Method for adjusting a boosted internal combustion engine with exhaust gas recirculation
AssigneeDaimlerChrysler AG
InventorWolfram Schmid
Life of this patent
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Abstract
A method for setting a supercharged internal combustion engine having exhaust-gas recirculation in which exhaust gas is fed from an exhaust tract of the engine arranged upstream of a turbine into an intake tract of the engine arranged downstream of a compressor. The fuel quantity injected into the combustion spaces of the internal combustion engine is set in dependence on the load. To adapt the exhaust-gas recirculation to any operating point of the engine, there is a provision for recirculating exhaust gases from only some of the cylinders, which assume the function of exhaust-gas dispenser cylinders, and for setting the injection of fuel into these dispenser cylinders independently of the remaining cylinders.
Claims7
A method for setting a supercharged internal combustion engine having exhaust-gas recirculation, the supercharged internal combustion engine comprising a plurality of cylinders and an exhaust-gas recirculation device capable of recirculating an exhaust gas from an exhaust tract of the engine arranged upstream of a turbine into an intake tract of the engine arranged downstream of a compressor comprising:
- injecting a quantity of fuel into a plurality of cylinders of the internal combustion engine in dependence on engine load;
- recirculating a portion of the exhaust gas from at least one cylinder which operates as an exhaust-gas dispenser cylinder into the intake tract;
- independently setting the quantity of fuel injected into the at least one exhaust-gas dispenser cylinder, wherein the quantity of fuel injected into the at least one exhaust-gas dispenser cylinder is determined in dependence on the engine load such that an exhaust-gas recirculation rate (EGR) follows a predetermined function, the exhaust-gas recirculation rate (EGR) being defined by:
- EGR=CO2, intake/CO2, exhaust gas
- wherein CO2, intake corresponds to a carbon dioxide fraction in the intake tract and CO2, exhaust gas corresponds to a carbon dioxide fraction in the exhaust tract.
Dependencies are inferred from the claim text.