泊车辅助系统超声波倒车警报装置毕业设计（论文）.doc

摘要 倒车警报装置又称泊车辅助系统，是汽车泊车安全辅助装置，能以直观的显示告知驾驶员周围障碍物的情况，解除了驾驶员泊车和起动车辆时前后左右探视所引起的困扰，并帮助驾驶员扫除了视野死角和视线模糊的缺陷，提高了安全性。一般由超声波传感器（俗称探头）、控制器和显示器等部分组成，现在市场上的倒车警报装置大多采用超声波测距原理，驾驶者在倒车时，启动倒车警报装置，在控制器的控制下，由装置于车尾保险杠上的探头发送超声波，遇到障碍物，产生回波信号，传感器接收到回波信号后经控制器进行数据处理，判断出障碍物的位置，由显示器显示距离并发出警示信号，得到及时警示，从而使驾驶者倒 车时做到心中有数，使倒车变得更轻松。倒车警报装置的提示方式可分为液晶、语言和声音三种；接收方式有无线传输和有线传输等。本文介绍了以STC89C51单片机为核心的一种低成本、高精度、微型化，并有数字显示和声光报警功能的倒车警报装置系统。 关键词：倒车警报装置，超声波，STC89C51单片机 The reversing alarm device, also known as the parking assist system, car parking security assistive devices. Intuitive display to inform the driver of obstacles around the lifting of the distress caused by the driver parking, and start the vehicle around visitation,and help the driver to remove the defects of vision corners and blurred vision. Increased security by the ultrasonic sensors (commonly known as probes), controller and display part. Reverse warning device on the market now mostly used ultrasonic distance measurement principle, driving in reverse, start reversing alarm devices under the control of the controller,means transmitting an ultrasonic probe at the rear bumper. Encounters an obstacle, generating an echo signal the sensor echo signal is received by controller data processing to determine the position of the obstacle, the distance is displayed by the display and alertsignal to obtain timely warning, so be aware of the driver when reversing. Reversing easier.Reversing warning device LCD, language, and voice prompts can be divided into three types; receiving wireless transmission and cable transmission. This article describes the STC89C51 microcontroller as the core of a low-cost, high-precision, miniaturization, and a digital display of sound and light alarm function the reversing alarm device system. Keywords: the reversing alarm devices, ultrasonic, STC89C51 microcontroller  目录 摘要 I Abstract II 第一章 绪论 1 1.1 研究现状 1 1.2 发展前景 1 第二章 超声波倒车警报系统简介 2 2.1 单片机的概述 2 2.1.1 单片机的特点 2 2.1.2 单片机的开发工具 2 2.2 超声波的简介与应用 3 第三章 系统构成及工作原理 5 3.1 系