To suppress data garbled due to the influence of noise mixed from the outside and sampling error due to blunting the waveform of a signal.SOLUTION: A vehicle fault diagnostic device 40 includes an AC termination circuit 52, a split termination circuit 62, a switch 50 that connects an AC termination circuit 52 or a split termination circuit 62 to an external communication line (first external communication line 44 and second external communication line 46) connected to a differential 2-wire type in-vehicle communication line including a first in-vehicle communication line 14, a third in-vehicle communication line 18, a second in-vehicle communication line 16, and a fourth in-vehicle communication line 20, and mounted on a vehicle 10, and a control unit 70 that selects whether to connect the AC termination circuit 52 or the split termination circuit 62 to the external communication line on the basis of at least the communication speed in the communication via the in-vehicle communication line and the external communication line.SELECTED DRAWING: Figure 1

    【課題】外部から混入するノイズの影響によるデータ化けや、信号の波形を鈍らせてしまうことによるサンプリングエラーを抑制することを可能とする。【解決手段】車両用故障診断装置40は、AC終端回路52と、スプリット終端回路62と、車両10に搭載され第1車載通信線14、第3車載通信線18、第2車載通信線16および第4車載通信線20を含む差動2線式の車載通信線と接続される外部通信線(第1外部通信線44および第2外部通信線46)にAC終端回路52またはスプリット終端回路62を接続するスイッチ50と、少なくとも車載通信線および外部通信線を経由する通信における通信速度に基づいて、外部通信線にAC終端回路52を接続させるかスプリット終端回路62を接続させるかを選択する制御部70と、を含んでいる。【選択図】図1


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    Title :

    VEHICLE FAULT DIAGNOSTIC DEVICE


    Additional title:

    車両用故障診断装置


    Contributors:

    Publication date :

    2021-03-25


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    H04L TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION , Übertragung digitaler Information, z.B. Telegrafieverkehr / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR



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