中文摘要：

针对现有电子式防盗设备易误报,而芯片式和网络式防盗系统成本高、维护难等缺陷,设计了一种基于单片机的沙滩车密码防盗系统。该系统由自锁电磁开关阀及其驱动电路、ISD4004语音模块、液晶显示系统和矩阵键盘密码输入系统组成。核心部件——自锁电磁开关阀,串联在发动机的进气管路中,通过判断输入密码是否正确来控制阀的启闭,从而确定发动机的启闭。测试结果表明：该系统成本低、可靠性好,能够有效防盗。

英文摘要：

Aiming at main defects,such as the misdescription of existing electronic anti-theft devices,high cost and troublesome maintenance of chip type and network type anti-theft systems. In this paper,we design a passwordantitheft system for ATV based on singlechip. This system consists of a self-locking solenoid switch valve with its driving circuit,an ISD4004 voice module,a liquid crystal display and matrix keyboard-password input panel. The core component,self-locking solenoid switch valve,is embedded into the engine＇ s inlet pipe. By judging whether the input password is correct or not,the opening and the closing of the control valve are determined,and so do the opening and the closing of the engine. Experimental results show that this system is of low cost and good reliability,and can effectively guard against theft.