公开(公告)号：US20170003259A1

公开(公告)日：2017-01-05

申请号：US15200726

申请日：2016-07-01

申请人： DAF Trucks N.V.

发明人： Arjen Daniël HUNTER

IPC分类号： G01N33/00 ,  G01M15/10 ,  F01N11/00

CPC分类号： G01N33/0006 ,  F01N11/00 ,  F01N2560/026 ,  F01N2560/14 ,  F01N2900/0416 ,  F01N2900/08 ,  F02D41/0037 ,  F02D41/1441 ,  F02D41/1461 ,  F02D41/1463 ,  F02D41/222 ,  F02D41/266 ,  G01M15/102 ,  G01N33/0037 ,  Y02A50/245 ,  Y02T10/47

摘要： A method and apparatus for field testing and diagnosing at least one NOx-sensor in a diesel engine exhaust system are disclosed. The field testing apparatus is connectable to a truck having a lean burn diesel type engine, via an on-board diagnostic connector. The field testing apparatus is arranged to initiate a test cycle, and to diagnose at least one NOx-sensor in an exhaust system of the truck. The test cycle is performed on a running engine as a test sequence in a stationary truck, in at least two different states of operation, while NOx related values issued by the at least one NOx-sensor are measured over a predefined period of time. At least one state of operation is obtained by simultaneously opening the exhaust gas recirculation valve and controlling the back pressure valve for increasing backpressure. A dedicated algorithm is used to compare the measured values to a predefined model, and to provide a numerical summary and statistical evaluation of the sensor functioning. The numerical summary being indicative of a likelihood of the at least one NOx-sensor behaving correctly, and thereby enables a well founded decision as to whether or not the at least one NOx-sensor requires replacement.

摘要翻译： 公开了用于现场测试和诊断柴油发动机排气系统中的至少一个NOx传感器的方法和装置。 现场测试装置可通过车载诊断连接器连接到具有稀燃柴油型发动机的卡车。 现场测试装置被布置成启动测试循环，并且诊断卡车的排气系统中的至少一个NOx传感器。 测试循环在运行的发动机中作为固定式卡车中的测试顺序在至少两种不同的操作状态下进行，而由至少一个NOx传感器发出的NOx相关值在预定的时间段内被测量。 通过同时打开废气再循环阀并控制用于增加背压的背压阀来获得至少一个操作状态。 使用专用算法将测量值与预定义模型进行比较，并提供传感器功能的数值总结和统计评估。 该数字摘要指示至少一个NOx传感器行为正确的可能性，从而能够确定至少一个NOx传感器是否需要更换。