中文摘要：

采用在发动机进气管路上串联一个自主设计的单向线圈式电磁阀的方法，利用单片机开发了一种汽车用键盘式密码防盗系统。通过判断多功能转向盘上数字键盘输入的开启密码的正确与否来控制发动机气路的开闭，从而实现汽车防盗的功能。利用开发的单片机实验板对防盗系统进行了试验。该密码防盗系统安全可靠、价格低廉、隐蔽性好，能有效降低汽车的被盗率。

英文摘要：

By using a self-- designed one-- way 2. Nanchang University, Nanchang, 330031 coil solenoid valve in the engine intake pipe,and u sing SCM a password security system of a car was developed with the keyboard and type. Through in- stalling digital keyboard multi--function steering wheel, the car open password was inputted and judged to be correct or not then to control opening and closing of the engine gas path, so as to achieve the vehicle anti--theft feature. Simulating the security system with the developed SCM slabs, the ex- perimental results show that the password security system is safe and reliable, inexpensive, easy to conceal, and can effectively reduce the rate of car theft.