TPMS系统CAN总线接口

文档编号:DQ144   文档字数:12867,页数:30

摘  要

 轮胎是汽车的重要部件，其可靠性对汽车行驶安全具有重要意义。全世界每年因轮胎故障所引发的交通事故占很大比例。研究表明轮胎气压是造成轮胎故障的重要原因是轮胎气压不足或超标，仅会增大耗油、减少轮胎乃至整车寿命，更会造成严重的爆胎事故，因此保持标准的车胎气压和及时发现车胎漏气是防止轮胎故障和爆胎的关键。
 TPMS足汽车轮胎压力监视系统“Tire Pressure Monitoring System”的英文缩写形式，主要用于，汽车行驶实时的对轮胎进行自动检测．对轮胎漏气和低气压进行报警．以保障行车安全。TPMS属于主动型安全系统，可在轮胎出现危险征兆时及时预警，从而将事故消灭在萌芽状态。相对于汽车ABS、EDS、EPS等被动型安全系统，TPMS有更好的避灾性。近年来全球TPMS市场需求正在快速增长，对TPMS的研发已成为汽车电子产品设计的重点。TPMS主要有两种实现方式，即间接式(Wheel—Speed Based)TPMS和直接式(Pressme—SensorBased)TPMS，这两种系统各具特点。

关键词：轮胎压力监视；直接式；报警；安全系统

Abstract

 Tires is an important component of motor vehicles, the reliability of steam: vehicles of great significance to safety. Worldwide each year due to tire failure caused by a large proportion of traffic accidents. Research indicates that tire pressure is an important reason for tire failure: inadequate or excessive tire pressure only increases fuel consumption, reduce tire life as well as vehicles, this may result in serious accidents puncture, the tire pressure to maintain standards and to detect flat tires to prevent tire failures and the key blow.
 TPMS Tire Pressure adequate monitoring system "Tire Pressure Monitoring System" form of the letters used, Car tire of the real-time automatic detection. On a flat tire and the low pressure alarm. In order to protect the traffic safety. TPMS are active safety systems, tires can be dangerous warning signs in time, so that the accident nipped in the bud. Compared with the vehicle ABS, EDS, EPS, such as passive safety systems, TPMS better avoid sex. Global market demand for TPMS in recent years is the rapid growth of research and development of TPMS automotive electronics have become the focus of product design. TPMS There are two main ways, namely indirect (Wheel-Speed Based) TPMS and direct (Pressme-SensorBased) TPMS, which have the characteristics of the two systems.
Keywords: Tire pressure monitoring; Direct; Alarm; Security systems.

目 录
摘要…………………………………………………………………………………………………..I
Abstract………………………………………………………………………………………………. II
1 绪论………………………………………………………………………………………..…..….1
2 总体方案设计…………………………………………………...………………………….…..2
2.1 系统总体功能分析……………………………………………………………….……………2
2.2 系统总体软件流程……………………………………………………………………….…....3
2.3 CAN总线概述…………………………………………………………………….……4
2.4 轮胎模块设计…………………………………………………………………….……5
2.5 直接式TPMS…………………………………………………………………….……5
3 信号发射系统原理………………………………………………………………………..…...7
 3.1 RF传输协议………………………………………………………..…………….……….7
 3.2 LF传输协议…………………………………………..……………..………………7
 3.3 发射模块基本程序流程………………………………………..……………..………………8
4 TPMS的工作原理原理…………………………………………………………..….……….…..10
 4.1 基于CAN总线的的轮胎自动定位…………………………………….…………………...10
 4.2 TPMS的试验方法研究………………………………………………………….………...…11
        4.2.1  TPMS的低压报警功能………………………………………...………………..…11
        4.2.2  TPMS的压力探测精度……………………………………………………….……12
        4.2.3 TPM的耐压性………………………………………………..….………….13
        4.2.4 TPMS的温度报警功能………………………………………………..….………….13
        4.2.5 TPMS的寿命……………………………………………………..….………….14
        4.2.6 TPMS的耐旋转加速度性能…………………………………………..….………….14
        4.2.7 TPMS的耐湿度影响……………………………………………..….………….15
        4.2.8 TPMS对不同安装方式传感器的要求………………………………..….………….15
        4.2.9 TPMS的电磁兼容性……………………………………………..….………….15
 4.2.10 TPMS的耐低温性……………………………………………………..….………….15
 4.3  TPMS的未来展望……………………………………………………………….………...…16
5 结论……………………………………………………………………………..………….……17
致 谢………………………………………………………………………………..…………….……19
参考文献…………………………………………………………………………………………....…19
附 录1：国外对TPMS传感器对环境的适应性要求…………………………..………20
附 录2：系统总图………………………………………………………………..………21
附 录3：系统程序………………………………………………………………..………21

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