Method and apparatus for controlling lean-burn engine to purge trap of stored NOx
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United States of America Patent
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Jan 18, 2005
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N/A
app pub date -
Mar 17, 2000
filing date -
Mar 17, 2000
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Abstract
A method and apparatus for controlling the operation of a 'lean-burn' internal combustion engine in cooperation with an exhaust gas purification system having an emissions control device capable of alternatively storing and releasing NO.sub.x when exposed to exhaust gases that are lean and rich of stoichiometry, respectively, determines a performance impact, such as a fuel-economy benefit, of operating the engine at a selected lean or rich operating condition. The method and apparatus then enable the selected operating condition as long as such enabled operation provides further performance benefits.
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