摘 要：随着时代发展和科技进步，汽车数量的增多交通事故发生的数量也越来越多，而其中汽车轮胎压力正常与否成为重要因素。据汽车工程师学会统计,美国每年由于轮胎欠压以及渗漏造成的有26万左右起交通事故。而在中国这原因也高达有大约70％。所以,对汽车爆胎的监测和解决方法已成为安全驾驶的重要发展方向,而其中确保轮胎有着正常合适的胎压是解决的这个问题的重中之重。在这次汽车检测电路设计中，系统检测部分采用了气压传感器MPX4250芯片检测车轮胎压，实现汽车轮胎胎压模拟信号输入。采用了LCD016L构成了显示模块，显示车轮胎压值。与此同时，系统检测汽车胎压是否在国家规定限值内，若超出限定值，系统通过声音报警，提醒驾驶者注意检查，提高汽车安全性。通过Proteus软件仿真表明，实现了汽车胎压检测以及胎压不正常情况下警告提醒。95056

毕业论文关键词：汽车胎压，监测，气压传感器

Abstract: With the time development and progress of science and technology, the number of cars increases the number of traffic accidents happen more and more, and become important factors of automobile tire pressure is normal or not。 Each year, according to automotive engineers to the United States due to tire under-voltage and there are about 260000 traffic accident caused by leakage。 But in China the reason also up to about 70%。 So for car flat tire monitoring and solution has become an important development direction, safe driving and the tire has a normal proper tire pressure is the key of the solve this problem。 In the vehicle detection circuit design, system testing part adopts the pressure sensor MPX4250 chip checkout automobile tire pressure, automobile tire pressure analog signal input。 Adopted LCD016L constitutes the display module, display car tire pressure values。 At the same time, the system detects whether automobile tire pressure within the limits prescribed by the state, if beyond the limit, system by sound and light alarm and alert the driver check, increasing the safety of the car。 Through the Proteus software simulation shows that the automobile tire pressure detection and sound and light warning that tire pressure is not normal circumstances, reaches the curriculum design task requirement。

Key words: The automobile tire pressure, monitoring, pressure sensor

目   录

1 引言 4

1。1课题产生背景及其意义 4

1。2问题的提出 4

1。3任务与分析 5

2  系统方案设计 5

2。1系统设计方案 5

2。2系统总体框图 6

3 系统硬件设计 7

3。1 AT89C52单片机 7

3。2 ADC0832 芯片 11

3。3  MPX4250 气压传感器 12

4系统硬件电路构成 13

4。1 气压传感器电路 13

4。2 LCD显示电路 14

4。3声音报警电路 15

5 系统软件设计 15

5。1软件环境介绍 16

5。2系统软件分析 17

5。3 程序流程图 17

5。4软件计算胎压值