Apparatus and method for calculating internal exhaust gas recirculation (EGR) amount of engine including continuously variable valve duration apparatus
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorsMin-Kyu Won, Hyung-Soo Do, Soo-Hyeok Kang, Dae-Woo Kim
Life of this patent
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Abstract
A method and apparatus for calculating an internal exhaust gas recirculation (EGR) amount of an engine include a continuously variable valve duration (CVVD) apparatus. The internal EGR amount is calculated by correcting a backflow gas amount based on a valve duration changed by operation of the continuously variable valve duration apparatus during valve overlap of an intake valve or an exhaust valve.
Claims17
A method for calculating an internal exhaust gas recirculation (EGR) amount of an engine including a continuously variable valve duration apparatus (CVVD), comprising:
- calculating an internal EGR amount, by an internal EGR amount calculator, based on valve duration changed by operation of the continuously variable valve duration apparatus during valve overlap of an intake valve or an exhaust valve,
- wherein the internal EGR amount is a sum of a residual gas amount in a cylinder of the engine and a backflow gas amount of gas flowing back into the cylinder during valve overlap, and
- wherein the backflow gas amount is a value obtained by correcting a basic backflow gas amount determined based on an exhaust pressure, an intake pressure, an exhaust gas temperature, and valve overlap duration in a valve overlap period based on the valve duration changed by the operation of the continuously variable valve duration apparatus.
An apparatus for calculating an internal EGR amount of an engine including a continuously variable valve duration apparatus, the apparatus comprising:
- a cylinder residual gas amount calculator configured to calculate a residual gas amount in a cylinder of the engine including the continuously variable valve duration apparatus based on an internal volume and an internal pressure of the cylinder of the engine, and an exhaust gas temperature;
- a basic backflow gas amount calculator configured to calculate an amount of gas flowing back into the cylinder through an exhaust valve during valve overlap based on exhaust pressure, an intake pressure, an exhaust gas temperature, and valve overlap duration in a valve overlap period;
- and
- an internal EGR amount calculator configured to calculate the internal EGR amount using the cylinder residual gas amount calculated by cylinder residual gas amount calculator and the basic backflow gas amount calculated by the basic backflow gas amount calculator,
- wherein the internal EGR amount calculator calculates the internal EGR amount by correcting the basic backflow gas amount based on valve duration changed by an operation of the continuously variable valve duration apparatus during the valve overlap of an intake valve or the exhaust valve.
Dependencies are inferred from the claim text.