Research And Development Of Tire Pressure Real-time Monitoring And Prewarning System

The paper summarizes domestic and international developing actuality and characteristic of tire pressure monitoring system, and analyses the pressure and temperature impacts on the performance of tires. At the result the safe operation of the tires is mainly affected by low pressure, high pressure or high temperature. Based on this, the general design of tire pressure real-time monitoring and prewaming system is presented, and the basic function and performance is listed.In the whole the system is made of one receiver module and four tire modules, between which data is transferred by wireless radio frequency. The tire module has the function of the sampling signal and the transmission, and receiver module has the function of receive of wireless signal, process, alarm and human-machine interaction.On the design of the hardware and software, modularization technique is adopted. In the hardware design, some integrated electronic devices fitting for automobile's environment are used. The main design purpose of tire module is to reduce the power consumption, and minish volume and weight, which include the design of the senor, microcontroller and radio frequency transmitter. Especially using accelerating switch to manage power supply effectively economizes power consumption. The design of receiver module includes the one of radio frequency receiver, microcontroller and human-machine interaction. It effectively improves anti-interference ability and the reliability that adopt the many-to-one and one-direction wireless communication way of FSK digital frequency modulation.Software is made up of the modules of the sample of the pressure and the temperature of the tire, the wireless transmit and receive of the data, the data process, alarm and human-machine interaction. According to the change of sampling pressures, the one of two operation ways is selected, which solve the contradiction between power consumption and accuracy and real-time of data; The wireless transmit adopting CRC check-up way improve the anti-interference ability of data transmission further; Mistake operation are effectively reduced by software design of system configuration by keys.Aiming at the characteristic of bad environment and serious disturbance, manykinds of software and hardware technology, especially the PCB (Printed Circuit Board) design of radio frequency, are applied to improve systematic anti-interference ability, which comprehensively improve systematic dependability and practicability.The thesis synthetically manages the senor technology, microcontroller technology, and wireless communication technology, software engineering, etc., and designs the prototype of tire pressure real-time and prewarning system. Though the systemic analyses, previous test and experiment, it indicates the designed system in the paper has feasibility in theory and technology. Not only can the system meet the demand for NHTSA standard, but also it expands its function, which has simple and practical human-machine interaction ability. So the system has certain practical value and applied prospect.