潍柴蓝擎国IV发动机SCR后处理故障排除指南潍柴动力技术中心王秀雷李万洋孟媛媛桑心成2011年12月1目录SCR后处理故障排除指南.........................................................................................................................................................................................1目录2第一章概述..........................................................................................................................................................................................................41.1SCR后处理概述..................................................................................................................................................................................................................................................41.2SCR后处理原理..................................................................................................................................................................................................................................................51.3SCR后处理组成..................................................................................................................................................................................................................................................5第二章故障诊断与案例分析..............................................................................................................................................................................121.1故障分类....................................................................................................................................................................................................................................13第一类故障：尿素压力建立失败..........................................................................................................................................................................................................................14第二类故障：尿素消耗少......................................................................................................................................................................................................................................18第三类故障：OBD扭矩限制与不可清除代码.....................................................................................................................................................................................................20第四类故障：OBD灯.............................................................................................................................................................................................................................................26第五类故障：尿素加热不放行..............................................................................................................................................................................................................................27第六类故障：NOx转化效率低..............................................................................................................................................................................................................................29第七类故障：NOx转化效率监测不放行......................................................................
