Process for controlling the intake of a direct-injection four-stroke engine
AssigneeInstitute Francais du Petrole
InventorGaetan Monnier
Life of this patent
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Abstract
The present invention is a process for controlling the intake of a direct fuel injection four-stroke engine in at least two combustion chambers. A diferent intake for at least two cylinders or groups of cylinders is used in order to reduce exhaust emissions. A first cylinder or group of cylinders is operated with an air/fuel ratio greater than or equal to one, and a second cylinder or group of cylinders (21, 24) is operated in under-stoichiometric conditions.
Claims24
A process for controlling a direct fuel injection four-stroke multiple cylinder engine having an air and fuel intake, an exhaust system and an exhaust gas recirculation system which recirculates a part of exhaust gas from the exhaust system to the air and fuel intake comprising:
- operating at least one cylinder from air and fuel supplied by the air and fuel intake with a rich fuel/air ratio with a fuel/air ratio of one representing a stoichiometric mixture, a fuel/air ratio greater than one representing a rich fuel mixture, and a fuel/air ratio of less than one representing a lean mixture with exhaust gas from the at least one cylinder being circulated through a redox catalyst within the exhaust system;
- operating at least one other cylinder from air and fuel supplied by the air and fuel intake with a lean mixture;
- and
- recycling with the exhaust gas recirculation system at least part of exhaust gases from the exhaust system to the air and fuel intake.
Dependencies are inferred from the claim text.