基于CAN总线的车轮电子检测器的设计

车轮电子检测器是铁路电务部门车辆记轴系统的基本单元。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,带有冗余CAN总线接口。根据总体技术指标要求,本设计采用了TI公司的DSP芯片TMS320F2812。利用其片内AD及外加16路多路开关,可实现多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。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。

Wheel electronic detector is the basic unit in calculation of axle of Railway Telecommunication 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 re- dundant CAN intecface to achieve bus error processing and passive bus switching functions. According to the requirements of the general technical indicators,the Texas Instruments DSP chip TMS320F2812 is chosen. It has 12 bit on-chip ADC and a 16-channel analog switch. 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 design. The actual ＇test results show that the collection node works stably. It can meet the performance requirements of the control system.