A multi-module vehicle-mounted tactile feedback device based on PVDF piezoelectric film

Abstract

The application discloses a multi-module vehicle-mounted tactile feedback device based on a PVDF piezoelectric film, which comprises a feedback device shell with a mounting groove with a top opening; a plurality of piezoelectric drivers installed at the bottom of the mounting groove, the piezoelectric drivers being arranged at intervals; a plurality of pressure sensors arranged one by one with the piezoelectric drivers, the pressure sensors being arranged at the top of the piezoelectric drivers; the pressure sensors having intervals therebetween and the pressure sensors having intervals with the inner wall of the feedback device shell; a plurality of piezoelectric sheets arranged in the mounting groove and arranged one by one at the top of the pressure sensors; the piezoelectric sheets having intervals therebetween and the piezoelectric sheets having intervals with the inner wall of the feedback device shell; an elastomer arranged circumferentially around the vertical surface of each piezoelectric sheet, sealing the intervals between the piezoelectric sheets and the intervals between the piezoelectric sheets and the inner wall of the feedback device shell; and a film covering the top of the feedback device shell.

Description

Technical Field

[0001] This invention belongs to the field of piezoelectric vibration device technology, and specifically relates to a multi-module vehicle-mounted tactile feedback device based on PVDF piezoelectric film. Background Technology

[0002] In recent years, with the development of autonomous driving technology and automotive intelligence technology, the interaction between cars and drivers has received increasing attention. However, current automotive interaction methods largely revolve around human vision and hearing, neglecting tactile feedback and interaction. The widely adopted touchscreen in-vehicle systems use capacitive touchscreens, which operate by sensing the electrical current generated when the human touches the screen. However, touchscreens do not produce any mechanical movement during operation. Drivers often cannot obtain effective feedback simply by tapping the screen with their fingers, leading to uncertainty about the accuracy or effectiveness of their touch. This forces them to shift their gaze to the screen, making it difficult to keep their eyes on the road, significantly impacting driving attention and safety.

[0003] Currently, existing in-vehicle haptic interaction systems include mechanical buttons and touchscreens. However, the former has a short lifespan, is prone to physical damage, and has a high possibility of accidental touches. The latter has high manufacturing costs, a single feedback mode, low space utilization, and low sensitivity, resulting in a poor user experience. While existing in-vehicle voice interaction simplifies the interaction method, it can lead to an inability to represent information hierarchy, resulting in lower reception efficiency. Secondly, receiving voice information consumes the user's attention and increases the memory burden. In certain special environments, interactive voice may overlap with other sounds, affecting the user's judgment. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-module vehicle-mounted tactile feedback device based on PVDF piezoelectric film, which can realize multi-touch feedback and improve the sensitivity and accuracy of tactile feedback.

[0005] The technical solution provided by this invention is as follows:

[0006] A multi-module vehicle-mounted haptic feedback device based on PVDF piezoelectric thin film includes:

[0007] Feedback device housing with a mounting slot having a top opening;

[0008] Multiple piezoelectric actuators are mounted at the bottom of the mounting slot, and the multiple piezoelectric actuators are spaced apart;

[0009] a plurality of pressure sensors, which are arranged one-to-one with the piezoelectric drivers, and are arranged on the top of the piezoelectric drivers; the plurality of pressure sensors have a spacing between them, and the pressure sensors have a spacing between them and the inner wall of the feedback device shell;

[0010] a plurality of piezoelectric sheets, which are arranged in the mounting groove, and are arranged one-to-one on the top of the pressure sensors; the plurality of piezoelectric sheets have a spacing between them, and the piezoelectric sheets have a spacing between them and the inner wall of the feedback device shell;

[0011] wherein the piezoelectric sheets are electrically connected one-to-one with the piezoelectric drivers, and the piezoelectric drivers provide driving voltage for the piezoelectric sheets;

[0012] an elastomer, which is arranged around the vertical circumference of each piezoelectric sheet, and seals the spacing between the plurality of piezoelectric sheets and the spacing between the piezoelectric sheets and the inner wall of the feedback device shell;

[0013] a film, which is a flexible film, and is fixedly connected to the top of the piezoelectric sheets and the top of the feedback device shell, respectively.

[0014] Preferably, the multi-module vehicle-mounted tactile feedback device based on PVDF piezoelectric film further comprises:

[0015] a piezoelectric sheet housing, which is arranged between the piezoelectric sheets and the pressure sensors, and is fixedly connected with the feedback device shell;

[0016] wherein the piezoelectric sheet housing has a plurality of grooves, which are one-to-one corresponding to the piezoelectric sheets, and match the size of the piezoelectric sheets; the bottom of the piezoelectric sheet abuts against the bottom of the groove.

[0017] Preferably, the piezoelectric sheet housing comprises:

[0018] a main body portion, which comprises a plurality of barrels, the top of the barrel is open, and the inner cavity forms the groove;

[0019] a first connecting portion, which is fixedly connected between the plurality of barrels;

[0020] a second connecting portion, the inner edge of which is fixedly connected to the outer edge of the main body portion and the first connecting portion, and the outer edge of the second connecting portion is fixedly connected to the inner wall of the mounting groove;

[0021] wherein the first connecting portion and the second connecting portion are both connected to the top end of the main body portion.

[0022] Preferably, the top of the piezoelectric sheet protrudes from the top of the first connecting part and the top of the second connecting part, and the elastic body covers the first connecting part and the second connecting part simultaneously.

[0023] Preferably, the feedback device housing comprises:

[0024] A bearing body having a through hole;

[0025] An end cover having an open-ended cylindrical structure, the end cover is coaxially arranged with the through hole, and the inner diameter of the end cover is the same as the hole diameter of the through hole;

[0026] The end cover is fixedly connected to the bottom of the bearing body, and the inner cavity of the end cover and the through hole form the mounting groove.

[0027] Preferably, the top of the elastic body, the top of the piezoelectric sheet and the top of the bearing body are flush.

[0028] Preferably, the piezoelectric sheet is a PVDF piezoelectric sheet.

[0029] Preferably, the vibration frequency of the piezoelectric sheet is set to 50Hz-500Hz.

[0030] Preferably, the vibration frequencies of the plurality of piezoelectric sheets are different.

[0031] Preferably, a pressing area is demarcated on the film, and the edge of the pressing area coincides with the edge of the overall area formed by the plurality of piezoelectric sheets.

[0032] The beneficial effects of the present application are:

[0033] The multi-module vehicle-mounted tactile feedback device based on the PVDF piezoelectric film provided by the present application can realize pressing tactile feedback.

[0034] The multi-module vehicle-mounted tactile feedback device based on the PVDF piezoelectric film provided by the present application has a multi-point tactile feedback mode, so that users can experience a variety of modal feedback signals, and the accuracy and sensitivity of tactile feedback are enhanced.

[0035] The multi-module vehicle-mounted tactile feedback device based on the PVDF piezoelectric film provided by the present application can be installed on numerous unused curved surfaces of vehicle armrests and vehicle doors, greatly saving the use of interior space of the vehicle, and providing more useful interior space for users. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 The cross-sectional view of the multi-module vehicle-mounted tactile feedback device based on the PVDF piezoelectric film.

[0037] Figure 2 This is an exploded view of the multi-module vehicle-mounted haptic feedback device based on PVDF piezoelectric film described in this invention.

[0038] Figure 3 This is a schematic diagram of the structure of the piezoelectric sheet housing described in this invention.

[0039] Figure 4 This is a schematic diagram of the working process described in this invention. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0041] like Figures 1-3 As shown, the present invention provides a multi-module vehicle-mounted haptic feedback device based on PVDF piezoelectric film, which mainly includes: a feedback device housing 110, a piezoelectric actuator 120, a pressure sensor 130, a piezoelectric sheet 140, an elastomer 150, and a film 160.

[0042] The feedback device housing 110 has a mounting slot with a top opening; a plurality of piezoelectric actuators 120 are mounted at the bottom of the mounting slot, and the plurality of piezoelectric actuators 120 are spaced apart. A plurality of pressure sensors 130 are arranged in a one-to-one correspondence with the piezoelectric actuators 120, and the pressure sensors 130 are located on top of the piezoelectric actuators 120; there are gaps between the plurality of pressure sensors 130, and there are gaps between the pressure sensors 130 and the inner wall (mounting slot wall) of the feedback device housing 110.

[0043] Multiple piezoelectric elements 140 are disposed on the top of the mounting groove, and each piezoelectric element 140 is correspondingly mounted on the pressure sensor 130. There are gaps between the piezoelectric elements 140 and between each piezoelectric element 140 and the inner wall (mounting groove wall) of the feedback device housing 110. A piezoelectric actuator 120 is electrically connected to each piezoelectric element 140, providing a driving voltage to cause the piezoelectric element 140 to vibrate. By using the pressure sensor 130, the activation of the piezoelectric actuator 120 can be determined based on the magnitude of the touch pressure, preventing accidental activation.

[0044] In this embodiment, the mounting groove of the feedback device housing 110 is a cylindrical groove; the piezoelectric sheet 140 is fan-shaped, and there are three piezoelectric sheets 140, three piezoelectric actuators 120, and three pressure sensors 130. In practical applications, the shape of the piezoelectric sheet 140 can be set to annular, rectangular, or other shapes, and the positions of the actuator 120 and the pressure sensor 130 can be adjusted accordingly.

[0045] An elastomer 150 is disposed at the top of the mounting groove and is arranged circumferentially around the vertical surface of each piezoelectric element 140, sealing the gaps between the multiple piezoelectric elements 140 and the gaps between the piezoelectric elements 140 and the inner wall (mounting groove wall) of the feedback device housing 110. The elastomer 150 surrounds the piezoelectric elements 140, acting as a buffer to reduce mutual interference between the vibration modules.

[0046] The thin film 160 is a flexible thin film. The thin film 160 covers the top of the feedback device housing 110 and is fixedly connected to the top of the piezoelectric sheet 140 and the top of the feedback device housing 110, respectively.

[0047] In this embodiment, the film 160 is made of TPU material.

[0048] As a preferred embodiment, the vehicle-mounted piezoelectric tactile feedback device further includes a piezoelectric sheet housing 170, which is disposed between the piezoelectric sheet 140 and the pressure sensor 130 to support the piezoelectric sheet 140; the piezoelectric sheet housing 170 is fixedly connected to the feedback device housing 110. The piezoelectric sheet housing 170 has multiple grooves 170a, each corresponding to a piezoelectric sheet 140 and matching the size of the piezoelectric sheet 140; the bottom of the piezoelectric sheet 140 abuts against the bottom of the groove 170a.

[0049] like Figure 3 As shown, as a further preferred embodiment, the piezoelectric sheet housing 170 includes: a main body 171, a first connecting portion 172, and a second connecting portion 173. The main body 171 includes a plurality of cylindrical bodies, each with an opening at the top and an inner cavity forming a groove 170a. The first connecting portion 172 is fixedly connected between the plurality of cylindrical bodies; the inner edge of the second connecting portion 173 is fixedly connected to the outer edges of both the main body 171 and the first connecting portion 172, and the outer edge of the second connecting portion 173 is fixedly connected to the inner wall of the mounting groove of the feedback device housing 110. Both the first connecting portion 172 and the second connecting portion 173 are connected to the top of the main body 171. The top of the piezoelectric sheet 140 protrudes from the top of the first connecting portion 172 and the top of the second connecting portion 173; the elastomer 150 simultaneously covers the first connecting portion 172 and the second connecting portion 173. The first connecting part 172 and the second connecting part 173 are thin plate structures, which can also play a certain role in vibration buffering. By combining the structure of the first connecting part 172 and the second connecting part 173 with the elastic body 150, the vibration buffering effect can be further improved.

[0050] As a preferred, in order to facilitate installation, the feedback device housing 110 adopts a detachable structure, which comprises: a bearing body 111 and an end cover 112. The bearing body 111 is a plate structure, which is provided with a through hole; the end cover 112 is a cylindrical structure with one end open, the end cover 112 is coaxially arranged with the through hole, and the inner diameter of the end cover 112 is the same as the hole diameter of the through hole. Among them, the end cover 112 is fixedly connected on the bottom of the bearing body 111 by screws, and the inner cavity of the end cover 112 and the through hole on the bearing body 111 form the mounting groove. The top of the elastic body 150, the top of the piezoelectric sheet 140 and the top of the bearing body 111 are flush.

[0051] In this embodiment, the bearing body 111 of the feedback device housing 110 and the piezoelectric sheet shell 170 are integrally formed structures, and the material is fiber reinforced plastic; the material of the end cover 112 is the same as that of the bearing body 111. The fiber reinforced plastic has the advantages of good corrosion resistance, comfort, flexibility, friction resistance, impact resistance, easy processing, light weight, etc. The piezoelectric sheet 140 and the film 160 are adhered by soft drop glue, and the film 160 and the bearing body 111 are adhered by soft drop glue.

[0052] The elastic body 150 can adopt rubber with good elasticity, such as polyolefin thermoplastic elastomer. Polyolefin thermoplastic elastomer is a high-performance elastic material, which is rubbery at room temperature, has the characteristics of small density, large bending, high low-temperature impact resistance, easy processing, and can be reused. The elastic body 150 is fixed with the piezoelectric sheet 140 and the feedback device shell by adhesive bonding.

[0053] As a preferred, the piezoelectric sheet adopts PVDF piezoelectric sheet. PVDF piezoelectric sheet (film) is a soft, light and high toughness plastic film, which can be made into various shapes and thicknesses according to needs. PVDF piezoelectric sheet has high chemical stability, which is 10 times higher than ceramic, and can be used for a long time at-40℃-80℃, and can adapt to various environments. The harmonic frequency of the stretching vibration of PVDF piezoelectric sheet in the thickness direction is very high, and the frequency band response is wide (0-500MHz), which is much better than ordinary piezoelectric ceramic transducer, and the application sensitivity is higher. PVDF piezoelectric film is soft and tough, and the compliance coefficient is about 30 times that of PzT, and the specific gravity is only about 1 / 4 of PzT, which can be made into various complex shapes and perfectly fit the curved surface; It can be applied to the curved surface structure of car handrails and car doors.

[0054] The pressing area is marked on the film 160, and the edge of the pressing area coincides with the edge of the whole area composed of a plurality of piezoelectric sheets 140; that is, the pressing area covers the area where all the piezoelectric sheets 140 are located.

[0055] As a preferred, the pressure sensor 130 adopts a thin film pressure sensor, which occupies small space, has high stability and sensitivity. The pressure sensor 130 is connected with a conversion module, which converts the resistance signal of the pressure sensor 130 into an analog voltage signal output to the control unit. The control unit compares the input signal value with the set pressure signal threshold value, and if the input signal value is higher than the pressure signal threshold value, the control unit controls to open the piezoelectric driver 120 corresponding to the pressure sensor 130. Wherein, the control unit can store and select different vibration modes, so as to control the piezoelectric driver 120 to output the driving voltage corresponding to the selected vibration mode, so that the piezoelectric sheet 140 generates corresponding frequency vibration.

[0056] As a preferred, the vibration frequency of the piezoelectric sheet 140 is set to 50Hz-500Hz; in this frequency range, the user can obtain more obvious tactile feedback.

[0057] As a further preferred, a plurality of piezoelectric sheets 140 are set to different vibration frequencies, for example, the vibration frequencies of three piezoelectric sheets 140 are set to 100Hz, 200Hz and 300Hz respectively. When the user touches one or more piezoelectric sheets 140, different combinations of vibration can be obtained, realizing that a single piezoelectric tactile feedback device outputs multiple tactile feedbacks. Further improve the sensitivity and accuracy of the tactile feedback.

[0058] As shown in Figure 4 When the user touches the pressing area on the film 160, the pressure sensor 130 can detect the pressure and transmit it to the control unit (module). When the control unit (module) judges that the pressure reaches the set threshold value (minimum driving value), the piezoelectric driver 120 corresponding to the pressure sensor 130 is started, the piezoelectric driver 120 outputs the driving voltage, drives the piezoelectric sheet 140 to vibrate, and generates different combinations of vibration feedback in the pressing area.

[0059] Although the embodiments of the present application have been disclosed as above, they are not limited to the application listed in the specification and embodiments, and can be fully applied to various fields suitable for the present application. For those skilled in the art, other modifications can be easily realized, and therefore the present application is not limited to specific details and examples shown and described herein.

Claims

1. A multi-module vehicle-mounted haptic feedback device based on PVDF piezoelectric thin film, characterized in that, include: Feedback device housing with a mounting slot having a top opening; Multiple piezoelectric actuators are mounted at the bottom of the mounting slot, and the multiple piezoelectric actuators are spaced apart; Multiple pressure sensors are provided, each corresponding to a piezoelectric actuator, and the pressure sensors are located on top of the piezoelectric actuator; there are gaps between the multiple pressure sensors, and there are gaps between the pressure sensors and the inner wall of the feedback device housing; Multiple piezoelectric elements are disposed within the mounting groove, and each piezoelectric element is disposed on top of the pressure sensor in a corresponding manner; there is a gap between the multiple piezoelectric elements, and there is a gap between the piezoelectric elements and the inner wall of the feedback device housing; The piezoelectric element and the piezoelectric actuator are connected in a one-to-one correspondence, and the piezoelectric actuator provides a driving voltage to the piezoelectric element. An elastomer is arranged circumferentially around the facade of each of the piezoelectric elements, sealing the gaps between the plurality of piezoelectric elements and the gaps between the piezoelectric elements and the inner wall of the feedback device housing; A thin film, which is a flexible thin film, covers the top of the feedback device housing and is fixedly connected to the top of the piezoelectric sheet and the top of the feedback device housing, respectively. A piezoelectric element housing is disposed between the piezoelectric element and the pressure sensor, and is fixedly connected to the feedback device housing; The piezoelectric sheet housing has multiple grooves, each corresponding to a piezoelectric sheet and matching its size; the bottom of the piezoelectric sheet abuts against the bottom of the groove. The piezoelectric element housing includes: The main body includes multiple cylindrical bodies, each with an opening at the top and an inner cavity forming the groove. The first connecting part is fixedly connected between the plurality of cylinders; The inner edge of the second connecting part is fixedly connected to the outer edge of both the main body and the first connecting part, and the outer edge of the second connecting part is fixedly connected to the inner wall of the mounting groove. Both the first connecting part and the second connecting part are connected to the top of the main body.

2. The multi-module vehicle-mounted haptic feedback device based on PVDF piezoelectric thin film according to claim 1, characterized in that, The top of the piezoelectric sheet protrudes from the top of both the first connecting portion and the top of the second connecting portion, and the elastomer simultaneously covers both the first connecting portion and the second connecting portion.

3. The multi-module vehicle-mounted haptic feedback device based on PVDF piezoelectric thin film according to claim 1 or 2, characterized in that, The feedback device housing includes: The supporting body has through holes; An end cap, which is a cylindrical structure with one end open, is coaxially arranged with the through hole, and the inner diameter of the end cap is the same as the diameter of the through hole. The end cap is fixedly connected to the bottom of the supporting body, and the inner cavity of the end cap and the through hole form the mounting groove.

4. The multi-module vehicle-mounted haptic feedback device based on PVDF piezoelectric thin film according to claim 3, characterized in that, The top of the elastomer, the top of the piezoelectric sheet, and the top of the supporting body are flush.

5. The multi-module vehicle-mounted haptic feedback device based on PVDF piezoelectric thin film according to claim 4, characterized in that, The piezoelectric element is a PVDF piezoelectric element.

6. The multi-module vehicle-mounted haptic feedback device based on PVDF piezoelectric thin film according to claim 5, characterized in that, The vibration frequency of the piezoelectric element is set to 50Hz~500Hz.

7. The multi-module vehicle-mounted haptic feedback device based on PVDF piezoelectric thin film according to claim 6, characterized in that, The multiple piezoelectric elements have different vibration frequencies.

8. The multi-module vehicle-mounted haptic feedback device based on PVDF piezoelectric thin film according to claim 7, characterized in that, A pressing area is defined on the film, and the edge of the pressing area coincides with the edge of the overall area composed of the plurality of piezoelectric sheets.

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