Patent Number: 6,308,515

Title: Method and apparatus for accessing ability of lean NOx trap to store exhaust gas constituent

Abstract: A method and apparatus for controlling the operation of a "lean-burn" internal combustion engine in cooperation with an emissions control device capable of alternatively storing and releasing an exhaust gas constituent when exposed to exhaust gases that are lean and rich of stoichiometry, respectively, determines an ability of the device to store the exhaust gas constituent by initiating a lean engine operating condition immediately following a first purge event; discontinuing the first lean engine operating condition in favor of a second purge event when the instantaneous efficiency of the device falls below a reference value; and determining the amount of excess fuel necessary to release the thus-stored amount of exhaust gas constituent.

Inventors: Bidner; David Karl (Livonia, MI), Surnilla; Gopichandra (West Bloomfield, MI)

Assignee: Ford Global Technologies, Inc.

International Classification: F01N 11/00 (20060101); F02D 41/14 (20060101); F02D 41/02 (20060101); F01N 3/08 (20060101); F01N 7/00 (20060101); F01N 7/02 (20060101); F01N 003/00 ()

Expiration Date: 10/30/2018