereby providing users with a better user experience.

[0159] It should be noted that the variable frequency compressor is pre-set with a preset range of operating parameters, that is, the current operating parameters of the variable frequency compressor must be within the range of operating parameters.

[0160] Therefore, before step S14, the controller 13 is also used to execute steps S01 to S03:

[0161] S01. Determine whether the current operating parameters are within the preset operating parameter limit range.

[0162] S02. When the current operating parameter is greater than the upper limit of the preset operating parameter limit range, the current operating parameter is updated to the upper limit of the preset operating parameter limit range.

[0163] S03. When the current operating parameter is less than the lower limit of the preset operating parameter limit range, the current operating parameter is updated to the lower limit of the preset operating parameter limit range.

[0164] Preferably, the preset operating parameter limit range includes an operating frequency limit range and an operating speed limit range;

[0165] The specific operating frequency limit range is: [40Hz, 140Hz];

[0166] The specific operating speed limit range is: [1200RPM, 4200RPM].

[0167] Among them, the upper limit value f of the operating frequency limit range max =140Hz, lower limit value is f min =40Hz; Upper limit of the operating speed range r max =4200RPM, lower limit value is r min =1200RPM.

[0168] Specifically, in the current operating parameters, when the current operating frequency f > f max When the current operating frequency f is updated to the upper limit value f of the preset operating frequency limit range, the current operating frequency f is updated to the upper limit value f of the preset operating frequency limit range. maxThat is, let the current operating frequency f = f max When the current operating frequency f <f min When the current operating frequency f is updated to the lower limit f of the preset operating frequency limit range, the frequency f is then updated. min That is, let the current operating frequency f = f min Similarly, when the current operating speed r > r max At that time, let the current operating speed r = r max When the current operating speed r <r min At that time, let the current operating speed r = r min .

[0169] By employing the technical means of this invention, it is possible to ensure that the variable frequency compressor operates within a safe and reliable operating parameter range, thereby guaranteeing the normal operation of the refrigerator.

[0170] See Figure 10 This is a flowchart illustrating a preferred embodiment of the control method for the inverter compressor of a refrigerator provided in this invention. This invention also provides a control method for the inverter compressor of a refrigerator, wherein the refrigerator includes an inverter compressor and an ambient temperature sensor for detecting the current ambient temperature; the method is executed through steps S21 to S23:

[0171] S21. After the variable frequency compressor is powered on, the preset operating parameters are obtained as the operating parameters of the variable frequency compressor in the first start-stop cycle;

[0172] S22. In non-first start-stop cycles, determine the start-up rate threshold condition corresponding to the current ambient temperature based on the preset correspondence between ambient temperature and start-up rate threshold condition, and determine the operating parameters of the variable frequency compressor when starting based on the relationship between the start-up rate of the previous start-stop cycle and the start-up rate threshold condition.

[0173] S23. Based on the preset correspondence between ambient temperature and operating parameter adjustment strategies, determine the operating parameter adjustment strategy corresponding to the current ambient temperature; based on the relationship between the real-time start-up rate of the current start-up / shutdown cycle and the operating parameter adjustment strategy, determine the corresponding parameter adjustment value; and adjust the current operating parameters according to the parameter adjustment value; wherein, the operating parameter adjustment strategy includes the correspondence between the real-time start-up rate and the parameter adjustment value.

[0174] By employing the technical means of this invention, the influence of ambient temperature on the operating state of the variable frequency compressor can be effectively considered, and a corresponding control strategy can be determined based on the current ambient temperature. Under different control strategies, the operating state of the variable frequency compressor in the previous start-stop cycle and the changes in operating state during the current operation can be comprehensively considered. The operating parameters of the variable frequency compressor can be adjusted in real time according to the instantaneous changes in operating state, so that the variable frequency compressor can reach a better working efficiency more quickly and always maintain a better working state. This effectively improves the stability of the refrigerator during operation, reduces energy consumption during refrigerator operation, and achieves energy saving and emission reduction effects. Furthermore, the refrigerator does not require many additional sensors, which can effectively save refrigerator production costs. It also has the advantages of simple operation, convenient maintenance, and improved refrigerator service life, thus providing users with a good user experience.

[0175] It should be noted that the control method for the variable frequency compressor of a refrigerator provided in this embodiment of the invention has the same process steps as the controller of a refrigerator in the above embodiment. The working principle and beneficial effects of the two are one-to-one, so they will not be described again.

[0176] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0177] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and 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: Variable frequency compressor; An ambient temperature sensor is used to detect the current ambient temperature. Controller, used for: After the variable frequency compressor is powered on, preset operating parameters are acquired as the operating parameters of the variable frequency compressor in the first start-stop cycle; In non-first start-stop cycles, the start-stop threshold condition corresponding to the current ambient temperature is determined based on the preset correspondence between ambient temperature and start-up rate threshold condition. The operating parameters of the variable frequency compressor at startup are determined based on the relationship between the start-up rate of the previous start-stop cycle and the start-up rate threshold condition. Based on the preset correspondence between ambient temperature and operating parameter adjustment strategies, the operating parameter adjustment strategy corresponding to the current ambient temperature is determined. Based on the real-time start-up rate of the current start-up / shutdown cycle and the operating parameter adjustment strategy, the corresponding parameter adjustment value is determined, and the current operating parameters are adjusted according to the parameter adjustment value. The operating parameter adjustment strategy includes the correspondence between the real-time start-up rate and the parameter adjustment value.

2. The refrigerator as described in claim 1, characterized in that, After the variable frequency compressor is powered on, the process of acquiring preset operating parameters as the operating parameters of the variable frequency compressor in the first start-stop cycle specifically includes: After the variable frequency compressor is powered on, the variable frequency compressor enters the first start-stop cycle, acquires the preset first operating parameters, and controls the variable frequency compressor to run with the first operating parameters during the start-up process; Real-time determination of whether the start-up time of the variable frequency compressor has reached the preset time under the current start-up and stop cycle; When the start-up time of the variable frequency compressor reaches the preset time, the preset maximum operating parameters are obtained, and the variable frequency compressor is controlled to operate at the maximum operating parameters during the start-up process.

3. The refrigerator as described in claim 1, characterized in that, The correspondence between the preset ambient temperature and the power-on rate threshold conditions specifically includes: When the ambient temperature is within the range of te≥38℃, the corresponding start-up rate threshold condition is: the start-up rate of the previous start-up / stop cycle is within the start-up rate threshold range of 85%≤X′≤90%. When the ambient temperature is within the range of 32℃≤te<38℃, the corresponding start-up rate threshold condition is: the start-up rate of the previous start-up / stop cycle is within the start-up rate threshold range of 80%≤X′≤85%. When the ambient temperature is within the range of 26℃≤te<32℃, the corresponding start-up rate threshold condition is: the start-up rate of the previous start-up / stop cycle is within the start-up rate threshold range of 70%≤X′≤75%. When the ambient temperature is within the range of 20℃≤te<26℃, the corresponding start-up rate threshold condition is: the start-up rate of the previous start-up / stop cycle is within the start-up rate threshold range of 60%≤X′≤65%. When the ambient temperature is within the range of 14℃≤te<20℃, the corresponding start-up rate threshold condition is: the start-up rate of the previous start-up / stop cycle is within the start-up rate threshold range of 50%≤X′≤55%. When the ambient temperature is within the range of te < 14℃, the corresponding start-up rate threshold condition is: the start-up rate of the previous start-up / stop cycle is within the start-up rate threshold range of 40% ≤ X′ ≤ 45%. Where te is the ambient temperature and X′ is the operating rate of the previous start-stop cycle.

4. The refrigerator as described in claim 1 or 3, characterized in that, Based on the relationship between the start-up rate of the previous start-up / shutdown cycle and the start-up rate threshold condition, the operating parameters of the variable frequency compressor at startup are determined, specifically including: When the start-up rate of the previous start-up / stop cycle meets the start-up rate threshold condition, the operating parameters of the variable frequency compressor when starting up in the current start-up / stop cycle are determined to be the operating parameters of the variable frequency compressor when starting up in the previous start-up / stop cycle. When the start-up rate of the previous start-up / stop cycle does not meet the start-up rate threshold condition, the operating parameters of the variable frequency compressor when it starts up in the previous start-up / stop cycle are adjusted according to the preset operating parameter adjustment step size, so as to determine the operating parameters of the variable frequency compressor when it starts up in the current start-up / stop cycle.

5. The refrigerator as described in claim 4, characterized in that, When the start-up rate of the previous start-up / shutdown cycle does not meet the start-up rate threshold condition, the operating parameters of the variable frequency compressor during startup in the previous start-up / shutdown cycle are adjusted according to a preset operating parameter adjustment step size, specifically including: When the start-up rate of the previous start-up / stop cycle is less than the lower limit of the start-up rate threshold range corresponding to the start-up rate threshold condition, the operating parameters of the variable frequency compressor when it starts in the previous start-up / stop cycle are reduced by the preset operating parameter adjustment step size. When the start-up rate of the previous start-up / stop cycle is greater than the upper limit of the start-up rate threshold range corresponding to the start-up rate threshold condition, the operating parameters of the variable frequency compressor when it starts up in the previous start-up / stop cycle are increased by the preset operating parameter adjustment step size.

6. The refrigerator as described in claim 5, characterized in that, The operating parameters include the operating speed, and the preset operating parameter adjustment step size includes the operating speed adjustment step size, wherein the operating speed adjustment step size is 300 RPM.

7. The refrigerator as described in claim 1, characterized in that, The correspondence between the preset ambient temperature and the operating parameter adjustment strategy specifically includes: When the ambient temperature is within the range of te≥38℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate is X<75%, the corresponding parameter adjustment value is 0; if the real-time uptime rate is 75%≤X<85%, the corresponding parameter adjustment value is a; if the real-time uptime rate is 85%≤X<90%, the corresponding parameter adjustment value is 2a; if the real-time uptime rate is X≥90%, the corresponding parameter adjustment value is b. When the ambient temperature is within the range of 32℃≤te<38℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate is X<70%, the corresponding parameter adjustment value is 0; if the real-time uptime rate is 70%≤X<80%, the corresponding parameter adjustment value is a; if the real-time uptime rate is 80%≤X<90%, the corresponding parameter adjustment value is 2a; if the real-time uptime rate is X≥90%, the corresponding parameter adjustment value is b. When the ambient temperature is within the range of 26℃≤te<32℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate is X<60%, the corresponding parameter adjustment value is 0; if the real-time uptime rate is 60%≤X<70%, the corresponding parameter adjustment value is a; if the real-time uptime rate is 70%≤X<80%, the corresponding parameter adjustment value is 2a; if the real-time uptime rate is 80%≤X<90%, the corresponding parameter adjustment value is 3a; if the real-time uptime rate is X≥90%, the corresponding parameter adjustment value is b. When the ambient temperature is within the range of 20℃≤te<26℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate is X<50%, the corresponding parameter adjustment value is 0; if the real-time uptime rate is 50%≤X<60%, the corresponding parameter adjustment value is a; if the real-time uptime rate is 60%≤X<70%, the corresponding parameter adjustment value is 2a; if the real-time uptime rate is 70%≤X<80%, the corresponding parameter adjustment value is 3a; if the real-time uptime rate is 80%≤X<90%, the corresponding parameter adjustment value is 4a; if the real-time uptime rate is X≥90%, the corresponding parameter adjustment value is b. When the ambient temperature is within the range of 14℃≤te<20℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate is X<40%, the corresponding parameter adjustment value is 0; if the real-time uptime rate is 40%≤X<50%, the corresponding parameter adjustment value is a; if the real-time uptime rate is 50%≤X<60%, the corresponding parameter adjustment value is 2a; if the real-time uptime rate is 60%≤X<70%, the corresponding parameter adjustment value is 3a; if the real-time uptime rate is 70%≤X<80%, the corresponding parameter adjustment value is 4a; if the real-time uptime rate is 80%≤X<90%, the corresponding parameter adjustment value is 5a; if the real-time uptime rate is X≥90%, the corresponding parameter adjustment value is b. When the ambient temperature is within the range of te < 14℃, the corresponding operating parameter adjustment strategy is as follows: if the real-time uptime rate is X < 30%, the corresponding parameter adjustment value is 0; if the real-time uptime rate is 30% ≤ X < 40%, the corresponding parameter adjustment value is a; if the real-time uptime rate is 40% ≤ X < 50%, the corresponding parameter adjustment value is 2a; if the real-time uptime rate is 50% ≤ X < 60%, the corresponding parameter adjustment value is 3a; if the real-time uptime rate is 60% ≤ X < 70%, the corresponding parameter adjustment value is 4a; if the real-time uptime rate is 70% ≤ X < 80%, the corresponding parameter adjustment value is 5a; if the real-time uptime rate is 80% ≤ X < 90%, the corresponding parameter adjustment value is 6a; if the real-time uptime rate is X ≥ 90%, the corresponding parameter adjustment value is b. Where te is the ambient temperature, X is the real-time uptime rate; a is the preset operating parameter value, and b = a max -a0; a max is the preset maximum operating parameter, and a0 is the operating parameter at startup.

8. The refrigerator as described in claim 1, characterized in that, The operating rate for the previous start / stop cycle is calculated using the following formula: The real-time uptime rate for the current start-up / shutdown cycle is calculated using the following formula: Where X′ is the operating rate of the previous start / stop cycle, X is the real-time operating rate of the current start / stop cycle, and T′ on The power-on duration of the previous start-stop cycle, T′ off T represents the downtime of the previous start-stop cycle. on This represents the running time during the current start / stop cycle.

9. The refrigerator as described in claim 1, characterized in that, The refrigerator also includes: A start / stop controller is located in the refrigerator body and connected to the controller. It is used to send a start signal of the inverter compressor to the controller when a preset start-up condition is met, and to send a stop signal of the inverter compressor to the controller when a preset stop condition is met. The controller is further configured to: control the variable frequency compressor to start operation according to the variable frequency compressor start-up signal; and control the variable frequency compressor to stop operation according to the variable frequency compressor stop-down signal.

10. A control method for a variable frequency compressor of a refrigerator, characterized in that, The refrigerator includes an inverter compressor and an ambient temperature sensor for detecting the current ambient temperature. The method includes: After the variable frequency compressor is powered on, preset operating parameters are acquired as the operating parameters of the variable frequency compressor in the first start-stop cycle; In non-first start-stop cycles, the start-stop threshold condition corresponding to the current ambient temperature is determined based on the preset correspondence between ambient temperature and start-up rate threshold condition. The operating parameters of the variable frequency compressor at startup are determined based on the relationship between the start-up rate of the previous start-stop cycle and the start-up rate threshold condition. Based on the preset correspondence between ambient temperature and operating parameter adjustment strategies, the operating parameter adjustment strategy corresponding to the current ambient temperature is determined. Based on the relationship between the real-time start-up rate of the current start-up / shutdown cycle and the operating parameter adjustment strategy, the corresponding parameter adjustment value is determined, and the current operating parameters are adjusted according to the parameter adjustment value. The operating parameter adjustment strategy includes the correspondence between the real-time start-up rate and the parameter adjustment value.

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