System for exhaust/crankcase gas recirculation

摘要

An exhaust gas recirculation system for an internal combustion engine by which a portion of exhaust gas from the engine is recirculated from an exhaust line of the engine into an intake line of the engine, introducing the exhaust gas flow into the intake port around the intake valve seat region. The present invention provides a unique means of introducing EGR/Crankcase gas into the combustion chamber of an engine. The location for introducing EGR/Crankacse gas is above the intake valve seat region. The system does not require any pumping arrangement either through the use of external pumps or by raising the exhaust back presssure in the system. This system does not penalize airflow into the system as the flow passage does not require reduction in size to the air passage. Introducing the EGR just during the air induction process means the quantity of exhaust gas in the system is minimal. This results in improved transient response. Use of minimal EGR also results in smaller EGR cooling system. The introduction of crankcase into the combustion chamber results in lowering of the particulates in the exhuast. The oil particles in the crankcase gas also improves intake valve life.