Vehicle-mounted ceiling screen load model based hand detection method, device and storage medium

Abstract

The application discloses a method and device for detecting a hand clamping based on a load model of a vehicle-mounted ceiling screen and a storage medium. The method specifically comprises the following steps. Based on the load model of the ceiling screen, the damping friction and the viscous coefficient are observed in real time, and the observation values are updated and saved in real time. Based on the load model of the ceiling screen and the calibrated friction and viscous coefficient in the above step, the interference torque is observed in real time, and the observation values are updated in real time. The real-time interference torque is synchronously acquired, compared with the hand clamping protection threshold, and the hand clamping protection or shutdown operation is performed. The detection method does not need a factory calibration process, ensures the stability of hand clamping judgment, reduces the risk of hand clamping and accidental touch, does not need to additionally install an external sensor, reduces the cost, improves the universality of the use scene, and is more accurate and safer in hand clamping logic judgment under the conditions of inconsistent damping, damping force attenuation, external environmental temperature change and the like when leaving the factory.

Description

Technical Field

[0001] This invention relates to the field of hand-clamping detection technology, and in particular to a hand-clamping detection method, device and storage medium based on a load model of a vehicle-mounted ceiling screen. Background Technology

[0002] In-vehicle displays, as a crucial medium for human-machine interaction in the automotive field, are a significant manifestation of automotive intelligence. Meanwhile, in-vehicle displays such as digital instrument clusters, central control screens, and rear-seat screens are increasingly popular with users. To achieve the integration of television into vehicles while providing a better user experience, ceiling-mounted in-vehicle screens have emerged. These large-sized ceiling-mounted screens are located on the roof of the car and can be controlled by voice or buttons to adjust to a specified angle for video playback and other intelligent operations. However, when resetting a ceiling-mounted screen, there is a risk of pinching fingers, potentially causing injury to the user.

[0003] Currently, the mainstream method for detecting hand gripping is to perform the detection during the screen-off process and when the angle is less than 30°. The specific solutions are as follows: Method 1: Detect hand gripping on the display screen based on the gripping current and speed. The gripping current is derived from calibration. Method 2: External sensors (TP touch, accelerometer).

[0004] Method 1 disadvantages: Due to the characteristics of the ceiling-mounted screen's motion mechanism, the load torque varies under the influence of screen gravity at different angles; the damping holding force decreases due to aging of the active mechanism's damping material; the holding force of the damping material deviates; the holding force of the damping material changes with ambient temperature; the damping friction at different speeds; and the differences between the calibration method and the actual vehicle environment. After factory calibration of the gripping current, real-time calibration is not possible. The above factors lead to instability in gripping judgment, posing a certain risk of gripping and false triggering. Method 2 disadvantages: Increased cost; inability to trigger in some scenarios (TP cannot respond). Summary of the Invention

[0005] The main objective of this invention is to provide a method, device, and storage medium for detecting hand pinching based on a load model of a vehicle-mounted ceiling screen, aiming to solve existing technical problems.

[0006] To achieve the above objectives, this invention provides a method for detecting hand pinching based on a load model of a vehicle-mounted ceiling screen, specifically including the following steps:

[0007] Based on the load model of the ceiling screen, the damping friction force and viscosity coefficient are observed in real time, and the observed values ​​are updated and saved in real time.

[0008] Based on the ceiling-mounted screen load model and the friction and viscosity coefficients calibrated in the above steps, the disturbance torque is observed in real time, and the observed values ​​are updated and synchronized in real time.

[0009] The system acquires real-time disturbance torque and compares it with the hand-pinch protection threshold to perform hand-pinch protection or shut-off operations.

[0010] Furthermore, when the motion angle range of the ceiling-mounted screen is within 90°±10°, the damping friction force and viscosity coefficient are observed.

[0011] Furthermore, the observed values ​​of the damping friction force and viscosity coefficient need to meet the condition of being within the angular range and remaining stable. If the condition is not met, the observation should be repeated.

[0012] Furthermore, the observed values ​​of damping friction force and viscosity coefficient that meet the requirements are updated with the previous calibration values ​​and written into the MCU data area.

[0013] Furthermore, the damping friction force and viscosity coefficient are stored in the on-chip data area of ​​the MCU and are written with theoretical values ​​at the factory, and are updated in real time when the subsequent testing steps begin.

[0014] Furthermore, the interference torque observation is conducted when the ceiling-mounted screen is off and the angle is less than 80°.

[0015] Furthermore, the hand-clamping protection judgment is made when the ceiling-mounted screen is in the screen-off process and the angle is less than 30°.

[0016] An electronic device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer being configured to implement the steps of the hand-pinching detection method based on the load model of a vehicle-mounted ceiling screen as described above.

[0017] A storage medium storing a computer program, which, when executed by a processor, implements the steps of the hand-pinching detection method based on the load model of a vehicle-mounted ceiling screen as described above.

[0018] The beneficial effects of this invention are reflected in:

[0019] The detection method of this invention does not require a factory calibration process, ensuring the stability of the hand-clamping judgment and reducing the risk of hand clamping and accidental contact; it also does not require the installation of external sensors, reducing costs and increasing the versatility of its application scenarios; in addition, the damping is calibrated in real time, making the hand-clamping logic judgment more accurate and safer under conditions such as inconsistent factory damping, damping force attenuation, and changes in external ambient temperature. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the hand-clamping detection method based on the load model of a vehicle-mounted ceiling screen according to the present invention;

[0021] Figure 2 This is a schematic diagram of step one of the hand-clamping detection method based on the load model of a vehicle-mounted ceiling screen according to the present invention;

[0022] Figure 3This is a schematic diagram of step two of the method for detecting pinched fingers based on the load model of a vehicle-mounted ceiling screen in this invention;

[0023] Figure 4 This is a schematic diagram of step three of the method for detecting hand pinching based on the load model of a vehicle-mounted ceiling screen according to the present invention. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Kinematic equations of a car ceiling-mounted screen:

[0026] In the formula: T e T is the motor output torque, Rate is the speed ratio of the reducer, η is the reducer efficiency, and T is the speed output torque of the motor. l The starting friction force is damped, J is the LCM inertia, and ω is the starting friction force. m Let B be the angular velocity of the LCM, B be the damped viscous friction coefficient, G be the weight of the LCM, H be the height of the LCM, θ be the rotation angle of the LCM, and T be the rotation angle of the LCM. dis External interference forces include hand-clamping and collision interference forces.

[0027] T l The damping starting friction force and B-damping viscous friction coefficient are limited by the characteristics of the damping material, which have large factory deviations and are quite sensitive to temperature characteristics. Therefore, real-time calibration is required based on actual working conditions.

[0028] T dis The external interference quantity is the feedback of the external interference force, which, combined with the current rotating screen angle, can be used for hand-clamping logic judgment.

[0029] Please see Figure 1 This invention provides a method for detecting hand pinching based on a load model of a vehicle-mounted ceiling screen, specifically including the following steps:

[0030] S1. Based on the load model of the ceiling screen, the damping friction force and viscosity coefficient are observed in real time, and the observed values ​​are updated and saved in real time.

[0031] Please see Figure 1 and Figure 2 When the motion angle of the ceiling screen is within the range of 90°±10°, the damping friction force and viscosity coefficient are observed.

[0032] The observed values ​​of the damping friction force and viscosity coefficient need to meet the condition of stability within the angle range. If the condition is not met, the observation should be repeated.

[0033] The observed values ​​of damping friction force and viscosity coefficient that meet the requirements are updated to the previous calibration values ​​and written to the MCU data area.

[0034] Specifically, the damping friction force and viscosity coefficient were observed during the screen closing process, with the LCM angle greater than 80° and less than 100°. In the above motion angle range, the LCM was within the ±10° range of 90°. The LCM weight had a relatively small impact on the motor load, and the observed values ​​were easier to converge.

[0035] S2. Based on the ceiling-mounted screen load model and the friction and viscosity coefficients calibrated in the above steps, observe the disturbance torque in real time and update the observed values ​​in real time.

[0036] Please see Figure 1 and Figure 3 The damping friction force and viscosity coefficient are stored in the on-chip data area of ​​the MCU and are written with theoretical values ​​at the factory. They are then updated in real time when the subsequent testing steps begin.

[0037] The interference torque was observed when the ceiling-mounted screen was off and the angle was less than 80°.

[0038] Before step S2, the latest damping friction force and viscosity coefficient need to be read from the data area of ​​the MCU.

[0039] The observed disturbance force values ​​are updated in real time.

[0040] S3. Obtain the real-time disturbance torque and compare it with the pinch protection threshold to perform pinch protection or shut-off operation.

[0041] Please see Figure 1 and Figure 4 The hand-clamping protection judgment is made when the ceiling-mounted screen is in the screen-off process and the angle is less than 30°.

[0042] The real-time disturbance torque needs to be obtained from step S2;

[0043] The hand-pinch protection is triggered when the disturbance torque exceeds the hand-pinch protection threshold.

[0044] The interference torque is less than the finger-pinching protection threshold, and the screen is turned off, then the process ends.

[0045] Furthermore, embodiments of the present invention also propose an electronic device, the device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer being configured to implement the steps of the hand-pinching detection method based on the load model of a vehicle-mounted ceiling screen as described above.

[0046] Furthermore, this embodiment of the invention also proposes a storage medium storing a computer program, which, when executed by a processor, implements the steps of the hand-clamping detection method based on the load model of a vehicle-mounted ceiling screen as described above.

[0047] It should be understood that the above are merely illustrative examples and do not constitute any limitation on the technical solutions of the present invention. In specific applications, those skilled in the art can make settings as needed, and the present invention does not impose any restrictions on this.

[0048] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of this invention. In practical applications, those skilled in the art can select some or all of the workflow to achieve the purpose of this embodiment according to actual needs, and no restrictions are imposed here.

[0049] In addition, for technical details not described in detail in this embodiment, please refer to the hand-pinching detection method based on the load model of the vehicle-mounted ceiling screen provided in any embodiment of the present invention, which will not be repeated here.

[0050] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of this invention. In practical applications, those skilled in the art can select some or all of the workflow to achieve the purpose of this embodiment according to actual needs, and no restrictions are imposed here.

[0051] In addition, for technical details not described in detail in this embodiment, please refer to the hand-pinching detection method based on the load model of the vehicle-mounted ceiling screen provided in any embodiment of the present invention, which will not be repeated here.

[0052] Furthermore, it should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0053] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0054] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as read-only memory (ROM) / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0055] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for detecting hand pinching based on a load model of a vehicle-mounted ceiling screen, characterized in that: Specifically comprising the following steps, Based on the ceiling screen load model, the damping friction and the viscous coefficient are observed in real time, and the observed values are updated and saved in real time; the components of the ceiling screen load model are defined by the vehicle-mounted ceiling screen kinematics equation, wherein the vehicle-mounted ceiling screen kinematics equation: ; In the formula: is the motor output torque, Rate is the speed ratio of the speed reducer, is the speed reducer efficiency, is the damping starting friction, J is the LCM inertia, is the LCM rotational angular velocity, B is the damping viscous friction coefficient, G is the LCM weight, H is the LCM height, is the LCM rotation angle, is the external disturbance force including the hand clamping collision disturbance force; The damping starting friction and The damping viscous friction coefficient is greatly deviated from the factory due to the characteristics of the limited damping material, and the temperature characteristics are relatively sensitive, so it needs to be calibrated in real time according to the actual working condition; is the external disturbance, and the feedback is the external disturbance force, which can be used for hand clamping logic judgment combined with the current rotation screen angle; Based on the ceiling screen load model and the calibrated friction and viscous coefficient in the above steps, the disturbance torque is observed in real time, and the observed value is updated in real time; Obtain the real-time disturbance torque and compare it with the hand clamping protection threshold to make hand clamping protection or shutdown operation; When the motion angle range of the ceiling screen is in the range of 90°±10°, the damping friction and viscous coefficient are observed; The observed value of the damping friction and viscous coefficient needs to meet the angle range and keep stable condition, if not, re-observation is needed; The damping friction and viscous coefficient observation value that meets the requirements updates the last calibration value and writes into the MCU data area; The damping friction and viscous coefficient are saved in the MCU chip data area, and the theoretical value is written at the time of factory shipment, and the real-time update is started at the time of later detection step.

2. The method of claim 1, wherein the method is based on a load model of a ceiling screen mounted on a vehicle. The disturbance torque observation is observed when the ceiling screen is off and the angle is less than 80°. 3.The method of claim 1, wherein the method comprises: The hand clamping protection judgment is made when the ceiling screen is off and the angle is less than 30°.

4. An electronic device, comprising: The device comprises a memory, a processor and a computer program stored on the memory and executable on the processor, and the computer is configured to implement the steps of the hand clamping detection method based on the vehicle-mounted ceiling screen load model according to any one of claims 1 to 3.

5. A storage medium, characterized by The storage medium stores a computer program, and the computer program is executed by the processor to implement the steps of the hand clamping detection method based on the vehicle-mounted ceiling screen load model according to any one of claims 1 to 3.

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