Patent Number: 6,305,160

Title: Emission control system

Abstract: A reductant injection control strategy for controlling an amount of nitrogen oxide reducing agent injected upstream of a selective reduction catalyst uses a NOx sensor located downstream of the catalyst. An open loop injection quantity is first determined based on operation conditions. Nitrogen oxide conversion efficiency of the catalyst is controlled by controlling the reductant injection based on after catalyst NOx sensor reading and engine out nitrogen oxide concentration.

Inventors: Hammerle; Robert Henry (Franklin, MI), Adams; Karen Marie (Dearborn Heights, MI), Laing; Paul Matthew (Canton, MI)

Assignee: Ford Global Technologies, Inc.

International Classification: F01N 3/20 (20060101); F01N 9/00 (20060101); F01N 003/00 ()

Expiration Date: 10/23/2018