Refrigerator

Abstract

The invention discloses a refrigerator which comprises a refrigerant loop, a pulsating pressure sensor, a sound pressure sensor and a controller, and the pulsating pressure sensor is used for collecting pulsating pressure data when a compressor exhausts; the sound pressure sensor is used for collecting sound pressure data of the compressor; the controller is connected with the pulsating pressure sensor and the sound pressure sensor, and the controller is configured to determine that the compressor meets the pulsating pressure overrun condition according to the pulsating pressure data and the sound pressure data; sequentially judging refrigeration judgment conditions, energy consumption judgment conditions and noise judgment conditions of the compressor; and when the compressor does not meet any one of the refrigeration judgment condition, the energy consumption judgment condition and the noise judgment condition, the rotating speed of the compressor is adjusted so that the compressor can meet the refrigeration judgment condition, the energy consumption judgment condition and the noise judgment condition. According to the refrigerator, the problem that noise is increased due to the fact that exhaust pulsating pressure is increased due to long-time operation of the compressor can be solved, and meanwhile refrigeration and energy efficiency optimization is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and particularly to a refrigerator. Background Art

[0002] The compressor of a refrigerator is the core component of the refrigerator refrigeration system, responsible for converting the refrigerant from a low-temperature and low-pressure gas into a high-temperature and high-pressure gas and then discharging it, so that the refrigerant circulates in the refrigerant circuit. During the operation of the compressor, certain exhaust pulsation pressure will be generated, and these exhaust pulsation pressures gradually increase with the long-term operation of the compressor, resulting in an increase in pipeline vibration, thereby causing an increase and fluctuation in the specific frequency range of the overall machine noise. Moreover, the increase in the exhaust pulsation pressure may also cause abnormalities in the refrigeration performance, power consumption, etc. of the product, reducing the overall performance of the refrigerator, thus affecting the stability, reliability of the refrigerator and the user experience. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, an object of the present invention is to provide a refrigerator that can reduce the problem of increased noise caused by the increase in exhaust pulsation pressure caused by the long-term operation of the compressor, and at the same time realizes the optimization of refrigeration and energy efficiency, thereby improving the operating stability and reliability of the refrigerator and enhancing the user experience.

[0004] To achieve the above object, the refrigerator according to an embodiment of the present invention includes: a refrigerant circuit that circulates the refrigerant in a compressor, an evaporator, a throttling device, and a condenser, and the compressor is used to convert the refrigerant from a low-temperature and low-pressure gas into a high-temperature and high-pressure gas and then discharge it into the refrigerant circuit; a pulsation pressure sensor disposed in the exhaust pipe of the compressor or in a tee pipe connected to the compressor exhaust port for collecting pulsation pressure data when the compressor exhausts; a sound pressure sensor disposed in the machine compartment of the compressor for collecting sound pressure data of the compressor; a controller, the controller is connected to the pulsation pressure sensor and the sound pressure sensor, and the controller is configured to: determine that the compressor satisfies the pulsation pressure overlimit condition according to the pulsation pressure data and the sound pressure data; sequentially judge the refrigeration determination condition, the energy consumption determination condition, and the noise determination condition for the compressor; when the compressor does not satisfy any one of the refrigeration determination condition, the energy consumption determination condition, and the noise determination condition, adjust the rotation speed of the compressor so that the compressor satisfies the refrigeration determination condition, the energy consumption determination condition, and the noise determination condition.

[0005] According to the refrigerator of the embodiment of the present invention, by providing a pulsating pressure sensor and a sound pressure sensor, the pulsating pressure data and the sound pressure data during the exhaust of the compressor can be collected in real time, and these data provide accurate information on the operating state of the compressor for the controller. According to the collected pulsating pressure data and sound pressure data, the controller uses a spectrum analysis method to determine whether the compressor meets the pulsating pressure overlimit condition. If the pulsating pressure overlimit condition is not met, there is no need to adjust the rotational speed of the compressor. If the pulsating pressure overlimit condition is met, the controller then successively judges the refrigeration determination condition, the energy consumption determination condition, and the noise determination condition for the compressor. When it is detected that the compressor does not meet any one of the refrigeration determination condition, the energy consumption determination condition, and the noise determination condition, the controller can automatically adjust the rotational speed of the compressor, thereby optimizing the operating state of the compressor to make it meet the qualified standards for refrigeration, energy consumption, noise, etc. This intelligent adjustment mechanism effectively reduces the problem of increased noise caused by the increase in exhaust pulsating pressure during the long-term operation of the compressor, and at the same time realizes the optimization of refrigeration and energy efficiency, thereby improving the operating stability and reliability of the refrigerator and enhancing the user experience.

[0006] In some embodiments, the controller is further configured to: obtain the refrigeration time in the stable operation mode during the detection operation cycle and the refrigeration time in the defrost mode during the detection operation cycle; the refrigeration determination condition includes that the refrigeration time in the stable operation mode during the detection operation cycle is within the stable refrigeration time threshold range and the refrigeration time in the defrost mode during the detection operation cycle is within the defrost refrigeration time threshold range.

[0007] The above technical solution has the following advantages or beneficial effects: By respectively obtaining the refrigeration time in the stable operation mode and the defrost mode during the detection operation cycle and comparing it with the corresponding time threshold range, the refrigeration performance of the compressor can be accurately judged. Ensure that the refrigerator can maintain a stable refrigeration effect in different operation modes, and prevent the phenomena of insufficient refrigeration or excessive refrigeration.

[0008] In some embodiments, the controller is further configured to: determine the number of times the refrigerator operates in the stable operation mode and the number of times the refrigerator operates in the defrost mode during the detection operation cycle; obtain the stable operation power consumption during the detection operation cycle according to the number of times of the stable operation mode and the power consumption per single operation of the stable operation mode, and obtain the defrost operation power consumption during the detection operation cycle according to the number of times of the defrost mode and the power consumption per single operation of the defrost mode; obtain the power consumption during the detection operation cycle according to the stable operation power consumption and the defrost operation power consumption; the energy consumption determination condition includes that the power consumption of the refrigerator during the detection operation cycle is within the power consumption threshold range.

[0009] The above technical solution has the following advantages or beneficial effects: By calculating the power consumption in the stable operation mode and the defrosting mode respectively, and summarizing the total power consumption during the detection operation cycle based on these data, the overall energy consumption performance of the refrigerator can be evaluated more accurately.

[0010] In some embodiments, the controller is further configured to detect the one-third octave value of the pulsating pressure data during the detection operation cycle; the noise determination condition includes that the noise value corresponding to the one-third octave value of the pulsating pressure during the detection operation cycle is within the noise value threshold range corresponding to the pulsating pressure.

[0011] The above technical solution has the following advantages or beneficial effects: By comparing the noise value corresponding to the one-third octave value of the pulsating pressure with the noise value threshold range corresponding to the pulsating pressure, the noise performance of the refrigerator can be evaluated more accurately.

[0012] In some embodiments, the controller is further configured to: when the duration from the current moment to the last defrosting moment is greater than or equal to a preset duration, the detection operation cycle includes the duration of running the stable operation mode once and the duration of running the defrosting mode once; or, when the duration from the current moment to the last defrosting moment is less than the preset duration, the detection operation cycle includes the duration of running the stable operation mode twice and the duration of running the defrosting mode once.

[0013] In some embodiments, the controller is further configured to: after the pulsating pressure data exceeds the pulsating pressure threshold, obtain the fundamental frequency value of the compressor according to the sound pressure data, and obtain the multiple frequency values of the fundamental frequency value; when the multiple frequency values meet the resonance condition, determine that the compressor does not meet the pulsating pressure overrun condition; or, when the multiple frequency values do not meet the resonance condition, determine that the compressor meets the pulsating pressure overrun condition; where the resonance condition is that there are a preset number of the multiple frequency values greater than n times the average sound pressure value, and the average sound pressure value is the average value of (the multiple frequency values ± 2 Hz).

[0014] The above technical solution has the following advantages or beneficial effects: By combining the analysis of the pulsating pressure data and the sound pressure data, and using the resonance condition of the fundamental frequency value and the multiple frequency values to judge whether the compressor meets the pulsating pressure overrun condition, it is possible to better identify non-resonant noise and abnormal pulsating noise, thereby reducing the possibility of false alarms.

[0015] In some embodiments, when the controller adjusts the rotational speed of the compressor, it is configured to: based on the initial rotational speed of the current mode of the detection operation cycle, gradually increase the rotational speed of the compressor from small to large at a preset frequency step within the range of (the initial rotational speed ± 3 Hz).

[0016] The above technical solution has the following advantages or beneficial effects: By means of a smooth speed increase method, the drastic change of the compressor speed is avoided, thereby ensuring the stability of the refrigerator operation, so that the compressor meets the refrigeration determination conditions, energy consumption determination conditions and noise determination conditions in different modes.

[0017] In some embodiments, the controller is further configured to: when, during the detected operation cycle, in the stable operation mode and / or defrost mode, adjusting the speed of the compressor based on the initial speed cannot meet any one of the refrigeration determination condition, the energy consumption determination condition and the noise determination condition, for the stable operation mode and / or defrost mode that do not meet the refrigeration determination condition, the energy consumption determination condition and the noise determination condition, taking the compressor speed of other operation modes except the stable operation mode and the defrost mode as the new initial speed, and gradually increasing the speed of the compressor from small to large at a preset frequency step within (the new initial speed ± 3 Hz); for the stable operation mode and / or defrost mode that meet the refrigeration determination condition, the energy consumption determination condition and the noise determination condition, controlling the compressor to operate at the adjusted speed.

[0018] The above technical solution has the following advantages or beneficial effects: By dynamically switching the operating mode speed as the new initial speed, when the determination condition cannot be met in the current mode, the controller can flexibly select the speed in other modes to continue the adjustment, which can provide a larger adjustment space for the system, thereby improving the adaptability and adjustment flexibility of the system.

[0019] In some embodiments, the controller is further configured to: after gradually increasing the speed of the compressor from small to large at a preset frequency step within (the new initial speed ± 3 Hz), if the compressor still cannot meet the refrigeration determination condition, the energy consumption determination condition and the noise determination condition, adjust the speed of the compressor according to the current mode of the detected operation cycle and the determination results of the compressor for the refrigeration determination condition, the energy consumption determination condition and the noise determination condition.

[0020] The above technical solution has the following advantages or beneficial effects: By analyzing whether the current mode of the detected operation cycle is the stable operation mode or the defrost mode, and adaptively adjusting the speed of the compressor based on the determination results of the refrigeration determination condition, the energy consumption determination condition and the noise determination condition in different modes, so that on the basis of meeting some determination conditions, the influence of the unmet determination conditions is minimized, thereby achieving the balance among refrigeration, energy consumption and noise.

[0021] In some embodiments, the controller is further configured to: in the stable operation mode of the detection operation cycle, when the compressor does not meet the refrigeration determination condition or the energy consumption determination condition, control the compressor to maintain the initial rotation speed of the current mode of the detection operation cycle; or, when the compressor meets the refrigeration determination condition and the energy consumption determination condition, and the compressor does not meet the noise determination condition, control the compressor at the rotation speed corresponding to the lowest noise value within the range of (the nominal noise value of the refrigerator + m dB), where m ≥ 1; when the sound pressure data of the compressor exceeds (the nominal noise value of the refrigerator + m dB), control the compressor at the rotation speed corresponding to the minimum noise value within the range where the compressor meets the refrigeration determination condition and the energy consumption determination condition.

[0022] The above technical solution has the following advantages or beneficial effects: in the stable operation mode of the detection operation cycle, by adjusting the rotation speed of the compressor according to the nominal noise value of the refrigerator and the noise determination condition, it can ensure that the compressor reduces the noise level as much as possible while meeting the refrigeration and energy efficiency conditions. Especially when the noise exceeds the preset range, the system will automatically adjust to the rotation speed corresponding to the lowest noise value, thereby reducing the interference of noise and improving the user's comfort on the premise of ensuring the operation efficiency. In some embodiments, the controller is further configured to: in the defrosting mode of the detection operation cycle, control the compressor at the rotation speed corresponding to the minimum noise when the compressor meets the refrigeration determination condition and the energy consumption determination condition, and increase the defrosting determination time by a preset duration, and operate the defrosting mode during a preset daytime period.

[0023] The above technical solution has the following advantages or beneficial effects: in the defrosting mode of the detection operation cycle, by controlling the compressor at the rotation speed corresponding to the minimum noise when the compressor meets the refrigeration determination condition and the energy consumption determination condition, the running noise of the refrigerator can be further reduced, thereby enhancing the user experience.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a block diagram of a refrigerator according to an embodiment of the present invention; Figure 2 is a block diagram of a controller according to an embodiment of the present invention; Figure 3It is a flowchart of a control method for a refrigerator according to an embodiment of the present invention.

[0026] Reference numerals: Refrigerator 100; Refrigerant circuit 1; pulsating pressure sensor 2; sound pressure sensor 3; controller 4; Compressor 11; evaporator 12; throttling device 13; condenser 14; processor 41; memory 42. Detailed implementation manners

[0027] Embodiments of the present invention will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention will be described in detail below.

[0028] Reference will be made below to Figure 1 Describe a refrigerator according to an embodiment of the present invention.

[0029] Figure 1 It is a block diagram of a refrigerator according to an embodiment of the present invention. As Figure 1 shown, the refrigerator includes: a refrigerant circuit 1, a pulsating pressure sensor 2, a sound pressure sensor 3, and a controller 4.

[0030] In some embodiments, the refrigerant circuit 1 may be a closed pipeline system formed by connecting multiple components (such as a compressor 11, an evaporator 12, a throttling device 13, and a condenser 14, etc.). The refrigerant circuit 1 can enable the refrigerant to circulate in the compressor 11, the evaporator 12, the throttling device 13, and the condenser 14, thereby completing heat transfer and temperature control.

[0031] Specifically, the compressor 11 can suck in low-pressure and low-temperature gaseous refrigerant, and then compress it into high-pressure and high-temperature gaseous refrigerant through a compression action. Then, the high-pressure and high-temperature gaseous refrigerant is discharged by the compressor 11 and enters the condenser 14. Heat exchange is carried out with the external environment in the condenser 14 to dissipate heat and condense into high-pressure and low-temperature liquid refrigerant.

[0032] Further, the liquid refrigerant in the condenser 14 flows through the throttling device 13. During the throttling process, due to the throttling effect, the pressure of the refrigerant rapidly decreases, and then it turns into low-temperature and low-pressure liquid refrigerant. Then, the refrigerant enters the evaporator 12, absorbs the heat inside the refrigerator in the evaporator 12. As the refrigerant absorbs heat, it gradually evaporates and finally completely turns into low-temperature and low-pressure gaseous refrigerant. The low-temperature and low-pressure gaseous refrigerant will enter the compressor 11 again through the return pipe to start the next cycle. Through this complete cycle process, the refrigerant circuit 1 realizes the continuous transfer of heat inside the refrigerator and the maintenance of temperature, thereby ensuring that the refrigerator has efficient and stable refrigeration performance.

[0033] In some embodiments, the compressor 11 is one of the core components of the refrigerator, which is used to convert the refrigerant from a low-temperature and low-pressure gas into a high-pressure and high-temperature gas and then discharge it into the refrigerant circuit 1 to provide power for the refrigeration cycle. The compressor 11 can be different types of compressors 11, such as a piston compressor, a scroll compressor, a centrifugal compressor, or a screw compressor. The specific type of the compressor 11 can be selected according to the specific design requirements of the refrigerator, and no specific limitation is made here.

[0034] In some embodiments, the condenser 14 can be a heat exchange device in the refrigerator, and its main function is to cool the high-temperature and high-pressure gaseous refrigerant discharged by the compressor 11 and condense it into a liquid refrigerant, thereby releasing heat. The condenser 14 can be different types of condensers 14, such as a finned condenser, a plate condenser, or a shell-and-tube condenser. The specific type of the condenser 14 can be selected according to the specific design requirements of the refrigerator, and no specific limitation is made here.

[0035] In some embodiments, the evaporator 12 is another heat exchange device in the refrigerator, and its main function is to make the low-temperature and low-pressure liquid refrigerant absorb heat and evaporate, further absorbing the heat in the refrigerator, thereby achieving the refrigeration effect. The evaporator 12 can be different types of evaporators 12, such as a finned evaporator, a plate evaporator, or a shell-and-tube evaporator. The specific type of the evaporator 12 can be selected according to the specific design requirements of the refrigerator, and no specific limitation is made here.

[0036] In some embodiments, the throttling device 13 can be a device for controlling the refrigerant flow rate, and the refrigerant pressure is adjusted by changing the cross-sectional area of the fluid passage. The throttling device 13 can adopt various forms, including but not limited to an electric expansion valve, a thermal expansion valve, a manual expansion valve, etc. The specific type of the throttling device 13 can be selected according to the specific design requirements of the refrigerator, and no specific limitation is made here.

[0037] In some embodiments, the pulsating pressure sensor 2 is arranged in the exhaust pipe of the compressor 11 or in the tee pipe connected to the compressor exhaust port, and is used to collect the pulsating pressure data when the compressor 11 exhausts.

[0038] In some embodiments, the sound pressure sensor 3 is arranged in the engine compartment of the compressor 11 and is used to collect the sound pressure data of the compressor 11. Through the collected sound pressure data, the vibration, resonance with other components, and noise characteristics of the compressor 11 during operation can be analyzed spectroscopically, thereby providing a basis for subsequent judgment.

[0039] In some embodiments, the sound pressure sensor 3 faces the position of the evaporating dish, and there should be no obstruction in the middle, so as to ensure that there is no obstacle between the sound pressure sensor 3 and the noise source, and to prevent measurement errors, such as signal attenuation or reflection effects, thereby improving the measurement accuracy.

[0040] In some embodiments, the controller 4 is connected to the pulsating pressure sensor 2 and the sound pressure sensor 3. The controller 4 is configured to: determine that the compressor 11 meets the pulsating pressure overlimit condition according to the pulsating pressure data and the sound pressure data. Sequentially judge the refrigeration determination condition, the energy consumption determination condition, and the noise determination condition for the compressor 11. When the compressor 11 does not meet any one of the refrigeration determination condition, the energy consumption determination condition, and the noise determination condition, adjust the rotation speed of the compressor 11 so that the compressor 11 sequentially meets the refrigeration determination condition, the energy consumption determination condition, and the noise determination condition.

[0041] Among them, the pulsating pressure overlimit condition can be an important judgment basis for the abnormal operation state of the compressor, playing a warning role. When it is determined that the compressor 11 meets the pulsating pressure overlimit condition, it indicates that the working state of the compressor 11 may have begun to affect the refrigeration effect, energy consumption, or noise performance, thus triggering the subsequent judgment and adjustment process. Therefore, as a signal to start further judgment, the pulsating pressure overlimit condition can allow the controller 4 to intervene in the first time, sequentially check the refrigeration, energy consumption, and noise conditions, and ensure that the problem is not further deteriorated by adjusting the rotation speed.

[0042] In some embodiments, after determining that the compressor 11 meets the pulsating pressure overlimit condition, the controller 4 adopts a sequential judgment strategy, that is, first judge the refrigeration condition, then judge the energy consumption condition, and finally judge the noise condition. This order design is based on the following considerations: Refrigeration is the core function of the refrigerator, and its effect is directly related to food preservation and user experience. Therefore, the refrigeration determination condition is placed first to ensure the accuracy and stability of temperature control. On the basis of passing the refrigeration determination, further evaluate the energy consumption performance of the system to ensure that the refrigerator has high energy efficiency and low power consumption while maintaining the refrigeration performance. After both the refrigeration determination and the energy consumption determination are qualified, then evaluate whether the noise level is within a reasonable range to ensure that users obtain a comfortable experience.

[0043] Therefore, the controller 4 adjusts the rotation speed of the compressor 11 step by step, so that the compressor 11 sequentially meets the refrigeration determination condition, the energy consumption determination condition, and the noise determination condition. This multi-level adjustment mechanism not only effectively prevents the problem that the exhaust pulsating pressure increases due to long-term operation, which in turn leads to an increase in noise, but also realizes the precise optimization of refrigeration performance and energy efficiency, further improving the stability, reliability, and user experience of the refrigerator operation.

[0044] In some embodiments, such as Figure 2As shown, the controller 4 may include a processor 41 and a memory 42. Among them, the processor 41 may be a central processing unit (CPU), a microcontroller unit (MCU), a digital signal processor (DSP), a graphics processing unit (GPU), a field-programmable gate array (FPGA), or an application-specific integrated circuit (ASIC), etc., and is used to execute core control tasks such as compressor speed regulation, data analysis, and condition determination.

[0045] In some embodiments, the memory 42 may be a random access memory (RAM), a read-only memory (ROM), a flash memory, or a non-volatile random access memory (NVRAM), and is used to store control logic programs, pulsating pressure data, sound pressure data, and preset parameters of determination conditions.

[0046] According to the refrigerator of the embodiment of the present invention, by providing a pulsating pressure sensor 2 and a sound pressure sensor 3, the pulsating pressure data and the sound pressure data during the exhaust of the compressor 11 can be collected in real time, and these data provide accurate information on the operating state of the compressor for the controller 4. The controller 4 uses a spectrum analysis method to determine whether the compressor 11 meets the pulsating pressure overlimit condition according to the collected pulsating pressure data and sound pressure data. If the pulsating pressure overlimit condition is not met, there is no need to adjust the speed of the compressor 11. If the pulsating pressure overlimit condition is met, the refrigeration determination condition, the energy consumption determination condition, and the noise determination condition of the compressor 11 are sequentially judged. When it is detected that the compressor 11 does not meet any one of the refrigeration determination condition, the energy consumption determination condition, and the noise determination condition, the controller 4 can automatically adjust the speed of the compressor 11, thereby optimizing the operating state of the compressor 11 to make it meet the qualified standards of refrigeration, energy consumption, and noise. This intelligent adjustment mechanism effectively reduces the problem of increased noise caused by the increase in exhaust pulsating pressure caused by the long-term operation of the compressor 11, and at the same time realizes the optimization of refrigeration and energy efficiency, thereby improving the operating stability and reliability of the refrigerator and enhancing the user experience.

[0047] In some embodiments, the controller 4 is further configured to: obtain the refrigeration time in the stable operation mode during the detection operation cycle and the refrigeration time in the defrost mode during the detection operation cycle.

[0048] Among them, the stable operation mode can refer to the operation cycle of the refrigerator in the normal refrigeration working state. In this mode, the compressor 11 starts and stops periodically at the set speed to maintain the refrigerating chamber and the freezing chamber within the set temperature range. The refrigeration time in the stable operation mode can refer to the total time during which the compressor 11 actually performs refrigeration work within the stable operation cycle. The defrost mode can refer to the operation cycle in which the refrigerator periodically performs defrosting operations to prevent the evaporator 12 from frosting. The defrost refrigeration time can refer to the total time during which the compressor 11 performs refrigeration work during the defrost operation cycle. Since there is a heating process in the defrost mode, the refrigeration time in the defrost mode is shorter than that in the stable operation mode.

[0049] In some embodiments, the refrigeration determination conditions include detecting that the refrigeration time in the stable operation mode within the operation cycle is within the stable refrigeration time threshold range and detecting that the refrigeration time in the defrost mode within the operation cycle is within the defrost refrigeration time threshold range. Among them, the stable refrigeration time threshold range and the defrost refrigeration time threshold range can be set according to factors such as the design of the refrigerator, the ambient temperature, and the refrigeration set temperature, and no specific limitation is made here.

[0050] Specifically, during the determination process, the controller 4 first evaluates whether the refrigeration time in the stable operation mode meets the stable refrigeration time threshold range, and then evaluates whether the refrigeration time in the defrost mode meets the defrost refrigeration time threshold range. Only when both of these conditions are met does the controller 4 consider that the compressor 11 meets the refrigeration determination conditions, that is, the refrigeration of the compressor 11 in the stable operation mode and the defrost mode is qualified. If any one of them does not meet the requirements, for example, the refrigeration time in the stable operation mode is not within the stable refrigeration time threshold range, then the controller 4 considers that the refrigeration of the compressor 11 in the stable operation mode is unqualified, and the controller 4 will adjust the speed of the compressor 11 in the stable operation mode according to the evaluation result. Or, if the refrigeration time in the defrost mode is not within the defrost refrigeration time threshold range, then the controller 4 considers that the refrigeration of the compressor 11 in the defrost mode is unqualified, and the controller 4 will adjust the speed of the compressor 11 in the defrost mode according to the evaluation result.

[0051] Therefore, by respectively obtaining the refrigeration time in the stable operation mode and the defrost mode within the detection operation cycle and comparing it with the corresponding time threshold range, the refrigeration performance of the compressor 11 can be accurately judged. Ensure that the refrigerator can maintain a stable refrigeration effect in different operation modes and prevent the phenomena of insufficient refrigeration or excessive refrigeration.

[0052] In some embodiments, the controller 4 is further configured to: determine the number of times the refrigerator operates in the stable operation mode and the number of times the refrigerator operates in the defrosting mode during the detection operation cycle. Obtain the stable operation power consumption during the detection operation cycle according to the number of times of the stable operation mode and the power consumption of a single operation in the stable operation mode, and obtain the defrosting operation power consumption during the detection operation cycle according to the number of times of the defrosting mode and the power consumption of a single operation in the defrosting mode. Obtain the power consumption during the detection operation cycle according to the stable operation power consumption and the defrosting operation power consumption. That is, the power consumption during the detection operation cycle = the power consumption of the stable operation mode + the power consumption of the defrosting mode.

[0053] In some embodiments, the energy consumption determination condition includes that the power consumption of the refrigerator during the detection operation cycle is within the power consumption threshold range. Specifically, the controller 4 can determine whether the obtained power consumption during the detection operation cycle is within the preset power consumption threshold range. If the power consumption exceeds this threshold range, it indicates that the energy efficiency performance of the refrigerator in this cycle is unqualified, and the controller 4 needs to adjust the rotation speed of the compressor 11. At this time, the controller 4 will optimize the energy efficiency by adjusting the rotation speed on the premise of ensuring qualified refrigeration, reduce the energy consumption, and at the same time ensure good refrigeration effect.

[0054] In some embodiments, the power consumption threshold range can be set according to factors such as the rated power of the refrigerator, the ambient temperature, and the design requirements, and no specific limitation is made here.

[0055] In some embodiments, the controller 4 is further configured to detect the one-third octave value of the pulsating pressure data during the detection operation cycle, where the one-third octave is a method in spectrum analysis for dividing the spectrum into different frequency bands, and the width of each frequency band is one-third of the center frequency of the frequency band. The one-third octave value of the pulsating pressure refers to the pulsating pressure value extracted within a specific frequency band (such as 500 Hz, 630 Hz, 800 Hz, etc.) after performing spectrum analysis on the pulsating pressure signal.

[0056] In some embodiments, the noise determination condition includes that the noise value corresponding to the one-third octave value of the pulsating pressure during the detection operation cycle is within the noise value threshold range corresponding to the pulsating pressure. Specifically, the controller 4 compares the noise value corresponding to the one-third octave value of the pulsating pressure with the preset noise value threshold range. If the noise value is within this range, it means that the noise is within an acceptable range; if it exceeds this range, it means that the noise exceeds the standard, and the controller 4 can optimize the noise by adjusting the rotation speed of the compressor 11.

[0057] In some embodiments, the noise value threshold range can be set according to factors such as the design of the refrigerator, the installation environment, and the user experience requirements, and no specific limitation is made here.

[0058] In some embodiments, before performing the refrigeration determination condition, the energy consumption determination condition, and the noise determination condition on the compressor 11, the controller 4 is further configured to: determine the number of times the refrigerator operates in the stable operation mode and the number of times the refrigerator operates in the defrost mode during the detection operation period. When the duration from the current moment to the last defrost moment is greater than or equal to the preset duration, the detection operation period includes the duration of one stable operation mode and the duration of one defrost mode. Alternatively, when the duration from the current moment to the last defrost moment is less than the preset duration, the detection operation period includes the duration of two stable operation modes and the duration of one defrost mode.

[0059] Specifically, the number of times the refrigerator operates in the stable operation mode and the number of times the refrigerator operates in the defrost mode can be determined according to the time difference between the end time of the last defrost mode and the time of the current detection operation period. If the time interval between the end time of the last defrost mode and the current detection operation period is greater than or equal to the preset duration threshold (e.g., 8 hours), it indicates that the refrigerator has not been defrosted for a long time and there may be a certain amount of frost accumulated inside. To avoid affecting the refrigeration effect of the refrigerator, the controller 4 can operate one stable operation mode and one defrost mode within one detection operation period. If the time interval between the end time of the last defrost mode and the current detection period is less than the preset duration threshold (e.g., 8 hours), it indicates that the amount of frost inside the refrigerator is small and has little impact on the refrigeration effect. The controller 4 then believes that more stable operation modes can be performed. That is, two stable operation modes and one defrost mode can be operated within one detection operation period.

[0060] It should be noted that if any one of the refrigeration determination condition, the energy consumption determination condition, or the noise determination condition is unqualified during the subsequent determination process, and when entering the detection operation period again after adjusting the rotation speed, the controller 4 will uniformly set to: operate two stable operation modes and one defrost mode within one detection operation period, and this setting will continue to be executed until the detection operation period is exited.

[0061] In some embodiments, the controller 4 is further configured to: after the pulsating pressure data exceeds the pulsating pressure threshold, obtain the fundamental frequency value of the compressor 11 according to the sound pressure data, and further obtain the harmonic frequency values of the fundamental frequency value. When the harmonic frequency values meet the resonance condition, it is determined that the compressor 11 does not meet the pulsating pressure overrun condition. Alternatively, when the harmonic frequency values do not meet the resonance condition, it is determined that the compressor 11 meets the pulsating pressure overrun condition. Wherein, the resonance condition is that there are a preset number of harmonic frequency values greater than n times the average sound pressure value, and the average sound pressure value is the average value of all sound pressure values within the range of (harmonic frequency value ± 2 Hz) except at the harmonic frequency value.

[0062] In some embodiments, the fundamental frequency value may refer to the basic frequency component during the operation of the compressor 111, corresponding to the rotational speed frequency of the compressor 11. The multiple frequency value may refer to an integer multiple frequency of the fundamental frequency value. For example, if the fundamental frequency value is 50 Hz, its multiple frequency values are 100 Hz, 150 Hz, 200 Hz, etc. These multiple frequency values represent the higher harmonics of the fundamental frequency signal, and they can help identify the vibration modes of the device and the sources of abnormal noises in spectral analysis.

[0063] In some embodiments, resonance may refer to the occurrence of coincidence or proximity between a certain multiple frequency value and the natural frequency of the system (such as the resonant frequency of the refrigerator structure), which may generate a strong resonance effect. In this case, even if the pulsating pressure does not exceed the limit, the system may still exhibit abnormal vibration or noise.

[0064] Specifically, after the pulsating pressure sensor 2 collects the pulsating pressure data during the exhaust of the compressor 11, the one-third octave value of the pulsating pressure can be extracted, such as the pulsating pressure data of 500 Hz, 630 Hz, and 800 Hz. At a specific moment (such as moment T), when the pulsating pressure data of 500 Hz, 630 Hz, and 800 Hz exceed the pulsating pressure threshold, the sound pressure sensor 3 starts to operate to collect the sound pressure data of the compressor 11.

[0065] Furthermore, the controller 4 can analyze the collected sound pressure data to further determine whether the fundamental frequency value and its multiple frequency values meet the resonance conditions. The specific steps are as follows: First, determine the rotational speed of the compressor 11, and screen the fundamental frequency value (for example, if the rotational speed is 3000 revolutions, then the frequency at which the maximum value within 50 Hz ± 2 Hz is the fundamental frequency value). By analyzing the multiple frequency values of the fundamental frequency value (such as the second harmonic value, the third harmonic value, etc.), determine whether the multiple frequency value meets the resonance conditions. The resonance condition is that there are a preset number (such as N) of sound pressure values at the multiple frequency values greater than n times the average sound pressure value within the range of the multiple frequency value ± 2 Hz except at the multiple frequency values. If the multiple frequency value meets the resonance conditions, it indicates that the noise is mainly caused by the resonance effect rather than the pulsating pressure exceeding the limit. Therefore, the controller 4 determines that the compressor 11 does not meet the pulsating pressure exceeding the limit condition. If the multiple frequency value does not meet the resonance conditions, it indicates that the noise is more caused by the excessive pulsating pressure. Therefore, the controller 4 determines that the compressor 11 meets the pulsating pressure exceeding the limit condition.

[0066] In some embodiments, when adjusting the rotational speed of the compressor 11, the controller 4 is configured to: based on the initial rotational speed of the currently detected operation cycle mode, gradually increase the rotational speed of the compressor 11 from small to large within the range of (initial rotational speed ± 3 Hz) at a preset frequency step. By means of a smooth speed increase method, the drastic change in the rotational speed of the compressor is avoided, thereby ensuring the stability of the refrigerator operation.

[0067] Among them, the initial rotational speed may refer to the initial operating rotational speed of the compressor 11 in a certain operating mode (such as a stable operating mode or a defrosting mode) within the current detection operating cycle. This initial rotational speed can be set according to factors such as the design requirements of the refrigerator, the current working environment, and the cooling demand, and no specific limitation is made here.

[0068] In some embodiments, the preset frequency step may refer to the amplitude of increasing the rotational speed each time, which is a small and fixed increment. For example, the preset frequency step can be set to 1 Hz. Then, the controller 4 can first lower the rotational speed of the compressor 11 to the initial rotational speed - 3 Hz, and then gradually increase the rotational speed in increments of 1 Hz until the upper limit of the initial rotational speed + 3 Hz is reached. By gradually increasing the rotational speed of the compressor 11 from small to large within the range of (initial rotational speed ± 3 Hz) with the preset frequency step, the compressor 11 can meet the refrigeration determination conditions, energy consumption determination conditions, and noise determination conditions in different modes.

[0069] In some embodiments, the controller 4 is further configured to: when adjusting the rotational speed of the compressor 11 based on the initial rotational speed in the stable operating mode and / or defrosting mode within the detection operating cycle cannot meet any one of the refrigeration determination conditions, energy consumption determination conditions, and noise determination conditions, for the stable operating mode and / or defrosting mode that do not meet the refrigeration determination conditions, energy consumption determination conditions, and noise determination conditions, use the rotational speed of the compressor in other operating modes except the stable operating mode and the defrosting mode as the new initial rotational speed, and gradually increase the rotational speed of the compressor 11 from small to large within the range of (new initial rotational speed ± 3 Hz) with the preset frequency step.

[0070] Specifically, in the detection operating cycle, the compressor 11 is in a certain specific operating mode, such as a stable operating mode or a defrosting mode, and each mode has an initial rotational speed, which is preset according to the design requirements of the refrigerator, environmental conditions, and cooling demand. The controller 4 gradually increases the rotational speed of the compressor 11 from small to large within the range of (initial rotational speed ± 3 Hz) with the preset frequency step (such as 1 Hz) to make the system meet the various determination conditions of refrigeration, energy consumption, and noise.

[0071] Furthermore, if in the current detection operating cycle, the rotational speed obtained after adjusting based on the original initial rotational speed still cannot meet any one of the refrigeration determination conditions, energy consumption determination conditions, or noise determination conditions, it means that the adjustment space in the existing mode is not sufficient to optimize the refrigeration, energy consumption, and noise of the system. At this time, the controller 4 will instead use the rotational speed of the compressor in other operating modes except the stable operating mode or the defrosting mode (such as the rapid cooling mode) as the new initial rotational speed.

[0072] Further, based on the compressor speed in other operating modes, the system will sequentially re-judge the refrigeration determination condition, energy consumption determination condition, and noise determination condition for the compressor 11. If the compressor 11 still does not meet any one of the refrigeration determination condition, energy consumption determination condition, and noise determination condition, the controller 4 will increase the speed of the compressor 11 again within the range of (new initial speed ± 3 Hz) gradually from small to large at a preset frequency step, so that the compressor 11 meets the refrigeration determination condition, energy consumption determination condition, and noise determination condition under different modes.

[0073] Generally speaking, by means of dynamically switching the operating mode speed as the new initial speed, when the determination condition cannot be met in the current mode, the controller 4 can flexibly select the speed in other modes to continue the adjustment, which can provide a larger adjustment space for the system, thereby improving the adaptability and adjustment flexibility of the system.

[0074] In some embodiments, for the stable operating mode and / or defrosting mode that meet the refrigeration determination condition, energy consumption determination condition, and noise determination condition, the compressor 11 is controlled to operate at the adjusted speed, thereby realizing the optimization of refrigeration, energy efficiency, and noise.

[0075] In some embodiments, the controller 4 is further configured to: after increasing the speed of the compressor 11 gradually from small to large at a preset frequency step within the range of (new initial speed ± 3 Hz), if the compressor 11 still cannot meet the refrigeration determination condition, energy consumption determination condition, and noise determination condition, adjust the speed of the compressor 11 according to the current mode of the detected operation cycle and the determination results of the compressor 11 for the refrigeration determination condition, energy consumption determination condition, and noise determination condition.

[0076] Specifically, after increasing the speed of the compressor 11 step by step multiple times and switching the operating mode, the compressor 11 still cannot meet the refrigeration determination condition, energy consumption determination condition, and noise determination condition all the time, which means that it is impossible to make the compressor 11 meet the refrigeration determination condition, energy consumption determination condition, and noise determination condition simultaneously by adjusting the speed. At this time, the controller 4 can analyze whether the current mode of the detected operation cycle is a stable operating mode or a defrosting mode, and adaptively adjust the speed of the compressor 11 based on the determination results of the refrigeration determination condition, energy consumption determination condition, and noise determination condition under different modes, so that on the basis of meeting some determination conditions, the influence of the unmet determination conditions is minimized, thereby achieving the balance among refrigeration, energy consumption, and noise.

[0077] In some embodiments, the controller 4 is further configured to: when the compressor 11 does not meet the refrigeration determination condition or the energy consumption determination condition in the stable operation mode of the detection operation cycle, control the compressor 11 to maintain the initial rotational speed of the current mode of the detection operation cycle without adjusting the rotational speed. This is because the initial rotational speed is preset according to the overall performance requirements of the refrigerator, environmental conditions, and cooling requirements during design. This rotational speed has been verified through a large number of experiments and data and is considered to be able to provide relatively stable refrigeration effects and energy consumption performance in most cases. If the refrigeration determination condition or the energy consumption determination condition cannot be met by adjusting the rotational speed all the time, then further deviating from the initial rotational speed may cause other operation problems. Therefore, not adjusting the rotational speed is the optimal choice.

[0078] In some embodiments, the controller 4 is further configured to: when the compressor 11 meets the refrigeration determination condition and the energy consumption determination condition, and the compressor 11 does not meet the noise determination condition, control the compressor 11 at the rotational speed corresponding to the lowest energy consumption within the range of (nominal noise value of the refrigerator + m dB), where m ≥ 1. When the sound pressure data of the compressor 11 exceeds (nominal noise value of the refrigerator + m dB), control the compressor 11 at the rotational speed corresponding to the lowest noise value within the range where the compressor 11 meets the refrigeration determination condition and the energy consumption determination condition.

[0079] Among them, the nominal noise value is the standard operating noise level set during the design and manufacture of the refrigerator, which can be the noise data measured in a laboratory environment and represents the average noise of the refrigerator under normal operating conditions. The manufacturer will clearly mark the nominal noise value of the refrigerator in the product specifications, such as 36 dB, 38 dB, 40 dB, etc. And the nominal noise value + m dB can indicate that in actual operation, the noise of the refrigerator is allowed to have a certain floating range based on the nominal noise value. When the sound pressure data of the compressor 11 exceeds (nominal noise value + m dB), it means that the current noise has exceeded the reasonable range. At this time, the controller 4 can select the rotational speed with the lowest noise to control the compressor 11 on the premise of meeting the refrigeration determination condition and the energy consumption determination condition, further reducing the operating noise of the refrigerator and thus improving the user experience.

[0080] In some embodiments, the controller 4 is further configured to: in the defrost mode of the detection operation cycle, control the compressor 11 at the rotational speed corresponding to the lowest noise when the compressor 11 meets the refrigeration determination condition and the energy consumption determination condition, and increase the defrost determination time by a preset duration, and operate the defrost mode during a preset daytime period.

[0081] In some embodiments, increasing the defrost determination time by a preset duration can be understood as a delayed defrost, that is, within the defrost cycle, the defrost operation will be delayed by a certain preset duration before execution, which is to reduce the noise impact caused by defrosting. In addition, the defrost mode is started within a preset daytime period (such as from 8:00 am to 8:00 pm) to avoid performing noisy defrost operations during the period of 21:00 - 07:00, avoiding nighttime noise interference and improving the user's sleep quality.

[0082] Figure 3 is a flowchart of a control method for a refrigerator according to an embodiment of the present invention, as Figure 3 shown, the control method of the refrigerator at least includes steps S1 - S16, specifically as follows: S1, intelligent control of the refrigerator.

[0083] S2, the pulsating pressure sensor collects pulsating pressure data when the compressor discharges.

[0084] S3, extract the one - third octave value of the pulsating pressure data.

[0085] S4, determine that the pulsating pressure data of the one - third octave value exceeds the pulsating pressure threshold.

[0086] S5, the sound pressure sensor collects the sound pressure data of the compressor.

[0087] S6, determine the fundamental frequency value and the harmonic frequency value of the compressor.

[0088] S7, judge whether the fundamental frequency value and the harmonic frequency value meet the resonance condition. If not, enter step S8. If so, return to step S1.

[0089] S8, determine the number of times the refrigerator operates in the stable operation mode and the number of times the refrigerator operates in the defrost mode within the detection operation cycle.

[0090] S9, cut into the detection operation cycle.

[0091] S10, judge whether the compressor meets the refrigeration determination condition in the stable operation mode and / or the defrost mode. If so, enter step S11. If not, enter step S13 or S15.

[0092] S11, judge whether the compressor meets the energy consumption determination condition in the stable operation mode and / or the defrost mode. If so, enter step S12. If not, enter step S13 or S15.

[0093] S12, judge whether the compressor meets the noise determination condition in the stable operation mode and / or the defrost mode. If so, enter step S14. If not, enter step S13 or S15.

[0094] S13, based on the initial rotational speed for detecting the current mode of the operating cycle, gradually increase the rotational speed of the compressor from small to large at a preset frequency step within the range of (initial rotational speed ± 3 Hz).

[0095] S14, control the compressor to operate at the adjusted rotational speed.

[0096] S15, for the stable operation mode and / or defrost mode that do not meet the refrigeration determination condition, energy consumption determination condition, and noise determination condition, use the rotational speed of the compressor in other operation modes except for the stable operation mode and defrost mode as the new initial rotational speed, and gradually increase the rotational speed of the compressor from small to large at a preset frequency step within the range of (new initial rotational speed ± 3 Hz).

[0097] S16, after gradually increasing the rotational speed of the compressor from small to large at a preset frequency step within the range of (new initial rotational speed ± 3 Hz), if the compressor still does not meet the refrigeration determination condition, energy consumption determination condition, and noise determination condition, adjust the rotational speed of the compressor according to the current mode of the detected operation cycle and the determination results of the compressor for the refrigeration determination condition, energy consumption determination condition, and noise determination condition.

[0098] Generally speaking, through the cooperation of the pulsating pressure sensor 2 and the sound pressure sensor 3, the exhaust pulsating pressure data and sound pressure data of the compressor are collected and analyzed in real time. Through the extraction of the one-third octave value, and the resonance determination of the fundamental frequency value and the multiple frequency value, and based on the stable operation mode and defrost mode within the detected operation cycle, a comprehensive evaluation of the refrigeration, energy consumption, and noise determination conditions of the compressor is carried out. By adjusting the rotational speed of the compressor, the compressor is made to meet the refrigeration determination condition, energy consumption determination condition, and noise determination condition. This intelligent adjustment mechanism effectively reduces the problem of increased noise caused by the increase in exhaust pulsating pressure during long-term operation of the compressor, and at the same time realizes the optimization of refrigeration and energy efficiency, thereby improving the operation stability and reliability of the refrigerator and enhancing the user experience.

[0099] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0100] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A refrigerator, characterized in that: include: A refrigerant circuit, which allows the refrigerant to circulate in the compressor, evaporator, throttling device and condenser, wherein the compressor is used to convert the refrigerant from low-temperature and low-pressure gas to high-pressure and high-temperature gas and then discharge it into the refrigerant circuit; A pulsating pressure sensor is arranged in the exhaust pipe of the compressor or in a three-way pipe connected to the exhaust port of the compressor, and is used to collect pulsating pressure data when the compressor is exhausted; A sound pressure sensor is disposed in a compartment of the compressor and is used to collect sound pressure data of the compressor; A controller, the controller being connected to the pulsating pressure sensor and the sound pressure sensor, the controller being configured to: determine, according to the pulsating pressure data and the sound pressure data, whether the compressor satisfies a pulsating pressure over-limit condition; sequentially judging the refrigeration judgment condition, the energy consumption judgment condition and the noise judgment condition of the compressor; When the compressor does not satisfy any one of the refrigeration determination condition, the energy consumption determination condition and the noise determination condition, the speed of the compressor is adjusted so that the compressor satisfies the refrigeration determination condition, the energy consumption determination condition and the noise determination condition.

2. The refrigerator according to claim 1, characterized in that: The controller is further configured to: obtain the refrigeration time of the stable operation mode within the detection operation cycle and the refrigeration time of the defrost mode within the detection operation cycle; The refrigeration determination condition includes that the refrigeration time of the stable operation mode within the detection operation cycle is within a stable refrigeration time threshold range and the refrigeration time of the defrost mode within the detection operation cycle is within a defrost refrigeration time threshold range.

3. The refrigerator according to claim 1, characterized in that: The controller is also configured to: Determine the number of times the refrigerator operates in a stable operation mode and the number of times the refrigerator operates in a defrost mode during the detection operation cycle; The stable operation power consumption in the detection operation cycle is obtained according to the number of the stable operation mode and the power consumption of a single operation of the stable operation mode, and the defrost operation power consumption in the detection operation cycle is obtained according to the number of the defrost mode and the power consumption of a single operation of the defrost mode; Obtaining the power consumption in the detection operation cycle according to the stable operation power consumption and the defrosting operation power consumption; The energy consumption determination condition includes that the power consumption of the refrigerator during the detection operation cycle is within a power consumption threshold range.

4. The refrigerator according to claim 1, characterized in that: The controller is further configured to detect a pulsating pressure one-third octave band value of the pulsating pressure data within an operation cycle; The noise determination condition includes that the noise value corresponding to the one-third octave band value of the pulsating pressure during the detection operation cycle is within a threshold range of the noise value corresponding to the pulsating pressure.

5. The refrigerator according to any one of claims 2 to 4, characterized in that: The controller is also configured to: When the time between the current moment and the last defrosting moment is greater than or equal to the preset time, the detection operation cycle includes the time of running a stable operation mode and the time of running a defrosting mode; Alternatively, when the time between the current moment and the last defrosting moment is less than a preset time, the detection operation cycle includes the time of running the stable operation mode twice and the time of running the defrosting mode once.

6. The refrigerator according to any one of claims 1 to 4, characterized in that: The controller is also configured to: After the pulsating pressure data exceeds the pulsating pressure threshold, obtaining a fundamental frequency value of the compressor according to the sound pressure data, and obtaining a multiple frequency value of the fundamental frequency value; When the frequency multiplication value satisfies the resonance condition, determining that the compressor does not satisfy the pulsating pressure exceeding limit condition; Alternatively, when the frequency multiplication value does not satisfy the resonance condition, determining that the compressor satisfies the pulsating pressure exceeding limit condition; The resonance condition is that there are a preset number of frequency multiple values ​​that are greater than n times the average sound pressure value, and the average sound pressure value is the average value of (frequency multiple value ± 2 Hz).

7. The refrigerator according to any one of claims 2 to 4, characterized in that: The controller is configured to adjust the speed of the compressor as follows: Based on the initial speed of the current mode of the detection operation cycle, the speed of the compressor is gradually increased from small to large with a preset frequency step within the range of (the initial speed ±3 Hz).

8. The refrigerator according to claim 7, characterized in that: The controller is also configured to: When there is a stable operation mode and / or defrost mode within the detection operation cycle, and the speed of the compressor cannot meet any one of the refrigeration determination condition, the energy consumption determination condition and the noise determination condition by adjusting the speed of the compressor based on the initial speed, for the stable operation mode and / or defrost mode that does not meet the refrigeration determination condition, the energy consumption determination condition and the noise determination condition, the speed of the compressor in other operation modes except the stable operation mode and the defrost mode is used as the new initial speed, and the speed of the compressor is gradually increased from small to large with a preset frequency step within the range of (the new initial speed ±3Hz); For a stable operation mode and / or a defrost mode that meets the refrigeration determination condition, the energy consumption determination condition, and the noise determination condition, the compressor is controlled to operate at an adjusted speed.

9. The refrigerator according to claim 8, characterized in that: The controller is also configured to: After gradually increasing the speed of the compressor from small to large with a preset frequency step within the range of (the new initial speed ±3 Hz), the compressor still cannot meet the refrigeration judgment condition, the energy consumption judgment condition and the noise judgment condition, and the speed of the compressor is adjusted according to the current mode of the detection operation cycle and the judgment results of the compressor for the refrigeration judgment condition, the energy consumption judgment condition and the noise judgment condition.

10. The refrigerator according to claim 9, characterized in that: The controller is also configured to: In the stable operation mode of the detection operation cycle, When the compressor does not meet the refrigeration determination condition or the energy consumption determination condition, controlling the compressor to maintain an initial speed of the current mode of the detection operation cycle; Alternatively, when the compressor satisfies the refrigeration determination condition and the energy consumption determination condition, and the compressor does not satisfy the noise determination condition, the compressor is controlled at a speed corresponding to a noise value with the lowest energy consumption within the range of (the nominal noise value of the refrigerator + m dB), where m≥1; When the sound pressure data of the compressor exceeds (the nominal noise value of the refrigerator+m dB), the compressor is controlled at a speed corresponding to a minimum noise value within a range where the compressor satisfies the refrigeration determination condition and the energy consumption determination condition.

11. The refrigerator according to claim 9, characterized in that: The controller is also configured to: In the defrost mode of the detection operation cycle, The compressor is controlled at a speed corresponding to the minimum noise when the compressor meets the refrigeration determination condition and the energy consumption determination condition, and the defrost determination time is increased by a preset time length, and the defrost mode is operated during a preset daytime period.

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