Exhaust gas control system for internal combustion engine
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United States of America Patent
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Jan 9, 2018
Grant Date -
Sep 8, 2016
app pub date -
Mar 2, 2016
filing date -
Mar 4, 2015
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Abstract
In an exhaust gas control system for an internal combustion engine operable at a lean air-fuel ratio, after a request to stop the internal combustion engine has been issued, the internal combustion engine is operated at a stoichiometric air-fuel ratio or lower until an air-fuel ratio in an SCR catalyst becomes lower than or equal to the stoichiometric air-fuel ratio, and then supply of fuel to the internal combustion engine is stopped.
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