基于双余度CAN总线的起落架数据采集节点

Data Acquisition Node in Landing Gear Based on Dual-Redundancy CAN

采集节点是起落架分布式数据采集系统的基本单元。它要求具有大量数据采集和处理能力,灵活的采样周期,以满足系统实时性要求;带有双余度CAN总线接口,能够实现总线错误处理及被动切换功能。根据总体技术指标要求,本设计采用了德州仪器公司的DSP芯片TMS320F2808。利用其片内AD及外加16路多路开关,可实现31路模拟信号的采集和处理。另外,该芯片还带2个片内CAN控制器,通过软件可进行节点的总线错误处理及响应主节点的总线检测与切换命令。实际测试结果表明,该采集节点工作稳定,满足系统的性能要求。

Acquisition node, as the basic unit of the distributed data acquisition system, is an important component of landing gear integrated control system. It requires the acquisition and processing capability for a large number of data, a flexible sampling period to meet the real-time requirements of the system, and a ＇dual redun- dant CAN interface to achieve bus error processing and passive bus switching functions. According to the requirements of the general technical indicators, the Texas Instruments DSP chip TMS320F2808 is chosen. With its 12 bit on-chip ADC and a 16-channel analog switch, the acquisition node can collect and process 31-channels analog signals. In addition, the DSP also have two enhanced CAN controllers, which can support the bus error processing in node, and respond the bus detection and switching orders from main node by software de- sign. The actual test results show that the collection node works stably. It can meet the performance requirements of the control system.