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計量論壇

標題: 基于協(xié)議傳輸?shù)能囕dOBD采集終端數(shù)字計量方法 [打印本頁]

作者: shipucun 時間: 5 天前
標題: 基于協(xié)議傳輸?shù)能囕dOBD采集終端數(shù)字計量方法
為保障車載OBD采集終端的量值準確可靠，提高重型柴油車尾氣排放監(jiān)測和超標篩查治理的效果，提出了一種數(shù)字計量方法。介紹了車載OBD采集終端的定義、應(yīng)用情況和計量現(xiàn)狀，闡述了車載OBD采集終端的校準方法，分別從最大允許誤差的確定和不確定度評定兩方面論證了車載OBD采集終端的計量特性。通過論證得到三個結(jié)論：校準裝置發(fā)動機實時數(shù)據(jù)流最大允許誤差取協(xié)議規(guī)定的數(shù)據(jù)流精度，車載OBD采集終端的最大允差取校準裝置允差的二倍；校準裝置發(fā)動機實時數(shù)據(jù)流引入的不確定度Urel=1×10-6,■，經(jīng)車載OBD采集終端不確定度評定測算，滿足U≤MPEV/3的量傳要求；試驗結(jié)果表明，車載OBD采集終端示值誤差不超過最大允許誤差，計量性能要求合理，校準方法可操作性強。

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