Piezoelectric sensor based on vehicle dynamic weighing array

Abstract

The invention discloses a piezoelectric sensor based on a vehicle dynamic weighing array. The piezoelectric sensor comprises a weighing unit, a sensing unit and a remote control unit, wherein the sensing unit comprises a first piezoelectric sensor group, a second piezoelectric sensor group and a transverse pressure sensor group, the weighing unit comprises a foundation pit and a weighing plate, the bottoms of the first piezoelectric sensor group and the second piezoelectric sensor group are fixedly connected with the top of a stabilizing plate, the transverse pressure sensor group comprises afirst pressure sensor positioned on a first mounting plate on the left side of the foundation pit and a second pressure sensor positioned on a first mounting plate on the right side of the foundationpit, the remote control unit receives an electric signal of the first piezoelectric sensor group or the second piezoelectric sensor group as a measurement result value according to a preset first intermediate variable value, and the remote control unit receives an electric signal of the light pressure measuring sensor and / or the heavy pressure measuring sensor as a measurement result value according to a preset second intermediate variable value.

Description

technical field [0001] The present invention relates generally to the field of highway weighing, and more particularly to a piezoelectric sensor based on a vehicle dynamic weighing array. Background technique [0002] A piezoelectric sensor is a sensor based on the piezoelectric effect, a self-generating and electromechanical conversion sensor. Its sensitive element is made of piezoelectric material. When a piezoelectric material is subjected to a force, an electric charge is generated on its surface. After the charge is amplified by the charge amplifier and the measuring circuit and the impedance is transformed, it becomes an electric output proportional to the received external force. Piezoelectric sensors are used to measure force and non-electrical quantities that can be converted into electricity. Its advantages are wide frequency band, high sensitivity, high signal-to-noise ratio, simple structure, reliable operation and light weight. The disadvantage is that som...

AI Technical Summary

Problems solved by technology

The disadvantage is that some piezoelectric materials need moisture-proof measures, and the output DC response is poor, and high input impedance circuits or charge amplifiers need to be used to overcome this defect

[0003] When weighing vehicles on the expressway, piezoelectric sensors are generally used for weighing. Generally, a foundation pit is dug on the ground, and a weighing device with a piezoelectric sensor is installed in the foundation pit for weighing. The prior art In the middle, due to the large gap between the weighing plate and the foundation pit on the ground, when it is used for a long time, a large number of stones will enter these large gaps, and it will accumulate over the years, which will affect the piezoelectric sensor inside the foundation pit. Normal use, and there is easy rainwater accumulation inside the foundation pit, which affects the service life of the piezoelectric sensor

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