小型无人机发动机温度监控系统设计

Design of Temperature Monitoring System for Small UAV Engine

摘要:

为了实时监控小型油动无人机的发动机工作温度，设计开发了基于K型热电偶的4路温度监控系统。该系统采用模拟开关CD4052作通道切换，选通的热电偶信号经放大调理，由STM32F103控制器片上A/D采集，经DS18B20数字温度传感器作冷端补偿，最终以Modbus RTU协议将温度值发送到485总线上。经调试校准，该温度监控系统在蚊子直升机MZ202型发动机正常工作温度范围内与原机温度仪表相差±3℃，数据刷新率大于2Hz，且工作稳定抗干扰能力较强，为发动机调校提供了可靠的依据，有效地保障了发动机安全稳定运行。该温度监控系统也可用于Rotax582，Rotax912/914等小型活塞航空发动机缸头及排气温度的采集与监控。

Abstract:

In order to monitor the engine working temperature of small oil-powered drones in real time, a 4-channel temperature monitoring system based on K-type thermocouples was designed and developed. The system uses the analog switch CD4052 for channel switching, the selected thermocouple signal is amplified and adjusted, collected by the STM32F103 controller chip A/D, and DS18B20 digital temperature sensor for cold junction compensation, and finally the temperature value is sent to the Modbus RTU protocol On the 485 bus. After debugging and calibration, the temperature monitoring system is within the normal operating temperature range of the mosquito helicopter MZ202 engine and the temperature gauge of the original machine is ±3℃, the data refresh rate is greater than 2Hz, and the work is stable and the anti-interference ability is strong, which provides for engine tuning. The reliable basis effectively guarantees the safe and stable operation of the engine. The temperature monitoring system can also be used to collect and monitor the cylinder head and exhaust temperature of small piston aero engines such as Rotax582, Rotax912/914.