A self-powered device for a vehicle positioning and tracking system

Abstract

The present invention relates to a self-powered device for a vehicle positioning and tracking system which belongs to the field of piezoelectric power generation. An end cover is mounted on a shell body, and a boss of the end cover is provided with a fixed magnet; two ends of a square guide post are respectively embedded on the end cover and the shell body; a support spring, a mass block and a limiting spring orderly sleeve the square guide post from bottom to top; V-shaped grooves are arranged on a left side and a right side of the mass block, moving magnets are arranged on an upper side and a lower side of the mass block, a circuit board is mounted on a first lower boss of a bottom wall of the shell body, and a fixed magnet is mounted on a second lower boss; an ear plate of the shell body is provided with a piezoelectric vibrator and a spring sheet. A free end of the piezoelectric vibrator is provided with a butting block, the butting block is butted against the spring sheet, and the free end of the spring sheet is inserted into the V-shaped grooves; opposite magnetic poles of the moving and fixed magnets are installed opposite to each other. Advantageous features of the self-powered device are that a piezoelectric sheet is only under compressive stress and is protected by the support spring and the limiting spring, high reliability is realized, the self-powered device is suitable for large amplitude and high intensity vibration; system fundamental frequency is determined by the spring stiffness and the mass block, amplitude and frequency increase can be achieved via the moving and fixed magnets, and therefore low-frequency and broadband energy recovery can be realized.

Description

technical field [0001] The invention belongs to the field of automotive electronics technology and piezoelectric power generation technology, and in particular relates to a self-power supply device for a vehicle positioning and tracking system. Background technique [0002] Car positioning and navigation systems have been widely used in real life, but their functions are single, mainly to guide drivers to their destinations. From the perspective of practical application, the vehicle positioning and tracking system can also realize functions such as real-time monitoring and reporting of vehicle speed, automatic alarm of major traffic accidents, or tracking of vehicle theft. Since the existing positioning system is powered by the engine, the positioning system will not be able to continue to work when the engine is powered off or fails; in addition, the existing positioning systems are all external, can be artificially closed or destroyed, and cannot be used for speed monitor...

AI Technical Summary

Problems solved by technology

For this reason, various forms of piezoelectric and electromagnetic vibration power generation devices have been proposed. However, due to structural principles or device characteristics, the existing vibration power generation devices have relatively high natural frequencies and cannot well adapt to low frequencies and large amplitudes. Vehicle environment

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