Refrigerator air door feedback electric control device and method

Abstract

The invention provides a refrigerator air door feedback electric control device and method. The device comprises an MCU module, a temperature detection module, a drive circuit module and an air door feedback module. The temperature detection module, the driving circuit module and the air door feedback module are electrically connected with the MCU module; the MCU module detects the temperature of a refrigerator chamber through the temperature detection module; an air door control instruction is generated according to the temperature of the refrigerator chamber, so that the opening degree of an air door is adjusted through a driving circuit module; actual air door position voltage is obtained in real time through an air door feedback module; according to the actual air door position voltage and the target position voltage, whether the actual air door position is abnormal or not is judged; if the actual air door position is abnormal, an air door initialization program is executed through a driving circuit module; if the actual air door position is normal, the actual air door position voltage continues to be obtained in real time through the air door feedback module, and the problem that the running reliability of a refrigerating system is reduced when the refrigerator air door breaks down is solved.

Description

Technical Field

[0001] The present application relates to the technical field of refrigerators, and particularly to a refrigerator air damper with feedback electronic control device and method. Background Art

[0002] In a refrigerator refrigeration system, the precise control of the air damper is directly related to the stability of the temperature adjustment of each compartment. Since there are differences in temperature requirements for different storage areas, it is necessary to dynamically adjust the air damper opening in real time according to the compartment temperature to match the refrigeration output. In this process, the action feedback and status monitoring of the air damper actuator become key factors to ensure the reliable operation of the refrigeration system. Especially when dealing with abnormal working conditions such as mechanical jamming and icing, it is urgent to establish a closed-loop control mechanism that can verify the in-place state of the air damper.

[0003] In the related art, the refrigerator air damper control system drives the opening and closing of the air damper through a stepping motor, and its control logic realizes the opening adjustment based on the preset number of steps. Specifically, when implemented, the controller sends a pulse signal to the motor driver to control the number of rotation steps, thereby driving the air damper blade to rotate to the target angle. This solution relies on the mechanical transmission accuracy, does not integrate an air damper position detection element, and only indirectly estimates the air damper position state through pulse counting.

[0004] Since the above solution lacks a physical position feedback mechanism, it is impossible to verify the actual in-place situation of the air damper. When the motor loses steps, the transmission mechanism jams, or the air damper blade freezes, the controller still misjudges it as a normal execution state, resulting in abnormal compartment temperature. In addition, the system cannot distinguish between mechanical failures and transient jams, neither can it trigger self-repair actions nor provide fault location information to the user, and it relies on manual troubleshooting, significantly reducing the operation reliability of the refrigeration system. Summary of the Invention

[0005] The present application provides a refrigerator air damper with feedback electronic control device and method to solve the problem that the failure of the refrigerator air damper reduces the operation reliability of the refrigeration system.

[0006] The first aspect of the present application provides a refrigerator air damper with feedback electronic control device, including: an MCU module, a temperature detection module, a drive circuit module, and an air damper feedback module;

[0007] The temperature detection module, the drive circuit module, and the air damper feedback module are all electrically connected to the MCU module; the MCU module is configured to:

[0008] Detect the temperature of the refrigerator compartment through the temperature detection module;

[0009] Generate an air damper control instruction according to the temperature of the refrigerator compartment to adjust the air damper opening through the drive circuit module;

[0010] Obtain the actual air damper position voltage in real time through the air damper feedback module;

[0011] Judge whether the actual damper position is abnormal according to the actual damper position voltage and the target position voltage;

[0012] If the actual damper position is abnormal, execute the damper initialization program through the drive circuit module;

[0013] If the actual damper position is normal, continue to obtain the actual damper position voltage in real time through the damper feedback module.

[0014] The refrigerator damper with feedback electronic control device monitors the temperature of the refrigerator compartment in real time through the temperature detection module. The MCU module generates a damper control instruction according to the temperature data and adjusts the damper opening through the drive circuit module. At the same time, the actual damper position voltage is obtained by using the damper feedback module, and the damper position state is judged by comparing with the target position voltage. When it is abnormal, the initialization program is executed to automatically repair the damper abnormality, thereby improving the damper control accuracy, reducing the temperature fluctuation, enhancing the operation stability of the refrigerator, and solving the problem that the failure of the refrigerator damper reduces the operation reliability of the refrigeration system.

[0015] Optionally, the temperature detection module includes: a compartment temperature sensor, a first voltage dividing resistor, a first filter capacitor, and a first current limiting resistor;

[0016] One end of the compartment temperature sensor is connected to the power supply and the power supply pin of the MCU module, the other end of the compartment temperature sensor is connected to one end of the first voltage dividing resistor, and the other end of the first voltage dividing resistor is grounded;

[0017] The first filter capacitor is connected in parallel with the first voltage dividing resistor; one end of the first current limiting resistor is connected between the compartment temperature sensor and the first voltage dividing resistor, and the other end of the first current limiting resistor is connected to the first analog acquisition port of the MCU module.

[0018] The temperature detection module forms a voltage dividing circuit through the compartment temperature sensor and the first voltage dividing resistor, filters the signal in combination with the first filter capacitor, and transmits the signal to the first analog acquisition port of the MCU module through the first current limiting resistor, thereby reducing the noise interference of the temperature detection signal, improving the accuracy of temperature acquisition, and enhancing the stability of the refrigerator compartment temperature monitoring.

[0019] Optionally, the drive circuit module includes: an enable pin, a first input port, a second input port, a first output port, a second output port, a third output port, and a fourth output port;

[0020] The enable pin is connected to the first pulse output terminal of the MCU module; the first input port is connected to the second pulse output terminal of the MCU module; the second input port is connected to the third pulse output terminal of the MCU module;

[0021] The first output port is connected to the positive terminal of the first-phase coil of the stepper motor for driving the air damper, and the second output port is connected to the negative terminal of the first-phase coil; the third output port is connected to the positive terminal of the second-phase coil of the stepper motor for driving the air damper, and the fourth output port is connected to the negative terminal of the second-phase coil.

[0022] The drive circuit module receives the pulse control signal of the MCU module through the enable pin and the input port, and is connected to the two-phase coils of the stepper motor via the output port, thereby achieving precise drive of the air damper stepper motor, improving the response speed of the air damper opening adjustment, reducing the control delay, and enhancing the stability of the air damper position control.

[0023] Optionally, the refrigerator air damper with feedback electronic control device further includes a heating module;

[0024] The heating module is electrically connected to the MCU module; the MCU module is configured to:

[0025] After executing the air damper initialization program through the drive circuit module, continuously obtain the actual air damper position voltage in real time through the air damper feedback module;

[0026] Judge whether the actual air damper position is abnormal again according to the actual air damper position voltage and the target position voltage;

[0027] If the actual air damper position is abnormal again, execute the fault self-repair program through the heating module.

[0028] By adding a heating module, when the position is still detected as abnormal after the air damper initialization program, the refrigerator air damper with feedback electronic control device starts the fault self-repair program, which helps to alleviate the jamming problem of the air damper caused by frosting or icing, and improves the operation reliability of the air damper in a low-temperature environment.

[0029] Optionally, the heating module includes: a heating resistor, a first switch, a second switch, a second current-limiting resistor, a third current-limiting resistor, and a second filter capacitor;

[0030] One end of the heating resistor is connected to the source electrode of the second switch, and the other end of the heating resistor is grounded; the drain electrode of the second switch is connected to the voltage source, the gate electrode of the second switch is connected to the collector electrode of the first switch through the third current-limiting resistor, and the collector electrode of the first switch is connected to the drain electrode of the second switch through the second current-limiting resistor; the emitter electrode of the first switch is grounded, and the base electrode of the first switch is connected to the fourth pulse output terminal of the MCU module;

[0031] One end of the second filter capacitor is grounded, and the other end of the second filter capacitor is connected to the source electrode of the second switch.

[0032] The heating module realizes the controlled on / off of the heating resistor through the cascaded control of the first switch and the second switch, in cooperation with the current-limiting resistor and the filter capacitor, which helps reduce circuit interference, improve the stability of heating control, and at the same time alleviate the abnormal operation problem of the air damper mechanism caused by the low-temperature environment, and improve the reliability of fault self-repair.

[0033] Optionally, the refrigerator air damper with feedback electronic control device further includes a display module;

[0034] The display module is electrically connected to the MCU module; the MCU module is configured as:

[0035] After executing the fault self-repair program through the heating module, continuously obtain the actual air damper position voltage in real time through the air damper feedback module;

[0036] Judge whether the actual air damper position is still abnormal according to the actual air damper position voltage and the target position voltage;

[0037] If the actual air damper position is still abnormal, generate an air damper fault information signal;

[0038] Transmit the air damper fault information signal to the display module to display the air damper fault information.

[0039] The refrigerator air damper with feedback electronic control device generates and displays fault information when the air damper position is still detected to be abnormal after the fault self-repair program through the coordinated work of the display module and the MCU module, which helps users timely understand the operation status of the air damper, improve the convenience of equipment maintenance, and reduce the duration of abnormal operation of the refrigerator caused by air damper faults.

[0040] Optionally, the air damper feedback module includes: a telescopic impedance, a third filter capacitor, a second voltage-dividing resistor, and a fourth current-limiting resistor;

[0041] The telescopic impedance is arranged on the rotating shaft of the air damper. One end of the fourth current-limiting resistor is connected to the second analog quantity acquisition port of the MCU module, the other end of the fourth current-limiting resistor is connected to the telescopic impedance and one end of the second voltage-dividing resistor, and the other end of the second voltage-dividing resistor is grounded; the other end of the telescopic impedance is connected to the power supply; the third filter capacitor is connected in parallel with the second voltage-dividing resistor.

[0042] The air damper feedback module forms a voltage-dividing circuit through the telescopic impedance and the second voltage-dividing resistor, and with the filtering effect of the third filter capacitor and the signal transmission of the fourth current-limiting resistor, can reduce the interference of the air damper position detection signal, improve the accuracy of air damper position feedback, and improve the accuracy of air damper opening control.

[0043] Optionally, the retractable resistor is a retractable spring - type linear resistor, and the resistance value of the retractable spring - type linear resistor changes linearly with the opening degree of the air damper.

[0044] The air damper feedback module uses a retractable spring - type linear resistor as a detection element. Its resistance value changes linearly with the opening degree of the air damper, and it can convert the mechanical displacement into a linear electrical signal, thereby improving the linearity of the air damper position detection, reducing the signal conversion error, and enhancing the accuracy and stability of the air damper opening control.

[0045] The second aspect of this application provides a method for electronically controlling a refrigerator air damper with feedback, which is applied to the refrigerator air damper electronically controlled device described in the first aspect. The method includes:

[0046] Detect the temperature of the refrigerator compartment through the temperature detection module;

[0047] Generate an air damper control command according to the temperature of the refrigerator compartment to adjust the opening degree of the air damper through the drive circuit module;

[0048] Obtain the actual air damper position voltage in real - time through the air damper feedback module;

[0049] Judge whether the actual air damper position is abnormal according to the actual air damper position voltage and the target position voltage;

[0050] If the actual air damper position is abnormal, execute the air damper initialization program through the drive circuit module;

[0051] If the actual air damper position is normal, continue to obtain the actual air damper position voltage in real - time through the air damper feedback module.

[0052] The method monitors the temperature of the refrigerator compartment in real - time through the temperature detection module. The MCU module generates an air damper control command according to the temperature data and adjusts the opening degree of the air damper through the drive circuit module. At the same time, it uses the air damper feedback module to obtain the actual air damper position voltage, judges the air damper position state by comparing it with the target position voltage, and executes the initialization program when it is abnormal, thereby improving the air damper control accuracy, reducing the temperature fluctuation, enhancing the operation stability of the refrigerator, and solving the problem that the failure of the refrigerator air damper reduces the operation reliability of the refrigeration system.

[0053] Optionally, after executing the air damper initialization program through the drive circuit module, the method further includes:

[0054] Continue to obtain the actual air damper position voltage in real - time through the air damper feedback module;

[0055] Judge whether the actual air damper position is abnormal again according to the actual air damper position voltage and the target position voltage;

[0056] If the actual air damper position is abnormal again, execute the fault self - repair program through the heating module;

[0057] Continuously obtain the actual damper position voltage in real time through the damper feedback module;

[0058] Judge whether the actual damper position is still abnormal according to the actual damper position voltage and the target position voltage;

[0059] If the actual damper position is still abnormal, generate a damper fault information signal;

[0060] Transmit the damper fault information signal to the display module to display the damper fault information.

[0061] After the damper initialization program is executed, the method continuously monitors the damper position status. When it detects an abnormality again, it starts the heating module for fault self-repair, and when the abnormality persists, it outputs fault information through the display module, thus forming a multi-level fault handling mechanism, which helps to alleviate the damper jamming problem, improve the system's self-repair ability, reduce the difficulty of fault troubleshooting, and enhance the convenience of equipment maintenance.

[0062] As can be seen from the above technical solutions, the present application provides a refrigerator damper with feedback electric control device and method. The device includes: an MCU module, a temperature detection module, a drive circuit module, and a damper feedback module; the temperature detection module, the drive circuit module, and the damper feedback module are all electrically connected to the MCU module; the MCU module detects the temperature of the refrigerator compartment through the temperature detection module; generates a damper control instruction according to the temperature of the refrigerator compartment to adjust the damper opening through the drive circuit module; obtains the actual damper position voltage in real time through the damper feedback module; judges whether the actual damper position is abnormal according to the actual damper position voltage and the target position voltage; if the actual damper position is abnormal, execute the damper initialization program through the drive circuit module; if the actual damper position is normal, continue to obtain the actual damper position voltage in real time through the damper feedback module, so as to solve the problem that the failure of the refrigerator damper reduces the operation reliability of the refrigeration system. Description of the Drawings

[0063] In order to more clearly illustrate the technical solutions of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0064] Figure 1 It is the circuit topology diagram of the refrigerator damper with feedback electric control device described in the embodiment of the present application;

[0065] Figure 2 It is the flow schematic diagram of the refrigerator damper with feedback electric control method described in the embodiment of the present application. Detailed Embodiments

[0066] Embodiments will be described in detail below, and examples thereof are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following examples do not represent all embodiments consistent with the present application. They are merely examples of systems and methods consistent with some aspects of the present application.

[0067] It should be noted that the brief description of the terms in this application is only for the convenience of understanding the embodiments described next, rather than intending to limit the embodiments of the present application. Unless otherwise specified, these terms should be understood in their ordinary and common meanings.

[0068] The terms "first", "second", "third", etc. in the specification, claims and above-mentioned drawings of this application are used to distinguish similar or homogeneous objects or entities, and do not necessarily mean to limit a specific order or sequence, unless otherwise noted. It should be understood that such terms can be interchanged under appropriate circumstances.

[0069] The terms "comprising" and "having" and any variations thereof are intended to cover but not exclusively include. For example, a product or device comprising a series of components does not necessarily have to be limited to all the components clearly listed, but may include other components not clearly listed or inherent to these products or devices.

[0070] In a refrigerator refrigeration system, the precise control of the air damper is directly related to the stability of the temperature regulation in each compartment. Since there are differences in temperature requirements for different storage areas, it is necessary to dynamically adjust the air damper opening in real time according to the compartment temperature to match the refrigeration output. In this process, the action feedback and status monitoring of the air damper actuator become key factors to ensure the reliable operation of the refrigeration system. Especially when dealing with abnormal working conditions such as mechanical jamming and icing, it is urgent to establish a closed-loop control mechanism that can verify the in-place state of the air damper.

[0071] In related embodiments, the refrigerator air damper control system drives the air damper to open and close through a stepper motor, and its control logic realizes the opening adjustment based on a preset number of steps. Specifically, during implementation, the controller sends a pulse signal to the motor driver to control the number of rotation steps, thereby driving the air damper blade to rotate to the target angle. This solution relies on the mechanical transmission accuracy and does not integrate an air damper position detection element. It only indirectly infers the air damper position state through pulse counting. However, due to the lack of a physical position feedback mechanism, this solution cannot verify the actual in-place situation of the air damper. When the motor loses steps, the transmission mechanism jams, or the air damper blade freezes, the controller still misjudges it as a normal execution state, resulting in abnormal compartment temperature. In addition, the system cannot distinguish between mechanical failures and transient jams, neither can it trigger self-repair actions nor provide fault location information to the user, and it relies on manual troubleshooting, significantly reducing the operating reliability of the refrigeration system.

[0072] To solve the problem that the failure of the refrigerator air damper reduces the operating reliability of the refrigeration system, refer to Figure 1 - Figure 2 In some embodiments of the present application, a refrigerator air damper with feedback electronic control device is provided, including: an MCU module U1, a temperature detection module, a drive circuit module U2, and an air damper feedback module; the temperature detection module, the drive circuit module U2, and the air damper feedback module are all electrically connected to the MCU module U1.

[0073] It should be understood that the MCU module is a microprocessor.

[0074] The MCU module is configured to: detect the temperature of the refrigerator compartment through the temperature detection module.

[0075] Generate an air damper control instruction according to the temperature of the refrigerator compartment, so as to adjust the opening degree of the air damper through the drive circuit module U2.

[0076] Obtain the actual air damper position voltage in real time through the air damper feedback module.

[0077] Judge whether the actual air damper position is abnormal according to the actual air damper position voltage and the target position voltage.

[0078] If the actual air damper position is abnormal, execute the air damper initialization program through the drive circuit module U2.

[0079] If the actual air damper position is normal, continue to obtain the actual air damper position voltage in real time through the air damper feedback module.

[0080] It should be understood that the air damper initialization program includes controlling the air damper to close completely through the drive circuit module U2 and then re-executing the target opening action.

[0081] The refrigerator air damper with feedback electronic control device monitors the temperature of the refrigerator compartment in real time through the temperature detection module. The MCU module U1 generates an air damper control instruction according to the temperature data and adjusts the opening degree of the air damper through the drive circuit module U2. At the same time, the air damper feedback module is used to obtain the actual air damper position voltage, judge the air damper position state by comparing with the target position voltage, execute the initialization program when abnormal, automatically repair the air damper abnormality, thereby improving the air damper control accuracy, reducing the temperature fluctuation, and enhancing the operating stability of the refrigerator, and solving the problem that the failure of the refrigerator air damper reduces the operating reliability of the refrigeration system.

[0082] In some embodiments, the temperature detection module includes: a compartment temperature sensor Rt1, a first voltage-dividing resistor R2, a first filtering capacitor C3, and a first current-limiting resistor R5; one end of the compartment temperature sensor Rt1 is connected to the power supply VCC and the power supply pin VDD of the MCU module, the other end of the compartment temperature sensor Rt1 is connected to one end of the first voltage-dividing resistor R2, and the other end of the first voltage-dividing resistor R2 is grounded; the first filtering capacitor C3 is connected in parallel with the first voltage-dividing resistor R2; one end of the first current-limiting resistor R5 is connected between the compartment temperature sensor Rt1 and the first voltage-dividing resistor R2, and the other end of the first current-limiting resistor R5 is connected to the first analog quantity acquisition port AD1 of the MCU module.

[0083] It should be understood that the compartment temperature sensor Rt1 can be an NTC thermistor. The NTC thermistor (Negative Temperature Coefficient Thermistor) is a thermistor with a negative temperature coefficient, and its resistance value decreases significantly with the increase of temperature.

[0084] The temperature detection module forms a voltage-dividing circuit through the compartment temperature sensor Rt1 and the first voltage-dividing resistor R2, filters the signal in combination with the first filtering capacitor C3, and transmits the signal to the first analog quantity acquisition port AD1 of the MCU module through the first current-limiting resistor R5, thereby reducing the noise interference of the temperature detection signal, improving the accuracy of temperature acquisition, enhancing the stability of the refrigerator compartment temperature monitoring, and solving the problem that the failure of the refrigerator air damper reduces the operating reliability of the refrigeration system.

[0085] In some embodiments, the MCU module further includes a negative pole pin VSS and a reset pin RESET; the negative pole pin VSS is grounded, and a decoupling capacitor C1 is provided between the negative pole pin VSS and the power supply pin VDD for power supply filtering and transient current compensation to ensure the stable operation of the MCU module. A decoupling capacitor C2 is provided between the negative pole pin VSS and the reset pin RESET, and the reset pin RESET is connected to the power supply pin VDD through a pull-up resistor R1.

[0086] In some embodiments, the driving circuit module U2 includes: an enable pin ENA, a first input port IN1, a second input port IN2, a first output port OUT1, a second output port OUT2, a third output port OUT3, and a fourth output port OUT4; the enable pin ENA is connected to the first pulse output terminal DO1 of the MCU module U1; the first input port IN1 is connected to the second pulse output terminal DO2 of the MCU module U1; the second input port IN2 is connected to the third pulse output terminal DO3 of the MCU module U1; the first output port OUT1 is connected to the positive terminal AA+ of the first-phase coil of the stepping motor for driving the air damper Fm1, and the second output port OUT2 is connected to the negative terminal AA- of the first-phase coil; the third output port OUT3 is connected to the positive terminal BB+ of the second-phase coil of the stepping motor for driving the air damper Fm1, and the fourth output port OUT4 is connected to the negative terminal BB- of the second-phase coil.

[0087] It should be understood that the air damper driving module U2 can be an optional four-channel DC motor driving chip with an ultra-low power consumption sleep mode. This solution is used to control the motor inside the air damper to rotate forward and reverse, and enter the ultra-low power consumption sleep mode during standby to achieve the purpose of energy saving. This chip integrates functions such as undervoltage protection, overtemperature protection, and output short-circuit protection; the first input port IN1 and the second input port IN2 are compatible with 5V and 3.3V signal controls and have good anti-interference performance.

[0088] The driving circuit module U2 receives the pulse control signal of the MCU module through the enable pin ENA and the input port, and is connected to the two-phase coils of the stepping motor through the output port, so as to achieve precise driving of the air damper stepping motor, improve the response speed of the air damper opening adjustment, reduce the control delay, and improve the stability of the air damper position control.

[0089] See Figure 1 , the driving circuit module U2 further includes a power supply positive pin VCC, a ground pin GND, and an unconnected pin NC; the power supply positive pin VCC is connected to the voltage source and one end of the capacitor C6, the other end of the capacitor C6 is grounded, the ground pin GND is grounded, and the unconnected pin NC is left floating. Among them, the voltage source is a 12V power supply. The capacitor C6 plays a role in filtering and energy storage.

[0090] In some embodiments, the refrigerator air damper with feedback electronic control device further includes a heating module; the heating module is electrically connected to the MCU module U1.

[0091] It should be understood that the heating module can be arranged in the contact area between the air damper blade and the housing, and the MCU module U1 can be used to control the energization duration of the heating module.

[0092] The MCU module is configured to: after executing the damper initialization program through the drive circuit module U2, continuously obtain the actual damper position voltage in real time through the damper feedback module.

[0093] Based on the actual damper position voltage and the target position voltage, determine whether the actual damper position is abnormal again.

[0094] If the actual damper position is abnormal again, execute the fault self-repair program through the heating module.

[0095] The refrigerator damper with feedback electronic control device adds a heating module, and starts the fault self-repair program when the position is still detected as abnormal after the damper initialization program, which helps to alleviate the jamming problem of the damper caused by frosting or icing, and improves the operation reliability of the damper in a low-temperature environment.

[0096] In some embodiments, the heating module includes: a heating resistor Rw1, a first switch Q1, a second switch Q2, a second current-limiting resistor R7, a third current-limiting resistor R8, and a second filter capacitor C7; one end of the heating resistor Rw1 is connected to the source electrode of the second switch Q2, and the other end of the heating resistor Rw1 is grounded; the drain electrode of the second switch Q2 is connected to a voltage source, the gate electrode of the second switch Q2 is connected to the collector of the first switch Q1 through the third current-limiting resistor R8, and the collector of the first switch Q1 is connected to the drain electrode of the second switch Q2 through the second current-limiting resistor R7; the emitter of the first switch Q1 is grounded, and the base electrode of the first switch Q1 is connected to the fourth pulse output terminal DO4 of the MCU module U1; one end of the second filter capacitor C7 is grounded, and the other end of the second filter capacitor C7 is connected to the source electrode of the second switch Q2.

[0097] It should be understood that the voltage source is a 12V power supply. The heating module realizes the controlled on-off of the heating resistor Rw1 through the cascaded control of the first switch Q1 and the second switch Q2, in cooperation with the current-limiting resistor and the filter capacitor, which helps to reduce circuit interference, improve the stability of heating control, and at the same time alleviate the abnormal operation problem of the damper mechanism caused by the low-temperature environment, and improve the reliability of fault self-repair.

[0098] In some embodiments, the refrigerator damper with feedback electronic control device further includes a display module; the display module is electrically connected to the MCU module U1.

[0099] The MCU module is configured to: after executing the fault self-repair program through the heating module, continuously obtain the actual damper position voltage in real time through the damper feedback module.

[0100] Based on the actual damper position voltage and the target position voltage, determine whether the actual damper position is still abnormal.

[0101] If the actual damper position is still abnormal, a damper fault information signal is generated.

[0102] The damper fault information signal is transmitted to the display module to display the damper fault information.

[0103] Through the collaborative work of the display module and the MCU module U1, the refrigerator damper with feedback electronic control device generates and displays fault information when the damper position is still detected as abnormal after the fault self-repair program, which helps users understand the damper operation status in a timely manner, improves the convenience of equipment maintenance, and reduces the duration of abnormal operation of the refrigerator caused by damper faults.

[0104] Specifically, the MCU module U1 includes a transmission pin TX and a reception pin RX. The display module is a display board. The input end of the display board is connected to the transmission pin TX, and the output end of the display board is connected to the reception pin RX.

[0105] In some embodiments, the damper feedback module includes: a telescopic impedance Rt3, a third filter capacitor C5, a second voltage-dividing resistor R6, and a fourth current-limiting resistor R9;

[0106] The telescopic impedance Rt3 is arranged on the rotating shaft of the damper. One end of the fourth current-limiting resistor R9 is connected to the second analog quantity acquisition port AD2 of the MCU module, and the other end of the fourth current-limiting resistor R9 is connected to the telescopic impedance Rt3 and one end of the second voltage-dividing resistor R6. The other end of the second voltage-dividing resistor R6 is grounded; the other end of the telescopic impedance Rt3 is connected to the power supply VCC; the third filter capacitor C5 is connected in parallel with the second voltage-dividing resistor R6.

[0107] The damper feedback module forms a voltage-dividing circuit through the telescopic impedance Rt3 and the second voltage-dividing resistor R6, and cooperates with the filtering effect of the third filter capacitor C5 and the signal transmission of the fourth current-limiting resistor R9, which can reduce the interference of the damper position detection signal, improve the accuracy of the damper position feedback, and enhance the precision of the damper opening control.

[0108] In some embodiments, the telescopic impedance Rt3 is a telescopic spring-type linear resistor, and the resistance value of the telescopic spring-type linear resistor changes linearly with the damper opening.

[0109] The damper feedback module uses a telescopic spring-type linear resistor as the detection element, and its resistance value changes linearly with the damper opening, which can convert the mechanical displacement into a linear electrical signal, thereby improving the linearity of the damper position detection, reducing the signal conversion error, and enhancing the accuracy and stability of the damper opening control.

[0110] The specific implementation of the refrigerator air damper with feedback electronic control device is as follows: VCC is divided by Rt1 and R2, filtered by C3, and the voltage signal is transmitted to AD1 of U1 through R5. The current temperature of the refrigerator compartment can be measured through data conversion and comparison. When the temperature is higher than the set value, DO1 of U1 outputs a high level (the enable signal is high-effective), and DO2 and DO3 output corresponding pulse levels according to the working requirements of U2, so that OUT1 of U2 outputs a high level and OUT2 outputs a low level in opposite timings, driving the stepper motor AA / of the air damper Fm1 to rotate forward; OUT3 of U2 outputs a high level and OUT4 outputs a low level in opposite timings, driving the stepper motor BB / of the air damper Fm1 to rotate forward, opening the air damper. According to different given pulse steps, the opening degree of the air damper Fm1 is different, and the telescopic resistor Rt3 linearly increases as the air damper Fm1 slowly opens. VCC is divided by Rt3 and R6, filtered by the capacitor C5, and input to AD2 of U1 through R9. According to the comparison between the collected value and the theoretical value, it is determined whether the current opened position of the air damper conforms to the given control position. If it is opened but the difference from the theoretical position is too large, there may be out-of-step or other abnormalities, and the air damper initialization program is executed. OUT1 of U2 outputs a low level and OUT2 outputs a high level in opposite timings, driving the stepper motor AA / of the air damper Fm1 to rotate forward and backward; OUT3 of U2 outputs a low level and OUT4 outputs a high level in opposite timings, driving the stepper motor BB / of the air damper Fm1 to rotate backward, closing the air damper. The signal of the analog acquisition port AD2 of U1 is detected, and after conversion, it is compared with the theoretical value of the closed position. If they are consistent, the opening command is executed again to open the air damper. Then, if the value of AD2 is detected to be close to the theoretical value, it indicates that the air damper has been normally opened. If the AD2 acquisition values do not change in both detections, the air damper may be frozen. At this time, the software fault self-repair program is started to try to restore normal control: the high level output by the DO4 port of U1 makes Q1 and Q2 conduct, and the heater Rw1 is powered on to start heating. After heating for t minutes, the air damper initialization program is executed, and then the air damper opening command is executed. If the air damper is opened to the specified position, it indicates that the air damper has returned to normal. If the position remains unchanged, it indicates that the air damper has been damaged or there are uncontrollable abnormalities such as damage to the driving device. The air damper fault information is sent to the display through TX of U1 for convenient fault determination and repair.

[0111] Some embodiments of this application also provide a refrigerator air damper with feedback electronic control method, which is applied to the refrigerator air damper with feedback electronic control device described in the above embodiments. Refer to Figure 2 , the method includes:

[0112] Detect the temperature of the refrigerator compartment through the temperature detection module.

[0113] Generate an air damper control instruction according to the temperature of the refrigerator compartment to adjust the opening degree of the air damper through the driving circuit module U2.

[0114] Obtain the actual air damper position voltage in real time through the air damper feedback module.

[0115] Based on the actual damper position voltage and the target position voltage, determine whether the actual damper position is abnormal.

[0116] If the actual damper position is abnormal, execute the damper initialization program through the drive circuit module U2.

[0117] If the actual damper position is normal, continue to obtain the actual damper position voltage in real time through the damper feedback module.

[0118] The method monitors the temperature of the refrigerator compartment in real time through the temperature detection module, generates a damper control instruction by the MCU module according to the temperature data and adjusts the damper opening through the drive circuit module. At the same time, the actual damper position voltage is obtained by using the damper feedback module, and the damper position status is judged by comparing with the target position voltage. When it is abnormal, the initialization program is executed, so as to improve the damper control accuracy, reduce the temperature fluctuation, enhance the operation stability of the refrigerator, and solve the problem that the failure of the refrigerator damper reduces the operation reliability of the refrigeration system.

[0119] In some embodiments, refer to Figure 2 , after executing the damper initialization program through the drive circuit module U2, the method further includes:

[0120] Continue to obtain the actual damper position voltage in real time through the damper feedback module.

[0121] Based on the actual damper position voltage and the target position voltage, judge whether the actual damper position is abnormal again.

[0122] If the actual damper position is abnormal again, execute the fault self-repair program through the heating module.

[0123] Continue to obtain the actual damper position voltage in real time through the damper feedback module.

[0124] Based on the actual damper position voltage and the target position voltage, judge whether the actual damper position is still abnormal.

[0125] If the actual damper position is still abnormal, generate a damper fault information signal.

[0126] Transmit the damper fault information signal to the display module to display the damper fault information.

[0127] After executing the damper initialization program, the method continuously monitors the damper position status, starts the heating module for fault self-repair when detecting abnormal again, and outputs fault information through the display module when continuously abnormal, thus forming a multi-level fault handling mechanism, which helps to alleviate the damper jamming problem, improve the system self-repair ability, reduce the difficulty of fault troubleshooting, and enhance the convenience of equipment maintenance.

[0128] As can be seen from the above technical solutions, the embodiments of the present application provide a refrigerator air damper with feedback electric control device and method. The device includes: an MCU module U1, a temperature detection module, a drive circuit module U2, and an air damper feedback module; the temperature detection module, the drive circuit module U2, and the air damper feedback module are all electrically connected to the MCU module U1; the MCU module U1 detects the temperature of the refrigerator compartment through the temperature detection module; generates an air damper control instruction according to the temperature of the refrigerator compartment to adjust the air damper opening through the drive circuit module U2; obtains the actual air damper position voltage in real time through the air damper feedback module; determines whether the actual air damper position is abnormal according to the actual air damper position voltage and the target position voltage; if the actual air damper position is abnormal, executes an air damper initialization program through the drive circuit module U2; if the actual air damper position is normal, continues to obtain the actual air damper position voltage in real time through the air damper feedback module to solve the problem that the failure of the refrigerator air damper reduces the operation reliability of the refrigeration system.

[0129] For the similarities between the embodiments provided in the present application, reference can be made to each other. The specific embodiments provided above are only several examples under the general concept of the present application and do not constitute a limitation on the protection scope of the present application. For those skilled in the art, any other embodiments extended based on the solutions of the present application without creative efforts belong to the protection scope of the present application.

Claims

1. A refrigerator air door with feedback electronic control device, characterized in that: include: MCU module, temperature detection module, drive circuit module and damper feedback module; The temperature detection module, the drive circuit module and the damper feedback module are all electrically connected to the MCU module; the MCU module is configured as follows: Detect the refrigerator compartment temperature through the temperature detection module; generating a damper control instruction according to the refrigerator compartment temperature to adjust the damper opening through a drive circuit module; The actual damper position voltage is obtained in real time through the damper feedback module; determining whether the actual damper position is abnormal according to the actual damper position voltage and the target position voltage; If the actual damper position is abnormal, a damper initialization program is executed through the driving circuit module; If the actual damper position is normal, the actual damper position voltage is continuously acquired in real time through the damper feedback module.

2. The refrigerator air door feedback electric control device according to claim 1, characterized in that: The temperature detection module includes: a compartment temperature sensor, a first voltage-dividing resistor, a first filter capacitor, and a first current-limiting resistor; One end of the compartment temperature sensor is connected to the power supply and the power supply pin of the MCU module, the other end of the compartment temperature sensor is connected to one end of the first voltage-dividing resistor, and the other end of the first voltage-dividing resistor is grounded; The first filter capacitor is connected in parallel with the first voltage-dividing resistor; one end of the first current-limiting resistor is connected between the compartment temperature sensor and the first voltage-dividing resistor, and the other end of the first current-limiting resistor is connected to the first analog quantity acquisition port of the MCU module.

3. The refrigerator air door feedback electric control device according to claim 1, characterized in that: The driving circuit module includes: an enable pin, a first input port, a second input port, a first output port, a second output port, a third output port, and a fourth output port; The enable pin is connected to the first pulse output terminal of the MCU module; the first input port is connected to the second pulse output terminal of the MCU module; the second input port is connected to the third pulse output terminal of the MCU module; The first output port is connected to the positive end of the first phase coil of the stepper motor used to drive the damper, and the second output port is connected to the negative end of the first phase coil; the third output port is connected to the positive end of the second phase coil of the stepper motor used to drive the damper, and the fourth output port is connected to the negative end of the second phase coil.

4. The refrigerator air door feedback electric control device according to claim 1, characterized in that: Also included is a heating module; The heating module is electrically connected to the MCU module; the MCU module is configured as follows: After executing the damper initialization program through the driving circuit module, the actual damper position voltage is obtained in real time through the damper feedback module; determining whether the actual damper position is abnormal again according to the actual damper position voltage and the target position voltage; If the actual damper position is abnormal again, the fault self-repair program is executed through the heating module.

5. The refrigerator air door feedback electric control device according to claim 4, characterized in that: The heating module includes: a heating resistor, a first switch, a second switch, a second current limiting resistor, a third current limiting resistor and a second filter capacitor; One end of the heating resistor is connected to the source of the second switch, and the other end of the heating resistor is grounded; the drain of the second switch is connected to a voltage source, the gate of the second switch is connected to the collector of the first switch through a third current limiting resistor, and the collector of the first switch is connected to the drain of the second switch through a second current limiting resistor; the emitter of the first switch is grounded, and the base of the first switch is connected to the fourth pulse output terminal of the MCU module; One end of the second filter capacitor is grounded, and the other end of the second filter capacitor is connected to the source of the second switch.

6. The refrigerator air door feedback electric control device according to claim 4, characterized in that: Also includes a display module; The display module is electrically connected to the MCU module; the MCU module is configured as follows: After executing the fault self-repair program through the heating module, the actual damper position voltage is continuously obtained in real time through the damper feedback module; Determining whether the actual damper position is still abnormal according to the actual damper position voltage and the target position voltage; If the actual damper position is still abnormal, a damper fault information signal is generated; The damper fault information signal is transmitted to the display module to display the damper fault information.

7. The refrigerator air door feedback electric control device according to claim 1, characterized in that: The damper feedback module includes: a retractable resistor, a third filter capacitor, a second voltage-dividing resistor, and a fourth current-limiting resistor; The retractable resistor is arranged on the rotating shaft of the damper, one end of the fourth current limiting resistor is connected to the second analog quantity acquisition port of the MCU module, the other end of the fourth current limiting resistor is connected to the retractable resistor and one end of the second voltage dividing resistor, and the other end of the second voltage dividing resistor is grounded; the other end of the retractable resistor is connected to the power supply; the third filter capacitor is connected in parallel with the second voltage dividing resistor.

8. The refrigerator air door feedback electric control device according to claim 7, characterized in that: The retractable resistor is a retractable spring type linear resistor, and the resistance value of the retractable spring type linear resistor changes linearly with the air door opening.

9. A refrigerator damper with feedback electronic control method, characterized in that: The refrigerator damper with feedback electric control device applied to any one of claims 1 to 8, the method comprising: Detect the refrigerator compartment temperature through the temperature detection module; generating a damper control instruction according to the refrigerator compartment temperature to adjust the damper opening through a drive circuit module; The actual damper position voltage is obtained in real time through the damper feedback module; determining whether the actual damper position is abnormal according to the actual damper position voltage and the target position voltage; If the actual damper position is abnormal, a damper initialization program is executed through the driving circuit module; If the actual damper position is normal, the actual damper position voltage is continuously acquired in real time through the damper feedback module.

10. The refrigerator damper feedback electric control method according to claim 9, characterized in that: After the damper initialization program is executed by the driving circuit module, the method further includes: Continue to obtain the actual damper position voltage in real time through the damper feedback module; determining whether the actual damper position is abnormal again according to the actual damper position voltage and the target position voltage; If the actual damper position is abnormal again, the fault self-repair program is executed through the heating module; Continue to obtain the actual damper position voltage in real time through the damper feedback module; Determining whether the actual damper position is still abnormal according to the actual damper position voltage and the target position voltage; If the actual damper position is still abnormal, a damper fault information signal is generated; The damper fault information signal is transmitted to a display module to display the damper fault information.

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