Positioning transmit device and method of automobile tire temperature and pressure monitoring system

Abstract

The invention provides a positioning transmit device and method of an automobile tire temperature and pressure monitoring system (TPMS). The positioning transmit device comprises a microprocessor, two acceleration sensors, a tire temperature and pressure sensor, an ASK emitting chip and an antenna matching filter circuit which are arranged on the hub of an automobile tire, wherein the acceleration measuring axes of the acceleration sensor I and the acceleration sensor II coincides with the radial line of the hub, and the acceleration measuring axes and the radial line all point to the same direction. By using the device and method of the invention, the influence of metal components such as the tire steel nets and the automobile body on the radio-frequency signals sent by the transmit device of the TPMS can be effectively overcome. The principle of the invention is simple and is easy to realize, thus the data transmission quality of the TPMS can be increased and the transmission power of the transmit device in the tire can be reduced. Therefore, the bit error rate performance of the TPMS can be greatly improved and the market competition of the TPMS product can be increased.

Description

technical field [0001] The invention relates to a data transmission device of a direct automobile tire temperature and pressure wireless monitoring system (TPMS). The invention also relates to a data transmission method of a direct type automobile tire temperature and pressure wireless monitoring system. Background technique [0002] Car tire temperature and pressure monitoring system (TPMS) is crucial to safe driving. At present, TPMS is mainly divided into two types [1] : Indirect TPMS and direct TPMS. The indirect TPMS uses the ABS tire speed sensor to measure the rotation speed of the tire to judge the tire pressure, and its accuracy and reliability are poor. The direct TPMS system can automatically monitor the tire pressure and temperature in real time while the car is driving, and can play an early warning and ensure driving safety effects, so it has gradually become the mainstream of the market [2] . However, the temperature and pressure sensor module of the direc...

AI Technical Summary

Problems solved by technology

However, the temperature and pressure sensor module of the direct TPMS needs to be installed inside the tire to transmit tire information wirelessly. Due to the shielding effect of the steel mesh in the tire and the hub, when it is used in a large vehicle, the transmitting module and the receiving module often appear due to the long distance. In some tire positions, the sensor data transmission is not reliable enough. In order to solve the above problems, the present invention proposes a technical solution for controlling the positioning and emission of the emission module in the tire, and describes its control mechanism and system modeling method in detail. implementation algorithm

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