Flexible capacitive matrix sensor, pressure detection device, automobile door anti-pinch device and electric automobile with anti-pinch function

Abstract

The utility model provides a flexible capacitive matrix sensor, a pressure detection device, an automobile door anti-pinch device and an electric automobile with an anti-pinch function. The flexible capacitive matrix sensor comprises a top insulating layer, a top conducting layer, an elastic dielectric layer, a bottom conducting layer and a bottom insulating layer which are arranged from top to bottom; and the conductive materials of the two conductive layers are respectively arranged and distributed at intervals in Row rows and Col columns. The pressure detection device comprises a flexible capacitive matrix sensor, a pressure signal processing module for collecting pressure signals and a control module for obtaining pressure distribution data of a sensor module. The automobile door anti-pinch device comprises a pressure detection device, and a flexible capacitance type matrix sensor of the pressure detection device is arranged along an automobile doorsill in an adhering mode. The pressure detection device outputs an anti-pinch instruction according to the pressure distribution data, and the vehicle machine system controls the door closing system to stop closing the vehicle door according to the anti-pinch instruction. The utility model discloses an electric automobile with an anti-pinch function. An automobile door anti-pinch device is arranged on the electric automobile.

Description

Technical Field

[0001] The utility model relates to the technical field of finger pinch prevention in electric vehicles, and in particular to a flexible capacitive matrix sensor, a pressure detection device, a finger pinch prevention device for automobile doors, and an electric vehicle with a finger pinch prevention function. Background Art

[0002] With the continuous advancement of automobile technology and people's increasing attention to car safety, some high-end models are equipped with convenient devices such as electric doors, automatic opening and closing of windows, and one-touch switches, but this also brings the hidden danger of finger pinching accidents, which has prompted the emergence and development of anti-finger pinching technology for car doors.

[0003] Some common car door anti-pinch technology principles:

[0004] The Hall effect anti-pinch method uses Hall elements to identify changes in motor speed or acceleration. When the change reaches a certain threshold, it is assumed that the window is blocked by external force, causing the speed to slow down, thereby triggering the anti-pinch function; for example, the Chinese utility model patent with authorization announcement number CN201314170Y;

[0005] Motor current monitoring: If the motor is obstructed during door closing and the current exceeds a preset value, the anti-pinch protection function will be activated; for example, this method is covered by the Chinese utility model patent with authorization announcement number CN201071654Y.

[0006] The anti-pinch strip method detects changes in resistance value to identify whether the anti-pinch strip is squeezed.

[0007] The above methods all require feedback of some signals after the hand is squeezed, and then the motor can be stopped or turned on again to prevent the hand from being squeezed further. However, they cannot effectively prevent the hand from being pinched.

[0008] The infrared anti-pinch method uses strip infrared detectors installed along the door frame. When the door is opened, the strip infrared detectors activate and when the door is closed, they deactivate. If an object is detected between the door and the vehicle body, the controller disables the door lock, completing the anti-pinch function. This is shown in the Chinese utility model patent with authorization announcement number CN205344778U. However, the infrared detection method has a high detection sensitivity and is easily susceptible to interference and malfunction, which greatly reduces the user experience. Utility Model Content

[0009] The purpose of the utility model is to address the shortcomings of existing products and provide a flexible capacitive matrix sensor, a pressure detection device, an anti-pinch device for automobile doors and an electric vehicle with an anti-pinch function. The anti-pinch device for automobile doors of the utility model can detect object signals when a hand is lightly placed on the surface of the flexible capacitive matrix sensor without applying large pressure, thereby solving the problem that existing products require obvious pressure and deformation to detect objects and cannot judge the hand pinching situation in advance, thereby avoiding the risk of hand pinching during the closing process of the car door.

[0010] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0011] A first aspect of the utility model provides a flexible capacitive matrix sensor, comprising a top insulating layer, a top conductive layer, an elastic dielectric layer, a bottom conductive layer and a bottom insulating layer arranged from top to bottom;

[0012] The conductive materials of the top conductive layer and the bottom conductive layer are arranged in rows horizontally and columns vertically with gaps therebetween. The intersections of the top conductive layer and the bottom conductive layer constitute capacitive sensing points. When a force is applied to the elastic dielectric layer, the change causes a change in the capacitance signal of the sensor matrix plane formed by the capacitive sensing points.

[0013] One end of the conductive material in the horizontal row of the top conductive layer serves as a first electrical signal output end;

[0014] One end of the conductive material in the vertical column Col of the bottom conductive layer serves as a second electrical signal output end.

[0015] Based on the above, it further includes a top protective layer arranged on the top insulating layer, and a bottom protective layer arranged under the bottom insulating layer.

[0016] Based on the above, it also includes an adhesive layer arranged below the bottom protective layer.

[0017] A second aspect of the present invention provides a pressure detection device, comprising a sensor module, a pressure signal processing module and a control module;

[0018] The sensor module adopts the flexible capacitive matrix sensor to sense pressure;

[0019] The pressure signal processing module includes a capacitance acquisition circuit and a multi-channel analog electronic switch;

[0020] The first electrical signal output terminal and the second electrical signal output terminal of the flexible capacitive matrix sensor are respectively connected to the multi-way analog electronic switch, and the multi-way analog electronic switch is connected to the capacitance acquisition circuit;

[0021] The multi-channel analog electronic switch conducts the Row row and Col column of the flexible capacitive matrix sensor in a time-sharing manner, and collects the capacitance signal of each sensing point on the sensor matrix plane through the capacitance acquisition circuit and converts it into a pressure signal;

[0022] The control module adopts an MCU core processor and is connected to the pressure signal processing module to receive the pressure signal from the pressure signal processing module and obtain the pressure distribution data of the sensor module.

[0023] Based on the above, the control module is also connected to an LED indicator light unit and an LCD display unit for displaying the operating status and pressure distribution data of the automobile door anti-pinch device.

[0024] A third aspect of the present utility model provides an automobile door anti-pinch device, comprising the pressure detection device described above;

[0025] The flexible capacitive matrix sensor of the pressure detection device is attached to the door sill to detect whether there is a hand pressing on the door sill;

[0026] The MCU core processor of the pressure detection device is used to output an anti-pinch instruction based on the pressure distribution data and transmit the anti-pinch instruction to the vehicle's on-board system via LIN communication;

[0027] The car's computer system controls the door closing system to stop the door closing action according to the anti-pinch instruction.

[0028] Based on the above, the control module also transmits the pressure distribution data of the sensor module to the vehicle system through LIN communication, and the vehicle system forwards the data to the vehicle screen for display.

[0029] A fourth aspect of the present invention provides an electric vehicle with an anti-pinch function, wherein the electric vehicle is provided with the anti-pinch device for automobile doors.

[0030] Based on the above, the control module of the automobile door anti-pinch device is connected to a switch module;

[0031] When the car door is opened, the switch module controls the pressure detection device to start;

[0032] After the vehicle door is closed, the power on / off module controls the pressure detection device to stop working.

[0033] Based on the above, the switch module is a travel switch arranged at the vehicle door for detecting the switch status of the vehicle door.

[0034] Compared with the existing technology, the present invention has substantial characteristics and progress. Specifically, the present invention can sense the pressure signal when the hand is placed on the surface of the sensor, avoiding the risk that the detection module can only feedback the squeeze signal after being blocked or deformed by force, stopping the door closing action in advance, and avoiding fingers from being pinched. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is an overall effect diagram of the flexible capacitive matrix sensor in Example 1.

[0036] Figure 2 Schematic diagram of the structure of the flexible capacitive matrix sensor in Example 1.

[0037] Figure 3 This is a schematic diagram of the composition structure of the pressure detection device in Example 2.

[0038] Figure 4 This is a circuit schematic diagram of the pressure signal processing module in Example 3.

[0039] Figure 5 This is a circuit schematic diagram of the control module in Example 3.

[0040] Figure 6 Schematic diagram of pressure distribution data under the pressure of the entire palm in Example 3.

[0041] Figure 7 This is a schematic diagram of the flexible capacitive matrix sensor in Example 3 being attached along the side door sill.

[0042] Figure 8 This is a schematic diagram of the flexible capacitive matrix sensor in Example 3 being attached along the rear door sill.

[0043] In the figure: top insulating layer 1; top conductive layer 2; elastic dielectric layer 3; bottom conductive layer 4; bottom insulating layer 5; top protective layer 6; bottom protective layer 7; adhesive layer 8; sensor module 9; pressure signal processing module 10; control module 11; LCD display unit 12. DETAILED DESCRIPTION

[0044] In order to make the implementation purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention is clearly and completely described below.

[0045] Example 1

[0046] This embodiment provides a flexible capacitive matrix sensor, such as Figure 1 and Figure 2 As shown, it includes a top insulating layer 1, a top conductive layer 2, an elastic dielectric layer 3, a bottom conductive layer 4 and a bottom insulating layer 5 arranged from top to bottom;

[0047] The conductive materials of the top conductive layer 2 and the bottom conductive layer 4 are arranged in rows horizontally and columns vertically with gaps therebetween. The intersections of the top conductive layer 2 and the bottom conductive layer 4 constitute capacitive sensing points. When a force is applied, the elastic dielectric layer 3 changes, causing the capacitance signal of the sensor matrix plane formed by the capacitive sensing points to change.

[0048] One end of the conductive material in the horizontal row of the top conductive layer 2 serves as a first electrical signal output end;

[0049] One end of the conductive material in the vertical column Col of the bottom conductive layer 4 serves as a second electrical signal output end.

[0050] The principle of the flexible capacitive matrix sensor of this embodiment for sensing pressure is as follows:

[0051] The top conductive layer 2 and bottom conductive layer 4 are arranged vertically in columns (Col) and horizontally in rows (Row), with an elastic dielectric layer 4 located between them. Capacitive sensing points are formed at the intersections of the top conductive layer 2, elastic dielectric layer 3, and bottom conductive layer 4, forming a total of a Col*Row capacitance sensor array. According to the capacitance calculation formula C=εS / 4πkd (where ε is the relative dielectric constant, S is the area of ​​the capacitor plates facing each other, d is the distance between the capacitor plates, and k is the electrostatic force constant), when subjected to force, the elastic dielectric layer 4 changes, causing the capacitance signal of the capacitive sensing point formed by the top conductive layer 2 and bottom conductive layer 4 to change. This capacitance signal change can be converted into a pressure signal through signal processing.

[0052] In some exemplary embodiments, for isolation protection, the flexible capacitive matrix sensor may further include a top protective layer 6 disposed on the top insulating layer, and a bottom protective layer 7 disposed under the bottom insulating layer.

[0053] In some exemplary embodiments, in order to facilitate pasting, an adhesive layer 8 is further included below the bottom protective layer.

[0054] In some exemplary instances, the spacing between Row and Col columns can be at the mm level. Based on the average finger width of 15mm~20mm for adults and 5mm~10mm for children, the row spacing and column spacing are generally set to 3mm, which can detect most finger presses.

[0055] In some exemplary embodiments, the dielectric layer can be any one of silicone rubber, TPU, and TPE. The conductive layer can be composed of any one or more of graphene slurry, graphite conductive adhesive, silver adhesive, or a mixture of carbon powder / carbon fiber / graphene and elastomer. The insulating layer can be a composite material formed from a blend of cotton, polyester, nylon, and spandex, and silicone, silicone rubber, TPU, or TPE. The specific materials and preparation processes for the conductive and insulating layers are all conventional.

[0056] Example 2

[0057] This embodiment provides a pressure detection device, such as Figure 3 As shown, it includes a sensor module 9, a pressure signal processing module 10 and a control module 11;

[0058] The sensor module 9 adopts the flexible capacitive matrix sensor described in Example 1, and is used to sense pressure;

[0059] The pressure signal processing module 10 includes a capacitance acquisition circuit and a multi-channel analog electronic switch;

[0060] The first electrical signal output terminal and the second electrical signal output terminal of the flexible capacitive matrix sensor are respectively connected to the multi-way analog electronic switch, and the multi-way analog electronic switch is connected to the capacitance acquisition circuit;

[0061] The multi-channel analog electronic switch conducts the Row row and Col column of the flexible capacitive matrix sensor in a time-sharing manner, and collects the capacitance signal of each sensing point on the sensor matrix plane through the capacitance acquisition circuit and converts it into a pressure signal;

[0062] The control module 11 adopts an MCU core processor and is connected to the pressure signal processing module to receive the pressure signal from the pressure signal processing module and obtain the pressure distribution data of the sensor module.

[0063] In some exemplary embodiments, the control module is further connected to an LED indicator light unit and an LCD display unit 12 for displaying the operating status and pressure distribution data of the automobile door anti-pinch device.

[0064] Example 3

[0065] This embodiment provides a car door anti-pinch device, such as Figure 7 and Figure 8 As shown, it includes the pressure detection device described in Example 2;

[0066] The flexible capacitive matrix sensor of the pressure detection device is attached to the door sill to detect whether there is a hand pressing on the door sill;

[0067] The MCU core processor of the pressure detection device is used to output an anti-pinch instruction based on the pressure distribution data and transmit the anti-pinch instruction to the vehicle's on-board system via LIN communication;

[0068] The car's computer system controls the door closing system to stop the door closing action according to the anti-pinch instruction.

[0069] In some exemplary instances, the control module also transmits the pressure distribution data of the sensor module to the vehicle system via LIN communication, which is then forwarded to the vehicle screen to display the shape of the object at the corresponding door position, prompting the driver or passenger to avoid being pinched.

[0070] Figure 4 A circuit schematic diagram of a pressure signal processing module is shown. Figure 4 In the figure, capacitance acquisition circuit U6 is a PMDS-F4 ultra-low-power capacitance measurement chip, capable of collecting real-time capacitance signals from the flexible capacitive matrix sensor via IIC or SPI communication. U1 and U3 are multi-channel analog electronic switches, which control S1 and S0, respectively, to connect the corresponding Col column and Row conductive materials to common terminals 1Z and 2Z in a time-sharing manner. P1 is the signal access port for the Col column and Row rows of the flexible capacitive matrix sensor. The multi-channel analog electronic switch connects the rows and columns of the flexible capacitive matrix sensor in a time-sharing manner, switching in a polling manner. The sampling refresh rate is 50Hz and the fluctuation rate is 0.1pF. The capacitance acquisition circuit U6 collects capacitance signals from each sensing point on the sensor matrix plane and converts them into pressure signals using an internal preset algorithm. It should be noted that this preset algorithm is conventional in the art and utilizes the inherent application functions of the multi-channel analog electronic switch and capacitance acquisition circuit U6. It does not involve any new computer program.

[0071] Figure 5 A circuit schematic diagram of a control module is shown. Figure 5 In the control module, the following components are included:

[0072] The power supply unit composed of U2 and peripheral resistors and capacitors provides stable working power for the flexible capacitive matrix sensor and control module;

[0073] LED indicator light unit and LCD display unit for displaying the operating status and pressure distribution data of the automobile door anti-pinch device;

[0074] The MCU control unit composed of U5 and peripheral devices is used for data analysis, control signal output and communication processing; U1 is an external storage unit that stores sensors and key data; U7 is a LIN communication unit that can realize single-bus communication and simplify the connection lines.

[0075] Figure 6A schematic diagram shows the pressure distribution data of the device under full palm pressure. The control module analyzes the object's shape based on this pressure distribution data and transmits it to the vehicle's screen via LIN communication. The shape of the object at the corresponding door position is displayed, alerting the driver or passenger to avoid pinching.

[0076] Example 4

[0077] This embodiment provides an electric vehicle with an anti-pinch function, and the electric vehicle is provided with the anti-pinch device for automobile doors described in Example 3.

[0078] In some exemplary embodiments, the control module of the vehicle door anti-pinch device is further connected to a switch module. When the vehicle door is opened, the switch module activates the pressure detection device to perform pressure detection. When a hand is detected pressing on the detection area, it outputs an anti-pinch instruction to the vehicle computer system, controls the door closing system to stop the door closing action, and transmits pressure distribution data to the vehicle computer screen for display, prompting the driver or passengers to avoid pinching. After the vehicle door is closed, the switch module controls the pressure detection device to stop working. Specifically, the switch module is a travel switch installed on the vehicle door to detect the door open and close status.

[0079] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A flexible capacitive matrix sensor, characterized in that: It includes a top insulating layer, a top conductive layer, an elastic dielectric layer, a bottom conductive layer and a bottom insulating layer arranged from top to bottom; The conductive materials of the top conductive layer and the bottom conductive layer are arranged in rows horizontally and columns vertically with gaps therebetween. The intersections of the top conductive layer and the bottom conductive layer constitute capacitive sensing points. When a force is applied to the elastic dielectric layer, the change causes a change in the capacitance signal of the sensor matrix plane formed by the capacitive sensing points. One end of the conductive material in the horizontal row of the top conductive layer serves as a first electrical signal output end; One end of the conductive material in the vertical column Col of the bottom conductive layer serves as a second electrical signal output end.

2. The flexible capacitive matrix sensor according to claim 1, characterized in that: The invention also includes a top protection layer disposed on the top insulating layer, and a bottom protection layer disposed under the bottom insulating layer.

3. The flexible capacitive matrix sensor according to claim 2, characterized in that: The invention also includes an adhesive layer arranged below the bottom protective layer.

4. A pressure detection device, characterized in that: It includes a sensor module, a pressure signal processing module and a control module; The sensor module adopts the flexible capacitive matrix sensor according to any one of claims 1 to 3, and is used to sense pressure; The pressure signal processing module includes a capacitance acquisition circuit and a multi-channel analog electronic switch; The first electrical signal output terminal and the second electrical signal output terminal of the flexible capacitive matrix sensor are respectively connected to the multi-way analog electronic switch, and the multi-way analog electronic switch is connected to the capacitance acquisition circuit; The multi-channel analog electronic switch conducts the Row row and Col column of the flexible capacitive matrix sensor in a time-sharing manner, and collects the capacitance signal of each sensing point on the sensor matrix plane through the capacitance acquisition circuit and converts it into a pressure signal; The control module adopts an MCU core processor and is connected to the pressure signal processing module to receive the pressure signal from the pressure signal processing module and obtain the pressure distribution data of the sensor module.

5. The pressure detection device according to claim 4, characterized in that: The control module is also connected to an LED indicator light unit and an LCD display unit for displaying the operating status and pressure distribution data of the automobile door anti-pinch device.

6. A car door anti-pinch device, characterized by: Comprising the pressure detection device according to claim 4 or 5; The flexible capacitive matrix sensor of the pressure detection device is attached to the door sill to detect whether there is a hand pressing on the door sill; The MCU core processor of the pressure detection device is used to output an anti-pinch instruction based on the pressure distribution data and transmit the anti-pinch instruction to the vehicle's on-board system via LIN communication; The car's computer system controls the door closing system to stop the door closing action according to the anti-pinch instruction.

7. The automobile door anti-pinch device according to claim 6, characterized in that: The control module also transmits the pressure distribution data of the sensor module to the vehicle system via LIN communication, and the vehicle system forwards the data to the vehicle screen for display.

8. An electric vehicle with an anti-pinch function, characterized in that: The electric car is provided with the car door anti-hand pinching device according to any one of claims 6-7.

9. The electric vehicle with an anti-pinch function according to claim 8, characterized in that: The control module of the automobile door anti-pinch device is connected to a switch module; When the car door is opened, the switch module controls the pressure detection device to start; After the vehicle door is closed, the power on / off module controls the pressure detection device to stop working.

10. The electric vehicle with the anti-pinch function according to claim 9, characterized in that: The switch module is a travel switch arranged at the vehicle door for detecting the switch state of the vehicle door.

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