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针对目前对CAN总线网络测试手段仅仅采用专用总线接口芯片采用监听方式获知总线完好的数据帧,车载总线因畸变、干扰等造成的错误、异常数据帧都被专用总线协议芯片过滤掉,没办法对总线物理层的传输波形进行测试,总线上出现故障节点无法定位故障节点等问题,这里提出了车载CAN总线在环测试技术,设计了在环测试实验方案,并利用测试节点仿真设备验证了该技术在故障定位方面的可行性。
For the current CAN bus network test means only using a dedicated bus interface chip to monitor the use of monitoring bus to know the integrity of the data frame, vehicle bus due to distortion, interference and other errors caused by abnormal data frames are bus protocol chip filter out, no way Bus physical layer of the transmission waveform test, the bus failed node can not locate the fault node and so on, presented here in-vehicle CAN bus in-loop test technology, designed in the loop test program, and the use of test node simulation equipment to verify the technology Feasibility of fault location.