智能IC卡燃气表系统设计.doc

摘 要 社会生活节奏的日趋加快，人工上门查记燃气表的工作量大,效率低,恶意拖欠燃气费的用户使燃气公司损失很大。针对这些情况，并随着科技的发展以及智能IC卡的出现，本文设计了IC卡预付费型燃气表。燃气用户在燃气公司开户,购买一定气量后,即得到加密的IC卡。用户用气时将卡插入燃气表中,卡中气量自动输入燃气表并在IC卡中消除气量,供气阀门打开。当气量不足时,燃气表提示用户购气；气量用完时,燃气表自动切断供气管路。这种IC卡燃气表是一种多功能的表，有别于普通的燃气表。该表在显示流量的同时，还可以用PID算法对其流量加以控制，体现其智能性。 本设计在实现对燃气流量控制的同时，又可以固定流量加以显示，而当流量小于某一值时，就报警。本设计采用MCS-51系列单片机中的89C51为CPU，当IC卡插入后，燃气开通，传感器会将检测到的流量以电流的形式送入I/V变换器，得到相应的电压信号，该信号经A/D转换后，以数字量的形式存于CPU单元中，该量与设定值间一定存在差值，通过PID调节后，将信息送入CPU，由它发出指令信号推动执行机构带动调节阀控制燃气流量的大小，如此反复多次控制后，最终可实现设计的相关参数。 关键词IC卡流量Abstract Community to speed up the growing pace of life, artificial gas meter-site investigations in mind the heavy workload, low efficiency, malicious user fees owed the gas company Gas great loss. With the development of technology, a pre-paid IC card-type gas meter, gas users in the gas company to open an account, purchase a certain volume, that is encrypted by the IC card. Gas users will insert the gas card table, cards in the air and automatically enter gas meter in the IC card in the elimination of gas, and gas supply valve to open. When the gas shortage, the gas meter prompts the user to purchase gas; exhausted gas, gas meter automatically cut off gas supply pipeline. In view of this, the paper design of the smart IC card gas meter. The IC card is a gas meter multi-purpose table, unlike an ordinary gas meter. The table shows that traffic, it is also PID algorithm can be used to control its flow, reflect their intelligence and the IC card has played the role of switches, IC card on behalf of a management information, it can be written to reflect a password or Card peoples thinking. Implementation of this design in the gas flow control at the same time, traffic can be fixed, and when the flow is less than a certain value, on the alarm. This design uses MCS-51 series in 89 C51 microcontroller for the CPU, when the IC card is inserted after the opening of gas, the sensor will detect the current to flow into the form of I / V converters, the corresponding voltag