Internal combustion engine intake port flow determination
First Claim
1. A method of determining intake port mass airflow in an internal combustion engine including intake and exhaust systems, said intake system having an intake air throttle, an intake manifold, an intake port including an intake valve for directing gas flow from the intake manifold into a combustion chamber, said exhaust system having an exhaust port including an exhaust valve and an exhaust manifold, the method comprising the steps:
- determining pressures in said intake and exhaust manifolds;
measuring engine speed; and
,determining gas mass flow through the intake port as a predetermined function of engine speed and a ratiometric relationship of intake and exhaust manifold pressures.
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Accused Products
Abstract
An internal combustion engine system includes a plurality of pneumatic elements including pneumatic resistances, pneumatic capacitances, and pneumatic sources. A pneumatic state model determines a pressure rate of change and pressure for certain areas of the internal combustion engine system designated as pneumatic volume nodes. Intake port flow is determined from pressures at the intake and exhaust manifolds, engine RPM and density correction factors. Intake port flow in a variable valve timing engine system further includes a phase deviation of the valve timing in the determination thereof.
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Citations
15 Claims
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1. A method of determining intake port mass airflow in an internal combustion engine including intake and exhaust systems, said intake system having an intake air throttle, an intake manifold, an intake port including an intake valve for directing gas flow from the intake manifold into a combustion chamber, said exhaust system having an exhaust port including an exhaust valve and an exhaust manifold, the method comprising the steps:
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determining pressures in said intake and exhaust manifolds; measuring engine speed; and
,determining gas mass flow through the intake port as a predetermined function of engine speed and a ratiometric relationship of intake and exhaust manifold pressures. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of determining intake port mass airflow in an internal combustion engine including a combustion cylinder and piston reciprocating therein, an intake manifold and exhaust manifold, said intake manifold characterized by a first plurality of pneumatic elements having gas flow ports and coupled to the intake manifold, said first plurality of pneumatic elements including the combustion cylinder coupled to the intake manifold via an intake port, the combustion cylinder further including an intake valve for controlling gas flow from the intake manifold into said combustion cylinder, said exhaust manifold characterized by a second plurality of pneumatic elements having gas flow ports coupled to the exhaust manifold, said second plurality of pneumatic elements including the combustion cylinder coupled to the exhaust manifold via an exhaust port, the combustion cylinder further including an exhaust valve for controlling gas flow from the combustion cylinder into the exhaust manifold, the method comprising the steps:
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designating the intake and exhaust manifolds as respective pneumatic volume nodes; for each of the intake and exhaust manifold pneumatic volume nodes; providing respective sets of pneumatic parameters associated with selected ones of the respective first and second pluralities of pneumatic elements that are coupled to the respective ones of said intake and exhaust manifold pneumatic volume nodes, said selected ones of the respective first and second pluralities of pneumatic elements including said combustion cylinder, and determining respective gas mass flows through each of said selected ones of said first and second plurality of pneumatic elements, including said combustion cylinder, as respective predetermined functions of each respective set of pneumatic parameters, whereby the intake port mass airflow is the respective gas mass flow through said combustion cylinder. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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Specification