Method for monitoring vehicle speed and load by piezoelectric arrays

Abstract

The invention discloses a method for monitoring the vehicle speed and load by piezoelectric arrays, which is characterized in that two columns of parallel piezoelectric arrays are embedded at intervals along the driving direction of automobiles on the road surface, the two columns of piezoelectric arrays are internally equipped with the same number of piezoelectric aggregate units, the piezoelectric aggregate units in the two columns of piezoelectric arrays are uniformly arranged at intervals and have the same spacing distance, all piezoelectric aggregate units in the piezoelectric arrays areconnected with a signal acquisition system in parallel, and the signal acquisition system is led to a processing system through a data line; the processing system obtains the driving speed of a vehicle according to time parameters; and the load of the vehicle is obtained according to the voltage generated when the vehicle runs over the piezoelectric arrays. The method is used for monitoring the pressure stress of the vehicle for the road surface and the vehicle speed. Compared with the existing piezoelectric sensor, the sensing performance is more sensitive and more stable.

Description

technical field [0001] The invention relates to the technical field of intelligent transportation system monitoring, in particular to a device and method for monitoring vehicle speed and load by a piezoelectric array. Background technique [0002] With the rapid and continuous growth of my country's car ownership, higher requirements are put forward for road traffic management, and intelligent traffic highways emerge as the times require. Vehicle speeding is an important cause of traffic accidents, and vehicle overloading often causes serious damage to roads, so real-time monitoring of vehicle speed and vehicle load is the most important content in the traffic system. At present, commonly used vehicle speed detection technologies at home and abroad include radar, laser, infrared, ultrasonic, etc., and vehicle dynamic weighing systems include strain gauges, capacitive gauges, etc. The above-mentioned technical equipment is expensive, and the vehicle speed and vehicle load ca...

AI Technical Summary

Problems solved by technology

[0005] PZT piezoelectric ceramics have excellent piezoelectric performance, but lead-containing and brittle texture limit their application in smart aggregates

[0006] The huge piezoelectric voltage constant g of PVDF piezoelectric film 33 The PVDF piezoelectric film is successfully applied in the piezoelectric aggregate unit, but the PVDF piezoelectric film has a piezoelectric constant d 33 Smaller disadvantages, only 25pC / N, far less than 450pC / N of piezoelectric ceramics, poor comprehensive piezoelectric performance

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