Engine including low pressure egr system and internal egr

An engine assembly comprising:

• an engine structure defining a combustion chamber and intake and exhaust ports in communication with the combustion chamber;
• an intake system in communication with the intake port;
• an exhaust system including an exhaust conduit in communication with exhaust port and a diesel particulate filter located in the exhaust conduit;
• a valvetrain assembly including an intake valve located in the intake port, an intake valve lift mechanism engaged with the intake valve, an intake cam lobe engaged with the intake valve lift mechanism and defining an intake lift region adapted to open the intake valve, an exhaust valve located in the exhaust port, an exhaust valve lift mechanism engaged with the exhaust valve and operable in first and second modes, and a first exhaust cam lobe engaged with the exhaust valve lift mechanism and defining an EGR lift region at least partially rotationally aligned with the intake lift region and adapted to open the exhaust valve during the first mode, the exhaust valve being maintained in a closed position when the EGR lift region engages the exhaust valve lift mechanism during the second mode;
• and
• a backpressure control valve located downstream of the diesel particulate filter and adapted to control a pressure differential between the intake and exhaust systems and control recirculation of exhaust gas from the exhaust system to the intake system.