Automobile passive tire pressure monitoring instrument

Abstract

The invention discloses a passive automobile tire pressure monitoring instrument based on piezoelectric self power generation. The passive automobile tire pressure monitoring instrument is characterized in that a piezoelectric energy collecting module adopts a modularized integrated unit circuit mode, a bridge rectifier circuit, a capacitor filtering energy accumulation circuit, a voltage stabilizing circuit and a DC-DC unit circuit are integrated inside the piezoelectric energy collecting module, and a power supply monitoring and managing system comprises a control switch, a power status monitoring chip and a microprocessor control unit; a piezoelectric vibration self power generation device utilizes vibration and extrusion of external environment to generate alternating current electric energy, the alternating current electric energy is subjected to rectification, filtering, voltage stabilization and DC-DC voltage change inside the piezoelectric energy collecting module, is stored by an electrical energy storage device, and then is supplied to a tire pressure sensor and a tire pressure signal transmitting module. The power supply monitoring and managing system is arranged for improving the working reliability of the system, the problems of power supply and management of the tire pressure sensor and the tire pressure signal transmitting module are effectively solved, the working reliability of the system is improved and the passive automobile tire pressure monitoring instrument has energy-saving and environment-friendly effects.

Description

technical field [0001] The patent of the present invention relates to the field of automotive electronics, in particular to a passive monitor for automotive tire pressure based on piezoelectric self-generation. Background technique [0002] What the patent of the present invention relates to is the third automobile safety electronic product of foreign legislation after the anti-lock braking system (ABS) and the safety air bag. At present, the car accidents caused by blown tires occupy the top of the list of expressway accidents, and blown tires have become one of road traffic killers. As the "nemesis" of tire blowouts, TPMS (Tire Pressure Monitoring System) can timely and accurately alarm tires with abnormal air pressure through real-time automatic monitoring of tire pressure in driving vehicles, thereby preventing vehicle loss of control and tire blowouts. It is reported that the TPMS standard formulated by the National Automobile Standardization Technical Committee at the...

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Problems solved by technology

[0004] The technical problem to be solved by the patent of this invention is: the common problem in the industry that the sensor in the tire of the car tire and the wireless transmitting device are not easy to supply power, and a solution for the passive monitoring of the car tire pressure based on piezoelectric self-generation is provided

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