本文针对采用逻辑加密卡的燃气表安全保护措施缺乏，加密性差等问题，采用模块化的设计方法，进行基于CPU卡的燃气表系统设计，完成CPU卡接口模块，ESAM模块，显示模块的硬件电路设计及CPU卡的内部认证，外部认证等系统软件的开发，实现智能燃气表与CPU卡的信息交换、液晶显示、阀门关断、流量检测、燃气费用计算以及预付费等功能，提高了燃气表用户数据的安全性
In this paper, aiming at the problem that the gas meter, equipped with logic encryption cards, lacked safety protection measures and poor encryption, a CPU-card-based gas meter was designed with the help of modular design method. The hardware included CPU card interface circuit, ESAM module circuit and LCD display circuit. The software mainly included internal authentication and external authentication. The whole system realized the information exchanging between gas meter and CPU card , information display with LCD ,valve control，gas flow checking, gas costs calculation and prepayment. User data of the gas meter was well improved.
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