Expandable multi-tyre TPMS system

Abstract

The invention relates to patulous multiple tyres TPMS system that comprises emitter, antenna, main controller, and code card cage, code module, when said main controller is started or repositioned, reading ID code of all code module, and storing corresponding relationship between the ID code and tyre identity; sensor of said emitter converts the change of tyre pressure and temperature to corresponding changeable electric parameters via electronic element, and emitted by the emitting circuit after process; wireless signal is received by antenna, and decode by modulation and demodulation circuit, then data is transferred to main controller CPU via the SPI bus, the CPU saves data to corresponding area according to corresponding relationship of tyre identification, and displays data in corresponding data area. Comparing with current technique, the invention possesses characters that the performance is stable, and it is easy to be realized, and convenient to be expanded.

Description

technical field [0001] The invention relates to an automobile tire pressure detection system (TPMS system), in particular to an expandable multi-tyre TPMS system. Background technique [0002] The Tire Pressure Monitoring System (TPMS) is mainly used to automatically monitor the tire pressure when the car is running, and to give early warning to low tire pressure caused by tire leakage and high temperature and high tire pressure. Ensure driving safety. [0003] There are currently two main types of TPMS, one is TPMS based on wheel speed (WSB TPMS, indirect TPMS), this system uses the wheel speed sensor of the automobile ABS system to compare the speed difference between the tires to monitor the tire pressure The main disadvantage of this type of system is that it cannot judge the situation of two or more tires being out of air at the same time and the speed exceeding 100 km / h; the other is the TPMS based on the pressure sensor (PSB TPMS, direct TPMS) , this system uses the...

AI Technical Summary

Problems solved by technology

[0005] 1) The tire working environment is harsh and the average working hours are long;

[0006] 2) The normal air pressure value is not fixed;

[0007] 3) For different models, the number of tires and wheelbase will change accordingly; especially the phenomenon that the same front is often connected to different trailers (such as containers, etc.)

This solution is relatively simple, but the disadvantage is that it cannot be installed in the wrong place during use, otherwise the identity recognition will be confused. At the same time, if a transmitter module is damaged, the user must go to the manufacturer to solve the problem; reinstall the location

Disadvantages: Since the identification ID code length is 16 or 32 digits, the input process is complicated, and users are prone to code group input errors

Disadvantages: 1. Four LF antennas need to be installed near the corresponding tires, and the installation and wiring workload is heavy; 2. The LF signal may mistakenly trigger the adjacent emission detection module 3. Due to the complex electromagnetic environment on the car, there are various This kind of interference will cause interference to low-frequency signals and cause identification failure

[0024] f. The I / O port reads the ID code, wastes system resources, does not apply to multiple tires, and has poor scalability

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