摘要
随着高速公路的发展和汽车性能的提高，汽车行驶速度越来越快，特别是由于汽车拥有量的迅速增加，交通越来越拥挤，使得事故更为频繁，所以汽车的安全性就变得尤为重要。汽车的安全性分为主动安全和被动安全两种，主动安全是指汽车防止发生事故的能力，主要有操纵稳定性、制动性能、平顺性等，被动安全是指在万一发生事故的情况下，汽车保护乘员的能力，目前主要有安全带、安全气垫、防撞式车身和安全气囊防护系统(Airbag Restraint System，简称安全气囊)。由于现实的复杂性，有些事故是难以避免的，因此被动安全性也非常重要，安全气囊作为被动安全性的研究成果，由于使用方便、效果显著、造价不高，所以得到迅速发展和普及。
故设计的主要工作是对气囊电路中的CPU、加速度传感器的选择、继电器的选择及与电路有关的器件，如为防止错点火而要设计一个点火电路、为防止信号干扰我们要加光隔离等一些措施。所以我设计所做的主要工作就是对安全气囊的硬件电路实行操作并对其汽车碰撞时的工作原理进行分析，对其应用进行研究。
关键词：安全气囊、保护、加速度传感器、汽车碰撞。

Abstract
汽车的安全气囊With the development and car expressway, the improvement of the performance of vehicle driving faster, especially because of the car ownership is increasing rapidly, traffic more and more crowded, making more frequent accidents, so cars safer becomes especially important. Auto safety is divided into active and passive safety two kinds, active safety refers to the ability of car prevent accidents, mainly handling stability and brake performance, smooth, passive safety means such as in case the case of an accident, car protect the ability of crews at present, the main have safety belt and safety cushions, impact-proof type body and airbags protection system (Airbag Restraint System）, abbreviation airbags). Due to the complexity of the reality, some accident is unavoidable, so passive security is also very important, airbags as passive safety research results, because use a convenient and effective, cost is not high, so get rapid development and popularization.
The main reason design work is the CPU to balloon circuit, accelerometer selection, relay selection and related devices with circuit, such as to prevent wrong ignition and want to design a ignition circuit, to prevent signal interference we should add some measures such as light isolation. So I design main work is the hardware circuit for airbag operation and its implement the working principle of vehicle is analyzed, and its application in research.
Keywords: Airbags, protection, acceleration sensor, automobile collisions.