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Automotive tire pressure monitoring method based on tyre impedance and apparatus thereof

A pressure monitoring, automobile tire technology, applied in tire measurement, tire parts, vehicle parts, etc., can solve problems such as affecting the elasticity and stiffness of tire treads, difficulty, etc., to avoid dynamic loads, anti-electromagnetic interference and heat resistance. The effect of good performance and cost reduction

Inactive Publication Date: 2009-01-21
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the conventional tire pressure sensor can be omitted in this way, various troubles that arise when installing a conventional sensor are avoided, but when the tire pressure is measured wirelessly by using the tire capacitive impedance and the CR oscillator, the measurement signal needs a power supply when it is transmitted. Generally, a high-performance lithium battery is used for power supply, so this tire condition measurement method still has various problems in using battery power supply. In addition, the CR oscillator and transmitter are composed of electronic components such as resistors and amplifiers, and are embedded in the tread. Difficult and will affect the tire's tread elasticity and stiffness after installation

Method used

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  • Automotive tire pressure monitoring method based on tyre impedance and apparatus thereof
  • Automotive tire pressure monitoring method based on tyre impedance and apparatus thereof
  • Automotive tire pressure monitoring method based on tyre impedance and apparatus thereof

Examples

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Embodiment 1

[0036] The embodiment of the automobile tire pressure monitoring device based on tire impedance can be as figure 1 The shown at least one tire module 2 is composed of an outer module 1 . The tire module 2 located in different tires includes a surface acoustic wave resonator 4 embedded in the steel wire layer rubber of the tire tread, a steel wire connected thereto, a near-end antenna and a matching impedance. The surface acoustic wave resonator 4 is composed of a substrate 3 and an interdigital transducer on the surface of the substrate 3 and two identical reflectors, and the reflectors are completely symmetrically arranged on both sides of the interdigital transducer. One end of the interdigital transducer of the surface acoustic wave resonator 4 is connected with the matching impedance, and this end is also connected with the near-end antenna in addition, and the other end of the interdigital transducer of the surface acoustic wave resonator 4 is connected with the tread ste...

Embodiment 2

[0049] In this embodiment, by embedding a plurality of surface acoustic wave resonator groups 5 inside the tire, not only the pressure, temperature, wear and aging information of the tire can be obtained at the same time, but also the tire pressure can be calculated according to the obtained tire pressure, temperature, wear and aging information. The correct judgment of the security status.

[0050] The structure of the external module 1 of this embodiment is the same as that of Embodiment 1, and the structure of its tire module 2 is more complex than that of Embodiment 1, that is, each tire module 2 is mainly composed of a surface acoustic wave resonator group 5, a near-end antenna and a matching impedance. . The surface acoustic wave resonator group 5 is formed by connecting two surface acoustic wave resonators 4 with exactly the same structure. A near-end antenna is also connected between the surface wave resonator 4 and the matching impedance. One of the other two ends o...

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Abstract

The invention discloses an automobile tire pressure monitoring method based on tire impedance and a device thereof, which embeds a surface acoustic wave resonator into the interior of a tire and takes a capacitor and a resistor of the tire formed by tire rubber and steel wires as external connection impedance load of the surface acoustic wave resonator. The change of the state of the tire leads to the change of the tire impedance; the change of the tire impedance leads to the change of the resonance frequency of the surface acoustic wave resonator; the surface acoustic wave resonator can generate resonance in virtue of external exciting pulses to passively and wirelessly send resonance frequency signals out, thus realizing the wireless and passive detection of the state of the tire. In the detection process of the state of the tire, different steel wires are connected with a plurality of different surface acoustic wave resonators to form a plurality of surface acoustic wave resonators with different external connection load impedances and the combination of the resonance frequency of a plurality of surface acoustic wave resonators realizes the detection of the states of the tire such as pressure, temperature, abrasion, aging, etc.

Description

(1) Technical field: [0001] The invention relates to a method and a device for monitoring safe driving of an automobile, in particular to a method and a device for monitoring the pressure of an automobile tire based on tire impedance. (two) background technology: [0002] In the driving of a car, tire burst is the most worrying and most difficult to prevent for all drivers, and it can cause or induce serious traffic accidents. Especially when running at high speed, tire burst will be more dangerous. Safety experts pointed out that when the speed of the car exceeded 160 kilometers per hour, the death rate caused by tire burst was almost close to 100%. According to theoretical analysis, before the tire bursts, the tire pressure will be abnormal, so the danger caused by the tire burst can be fundamentally avoided by monitoring the tire pressure and alarming the abnormal situation. In addition, if the inflation pressure of the tire is insufficient, the rolling resistance of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C23/00
CPCB60C23/0428
Inventor 张向文许勇潘明樊永显
Owner GUILIN UNIV OF ELECTRONIC TECH
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