Touch control structure of automobile metal interior trim part and control method of touch control structure

Abstract

The invention discloses a touch control structure of an automobile metal interior trim part and a control method of the touch control structure. The touch control structure comprises a metal layer, a structure supporting layer and a PCB layer from top to bottom. Hollowed-out holes with touch control patterns are carved in the metal layer, and receding holes for receding the touch control patterns are formed in the structural supporting layer; the metal layer is fixedly connected with the structure supporting layer, and the structure supporting layer is used for being installed and connected with other structural parts; the PCB layer comprises a PCB, a transmitting end and a receiving end, wherein the transmitting end and the receiving end are installed on the PCB. And the PCB layer is fixedly connected with the structure supporting layer. Touch control can be achieved on the metal layer, micro deformation of the metal plate is avoided, and the service life of the interior panel is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of automotive trim panels, specifically relating to a touch-sensitive structure and control method for automotive metal interior trim parts. Background Technology

[0002] The automotive interior system is a crucial component of the car body, and its design workload accounts for over 60% of the overall vehicle styling design workload, far exceeding that of the exterior, making it one of the most important parts of the vehicle. With technological advancements and the increasing demands for multi-functionality in vehicles, interior components are beginning to incorporate touch controls to trigger certain functions. However, currently, for the sake of overall vehicle structural integrity, the interior system is largely constructed from metal and plastic materials to meet specific rigidity requirements.

[0003] Current touchscreen technology is based on glass substrates. Therefore, in order to meet the touch requirements, the industry can only use pressure-sensitive touch and double-layer touch film. However, both of these technologies require the metal panel to undergo micro-deformation during use, and the amount of deformation is detected for control. Although this method can achieve certain technical effects, in order to produce micro-deformation, the metal panel needs to be made very thin, which will greatly reduce local stress and also reduce the lifespan of the panel. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A touch control structure and control method for automotive metal interior trim, comprising, from top to bottom, a metal layer, a structural support layer, and a PCB layer;

[0006] The metal layer has perforated holes engraved with touch patterns, and the structural support layer has perforated holes to prevent the touch patterns from being exposed. The metal layer is fixedly connected to the structural support layer, and the structural support layer is used for installation and connection with other structural components.

[0007] The PCB layer includes a PCB board and a transmitter and a receiver mounted on the PCB board; the PCB layer is fixedly connected to the structural support layer.

[0008] Furthermore, the metal layer is an aluminum layer.

[0009] Furthermore, after the metal layer is stamped, insert plastic is injected to form a whole.

[0010] Furthermore, the transmitting end and the receiving end are infrared modules, ultrasonic modules, millimeter-wave modules, laser modules, or infrared modules.

[0011] Further, the PCB board is also electrically connected to a function module. The function module is electrically connected to the infrared emission end and the infrared reception end through the PCB board. The function module is used to execute required specific functions. When the infrared reception end receives a feedback signal, the function module starts to execute.

[0012] A control method for a touch structure of an automotive metal interior part includes the following steps:

[0013] S1): Set an initial threshold θ, set an initial time t, and set an interval time T: Set an initial threshold for adjusting the system sensitivity, set an initial time for recording time, and set an interval time for adjusting the time cycle length;

[0014] S2): Transmit infrared light: The emission end continuously transmits infrared light with a stable frequency;

[0015] S3): Receive infrared light: The infrared receiver continuously collects signals of the infrared light field and converts the signals into electrical signals. The control circuit processes and analyzes the received electrical signals;

[0016] S4): The ADC collects the current voltage value: The current voltage value of the electrical signal is sampled in real time, denoted as U. The plotter establishes a coordinate system with the horizontal axis as time and the vertical axis as the voltage value U, and plots the coordinate position of the current U in the coordinate system;

[0017] S5): Calculate the change amplitude τ of U: Compare the change amplitudes of two voltages. The formula is

[0018] τ = U1 - U0, where U1 is the current voltage value and U0 is the previous voltage value;

[0019] S6): Determine whether the current time is equal to the interval time T: Denote the time interval as Time = t1 - t0, where t1 is the current time and t0 is the previous initial time;

[0020] When Time = T, proceed to the next step 7;

[0021] When Time < T, execute step 10;

[0022] S7): Obtain all voltage values U within the time period T, denoted as U a 、U b 、U c 、U d ……U x , and calculate the average value U 平均 , and the formula is

[0023] U 平均 = (U a + U b + U c+U d ...U x ) / X, where X is the total number of U values;

[0024] S8): Calculate the floating difference θ 差 The formula for calculating the fluctuation difference of the U value within the time period is as follows:

[0025] θ 差 =U 平均 -U a

[0026] S9): Update threshold θ: Update the set threshold, the formula is θ = θ 差 +θ0, where θ0 is the previous threshold;

[0027] S10): Determine the change in U: Compare the magnitude of the voltage change τ with the threshold θ;

[0028] When τ > θ, the touch is detected and the relevant function is executed;

[0029] The loop repeats when τ≤θ.

[0030] Furthermore, in step 3, the control circuit processes the received electrical signal, including noise reduction to eliminate the influence of environmental noise, electromagnetic interference and other factors on the signal, or uses low-pass filtering to enhance the system's anti-interference capability.

[0031] Furthermore, in step 4, waveform detection and analysis can be performed to detect whether there are any changes in the waveform. When a change occurs in the waveform, it is detected as a touch and related functions are executed. The changes include waveform interruption, step, and impulse.

[0032] The beneficial effects of this invention are:

[0033] 1. The present invention emits an infrared beam in real time. The infrared beam passes through the cutout of the touch pattern and radiates outward. When a finger touches the touch pattern, the infrared beam is reflected back by the finger, passes through the cutout, and is received by the infrared receiver. At this time, an electrical signal is generated and fed back to the PCB board. The PCB board can execute the relevant function control by detecting the electrical signal. The touch structure of this invention provides accurate feedback, has a simple structure, avoids deformation of the metal panel surface, and improves the service life of the panel.

[0034] 2. This invention utilizes infrared detection for touch control, thereby reducing the use of numerous physical buttons and reducing production costs.

[0035] 3. This invention adds an adaptive threshold, which changes adaptively according to different ambient temperatures and light intensities, avoiding the impact of changes in ambient light intensity and temperature on the control system and improving system stability.

[0036] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0038] Figure 2 This is a schematic diagram illustrating the operating principle.

[0039] Figure 3 This is a schematic diagram of the pin wiring connection for Example 1;

[0040] Figure 4 This is a logic flowchart of the control method of the present invention;

[0041] Figure 5 This is a schematic diagram of the step waveform in this embodiment;

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Metal layer; 11. Hole cutout; 2. Structural support layer; 21. Hole cutout; 3. PCB layer; 31. PCB board; 32. Transmitter; 33. Receiver; 34. Temperature sensor; 35. Lamp assembly. Detailed Implementation

[0044] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention. Specific implementation examples:

[0046] like Figures 1 to 5 The touch structure and control method of an automotive metal interior component shown are, from top to bottom, a metal layer 1, a structural support layer 2, and a PCB layer 3.

[0047] The metal layer 1 has perforated holes 11 engraved with touch patterns, and the structural support layer 2 has perforated holes 21 for preventing the touch patterns from being exposed. The metal layer and the structural support layer 2 are fixedly connected, and the structural support layer 2 is used for installation and connection with other structural components. Specifically, the metal layer 1 is preferably aluminum, and the metal layer 1 needs to undergo oxidation, wire drawing, and printing processes. These steps not only form exquisite patterns on the aluminum surface but also protect the surface, increasing its wear resistance and corrosion resistance. Specifically, after the metal layer 1 is stamped, insert plastic injection is performed to form a whole. After injection molding, a touch pattern is laser-engraved at the corresponding position on the surface. The pattern position needs to be laser-engraved through the aluminum plate, that is, the perforated holes 11 of the touch pattern are engraved.

[0048] The PCB layer 3 includes a PCB board 31 and a transmitter 32 and a receiver 33 mounted on the PCB board 31; the PCB layer is fixedly connected to the structural support layer 2. Specifically, the transmitter 32 and receiver 33 are infrared modules, ultrasonic modules, millimeter-wave modules, and laser modules, preferably infrared modules. The principle of infrared technology is that an infrared beam is emitted by an infrared transmitter tube. When the infrared beam is blocked, it is reflected back to the infrared receiver tube; the infrared receiver tube detects the reflected infrared beam and generates an electrical signal to realize the switching control function. Specifically, the PCB board 31 is also electrically connected to a functional module. The functional module is electrically connected to the infrared transmitter and the infrared receiver 33 through the PCB board. The functional module is used to perform a specific function. When the infrared receiver 33 receives a feedback signal, the functional module starts to execute. In this embodiment, the functional modules selected are a temperature sensor 34 and a lamp group 35. Of course, this is only an example selection in this embodiment. Figure 2 When the transmitter 32 emits an infrared beam, when a finger touches the touch pattern, the infrared beam is reflected back by the finger and received by the infrared receiver 33, which generates an electrical signal that is fed back to the PCB board. After the PCB board detects the electrical signal, it increases the voltage of the lamp group 35, and the lamp group emits light. At the same time, it retrieves the electrical signal from the temperature sensor and outputs the real-time temperature inside the vehicle.

[0049] For the aforementioned touch structure, the specific control method includes the following steps:

[0050] S1): Set the initial threshold θ, set the initial time t, and set the interval time T: Set the initial threshold to adjust the system sensitivity, set the initial time to record the time, and set the interval time to adjust the time period length; Specifically, the analog quantity of the infrared light simulation pin is 0-3V, the initial threshold is set to 1.5V, the initial time is the power-on time, and the interval time is 20 seconds.

[0051] S2): Emit infrared light: The transmitter continuously emits infrared light at a stable frequency;

[0052] S3): Receiving infrared light: The infrared receiver continuously collects signals from the infrared light field and converts the signals into electrical signals. The control circuit processes and analyzes the received electrical signals. Specifically, the control circuit processes the received electrical signals, including noise reduction to eliminate the influence of environmental noise, electromagnetic interference and other factors on the signal, or by using low-pass filtering to enhance the system's anti-interference capability.

[0053] S4): The ADC samples the current voltage value: The current voltage value of the electrical signal is sampled in real time, denoted as U. The plotter establishes a coordinate system with the horizontal axis representing time and the vertical axis representing the voltage value U, and plots the coordinate position of the current U in the coordinate system. Specifically, based on the values sampled in real time, the plotter draws a function graph. At the same time, waveform detection and analysis can also be performed to detect whether there are any abnormalities in the waveform. When an abnormality occurs in the waveform, it is detected as a touch and relevant functions are executed. Among them, the abnormalities include waveform interruption, step, and impulse. As Figure 5 shown, the waveform in the figure shows a step-abnormal waveform diagram.

[0054] S5): Calculate the change amplitude τ of U: Compare the change amplitudes of the two voltages. The formula is

[0055] τ = U1 - U0, where U1 is the current voltage value and U0 is the previous voltage value. In this embodiment, it is assumed that U1 is measured as 2.9V at this time and the previous measurement was 2.8, so the change rate is +0.1

[0056] S6): Determine whether the current time is equal to the interval time T: Denote the time interval as Time = t1 - t0, where t1 is the current time and t0 is the previous initial time. The purpose here is to determine whether the interval time is equal to the set 20 seconds. If it is equal, the adaptive update threshold step needs to be performed.

[0057] When Time = T, proceed to the next step 7;

[0058] When Time < T, execute step 10;

[0059] S7): Obtain all the voltage values U within the time period T, denoted as U a 、U b 、U c 、U d ……U x , and calculate the average value U 平均 . The formula is

[0060] U 平均 = (U a + U b + U c + U d ……U x ) / X, where X is the total number of U values. Assume that in this embodiment, the average voltage within the time period is 2.85.

[0061] S8): Calculate the floating difference θ 差 : Calculate the floating difference of the U values within the time period. The formula is

[0062] θ 差 = U 平均 - U aSpecifically, based on the average value from the previous steps, set U... a If the voltage value is 2.8, then the floating difference is +0.05.

[0063] S9): Update threshold θ: Update the set threshold, the formula is θ = θ 差 +θ0, where θ0 is the previous threshold; specifically, since floating interpolation has occurred, it indicates that the ambient light and temperature have changed, so the threshold needs to be adjusted. Here, θ0 can be the initial threshold, and the updated threshold is θ = 1.5 + 0.05 = 1.55V.

[0064] S10): Determine the change in U: Compare the magnitude of the voltage change τ with the threshold θ;

[0065] When τ > θ, the touch is detected and the relevant function is executed;

[0066] When τ ≤ θ, the loop repeats. Specifically, in this case, τ in step 5 is 0.1, so 0.1 < 1.55, indicating no touch in this instance. Of course, if the voltage change τ is greater than 1.55, then it is determined to be a touch.

[0067] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A touch-sensitive structure for automotive metal interior trim, characterized in that... From top to bottom are the metal layer (1), the structural support layer (2), and the PCB layer (3); The metal layer (1) is engraved with hollow holes (11) of a touch pattern, and the structural support layer (2) is provided with clearance holes (21) for avoiding the touch pattern; the metal layer is fixedly connected to the structural support layer (2), and the structural support layer (2) is used for installation connection with other structural components; The PCB layer (3) includes a PCB board (31) and a transmitter (32) and a receiver (33) installed on the PCB board (31); the PCB layer is fixedly connected to the structural support layer (2).

2. The touch structure for automotive metal interior trim as described in claim 1, characterized in that: The metal layer (1) is an aluminum layer.

3. The touch structure for automotive metal interior trim according to claim 1, characterized in that: After the metal layer (1) is stamped, insert plastic injection is performed to form an integral body.

4. The touch structure for automotive metal interior trim as described in claim 1, characterized in that: The transmitter (32) and the receiver (33) are an infrared module, an ultrasonic module, a millimeter wave module, a laser module or an infrared module.

5. The touch structure for an automotive metal interior component according to claim 4, characterized in that: The PCB board (31) is also electrically connected to a functional module, and the functional module is electrically connected to the infrared transmitter and the infrared receiver (33) through the PCB board. The functional module is used to execute a required specific function. When the infrared receiver (33) receives a feedback signal, the functional module starts to execute.

6. The control method for the touch structure of automotive metal interior parts according to claims 1-5, characterized in that: It includes the following steps: S1): Set an initial threshold θ, set an initial time t, and set an interval time T: Set an initial threshold for adjusting the system sensitivity, set an initial time for recording time, and set an interval time for adjusting the time period length; S2): Transmit infrared light: The transmitter (32) continuously transmits infrared light of a stable frequency; S3): Receive infrared light: The infrared receiver continuously collects the signal of the infrared light field and converts the signal into an electrical signal. The control circuit processes and analyzes the received electrical signal; S4): ADC collects the current voltage value: The current electrical signal voltage value is sampled in real time, denoted as U. The plotter establishes a coordinate system with the horizontal axis as time and the vertical axis as the voltage value U, and plots the current coordinate position of U in the coordinate system; S5): Calculate the change amplitude τ of U: Compare the change amplitudes of two voltages. The formula is τ = U1 - U0, where U1 is the current voltage value and U0 is the previous voltage value; S^6): Judge whether the current time is equal to the interval time T: Denote the time interval as Time = t1 - t0, where t1 is the current time and t0 is the previous initial time; When Time = T, continue to the next step 7; When Time < T, execute step 10; S7): Obtain all voltage values ​​U within the time period T, denoted as U0. a U b U c U d ...U x And calculate the average value U. 平均 The formula is U 平均 =(U a +U b +U c +U d ...U x ) / X, where X is the total number of U values; S8): Calculate the floating difference θ 差 The formula for calculating the fluctuation difference of the U value within the time period is as follows: θ 差 =U 平均 -IN a S9): Update threshold θ: Update the set threshold, the formula is θ = θ 差 +θ0, where θ0 is the previous threshold; S10): Judge the change of U: Compare the change amplitude τ of the voltage U with the threshold θ; When τ > θ, it is detected as a touch and the relevant function is executed; When τ ≤ θ, repeat the execution in a loop.

7. The control method for the touch structure of automotive metal interior parts according to claim 6, characterized in that: In step 3, the control circuit processes the received electrical signal including denoising processing to eliminate the influence of factors such as environmental noise and electromagnetic interference on the signal, or adopts low-pass filtering processing to enhance the anti-interference ability of the system.

8. The control method for the touch structure of automotive metal interior parts according to claim 6, characterized in that: In step 4, waveform detection and analysis can also be performed to detect whether the waveform has abnormal changes. When the waveform has abnormal changes, it is detected as a touch and the relevant function is executed, where the abnormal changes include waveform interruption, step, and impulse.

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