《基于MC9S12XS的ABS控制器设计》-毕业论文.doc

PAGE PAGE 1 毕 业 设 计（论 文） 题 目： 基于MC9S12XS的ABS控制器设计 系 别： 电气工程系 专 业： 自动化 班 级： T723-3 学生姓名： 学 号： 20070230310 指导教师：  摘要 随着我国汽车工业的迅猛发展，人们开始日益重视道路交通安全问题，防抱死制动系统是一种在汽车制动时能够自动调节车轮制动力，防止车轮抱死，以取得最佳制动效果的制动系统，（AntiLock Brake System）简称ABS。该系统可以显著提高或改善汽车紧急制动时的操控性和稳定性，缩短汽车制动距离，是一种新型的电控产品，并得到越来越广泛的应用。本文以轿车为研究对象，展开对汽车ABS控制器ECU的研究。本文首先对ABS的发展状况进行了概述，解释了ABS系统的控制原理，在此基础上详细介绍了ABS的结构以及各部分的作用。接下来对ABS控制算法进行了研究，主要对传统的逻辑门限值方法进行研究，同时对ABS的核心部件电子控制单元（ECU）进行了设计研究。对整个ABS的控制过程和逻辑进行了分析，设计了ABS中央控制器。用16位单片机开发研究ABS是目前广泛采用的方法， 本文以飞思卡尔公司的MC9S12XS单片机为核心设计ABS 系统ECU控制器，包括信号输入电路，控制输出电路，驱动显示电路等硬件部分。最后本文对ABS系统的发展进行了展望，并对毕业设计做了总结。 关键词：防抱死系统；ECU；逻辑门限值；MC9S12XS单片机 ABSTRACT With the rapid development of Chinas automobile industry, people began increasing emphasis on road safety issues, anti-lock braking system is able to automatically adjust the braking wheel braking force, to prevent the wheels from locking the brake in order to obtain the best results braking system, referred to as ABS. ABS systems can significantly enhance or improve vehicle control during emergency braking and stability, reduce the vehicle braking distance, is a new type of electronic control products, and get more and more widely used. In this paper, as the research object bus to start the car ABS study. Firstly, the development of the ABS were reviewed to explain the ABS system control theory, on this basis, the structure of ABS described in detail as well as the role of the various parts. Next to the ABS control algorithm is studied, the main logic of the traditional threshold method is used. This paper also core components of ABS electronic control unit (ECU) were studied. ABS control of the whole process and logic is analyzed. ABS is designed central controller. ABS with single chip research and development is a widely used method. In this paper, to Freescales microcontroller core MC9S12XS always control system. Including the signal input circuit, the control output circuit, drive circuit and other hardware