Method and apparatus for accessing ability of lean NOx trap to store exhaust gas constituent
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United States of America Patent
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Oct 30, 2001
Grant Date -
N/A
app pub date -
Mar 17, 2000
filing date -
Mar 17, 2000
priority date (Note) -
Expired
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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.
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