公开(公告)号：US20100257844A1

公开(公告)日：2010-10-14

申请号：US12758999

申请日：2010-04-13

申请人： Osamu SHIMOMURA ,  Masakazu Sakata ,  Masatoshi Maruyama ,  Kazuharu Tochikawa

发明人： Osamu SHIMOMURA ,  Masakazu Sakata ,  Masatoshi Maruyama ,  Kazuharu Tochikawa

IPC分类号： F01N11/00 ,  F01N9/00 ,  F01N3/10

CPC分类号： F01N3/208 ,  F01N11/00 ,  F01N2560/026 ,  F01N2570/10 ,  F01N2610/02 ,  F01N2900/1622 ,  Y02T10/24 ,  Y02T10/47

摘要： An exhaust gas purifying system for a diesel engine has an ECU, a passage of exhaust gas, a unit having SCR catalyst, a NOx sensor placed at a downstream side of the unit, and a urea water adding valve placed at an upstream side of the unit. The SCR catalyst in the unit selectively adsorbs ammonia, and selectively purifies NOx contained in an exhaust gas emitted from the diesel engine by the adsorbed ammonia. The ECU changes the urea water adding amount, and performs abnormality diagnosis based on the detection result of the NOx sensor while changing an adding amount of the urea water. The ECU uses a first condition to indicate the presence of an excess NOx amount in the exhaust gas, and a second condition to indicate there is no error cause by the ammonia adsorption on the SCR catalyst.

摘要翻译： 用于柴油发动机的排气净化系统具有ECU，废气通道，具有SCR催化剂的单元，位于该单元下游侧的NOx传感器，以及放置在该单元的上游侧的尿素水添加阀 单元。 该单元中的SCR催化剂选择性地吸附氨，并且通过吸附的氨选择性地净化从柴油发动机排放的废气中所含的NOx。 ECU改变尿素水添加量，并且在改变尿素水的添加量的同时，基于NOx传感器的检测结果进行异常诊断。 ECU使用第一条件来指示废气中存在过量的NOx量，并且指示不存在SCR催化剂上的氨吸附引起的误差的第二条件。

公开(公告)号：US20090293459A1

公开(公告)日：2009-12-03

申请号：US12476563

申请日：2009-06-02

申请人： Osamu SHIMOMURA ,  Masakazu Sakata ,  Masatoshi Maruyama

发明人： Osamu SHIMOMURA ,  Masakazu Sakata ,  Masatoshi Maruyama

IPC分类号： F01N9/00 ,  F01N3/10 ,  F01N3/035

CPC分类号： F01N3/208 ,  F01N2560/026 ,  F01N2560/06 ,  F01N2610/02 ,  Y02T10/24

摘要： An SCR catalyst is provided in an exhaust pipe of an engine and a urea solution addition valve is provided upstream of the SCR catalyst in the exhaust pipe. An ECU calculates ammonia adsorption quantity of the SCR catalyst and controls urea solution addition quantity, which is added by the urea solution addition valve, based on the ammonia adsorption quantity. The ECU obtains temperature of the SCR catalyst or temperature information correlated with the temperature through measurement or estimation. The ECU switches an execution mode of the urea solution addition control based on the catalyst temperature or the temperature information. Thus, reducing agent addition control can be performed suitably and eventually NOx purification in a NOx catalyst (i.e., SCR catalyst) can be performed suitably.

摘要翻译： 在发动机的排气管中设置SCR催化剂，在排气管中的SCR催化剂的上游设置有尿素溶液添加阀。 ECU计算SCR催化剂的氨吸附量，并根据氨吸附量控制尿素溶液添加阀添加的尿素溶液添加量。 ECU通过测量或估计获得SCR催化剂的温度或与温度相关的温度信息。 ECU根据催化剂温度或温度信息切换尿素溶液添加控制的执行模式。 因此，可以适当地进行还原剂添加控制，并且可以适当地进行NOx催化剂（即SCR催化剂）的NOx净化。