Door hinges for household appliances, household appliances, and methods for controlling the opening and closing of household appliances.

Abstract

This invention relates to a door hinge for household appliances, the household appliance itself, and a method for controlling the opening and closing of the household appliance. The door hinge includes: a housing; a latch, the first end of which is hinged to the front end of the housing; a transmission assembly, the output end of which is hinged to the first end of the latch; a motor, the power output shaft of which has a first limiting part and a second limiting part; and a crank, sleeved on the power output shaft of the motor, the crank constrained between the first and second limiting parts, and rotatably connected to the input end of the transmission assembly. In a first state, the crank moves back and forth on the power output shaft of the motor, approaching the first or second limiting part respectively; in a second state, the crank abuts against the first or second limiting part, allowing the crank to rotate with the motor under the drive of the first or second limiting part, thereby driving the transmission assembly to reciprocate along the length of the housing. This door hinge, based on an electric hinge, enables manual opening and closing of the door in the event of a power outage.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and in particular to a door hinge for household appliances, a household appliance, and a method for controlling the opening and closing of household appliances. Background Technology

[0002] The doors of household appliances such as steam ovens, ovens, and microwave ovens are mounted on the cabinet by hinges on the left and right sides at the bottom, allowing them to rotate back and forth. For example, Chinese utility model patent No. ZL 202022529893.2 (authorization announcement No. CN213909874U) discloses a hinge device for an air oven.

[0003] There are many types of existing hinge structures, but most hinges are currently mechanical and manual. For example, Chinese utility model patent ZL201320130245.7 (authorization announcement number CN203175236U) discloses an oven door hinge, which has problems such as getting hot to the touch and cannot adapt to the trend of electrification and intelligence. A small number of hinges have achieved electrification, but they have the problem of not being able to operate when the power is off, affecting the use of the whole machine in special circumstances.

[0004] In addition, in conventional door opening and closing control, current is mostly used to monitor whether an obstacle is encountered to control the door to stop, such as the doors of refrigerators and cabinets. However, in steam ovens, because the door is flipped open, the required torque changes due to the change in the center of gravity of the door during the entire opening or closing process, which causes the current to change as well. Since the current is unstable during the movement and fluctuates over a wide range, the traditional current judgment is very ineffective in the opening and closing control of cooking equipment with this type of structure.

[0005] Therefore, further improvements to existing technologies are needed. Summary of the Invention

[0006] The first technical problem to be solved by the present invention is to provide a door hinge for household appliances that can realize both manual and automatic operation and solve the problem of opening and closing the door when the power is off, in contrast to the above-mentioned prior art.

[0007] The second technical problem to be solved by the present invention is to provide a household appliance having the above-mentioned door hinge.

[0008] The third technical problem to be solved by the present invention is to provide a method for controlling the opening and closing of the above-mentioned household appliances, which can adapt to emergency handling of electric doors under various working conditions and has a better control effect.

[0009] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a door hinge for household appliances, comprising:

[0010] The casing is long and narrow, used to connect to the inner frame of household appliances;

[0011] The tongue has a first end hinged to the front end of the housing via a first pin extending along the width of the housing, and a second end used to connect to the door body.

[0012] A transmission assembly is disposed inside the housing along the length of the housing, and the output end of the transmission assembly is hinged to the first end of the tongue strip through a first hinge shaft parallel to the first pin shaft;

[0013] Its features also include:

[0014] The motor has a power output shaft arranged along the width direction of the housing, and the power output shaft is provided with a first limiting part and a second limiting part arranged at intervals.

[0015] A crank is sleeved on the power output shaft of a motor. The crank is constrained between a first limiting part and a second limiting part in a manner that allows it to move along the extension direction of the power output shaft of the motor. The crank is rotatably connected to the input end of a transmission assembly. During motor rotation, the crank has at least the following two states:

[0016] In the first state, the crank moves back and forth on the power output shaft of the motor and approaches the first limiting part or the second limiting part respectively;

[0017] In the second state, the crank abuts against the first limiting part or the second limiting part, so that the crank can rotate together with the motor under the drive of the first limiting part or the second limiting part, thereby driving the transmission component to reciprocate along the length direction of the housing.

[0018] In order to enable manual opening and closing of the door, the power output shaft of the motor is provided with an external thread on the outer peripheral wall located between the first limiting part and the second limiting part, and the crank is provided with an internal thread that is threadedly connected to the external thread on the power output shaft of the motor.

[0019] There are many types of transmission components. Preferably, the transmission component includes at least two connecting rods arranged sequentially along the length of the housing. Two adjacent connecting rods are hinged to each other in sequence. The front end of the foremost connecting rod is the output end of the transmission component, and the rear end of the rearmost connecting rod is the input end of the transmission component.

[0020] Preferably, there are two connecting rods, namely a first connecting rod and a second connecting rod. The front end of the first connecting rod is hinged to the bottom end of the tongue through a first hinge shaft. The rear end of the first connecting rod and the front end of the second connecting rod are hinged to the housing through a second hinge shaft. The rear end of the second connecting rod is rotatably connected to the crank through a third hinge shaft.

[0021] In order to limit the opening and closing angle of the door, guide sliding holes extending along their length are respectively provided on the two side walls of the housing. The two ends of the second hinge shaft are respectively inserted into the corresponding guide sliding holes. The second hinge shaft can slide back and forth along the length of the guide sliding holes on both sides and the two ends are respectively guided and engaged with the corresponding guide sliding holes.

[0022] In order to provide tension to the transmission components, the door hinge also includes a first pull bar and a second pull bar arranged along the length of the housing. The first pull bar and the second pull bar are respectively located on both sides of the second connecting rod. The front ends of the first pull bar and the second pull bar are mounted on the second hinge shaft. The rear ends of the first pull bar and the second pull bar are hinged to the housing through a first mounting shaft.

[0023] Furthermore, the door hinge also includes a tension spring arranged along the length of the housing, a second mounting shaft is installed at the rear end of the housing, the front end of the tension spring is mounted on the first mounting shaft, and the rear end of the tension spring is mounted on the second mounting shaft.

[0024] In order to monitor different states of door opening and closing, a first elastic element and a second elastic element are provided inside the housing, located on both sides of the crank. Both the first elastic element and the second elastic element act on the crank, and the first elastic element and the second elastic element are always in a compressed state.

[0025] To enable force detection on the door during opening and closing, the following are also included:

[0026] The first stress strain gauge is used to detect the stress value of the first elastic element;

[0027] The second stress strain gauge is used to detect the stress value of the second elastic element;

[0028] The controller is electrically connected to the first strain gauge, the second strain gauge, and the motor, and is configured to determine the current state of the door based on the detection results of the first strain gauge and the second strain gauge, and control the motor to perform corresponding actions.

[0029] The technical solution adopted by the present invention to solve the second technical problem mentioned above is: a household appliance, characterized in that: it has a door hinge for a household appliance as described above.

[0030] The technical solution adopted by the present invention to solve the third technical problem mentioned above is: a door opening and closing control method for the aforementioned household appliance, characterized by comprising the following steps:

[0031] Step 1: Determine if the door of the current household appliance is fully open. If yes, proceed to step 4; otherwise, proceed to step 2.

[0032] Step 2: Determine whether the door of the current household appliance is completely closed. If yes, proceed to step 5; otherwise, it means that the door of the current household appliance is in a suspended state, and proceed to step 3.

[0033] Step 3: Measure the stress value p1 of the first elastic element using the first strain gauge and the stress value p2 of the second elastic element using the second strain gauge. Calculate the absolute value of the difference between p1 and p2, |Δp|, and make the following judgments:

[0034] When |Δp|≤P, where P is a preset threshold, and p1>p2, it means that the door encountered an obstacle during the closing process and the door has now been reset, proceeding to step 4;

[0035] If |Δp|≤P and p1<p2, it means that the door encountered an obstacle during the opening process and the door has now been reset, so proceed to step 5;

[0036] Step 4: Perform the door closing action until p1 > P1max, where P1max is the maximum preset stress value of the first elastic element. Detect whether the door of the current household appliance is in a fully closed state. If yes, end the process; otherwise, if there is an obstacle blocking the way, proceed to step 6.

[0037] Step 5: Execute the switch action until p2 > P2max, where P2max is the maximum preset stress value of the second elastic element. Detect whether the door of the current household appliance is in the open or fully closed state. If yes, end the process; otherwise, if there is an obstacle blocking the way, proceed to step 6.

[0038] Step 6: Control the motor to rotate in the opposite direction until |Δp|≤P, then the door reset is complete and the process ends.

[0039] In order to also distinguish power outage situations, step 3 also includes the following judgment:

[0040] If |Δp|>P and p1>p2, it means that the door lost power during the closing process;

[0041] If |Δp|>P and p1<p2, it means that the door lost power during the opening process.

[0042] In order to achieve door opening and closing control after power failure, the household appliance also includes a backup power supply for the motor. The backup power supply works when the power is cut off during the closing or opening of the door, and controls the motor to rotate n revolutions in the opposite direction, where n is a preset value.

[0043] Compared with existing technologies, the advantages of this invention are as follows: First, by mounting the crank on the power output shaft of the motor, before the crank encounters the first and second limiting parts, the crank is constrained between the first and second limiting parts in a manner that allows it to move along the extension direction of the power output shaft of the motor. After the crank encounters or is stopped by the first or second limiting part, the power output shaft of the motor drives the crank to rotate together. The crank drives the connecting rod assembly to perform a linear reciprocating motion, which in turn drives the latch to perform a swing arm motion, thus realizing the movement of the door. Second, in the event of a power outage, when manually opening and closing the door, the latch transmits the motion in the reverse direction to the crank. Due to the self-locking of the motor, the power output shaft of the motor does not rotate, only the crank rotates, thereby realizing the manual opening and closing action of the door. Therefore, this door hinge, based on an electric hinge, realizes the manual opening and closing action of the hinge in the event of a power outage. It has a simple structure and improves the user experience. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the door hinge structure in an embodiment of the present invention;

[0045] Figure 2 for Figure 1 Partial structural diagram (mounting base omitted);

[0046] Figure 3 for Figure 1 Another perspective structural diagram;

[0047] Figure 4 for Figure 1 Partial structural diagram (excluding housing and mounting base);

[0048] Figure 5 for Figure 1 A cross-sectional view along the length of the shell;

[0049] Figure 6 for Figure 1 A cross-sectional view along the width of the shell;

[0050] Figure 7 for Figure 1 The exploded diagram. Detailed Implementation

[0051] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0052] The household appliance in this embodiment includes a door (not shown in the figure) and an inner liner (not shown in the figure). The functional sides of the lower end of the door are hinged to the frame of the inner liner via door hinges. The household appliances in this invention include, but are not limited to, cooking equipment such as steam ovens, ovens, and microwave ovens, as well as dishwashers, refrigerators, and disinfection cabinets, or combination appliances integrating at least one of the above.

[0053] like Figures 1-7 As shown, the door hinge in this embodiment includes a housing 1, a mounting base a, a tongue strip 2, a connecting rod assembly 3, a motor 4, and a crank 5.

[0054] The housing 1 is elongated and connected to the inner frame of the household appliance. The cross-section of the housing 1 is U-shaped with the opening facing downwards, and the cross-section of the mounting base a is U-shaped with the opening facing upwards. The housing 1 is installed in the mounting base a. Support blocks 1a are provided on both sides of the mounting base a to support the bottom of the housing 1, so that a space 1b is formed between the bottom of the housing 1 and the bottom of the mounting base a. The mounting base a is fixedly installed with the housing 1, and the space 1b is used for the crank 5 to rotate.

[0055] The first end of the tongue strip 2 is hinged to the front end of the housing 1 via a first pin 13 extending along the width direction of the housing 1, and the second end of the tongue strip 2 is used to connect to the door body; the transmission assembly 3 is disposed inside the housing 1 along the length direction of the housing 1, and the output end of the transmission assembly 3 is hinged to the first end of the tongue strip 2 via a first hinge shaft 61 parallel to the first pin 13; the power output shaft 41 of the motor 4 is arranged along the width direction of the housing 1, and its power output shaft 41 is provided with a first limiting part 411 and a second limiting part 412 arranged at intervals; Figure 4 As shown, in this embodiment, the first limiting part 411 is a stepped part, and the second limiting part 412 is a retaining ring sleeved on the power output shaft 41 of the motor 4; Figure 6 As shown, in this embodiment, the power output shaft 41 of the motor 4 has an external thread on its outer peripheral wall located between the first limiting part 411 and the second limiting part 412, and the crank 5 has an internal thread that is threadedly connected to the external thread on the power output shaft 41 of the motor 4. In this way, the power output shaft 41 of the motor 4 does not rotate, but only the crank 5 rotates, thereby realizing the manual opening and closing of the door.

[0056] The crank 5 is sleeved on the power output shaft 41 of the motor 4. The crank 5 is constrained between the first limiting part 411 and the second limiting part 412 in a manner that allows it to move along the extension direction of the power output shaft 41 of the motor 4. The crank 5 is rotatably connected to the input end of the transmission assembly 3. During the rotation of the motor 4, the crank 5 has at least the following two states: In the first state, the crank 5 moves back and forth on the power output shaft 41 of the motor 4 and approaches the first limiting part 411 or the second limiting part 412 respectively; In the second state, the crank 5 abuts against the first limiting part 411 or the second limiting part 412, so that the crank 5 can rotate with the motor 4 under the drive of the first limiting part 411 or the second limiting part 412, thereby driving the transmission assembly 3 to reciprocate along the length direction of the housing 1.

[0057] The transmission assembly 3 includes at least two connecting rods arranged sequentially along the length of the housing 1. Adjacent connecting rods are hinged together sequentially. The front end of the foremost connecting rod is the output end of the transmission assembly 3, and the rear end of the rearmost connecting rod is the input end of the transmission assembly 3. For example... Figure 5 and Figure 7 As shown, in this embodiment, there are two connecting rods, namely a first connecting rod 31 and a second connecting rod 32. The front end of the first connecting rod 31 is hinged to the bottom end of the tongue 2 via a first hinge shaft 61. The rear end of the first connecting rod 31 is hinged to the front end of the second connecting rod 32 on the housing 1 via a second hinge shaft 62. The rear end of the second connecting rod 32 is rotatably connected to the crank 5 via a third hinge shaft 63 (e.g., Figure 7 As shown, the third hinge shaft 63 is mounted on the crank 5, and a bearing is sleeved on the third hinge shaft 63. The rear end of the second connecting rod 32 has a through hole 321 that can be sleeved on the bearing. In addition, guide sliding holes 11 extending along their length direction are respectively opened on the two side walls of the housing 1. The two ends of the second hinge shaft 62 are respectively inserted into the corresponding guide sliding holes 11. The second hinge shaft 62 can slide back and forth along the length direction of the guide sliding holes 11 on both sides, and its two ends are respectively guided and engaged with the corresponding guide sliding holes 11. By limiting the second hinge shaft 62 at both ends of the guide sliding holes 11, the opening and closing angle of the door can be controlled.

[0058] like Figure 4 and Figure 7 As shown, the door hinge also includes a first pull bar 71, a second pull bar 72, and a tension spring 9 arranged along the length of the housing 1. The first pull bar 71 and the second pull bar 72 are located on both sides of the second connecting rod 32. The front ends of the first pull bar 71 and the second pull bar 72 are mounted on the second hinge shaft 62. The rear ends of the first pull bar 71 and the second pull bar 72 are hinged to the housing 1 through the first mounting shaft 81. The second mounting shaft 82 is mounted at the rear end of the housing 1. The front end of the tension spring 9 is mounted on the first mounting shaft 81, and the rear end of the tension spring 9 is mounted on the second mounting shaft 82.

[0059] like Figure 3 As shown, a first elastic element 101 and a second elastic element 102 are also provided inside the housing 1, located on both sides of the crank 5. Both the first elastic element 101 and the second elastic element 102 act on the crank 5, and are always in a compressed state. In this embodiment, both the first elastic element 101 and the second elastic element 102 are springs, and to prevent the springs from moving, as shown... Figure 7 As shown, two positioning posts 12 are also provided on the inner wall of the housing 1, which are positioned toward the crank 5, and each spring is sleeved on the corresponding positioning post 12.

[0060] In addition, this embodiment also includes a first strain gauge (not shown in the figure), a second strain gauge (not shown in the figure), and a controller (not shown in the figure). The first strain gauge is used to detect the stress value of the first elastic element 101, and the second strain gauge is used to detect the stress value of the second elastic element 102. The controller is electrically connected to the first strain gauge, the second strain gauge, and the motor 4, and is configured to: determine the current state of the door body based on the detection results of the first strain gauge and the second strain gauge, and control the motor 4 to perform corresponding actions.

[0061] In this embodiment, the power output shaft 41 of the motor 4 rotates. Under the action of the thread, the crank 5 moves to the left or right first. During this process, the door does not move, which is called "no-load stroke". After the crank 5 is stopped by the first limit part 411 or the second limit part 412, the power output shaft 41 of the motor 4 will drive the crank 5 to rotate together. The crank 5 drives the second hinge shaft 62 to perform a linear reciprocating motion, which in turn drives the first connecting rod 31 to drive the tongue 2 to perform a swing arm motion, thereby realizing the movement of the door. During the whole process, the tension spring 9 provides tension to assist in holding the second hinge shaft 62. In the case of power failure, when manually opening and closing the door, the tongue 2 transmits the motion in the opposite direction to the crank 5. Due to the self-locking of the motor, the power output shaft 41 of the motor 4 does not rotate. Utilizing the thread between the crank 5 and the power output shaft 41 of the motor 4, only the crank 5 rotates along the thread on the power output shaft 41 of the motor 4, thereby realizing the action of manually opening and closing the door.

[0062] The opening and closing control method for the above-mentioned household appliances includes the following steps:

[0063] Step 1: Determine if the door of the current household appliance is fully open. If yes, proceed to step 4; otherwise, proceed to step 2.

[0064] Step 2: Determine whether the door of the current household appliance is completely closed. If yes, proceed to step 5; otherwise, it means that the door of the current household appliance is in a suspended state, and proceed to step 3.

[0065] Step 3: Measure the stress value p1 of the first elastic element using the first strain gauge and the stress value p2 of the second elastic element using the second strain gauge. Calculate the absolute value of the difference between p1 and p2, |Δp|, and make the following judgments:

[0066] When |Δp|≤P, where P is a preset threshold, and p1>p2, it means that the door encountered an obstacle during the closing process and the door has now been reset, proceeding to step 4;

[0067] If |Δp|≤P and p1<p2, it means that the door encountered an obstacle during the opening process and the door has now been reset, so proceed to step 5;

[0068] Step 4: Perform the door closing action until p1 > P1max, where P1max is the maximum preset stress value of the first elastic element. Detect whether the door of the current household appliance is in a fully closed state. If yes, end the process; otherwise, if there is an obstacle blocking the way, proceed to step 6.

[0069] Step 5: Execute the switch action until p2 > P2max, where P2max is the maximum preset stress value of the second elastic element. Detect whether the door of the current household appliance is in the open or fully closed state. If yes, end; otherwise, it is blocked by an obstacle, and proceed to step 6. The above P2max and P1max can also be the same value.

[0070] Step 6: Control the motor to rotate in the opposite direction until |Δp|≤P, then the door reset is complete and the process ends.

[0071] Step 3 also includes the following judgment: if |Δp|>P and p1>p2, it means that the door was de-energized during the closing process; if |Δp|>P and p1<p2, it means that the door was de-energized during the opening process.

[0072] Household appliances also include a backup power supply for the motor. This backup power supply can be a supercapacitor connected in series in the power supply circuit. It can charge when the power supply circuit is not interrupted and discharge rapidly after the power supply circuit is interrupted. The backup power supply works when the power is interrupted during the closing or opening of the door, controlling the motor to rotate n revolutions in the opposite direction, where n is a preset value. In this embodiment, after the motor rotates n revolutions in the opposite direction, |Δp|>P, which can distinguish whether the hovering is caused by an obstacle or a power outage. At this time, the door is in a half-open state, and the user can manually open the door completely to take out the food, or choose to close it completely.

Claims

1. A door hinge for household appliances, comprising: The shell (1) is long and narrow, and is used to connect to the inner frame of the household appliance; The first end of the tongue (2) is hinged to the front end of the housing (1) by a first pin (13) extending along the width direction of the housing (1), and the second end of the tongue (2) is used to connect to the door of the household appliance. The transmission assembly (3) is disposed inside the housing (1) along the length direction of the housing (1). The output end of the transmission assembly (3) is hinged to the first end of the tongue strip (2) through a first hinge shaft (61) parallel to the first pin shaft (13). Its features also include: The motor (4) has its power output shaft (41) arranged along the width direction of the housing (1), and its power output shaft (41) is provided with a first limiting part (411) and a second limiting part (412) arranged at intervals. A crank (5) is sleeved on the power output shaft (41) of the motor (4). The crank (5) is constrained between the first limiting part (411) and the second limiting part (412) in such a way that it can move along the extension direction of the power output shaft (41) of the motor (4). The crank (5) is rotatably connected to the input end of the transmission assembly (3). The power output shaft (41) of the motor (4) has an external thread on its outer peripheral wall located between the first limiting part (411) and the second limiting part (412), and the crank (5) has an internal thread that is threaded to the external thread on the power output shaft (41) of the motor (4). During the rotation of the motor (4), the crank (5) has at least the following two states: In the first state, the crank (5) moves back and forth on the power output shaft (41) of the motor (4) and approaches the first limiting part (411) or the second limiting part (412) respectively; In the second state, the crank (5) abuts against the first limiting part (411) or the second limiting part (412), so that the crank (5) can rotate together with the motor (4) under the drive of the first limiting part (411) or the second limiting part (412), and then drive the transmission assembly (3) to reciprocate along the length direction of the housing (1).

2. The door hinge according to claim 1, characterized in that: The transmission assembly (3) includes at least two connecting rods arranged sequentially along the length of the housing (1). The two adjacent connecting rods are hinged to each other in sequence. The front end of the connecting rod at the front is the output end of the transmission assembly (3), and the rear end of the connecting rod at the rear is the input end of the transmission assembly (3).

3. The door hinge according to claim 2, characterized in that: There are two connecting rods, namely a first connecting rod (31) and a second connecting rod (32). The front end of the first connecting rod (31) is hinged to the bottom end of the tongue (2) through a first hinge shaft (61). The rear end of the first connecting rod (31) and the front end of the second connecting rod (32) are hinged to the housing (1) through a second hinge shaft (62). The rear end of the second connecting rod (32) is rotatably connected to the crank (5) through a third hinge shaft (63).

4. The door hinge according to claim 3, characterized in that: The housing (1) has guide sliding holes (11) extending along its length on both side walls. The two ends of the second hinge shaft (62) are respectively inserted into the corresponding guide sliding holes (11). The second hinge shaft (62) can slide back and forth along the length of the guide sliding holes (11) on both sides and its two ends are respectively guided and engaged with the corresponding guide sliding holes (11).

5. The door hinge according to claim 4, characterized in that: The door hinge also includes a first pull bar (71) and a second pull bar (72) arranged along the length direction of the housing (1). The first pull bar (71) and the second pull bar (72) are respectively located on both sides of the second connecting rod (32). The front end of the first pull bar (71) and the front end of the second pull bar (72) are mounted on the second hinge shaft (62). The rear end of the first pull bar (71) and the rear end of the second pull bar (72) are hinged to the housing (1) through the first mounting shaft (81).

6. The door hinge according to claim 5, characterized in that: The door hinge also includes a tension spring (9) arranged along the length of the housing (1), and a second mounting shaft (82) is installed at the rear end of the housing (1). The front end of the tension spring (9) is installed on the first mounting shaft (81), and the rear end of the tension spring (9) is installed on the second mounting shaft (82).

7. The door hinge according to any one of claims 1 to 6, characterized in that: The housing (1) also includes a first elastic element (101) and a second elastic element (102) located on both sides of the crank (5). The first elastic element (101) and the second elastic element (102) both act on the crank (5), and the first elastic element (101) and the second elastic element (102) are always in a compressed state.

8. The door hinge according to claim 7, characterized in that: Also includes: The first stress strain gauge is used to detect the stress value of the first elastic element (101); The second stress strain gauge is used to detect the stress value of the second elastic element (102); The controller is electrically connected to the first strain gauge, the second strain gauge and the motor (4) and is configured to: determine the current state of the door based on the detection results of the first strain gauge and the second strain gauge, and control the motor (4) to perform corresponding actions.

9. A household appliance, characterized in that: A door hinge for a household appliance as described in claim 8 above.

10. A method for controlling the opening and closing of a household appliance as described in claim 9, characterized in that... Includes the following steps: Step 1: Determine if the door of the current household appliance is fully open. If yes, proceed to step 4; otherwise, proceed to step 2. Step 2: Determine whether the door of the current household appliance is completely closed. If yes, proceed to step 5; otherwise, it means that the door of the current household appliance is in a suspended state, and proceed to step 3. Step 3: Measure the stress value p1 of the first elastic element using the first strain gauge and the stress value p2 of the second elastic element using the second strain gauge. Calculate the absolute value of the difference between p1 and p2, |Δp|, and make the following judgments: When |Δp|≤P, where P is a preset threshold, and p1>p2, it means that the door encountered an obstacle during the closing process and the door has now been reset, proceeding to step 4; If |Δp|≤P and p1<p2, it means that the door encountered an obstacle during the opening process and the door has now been reset, so proceed to step 5; Step 4: Perform the door closing action until p1 > P1max, where P1max is the maximum preset stress value of the first elastic element. Detect whether the door of the current household appliance is in a fully closed state. If yes, end the process; otherwise, if there is an obstacle blocking the way, proceed to step 6. Step 5: Execute the switch action until p2 > P2max, where P2max is the maximum preset stress value of the second elastic element. Detect whether the door of the current household appliance is in the open or fully closed state. If yes, end the process; otherwise, if there is an obstacle blocking the way, proceed to step 6. Step 6: Control the motor to rotate in the opposite direction until |Δp|≤P, then the door reset is complete and the process ends.

11. The door opening and closing control method according to claim 10, characterized in that: Step 3 also includes the following judgment: If |Δp|>P and p1>p2, it means that the door lost power during the closing process; If |Δp|>P and p1<p2, it means that the door lost power during the opening process.

12. The door opening and closing control method according to claim 11, characterized in that: The household appliance also includes a backup power supply for the motor. The backup power supply operates when the power is cut off during the closing or opening of the door, and controls the motor to rotate n revolutions in the opposite direction, where n is a preset value.

Images