不能尿素有催化的功能,它可以把氮氧化物还原成氮气和水,从而降低尾气污染程度。尿素消耗的正常标准为柴油量的5%~8%,而国六车尿素消耗高的终其原因就是它是国六排放。国六与国五相比,对氮氧化物的排放限值严格了28%,由此当发动机工作时,便需要多喷一点尿素来降低氮氧化物的排放量,尤其是在怠速和低负荷工况下。不同于国五的开环控制,国六车的发动机和后处理是闭环控制的,一旦屏蔽了尿素系统,后处理上的传感器会检测到排放不达标,进而对发动机进行限扭限速;排放超标的话,系统还会将数据自动上传至监管平台,会对后续审车、验车等方面造成极大的影响。
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