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US 2013/0092124 A1Published application
Method for reducing the particle emissions of a spark-ignition internal combustion engine with direct injection, and internal combustion engine for carrying out such a method
AssigneeFord Global Technologies, LLC
InventorsThomas Lorenz, Moritz Klaus Springer, Helmut Hans Ruhland, Jan Mehring
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Abstract
A method for reducing the particle emissions of a spark-ignition, direct-injection internal combustion engine is provided. The method comprises operating at least one cylinder superstoichiometrically, responsive to an injector coking level and sufficiently high cylinder temperature, for a duration to increase oxidation of coking residues.
Claims20
A method of operating a direct-injected, spark-ignited engine, comprising:
- direct-injecting gasoline to an engine cylinder;
- spark-igniting the injected gasoline;
- responsive to an injector coking level and sufficiently high cylinder temperature, operating the at least one cylinder superstoichiometrically for a duration to increase oxidation of coking residues.
A method of operating a direct-injected, spark-ignited engine, comprising:
- direct-injecting gasoline to an engine cylinder;
- spark-igniting the injected gasoline;
- responsive to soot emission levels and sufficiently high cylinder temperature, operating the cylinder superstoichiometrically for a duration to promote oxidation of coking residues.
A method of operating a direct-injected, spark-ignited engine, comprising:
- direct-injecting gasoline to an engine cylinder;
- spark-igniting the injected gasoline;
- during a first cylinder temperature range, operating the cylinder at a first superstoichiometric air-fuel ratio for a first duration to promote oxidation of coking residues;
- and during a second cylinder temperature range higher than the first range, operating the cylinder at a second substoichiometric air-fuel ratio to reduce exhaust component overtemperature conditions.
1 more element
Dependencies are inferred from the claim text.