Intake oxygen estimator for internal combustion engine
AssigneeGM Global Technology Operations LLC
InventorAnupam Gangopadhyay
Life of this patent
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Abstract
An internal combustion engine system includes an intake manifold, a combustion chamber, an exhaust manifold and exhaust gas recirculation apparatus for recirculating a portion of the exhausted gases from the exhaust manifold to the intake manifold. An estimate intake manifold oxygen concentration is determined from the air fraction within the intake manifold which is determined from an engine system model that provides interdependent air mass fractions at various locations within the engine system.
Claims14
Control system for an internal combustion engine including a combustion chamber, an exhaust manifold, an intake manifold and exhaust gas recirculation apparatus for variable recirculation of exhaust gases from the exhaust manifold to the intake manifold, comprising:
- means for providing respective measures of a plurality of engine operating parameters;
- a microprocessor based controller including computer code stored in a storage medium for applying the engine operating parameter measures to a model to estimate interdependent air mass fractions at locations within the internal combustion engine;
- and
- at least one actuator controlled in response to at least one of said interdependent air mass fractions.
Method for estimating oxygen concentration at points within an internal combustion engine system including a combustion chamber, an exhaust manifold, an intake manifold and exhaust gas recirculation apparatus for variable recirculation of exhaust gases from the exhaust manifold to the intake manifold, comprising
- reticulating the engine system into a plurality of interconnected engine sub-systems;
- modeling the interconnected engine sub-systems to provide interdependent air mass fractions at predetermined points within the internal combustion engine;
- and
- estimating oxygen concentration at said predetermined points within the internal combustion engine as a function of the respective modeled air mass fractions at said predetermined points.
Method for estimating oxygen concentration in an intake manifold of an internal combustion engine system including an exhaust manifold and exhaust gas recirculation apparatus for variable recirculation of exhaust gases from the exhaust manifold to the intake manifold, comprising
- reticulating the engine system into a plurality of interconnected engine sub-systems including an intake manifold, an exhaust manifold, an exhaust gas recirculation apparatus and combustion chambers;
- identifying all significant mass flows corresponding to said engine sub-systems including combustion chamber exhaust mass flow;
- identifying all significant pressure nodes corresponding to said engine sub-systems including the intake manifold and exhaust manifold;
- modeling interdependent air mass fractions at a) the identified pressure nodes including the air mass fraction at the intake manifold, and b) the combustion chamber exhaust mass flow;
- and
- estimating oxygen concentration in the intake manifold as a function of the modeled air mass fraction at the intake manifold.
Dependencies are inferred from the claim text.