METHOD AND APPARATUS TO DETERMINE A CYLINDER AIR CHARGE FOR AN INTERNAL COMBUSTION ENGINE
First Claim
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1. Method for estimating a cylinder air charge for an internal combustion engine, comprising:
- determining a first volumetric efficiency corresponding to engine operation with an open exhaust gas recirculation valve;
determining a second volumetric efficiency corresponding to engine operation with a closed exhaust gas recirculation valve; and
determining a cylinder air charge using a selected one of the first and second volumetric efficiencies.
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Abstract
A method for estimating a cylinder air charge for an internal combustion engine includes determining a first volumetric efficiency corresponding to engine operation with an open exhaust gas recirculation valve, determining a second volumetric efficiency corresponding to engine operation with a closed exhaust gas recirculation valve, determining a cylinder air charge using a selected one of the first and second volumetric efficiencies.
26 Citations
9 Claims
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1. Method for estimating a cylinder air charge for an internal combustion engine, comprising:
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determining a first volumetric efficiency corresponding to engine operation with an open exhaust gas recirculation valve; determining a second volumetric efficiency corresponding to engine operation with a closed exhaust gas recirculation valve; and determining a cylinder air charge using a selected one of the first and second volumetric efficiencies. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Method for estimating a cylinder air charge for an internal combustion engine, comprising:
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determining a proportion of an intake air charge that is recirculated exhaust gas; determining a first volumetric efficiency as a function of an engine speed and the proportion of the intake air charge that is recirculated exhaust gas; determining a second volumetric efficiency as a function of an intake air charge density and the engine speed; and determining a cylinder air charge using a selected one of the first and second volumetric efficiencies. - View Dependent Claims (8)
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9. Method for estimating a cylinder air charge for an internal combustion engine, comprising:
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determining an effective flow area of an exhaust gas recirculation valve as a function of a position of the exhaust gas recirculation valve and a ratio of an exhaust manifold pressure to an intake manifold pressure; determining an exhaust gas recirculation flowrate corresponding to the effective flow area of the exhaust gas recirculation valve; determining a proportion of the intake air charge as a ratio of the exhaust gas recirculation flowrate to the sum of the exhaust gas recirculation flowrate and an intake air flowrate; determining a first volumetric efficiency as a function of an engine speed and the proportion of the intake air charge that is recirculated exhaust gas; determining a second volumetric efficiency as a function of an intake air charge density and the engine speed; and determining a cylinder air charge using a selected one of the first and second volumetric efficiencies.
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Specification