Title:
【発明の名称】吸蔵トラップの加熱
Document Type and Number:
Japanese Patent JP2002501585
Kind Code:
A
Abstract:
A lean NOx trap in an exhaust system of a spark ignition internal combustion engine having a three-way catalyst upstream of the lean NOx trap, and the lean NOx trap connected in series along the exhaust system is heated by modulating the air to fuel ratio (AFR) of the engine cyclically at various frequencies such as 0.5 Hz, 1 Hz, 1.5 Hz, and 2 Hz, so that different portions of the lean NOx trap are heated at different times so as to completely remove sulfur from the lean NOx trap.
Inventors:
Thomas, Zoi Hey, Ma
Application Number:
JP54357398A
Publication Date:
January 15, 2002
Filing Date:
December 31, 1997
Export Citation:
Assignee:
FORD GLOBAL TECHNOLOGIES, INC.
International Classes:
F01N3/24; B01D53/94; F01N3/20; F01N3/28; F02D41/02; F02D41/04; F01N3/08; F01N13/02; F02D41/14; (IPC1-7): F02D41/04; F01N3/24; F01N3/28
Attorney, Agent or Firm:
Hiroshi Maeda (7 outside)