A steering wheel key device based on tactile feedback and a tactile feedback method

Abstract

The application provides a steering wheel key device based on tactile feedback and a tactile feedback method; at least comprising a capacitive touch key module, a pressure sensing module, a tactile feedback execution module, a touch processing module and a piezoelectric driving module; the capacitive touch key module is used for collecting the capacitance value corresponding to the touch operation; the pressure sensing module is used for obtaining the pressure value corresponding to the touch operation; the touch processing module is used for converting the capacitance value and the pressure value into a touch instruction; the piezoelectric driving module is used for converting the touch instruction into a touch electric signal and outputting the touch electric signal to the tactile feedback execution module; the tactile feedback execution module responds to the touch electric signal and performs vibration feedback and sound feedback work. The application provides vibration and sound feedback to the user in time when the touch key selection function is selected, realizes simultaneous feedback to the user in the sense of touch and hearing, brings better driving experience, and can prevent misoperation, thereby ensuring driving safety to a certain extent.

Description

Technical Field

[0001] This application relates to the field of driver assistance technology, and in particular to a steering wheel button device and haptic feedback method based on haptic feedback. Background Technology

[0002] With the development of science and technology and the improvement of people's living standards, cars have gradually entered every household and become the preferred means of transportation. The car steering wheel usually integrates buttons, which can be used to control the horn, air conditioning, car screen, etc.

[0003] With traditional buttons, users select functions and drive internal modules by pressing or scrolling. However, traditional buttons are prone to becoming unresponsive and discolored or deformed after prolonged use, resulting in a poor user experience. They also lack a strong sense of technology and fail to appeal to users.

[0004] Therefore, people have made corresponding improvements to traditional buttons, and the existing improvement solutions are as follows:

[0005] Option 1: Integrate capacitive touch buttons on the steering wheel. When a user touches a button area, the corresponding capacitance value changes. The control unit converts this change in capacitance into a digital signal, which is then used to control relevant modules to complete the corresponding functions. However, this option does not provide user feedback when the button is touched, requiring manual confirmation and potentially leading to accidental touches.

[0006] Option 2: Integrate touch buttons with a rotary or linear motor onto the steering wheel. When a user touches a button area, it functions as in Option 1, while the magnet inside the linear motor vibrates, causing the button area to vibrate. This provides tactile feedback when the user touches the button. However, this linear motor takes up a relatively large space and has drawbacks such as slow response time.

[0007] Option 3: Similar to Option 2, add a sound unit or transmit the sound to the sound unit in the car body. However, this takes up a lot of space, and it is difficult for the sound and vibration to be synchronized, resulting in a poor user experience. Summary of the Invention

[0008] To address the aforementioned technical problems, this application provides a steering wheel button device and haptic feedback method that enhances the user's driving experience based on haptic feedback.

[0009] Specifically, this application provides a steering wheel button device based on haptic feedback, which includes at least a capacitive touch button module, a pressure sensing module, and a haptic feedback execution module attached from top to bottom, as well as a touch processing module and a piezoelectric drive module.

[0010] The capacitive touch button module is used to collect the capacitance value corresponding to the touch operation.

[0011] The pressure sensing module works in conjunction with the capacitive touch button module to obtain the pressure value corresponding to the touch operation.

[0012] The pressure sensing module, used in conjunction with the capacitive touch button module, can prevent accidental touches or interference from water stains.

[0013] The touch processing module is used to convert the capacitance value and pressure value into touch commands.

[0014] The piezoelectric drive module is used to convert the touch command into a touch electrical signal and output the touch electrical signal to the haptic feedback execution module.

[0015] The tactile feedback execution module responds to the touch electrical signal and performs vibration feedback and sound feedback.

[0016] The haptic feedback-based steering wheel button device provides users with timely vibration and sound feedback when selecting functions by touching the buttons, achieving simultaneous tactile and auditory feedback to the user, bringing a better driving experience, and preventing accidental touches, thus ensuring driving safety to a certain extent.

[0017] It also includes a LIN transceiver module, a LIN bus, and an interface; the LIN transceiver module is used to receive touch commands from the touch processing module and transmit the touch commands to the LIN bus; the LIN bus is used to forward the touch commands to the interface; the interface is used for a preset module to extract the touch commands.

[0018] The other preset modules can also extract the touch command, so that the preset modules can perform the corresponding operation according to the touch command; for example, if the user's current touch operation is to trigger the speaker, the speaker can extract the touch command corresponding to the current trigger operation to complete the speaker sound action.

[0019] It also includes a power module; the power module is used to supply power to the capacitive touch button module, pressure sensing module, touch processing module, piezoelectric drive module, haptic feedback execution module and LIN transceiver module.

[0020] The power module supplies power to the entire system, ensuring its normal operation.

[0021] The tactile feedback execution module includes, from top to bottom, an upper electrode layer, a piezoelectric material layer, a lower electrode layer, and a vibration layer.

[0022] It should be noted that the thickness of the haptic feedback execution module is less than 0.49mm, which means it occupies little space on the steering wheel and can be easily adapted to steering wheels of different shapes, demonstrating the versatility of this application.

[0023] The piezoelectric drive module communicates with the touch processing module via I2C to output the touch commands transmitted by the touch processing module as sinusoidal waveform signals with corresponding frequency and amplitude, and outputs the sinusoidal waveform signals with corresponding frequency and amplitude to the haptic feedback execution module.

[0024] I2C communication requires only two buses, has no strict baud rate requirements, and all components have a simple master-slave relationship. Each device connected to the bus can be addressed by software using a unique address. In addition, I2C communication includes four transmission modes, which can be adapted to various communication scenarios.

[0025] The sine wave is the most common and easiest waveform to generate, making this solution easier to implement.

[0026] The tactile feedback execution module drives the vibration layer to perform vibration feedback and sound feedback based on the received sinusoidal waveform signal through the upper electrode layer, piezoelectric material layer and lower electrode layer.

[0027] The haptic feedback execution module has a response time of less than 1ms, which is faster and enhances the user experience. In addition, the fast response time can also ensure driving safety to a certain extent.

[0028] The piezoelectric drive module, LIN transceiver module, touch processing module, interface and power module are integrated on a PCB board and connected to the capacitive touch button module, pressure sensing module and haptic feedback execution module through FPC respectively.

[0029] Integrating multiple modules onto a single PCB board reduces space requirements and further enhances the adaptability of steering wheels with different shapes.

[0030] It should be noted that FPC is a flexible circuit board, which is a type of flexible substrate that can be bent and twisted at will. It is usually used for connecting small components and is also an important design method for three-dimensional circuit structures.

[0031] The reason for choosing FPC to connect the PCB board to the capacitive touch button module, pressure sensing module and haptic feedback execution module is that FPC can be bent and twisted arbitrarily, and even the connection between extremely small components can be achieved through FPC.

[0032] One end of the interface is connected to the LIN transceiver module via a LIN bus, and the other end is connected to the power supply module.

[0033] Based on the same concept, this application also provides a method for a steering wheel button device based on haptic feedback, comprising the following steps:

[0034] S100: Collect the capacitance and pressure values ​​of the current touch operation, and determine whether the capacitance value is greater than a preset capacitance threshold and whether the pressure value is greater than a preset pressure threshold.

[0035] S200: If the capacitance value is greater than a preset capacitance threshold and the pressure value is greater than a preset pressure threshold, then the touch operation is determined to be a valid touch, and step S300 is executed; otherwise, step S400 is executed.

[0036] S300: Perform corresponding vibration feedback and sound feedback based on the capacitance and pressure values.

[0037] S400: Detect the relationship between the capacitance value and the pressure value and the preset capacitance threshold and the preset pressure threshold, respectively, and update the preset capacitance threshold and the preset pressure threshold based on the detection results.

[0038] The method of the steering wheel button device based on tactile feedback provides users with tactile and auditory feedback at the same time, bringing a better driving experience and preventing accidental touches, thus ensuring driving safety to a certain extent.

[0039] Step S300 includes:

[0040] The capacitance and pressure values ​​are converted into touch commands, and the touch commands are output as sinusoidal waveform signals with corresponding frequency and amplitude; vibration feedback and sound feedback are performed based on the sinusoidal waveform signals.

[0041] Step S400 includes:

[0042] If the capacitance value is greater than a preset capacitance threshold and the pressure value is less than a preset pressure threshold, then the current pressure value is updated to the preset pressure threshold.

[0043] If the capacitance value is less than a preset capacitance threshold and the pressure value is greater than a preset pressure threshold, then the current capacitance value is updated to the preset capacitance threshold.

[0044] If the capacitance value is less than a preset capacitance threshold and the pressure value is less than a preset pressure threshold, then the current capacitance value is updated to the preset capacitance threshold and the current pressure value is updated to the preset pressure threshold.

[0045] The threshold is updated based on the relationship between the latest detected capacitance and pressure values ​​and the threshold value, ensuring that the next touch operation can be performed effectively, further enhancing driving safety and improving user experience.

[0046] Compared with the prior art, the beneficial effects of this application are as follows:

[0047] This application includes at least a capacitive touch button module, a pressure sensing module, a haptic feedback execution module, a touch processing module, and a piezoelectric drive module; the capacitive touch button module is used to collect the capacitance value corresponding to the touch operation; the pressure sensing module is used to acquire the pressure value corresponding to the touch operation; the touch processing module is used to convert the capacitance value and pressure value into touch commands; the piezoelectric drive module is used to convert the touch commands into touch electrical signals and output the touch electrical signals to the haptic feedback execution module; the haptic feedback execution module responds to the touch electrical signals and performs vibration feedback and sound feedback operations.

[0048] This application provides users with timely vibration and sound feedback when selecting functions via touch buttons, achieving simultaneous tactile and auditory feedback, resulting in a better driving experience and preventing accidental touches, thus ensuring driving safety to a certain extent.

[0049] This invention solves the technical problems of existing capacitive touch buttons not providing user feedback and requiring manual confirmation, which may lead to accidental touches; it also solves the technical problems of existing linear motor buttons occupying a large space and having a slow response speed; and it also solves the technical problems of existing sound units occupying a large space, making it difficult for sound and vibration to be synchronized, resulting in a poor user experience. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the steering wheel button device based on haptic feedback described in this application.

[0051] Figure 2 for Figure 1 The flowchart of the method for the steering wheel button device based on haptic feedback. Detailed Implementation

[0052] This application provides a steering wheel button device and haptic feedback method based on haptic feedback to solve the technical problems of existing capacitive touch buttons that cannot provide feedback prompts to users, requiring users to manually confirm again, and may cause accidental touches; and to solve the technical problems of existing button linear motors that occupy a large space and have a slow response speed; and also to solve the technical problems of existing sound units that occupy a large space, have difficulty synchronizing sound and vibration, and have a poor user experience.

[0053] This application provides a steering wheel button device based on haptic feedback, the general concept of which is as follows:

[0054] The device includes, from top to bottom, a capacitive touch button module, a pressure sensing module, and a haptic feedback execution module, as well as a touch processing module and a piezoelectric drive module, all stacked together. The capacitive touch button module is used to collect the capacitance value corresponding to the touch operation. The pressure sensing module is used to acquire the pressure value corresponding to the touch operation. The touch processing module is used to convert the capacitance value and pressure value into touch commands. The piezoelectric drive module communicates with the touch processing module via I2C to output the touch commands transmitted by the touch processing module as sinusoidal waveform signals with corresponding frequency and amplitude, and outputs the sinusoidal waveform signals with corresponding frequency and amplitude to the haptic feedback execution module. The haptic feedback execution module includes, from top to bottom, an upper electrode layer, a piezoelectric material layer, a lower electrode layer, and a vibration layer. The haptic feedback execution module drives the vibration layer to perform vibration feedback and sound feedback based on the received sinusoidal waveform signal through the upper electrode layer, piezoelectric material layer, and lower electrode layer.

[0055] The following describes in further detail a steering wheel button device and haptic feedback method based on haptic feedback according to specific embodiments and accompanying drawings.

[0056] Example 1:

[0057] Please see Figure 1 This application provides a steering wheel button device based on haptic feedback, which includes at least a capacitive touch button module, a pressure sensing module, and a haptic feedback execution module attached from top to bottom, as well as a touch processing module and a piezoelectric drive module.

[0058] For example, three capacitive touch button modules are set on the left and right sides of the steering wheel, and a pressure sensing module is attached below each of the three capacitive touch button modules. Below each pressure sensing module, a haptic feedback execution module is attached.

[0059] Two piezoelectric drive modules are connected to the haptic feedback execution module; a touch processing module is connected to the two piezoelectric drive modules.

[0060] It should be noted that this solution can support up to 10 capacitive touch button modules, and the position of the capacitive touch button modules on the steering wheel can be placed in, but is not limited to, the traditional button position. The placement of the capacitive touch button modules is relatively free and has no special limitations. Those skilled in the art can make adaptive settings according to actual needs.

[0061] The capacitive touch button module is used to collect the capacitance value corresponding to the touch operation.

[0062] Assume that the function of capacitive touch button module 1 is to answer Bluetooth calls, corresponding to the first capacitance threshold F1, the first vibration amplitude, and the first sound frequency; the function of capacitive touch button module 2 is to increase the volume, corresponding to the second capacitance threshold F2, the second vibration amplitude, and the second sound frequency; the function of capacitive touch button module 3 is to decrease the volume, corresponding to the third capacitance threshold F3, the third vibration amplitude, and the third sound frequency; the function of capacitive touch button module 4 is to control the speaker, corresponding to the fourth capacitance threshold F4, the fourth vibration amplitude, and the fourth sound frequency; the function of capacitive touch button module 5 is to activate cruise control, corresponding to the fifth capacitance threshold F5, the fifth vibration amplitude, and the fifth sound frequency; and the function of capacitive touch button module 6 is to deactivate cruise control, corresponding to the sixth capacitance threshold F6, the sixth vibration amplitude, and the sixth sound frequency.

[0063] It should be noted that the working principle of the capacitive touch button module is based on the basic law of capacitance. When the distance between charged objects changes, the capacitance they form also changes. The sensor board on the capacitive touch button module will also detect the capacitance change, and then convert the capacitance value into a digital signal and transmit it to the touch processing module.

[0064] The pressure sensing module works in conjunction with the capacitive touch button module to obtain the pressure value corresponding to the touch operation.

[0065] Both pressure sensing modules correspond to a pressure threshold of F7.

[0066] The touch processing module is used to convert the capacitance value and pressure value into touch commands.

[0067] It should be noted that, in this embodiment, the touch processing module is preferably the TCAE31 model.

[0068] In this embodiment, the touch processing module is preferably an MCU chip of model TCAE31, in order to realize the detection and conversion of capacitance and pressure values, as well as the feedback transmission of commands.

[0069] The switching operation of the touch processing module will only be triggered when the touch processing module detects that the capacitance value and pressure value corresponding to the touch operation are both greater than the Nth capacitance threshold FN (1≤N≤6) and the pressure threshold F7.

[0070] For example, if the current touch operation triggers the No. 1 capacitive touch button module, the current capacitance value and pressure value are T1 and T2 respectively; the touch processing module detects that T1 > F1 and T2 > F7, and determines that the touch operation is valid. At this time, the touch processing module converts the capacitance value and pressure value into a touch command.

[0071] The piezoelectric drive module is used to convert the touch command into a touch electrical signal and output the touch electrical signal to the haptic feedback execution module.

[0072] When the touch operation is valid, the piezoelectric drive module converts the touch command transmitted from the touch processing module into a touch electrical signal, and transmits the touch electrical signal to the haptic feedback execution module to drive the relevant components of the haptic feedback execution module to work.

[0073] It should be noted that the driver IC of the piezoelectric drive module is preferably the DRV2667 model.

[0074] The piezoelectric drive module communicates with the touch processing module via I2C to output the touch commands transmitted by the touch processing module as sinusoidal waveform signals with corresponding frequency and amplitude, and outputs the sinusoidal waveform signals with corresponding frequency and amplitude to the haptic feedback execution module.

[0075] The aforementioned touch signal is a sinusoidal waveform signal with frequency and amplitude corresponding to the touch command after the capacitance value T1 is converted.

[0076] The tactile feedback execution module responds to the touch electrical signal and performs vibration feedback and sound feedback.

[0077] The tactile feedback execution module includes, from top to bottom, an upper electrode layer, a piezoelectric material layer, a lower electrode layer, and a vibration layer.

[0078] The overall thickness of the upper electrode layer, piezoelectric material layer, lower electrode layer and vibration layer after lamination is less than 0.49mm. For example, various models such as PHUA3015 or PHUA3030 can be selected. In this embodiment, a piezoelectric haptic feedback execution module is preferred. Only the thickness is roughly limited, while the length and width are not limited. Those skilled in the art can adjust it according to the shape design needs of the steering wheel. The solution is relatively flexible, occupies less space on the steering wheel, and can better adapt to steering wheels of different shapes.

[0079] However, the thickness of existing linear motors is usually above 1.5mm, and the thickness of rotor motors can reach above 5mm. Both require a lot of space, and the placement position needs to be reserved during the design, making the solution less flexible.

[0080] The tactile feedback execution module drives the vibration layer to perform vibration feedback and sound feedback based on the received sinusoidal waveform signal through the upper electrode layer, piezoelectric material layer and lower electrode layer.

[0081] Therefore, the user pressed the No. 1 capacitive touch button module, so the vibration feedback and sound feedback provided at this time are the first vibration amplitude and the first sound frequency, respectively.

[0082] In addition, short voice prompts can be set, such as a voice prompt when the user presses the horn button, so that the user can more clearly know which function button has been selected.

[0083] It should be noted that the piezoelectric haptic feedback execution module used in this embodiment has a response time of less than 1ms. In contrast, the response time of the linear motor used in the prior art is about 10ms. The response time of the piezoelectric haptic feedback execution module is shorter.

[0084] It also includes a LIN transceiver module, a LIN bus, and an interface; the LIN transceiver module is used to receive touch commands from the touch processing module and transmit the touch commands to the LIN bus; the LIN bus is used to forward the touch commands to the interface; the interface is used for a preset module to extract the touch commands.

[0085] For example, if the user's touch operation is to press the capacitive touch button module No. 4, the MCU chip will parse the button value corresponding to the touch operation. The preset module connected to the interface is a speaker module, which can extract the touch command and then execute the corresponding speaker sound operation.

[0086] It also includes a power module; the power module is used to supply power to the capacitive touch button module, pressure sensing module, touch processing module, piezoelectric drive module, haptic feedback execution module and LIN transceiver module.

[0087] The piezoelectric drive module, LIN transceiver module, touch processing module, interface and power module are integrated on a PCB board and connected to the capacitive touch button module, pressure sensing module and haptic feedback execution module through FPC respectively.

[0088] One end of the interface is connected to the LIN transceiver module via a LIN bus, and the other end is connected to the power supply module.

[0089] Example 2:

[0090] Please see Figure 2 This application also provides a method for a steering wheel button device based on haptic feedback, comprising the following steps:

[0091] S100: Collect the capacitance and pressure values ​​of the current touch operation, and determine whether the capacitance value is greater than a preset capacitance threshold and whether the pressure value is greater than a preset pressure threshold.

[0092] It should be noted that when collecting capacitance and pressure values, the device needs to be initialized to ensure the validity of the collected capacitance and pressure values ​​and prevent accidental activation.

[0093] S200: If the capacitance value is greater than a preset capacitance threshold and the pressure value is greater than a preset pressure threshold, then the touch operation is determined to be a valid touch, and step S300 is executed; otherwise, step S400 is executed.

[0094] S300: Perform corresponding vibration feedback and sound feedback based on the capacitance and pressure values.

[0095] Step S300 includes:

[0096] The capacitance and pressure values ​​are converted into touch commands, and the touch commands are output as sinusoidal waveform signals with corresponding frequency and amplitude; vibration feedback and sound feedback are performed based on the sinusoidal waveform signals.

[0097] Simultaneously, the touch command will be output to the LIN bus, which will then forward the touch command to the interface. The interface allows the preset module to extract the touch command, enabling the preset module to perform the operation corresponding to the touch command.

[0098] For example, when a touch command is transmitted to a speaker, the speaker module will receive the touch command and then execute the speaker to produce sound.

[0099] After the preset module completes its corresponding task, it waits for the next button press and then returns to step S100.

[0100] S400: Detect the relationship between the capacitance value and the pressure value and the preset capacitance threshold and the preset pressure threshold, respectively, and update the preset capacitance threshold and the preset pressure threshold based on the detection results.

[0101] Step S400 includes:

[0102] If the capacitance value is greater than a preset capacitance threshold and the pressure value is less than a preset pressure threshold, then the current pressure value is updated to the preset pressure threshold.

[0103] If the capacitance value is less than a preset capacitance threshold and the pressure value is greater than a preset pressure threshold, then the current capacitance value is updated to the preset capacitance threshold.

[0104] If the capacitance value is less than a preset capacitance threshold and the pressure value is less than a preset pressure threshold, then the current capacitance value is updated to the preset capacitance threshold and the current pressure value is updated to the preset pressure threshold.

[0105] In summary, this application provides a steering wheel button device and haptic feedback method based on haptic feedback. The haptic feedback steering wheel button device includes at least a capacitive touch button module, a pressure sensing module, a haptic feedback execution module, a touch processing module, and a piezoelectric drive module. The capacitive touch button module is used to collect the capacitance value corresponding to the touch operation. The pressure sensing module is used to acquire the pressure value corresponding to the touch operation. The touch processing module is used to convert the capacitance value and pressure value into touch commands. The piezoelectric drive module is used to convert the touch commands into touch electrical signals and output the touch electrical signals to the haptic feedback execution module. The haptic feedback execution module responds to the touch electrical signals and performs vibration and sound feedback. This application provides users with timely vibration and sound feedback when selecting functions by touching the buttons, achieving simultaneous tactile and auditory feedback, resulting in a better driving experience and preventing accidental touches, thus ensuring driving safety to a certain extent.

[0106] Although exemplary embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above exemplary embodiments are merely illustrative and are not intended to limit the scope of this application. Various changes and modifications can be made therein by those skilled in the art without departing from the scope and spirit of this application. All such changes and modifications are intended to be included within the scope of this application as claimed in the appended claims.

[0107] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed.

[0108] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0109] Although the description of this application has been made in conjunction with the specific embodiments described above, it will be apparent to those skilled in the art that many substitutions, modifications, and variations can be made based on the foregoing. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A steering wheel button device based on haptic feedback, characterized in that, It includes at least a capacitive touch button module, a pressure sensing module, and a haptic feedback execution module, which are attached sequentially from top to bottom, as well as a touch processing module and a piezoelectric drive module; The capacitive touch button module is used to collect the capacitance value corresponding to the touch operation; The pressure sensing module is used in conjunction with the capacitive touch button module to obtain the pressure value corresponding to the touch operation. The touch processing module is used to convert the capacitance value and pressure value into touch commands; The piezoelectric drive module is used to convert the touch command into a touch electrical signal and output the touch electrical signal to the haptic feedback execution module; The tactile feedback execution module responds to the touch electrical signal and performs vibration feedback and sound feedback; the tactile feedback execution module includes an upper electrode layer, a piezoelectric material layer, a lower electrode layer and a vibration layer stacked from top to bottom; It also includes a LIN transceiver module, an interface and a power module. The piezoelectric drive module, LIN transceiver module, touch processing module, interface and power module are integrated on a PCB board and are respectively connected to the capacitive touch button module, pressure sensing module and haptic feedback execution module through FPC. The piezoelectric drive module communicates with the touch processing module via I2C to output the touch commands transmitted by the touch processing module as sinusoidal waveform signals with corresponding frequency and amplitude, and outputs the sinusoidal waveform signals with corresponding frequency and amplitude to the haptic feedback execution module. The tactile feedback execution module drives the vibration layer to perform vibration feedback and sound feedback based on the received sinusoidal waveform signal through the upper electrode layer, piezoelectric material layer and lower electrode layer.

2. The steering wheel button device based on haptic feedback according to claim 1, characterized in that, It also includes the LIN bus; The LIN transceiver module is used to receive touch commands from the touch processing module and transmit the touch commands to the LIN bus; The LIN bus is used to forward the touch commands to the interface; The interface is used for the preset module to extract the touch commands.

3. The steering wheel button device based on haptic feedback according to claim 2, characterized in that, The power module is used to supply power to the capacitive touch button module, pressure sensing module, touch processing module, piezoelectric drive module, haptic feedback execution module, and LIN transceiver module.

4. The steering wheel button device based on haptic feedback according to claim 2, characterized in that, One end of the interface is connected to the LIN transceiver module via a LIN bus, and the other end is connected to the power supply module.

5. A method for using a steering wheel button device based on haptic feedback as described in any one of claims 1-4, characterized in that, Includes the following steps: S100: Collect the capacitance value and pressure value of the current touch operation, and determine whether the capacitance value is greater than a preset capacitance threshold and whether the pressure value is greater than a preset pressure threshold. S200: If the capacitance value is greater than a preset capacitance threshold and the pressure value is greater than a preset pressure threshold, then the current touch operation is determined to be a valid touch, and step S300 is executed. Otherwise, proceed to step S400; S3 00: Execute corresponding vibration and sound feedback based on the capacitance and pressure values; S400: Detect the relationship between the capacitance value and the pressure value and the preset capacitance threshold and the preset pressure threshold, respectively, and update the preset capacitance threshold and the preset pressure threshold based on the detection results.

6. The method according to claim 5, characterized in that, Step S300 includes: converting the capacitance value and pressure value into touch commands, and outputting the touch commands as sinusoidal waveform signals with corresponding frequency and amplitude; Vibration feedback and sound feedback are performed based on the sinusoidal waveform signal.

7. The method according to claim 6, characterized in that, Step S400 includes: if the capacitance value is greater than a preset capacitance threshold and the pressure value is less than a preset pressure threshold, then update the current pressure value to the preset pressure threshold. If the capacitance value is less than a preset capacitance threshold and the pressure value is greater than a preset pressure threshold, then the current capacitance value is updated to the preset capacitance threshold. If the capacitance value is less than a preset capacitance threshold and the pressure value is less than a preset pressure threshold, then the current capacitance value is updated to the preset capacitance threshold and the current pressure value is updated to the preset pressure threshold.

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