Refrigerator

Abstract

The invention provides a refrigerator which comprises a controller, and the controller is configured to determine the required rotating speed of a refrigerator door driving mechanism in response to an instruction when the instruction used for triggering the refrigerator door driving mechanism is received, and obtain the rotating speed of a compressor when the refrigerator is in a starting state; whether resonance exists between the compressor and the box door driving mechanism is judged based on the compressor rotating speed and the required rotating speed; if yes, the rotating speed of the compressor is adjusted based on the required rotating speed until resonance is avoided, the compressor is controlled to operate according to the adjusted rotating speed of the compressor, and a box door driving mechanism is controlled to operate at the required rotating speed so as to drive a box door to be opened or closed, and if not, the compressor is controlled to operate at the rotating speed of the compressor, and the refrigerator door driving mechanism is controlled to operate at the required rotating speed to drive the refrigerator door to be opened or closed, so that abnormal noise caused by resonance of the compressor and the refrigerator door driving mechanism when the refrigerator door is opened can be effectively avoided, and the experience feeling and satisfaction degree of a user are improved.

Description

Technical Field

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

[0002] With the improvement of the quality of modern home life, as an indispensable electrical appliance in family life, the demand for intelligent operation of refrigerators is increasing day by day. However, the traditional way of opening or closing the refrigerator door often relies on manual operation, which is time-consuming and laborious, affecting the user experience.

[0003] To solve this problem, refrigerators with automatic door opening and closing technologies have emerged. However, during the process of automatic door opening or closing of the refrigerator, due to the possible resonance between the components of the refrigerator, the perceivable noise during door opening or closing is often relatively large, affecting the mute performance of the refrigerator and the user satisfaction.

[0004] Therefore, how to avoid resonance and reduce noise during the door opening and closing processes has become an urgent problem to be solved in the current refrigerator door opening and closing technology. Summary of the Invention

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

[0006] For this purpose, an object of the present invention is to provide a refrigerator, comprising: a box body; a door, which is arranged at the opening of the refrigerator box body; a refrigeration system, which is arranged inside the refrigerator box body and includes a compressor and a blower; a door driving mechanism, connected to the door and used to drive the door to open or close; a rotational speed sensor, used to detect the rotational speed of the compressor; a controller, which is configured to: when receiving an instruction for triggering the door driving mechanism, in response to the instruction, determine the required rotational speed of the door driving mechanism, and obtain the current operating state of the compressor; if the compressor is currently in an unstarted state, control the door driving mechanism to operate at the required rotational speed to drive the door to open or close; if the compressor is currently in a started state, obtain the rotational speed of the compressor, and based on the rotational speed of the compressor and the required rotational speed, determine whether there is resonance between the compressor and the door driving mechanism; if so, adjust the rotational speed of the compressor based on the required rotational speed until resonance is avoided, then control the compressor to operate at the adjusted rotational speed of the compressor, and control the door driving mechanism to operate at the required rotational speed to drive the door to open or close; if not, control the compressor to operate at the rotational speed of the compressor, and control the door driving mechanism to operate at the required rotational speed to drive the door to open or close.

[0007] According to the refrigerator of the embodiment of the present invention, when receiving an instruction for triggering the door driving mechanism to drive the refrigerator door to open or close and the compressor is currently in a starting state, it can accurately determine whether there is resonance between the compressor and the door driving mechanism based on the compressor speed and the required speed of the door driving mechanism. In the case of resonance, the compressor speed is precisely adjusted based on the required speed until the resonance is avoided. Then, the compressor is controlled to operate at the adjusted compressor speed, and the door driving mechanism is controlled to operate at the required speed, thereby effectively avoiding abnormal noise caused by resonance between the compressor and the door driving mechanism when the refrigerator door is opened, and further improving the user experience and satisfaction.

[0008] In some embodiments, when determining whether there is resonance between the compressor and the door driving mechanism based on the compressor speed and the required speed, the controller is configured to: determine a first frequency corresponding to the compressor speed and a second frequency corresponding to the required speed; obtain a plurality of first harmonic frequencies corresponding to the first frequency and a plurality of second harmonic frequencies corresponding to the second frequency; and determine whether there is resonance between the compressor and the door driving mechanism based on the plurality of first harmonic frequencies and the plurality of second harmonic frequencies.

[0009] The above technical solution has the following beneficial effects: By based on the plurality of first harmonic frequencies and the plurality of second harmonic frequencies, it can accurately determine whether there is resonance in the refrigerator, thus facilitating avoiding resonance by adjusting the speed of the compressor when there is a resonance phenomenon.

[0010] In some embodiments, when determining whether there is resonance between the compressor and the door driving mechanism based on the plurality of first harmonic frequencies and the plurality of second harmonic frequencies, the controller is configured to: if there is at least one target harmonic frequency among the plurality of first harmonic frequencies, determine that there is resonance between the compressor and the door driving mechanism; otherwise, determine that there is no resonance between the compressor and the door driving mechanism, where the target harmonic frequency is a first harmonic frequency whose difference from at least one of the plurality of second harmonic frequencies does not exceed a preset difference threshold.

[0011] The above technical solution has the following beneficial effects: By comparing the difference between the first harmonic frequency and the second harmonic frequency and setting a reasonable difference threshold, it can more accurately determine whether there is a risk of resonance between the compressor and the door driving mechanism, thus facilitating avoiding resonance by adjusting the speed of the compressor when there is a resonance phenomenon.

[0012] In some embodiments, the plurality of first harmonic frequencies include a plurality of different harmonic frequencies obtained by multiplying the first frequency by a plurality of different multiples; and the plurality of second harmonic frequencies include a plurality of different harmonic frequencies obtained by multiplying the second frequency by a plurality of different multiples.

[0013] The above technical solution has the following beneficial effects: By multiplying the fundamental frequency by multiple different multiples, multiple different harmonic frequencies are obtained, which increases the comprehensiveness and accuracy of frequency comparison.

[0014] In some embodiments, the multiple first harmonic frequencies include the first harmonic frequency, second harmonic frequency, and third harmonic frequency of the first frequency; the multiple second harmonic frequencies include the first harmonic frequency, second harmonic frequency, and third harmonic frequency of the second frequency.

[0015] In some embodiments, when adjusting the compressor speed based on the required speed, the controller is configured to: sequentially decrease the compressor speed in accordance with a preset speed step until the target speed first appears, and take the first - appeared target speed as the adjusted compressor speed, where the target speed satisfies the following condition: when the compressor operates at the target speed and the door driving mechanism operates at the required speed, there is no resonance between the compressor and the door driving mechanism.

[0016] The above technical solution has the following beneficial effects: By intelligently adjusting the compressor speed based on the required speed and sequentially decreasing the speed in accordance with a preset speed step to find the target speed that satisfies the resonance - avoidance condition, it can be ensured that there is no resonance between the compressor and the door driving mechanism.

[0017] In some embodiments, before determining whether there is resonance between the compressor and the door driving mechanism based on the compressor speed and the required speed, the controller is further configured to: if the compressor speed exceeds a preset speed threshold, perform a speed - reduction process on the compressor speed until the compressor speed does not exceed the preset speed threshold, and then execute the step of determining whether there is resonance between the compressor and the door driving mechanism based on the compressor speed and the required speed.

[0018] The above technical solution has the following beneficial effects: By performing a speed - reduction process on the compressor speed, it can be avoided that the compressor interferes with the analysis of vibration characteristics in a high - speed state, resulting in misjudgment of resonance, and at the same time, it can avoid the generation of relatively large noise due to the high - speed operation of the compressor.

[0019] In some embodiments, the refrigerator further includes: a gravity sensor disposed on the door for detecting the gravity of the door. When determining the required speed of the door driving mechanism, the controller is configured to: obtain the gravity of the door; and determine the required speed of the door driving mechanism based on the gravity of the door.

[0020] The above technical solution has the following beneficial effects: Based on the gravity sensor, the weight of the door can be monitored in real time, so as to accurately determine the required rotational speed of the door driving mechanism, and facilitate the judgment of whether there is resonance between the compressor and the door driving mechanism based on the required rotational speed of the door driving mechanism and the rotational speed of the compressor.

[0021] In some embodiments, when determining the required rotational speed of the door driving mechanism based on the gravity of the door, the controller is configured to: based on the gravity of the door, match the required rotational speed corresponding to the gravity of the door in the storage unit of the controller, wherein the storage unit stores a pre-calibrated two-dimensional mapping relationship between the gravity of the door and the required rotational speed.

[0022] The above technical solution has the following beneficial effects: Based on the pre-calibrated two-dimensional mapping relationship between the gravity of the door and the required rotational speed, after obtaining the gravity of the door, the required rotational speed of the door driving mechanism can be accurately determined, so as to facilitate the judgment of whether there is resonance between the compressor and the door driving mechanism based on the required rotational speed of the door driving mechanism and the rotational speed of the compressor.

[0023] In some embodiments, when receiving an instruction for triggering the door driving mechanism, the controller is further configured to: if it is determined that the blower is in the starting state, control the blower to stop operating.

[0024] The above technical solution has the following beneficial effects: By controlling the blower to stop rotating, the noise of the refrigerator can be reduced. Further, it is also possible to avoid resonance between the blower operation and the door driving mechanism, generate resonance noise, and at the same time avoid the interference of the blower operation on the resonance result judgment of the compressor and the door driving mechanism, thereby improving the accuracy of the resonance judgment of the compressor and the door driving mechanism.

[0025] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein: Figure 1 is a schematic structural diagram of a refrigerator according to an embodiment of the present invention; Figure 2 is a schematic structural diagram of a refrigerator according to another embodiment of the present invention; Figure 3 is a schematic structural diagram of a refrigeration system according to an embodiment of the present invention; Figure 4 is a schematic diagram of the refrigerant flow direction during refrigeration according to an embodiment of the present invention; Figure 5 is a schematic structural diagram of a controller according to an embodiment of the present invention; Figure 6 is a schematic structural diagram of a refrigerator according to another embodiment of the present invention; Figure 7 is a schematic flow diagram of a control method for a refrigerator according to an embodiment of the present invention; Figure 8 is a schematic flow diagram for determining whether there is resonance between a compressor and a door drive mechanism based on the compressor speed and the required speed according to an embodiment of the present invention. Detailed implementation manners

[0027] 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.

[0028] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 thus should not be construed as a limitation to the present invention.

[0029] The terms "first" and "second" are only used for descriptive purposes, and cannot be construed 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 stated, the meaning of "a plurality" is two or more.

[0030] 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 internal communication of 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.

[0031] In combination with Figure 1 and Figure 6As shown, the refrigerator 10 of this embodiment is approximately rectangular parallelepiped in shape, and includes a cabinet 100 defining a storage space and a plurality of doors 200 provided at the opening of the cabinet 100. Among them, as Figure 2 shown, the door 200 includes a door outer shell 210 located outside the cabinet 100, a door inner liner 220 located inside the cabinet 100, an upper end cover 230, a lower end cover 240, and a heat insulation layer located between the door outer shell 210, the 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 cabinet 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, medicine, etc.

[0032] 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 dryer 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 dryer 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.

[0033] In addition, the refrigerator 10 is provided with a controller 71 to control the operation of various components inside the refrigerator 10, so that the operation of each component of the refrigerator 10 realizes various predetermined functions of the refrigerator 10. Among them, a control device is attached to the refrigerator 10, and the control device has a function of communicating with the controller 71 by using infrared rays or other communication methods, for example. The control device is used for various controls of the refrigerator 10 by the user, realizing the interaction between the user and the refrigerator 10.

[0034] 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.

[0035] The processor 83 can 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 can also be any other device with processing functions, such as a circuit, a device, or a software module. The processor 83 can also include multiple CPUs, and the processor 83 can be a single-CPU processor or a multi-CPU processor. Here, the processor 83 can refer to one or more devices, circuits, or processing cores for processing data (such as computer programs).

[0036] 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.

[0037] 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 capable of implementing communication.

[0038] 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.

[0039] Next, in combination with Figures 6 - 8 describe the refrigerator 10 and its control method according to the embodiments of the present invention.

[0040] In some embodiments, as Figure 6 shown, the refrigerator 10 includes: a cabinet 100.

[0041] In some embodiments, as Figure 6 shown, the refrigerator 10 further includes: a door 200, and the door 200 is provided at the opening of the cabinet 100.

[0042] In some embodiments, as Figure 6 shown, the refrigerator 10 further includes: a refrigeration system 300, which is disposed inside the cabinet 100 and includes a compressor and a blower.

[0043] In some embodiments, as Figure 6 shown, the refrigerator 10 further includes: a door driving mechanism 400, connected to the door 200 and used to drive the door 200 to open or close.

[0044] In some embodiments, as Figure 6 shown, the refrigerator 10 further includes: a rotational speed sensor 500, used to detect the rotational speed of the compressor.

[0045] In some embodiments, as Figure 6 shown, the refrigerator 10 further includes: a controller 71, and the controller 71 is configured to: when receiving an instruction for triggering the door driving mechanism 400, in response to the instruction, determine the required rotational speed of the door driving mechanism 400, and obtain the current operating state of the compressor; if the compressor is currently in an unstarted state, then control the door driving mechanism 400 to operate at the required rotational speed to drive the door 200 to open or close; if the compressor is currently in a started state, then obtain the rotational speed of the compressor; based on the rotational speed of the compressor and the required rotational speed, determine whether there is resonance between the compressor and the door driving mechanism 400; if so, then adjust the rotational speed of the compressor based on the required rotational speed until resonance is avoided, control the compressor to operate at the adjusted rotational speed of the compressor, and control the door driving mechanism 400 to operate at the required rotational speed to drive the door 200 to open or close; if not, then control the compressor to operate at the rotational speed of the compressor, and control the door driving mechanism 400 to operate at the required rotational speed to drive the door 200 to open or close.

[0046] Specifically, when controlling the refrigerator 10, the user can send an instruction through the touch screen interface of the refrigerator 10, the supporting mobile phone APP or other intelligent devices to control the refrigerator 10 to open or close the door 200. At the same time, after the controller 71 receives the instruction to open or close the door 200 of the refrigerator 10, it can, in response to the instruction, analyze the relevant parameters of the door driving mechanism 400, including but not limited to the weight, size, material of the door 200, and the mechanical characteristics of the door driving mechanism 400 (such as motor performance, transmission ratio, etc.) to determine the required rotational speed of the door driving mechanism 400; at the same time, the controller 71 can also obtain the current operating state of the compressor through the sensors arranged inside the refrigerator 10 to determine whether the compressor is currently in a started state.

[0047] Further, after obtaining the current operating state of the compressor, if the compressor is currently in an unstarted state, it indicates that the compressor inside the current refrigerator 10 is in a shutdown state and there is no resonance risk. At this time, the door driving mechanism 400 can be directly controlled to operate at the required speed to drive the door 200 to open or close.

[0048] Further, after obtaining the current operating state of the compressor, if the compressor is currently in a started state, it indicates that the compressor inside the current refrigerator 10 is in a working state. When a user issues an instruction to trigger the door driving mechanism 400, there may be a risk of resonance between the compressor and the door driving mechanism. At this time, the rotational speed of the compressor can be obtained through a rotational speed sensor provided inside the refrigerator 10, and it can be determined whether there is resonance between the compressor and the door driving mechanism 400 based on the rotational speed of the compressor and the required speed, including but not limited to determining whether there is resonance between the compressor and the door driving mechanism 400 based on the operating frequency of the compressor corresponding to the rotational speed of the compressor and the operating frequency of the door driving mechanism 400 corresponding to the required speed.

[0049] Further, when it is determined that there is resonance between the compressor and the door driving mechanism 400, the rotational speed of the compressor can be adjusted based on the required speed, including but not limited to gradually reducing the rotational speed of the compressor to change its vibration frequency, and real-time monitoring the resonance situation until the resonance is avoided, that is, until a rotational speed that does not cause resonance is found, then controlling the compressor to operate at the adjusted rotational speed of the compressor, and controlling the door driving mechanism 400 to operate at the required speed to drive the door 200 to open or close.

[0050] Further, when it is determined that there is no resonance between the compressor and the door driving mechanism 400, it indicates that when the compressor operates at the current rotational speed, there will be no resonance noise with the control door driving mechanism 400. At this time, the compressor can be controlled to operate at the rotational speed of the compressor, and the door driving mechanism 400 can be controlled to operate at the required speed to drive the door 200 to open or close.

[0051] For the refrigerator 10 according to the embodiment of the present invention, when receiving an instruction to trigger the door driving mechanism 400 to drive the door 200 to open or close and the compressor is currently in a started state, it can accurately determine whether there is resonance between the compressor and the door driving mechanism 400 based on the rotational speed of the compressor and the required speed of the door driving mechanism 400. And in the case of resonance, the rotational speed of the compressor is accurately adjusted based on the required speed until the resonance is avoided, then controlling the compressor to operate at the adjusted rotational speed of the compressor, and controlling the door driving mechanism 400 to operate at the required speed, so as to effectively avoid abnormal noise caused by resonance between the compressor and the door driving mechanism 400 when the refrigerator 10 is opened, thereby improving the user experience and satisfaction.

[0052] In one embodiment of the present invention, when determining whether there is resonance between the compressor and the door drive mechanism 400 based on the compressor speed and the required speed, the controller 71 is configured to: determine a first frequency corresponding to the compressor speed and a second frequency corresponding to the required speed; Obtain a plurality of first harmonic frequencies corresponding to the first frequency and a plurality of second harmonic frequencies corresponding to the second frequency; determine whether there is resonance between the compressor and the door drive mechanism 400 based on the plurality of first harmonic frequencies and the plurality of second harmonic frequencies.

[0053] Specifically, under normal circumstances, the speed is expressed in revolutions per minute (rpm), while the frequency is expressed in hertz (Hz). When determining whether there is resonance, it is usually about judging the relationship between frequencies. Therefore, when determining whether there is resonance between the compressor and the door drive mechanism 400 based on the compressor speed and the required speed, the first frequency corresponding to the compressor speed can be determined based on the compressor speed and the second frequency corresponding to the required speed of the door drive mechanism 400 can be determined based on the required speed. For example, since there is a direct relationship between the speed and the frequency, the frequency corresponding to the speed can be determined based on the known speed-frequency relationship, including but not limited to calculating through an empirical formula obtained from experimental data, such as the following formula: , where if represents the speed of the compressor, then represents the first frequency. For example, if the speed of the compressor is 3000 rpm, then the first frequency is 50 Hz. If represents the required speed of the door drive mechanism 400, then represents the second frequency. For example, if the required speed of the door drive mechanism 400 is 2400 rpm, then the second frequency is 40 Hz.

[0054] Furthermore, to ensure the accuracy of the resonance determination result, a plurality of first harmonic frequencies corresponding to the first frequency and a plurality of second harmonic frequencies corresponding to the second frequency can be obtained, and it can be determined whether there is resonance between the compressor and the door drive mechanism 400 based on the plurality of first harmonic frequencies and the plurality of second harmonic frequencies, including but not limited to determining whether there is resonance between the compressor and the door drive mechanism 400 according to the difference between the plurality of first harmonic frequencies and the plurality of second harmonic frequencies.

[0055] In an embodiment of the present invention, when determining whether there is resonance between the compressor and the door drive mechanism 400 based on a plurality of first harmonic frequencies and a plurality of second harmonic frequencies, the controller 71 is configured to: if there is at least one target harmonic frequency among the plurality of first harmonic frequencies, determine that there is resonance between the compressor and the door drive mechanism 400; otherwise, determine that there is no resonance between the compressor and the door drive mechanism 400, where the target harmonic frequency is a first harmonic frequency whose difference from at least one of the plurality of second harmonic frequencies does not exceed a preset difference threshold.

[0056] Specifically, when determining whether there is resonance between the compressor and the door drive mechanism 400 based on a plurality of first harmonic frequencies and a plurality of second harmonic frequencies, the controller 71 can first traverse the plurality of first harmonic frequencies. For each first harmonic frequency, it will be compared with the plurality of second harmonic frequencies, and based on the comparison result, it is determined whether there is resonance between the compressor and the door drive mechanism 400. For example, if the difference between at least one first harmonic frequency and at least one second harmonic frequency does not exceed the preset difference threshold, it indicates that the current first harmonic frequency is the target harmonic frequency. At this time, it can be determined that there is resonance between the compressor and the door drive mechanism 400; if the differences between the plurality of first harmonic frequencies and the plurality of second harmonic frequencies all exceed the preset difference threshold, it can be determined that there is no resonance between the compressor and the door drive mechanism 400.

[0057] In a specific embodiment, the preset difference threshold can be set according to experimental data.

[0058] In an embodiment of the present invention, the plurality of first harmonic frequencies include a plurality of different harmonic frequencies obtained by multiplying a first frequency by a plurality of different multiples; the plurality of second harmonic frequencies include a plurality of different harmonic frequencies obtained by multiplying a second frequency by a plurality of different multiples.

[0059] Specifically, the first frequency is the frequency corresponding to the rotational speed of the compressor. By multiplying the first frequency by different multiples (usually integers), a plurality of first harmonic frequencies can be obtained. For example, if the first frequency is , then the plurality of first harmonic frequencies can be N× , where N = 1, 2, 3,.... Similarly, the second frequency is the frequency corresponding to the required rotational speed of the door drive mechanism 400. By multiplying the second frequency by different multiples (usually integers), a plurality of second harmonic frequencies can be obtained. For example, if the first frequency is , then the plurality of first harmonic frequencies can be N× , where N = 1, 2, 3,....

[0060] In one embodiment of the present invention, the multiple first harmonic frequencies include the fundamental harmonic frequency, the second harmonic frequency, and the third harmonic frequency of the first frequency; the multiple second harmonic frequencies include the fundamental harmonic frequency, the second harmonic frequency, and the third harmonic frequency of the second frequency.

[0061] Specifically, when the refrigerator 10 is opened, the low-frequency vibration is relatively large, making it easier to identify resonance. Therefore, to ensure the accuracy of the resonance judgment result, when determining the multiple first harmonic frequencies, the fundamental harmonic frequency, the second harmonic frequency, and the third harmonic frequency of the first frequency can be selected, that is, the first frequency itself, the double value of the first frequency, and the triple value of the first frequency are selected as the multiple first harmonic frequencies; similarly, when determining the multiple second harmonic frequencies, the fundamental harmonic frequency, the second harmonic frequency, and the third harmonic frequency of the second frequency are selected, that is, the second frequency itself, the double value of the second frequency, and the triple value of the second frequency are selected as the multiple second harmonic frequencies.

[0062] In one embodiment of the present invention, when adjusting the compressor speed based on the required speed, the controller 71 is configured to: sequentially decrease the compressor speed according to a preset speed step until the target speed first appears, and then use the first-appearing target speed as the adjusted compressor speed, where the target speed satisfies the following condition: when the compressor operates at the target speed and the door drive mechanism 400 operates at the required speed, there is no resonance between the compressor and the door drive mechanism 400.

[0063] Specifically, when adjusting the compressor speed based on the required speed, the speed of the compressor can be controlled to decrease sequentially according to a preset speed step, and resonance judgment is performed after each decrease until the speed that can avoid resonance between the compressor and the door drive mechanism 400, that is, the target speed, first appears. Then, the first-appearing target speed is used as the adjusted compressor speed, and the compressor is controlled to operate at the target speed.

[0064] In one embodiment of the present invention, before determining whether there is resonance between the compressor and the door drive mechanism 400 based on the compressor speed and the required speed, the controller 71 is further configured to: if the compressor speed exceeds a preset speed threshold, perform a speed reduction process on the compressor speed until the compressor speed does not exceed the preset speed threshold, and then execute the step of determining whether there is resonance between the compressor and the door drive mechanism 400 based on the compressor speed and the required speed.

[0065] Specifically, before determining whether there is resonance between the compressor and the door drive mechanism 400 based on the compressor speed and the required speed, the current speed of the compressor can be monitored in real time through a speed sensor. If the compressor speed exceeds the preset speed threshold, it indicates that the compressor is currently in a high-speed state. In this state, not only will it interfere with the analysis of vibration characteristics, resulting in misjudgment of resonance, but also it will generate relatively large noise due to the high-speed operation of the compressor, bringing a poor user experience. Therefore, the speed of the compressor can be reduced until the compressor speed does not exceed the preset speed threshold, and then the step of determining whether there is resonance between the compressor and the door drive mechanism 400 based on the compressor speed and the required speed is executed, that is, when the compressor speed is controlled to decrease to the preset speed threshold, the step of determining whether there is resonance between the compressor and the door drive mechanism 400 based on the compressor speed and the required speed can be started.

[0066] In summary, in a specific embodiment, it is assumed that the preset speed threshold can be set according to experimental data or actual conditions. For example, the preset speed threshold can be 3000 rpm. If the compressor speed exceeds the preset speed threshold (for example, 3200 rpm), then the compressor speed is controlled to decrease to 3000 rpm. At this time, the first frequency corresponding to the compressor speed can be 50 Hz, and multiple first harmonic frequencies are 50 Hz, 100 Hz, 150 Hz. Further, if the required speed of the door drive mechanism 400 is 2400 rpm, the second frequency can be 40 Hz, and multiple second harmonic frequencies are 40 Hz, 80 Hz, 130 Hz. Further, if the preset difference threshold is 3 Hz, then the first harmonic frequencies (50 Hz, 100 Hz, 150 Hz) can be compared with the second harmonic frequencies (40 Hz, 80 Hz, 120 Hz) one by one to determine whether the difference between any two frequencies is less than 3 Hz. Specifically as follows: The differences between 50 Hz, 100 Hz, 150 Hz and 40 Hz are 10 Hz, 60 Hz, 110 Hz respectively, all greater than 3 Hz; The differences between 50 Hz, 100 Hz, 150 Hz and 80 Hz are 30 Hz, 20 Hz, 70 Hz respectively, all greater than 3 Hz; The differences between 50 Hz, 100 Hz, 150 Hz and 120 Hz are 70 Hz, 20 Hz, 30 Hz respectively, all greater than 3 Hz. It can be seen that when the compressor is running at the current speed, the differences between multiple first harmonic frequencies and multiple second harmonic frequencies are all greater than the preset difference threshold, that is, there is no resonance between the compressor and the door drive mechanism 400 at this time. The compressor can be controlled to run at the current speed, and the door drive mechanism 400 can be controlled to run at the required speed to drive the door 200 to open or close.

[0067] In one embodiment of the present invention, the refrigerator 10 further includes: a gravity sensor disposed on the door 200 for detecting the gravity of the door 200. When determining the required rotational speed of the door drive mechanism 400, the controller 71 is configured to: obtain the gravity of the door 200; Determine the required rotational speed of the door drive mechanism 400 based on the gravity of the door 200.

[0068] Specifically, a gravity sensor is further disposed on the door 200 of the refrigerator 10, including but not limited to being embedded inside the door 200 for detecting the gravity of the door 200. For example, the controller 71 can be connected to the gravity sensor to obtain the electrical signal output by the gravity sensor in real time and convert it into the gravity value of the door 200. It can be understood that the gravity value of the door 200 can change according to the actual usage of the user and the different items stored.

[0069] Furthermore, after obtaining the gravity of the door 200, the gravity value of the door 200 can be used to determine the required rotational speed of the door drive mechanism 400 in combination with a preset algorithm or mapping relationship.

[0070] In one embodiment of the present invention, when determining the required rotational speed of the door drive mechanism 400 based on the gravity of the door 200, the controller 71 is configured to: match, in the storage unit in the controller 71, the required rotational speed corresponding to the gravity of the door 200, wherein the storage unit stores a pre-calibrated two-dimensional mapping relationship between the gravity of the door 200 and the required rotational speed.

[0071] Specifically, after obtaining the gravity of the door 200, the pre-calibrated two-dimensional mapping relationship between the gravity of the door 200 and the required rotational speed in the storage unit of the controller 71 can be traversed (i.e., checked row by row or record by record) until the required rotational speed corresponding to the gravity of the door 200 is found. It can be understood that the two-dimensional mapping relationship between the gravity of the door 200 and the required rotational speed includes multiple groups of corresponding relationships between the gravity - required rotational speed of the door 200, that is, each row or each record in the two-dimensional mapping relationship between the gravity of the door 200 and the required rotational speed represents a specific combination of the gravity of the door 200 and the required rotational speed.

[0072] In a specific embodiment, the two-dimensional mapping relationship between the gravity of the door 200 and the required rotational speed can be obtained through experimental measurement, simulation calculation or empirical formula. For example, the gravity of the door 200 can be denoted as H. When H > 40 Kg, the required rotational speed is R1; when 30 Kg < H < 40 Kg, the required rotational speed is R2; when 20 Kg < H < 30 Kg, the required rotational speed is R3.

[0073] In an embodiment of the present invention, when receiving an instruction for triggering the door driving mechanism 400, the controller 71 is further configured to: if it is determined that the blower is in a starting state, control the blower to stop operating.

[0074] Specifically, when receiving an instruction for triggering the door driving mechanism 400, if it is determined that the blower is currently in a starting state, at this time, to avoid greater noise caused by the simultaneous operation of the compressor and the blower, the blower can be controlled to stop operating to reduce the noise level of the refrigerator 10. Further, controlling the blower to stop rotating at this time can also avoid resonance between the blower operation and the door driving mechanism 400, thereby generating resonance noise, and at the same time avoid interference of the blower operation on the resonance result judgment of the compressor and the door driving mechanism 400, thereby improving the accuracy of the resonance judgment of the compressor and the door driving mechanism 400.

[0075] For the refrigerator 10 according to the embodiment of the present invention, when receiving an instruction for triggering the door driving mechanism 400 to drive the door 200 to open or close and the compressor is currently in a starting state, it is possible to accurately judge whether there is resonance between the compressor and the door driving mechanism 400 based on the compressor speed and the required speed of the door driving mechanism 400, and in the case of resonance, accurately adjust the compressor speed based on the required speed until resonance is avoided, then control the compressor to operate at the adjusted compressor speed, and control the door driving mechanism 400 to operate at the required speed, thereby effectively avoiding abnormal noise caused by resonance between the compressor and the door driving mechanism 400 when the refrigerator 10 is opened, and further improving the user experience and satisfaction. Further, after the compressor is started, by controlling the blower to stop rotating, the noise of the refrigerator 10 can be further reduced, and at the same time, resonance between the blower operation and the door driving mechanism 400 can be avoided, generating resonance noise, and interference of the blower operation on the resonance result judgment of the compressor and the door driving mechanism 400 can be avoided, thereby improving the accuracy of the resonance judgment of the compressor and the door driving mechanism 400.

[0076] Next, reference is made to Figure 7 Describe the control method of the refrigerator according to the embodiment of the present invention.

[0077] As Figure 7 shown, the control method of the refrigerator according to the embodiment of the present invention at least includes step S1-step S3.

[0078] Step S1, when receiving an instruction for triggering the door driving mechanism, in response to the instruction, determine the required speed of the door driving mechanism, and obtain the current operating state of the compressor.

[0079] Step S2, if the compressor is currently in an unstarted state, control the door driving mechanism to operate at the required speed to drive the door to open or close.

[0080] Step S3, if the compressor is currently in the starting state, obtain the compressor speed.

[0081] Step S4, based on the compressor speed and the required speed, determine whether there is resonance between the compressor and the door driving mechanism.

[0082] Step S5, if there is resonance, adjust the compressor speed based on the required speed until the resonance is avoided. Then, control the compressor to operate at the adjusted compressor speed, and control the door driving mechanism to operate at the required speed to drive the door to open or close. If not, control the compressor to operate at the compressor speed, and control the door driving mechanism to operate at the required speed to drive the door to open or close.

[0083] In some embodiments, as shown in Figure 8 , to determine whether there is resonance between the compressor and the door driving mechanism based on the compressor speed and the required speed, specifically includes: determining a first frequency corresponding to the compressor speed and a second frequency corresponding to the required speed; obtaining a plurality of first harmonic frequencies corresponding to the first frequency and a plurality of second harmonic frequencies corresponding to the second frequency; and determining whether there is resonance between the compressor and the door driving mechanism based on the plurality of first harmonic frequencies and the plurality of second harmonic frequencies.

[0084] In some embodiments, as shown in Figure 8 , to determine whether there is resonance between the compressor and the door driving mechanism based on the plurality of first harmonic frequencies and the plurality of second harmonic frequencies, specifically includes: if there is at least one target harmonic frequency among the plurality of first harmonic frequencies, determine that there is resonance between the compressor and the door driving mechanism; otherwise, determine that there is no resonance between the compressor and the door driving mechanism, where the target harmonic frequency is a first harmonic frequency whose difference from at least one of the plurality of second harmonic frequencies does not exceed a preset difference threshold.

[0085] In some embodiments, the plurality of first harmonic frequencies include a plurality of different harmonic frequencies obtained by multiplying the first frequency by a plurality of different multiples; the plurality of second harmonic frequencies include a plurality of different harmonic frequencies obtained by multiplying the second frequency by a plurality of different multiples.

[0086] In some embodiments, the plurality of first harmonic frequencies include the first harmonic frequency, second harmonic frequency, and third harmonic frequency of the first frequency; the plurality of second harmonic frequencies include the first harmonic frequency, second harmonic frequency, and third harmonic frequency of the second frequency.

[0087] In some embodiments, the compressor speed is adjusted based on the required speed, which specifically includes: sequentially reducing the compressor speed in accordance with a preset speed step until the target speed first appears, and taking the first-appearing target speed as the adjusted compressor speed, where the target speed satisfies the following condition: at the target speed and the required speed, there is no resonance between the compressor and the door drive mechanism.

[0088] In some embodiments, before determining whether there is resonance between the compressor and the door drive mechanism based on the compressor speed and the required speed, it further includes: if the compressor speed exceeds the preset speed threshold, the compressor speed is reduced until the compressor speed does not exceed the preset speed threshold, and then the step of determining whether there is resonance between the compressor and the door drive mechanism based on the compressor speed and the required speed is executed.

[0089] In some embodiments, the refrigerator further includes: a gravity sensor disposed on the door for detecting the gravity of the door. When determining the required speed of the door drive mechanism, it specifically includes: obtaining the gravity of the door; determining the required speed of the door drive mechanism based on the gravity of the door.

[0090] In some embodiments, determining the required speed of the door drive mechanism based on the gravity of the door specifically includes: based on the gravity of the door, matching in the storage unit of the controller the required speed corresponding to the gravity of the door, where the storage unit stores a pre-calibrated two-dimensional mapping relationship between the gravity of the door and the required speed.

[0091] In some embodiments, when receiving an instruction for triggering the door drive mechanism, it further includes: if it is determined that the blower is in the starting state, controlling the blower to stop running.

[0092] According to the control method of the refrigerator in the embodiments of the present invention, when receiving an instruction for triggering the door drive mechanism to drive the door to open or close and the compressor is currently in the starting state, it is possible to accurately determine whether there is resonance between the compressor and the door drive mechanism based on the compressor speed and the required speed of the door drive mechanism. In the case of resonance, the compressor speed is accurately adjusted based on the required speed until the resonance is avoided, then controlling the compressor to operate at the adjusted compressor speed and controlling the door drive mechanism to operate at the required speed, thereby effectively avoiding abnormal noise caused by resonance between the compressor and the door drive mechanism when the refrigerator door is opened, and further improving the user experience and satisfaction. Further, after the compressor starts, by controlling the blower to stop rotating, the refrigerator noise can be further reduced, and at the same time, resonance between the blower operation and the door drive mechanism can be avoided, resonance noise can be generated, and interference of the blower operation on the resonance result judgment of the compressor and the door drive mechanism can be avoided, thereby improving the accuracy of the resonance judgment of the compressor and the door drive mechanism.

[0093] In the description of this specification, the description referring 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 representations of the above terms do not necessarily refer to the same embodiment or example.

[0094] 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 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, Comprising: A box body; A box door provided at an opening of the refrigerator box body; A refrigeration system provided inside the refrigerator box body, including a compressor and a blower; A box door driving mechanism connected to the box door for driving the box door to open or close; A rotational speed sensor for detecting the rotational speed of the compressor; A controller configured as follows: When receiving an instruction for triggering the box door driving mechanism, in response to the instruction, determine the required rotational speed of the box door driving mechanism and obtain the current operating state of the compressor; If the compressor is currently in an unstarted state, control the box door driving mechanism to operate at the required rotational speed to drive the box door to open or close; If the compressor is currently in a started state, obtain the rotational speed of the compressor; Based on the rotational speed of the compressor and the required rotational speed, determine whether there is resonance between the compressor and the box door driving mechanism; If so, adjust the rotational speed of the compressor based on the required rotational speed until resonance is avoided, then control the compressor to operate at the adjusted rotational speed of the compressor and control the box door driving mechanism to operate at the required rotational speed to drive the box door to open or close; if not, control the compressor to operate at the rotational speed of the compressor and control the box door driving mechanism to operate at the required rotational speed to drive the box door to open or close.

2. The refrigerator according to claim 1, characterized in that, When determining whether there is resonance between the compressor and the box door driving mechanism based on the rotational speed of the compressor and the required rotational speed, the controller is configured as follows: Determine a first frequency corresponding to the rotational speed of the compressor and a second frequency corresponding to the required rotational speed; Obtain a plurality of first harmonic frequencies corresponding to the first frequency and a plurality of second harmonic frequencies corresponding to the second frequency; Based on the plurality of first harmonic frequencies and the plurality of second harmonic frequencies, determine whether there is resonance between the compressor and the box door driving mechanism.

3. The refrigerator according to claim 2, wherein When determining whether there is resonance between the compressor and the box door driving mechanism based on the plurality of first harmonic frequencies and the plurality of second harmonic frequencies, the controller is configured as follows: If there is at least one target harmonic frequency among the plurality of first harmonic frequencies, determine that there is resonance between the compressor and the box door driving mechanism; otherwise, determine that there is no resonance between the compressor and the box door driving mechanism, where the target harmonic frequency is a first harmonic frequency whose difference from at least one of the plurality of second harmonic frequencies does not exceed a preset difference threshold.

4. The refrigerator according to claim 2, characterized in that, The plurality of first harmonic frequencies include a plurality of different harmonic frequencies obtained by multiplying the first frequency by a plurality of different multiples; The plurality of second harmonic frequencies include a plurality of different harmonic frequencies obtained by multiplying the second frequency by a plurality of different multiples.

5. The refrigerator according to claim 4, characterized in that The plurality of first harmonic frequencies include the first harmonic frequency, second harmonic frequency, and third harmonic frequency of the first frequency; The plurality of second harmonic frequencies include the first harmonic frequency, second harmonic frequency, and third harmonic frequency of the second frequency.

6. The refrigerator according to claim 1, characterized in that, When adjusting the rotational speed of the compressor based on the required rotational speed, the controller is configured as follows: Reduce the rotational speed of the compressor step by step according to a preset rotational speed step until the target rotational speed first appears, and use the first-appearing target rotational speed as the adjusted rotational speed of the compressor, where the target rotational speed satisfies the following condition: at the target rotational speed and the required rotational speed, there is no resonance between the compressor and the door drive mechanism.

7. The refrigerator according to claim 1, characterized in that, Before determining whether there is resonance between the compressor and the door drive mechanism based on the rotational speed of the compressor and the required rotational speed, the controller is further configured to: If the rotational speed of the compressor exceeds a preset rotational speed threshold, perform a rotational speed reduction process on the rotational speed of the compressor until the rotational speed of the compressor does not exceed the preset rotational speed threshold, and then execute the step of determining whether there is resonance between the compressor and the door drive mechanism based on the rotational speed of the compressor and the required rotational speed.

8. The refrigerator according to claim 1, wherein, The refrigerator further includes: a gravity sensor disposed on the door for detecting the gravity of the door. When determining the required rotational speed of the door drive mechanism, the controller is configured to: Obtain the gravity of the door; Determine the required rotational speed of the door drive mechanism based on the gravity of the door.

9. The refrigerator according to claim 8, wherein, When determining the required rotational speed of the door drive mechanism based on the gravity of the door, the controller is configured to: Based on the gravity of the door, match the required rotational speed corresponding to the gravity of the door in the storage unit in the controller, where the storage unit stores a pre-calibrated two-dimensional mapping relationship between the gravity of the door and the required rotational speed.

10. The refrigerator according to claim 1, characterized in that, When receiving an instruction for triggering the door drive mechanism, the controller is further configured to: If it is determined that the blower is in the starting state, control the blower to stop operating.

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