公开(公告)号：US06309536B1

公开(公告)日：2001-10-30

申请号：US09172017

申请日：1998-10-14

申请人： Hirosi Inagaki ,  Noriaki Kondo ,  Shigeru Miyata

发明人： Hirosi Inagaki ,  Noriaki Kondo ,  Shigeru Miyata

IPC分类号： G01N27407

CPC分类号： F01N3/0842 ,  B01D53/9495 ,  F01N11/00 ,  F01N2550/02 ,  F01N2550/03 ,  F01N2570/04 ,  F02D41/028 ,  F02D41/146 ,  F02D41/1463 ,  G01N27/417 ,  Y02T10/47

摘要： A method and apparatus for detecting a functional condition of an NOx occlusion catalyst using an NOx sensor. In order to compensate for variations in oxygen concentration of the exhaust gas which would otherwise affect the detected NOx concentration downstream of the NOx occlusion catalyst, a relative value is calculated as the difference between the detected NOx concentration and the value of the detected NOx concentration initially after start of operation control of an internal combustion engine at a lean air-fuel ratio. The occlusion capability of the NOx occlusion catalyst is judged to have deteriorated when an increase in the relative value exceeds a predetermined value. On the other hand, the NOx occlusion catalyst is judged to have suffered an anomaly when the rate of increase in the relative value becomes greater than a predetermined allowable value.

摘要翻译： 一种使用NOx传感器检测NOx吸留催化剂的功能状态的方法和装置。 为了补偿否则将影响NOx吸留催化剂下游检测到的NOx浓度的排气的氧浓度的变化，计算相对值，作为检测到的NOx浓度与检测到的NOx浓度的初始值之间的差 在内燃机以稀空燃比开始运转控制之后。 当相对值的增加超过预定值时，判断NOx吸留催化剂的闭塞能力已劣化。 另一方面，当相对值的增加率大于预定的允许值时，判断为NOx吸留催化剂发生异常。