Tire Pressure Monitoring System Empolder And Communication-Field Test

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 and high temperature. Based on this, the general design of tire pressure monitoring 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 transmit modules, between which data is transferred by wireless radio frequency. The tire transmit module has the function of the sampling signal and the transmission, and receiver module has the function of receive of wireless signal, process, display and alarm.On the design of system, 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 transmit module is how to reduce the power consumption, minish volume and weight, which include the design of senor, microcontroller and radio frequency transmitter. Especially using accelerating sensor to manage power supply, effectively economizes power consumption. The design of receiver module includes the radio frequency receiver and microcontroller. It effectively improves the reliability and anti-interference ability that adopted 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 and abnormal state's alarm. The wireless transmit adopting checksum way which improve the anti-interference ability of data transmission further.Aiming at the characteristic of bad environment and serious disturbance, many kinds 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 monitoring system. By the systemic analyses, previous test and experiment, it indicates the designed system in this paper has feasibility in theory and technology. Not only can the system meet the demand for NHTSA standard, but also it expands its function, it has certain practical value and applied prospect.