Capacitive miniature tire pressure sensor

A pressure sensor, micro-tire technology, applied in tire measurement, tire parts, transportation and packaging, etc., can solve the problems of not meeting the new technology standards and requirements of energy saving and environmental protection, environmental pollution, and limited life, and achieve convenient The effect of collaborative work and information fusion, improved reliability and maintainability, and improved interchangeability

Inactive Publication Date: 2013-02-13
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The active tire pressure sensor needs a built-in battery to provide energy, and its volume and weight are relatively large. It is inconvenient to install, has a limited life, and has a single function. Replacing

Method used

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  • Capacitive miniature tire pressure sensor
  • Capacitive miniature tire pressure sensor
  • Capacitive miniature tire pressure sensor

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Example Embodiment

[0032] The present invention will be further described in detail below in conjunction with specific embodiments, which are for explanation rather than limitation of the present invention.

[0033] See Figure 1 ~ Figure 4 The present invention is a capacitive miniature tire pressure monitoring sensor that can be implanted into the tire to work. The sensor has a three-layer plate structure. The upper plate is made of a convex multi-layer composite elastic film for sensitivity to external pressure. Capacitance electrodes are fabricated on the multilayer film and the support plate for pressure measurement. A wireless communication antenna and a surface acoustic wave device are integrated on the lower floor, which together complete energy coupling and information transmission. After the external signal enters the antenna coupling, an oscillation effect is generated on the surface acoustic device to obtain the working energy required by the sensor. The capacitance between the cup-sh...

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Abstract

The invention discloses a capacitive miniature tire pressure sensor. The capacitive miniature tire pressure sensor comprises an upper plate, a supporting plate and a lower base plate, a multi-layer compound film sensitive to pressure is installed on the upper plate, a capacitive upper pole plate is installed in the multi-layer compound film; the upper surface of the supporting plate is provided with a capacitive lower pole plate, and detection capacitance is formed by the capacitive upper pole plate and the capacitive lower pole plate; and the lower base plate is provided with a surface acoustic wave component and a miniature antenna which is connected with the surface acoustic wave component in coupled mode, and the surface acoustic wave component comprises piezoelectric materials and two groups of interdigital electrodes, wherein one group of interdigital electrodes are connected with the miniature antenna, and the other group of interdigital electrodes are respectively connected with the capacitive upper pole plate and the capacitive lower pole plate. The capacitive miniature tire pressure sensor can be embedded inside a tire to work, achieves measurement and result transfer of tire pressure in passive and wireless mode, and has the advantages of being small in size, light in weight, low in cost, and free of maintenance.

Description

technical field [0001] The invention belongs to the technical field of tire pressure sensors and relates to a capacitive miniature tire pressure sensor. Background technique [0002] The tire pressure monitoring system monitors changes in tire pressure and prevents tire blowout accidents through early warning, so as to protect the stability of the vehicle and the safety of the drivers and passengers. The tire pressure monitoring sensor is the core component of the whole system, and its working performance directly determines the accuracy and reliability of the monitoring system. According to the configuration, the tire pressure sensor can be divided into two types: active type and passive type. Active sensors need to be powered by batteries to meet the energy needs of the sensor; passive sensors rely on external energy coupling to work. [0003] At present, the tire pressure sensors commercially available in the market are all active types, that is, the pressure sensor, po...

Claims

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Application Information

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IPC IPC(8): B60C23/04
Inventor 王小章张群明王朝晖郑腾飞
Owner XI AN JIAOTONG UNIV
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