公开(公告)号：US08991154B2

公开(公告)日：2015-03-31

申请号：US12834126

申请日：2010-07-12

Applicant: Chun Tai ,  Timothy Booher ,  Heath Morris

Inventor： Chun Tai ,  Timothy Booher ,  Heath Morris

IPC: F01N3/00 ,  F01N3/20

CPC classification number: F01N3/208 ,  F01N2900/1621 ,  Y02A50/2325 ,  Y02T10/24

Abstract: Methods and systems for controlling reductant levels in an SCR catalyst are provided. In one aspect, reductant levels are adjusted in response to a ratio of change of NOx conversion efficiency to a change of reductant level. In another aspect, reductant injection levels are periodically adjusted to see if NOx conversion efficiency is better or worse at the adjusted levels.

Abstract translation: 提供了用于控制SCR催化剂中还原剂水平的方法和系统。 在一个方面，还原剂水平是根据NOx转化效率的变化与还原剂水平的变化的比率而调节的。 另一方面，周期性地调节还原剂注入水平，以观察NOx转化效率在调节水平下是好还是差。

公开(公告)号：US20120006004A1

公开(公告)日：2012-01-12

申请号：US12834126

申请日：2010-07-12

Applicant: Chun Tai ,  Timothy Booher ,  Heath Morris

Inventor： Chun Tai ,  Timothy Booher ,  Heath Morris

IPC: F01N3/00 ,  F01N9/00 ,  F01N3/10

CPC classification number: F01N3/208 ,  F01N2900/1621 ,  Y02A50/2325 ,  Y02T10/24

Abstract: Methods and systems for controlling reductant levels in an SCR catalyst are provided. In one aspect, reductant levels are adjusted in response to a ratio of change of NOx conversion efficiency to a change of reductant level. In another aspect, reductant injection levels are periodically adjusted to see if NOx conversion efficiency is better or worse at the adjusted levels.

Abstract translation: 提供了用于控制SCR催化剂中还原剂水平的方法和系统。 在一个方面，还原剂水平是根据NOx转化效率的变化与还原剂水平的变化的比率而调节的。 另一方面，周期性地调节还原剂注入水平，以观察NOx转化效率在调节水平下是好还是差。