Signal transmitting device with air tap tire gauge

Abstract

The invention discloses a signal transmitting device with an air tap tire gauge, wherein the tire gauge comprises a circuit board with a signal transmitting circuit and a casing for packaging the circuit board; the transmitting device comprises a tire pressure detection circuit, the transmitting circuit, a cylindrical coil and an air tap, wherein the tire pressure detection circuit is used for detecting the pressure in a tire and converting the pressure into an electric signal; the transmitting circuit is fixed on the circuit board and is used for converting the electric signal into a signal to be transmitted; one end of the cylindrical coil is electrically connected with the transmitting circuit for receiving the signal to be transmitted and transmitting the signal to be transmitted to the outer space per se; the other end of the cylindrical coil is electrically connected with the air tap to be used as an impedance matched element to transmit the signal to the air tap; and the air tap is universally connected with a tire gauge casing and is used for transmitting the signal to be transmitted to the space. The air tap can be used as a main antenna and the cylindrical coil not only can play a role of impedance matching, but also can be used as a slave antenna to assist the air tap in signal transmission.

Description

【Technical field】 [0001] The invention relates to automobile security auxiliary equipment, in particular to a signal transmitting device for a tire pressure gauge with an air nozzle. 【technical background】 [0002] It is common knowledge in the art that the tire pressure gauge of the automobile tire is connected with the air nozzle to form an independent product for sale. See the patent documents of various countries in the world including the applicant's patent (application) for the relevant technological evolution. [0003] There are generally two ways for the tire pressure gauge to transmit signals to the space outside the tire. One is to put an antenna on the circuit board of the tire pressure gauge as the product implemented by the applicant, and directly transmit electrical signals to the outside of the tire through the antenna. As we all know, the steel wire mesh is densely covered in the tire, and the steel wire mesh together with the hub forms a shielding cavity, w...

AI Technical Summary

Problems solved by technology

In this case, the signal inside the tire is led out of the tire and is no longer easily shielded. However, once water enters the air nozzle and the air nozzle is integrated with the hub, the signal transmission cannot be sent normally due to a short circuit.

And because the relatively large resistance of the gas nozzle affects the signal transmission power and the feed point of the signal to the gas nozzle, it is difficult for this product to be fully recognized by consumers in the market at present.

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