Refrigerator

Abstract

The refrigerator comprises a controller, and the controller is configured to obtain noise data and the current rotating speed of a compressor when it is determined that a refrigerator door is opened; determining a plurality of target frequencies based on the current rotating speed of the compressor; whether resonance exists in the refrigerator or not is judged based on the multiple target frequencies and the noise data; if yes, the current rotating speed of the compressor is subjected to rotating speed reduction treatment till the first target rotating speed capable of avoiding resonance appears, the compressor is controlled to operate at the first target rotating speed, and otherwise, the compressor is controlled to operate according to the current rotating speed. The noise data and the rotating speed of the compressor can be obtained in real time when the refrigerator door is opened, the resonance phenomenon is recognized according to the noise data and the rotating speed of the compressor, the resonance phenomenon can be avoided by accurately adjusting the rotating speed of the compressor, and therefore resonance noise sensed by a user when the refrigerator door is opened can be effectively reduced, and user experience is improved. And a quiet and comfortable use environment is provided for the user, so that the experience and satisfaction of the user are improved.

Description

Technical Field

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

[0002] In modern refrigerator design, the application of variable-frequency compressors has become an important means to improve energy efficiency and user experience. Variable-frequency compressors can flexibly adjust their rotational speeds according to the set usage conditions, thereby optimizing their own performance under fixed operating conditions and being able to better control energy consumption and noise levels.

[0003] However, in actual usage scenarios, when the user opens the refrigerator door, the distance between the user and the refrigerator shortens, making the noise generated by the compressor more easily perceivable. In addition, due to the differences between different refrigerator products and the possible resonance phenomenon after the refrigerator is loaded with items, the noise problem will be amplified at the moment the refrigerator door is opened, thereby causing dissatisfaction or disgust among users.

[0004] Therefore, there is an urgent need for a method that can identify and avoid potential resonance noise at the moment when the refrigerator door is opened. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0006] To this end, an object of the present invention is to provide a refrigerator, comprising: a box body, inside which a freezer compartment is provided; a door, which is arranged at the opening of the box body and is used to open or close the freezer compartment; a refrigeration system, including a compressor, a condenser, an anti-condensation pipe, a drying filter, a pressure reducer, an evaporator, and a gas-liquid separator, for realizing the compression, condensation, throttling, and evaporation functions of the refrigerator; a noise sensor, which is arranged in the freezer compartment and is used to detect the noise data of the compressor during operation, wherein the noise data includes the sound pressure value of the noise; a controller, which is configured to: when it is determined that the door is opened, obtain the noise data and the current rotational speed of the compressor; determine a plurality of target frequencies based on the current rotational speed of the compressor; judge whether the refrigerator has resonance based on the plurality of target frequencies and the noise data; if so, perform a speed reduction process on the current rotational speed of the compressor until a first target speed that can avoid resonance appears, and then control the compressor to operate at the first target speed, otherwise, control the compressor to operate at the current rotational speed.

[0007] According to the refrigerator of the embodiment of the present invention, noise data and the rotational speed of the compressor can be obtained in real time when the refrigerator door is opened, and resonance phenomena can be identified based on the noise data and the rotational speed of the compressor, and the rotational speed of the compressor can be precisely adjusted to avoid resonance phenomena, so that the resonance noise perceived by the user when opening the refrigerator door can be effectively reduced, providing a quiet and comfortable use environment for the user, and further improving the user experience and satisfaction.

[0008] In some embodiments, when determining a plurality of target frequencies based on the current rotational speed of the compressor, the controller is further configured to: determine the current frequency corresponding to the current rotational speed of the compressor; determine the plurality of target frequencies based on the current frequency.

[0009] The above technical solution has the following beneficial effects: By determining the current frequency corresponding to the current rotational speed of the compressor, and thus determining a plurality of target frequencies, it is convenient to accurately judge whether there is resonance in the refrigerator according to the plurality of target frequencies, so as to facilitate avoiding resonance by adjusting the rotational speed of the compressor when there is a resonance phenomenon.

[0010] In some embodiments, before determining the plurality of target frequencies based on the current frequency, the controller is further configured to: determine a frequency correction range based on a preset correction value and the current frequency; obtain the fluctuation frequency corresponding to the current frequency; use the maximum fluctuation frequency within the frequency correction range among the fluctuation frequencies as the current frequency to correct the current frequency.

[0011] The above technical solution has the following beneficial effects: By introducing a frequency correction mechanism, it ensures that the selection of target frequencies is closer to the actual operating conditions, significantly improving the accuracy of resonance identification.

[0012] In some embodiments, the plurality of target frequencies include the frequencies obtained by multiplying the current frequency by a plurality of different multiples and falling within a preset frequency threshold range.

[0013] The above technical solution has the following beneficial effects: By obtaining the frequencies obtained by multiplying the current frequency by a plurality of different multiples and ensuring that these frequencies fall within the preset frequency threshold range, it is possible to accurately judge whether there is resonance in the refrigerator, so as to facilitate avoiding resonance by adjusting the rotational speed of the compressor when there is a resonance phenomenon.

[0014] In some embodiments, the rotational speed reduction process includes: determining a frequency processing range based on the current frequency; after controlling the current frequency to rise to the upper limit value of the frequency processing range, starting from the upper limit value, performing frequency reduction at a preset time interval and a preset frequency step until the first target frequency appears for the first time, and using the rotational speed corresponding to the first target frequency as the first target rotational speed, where the first target frequency is the frequency that can make the refrigerator avoid resonance.

[0015] The above technical solution has the following beneficial effects: By precisely controlling the change in frequency within the frequency processing range, it is possible to ensure the smoothness of the frequency reduction process while accurately determining the rotational speed of the compressor that avoids resonance, thereby solving the resonance noise problem that occurs after the door is opened.

[0016] In some embodiments, when determining whether the refrigerator has resonance based on the plurality of target frequencies and the noise data, the controller is configured to: obtain the sound pressure values of a plurality of noises when the compressor operates at the rotational speeds corresponding to the plurality of target frequencies; and determine whether the refrigerator has resonance based on the plurality of target frequencies and the sound pressure values of the plurality of noises.

[0017] The above technical solution has the following beneficial effects: By obtaining a plurality of target frequencies and their corresponding noise sound pressure values, it is possible to accurately determine whether the refrigerator has resonance, thereby facilitating the avoidance of resonance by adjusting the rotational speed of the compressor when resonance occurs.

[0018] In some embodiments, when determining whether the refrigerator has resonance based on the plurality of target frequencies and the sound pressure values of the plurality of noises, the controller is configured to: when it is determined that a first preset condition is satisfied, determine that the refrigerator has resonance, and the first preset condition includes: a first ratio of the average value of the plurality of target frequencies to the sound pressure value of the noise corresponding to the current frequency exceeds a first preset ratio threshold.

[0019] The above technical solution has the following beneficial effects: By judging the first ratio of the average value of the plurality of target frequencies to the sound pressure value of the noise corresponding to the current frequency, it is possible to accurately determine whether the refrigerator has resonance, thereby facilitating the avoidance of resonance by adjusting the rotational speed of the compressor when resonance occurs.

[0020] In some embodiments, when determining whether the refrigerator has resonance based on the plurality of target frequencies and the sound pressure values of the plurality of noises, the controller is configured to: when it is determined that a second preset condition is satisfied, determine that the refrigerator has resonance, and the second preset condition includes: a first ratio of the average value of the plurality of target frequencies to the sound pressure value of the noise corresponding to the current frequency exceeds a first preset ratio threshold, and a second ratio of the maximum value of the sound pressure values of the plurality of noises to the average value of the sound pressure values of the plurality of noises exceeds a second preset ratio threshold.

[0021] The above technical solution has the following beneficial effects: By judging the first ratio of the average value of multiple target frequencies to the sound pressure value of the noise corresponding to the current frequency and the second ratio of the maximum value of the sound pressure values of multiple noises to the average value of the sound pressure values of multiple noises, it is possible to more accurately further judge whether the refrigerator has resonance, so as to facilitate avoiding resonance by adjusting the rotational speed of the compressor when resonance occurs.

[0022] In some embodiments, when performing a speed reduction process on the current rotational speed of the compressor, the controller is further configured to: when reducing the frequency starting from the upper limit value until the lower limit value of the frequency processing range is reached and the first target frequency does not appear, obtain the minimum value of the sound pressure values of multiple noises when the compressor operates at the rotational speeds corresponding to the multiple target frequencies; determine the frequency corresponding to the minimum value, use the rotational speed corresponding to the frequency corresponding to the minimum value as the second target rotational speed, and control the compressor to operate at the second target rotational speed.

[0023] The above technical solution has the following beneficial effects: By using the rotational speed corresponding to the frequency corresponding to the minimum value of the sound pressure values of multiple noises when the compressor operates at the rotational speeds corresponding to multiple target frequencies as the operating rotational speed of the compressor, the noise after the refrigerator door is opened can be reduced to the greatest extent, avoiding the bad experience brought to users by abnormal noises.

[0024] In some embodiments, the refrigerator further includes: a temperature sensor for detecting the temperature change value of the freezer compartment during the period from when the refrigerator door is opened to when it is closed, and the controller is further configured to: obtain the temperature change value of the freezer compartment; when the temperature change value exceeds a preset temperature change threshold, control the rotational speed of the compressor based on the operating mode of the refrigerator, where the load levels of the refrigerator are different in different operating modes, and the magnitude of the rotational speed of the compressor is directly proportional to the level of the load.

[0025] The above technical solution has the following beneficial effects: By controlling the rotational speed of the compressor based on the temperature change value and the operating mode of the refrigerator, the problem that the refrigeration effect deteriorates due to the refrigerator door being opened for too long and the temperature changing greatly can be avoided to the greatest extent.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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, where: Figure 1 is a schematic structural diagram of a refrigerator according to an embodiment of the present invention; Figure 2 It is a schematic structural diagram of a refrigerator according to another embodiment of the present invention; Figure 3 It is a schematic structural diagram of a refrigeration system according to an embodiment of the present invention; Figure 4 It is a schematic diagram of the flow direction of the refrigerant during refrigeration according to an embodiment of the present invention; Figure 5 It is a schematic structural diagram of a controller according to an embodiment of the present invention; Figure 6 It is a schematic structural diagram of a refrigerator according to another embodiment of the present invention; Figure 7 It is a schematic flow diagram of a control method for a refrigerator according to another embodiment of the present invention. Detailed Embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0030] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0031] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Combined with Figure 1 and Figure 6 As shown, the refrigerator 10 of this embodiment includes, but is not limited to, an approximately cuboid shape. The refrigerator 10 includes a box body 100 that defines a storage space and a plurality of box doors 200 provided at the opening of the box body 100. Among them, as Figure 2 shown, the box door 200 includes a box door outer shell 210 located outside the box body 100, a box door inner liner 220 located inside the box body 100, an upper end cover 230, a lower end cover 240, and a heat insulation layer located between the box door outer shell 210, the box door inner liner 220, the upper end cover 230, and the lower end cover 240; generally, the heat insulation layer is filled with foaming material. The box body 100 is provided with a chamber, and the chamber includes a component storage chamber for placing components in the refrigerator 10, such as a compressor, a blower, etc., and also includes a storage space for storing food, medicines, etc.

[0033] As Figure 3 shown, Figure 3 is a schematic structural diagram of the refrigeration system in the refrigerator 10 provided by an embodiment of the present invention. The refrigeration system includes a compressor 1, a condenser 2, an anti-condensation pipe 3, a drying filter 4, a pressure reducer 5, an evaporator 6, and a gas-liquid separator 7. The working process of the refrigeration system includes a compression process, a condensation process, a throttling process, and an evaporation process. Among them, the compression process is as follows: Plug in the power cord of the refrigerator 10. When the contacts of the thermostat are closed, the compressor 1 starts to work. The low-temperature and low-pressure refrigerant is sucked into the compressor 1 and compressed into a high-temperature and high-pressure superheated gas in the cylinder of the compressor 1 and then discharged into the condenser 2; the condensation process is as follows: The high-temperature and high-pressure refrigerant gas dissipates heat through the condenser 2, and the temperature continuously drops, gradually being cooled into a normal-temperature and high-pressure saturated vapor, and further cooled into a saturated liquid, and the temperature no longer drops. At this time, the temperature is called the condensation temperature, and the pressure of the refrigerant is almost unchanged during the entire condensation process; the throttling process is as follows: The condensed refrigerant saturated liquid flows through the drying filter 4 to filter out moisture and impurities and then flows into the pressure reducer 5 (such as a capillary tube), and throttles and reduces the pressure through it, and the refrigerant becomes a normal-temperature and low-pressure wet vapor; the evaporation process is as follows: The normal-temperature and low-pressure wet vapor starts to absorb heat and vaporize in the evaporator 6, not only reducing the temperature of the evaporator and its surroundings, but also turning the refrigerant into a low-temperature and low-pressure gas. The refrigerant coming out of the evaporator 6 returns to the compressor 1 again after passing through the gas-liquid separator 7. Repeating the above process, the heat in the refrigerator 10 is transferred to the air outside the box, achieving the purpose of refrigeration. The flow direction of the refrigerant can also be seen in Figure 4 shown.

[0034] In addition, the refrigerator 10 is provided with a controller 71 to control the operation of each component in the internal refrigerator 10, so that each component of the refrigerator 10 operates to achieve each predetermined function of the refrigerator 10. Among them, a control device is also attached to the refrigerator 10, and the control device has a function of communicating with the controller 71 by using, for example, infrared rays or other communication methods. The control device is used for various controls of the refrigerator 10 by the user to realize the interaction between the user and the refrigerator 10.

[0035] The embodiment of the present application also provides a schematic diagram of the hardware structure of the controller 71, as Figure 5 shown. The controller 71 includes a processor 83. Optionally, it further includes a memory 82 and a communication interface 84 connected to the processor 83. The processor 83, the memory 82, and the communication interface 84 are connected through a bus 81.

[0036] The processor 83 may be a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The processor 83 may also be any other device with processing functions, such as a circuit, a device, or a software module. The processor 83 may also include multiple CPUs, and the processor 83 may be a single-CPU processor or a multi-CPU processor. Here, the processor 83 may refer to one or more devices, circuits, or processing cores for processing data (such as computer programs).

[0037] The memory 82 can be a read-only memory (ROM), or other types of static storage devices that can store static information, a random access memory (RAM), or other types of dynamic storage devices that can store information. It can also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM), or other optical disc storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media, or other magnetic storage devices, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer. The embodiments of the present application do not impose any restrictions on this. The memory 82 can exist independently or be integrated with the processor 83. Among them, the memory 82 can contain computer program code. The processor 83 is used to execute the computer program code stored in the memory 82, so as to implement the control method of the refrigerator 10 provided by the embodiments of the present application.

[0038] The communication interface 84 can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc.). The communication interface 84 can be a module, a circuit, a transceiver, or any device that can achieve communication.

[0039] The bus 81 can be a peripheral component interconnect (PCI) bus 81 or an extended industry standard architecture (EISA) bus 81, etc. The bus 81 can be divided into an address bus 81, a data bus 81, a control bus 81, etc.

[0040] Next, in conjunction with Figures 6 - 7 Describe the refrigerator 10 and its control method according to the embodiments of the present invention.

[0041] In some embodiments, as Figure 6 shown, the refrigerator 10 includes: a cabinet 100, and a freezer compartment is provided inside the cabinet 100.

[0042] In some embodiments, as Figure 6As shown, the refrigerator 10 further includes: a door 200 provided at the opening of the cabinet 100 for opening or closing the freezer compartment.

[0043] In some embodiments, as Figure 6 shown, the refrigerator 10 further includes: a refrigeration system 300 including a compressor, a condenser, an anti-condensation tube, a dryer filter, a pressure reducer, an evaporator, and a gas-liquid separator for realizing the compression, condensation, throttling, and evaporation functions of the refrigerator 10.

[0044] In some embodiments, as Figure 6 shown, the refrigerator 10 further includes: a noise sensor 400 disposed in the freezer compartment for detecting noise data of the compressor during operation, where the noise data includes the sound pressure value of the noise.

[0045] In some embodiments, as Figure 6 shown, the refrigerator 10 further includes: a controller 71 configured to: when determining that the door 200 is opened, obtain the noise data and the current speed of the compressor; determine a plurality of target frequencies based on the current speed of the compressor; determine whether the refrigerator 10 has resonance based on the plurality of target frequencies and the noise data; if so, perform a speed reduction process on the current speed of the compressor until a first target speed that can avoid resonance appears, and then control the compressor to operate at the first target speed; otherwise, control the compressor to operate at the current speed.

[0046] Specifically, in the refrigerator 10, a door switch (such as a magnetic switch or a photoelectric switch) sensor is usually provided to monitor the position of the door 200 in real time to obtain the status information of the door 200 (that is, whether the door 200 of the refrigerator 10 is currently open or closed). When it is detected that the door 200 is opened, the door switch sensor can immediately send a door 200 opening signal to the controller 71, indicating that the door 200 is currently in an open state. At this time, the noise sensor 400 inside the freezer compartment of the refrigerator 10 starts to detect the noise data of the compressor on the same horizontal plane during operation and sends it to the controller 71. At the same time, the controller 71 can obtain the current speed of the compressor through a sensor connected to the compressor.

[0047] Further, after obtaining the current speed of the compressor, to facilitate determining whether the refrigerator 10 has a resonance phenomenon based on the sound pressure value of the noise corresponding to different frequencies, a plurality of target frequencies can be determined based on the current speed of the compressor, and it can be determined whether the refrigerator 10 has resonance based on the plurality of target frequencies and the noise data, including but not limited to substituting the target frequencies and the corresponding sound pressure values of the noise into a preset algorithm and judging whether the refrigerator 10 has resonance when the compressor operates at the current speed according to the algorithm result.

[0048] Further, if it is determined that the refrigerator 10 has a resonance phenomenon, the compressor can be controlled to reduce its rotational speed, so as to reduce the vibration frequency generated by the compressor. At the same time, during the process of reducing the rotational speed, it can be continuously determined whether the refrigerator 10 has a resonance phenomenon according to the reduced rotational speed. Until the lowest feasible rotational speed that can avoid resonance, that is, the first target rotational speed, is reached, the compressor can be controlled to operate stably at the first target rotational speed to avoid the occurrence of resonance; if it is determined that the refrigerator 10 does not have a resonance phenomenon, the compressor can be controlled to operate at the current rotational speed, that is, the compressor is controlled to continue to operate at the current efficiency and refrigeration capacity to meet the refrigeration demand.

[0049] According to the refrigerator 10 of the embodiment of the present invention, the noise data and the rotational speed of the compressor can be obtained in real time when the refrigerator 10 is opened, so as to determine whether the refrigerator 10 has a resonance phenomenon. When the refrigerator 10 has a resonance phenomenon, the rotational speed of the compressor can be precisely adjusted by reducing the rotational speed until the lowest feasible rotational speed that can avoid resonance is reached, and the compressor is controlled to operate at the reduced rotational speed to avoid the resonance phenomenon, thereby effectively reducing the resonance noise perceived by the user when opening the door of the refrigerator 10, providing a quiet and comfortable use environment for the user, and further improving the user experience and satisfaction.

[0050] In an embodiment of the present invention, when determining multiple target frequencies based on the current rotational speed of the compressor, the controller 71 is further configured to: determine the current frequency corresponding to the current rotational speed of the compressor; Determine multiple target frequencies based on the current frequency.

[0051] Specifically, since there is a direct relationship between the rotational speed of the compressor and the vibration frequency it generates, therefore, the current frequency corresponding to the current rotational speed can be determined based on the known rotational speed-frequency relationship, including but not limited to calculating through an empirical formula obtained from experimental data, such as the following formula: , where represents the current rotational speed of the compressor, represents the current frequency corresponding to the current rotational speed of the compressor. If the current rotational speed of the compressor is 3600 rpm, then the current frequency corresponding to the current rotational speed of the compressor is 60 Hz.

[0052] Further, after determining the current frequency corresponding to the current rotational speed of the compressor, multiple target frequencies can be determined based on the current frequency, so as to facilitate determining whether the refrigerator 10 has a resonance according to the multiple target frequencies, and thus facilitate avoiding resonance by adjusting the rotational speed of the compressor when there is a resonance phenomenon.

[0053] In an embodiment of the present invention, before determining multiple target frequencies based on the current frequency, the controller 71 is further configured to: determine a frequency correction range based on a preset correction value and the current frequency; Obtain the fluctuation frequency corresponding to the current frequency; Use the maximum fluctuation frequency within the frequency correction range in the fluctuation frequency as the current frequency to correct the current frequency.

[0054] Specifically, since the rotational speed of the compressor is not an exact value and there will be corresponding fluctuations, and the frequency corresponding to it will also fluctuate. Therefore, before determining multiple target frequencies based on the current frequency, the current frequency can be corrected to ensure that the selection of the target frequency is closer to the actual operating conditions. For example, the preset correction value can be determined based on experience and experimental data, comprehensively considering the fluctuations of the compressor rotational speed and frequency, and the frequency correction range is determined based on the preset correction value and the current frequency. Among them, the upper limit value of the frequency correction range can be the sum value of the preset correction value and the current frequency, and the lower limit value of the frequency correction range can be the difference value between the preset correction value and the current frequency.

[0055] Furthermore, the rotational speed fluctuation data during operation at the current rotational speed of the compressor can be obtained, and the fluctuation frequency existing near the current frequency is determined based on the rotational speed fluctuation data, that is, the frequency reflecting the small rotational speed changes during the actual operation of the compressor.

[0056] Furthermore, among the obtained fluctuation frequency data, the frequency values within the frequency correction range are screened out, and the largest frequency value within the frequency correction range is found as the new current frequency to correct the current frequency. For example, if the preset correction value is 1 Hz and the current frequency is 60 Hz, then the frequency correction range is 59 Hz - 61 Hz. When there are 59.1 Hz, 60.2 Hz, and 60.9 Hz in the fluctuation frequency data, 60.9 Hz can be selected as the new current frequency. It can be understood that the maximum fluctuation frequency represents the highest operating frequency that may be reached within the correction range and is also the frequency value that can best reflect the current operating state of the compressor. Based on the maximum fluctuation frequency, the resonance phenomenon existing in the refrigerator 10 can be judged more accurately.

[0057] In an embodiment of the present invention, the multiple target frequencies include multiple frequencies obtained by multiplying the current frequency by multiple different multiples and falling within a preset frequency threshold range.

[0058] Specifically, since the compressor is not prone to resonance at higher frequencies, a preset frequency threshold range can be set based on experience and experimental data, etc., to obtain multiple target frequencies within the preset frequency threshold range. Among them, the multiple target frequencies include multiple different frequencies obtained by multiplying the current frequency by multiple different multiples. For example, assume that the preset frequency threshold range is 0 - 1000 Hz. If the current speed of the compressor is 3600 rpm, the calculated corresponding current frequency is 60 Hz. Then, the different frequencies in a multiple relationship with the current frequency include 60 Hz, 120 Hz, 180 Hz, 240 Hz... 960 Hz, 1020 Hz. Among them, since 1020 Hz is greater than 1000 Hz, the multiple target frequencies are 60 Hz, 120 Hz, 180 Hz, 240 Hz... 960 Hz, that is, the frequencies less than 1000 Hz.

[0059] In an embodiment of the present invention, the speed reduction process includes: determining a frequency processing range based on the current frequency; After controlling the current frequency to rise to the upper limit value of the frequency processing range, starting from the upper limit value, frequency reduction is performed at a preset time interval and a preset frequency step until the first target frequency first appears. Then, the speed corresponding to the first target frequency is used as the first target speed, where the first target frequency is a frequency that can enable the refrigerator 10 to avoid resonance.

[0060] Specifically, before starting the speed reduction process, to ensure that the frequency region that may cause the refrigerator 10 to resonate can be covered during the frequency reduction process, a frequency processing range can be determined based on the current frequency and combined with experience and experimental data, etc. The frequency processing range includes an upper limit value and a lower limit value. For example, assume that the current frequency is 60 Hz. Then, the upper limit value of the frequency processing range can be 65 Hz, and the lower limit value of the frequency processing range can be 55 Hz.

[0061] Furthermore, after determining the frequency processing range, the current frequency can be adjusted to the upper limit value of the frequency processing range, and starting from the upper limit value, the current frequency is gradually reduced at a preset time interval and frequency step, and resonance judgment is performed each time it is reduced until the first frequency that can enable the refrigerator 10 to avoid resonance, that is, the first target frequency, appears. Then, the speed corresponding to the first target frequency can be used as the first target speed to control the compressor to operate at the first target speed, thereby avoiding resonance.

[0062] In an embodiment of the present invention, when determining whether the refrigerator 10 has resonance based on multiple target frequencies and noise data, the controller 71 is configured to: obtain the sound pressure values of multiple noises when the compressor operates at the speeds corresponding to multiple target frequencies; Judge whether the refrigerator 10 has resonance based on multiple target frequencies and the sound pressure values of multiple noises.

[0063] Specifically, when determining whether the refrigerator 10 has resonance based on multiple target frequencies and noise data, the sound pressure values of multiple noises when the compressor operates at the rotational speeds corresponding to the multiple target frequencies can be obtained. That is, the controller 71 can record the sound pressure values of the noises when the compressor operates at each target frequency, reflecting the operating state of the compressor at different frequencies.

[0064] Furthermore, it is possible to determine whether the refrigerator 10 has resonance based on multiple target frequencies and the sound pressure values of multiple noises, including but not limited to substituting the multiple target frequencies and the sound pressure values of multiple noises into a preset algorithm, and determining whether the refrigerator 10 has resonance when the compressor operates at the current frequency according to the algorithm result.

[0065] In an embodiment of the present invention, when determining whether the refrigerator 10 has resonance based on multiple target frequencies and the sound pressure values of multiple noises, the controller 71 is configured to: when it is determined that the first preset condition is satisfied, determine that the refrigerator 10 has resonance, and the first preset condition includes: the first ratio of the average value of the multiple target frequencies to the sound pressure value of the noise corresponding to the current frequency exceeds the first preset ratio threshold.

[0066] Specifically, after obtaining the sound pressure values of multiple noises when the compressor operates at the rotational speeds corresponding to the multiple target frequencies, the controller 71 can calculate the average value of the sound pressure values of the multiple noises according to the algorithm preset in it, that is, the average noise intensity when the compressor operates at the multiple target frequencies. Furthermore, it can be determined whether the first ratio of the average value of the multiple target frequencies to the sound pressure value of the noise corresponding to the current frequency exceeds the first preset ratio threshold, that is, whether the first preset condition is satisfied. If so, it means that the deviation degree of the noise intensity at the current frequency relative to the average noise intensity is relatively large, that is, the noise intensity at the current frequency is high enough, and it can be determined that the refrigerator 10 has resonance at the current frequency. Among them, the first preset condition can be expressed by the following formula: , where represents the average value of the multiple target frequencies, represents the sound pressure value of the noise corresponding to the current frequency, represents the first preset ratio threshold.

[0067] In a specific embodiment, the first preset ratio threshold can be set according to the type of the product and experimental data.

[0068] In one embodiment of the present invention, when determining whether the refrigerator 10 has resonance based on the sound pressure values of multiple target frequencies and multiple noises, the controller 71 is configured to: when it is determined that the second preset condition is satisfied, determine that the refrigerator 10 has resonance, and the second preset condition includes: the first ratio of the average value of the multiple target frequencies to the sound pressure value of the noise corresponding to the current frequency exceeds the first preset ratio threshold, and the second ratio of the maximum value of the sound pressure values of the multiple noises to the average value of the sound pressure values of the multiple noises exceeds the second preset ratio threshold.

[0069] Specifically, after obtaining the sound pressure values of multiple noises when the compressor operates at the rotational speeds corresponding to multiple target frequencies, it is also possible to, when the first ratio of the average value of the multiple target frequencies to the sound pressure value of the noise corresponding to the current frequency exceeds the first preset ratio threshold, determine whether the second ratio of the maximum value of the sound pressure values of the multiple noises to the average value of the sound pressure values of the multiple noises exceeds the second preset ratio threshold, that is, whether the second preset condition is satisfied. If so, it indicates that the noise intensity at the current frequency significantly deviates from the average noise intensity, that is, the noise intensity at the current frequency is high enough, and it is possible to further accurately determine that the refrigerator 10 has resonance at the current frequency, that is, the current frequency is secondarily locked as the resonance frequency. Among them, the second preset condition can be expressed by the following formula: , and , where represents the average value of the multiple target frequencies, represents the sound pressure value of the noise corresponding to the current frequency, represents the first preset ratio threshold, represents the maximum value of the sound pressure values of the multiple noises, represents the second preset ratio threshold.

[0070] In a specific embodiment, the second preset ratio threshold can be set according to the type of the product and experimental data.

[0071] In one embodiment of the present invention, when performing a speed reduction process on the current rotational speed of the compressor, the controller 71 is further configured to: when reducing the frequency starting from the upper limit value until reaching the lower limit value of the frequency processing range, if the first target frequency does not appear, obtain the minimum value among the sound pressure values of the multiple noises when the compressor operates at the rotational speeds corresponding to multiple target frequencies; Determine the frequency corresponding to the minimum value, use the rotational speed corresponding to the frequency corresponding to the minimum value as the second target rotational speed, and control the compressor to operate at the second target rotational speed.

[0072] Specifically, when reducing the current speed of the compressor, if the controller 71 controls the compressor to reduce the frequency starting from the upper limit value of the frequency processing range until reaching the lower limit value of the frequency processing range and the first target frequency still does not appear, at this time, the minimum value among the sound pressure values of multiple noises when the compressor operates at the speeds corresponding to multiple target frequencies can be obtained, that is, the sound pressure value corresponding to the frequency with the lowest noise intensity.

[0073] Furthermore, when determining the minimum value of the noise sound pressure value, the frequency corresponding to the minimum value of the noise sound pressure value can be determined, and the corresponding speed can be found based on this frequency as the second target speed, and the compressor is controlled to operate at the second target speed. It can be understood that the second target speed is the speed at which the compressor can operate at the lowest noise level under the current conditions. By controlling the compressor to operate at the second target speed, the noise generated during the operation of the compressor can be reduced to the greatest extent, providing a quiet and comfortable use environment for users and improving the user experience and satisfaction.

[0074] In an embodiment of the present invention, the refrigerator 10 further includes: a temperature sensor for detecting the temperature change value of the freezer compartment during the period from when the door 200 of the refrigerator 10 is opened to when it is closed, and the controller 71 is further configured to: obtain the temperature change value of the freezer compartment; When the temperature change value exceeds a preset temperature change threshold, the speed of the compressor is controlled based on the operating mode of the refrigerator 10, where the load levels of the refrigerator 10 are different in different operating modes, and the magnitude of the speed of the compressor is proportional to the level of the load.

[0075] Specifically, a temperature sensor is also provided in the refrigerator 10, including but not limited to being provided inside the freezer compartment, for detecting the temperature change value of the freezer compartment during the period from when the door 200 of the refrigerator 10 is opened to when it is closed and sending it to the controller 71.

[0076] Furthermore, when the temperature change value exceeds the preset temperature change threshold, the speed of the compressor can be controlled based on the operating mode of the refrigerator 10 to accelerate the temperature reduction in the freezer compartment, avoiding the deterioration of the refrigeration effect caused by a large temperature change in the freezer compartment and the adverse effects brought by the unnecessary high-load operation of the refrigerator 10. For example, the refrigerator 10 usually has multiple operating modes, such as a normal operating mode, a high-load mode (such as a defrost recovery period, a first power-on cycle, etc.), and the load levels of the refrigerator 10 are different in each mode.

[0077] In a specific embodiment, if the operating mode of the refrigerator 10 is a normal operating cycle, the rotation speed of the compressor is controlled to increase to the lowest gear of the high-load mode for operation until the temperature change value does not exceed the preset temperature change threshold and then the machine stops. If the operating mode of the refrigerator 10 is a high-load cycle, the rotation speed of the compressor is controlled to shift up for operation until the temperature change value does not exceed the preset temperature change threshold and then the machine stops.

[0078] According to the refrigerator 10 of the embodiment of the present invention, noise data and the rotation speed of the compressor can be obtained in real time when the refrigerator 10 door is opened, and resonance phenomena can be identified based on the noise data and the rotation speed of the compressor, and the rotation speed of the compressor can be precisely adjusted to avoid resonance phenomena, so that the resonance noise perceived by the user when opening the refrigerator 10 door can be effectively reduced, providing a quiet and comfortable use environment for the user, and further improving the user experience and satisfaction. Further, when reducing the rotation speed of the current rotation speed of the compressor, when the first target frequency does not appear, the compressor can be controlled to operate at the second target rotation speed determined by the frequency corresponding to the minimum value of the sound pressure values of multiple noises, so as to reduce the noise generated during the operation of the compressor to the greatest extent, and further provide a quiet and comfortable use environment for the user, improving the user experience and satisfaction. Further, when the temperature change value of the freezer compartment during the period from when the door 200 is opened to when it is closed exceeds the preset temperature change threshold, the rotation speed of the compressor can be controlled based on the operating mode of the refrigerator 10 to accelerate the temperature reduction in the freezer compartment, avoiding the deterioration of the refrigeration effect caused by a large temperature change in the freezer compartment and the adverse effects brought by unnecessary high-load operation of the refrigerator 10.

[0079] Next, refer to Figure 7 to describe the control method of the refrigerator according to the embodiment of the present invention.

[0080] As Figure 7 shown, the control method of the refrigerator according to the embodiment of the present invention at least includes step S1-step S4.

[0081] Step S1, when it is determined that the door is opened, obtain the noise data and the current rotation speed of the compressor.

[0082] Step S2, determine multiple target frequencies based on the current rotation speed of the compressor.

[0083] Step S3, determine whether there is resonance in the refrigerator based on the multiple target frequencies and the noise data.

[0084] Step S4, if there is resonance, perform a speed reduction process on the current rotation speed of the compressor until the first target rotation speed that can avoid resonance appears, and then control the compressor to operate at the first target rotation speed. Otherwise, control the compressor to operate at the current rotation speed.

[0085] In some embodiments, determining a plurality of target frequencies based on the current rotational speed of the compressor specifically includes: determining the current frequency corresponding to the current rotational speed of the compressor; and determining a plurality of target frequencies based on the current frequency.

[0086] In some embodiments, before determining a plurality of target frequencies based on the current frequency, it further includes: determining a frequency correction range based on a preset correction value and the current frequency; obtaining the fluctuation frequency corresponding to the current frequency; and taking the maximum fluctuation frequency within the frequency correction range among the fluctuation frequencies as the current frequency to correct the current frequency.

[0087] In some embodiments, the plurality of target frequencies include the frequencies obtained by multiplying the current frequency by a plurality of different multiples and falling within a preset frequency threshold range.

[0088] In some embodiments, the rotational speed reduction process includes: determining a frequency processing range based on the current frequency; after controlling the current frequency to rise to the upper limit value of the frequency processing range, starting from the upper limit value, reducing the frequency at preset time intervals and preset frequency steps until the first target frequency appears for the first time, and taking the rotational speed corresponding to the first target frequency as the first target rotational speed, where the first target frequency is a frequency that can enable the refrigerator to avoid resonance.

[0089] In some embodiments, determining whether the refrigerator has resonance based on the plurality of target frequencies and the noise data specifically includes: obtaining the sound pressure values of a plurality of noises when the compressor operates at the rotational speeds corresponding to the plurality of target frequencies; and determining whether the refrigerator has resonance based on the plurality of target frequencies and the sound pressure values of the plurality of noises.

[0090] In some embodiments, determining whether the refrigerator has resonance based on the plurality of target frequencies and the sound pressure values of the plurality of noises specifically includes: when it is determined that the first preset condition is satisfied, determining that the refrigerator has resonance, and the first preset condition includes: the first ratio of the average value of the plurality of target frequencies to the sound pressure value of the noise corresponding to the current frequency exceeds the first preset ratio threshold.

[0091] In some embodiments, determining whether the refrigerator has resonance based on the plurality of target frequencies and the sound pressure values of the plurality of noises specifically includes: when it is determined that the second preset condition is satisfied, determining that the refrigerator has resonance, and the second preset condition includes: the first ratio of the average value of the plurality of target frequencies to the sound pressure value of the noise corresponding to the current frequency exceeds the first preset ratio threshold, and the second ratio of the maximum value of the sound pressure values of the plurality of noises to the average value of the sound pressure values of the plurality of noises exceeds the second preset ratio threshold.

[0092] In some embodiments, when performing a speed reduction process on the current speed of the compressor, it further includes: when reducing the frequency starting from the upper limit value until reaching the lower limit value of the frequency processing range, if the first target frequency does not appear, obtain the minimum value among the sound pressure values of multiple noises when the compressor operates at speeds corresponding to multiple target frequencies; determine the frequency corresponding to the minimum value, use the speed corresponding to the frequency corresponding to the minimum value as the second target speed, and control the compressor to operate at the second target speed.

[0093] In some embodiments, the refrigerator further includes: a temperature sensor for detecting the temperature change value of the freezer compartment during the period from when the refrigerator door is opened to when it is closed. The control method of the refrigerator further includes: obtaining the temperature change value of the freezer compartment; when the temperature change value exceeds a preset temperature change threshold, controlling the speed of the compressor based on the operating mode of the refrigerator, where the load levels of the refrigerator are different under different operating modes, and the magnitude of the speed of the compressor is directly proportional to the level of the load.

[0094] According to the control method of the refrigerator in the embodiments of the present invention, it is possible to obtain noise data and the compressor speed in real time when the refrigerator door is opened to determine whether there is a resonance phenomenon in the refrigerator. When there is a resonance phenomenon in the refrigerator, through the speed reduction process, the speed of the compressor is precisely adjusted until the lowest feasible speed that can avoid resonance appears, and the compressor is controlled to operate at the reduced speed to avoid the resonance phenomenon, thereby effectively reducing the resonance noise perceived by the user when opening the refrigerator door, providing a quiet and comfortable use environment for the user, and further improving the user experience and satisfaction. Further, when performing a speed reduction process on the current speed of the compressor, when the first target frequency does not appear, the compressor can be controlled to operate at the second target speed determined by the frequency corresponding to the minimum value among the sound pressure values of multiple noises, so as to minimize the noise generated during the operation of the compressor, further providing a quiet and comfortable use environment for the user and improving the user experience and satisfaction. Further, when the temperature change value of the freezer compartment during the period from when the refrigerator door is opened to when it is closed exceeds the preset temperature change threshold, the speed of the compressor can be controlled based on the operating mode of the refrigerator to accelerate the temperature reduction in the freezer compartment, avoiding the deterioration of the refrigeration effect caused by a large temperature change in the freezer compartment and the adverse effects brought by unnecessary high-load operation of the refrigerator.

[0095] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative 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 representations of the above terms do not necessarily refer to the same embodiment or example.

[0096] Although 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 spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A refrigerator, characterized in that, Including: A box body, inside which a freezer compartment is provided; A box door, which is arranged at the opening of the box body and is used to open or close the freezer compartment; A refrigeration system, including a compressor, a condenser, an anti-condensation pipe, a drying filter, a pressure reducer, an evaporator, and a gas-liquid separator, which is used to realize the compression, condensation, throttling, and evaporation functions of the refrigerator; A noise sensor, which is arranged in the freezer compartment and is used to detect the noise data of the compressor during operation, wherein the noise data includes the sound pressure value of the noise; A controller, which is configured as follows: When it is determined that the box door is opened, obtain the noise data and the current rotational speed of the compressor; Determine a plurality of target frequencies based on the current rotational speed of the compressor; Judge whether the refrigerator has resonance based on the plurality of target frequencies and the noise data; If so, perform a rotational speed reduction process on the current rotational speed of the compressor until a first target rotational speed that can avoid resonance appears, and then control the compressor to operate at the first target rotational speed. Otherwise, control the compressor to operate at the current rotational speed.

2. The refrigerator according to claim 1, wherein, When determining a plurality of target frequencies based on the current rotational speed of the compressor, the controller is further configured as follows: Determine the current frequency corresponding to the current rotational speed of the compressor; Determine the plurality of target frequencies based on the current frequency.

3. The refrigerator according to claim 2, characterized in that, Before determining the plurality of target frequencies based on the current frequency, the controller is further configured as follows: Determine a frequency correction range based on a preset correction value and the current frequency; Obtain the fluctuation frequency corresponding to the current frequency; Take the maximum fluctuation frequency within the frequency correction range in the fluctuation frequency as the current frequency to correct the current frequency.

4. The refrigerator according to claim 2 or 3, characterized in that, The plurality of target frequencies include the frequencies obtained by multiplying the current frequency by a plurality of different multiples and falling within a preset frequency threshold range.

5. The refrigerator according to claim 1, characterized in that, The rotational speed reduction process includes: Determine a frequency processing range based on the current frequency; Control the current frequency to rise to the upper limit value of the frequency processing range, and then start from the upper limit value, perform frequency reduction at a preset time interval and a preset frequency step until the first target frequency appears for the first time, and take the rotational speed corresponding to the first target frequency as the first target rotational speed, wherein the first target frequency is the frequency that can make the refrigerator avoid resonance.

6. The refrigerator according to claim 1, characterized in that, When judging whether the refrigerator has resonance based on the plurality of target frequencies and the noise data, the controller is configured as follows: Obtain the sound pressure values of a plurality of noises when the compressor operates at the rotational speeds corresponding to the plurality of target frequencies; Judge whether the refrigerator has resonance based on the plurality of target frequencies and the sound pressure values of the plurality of noises.

7. The refrigerator according to claim 6, characterized in that, When judging whether the refrigerator has resonance based on the plurality of target frequencies and the sound pressure values of the plurality of noises, the controller is configured as follows: When it is determined that a first preset condition is satisfied, determine that the refrigerator has resonance. The first preset condition includes: the first ratio of the average value of the plurality of target frequencies to the sound pressure value of the noise corresponding to the current frequency exceeds a first preset ratio threshold.

8. The refrigerator according to claim 6, wherein, When determining whether the refrigerator has resonance based on the sound pressure values of the multiple target frequencies and the multiple noises, the controller is configured to: When it is determined that the second preset condition is satisfied, it is determined that the refrigerator has resonance. The second preset condition includes: a first ratio of an average value of the multiple target frequencies to a sound pressure value of the noise corresponding to the current frequency exceeds a first preset ratio threshold, and a second ratio of a maximum value of the sound pressure values of the multiple noises to an average value of the sound pressure values of the multiple noises exceeds a second preset ratio threshold.

9. The refrigerator according to claim 5, characterized in that, When performing a speed reduction process on the current speed of the compressor, the controller is further configured to: When reducing the frequency starting from the upper limit value until the lower limit value of the frequency processing range is reached and the first target frequency does not appear, obtain a minimum value among the sound pressure values of the multiple noises when the compressor operates at the speeds corresponding to the multiple target frequencies; Determine the frequency corresponding to the minimum value, use the speed corresponding to the frequency corresponding to the minimum value as the second target speed, and control the compressor to operate at the second target speed.

10. The refrigerator according to claim 1, characterized in that, Further includes: A temperature sensor for detecting a temperature change value of the freezer compartment during a period from when the refrigerator door is opened to when it is closed. The controller is further configured to: Obtain the temperature change value of the freezer compartment; When the temperature change value exceeds a preset temperature change threshold, control the speed of the compressor based on the operating mode of the refrigerator. Among them, the load levels of the refrigerator are different in different operating modes, and the magnitude of the speed of the compressor is directly proportional to the level of the load.

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