基于单片机的热气机监控系统设计与实现

Measurement and control system of Stirling Engine based on Embedded Microcontrolle

摘要:

为了实现对热气机加热端管壁温度和燃烧室压力的监控，以PIC18F6722单片机作为控制逻辑算法核心设计了热气机监控系统，文中介绍了监控系统的整体设计、控制策略、硬件和软件设计等设计方法，还采用PC机作为上位机，使用组态王软件设计了人机对话窗口。监控系统在热气机发电机组实际使用中，采用PID控制完成了热气机加热端温度控制，其控制精度为±5℃；通过穿越逻辑控制与二进制相结合的方法成功实现热气机燃烧室压力控制，将其压力控制稳定在2.8±0.025 MPa内，同时还将排气阀使用时间提高了6倍。本监控系统也可为热气机性能仿真、优化设和热气机性能优劣判定提供计了相关数据。

Abstract:

In order to realize the monitoring of the heating end tube wall temperature and the combustion chamber pressure of the Stirling Engine, the monitoring system is designed with PIC18F6722 Embedded Microcontroller as the core of the control logic algorithm. The overall design, control strategy, hardwares and softwares design methods of the monitoring system are introduced. The PC is used as the host computer, and the man-machine dialogue window is designed with Kingview software. In the actual use of the Stirling Engine generator set, the monitoring system uses PID control to complete the temperature control of the heating end of the Stirling Engine, and the control precision is ± 5 ℃. Through the combination of crossing logic control and binary system, the pressure control of the hot gas engine combustion chamber is successfully realized, and the pressure control is stable within 2.8 ± 0.025 MPa. At the same time, the service time of the exhaust valve is increased by 6 times. The monitoring system also provides relevant data for performance simulation, optimization design and judgment of the Stirling Engine