Method for reintroducing exhaust gas to the intake of an internal-combustion engine and engine using same

A method for reintroducing exhaust gas and fresh air to the intake of an internal-combustion engine wherein, during the engine exhaust phase, part of the exhaust gas contained in the combustion chamber of a cylinder of the engine is fed, for an operating range of this engine, into a first fluid circulation circuit (C1) and the other part of said gas is discharged into an exhaust circuit, characterized in that the method comprises:

• during the engine exhaust phase, opening an intake/exhaust valve and feeding the exhaust gas into the first fluid circulation circuit (C1) through an intake/exhaust connected to the first fluid circulation circuit (C1), and opening an exhaust valve and feeding the exhaust gas into an exhaust pipe of an exhaust manifold of the engine through an exhaust connected to the exhaust pipe of the exhaust manifold of the engine;
• during the intake phase, closing the intake/exhaust valve, closing the exhaust valve, opening an intake valve after closing the intake/exhaust valve and cooling the exhaust gas fed into the first fluid circulation circuit (C1),
• mixing the cooled recirculated exhaust gas with fresh supply air (AF) coming from the engine supply circuit and flowing into the first fluid circulation circuit (C1),
• feeding the mixture of recirculated cooled exhaust gas and supply air into a second fluid circulation circuit (C2),
• cooling said mixture fed into the second fluid circulation circuit (C2) prior to feeding it into the combustion chamber, and
• supplying the mixture of the cooled exhaust gas and the fresh air into the combustion chamber through the second fluid circulation circuit (C2) via the intake valve.