Tire pressure detection device in tire and electric automobile with tire pressure detection function

Abstract

The utility model provides a tire pressure detection device in a tire and an electric automobile with a tire pressure detection function. The device for detecting the internal tire pressure of the tire comprises a flexible pressure sensor, a pressure signal processing module, a wireless communication module, a self-powered module and a control module, the flexible pressure sensors are arranged in the tire in a global or array mode and used for capturing pressure changes in the tire and converting the pressure changes into electric signals; the pressure signal processing module is used for collecting the electric signal of the flexible pressure sensor, processing the electric signal and converting the electric signal into a pressure signal; the control module is used for receiving the pressure signal and transmitting the pressure signal to an automobile central control screen in a wireless communication mode; and the self-powered module is connected with the pressure signal processing module, the wireless communication module and the control module and is used for providing power. According to the electric automobile with the tire pressure detection function, the tire interior tire pressure detection device is arranged in a tire. The tire pressure detection device can be self-powered and can accurately detect the tire pressure.

Description

Technical Field

[0001] The utility model relates to the technical field of tire pressure detection, in particular to a tire internal pressure detection device and an electric vehicle with the tire pressure detection function. Background Art

[0002] With the rapid development of electric and intelligent vehicles, demands for vehicle safety and comfort are becoming increasingly stringent. Tire pressure is a key factor influencing vehicle safety and comfort. Tire blowouts, due to their unpredictability and uncontrollability, are a major cause of traffic accidents, making tire pressure monitoring increasingly important.

[0003] Currently, automobile tire pressure monitoring primarily involves installing multiple sensors on the inner wall or surface of the tire, using both direct and indirect methods. The direct method involves installing sensors directly on each tire, detecting pressure data in real time and transmitting it to a control unit; for example, see the Chinese utility model patent publication number CN214295422U, entitled Tire Pressure Detection Circuit, Tire Pressure Sensor, and Automobile. The indirect method determines tire pressure by detecting parameters such as wheel speed; for example, the Chinese utility model patent publication number CN213035604U, entitled Tire Pressure Sensor Detection System, uses an acceleration sensor to determine tire pressure by comparing the speed differences between different tires.

[0004] The internal pressure of a car changes dynamically during driving, necessitating large-scale deployment to accurately cover every tire position and reflect its overall condition. However, the diverse range of domestic and international auto brands and wheel specifications necessitate multiple tire pressure monitoring system models, requiring specialized installation. Furthermore, these sensors are expensive, significantly increasing costs for large-scale deployment. Furthermore, these sensors require external power or battery power, resulting in a limited product lifespan, requiring replacement of the internal battery upon discharge. Furthermore, these sensors are susceptible to interference from external light and weather conditions, resulting in low measurement accuracy. Utility Model Content

[0005] The purpose of the utility model is to address the deficiencies of existing products and to provide a tire internal tire pressure detection device that can be self-powered and can accurately detect tire pressure, and an electric vehicle with a tire pressure detection function.

[0006] In order to achieve the above purpose, the technical solution adopted by the present utility model is:

[0007] A first aspect of the present invention provides a tire internal tire pressure detection device, comprising a flexible pressure sensor, a pressure signal processing module, a wireless communication module, a self-powered module, and a control module;

[0008] The flexible pressure sensor is arranged globally or in an array inside the tire to capture pressure changes inside the tire and convert the pressure changes into electrical signals;

[0009] The pressure signal processing module is connected to the flexible pressure sensor and is used to collect the electrical signal of the flexible pressure sensor and convert it into a pressure signal after processing;

[0010] The control module is connected to the pressure signal processing module and the wireless communication module, and is used to receive the pressure signal and transmit the pressure signal to the vehicle central control screen via wireless communication;

[0011] The self-powered module is connected to the pressure signal processing module, the wireless communication module and the control module to provide power.

[0012] Based on the above, the flexible pressure sensor 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;

[0013] 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.

[0014] One end of the conductive material in the horizontal row of the top conductive layer serves as a first electrical signal output end;

[0015] One end of the conductive material in the vertical column Col of the bottom conductive layer serves as a second electrical signal output end.

[0016] 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.

[0017] Based on the above, it also includes an adhesive layer arranged below the bottom protective layer.

[0018] Based on the above, the pressure signal processing module includes a capacitance acquisition circuit and a multi-channel analog electronic switch;

[0019] The first electrical signal output terminal and the second electrical signal output terminal of the flexible pressure 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;

[0020] The multi-channel analog electronic switch conducts the Row row and Col column of the flexible pressure sensor in a time-sharing manner, and collects the capacitance signals of each sensing point on the sensor matrix plane through the capacitance acquisition circuit and converts them into pressure signals.

[0021] Based on the above, the self-powered module includes a self-generating sheet, a switch module and an energy storage module;

[0022] The self-generating sheet is a piezoelectric vibrating sheet that generates electricity by vibration or friction, or a thermoelectric generating sheet that generates electricity by temperature difference;

[0023] The energy storage module includes a rectifier circuit and an energy storage capacitor, and the rectifier circuit converts the stray AC energy collected by the self-generating sheet into DC energy to charge the energy storage capacitor;

[0024] The control module is provided with a micro-power charging capacitor and a bootstrap capacitor connected to the self-generating chip for providing power to the control module;

[0025] The control module is further provided with a voltage detection circuit connected to the energy storage module for detecting the energy storage voltage of the energy storage module;

[0026] The self-generating chip is connected to the energy storage module via the switch module, and the control module controls the connection of the switch module to control the switch module to be turned on to charge the energy storage capacitor when the control module detects that the energy storage voltage is less than a set voltage lower limit threshold, and to control the switch module to be turned off to stop charging the energy storage capacitor when the energy storage voltage is greater than an upper voltage limit threshold;

[0027] The energy storage module is used to provide power for the pressure signal processing module and the wireless communication module.

[0028] Based on the above, the switch module is a MOSFET switch.

[0029] Based on the above, the rectifier circuit is a rectifier bridge composed of four Schottky barrier diodes.

[0030] Based on the above, the wireless communication module adopts SI24R1.

[0031] A second aspect of the present invention provides an electric vehicle with a tire pressure detection function, wherein the tire internal tire pressure detection device is arranged inside the tire of the electric vehicle.

[0032] The present invention has substantial features and advancements over the prior art. Specifically:

[0033] 1. The tire internal tire pressure detection device provided by the present invention has flexible pressure sensors distributed inside the tire, which can convert the tire pressure signal into an electrical signal output. Moreover, since the flexible pressure sensors are distributed and installed inside the tire, the pressure information of each part of the tire can be globally monitored, realizing all-round and accurate monitoring.

[0034] 2. The internal tire pressure detection device provided by the utility model collects and stores energy from the mechanical vibration or friction heat generated by the tire during driving through a piezoelectric vibrating plate, and supplies power to the internal tire pressure detection device, avoiding the use of an external power supply. This ensures that the internal tire pressure detection device does not require battery replacement for a long time, thereby reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a circuit principle block diagram of the tire internal tire pressure detection device in Example 1.

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

[0037] Figure 3 This is a circuit schematic diagram of the pressure signal processing module in Example 1.

[0038] Figure 4 This is a circuit schematic diagram of the self-powered module in Example 1.

[0039] Figure 5 This is a circuit schematic diagram of the control module in Example 1.

[0040] Figure 6 This is a circuit diagram of the wireless transmission device in Example 1.

[0041] Figure 7 1 is a flowchart of the working process of the tire internal tire pressure detection device in Example 1.

[0042] 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. DETAILED DESCRIPTION

[0043] 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.

[0044] Example 1

[0045] This embodiment provides a tire internal tire pressure detection device, such as Figure 1 As shown, it includes a flexible pressure sensor, a pressure signal processing module, a wireless communication module, a self-powered module and a control module;

[0046] The flexible pressure sensor is arranged globally or in an array inside the tire to capture pressure changes inside the tire and convert the pressure changes into electrical signals;

[0047] The pressure signal processing module is connected to the flexible pressure sensor and is used to collect the electrical signal of the flexible pressure sensor and convert it into a pressure signal after processing;

[0048] The control module is connected to the pressure signal processing module and the wireless communication module, and is used to receive the pressure signal and transmit the pressure signal to the vehicle central control screen via wireless communication;

[0049] The self-powered module is connected to the pressure signal processing module, the wireless communication module and the control module to provide power.

[0050] Flexible pressure sensor

[0051] Specifically, such as Figure 2 As shown, the flexible pressure sensor 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;

[0052] 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.

[0053] One end of the conductive material in the horizontal row of the top conductive layer 2 serves as a first electrical signal output end;

[0054] 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.

[0055] The principle of the flexible pressure sensor in this embodiment for sensing pressure is:

[0056] 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.

[0057] In some exemplary embodiments, for isolation protection, the flexible pressure sensor may further include a top protective layer 6 disposed above the top insulating layer, and a bottom protective layer 7 disposed below the bottom insulating layer.

[0058] In some exemplary embodiments, in order to facilitate pasting, an adhesive layer 8 is further included below the bottom protective layer.

[0059] In some exemplary embodiments, the spacing between Rows and Cols can be at the mm level to fully detect the tire pressure status.

[0060] 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.

[0061] Pressure signal processing module

[0062] The pressure signal processing module includes a capacitance acquisition circuit and a multi-channel analog electronic switch; the first electrical signal output end and the second electrical signal output end of the flexible pressure sensor are respectively connected to the multi-channel analog electronic switch, and the multi-channel analog electronic switch is connected to the capacitance acquisition circuit; the multi-channel analog electronic switch time-sharingly conducts the Row row and Col column of the flexible pressure sensor, and collects the capacitance signals of each sensing point on the sensor matrix plane through the capacitance acquisition circuit and converts them into pressure signals.

[0063] Figure 3 A circuit schematic diagram of a pressure signal processing module is shown. Figure 3In 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.

[0064] Self-powered modules

[0065] The self-powered module is as follows Figure 4 As shown, it includes a self-generating chip, a switch module and an energy storage module.

[0066] The self-generating sheet is a piezoelectric vibrating sheet that generates electric energy by vibration or friction, or a thermoelectric generating sheet that generates electric energy by temperature difference. Preferably, the self-generating sheet can be made of PZT-5H. The energy storage module includes a rectifier circuit and an energy storage capacitor, and the stray AC energy collected by the self-generating sheet is converted into DC energy by the rectifier circuit to charge the energy storage capacitor. The self-generating sheet is connected to the energy storage module through the switch module, and the switch module is controlled by the control module. When the control module detects that the energy storage voltage of the energy storage module is less than the set voltage lower limit threshold, the switch module is turned on to charge the energy storage capacitor. When the energy storage voltage is greater than the voltage upper limit threshold, the switch module is disconnected to stop charging the energy storage capacitor;

[0067] The energy storage module is used to provide power for the pressure signal processing module and the wireless communication module.

[0068] Preferably, the switch module is a MOSFET switch to ensure the voltage safety of the self-powered module. The rectifier circuit is a rectifier bridge composed of four Schottky barrier diodes.

[0069] Control Module

[0070] The control module adopts MCU core processor, Figure 5A circuit schematic diagram of a control module is shown. The control module is connected to the self-generating chip and is used to provide power to the control module via a micro-power charging capacitor and a bootstrap capacitor. The control module also has a voltage detection circuit connected to the energy storage module for detecting the energy storage voltage of the energy storage module.

[0071] Wireless communication module

[0072] Figure 6 This figure shows a circuit schematic for a wireless transmission device. The wireless communication module uses the SI24R1. The SI24R1 is a low-power wireless transmission device used to send pressure signals to the vehicle's central control screen, ensuring real-time data transmission while effectively reducing overall device power consumption and avoiding transmission anomalies caused by loose wired transmission interfaces.

[0073] like Figure 7 As shown, the working principle of the utility model is as follows:

[0074] During vehicle operation, the self-powered module generates voltage through vibration and friction, part of which is fed into the control module to ensure it can stably issue control signals. When the control module detects that the energy storage voltage is less than the set lower voltage threshold, it controls the switch module to conduct and charge the energy storage capacitor. When it detects that the energy storage voltage is greater than the upper voltage threshold, it disconnects the switch module to stop charging the energy storage capacitor. When the energy storage voltage is less than the set lower voltage threshold, the switching process repeats to ensure the stability and reliability of the device. The energy storage module provides stabilization for the pressure signal processing module and the wireless communication module. The flexible pressure sensor outputs the pressure signal as an electrical signal and transmits it to the pressure signal processing module. The pressure signal processing module provides a sampling signal to the wireless communication module. The wireless communication module transmits the collected signal to the vehicle's central control screen to detect tire pressure.

[0075] Example 2

[0076] This embodiment provides an electric vehicle with a tire pressure detection function, and the tire internal tire pressure detection device described in Example 1 is arranged inside the tire of the electric vehicle.

[0077] 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 tire internal tire pressure detection device, characterized in that: It includes a flexible pressure sensor, a pressure signal processing module, a wireless communication module, a self-powered module and a control module; The flexible pressure sensor is arranged globally or in an array inside the tire to capture pressure changes inside the tire and convert the pressure changes into electrical signals; The pressure signal processing module is connected to the flexible pressure sensor and is used to collect the electrical signal of the flexible pressure sensor and convert it into a pressure signal after processing; The control module is connected to the pressure signal processing module and the wireless communication module, and is used to receive the pressure signal and transmit the pressure signal to the vehicle central control screen via wireless communication; The self-powered module is connected to the pressure signal processing module, the wireless communication module and the control module to provide power.

2. The tire internal pressure detection device according to claim 1, characterized in that: The flexible pressure sensor comprises 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.

3. The tire internal pressure detection device according to claim 2, 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.

4. The tire internal pressure detection device according to claim 3, characterized in that: The invention also includes an adhesive layer arranged below the bottom protective layer.

5. The tire internal pressure detection device according to any one of claims 1 to 4, characterized in that: 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 pressure 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 pressure sensor in a time-sharing manner, and collects the capacitance signals of each sensing point on the sensor matrix plane through the capacitance acquisition circuit and converts them into pressure signals.

6. The tire internal pressure detection device according to any one of claims 1 to 4, characterized in that: The self-powered module includes a self-generating sheet, a switch module and an energy storage module; The self-generating sheet is a piezoelectric vibrating sheet that generates electricity by vibration or friction, or a thermoelectric generating sheet that generates electricity by temperature difference; The energy storage module includes a rectifier circuit and an energy storage capacitor, and the rectifier circuit converts the stray AC energy collected by the self-generating sheet into DC energy to charge the energy storage capacitor; The control module is provided with a micro-power charging capacitor and a bootstrap capacitor connected to the self-generating chip for providing power to the control module; The control module is further provided with a voltage detection circuit connected to the energy storage module for detecting the energy storage voltage of the energy storage module; The self-generating chip is connected to the energy storage module via the switch module, and the control module controls the connection of the switch module to control the switch module to be turned on to charge the energy storage capacitor when the control module detects that the energy storage voltage is less than a set voltage lower limit threshold, and to control the switch module to be turned off to stop charging the energy storage capacitor when the energy storage voltage is greater than an upper voltage limit threshold; The energy storage module is used to provide power for the pressure signal processing module and the wireless communication module.

7. The tire internal pressure detection device according to claim 6, characterized in that: The switch module is a MOSFET switch.

8. The tire internal pressure detection device according to claim 6, characterized in that: The rectifier circuit is a rectifier bridge composed of four Schottky barrier diodes.

9. The tire internal pressure detection device according to any one of claims 1 to 4, characterized in that: The wireless communication module adopts SI24R1.

10. An electric vehicle with a tire pressure detection function, characterized in that: The tire internal tire pressure detection device according to any one of claims 1 to 8 is arranged inside the tire of the electric vehicle.

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