Flip display screen anti-pinch control method, device and dishwasher

Abstract

The present application relates to a method, device and dishwasher for preventing the flip display screen from being pinched; the flip display screen is retracted by controlling the flip motor, and the flip angle of the flip display screen is obtained; if the flip angle is within the angle interval with the risk of pinching, the operating current of the flip motor is obtained; if the operating current has an increasing trend, the duty cycle of the corresponding driving signal of the flip motor is reduced. The flip angle can be used to accurately determine whether the flip display screen is within the angle interval with the risk of pinching, and then according to the changing trend of the operating current, when the operating current has an increasing trend, the duty cycle of the corresponding driving signal of the flip motor is reduced, which can reduce the operating speed of the flip motor, and thus avoid the risk of finger pain and damage caused by the continuous increase in the force between the flip display screen and the finger, thereby realizing the anti-pinch control of the flip display screen, effectively reducing the pain of pinching, and improving the safety of the flip display screen.

Description

Technical Field

[0001] The present application relates to the technical field of display screens, and in particular to a finger pinch prevention control method and device for a flip display screen, and a dishwasher. Background Art

[0002] At present, the intelligence of household kitchen appliances provides users with more convenience and automation functions; the screen of existing built-in dishwashers is often on the front or top side of the door. The former can use a larger screen, but since the height of the machine is usually within 700-850, the screen content is basically not clear from a normal viewing angle, and it is necessary to bend over or squat to operate; the latter is limited by the thickness of the top of the door, and often can only use a narrow and long small screen. The above two are not conducive to user interaction.

[0003] In order to solve the above problems, a flip display screen that can rotate within a certain angle range has been developed. In the interactive state, the screen is controlled by a motor to unfold to an angle suitable for observation, and in the non-interactive state, the screen is retracted to obtain a better appearance. However, due to the introduction of the flip structure, there is a certain risk of pinching the user's fingers when using the display control device, and anti-pinch control is required. Conventional anti-pinch control performs pinch detection by setting a fixed stall current; in actual applications, when pinching actually occurs, based on the fixed stall current, not only will it cause a certain degree of damage to the display itself, but it will also generate a large shear force on the fingers, causing a strong sense of pain to the user's fingers, seriously affecting the user experience.

[0004] With regard to the problem of users feeling strong pain when detecting pinched fingers in the prior art, no effective solution has been proposed so far. Summary of the invention

[0005] Based on this, it is necessary to provide a finger-pinch prevention control method, device and dishwasher for a flip display screen to address the above technical problems.

[0006] In the first aspect, the present application provides a finger pinch prevention control method for a flip display screen, the method comprising: controlling the flip display screen to retract the screen by a flip motor, and obtaining the flip angle of the flip display screen; if the flip angle is within the angle range with finger pinch risk, obtaining the operating current of the flip motor; if the operating current has an increasing trend, reducing the duty cycle of the corresponding drive signal of the flip motor.

[0007] In one of the embodiments, if the operating current is greater than or equal to a preset current threshold, the flip display screen is controlled by a flip motor to flip the screen outward.

[0008] In one of the embodiments, if the operating current has an increasing trend, reducing the duty cycle of the driving signal corresponding to the flipping motor includes: detecting multiple operating currents corresponding to multiple consecutive moments at a preset time interval; determining the current change trend based on the multiple operating currents; if the current change trend is an increasing trend, reducing the duty cycle of the driving signal corresponding to the flipping motor.

[0009] In one embodiment, if the current change trend is an increasing trend, reducing the duty cycle of the drive signal corresponding to the flipping motor includes: if the current change trend is an increasing trend, obtaining the operating current at the current moment and a preset mapping relationship; the preset mapping relationship is a mapping relationship between the operating current-duty cycle-preset current threshold; according to the operating current at the current moment and the preset mapping relationship, reducing the duty cycle of the drive signal corresponding to the flipping motor.

[0010] In one of the embodiments, the method further includes: if the current variation trend is a decreasing trend, increasing the duty cycle of the driving signal corresponding to the flip motor.

[0011] In one embodiment, if the current change trend is a decreasing trend, increasing the duty cycle of the driving signal corresponding to the flipping motor includes: if the current change trend is a decreasing trend, obtaining the operating current at the current moment and a preset mapping relationship; the preset mapping relationship is a mapping relationship between the operating current-duty cycle-preset current threshold; according to the operating current at the current moment and the preset mapping relationship, increasing the duty cycle of the driving signal corresponding to the flipping motor.

[0012] In one of the embodiments, the preset current threshold is updated according to the current operating current and the preset mapping relationship.

[0013] In one of the embodiments, if the flip angle is within the angle range without risk of pinching fingers, the operating current of the flip motor is obtained;

[0014] If the operating current is greater than or equal to the preset current threshold for a continuous preset time, it is determined that the flip display screen is retracted into place.

[0015] In one of the embodiments, the flip display screen is controlled to flip outwards by a flip motor, and the operating current of the flip motor is obtained; if the operating current is greater than or equal to a preset current threshold for a continuous preset time, it is determined that the flip display screen is flipped outwards to the full extent.

[0016] In one of the embodiments, the flip angle of the flip display screen has a critical flip angle; the angle range of the flip display screen between the critical flip angle and the flip display screen being retracted into place is a finger-free angle range; the angle range of the flip display screen between the critical flip angle and the flip display screen being turned outward into place is a finger-pinch risk angle range.

[0017] In one of the embodiments, when the flip display screen is in an angle range without the risk of pinching fingers, the gap width between the flip display screen and any side of the display screen slot that accommodates the flip display screen is less than or equal to a width threshold determined based on a conventional width range of human fingers.

[0018] In one embodiment, if the flip display screen is completely stored in the display screen slot, the flip angle of the flip display screen is 0 degrees, then the critical flip angle satisfies the following formula:

[0019]

[0020] Wherein, h is the thickness of the flip display screen, w is the gap width between the bottom edge of the flip display screen and the display screen slot, w=0~8mm, r is the distance from the bottom edge of the flip display screen to its rotation axis, and the units of h, w, and r are mm. The unit is degree.

[0021] In one of the embodiments, the flip display screen is provided with a micro switch for determining the angle range in which the flip display screen is located, and obtaining the flip angle of the flip display screen includes: obtaining the switch state of the micro switch; if the switch state is an open state, the flip angle is in an angle range with a risk of pinching fingers; if the switch state is a closed state, the flip angle is in an angle range without a risk of pinching fingers.

[0022] On the second aspect, the present application also provides an anti-pinch control device for a flip display screen, the device comprising: an angle acquisition module, used to control the flip display screen to retract the screen through a flip motor, and obtain the flip angle of the flip display screen; a current acquisition module, used to obtain the operating current of the flip motor if the flip angle is within the finger pinch risk angle range; a duty cycle adjustment module, used to reduce the duty cycle of the corresponding drive signal of the flip motor if the operating current has an increasing trend.

[0023] In a third aspect, the present application further provides a dishwasher, comprising a door body, on which a flip display screen is provided, the dishwasher comprising a memory and a processor, the memory storing a computer program, and the processor implementing the method described in any one of the embodiments of the first aspect above when executing the computer program.

[0024] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method described in any one of the embodiments of the first aspect above is implemented.

[0025] The above-mentioned anti-pinch control method, device and dishwasher for the flip display screen control the flip display screen to retract the screen through the flip motor, and obtain the flip angle of the flip display screen; if the flip angle is within the angle range with the risk of pinching, the operating current of the flip motor is obtained; if the operating current has an increasing trend, the duty cycle of the corresponding drive signal of the flip motor is reduced. Through the flip angle, it is possible to accurately determine whether the flip display screen is within the angle range with the risk of pinching, and then according to the changing trend of the operating current, when the operating current has an increasing trend, the duty cycle of the corresponding drive signal of the flip motor is reduced, which can reduce the operating speed of the flip motor, and then avoid the risk of finger pain and damage caused by the continuous increase of the force between the flip display screen and the finger, thereby realizing the anti-pinch control of the flip display screen, effectively reducing the pain of pinching, and improving the safety of the flip display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of a flow chart of a finger pinch prevention control method for a flip display screen in one embodiment;

[0028] Figure 2 is a schematic diagram of a display screen of a dishwasher in one embodiment;

[0029] Figure 3 A schematic diagram of a flow chart of a step of reducing a duty cycle of a driving signal corresponding to a flip motor in an embodiment;

[0030] Figure 4 It is a schematic diagram of a flow chart of a finger pinch prevention control method for a flip display screen in a specific embodiment;

[0031] Figure 5 It is a structural block diagram of a finger pinch prevention control device for a flip display screen in one embodiment;

[0032] Figure 6 FIG. 1 is a diagram showing the internal structure of a dishwasher in one embodiment.

[0033] Description of reference numerals:

[0034] 100. Flip display screen; 200. Door body; 210. Display screen slot. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] Unless otherwise defined, the technical terms or scientific terms involved in this application shall have the general meaning understood by people with general skills in the technical field to which this application belongs. The words "one", "a", "the", "these" and the like in this application do not indicate a quantitative limitation, and they may be singular or plural. The terms "include", "comprise", "have" and any variants thereof involved in this application are intended to cover non-exclusive inclusions; for example, a process, method and system, product or device comprising a series of steps or modules (units) is not limited to the listed steps or modules (units), but may include unlisted steps or modules (units), or may include other steps or modules (units) inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" may mean: A exists alone, A and B exist at the same time, and B exists alone. Generally, the character " / " indicates that the objects associated with each other are in an "or" relationship. The terms "first", "second", "third", etc. in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0037] In one embodiment, Figure 1 As shown, Figure 1 The figure is a flow chart of a method for preventing finger pinching of a flip display screen in one embodiment; the method for preventing finger pinching of a flip display screen comprises the following steps:

[0038] Step S101, controlling the flip display screen by a flip motor to retract the screen, and obtaining the flip angle of the flip display screen.

[0039] Among them, the flip display screen is a flip and foldable display screen set on the smart kitchenware; the smart kitchenware can be but not limited to a dishwasher. It should be noted that after receiving the flip control instruction, the flip display screen will control the flip motor to perform corresponding operations according to the flip control instruction. Among them, the flip control instruction can be but not limited to being input by the user through voice, touch buttons, physical buttons, etc., and no specific limitation is made here; the flip control instruction includes a screen flipping instruction and a screen retracting instruction; when the flip control instruction is a screen retracting instruction, the flip display screen is controlled by the flip motor to retract the screen; when the flip control instruction is a screen flipping instruction, the flip display screen is controlled by the flip motor to flip the screen outward.

[0040] Among them, the flip motor is used to control the flip display screen to perform corresponding flipping. For example, when the flip motor runs forward, the flip display screen is controlled to flip outward; when the flip motor runs reverse, the flip display screen is controlled to retract.

[0041] The flip angle is the angle between the flip display and the display slot. Figure 2 , taking a dishwasher as an example, the flip display screen 100 is arranged at the display screen slot 210 corresponding to the door body 200 of the dishwasher, and the flip angle is the angle between the flip display screen 100 and the display screen slot 210. It should be noted that the flip angle can be determined based on, but not limited to, detection devices or equipment such as micro switches, angle measurement sensors, motor encoders, and servo motors, and is not specifically limited here.

[0042] Exemplarily, taking the example of the flip motor reversely running to control the flip display screen to retract the screen, when the flip motor reverses running, the flip display screen is controlled to retract the screen so that the flip display screen is stored in the corresponding display screen slot; in the process of the flip motor controlling the flip display screen to retract the screen, the flip angle of the flip display screen is obtained in real time, that is, the angle between the flip display screen and the display screen slot is obtained in real time to determine whether the flip angle is within the angle range with risk of pinching hands.

[0043] Step S102: if the flip angle is within the angle range where there is a risk of pinching the finger, the operating current of the flip motor is obtained.

[0044] Among them, the finger pinching risk angle range refers to the flip angle range corresponding to the flip display screen when there is a finger pinching risk. It is understandable that when the flip angle is in the finger pinching risk angle range, there may be a situation where the user's fingers or other external objects are stuck in the retraction path of the flip display screen. It should be noted that the finger pinching risk angle range needs to be set according to the actual anti-pinch control requirements and is not specifically limited here.

[0045] The operating current refers to the current when the flip motor is running. It should be noted that the operating current can be, but is not limited to, determined by real-time acquisition or detection by a signal acquisition module set inside the flip display screen, and is not specifically limited here. For example, when the flip motor is running, the operating current corresponding to the flip motor can be obtained in real time through the sensor module set inside the flip display screen.

[0046] Illustratively, during the process of retracting the flip display screen, the flip angle of the flip display screen is obtained in real time, and a determination is made as to whether the flip angle is within the angle range where there is a risk of pinching the finger; if the flip angle is within the angle range where there is a risk of pinching the finger, the operating current of the flip motor is obtained in real time to determine whether anti-pinch control is needed based on the state of the operating current.

[0047] Step S103: if the operating current has an increasing trend, then reduce the duty cycle of the driving signal corresponding to the flip motor.

[0048] It should be noted that when there is a risk of pinching fingers, the operating current of the flip motor will have a corresponding current change trend; wherein, the current change trend refers to the direction of the operating current changing over time; it should be noted that the current change trend includes an increasing trend; illustratively, taking an external object stuck in the retraction path of the flip display screen as an example, when the flip display screen is retracted, if there is an external object stuck in the retraction path of the flip display screen, as the force between the flip display screen and the external object gradually increases, the operating current of the flip motor will also gradually increase, that is, the operating current has an increasing trend.

[0049] Among them, the driving signal can be, but is not limited to, a pulse width modulation signal, which is used to control the flip motor to perform corresponding work; adjusting the duty cycle of the driving signal can control the operating speed of the flip motor; it is understandable that after receiving the flip control instruction, the flip display screen will generate a corresponding driving signal according to the flip control instruction, so as to control the flip motor to perform corresponding operation through the driving signal. It should be noted that the flip control instruction can be, but is not limited to, input by the user through voice, touch buttons, physical buttons, etc., and is not specifically limited here.

[0050] It should be noted that the larger the duty cycle of the driving signal corresponding to the flip motor, the faster the corresponding running speed of the flip motor; the smaller the duty cycle of the driving signal corresponding to the flip motor, the lower the corresponding running speed of the flip motor; therefore, when the motion current tends to increase, it indicates that the flip motor may be stuck, that is, there may be a situation where the hand is pinched or the external object is stuck in the retraction path of the flip display screen. At this time, it is necessary to reduce the duty cycle of the driving signal corresponding to the flip motor to reduce the running speed of the flip motor, thereby reducing the force between the flip display screen and the finger or external object, and improving the safety of the flip display screen.

[0051] In the present embodiment, during the process of the flip motor controlling the flip display screen to retract the screen, by acquiring the flip angle of the flip display screen in real time, it is possible to accurately determine whether the flip angle is within the angle range with the risk of pinching the fingers; if the flip angle is within the angle range with the risk of pinching the fingers, the operating current of the flip motor is acquired in real time, and by the circuit change trend of the operating current, it is possible to accurately determine whether there is a pinching situation; when the operating current has an increasing trend, the duty cycle of the corresponding drive signal of the flip motor is timely reduced to reduce the force between the flip display screen and the fingers, thereby reducing the pain of pinching the fingers, thereby effectively improving the safety of the flip display screen and the user experience.

[0052] In one embodiment, the anti-pinch control method for a flip display screen further includes:

[0053] If the operating current is greater than or equal to the preset current threshold, the display screen is flipped outward by controlling the flip motor.

[0054] The preset current threshold needs to be set according to the stall current when the flip motor is stalled, and is not specifically limited here. For example, assuming that the stall current corresponding to the just stalled flip motor is 180A, the preset current threshold can be set to 180A.

[0055] Exemplarily, if the operating current has an increasing trend, the duty cycle of the drive signal corresponding to the flip motor is reduced, and it is determined whether the operating current is greater than or equal to a preset current threshold; if the operating current is greater than or equal to the preset current threshold, the flip motor is used to control the flip display screen to flip the screen outward, so as to timely reduce the force between the flip display screen and the fingers, thereby realizing anti-pinch control.

[0056] In this embodiment, when the operating current is greater than or equal to the preset current threshold, the flip display screen is flipped outward by controlling the flip motor, which can timely reduce the force between the flip display screen and the finger, further improving the safety of the flip display screen.

[0057] In one embodiment, Figure 3 As shown, Figure 3 The figure is a flow chart of the steps of reducing the duty cycle of the driving signal corresponding to the flip motor in one embodiment; if the operating current has an increasing trend, reducing the duty cycle of the driving signal corresponding to the flip motor includes the following steps:

[0058] Step S301: detecting a plurality of operating currents corresponding to a plurality of consecutive moments at a preset time interval.

[0059] Among them, the preset time interval needs to be set according to the actual detection requirements of the operating current of the flip motor, and is not specifically limited here.

[0060] Exemplarily, assuming that the preset time interval is 500ms, multiple operating currents corresponding to multiple consecutive moments are detected with a time interval of 500ms; it can be understood that the operating current corresponding to the flip motor is detected in real time with a detection period of 500ms.

[0061] Step S302: determining a current variation trend based on multiple operating currents.

[0062] Among them, the current change trend refers to the direction of the operating current changing over time; it should be noted that the current change trend includes an increasing trend and a decreasing trend; in an exemplary embodiment, taking the case of a pinched finger as an example, during the retraction of the flip display screen, if a user's finger is stuck in the retraction path of the flip display screen, as the force between the flip display screen and the finger gradually increases, the operating current of the flip motor will also gradually increase. In this case, at a preset time interval, multiple operating currents corresponding to multiple consecutive moments are detected, and based on the multiple operating currents, it can be determined that the current change trend is an increasing trend; if the user takes out the finger in the middle, the force between the flip display screen and the finger disappears, and the operating current of the flip motor gradually decreases. In this case, at a preset time interval, multiple operating currents corresponding to multiple consecutive moments are detected, and based on the multiple operating currents, it can be determined that the current change trend is a decreasing trend. It should be noted that if there is no current change trend, it means that no safety hazards are found during the retraction of the flip display screen, and it can be retracted normally.

[0063] Step S303: if the current variation trend is an increasing trend, then the duty cycle of the driving signal corresponding to the flip motor is reduced.

[0064] Exemplarily, with a preset time interval as a period, multiple operating currents corresponding to multiple consecutive moments are detected, and based on the multiple operating currents, the current change trend is determined; if the current change trend is an increasing trend, the duty cycle of the driving signal corresponding to the flip motor is reduced to reduce the operating speed of the flip motor; optionally, further, the operating current of the flip motor can be detected in real time, and when the operating current of the flip motor is greater than or equal to the preset current threshold, the flip motor is used to control the flip display screen to flip the screen outward to further ensure the safety of the flip display screen.

[0065] In this embodiment, based on a preset time interval, multiple operating currents corresponding to multiple consecutive moments are detected in real time, and then based on the multiple operating currents, the current change trend can be accurately determined. If the current change trend is an increasing trend, the duty cycle of the driving signal corresponding to the flip motor is reduced to reduce the operating speed of the flip motor. Based on this, the safety risk can be effectively reduced and the safety of the flip display screen during flipping is improved.

[0066] In one embodiment, if the current variation trend is an increasing trend, reducing the duty cycle of the driving signal corresponding to the flip motor includes the following steps:

[0067] Step 1: If the current change trend is an increasing trend, the operating current at the current moment and a preset mapping relationship are obtained; the preset mapping relationship is a mapping relationship between the operating current-duty cycle-preset current threshold.

[0068] Step 2: according to the current operating current and the preset mapping relationship, reduce the duty cycle of the driving signal corresponding to the flip motor.

[0069] Preferably, the preset current threshold is updated according to the current operating current and the preset mapping relationship.

[0070] Among them, the preset mapping relationship is the mapping relationship between the operating current-duty cycle-preset current threshold, which needs to be set according to the operating current of the flip motor, the duty cycle of the drive signal and the preset current threshold, and is not specifically limited here.

[0071] Exemplarily, as shown in Table 1, assuming that the rated operating current range of the flipping motor is 100A-110A, the corresponding stall current when the flipping motor stalls is 180A; assuming that the operating current of the flipping motor during normal operation is 100A, the duty cycle of the drive signal corresponding to the flipping motor is 100%, and the preset current threshold is 180A; based on multiple operating currents, determine the current change trend; if the current change trend is an increasing trend, obtain the operating current at the current moment and the preset mapping relationship. If the operating current at the current moment is 115A, adjust the duty cycle of the drive signal corresponding to the flipping motor to 90% according to the preset mapping relationship and the operating current at the current moment to reduce the operating speed of the flipping motor. It can be understood that after the duty cycle of the drive signal corresponding to the flipping motor is reduced, the operating current of the flipping motor is also reduced accordingly.

[0072] Optionally, the preset current threshold can be further updated to 162A according to the preset mapping relationship. Similarly, based on the preset mapping relationship, the duty cycle of the driving signal corresponding to the flip motor and the preset current threshold can be dynamically adjusted to lay the foundation for improving the safety of the flip display screen.

[0073] Table 1 Mapping relationship between operating current, duty cycle and preset current threshold

[0074]

[0075] In this embodiment, based on multiple operating currents, when the current change trend is an increasing trend, based on the current operating current at the current moment and the preset mapping relationship, the duty cycle of the drive signal is reduced, thereby reducing the operating speed of the flip motor. Based on this, the potential safety hazard of the flip display screen during the retraction process can be effectively avoided, further improving the safety and reliability of the flip display screen. At the same time, according to the current operating current and the preset mapping relationship, the preset current threshold is updated, and the preset current threshold can be dynamically adjusted, laying a foundation for improving the safety of the flip display screen.

[0076] In one embodiment, the anti-pinch control method for a flip display screen further includes:

[0077] If the current variation trend is a decreasing trend, the duty cycle of the driving signal corresponding to the flip motor is increased.

[0078] Exemplarily, taking the case of a finger being caught as an example, during the retraction process of the flip display screen, if a user's finger is stuck in the retraction path of the flip display screen, as the force between the flip display screen and the finger gradually increases, the operating current of the flip motor will also gradually increase. In this case, at a preset time interval, multiple operating currents corresponding to multiple consecutive moments are detected. Based on the multiple operating currents, it can be determined that the current change trend is an increasing trend. At this time, the duty cycle of the corresponding drive signal of the flip motor is reduced to control the flip motor to reduce the operating speed and reduce the safety risk; if the user takes out the finger in the middle, the force between the flip display screen and the finger disappears, and the operating current of the flip motor gradually decreases. In this case, at a preset time interval, multiple operating currents corresponding to multiple consecutive moments are detected. Based on the multiple operating currents, it can be determined that the current change trend is a decreasing trend. At this time, the duty cycle of the corresponding drive signal of the flip motor is increased, and the operating speed of the flip motor is restored, so that the flip motor controls the flip display screen to retract normally until the flip display screen is retracted into place.

[0079] Preferably, if the current variation trend is a decreasing trend, increasing the duty cycle of the driving signal corresponding to the flip motor includes the following steps:

[0080] Step 1: If the current change trend is a decreasing trend, the current operating current and the preset mapping relationship are obtained.

[0081] The preset mapping relationship is a mapping relationship between operating current-duty cycle-preset current threshold.

[0082] Step 2: According to the current operating current and the preset mapping relationship, the duty cycle of the driving signal corresponding to the flip motor is increased.

[0083] Exemplarily, as shown in Table 1, if the current change trend is a decreasing trend, the operating current at the current moment and the preset mapping relationship are obtained. If the operating current at the current moment is 100A, the duty cycle of the drive signal corresponding to the flip motor is increased to 100% according to the preset mapping relationship and the operating current at the current moment, and the operating speed of the flip motor is restored so that the flip motor controls the flip display screen to retract normally until the flip display screen is retracted into place. Optionally, the preset current threshold value can be further updated to 180A according to the preset mapping relationship, and so on. Based on the preset mapping relationship, the duty cycle of the drive signal corresponding to the flip motor and the preset current threshold value are dynamically adjusted, which lays a foundation for improving the safety of the flip display screen.

[0084] In this embodiment, when the current change trend is a decreasing trend, based on the current operating current and the preset mapping relationship, the duty cycle of the drive signal is increased to restore the operating speed of the flip motor to control the normal retraction of the flip display screen, thereby further improving the reliability of the flip display screen.

[0085] In one embodiment, the anti-pinch control method for a flip display screen further includes:

[0086] Step 1: If the flip angle is within the angle range without the risk of pinching fingers, the operating current of the flip motor is obtained.

[0087] Among them, the no-pinch risk angle range refers to the flip angle range corresponding to the flip display screen when there is no pinch risk; it can be understood that when the flip angle is in the no-pinch risk angle range, there is no situation where the user's fingers or other external objects are stuck in the retraction path of the flip display screen. It should be noted that the no-pinch risk angle range needs to be set according to the actual anti-pinch control requirements and is not specifically limited here.

[0088] Step 2: If the running current is greater than or equal to the preset current threshold for a continuous preset time, it is determined that the flip display screen is retracted into place.

[0089] The preset time needs to be set according to the performance of the flip motor, and is not specifically limited here. It should be noted that the preset time needs to be set to ensure that the flip motor will not be damaged due to the continuous increase of the stall current when the flip display screen is retracted into place.

[0090] Exemplarily, during the process of retracting the flip display screen controlled by the flip motor, if the flip angle is within the angle range without the risk of pinching fingers, the operating current of the flip motor is obtained in real time; if the operating current of the flip motor is less than the preset current threshold, it indicates that the flip display screen is in the process of retraction; if the operating current of the flip motor is greater than or equal to the preset current threshold for a continuous preset time, it is determined that the flip display screen is retracted into place.

[0091] It should be noted that when the flip display screen is retracted into place, the flip display screen can automatically stop the flip motor to avoid the problem of the flip motor running for a long time causing a safety risk to the flip display screen.

[0092] In this embodiment, when the flip angle is within the angle range without the risk of pinching fingers, based on the preset time and the preset current threshold, if the running current is greater than or equal to the preset current threshold for the continuous preset time, it can be determined that the flip display screen is retracted into place. Based on this, it is possible to accurately determine whether the flip display screen is in the retraction process or whether it is retracted into place, thereby improving the reliability of the flip display screen.

[0093] In one embodiment, the anti-pinch control method for a flip display screen further includes the following steps:

[0094] Step 1: Control the flip display screen by flipping the motor to flip the screen outward, and obtain the operating current of the flip motor.

[0095] Step 2: If the running current is greater than or equal to the preset current threshold for a continuous preset time, it is determined that the flip display screen is fully flipped outward.

[0096] Exemplarily, taking the example of the flip motor running forward to control the flip display screen to flip outward, when the flip motor runs forward, the flip display screen is controlled to flip outward, so that the flip display screen is opened from the inside to the outside from the display screen slot that accommodates it. At this time, the operating current of the flip motor is obtained in real time; if the operating current is less than the preset current threshold, it indicates that the flip display screen is in the process of flipping outward; if the operating current is greater than or equal to the preset current threshold for a continuous preset time, it is determined that the flip display screen is flipped out to the full extent.

[0097] In this embodiment, when the flip display screen is flipped outward, based on the preset time and the preset current threshold, if the running current is greater than or equal to the preset current threshold for the continuous preset time, it can be determined that the flip display screen is flipped outward to the full extent. Based on this, it is possible to accurately determine whether the flip display screen is in the process of flipping outward or whether it is flipped outward to the full extent, thereby improving the reliability of the flip display screen.

[0098] In one embodiment, the flip angle of the flip display screen has a critical flip angle;

[0099] The angle range between the critical flip angle and the retraction of the flip display screen is the angle range without the risk of pinching the hand;

[0100] The angle range of the flip display screen from the critical flip angle to the flip display screen being fully flipped outward is the angle range with the risk of pinching the hand.

[0101] Preferably, when the flip display screen is completely stored in the display screen slot, the flip angle of the flip display screen is 0 degrees, and the critical flip angle satisfies the following formula (1):

[0102] (1)

[0103] in, is the critical flip angle, h is the thickness of the flip display screen, w is the gap width between the bottom edge of the flip display screen and the display screen slot, w=0~8mm, r is the distance from the bottom edge of the flip display screen to its rotation axis (i.e., the rotation radius of the bottom edge of the flip display screen); the units of h, w, and r are mm. The unit is degree. It should be noted that the gap width w needs to be taken downward with reference to the finger width threshold. A smaller value is safer, but requires a higher accuracy in the angle control of the flip motor. The width threshold is determined based on the normal width range of human fingers and is not specifically limited here. The critical flip angle determined by formula (1) can ensure that objects with a thickness greater than w cannot be inserted into the gap between the flip display and the bottom edge of the display slot that accommodates it (the gaps on both sides are usually smaller). Selecting a smaller w value can ensure that fingers cannot be inserted into the gap, ensuring that the gap is between 0 and No risk of pinching fingers between angles.

[0104] It should be noted that the flip angle can be, but is not limited to, determined based on detection devices or equipment such as angle measurement sensors, motor encoders, servo motors, micro switches, etc., and is not specifically limited here.

[0105] Specifically, if the flip display screen is completely stored in the display screen slot, the flip angle of the flip display screen is 0 degrees, then based on the thickness h of the flip display screen, the gap width w between the bottom edge of the flip display screen and the display screen slot, and the distance r from the bottom edge of the flip display screen to its rotation axis, the critical flip angle corresponding to the flip display screen can be determined. ; Further, according to the critical flip angle of the flip display The angle range from when the flip display screen is retracted to when it is fully retracted can determine the angle range without the risk of pinching the hand; The angle range between when the flip display screen is turned outward and when it is fully rotated can determine the angle range with the risk of pinching the finger; based on this, the foundation is laid for improving the safety of the flip display screen.

[0106] In this embodiment, based on the critical flip angle, the angle range without the risk of pinching fingers and the angle range with the risk of pinching fingers can be accurately determined, which lays a foundation for improving the safety of the flip display screen.

[0107] In one embodiment, when the flip display screen is in a non-pinch risk angle range, the gap width between the flip display screen and any side of the display screen slot that accommodates it is less than or equal to a width threshold determined based on a conventional width range of human fingers.

[0108] Optionally, when one of the sides of the flip display screen is used as the rotation axis, any side of the flip display screen and the display screen slot that accommodates it can be any side except the side corresponding to the rotation axis. For example, when the upper side of the flip display screen is used as the rotation axis, any side of the flip display screen and the display screen slot that accommodates it can be the bottom, left or right side.

[0109] The gap width may be the straight-line distance between the edge of the flip display screen and the corresponding edge of the display screen slot that receives it. The width threshold is determined based on the conventional width range of human fingers; for example, assuming that the width of a human finger is 18 mm, the width threshold may be set to 18 mm.

[0110] In the present embodiment, when the flip display screen is in the angle range without the risk of pinching fingers, it is ensured that the gap width between the flip display screen and any side of the display screen slot that accommodates it is less than or equal to a width threshold determined based on the conventional width range of human fingers. Based on this, during the retraction process of the flip display screen, it is possible to ensure that the flip display screen is controlled to be retracted into place while completely eliminating the risk of pinching fingers.

[0111] In one embodiment, the flip display screen is provided with a micro switch for determining the angle interval of the flip display screen, and obtaining the flip angle of the flip display screen includes:

[0112] Get the switch status of the micro switch;

[0113] If the switch is in the off state, the flip angle is in the angle range where there is a risk of pinching the finger;

[0114] If the switch is in the closed state, the flip angle is within the angle range where there is no risk of pinching the finger.

[0115] It should be noted that by providing a micro switch on the flip display screen for determining the angle range of the flip display screen, the risk of pinching the hand during the retraction process of the flip display screen can be avoided according to the switch state of the micro switch. Figure 2 The micro switch can be, but is not limited to, set at any position in the display screen slot 210, or at any position where the flip display screen 100 and the display screen slot 210 can contact each other, and no specific limitation is made here.

[0116] Exemplarily, when the flip motor controls the flip display screen to retract, if the gap width between the flip display screen 100 and the display screen slot 210 is less than or equal to the preset gap, the micro switch detects that the flip display screen 100 and the display screen slot 210 are closed to each other, at which time the micro switch is in a closed state, and the flip angle is in an angle range without the risk of pinching fingers; if the gap between the flip display screen 100 and the display screen slot 210 is greater than the preset gap, the micro switch detects that the flip display screen 100 and the display screen slot 210 are not closed, at which time the micro switch is in an open state, and the flip angle is in an angle range with the risk of pinching fingers; wherein the preset gap needs to be set according to the setting position of the micro switch, and is not specifically limited here.

[0117] In this embodiment, based on the switch state of the micro switch, it can be accurately and reliably determined whether the flip angle is in the angle range with finger pinching risk or the angle range without finger pinching risk, which lays a foundation for improving the safety and reliability of the flip display screen.

[0118] In a specific embodiment, see Figure 4 , taking the anti-pinch finger control method of the flip display screen applied to a dishwasher as an example for explanation, specifically comprising the following steps:

[0119] Step S401, controlling the flipping motor to flip the display screen to retract the screen.

[0120] Step S402, obtaining the switch state of the micro switch.

[0121] Step S403, determine whether the micro switch is in the off state. If yes, execute step S406; if no, execute step S404.

[0122] Step S404: When the flip angle is within the angle range without the risk of pinching fingers, the operating current of the flip motor is obtained.

[0123] Step S405: if the running current is greater than or equal to the preset current threshold value for a continuous preset time, it is determined that the flip display screen is retracted into place.

[0124] Step S406, when the flip angle is within the angle interval where there is a risk of pinching the finger, the operating current of the flip motor is obtained.

[0125] Step S407: detecting a plurality of operating currents corresponding to a plurality of consecutive moments at preset time intervals, and determining a current variation trend based on the plurality of operating currents.

[0126] Step S408, determining whether the current change trend is an increasing trend.

[0127] If yes, go to step S409; if no, go to step S411.

[0128] Step S409: if the current variation trend is an increasing trend, then reducing the duty cycle of the driving signal corresponding to the flip motor.

[0129] Step S410: If the operating current is greater than or equal to the preset current threshold, the display screen is flipped outward by controlling the flip motor.

[0130] Step S411: if the current variation trend is a decreasing trend, then the duty cycle of the driving signal corresponding to the flip motor is increased.

[0131] After step S411 is completed, the process jumps to step S403.

[0132] In some other embodiments, the anti-pinch control method for a flip display screen further includes the following steps:

[0133] Step 1, obtain the running time of the flip motor.

[0134] Step 2: If the running time is less than the preset running time, and the running current is greater than or equal to the preset current threshold for the continuous preset time, it is determined that the dishwasher display screen is flipped into place.

[0135] The preset running time needs to be set according to the actual flipping stroke and the actual flipping speed of the flip display screen, and is not specifically limited here. For example, if the actual flipping stroke takes 4 seconds, the preset running time can be set to 10 seconds.

[0136] Exemplarily, when the flip motor controls the flip display screen to flip outward, the operating time and operating current of the flip motor are obtained in real time; if the operating time of the flip motor is less than the preset operating time, and the operating current of the flip motor is less than the preset current threshold, it indicates that the flip display screen is in the process of flipping outward; if the operating time of the flip motor is less than the preset operating time, and the operating current of the flip motor is greater than or equal to the preset current threshold for a continuous preset time, it is determined that the flip display screen is flipped outward in place; if the operating time of the flip motor is greater than or equal to the preset operating time, and it is not detected that the operating current of the flip motor is greater than or equal to the preset current threshold for a continuous preset time, it indicates that an abnormal fault has occurred in the flip display screen, and the fault information needs to be reported at this time; for example, a fault code E9 is generated on the display interface of the flip display screen to prompt the user that the flip display screen is abnormal.

[0137] When the flip motor controls the flip display screen to retract the screen, the operating time and operating current of the flip motor are obtained in real time; if the operating time of the flip motor is less than the preset operating time, and the operating current of the flip motor is less than the preset current threshold, it indicates that the flip display screen is in the retraction process; if the operating time of the flip motor is less than the preset operating time, and the operating current of the flip motor is greater than or equal to the preset current threshold for a continuous preset time, it is determined that the flip display screen is retracted into place; if the operating time of the flip motor is greater than or equal to the preset operating time, and it is not detected that the operating current of the flip motor is greater than or equal to the preset current threshold for a continuous preset time, it indicates that an abnormal fault has occurred in the flip display screen, and the fault information needs to be reported at this time to prompt the user that the flip display screen is abnormal.

[0138] It should be noted that when the flip display screen is flipped into place or an abnormal failure occurs in the flip display screen, the flip display screen can automatically stop the flip motor to avoid the problem of safety risks of the flip display screen caused by the flip motor running for a long time.

[0139] The above-mentioned anti-pinch control method for the flip display screen, on the one hand, during the process of the flip motor controlling the flip display screen to retract the screen, by obtaining the flip angle of the flip display screen in real time, it is possible to accurately determine whether the flip angle is in the angle range with the risk of pinching the finger; if the flip angle is in the angle range with the risk of pinching the finger, the operating current of the flip motor is obtained in real time, and the circuit change trend of the operating current can be used to accurately determine whether there is a pinching situation; when the operating current has an increasing trend, the duty cycle of the corresponding drive signal of the flip motor is timely reduced to reduce the force between the flip display screen and the finger, thereby reducing the pain of pinching the finger, and thus effectively improving the safety of the flip display screen and the user experience. On the other hand, when the operating current is greater than or equal to the preset current threshold, the flip motor is used to control the flip display screen to flip the screen outward, so that the force between the flip display screen and the finger can be reduced in time, further improving the safety of the flip display screen. In the third aspect, based on the preset time interval, multiple operating currents corresponding to multiple consecutive moments are detected in real time, and then based on the multiple operating currents, the current change trend can be accurately determined. According to the current change trend, the duty cycle of the driving signal corresponding to the flip motor is adjusted to adjust the operating speed of the flip motor. Based on this, the safety risk can be effectively reduced and the safety of the flip display screen during flipping can be improved. In the fourth aspect, based on the operating current at the current moment and the preset mapping relationship, the duty cycle of the driving signal is adjusted, and then the operating speed of the flip motor is adjusted. Based on this, the safety hazard problem of the flip display screen during the retraction process can be effectively avoided, and the safety and reliability of the flip display screen can be further improved. At the same time, according to the operating current at the current moment and the preset mapping relationship, the preset current threshold is updated, and the preset current threshold can be dynamically adjusted, which lays the foundation for improving the safety of the flip display screen. In the fifth aspect, based on the preset time and the preset current threshold, if the operating current is greater than or equal to the preset current threshold for the continuous preset time, it can be determined that the flip display screen is flipped in place. Based on this, it can be accurately determined whether the flip display screen is in the flipping process or whether it is flipped in place, which improves the reliability of the flip display screen. Sixthly, based on the critical flip angle, the angle range without risk of pinching fingers and the angle range with risk of pinching fingers can be accurately determined, laying a foundation for improving the safety of the flip display screen. Seventhly, based on the switch state of the micro switch, it can be accurately and reliably determined whether the flip angle is in the angle range with risk of pinching fingers or the angle range without risk of pinching fingers, laying a foundation for improving the safety and reliability of the flip display screen.

[0140] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0141] Based on the same inventive concept, the embodiment of the present application also provides a flip display screen anti-pinch control device for implementing the flip display screen anti-pinch control method involved in the above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in the embodiments of one or more flip display screen anti-pinch control devices provided below can refer to the limitations of the flip display screen anti-pinch control method above, and will not be repeated here.

[0142] In one embodiment, Figure 5 As shown, Figure 5 1 is a structural block diagram of a finger pinch prevention control device for a flip display screen in one embodiment; the finger pinch prevention control device for a flip display screen comprises: an angle acquisition module 501, a current acquisition module 502 and a duty cycle adjustment module 503;

[0143] Angle acquisition module 501, used to control the flip display screen to retract the screen through the flip motor, and obtain the flip angle of the flip display screen;

[0144] The current acquisition module 502 is used to acquire the operating current of the flip motor if the flip angle is within the finger pinching risk angle range;

[0145] The duty cycle adjustment module 503 is used to reduce the duty cycle of the driving signal corresponding to the flip motor if the operating current has an increasing trend.

[0146] In one embodiment, the anti-pinch control device for the flip display screen further includes an outward turning control module;

[0147] The flip control module is used to control the flipping of the display screen through the flip motor to flip the screen outward if the operating current is greater than or equal to a preset current threshold.

[0148] In one embodiment, the duty cycle adjustment module 503 is also used to detect multiple operating currents corresponding to multiple consecutive moments at preset time intervals; determine the current change trend based on the multiple operating currents; if the current change trend is an increasing trend, reduce the duty cycle of the corresponding drive signal of the flipping motor.

[0149] In one embodiment, the duty cycle adjustment module 503 is also used to obtain the operating current at the current moment and a preset mapping relationship if the current change trend is an increasing trend; the preset mapping relationship is a mapping relationship between the operating current-duty cycle-preset current threshold; according to the operating current at the current moment and the preset mapping relationship, reduce the duty cycle of the driving signal corresponding to the flipping motor.

[0150] In one embodiment, the duty cycle adjustment module 503 is further configured to increase the duty cycle of the driving signal corresponding to the flip motor if the current variation trend is a decreasing trend.

[0151] In one embodiment, the duty cycle adjustment module 503 is also used to obtain the operating current at the current moment and a preset mapping relationship if the current change trend is a decreasing trend; the preset mapping relationship is a mapping relationship between the operating current-duty cycle-preset current threshold; according to the operating current at the current moment and the preset mapping relationship, the duty cycle of the corresponding drive signal of the flipping motor is increased.

[0152] In one embodiment, the duty cycle adjustment module 503 is further configured to update the preset current threshold value according to the current operating current and the preset mapping relationship.

[0153] In one embodiment, the anti-pinch control device for the flip display screen also includes: a flipping position determination module; the flipping position determination module is used to obtain the operating current of the flip motor if the flip angle is within the angle range without the risk of pinching the finger; if the operating current is greater than or equal to the preset current threshold for a continuous preset time, it is determined that the flip display screen is retracted into place.

[0154] In one embodiment, the flipping position determination module is also used to control the flipping display screen to flip outward through the flipping motor, and obtain the operating current of the flipping motor; if the operating current is greater than or equal to the preset current threshold for a continuous preset time, it is determined that the flipping display screen is flipped outward into position.

[0155] In one embodiment, the flip angle of the flip display screen has a critical flip angle; the angle range of the flip display screen from the critical flip angle to the flip display screen being retracted into place is a risk-free angle range; the angle range of the flip display screen from the critical flip angle to the flip display screen being turned outward into place is a risk-free angle range.

[0156] In one embodiment, when the flip display screen is in a non-pinch risk angle range, the gap width between the flip display screen and any side of the display screen slot that accommodates it is less than or equal to a width threshold determined based on a conventional width range of human fingers.

[0157] In one embodiment, if the flip display screen is completely stored in the display screen slot, the flip angle of the flip display screen is 0 degrees, and the critical flip angle satisfies the following formula:

[0158]

[0159] Wherein, h is the thickness of the flip display screen, w is the gap width between the bottom edge of the flip display screen and the display screen slot, w=0~8mm, r is the distance from the bottom edge of the flip display screen to its rotation axis, and the units of h, w, and r are mm. The unit is degree.

[0160] In one embodiment, the flip display screen is provided with a micro switch for determining the angle range in which the flip display screen is located. The angle acquisition module 301 is also used to obtain the switch state of the micro switch; if the switch state is in an open state, the flip angle is in an angle range with a risk of pinching the finger; if the switch state is in a closed state, the flip angle is in an angle range without a risk of pinching the finger.

[0161] Each module in the anti-pinch control device for the flip display screen can be implemented in whole or in part by software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0162] In one embodiment, a dishwasher is provided. The dishwasher may include a server, and its internal structure diagram may be as follows: Figure 6 As shown. The dishwasher includes a processor, a memory and a network interface connected through a system bus. Among them, the processor of the dishwasher is used to provide computing and control capabilities. The memory of the dishwasher includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the dishwasher is used to store data related to the anti-pinch control of the flip display screen. The network interface of the dishwasher is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for anti-pinch control of a flip display screen is implemented.

[0163] Those skilled in the art will understand that Figure 6The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the dishwasher to which the solution of the present application is applied. The specific dishwasher may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0164] In one embodiment, a dishwasher is provided, including a door body, on which a flip display screen is provided, the dishwasher includes a memory and a processor, the memory stores a computer program, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0165] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0166] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0167] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0168] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0169] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A finger pinch prevention control method for a flip display screen, characterized in that: The method comprises: The flip display screen is controlled by a flip motor to retract the screen, and the flip angle of the flip display screen is obtained; If the flip angle is within the angle range with risk of pinching fingers, the operating current of the flip motor is obtained; If the operating current has an increasing trend, reducing the duty cycle of the driving signal corresponding to the flip motor; If the running current has an increasing trend, reducing the duty cycle of the driving signal corresponding to the flip motor includes: Detecting multiple operating currents corresponding to multiple consecutive moments at preset time intervals; Based on the multiple operating currents, determining a current change trend; the current change trend refers to the direction of the operating current changing over time; If the current change trend is an increasing trend, reducing the duty cycle of the driving signal corresponding to the flip motor; If the current change trend is a decreasing trend, increasing the duty cycle of the driving signal corresponding to the flip motor; If the current change trend is a decreasing trend, increasing the duty cycle of the driving signal corresponding to the flip motor includes: If the current change trend is a decreasing trend, the operating current at the current moment and a preset mapping relationship are obtained; the preset mapping relationship is a mapping relationship between the operating current-duty cycle-preset current threshold; According to the current operating current and the preset mapping relationship, the duty cycle of the driving signal corresponding to the flip motor is increased.

2. The method according to claim 1, characterized in that The method further comprises: If the operating current is greater than or equal to a preset current threshold, the flip display screen is controlled by a flip motor to flip the screen outward.

3. The method according to claim 1, characterized in that If the current change trend is an increasing trend, reducing the duty cycle of the driving signal corresponding to the flip motor includes: If the current change trend is an increasing trend, the operating current at the current moment and a preset mapping relationship are obtained; the preset mapping relationship is a mapping relationship between the operating current-duty cycle-preset current threshold; According to the current operating current and the preset mapping relationship, the duty cycle of the driving signal corresponding to the flip motor is reduced.

4. The method according to claim 1 or claim 3, characterized in that: The preset current threshold is updated according to the current running current and the preset mapping relationship.

5. The method according to claim 1, characterized in that: The method further comprises: If the flip angle is within the angle range without risk of pinching fingers, the operating current of the flip motor is obtained; If the operating current is greater than or equal to a preset current threshold for a continuous preset time, it is determined that the flip display screen is retracted into place.

6. The method according to claim 1, characterized in that The method further comprises: Controlling the flip display screen to flip outwards through a flip motor, and obtaining the operating current of the flip motor; If the operating current is greater than or equal to the preset current threshold for a continuous preset time, it is determined that the flip display screen is flipped outwardly into place.

7. The method according to claim 1, characterized in that The flip angle of the flip display screen has a critical flip angle; The angle range of the flip display screen from the critical flip angle to the flip display screen being retracted into place is the angle range without the risk of pinching the hand; The angle range of the flip display screen from the critical flip angle to the flip display screen being fully flipped outward is the angle range with the risk of pinching the hand.

8. The method according to claim 7, characterized in that When the flip display screen is in an angle range without the risk of pinching fingers, the gap width between the flip display screen and any side of the display screen slot accommodating the flip display screen is less than or equal to a width threshold determined based on a conventional width range of human fingers.

9. The method according to claim 8, characterized in that If the flip display screen is completely stored in the display screen slot, the flip angle of the flip display screen is 0 degrees, then the critical flip angle satisfies the following formula: Wherein, h is the thickness of the flip display screen, w is the gap width between the bottom edge of the flip display screen and the display screen slot, w=0~8mm, r is the distance from the bottom edge of the flip display screen to its rotation axis, and the units of h, w, and r are mm. The unit is degree.

10. The method according to claim 1, characterized in that The flip display screen is provided with a micro switch for determining the angle interval of the flip display screen, and obtaining the flip angle of the flip display screen includes: Get the switch status of the micro switch; If the switch state is in the off state, the flip angle is in the angle range where there is a risk of pinching the hand; If the switch state is a closed state, the flip angle is within an angle range without the risk of pinching the finger.

11. A finger pinch prevention control device for a flip display screen, characterized in that: The device comprises: An angle acquisition module, used to control the flip display screen to retract the screen through the flip motor and obtain the flip angle of the flip display screen; A current acquisition module, used for acquiring the operating current of the flip motor if the flip angle is within the finger-pinching risk angle interval; A duty cycle adjustment module, configured to reduce the duty cycle of the driving signal corresponding to the flip motor if the operating current has an increasing trend; The duty cycle adjustment module is further used to detect multiple operating currents corresponding to multiple consecutive moments at preset time intervals; Based on the multiple operating currents, determining a current change trend; the current change trend refers to the direction of the operating current changing over time; If the current change trend is an increasing trend, reducing the duty cycle of the driving signal corresponding to the flip motor; If the current change trend is a decreasing trend, increasing the duty cycle of the driving signal corresponding to the flip motor; If the current change trend is a decreasing trend, increasing the duty cycle of the driving signal corresponding to the flip motor includes: The duty cycle adjustment module is further used to obtain the operating current at the current moment and a preset mapping relationship if the current change trend is a decreasing trend; the preset mapping relationship is a mapping relationship between the operating current-duty cycle-preset current threshold; According to the current operating current and the preset mapping relationship, the duty cycle of the driving signal corresponding to the flip motor is increased.

12. A dishwasher, comprising a door body, characterized in that: The door body is provided with a flippable display screen, the dishwasher comprises a memory and a processor, the memory stores a computer program, and the processor implements the method described in any one of claims 1 to 10 when executing the computer program.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 10 is implemented.

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