Battery-free automobile tire pressure monitoring transmitter capable of freely moving in tire

Abstract

The invention belongs to the field of automobile spare parts, and discloses a battery-free automobile tire pressure monitoring transmitter capable of freely moving in a tire. The battery-free automobile tire pressure monitoring transmitter comprises a shell, a kinetic energy collecting device, an electric generation device and a circuit board; the shell is composed of two hollow hemispheres, and an air vent is formed in the outer wall; the kinetic energy collecting device is used for collecting rolling kinetic energy, jolting and vibration kinetic energy, shaking kinetic energy or ground touching impact kinetic energy coming from the inner wall of the tire; the electric generation device converts the kinetic energy to alternating current electric energy in an electromagnetic induction electric generation mode; the circuit board comprises a tire pressure monitoring chip and an antenna, and further comprises an energy storage element, a rectifier charging device, a linear voltage regulator and an electric energy detector. Through four links of kinetic energy collecting, kinetic energy releasing, electric generation and charging and electricity supplying, the technical problems in multiple aspects of electricity supplying for the tire pressure monitoring chip are solved, and a plurality of optimized specific implementation plans are provided according to different kinetic energy collecting modes; and according to the battery-free automobile tire pressure monitoring transmitter capable of freely moving in the tire, the structure is simple, reliability is high, using is simple,the cost is low, and market competitiveness is high.

Description

technical field [0001] The invention belongs to the field of auto parts, and relates to a battery-free automobile tire pressure monitoring transmitter capable of free movement in tires. Background technique [0002] Existing automotive tire pressure monitoring transmitters usually have two types, built-in and external, and are generally installed on the tire valve. The tire pressure data is transmitted to the matching display control device or the car center console through narrow-band wireless transmission. Usually, a button battery (such as CR2450) is used for power supply. Due to the limited capacity of the button battery, users need to replace the expensive high-temperature resistant battery regularly. Judging from the current situation, the battery replacement cycle of mid-range priced built-in products is about 2 to 3 years, and it is very inconvenient to change the tires and do dynamic balancing. Some products integrate a high-capacity battery on the sensor, which ca...

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Problems solved by technology

[0004] The common point of the above patents is that a certain part of the power generation equipment is fixed on the wheel or a certain part of the vehicle in some form, and most of them have certain requirements for installation, and the dynamic balance of the tire needs to be adjusted after installation; in addition These patents generally have some problems of low power generation efficiency. For example, the technology of using piezoelectric ceramics for power generation has the problems of easy damage to piezoelectric ceramics, low power generation voltage, and low current; there are technical defects in using a fan fixed inside the tire to drive the motor to generate power. , because when the tire rotates at high speed, the internal air and the tire move almost synchronously, and the relative wind speed is very small. When driving at a constant speed on the highway, it may not be able to generate enough electric energy; it is possible to charge by receiving WIFI signals or other radio frequency signals. , but the energy of WIFI signal and wireless radio frequency is too small, this technology still has a long way to go before it can be practical, if there is no WIFI signal, it may lose its function; There is a scheme in which the coil cuts the magnetic force line through the coil rotating with the tire at high speed to generate electricity. Although the electromagnetic power generation method with high power generation efficiency is adopted, due to the excessive distance between the magnet and the coil and the current offset effect formed by the magnet rotating outside the coil, The power generation efficiency is actually not high. In addition, the high heat of the brake (the high temperature generated by the brake friction or the high temperature generated by the direct sunlight of the brake iron material in summer) can also demagnetize the magnet.

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