Surface transverse fluctuation mode tire pressure sensor

Abstract

The invention relates to a surface transverse fluctuation mode tire pressure sensor in the technical field of mechanical sensors, which comprises a shell, a cover plate, a cantilever beam supporting base and a pressure-sensitive quartz cantilever beam element, wherein the shell is in sealed connection with the cover plate, and the cantilever beam supporting base and the pressure-sensitive quartz cantilever beam element are fixed in the shell respectively. A single-port resonator on the pressure-sensitive quartz cantilever beam element works in a surface transverse fluctuation mode. The surface transverse fluctuation mode tire pressure sensor has the advantages of mechanical vibration resistance, impact resistance, fatigue resistance and high stress sensitivity, and is suitable for the requirement on tire pressure measurement of which the measurement range is between 0 and 1 MPa without adjustment.

Description

technical field [0001] The invention relates to a device in the technical field of mechanical sensors, in particular to a surface transverse wave (STW) mode tire pressure sensor. Background technique [0002] Major traffic accidents are easily caused by car tire blowouts on expressways. If the internal pressure of the tire is too low, the tire will be deformed and the sinkage of the tire will increase. Therefore, due to the increase in friction, the temperature of the tire will rise sharply, which will cause the tire to become soft. , the intensity decreases. In addition, the overheating state will accelerate the aging and deformation of the steel wire and rubber of the radial tire, and even cause the internal fracture of the tire. These factors may produce a blowout accident. During the driving of the car, due to the deformation of the tire, the shoulder wear will be aggravated and irregular wear will appear. In addition, due to the increased friction between the tires a...

AI Technical Summary

Problems solved by technology

[0005] There are following shortcoming in the tire pressure sensor in the prior art: SAW intelligent tire pressure sensor adopts Rayleigh wave pattern work almost entirely, and its shortcoming is that Q value (quality factor) is not high, to the defect (scratch, twinning crystal) of wafer surface , pores) are very sensitive, have poor resistance to surface pollution (dust, oil, water vapor), and poor aging characteristics; the force transmission mechanism and elastic components are all made of crystal cup structure, not only narrow range, but also low pressure sensitivity. The thickness of the diaphragm is difficult to process uniformly, resulting in asymmetric strain distribution of the diaphragm, poor linearity, poor pressure overload capability, and poor consistency; pressure-force transducers and force transmission structures are all made of metal with pressure sensors The package box and the convex structure on the box, the elastic coefficient and temperature coefficient of the metal box cover convex structure are usually not equal to the elastic coefficient and temperature coefficient of the elastic element body and the sensitive device (both of which are made of quartz crystal material). Mismatches of the components tend to produce "slippage between force-conducting and elastic media" and "thermal stresses within sensitive devices"

[0006] After searching the existing patent literature, it is found that the patent application number 200810200032.0 describes a "surface acoustic wave pressure sensor using a composite mode", which uses a new type of cantilever with a sweeping body wave mode and a cylindrical force-conducting cylinder with a blind hole The beam structure has made great improvements to the above problems, but because the thickness of the pressure sensor is thicker, the overall size is larger

In addition, the structure is complex, and this technology is suitable for high-precision pressure sensors, but not suitable for ordinary pressure sensors with large quantities and wide areas.

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