本科毕设论文--付费式热能计量与控制系统.docVIP

摘 要 城镇供暖是生活环境质量的重要指标之一，将直接影响到城镇居民的日常生活。近年来，由于实施分户热收费的迫切需要 Abstract Heating is an important indicator of urban environmental quality of life , will directly affect the daily life of urban residents . In recent years , due to the urgent need to implement household calorie charges , to design a prepaid -type heat measurement and control system is necessary. This paper designs energy measurement and control system based on AT89S52 microcontroller . DN20 through DS18B20 temperature sensors and flow sensors , temperature , flow data directly to the microcontroller . Energy consumption values ??calculated according to the formula , and the LCD display shows consumption, balance , temperature , time, and other relevant information, the system is provided with a voice warning prompt. Microcontroller output signal through the D / A, V / I circuit , the output signal is transmitted to the electric control valve, control valve opening , to regulate the indoor temperature purposes. Remote meter reading and users via the CAN bus and non-contact IC card prepaid module functions . System data stored in memory chips AT24C04A, prevent data loss. Calorimeter prepaid heating system can not only solve measurement problems in heat consumption , but also greatly improve the accuracy and timeliness , to eliminate errors, omissions and other problems heating billing for scientific , timely, accurate and reasonable conduct civil heating systems heat billing, charging , control provides effective tools . Keywords : Prepaid ; Energy Metering ; Remote Meter Reading 目 录 第1章 绪论 5 1.1 课题来源与实际应用意义 5 1.2 国内外发展现状 6 1.3 系统的设计目标和要求 8 第2章 系统方案设计 10 2.1 热能计量方法 10 2.2 总体设计框图 11 2.3 控制器的选型 11 2.4 温度传感器选择 12 2.5 流量传感器选择 13 2.6 IC卡选型 13 2.7 通讯方式选择 14 第3章 系统硬件设计 16 3.1 单片最小系统设计 16 3.2 温度检测模块设计 17 3.3 流量检测模块设计 19 3.4 数据存储模块设计 22 3.5 时钟电路设计 23 3.6 IC卡接口模块设计 24 3.7 天线电路 26 3.8 电动调节阀控制电路设计 27 3.9 显示模块设计 30 3.10 报警模块设计 31 3.11 键盘接口电路设计 31 3.12 通信模块设计 32 3.13 电源及电源监控电路设计 33 第4章 系统软件设计 36 4.1