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(zhǔn)確可靠，提高重型柴油車尾氣排放監(jiān)測和超標(biāo)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(zhǔn)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(zhǔn)裝置發(fā)動機(jī)實(shí)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(zhǔn)裝置允差的二倍；校準(zhǔn)裝置發(fā)動機(jī)實(shí)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(yàn)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(zhǔn)方法可操作性強(qiáng)。

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