Automobile tire monitoring device based on organic piezoelectric material

A piezoelectric material, automobile tire technology, applied in tire measurement, tire parts, vehicle parts, etc., can solve problems such as failure to meet actual use, requirements, and patents are rarely applied.

Inactive Publication Date: 2011-05-25
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because its reliability, stability and sensitivity are far from meeting the requirements of actual use,

Method used

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  • Automobile tire monitoring device based on organic piezoelectric material
  • Automobile tire monitoring device based on organic piezoelectric material
  • Automobile tire monitoring device based on organic piezoelectric material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Embodiment 1: the concrete structure of probe

[0053] The tire 1 used in the experiment is an ordinary car tire with an outer diameter of 60 cm and a tread width of about 20 cm. For the specific probe structure, see figure 1 , The probe base support 3 is a rubber plate with a size of 35cm in length, 18cm in width and 5mm in thickness. The piezoelectric film 4 is a PVDF piezoelectric film with an area of ​​2cm×2cm, a thickness of 100μm, and a piezoelectric constant d 33 =21pC / N, aluminum electrodes are coated on both sides of the film. The action unit 5 is a table tennis ball with a diameter of 4 cm. The piezoelectric film 4 is attached to the center of the probe base support 3, and the rubber film 6 is a balloon membrane, which fixes the action unit on the probe base support 3, and the action unit 5 is fixed in the middle of the piezoelectric film. When the standard air pressure in the tire, the bottom of the rubber film 6 is 1 cm away from the inner surface of the...

Embodiment 2

[0054] Embodiment 2: Piezoelectric signal conversion and processing circuit

[0055] Such as image 3 As shown, the integrating capacitance 17 of the charge amplifier 7 is 4700pF, and the resistance value of the feedback resistor 16 is 3.3MΩ. The resistors 19, 21 and the adjustable resistor 20 in the preamplifier 8 are 12kΩ, 110kΩ and 200kΩ respectively. In the peak holding circuit 9, the resistor 25 is 10kΩ, the voltage holding capacitor 26 is 0.1μF, and the rectifier diodes 23 and 24 are 1N4148. The transistor 28 of the reset circuit 11 is 2SC1815, and the emitter resistor 29 is 1kΩ. image 3 The operational amplifiers 15, 18, 22, and 27 used in each signal processing circuit in the circuit have selected a general-purpose low-noise high-precision operational amplifier OP-07. Such as figure 2 The shown temperature sensor 13 uses a platinum thermistor, the single-chip microcomputer 12 uses AT89C52, and the wireless transceiver module 14 selects 24L01, and the single-chip ...

Embodiment 3

[0057] Example 3: Design of a single-supply charge amplifier

[0058] The experimental design of a single-supply charge amplifier such as Figure 5 As shown, the single-supply operational amplifier 33 is LM358, the resistor 31 is 130kΩ, the integral capacitor 32 is 1000pF, the Zener diode 30 is 1N4746A, the filter resistor 34 and filter capacitor 35 are 130kΩ and 0.1μF respectively. The supply voltage for the circuit is 15V and ground (0V).

[0059] Similarly, at an ambient temperature of 15°C, when the excitation frequency f is about 1.67 Hz, the voltage output of the single-supply charge amplifier changes with the action distance x of the action unit 5 as follows: Figure 8 As shown, (a), (b), (c) and (d) in the figure correspond to the situations when x=0, 3mm, 9mm and 15mm respectively. Figure 9 The relationship curve of the peak value of the charge amplifier U with the operating distance x is based on Figure 8 The waveform voltage signal U waveform is obtained from t...

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Abstract

The invention belongs to the field of automotive electronic measurement, and in particular relates to an automobile tire monitoring device based on an organic piezoelectric material. The automobile tire monitoring device consists of a probe in a tire, a circuit part in the tire (slave) and a main control circuit part, wherein, the probe is formed by matching a PVDF (polyvinylidene fluoride) film with a specific support. In the invention, change of the operating distance x in the case of under-pressure of the automobile tire during the running process is converted into pressure and deformation acting on the PVDF film through the probe so as to generate a piezoelectric signal for reflecting the status of the tire; and meanwhile, data correction based on multi-physical quantity is carried out on an induction signal, and then the signal is transmitted in a wireless communication manner, so that the monitoring system can effectively measure and estimate the tire pressure in real time, and can also judge truly dangerous situations of the tire, such as air leakage and under voltage, and give an alarm.

Description

technical field [0001] The invention belongs to the field of automobile electronic measurement, and in particular relates to an automobile tire monitoring device based on an organic piezoelectric material. technical background [0002] Tires are an important part of a car, and their performance will directly affect the driveability, comfort, stability and safety of the car. According to a recent survey by the American Society of Automotive Engineers, 75% of tire failures each year are caused by tire leakage or insufficient inflation; according to statistics from the Ministry of Public Security, 70% of traffic accidents on Chinese highways are caused by tire problems. Therefore, it is the key to solve the above problems to be able to monitor the status of the tires, especially the tire pressure in real time, so that the tires can be found leaking in time when the car is running, so as to maintain the standard tire pressure. [0003] It can be seen that the research and devel...

Claims

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Application Information

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IPC IPC(8): B60C23/04
Inventor 张涛韩冰李陈孝黄东岩胡天立
Owner JILIN UNIV
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