Patent ID: 6138651
Filing Date: 2000-10-31
Classification: F02M

Abstract:
An exhaust gas recirculation system for an engine, comprising:an exhaust system for carrying exhaust gas away from the engine;an intake system comprising a pipe arrangement for distributing intake air to cylinders of the engine, the pipe arrangement comprising a collector section, a plurality of branches leading from the collector section, respectively, to the cylinders of the engine, and an intake passage section for introducing the intake air into the collector section, the intake system further comprising a throttle valve disposed in the intake passage section at an intermediate position dividing the intake passage section into an upstream intake passage subsection on an upstream side of the throttle valve and a downstream intake passage subsection extending from the throttle valve to the collector section; andan EGR system for returning part of the exhaust gas as EGR gas from the exhaust system into the downstream passage subsection of the intake system, the EGR system comprising an EGR gas introduction port having an EGR gas introduction opening for directing an inflow EGR gas stream into the downstream passage subsection, the EGR gas introduction opening being located downstream of a first free end of the throttle valve in a closed position, the EGR gas introduction port extending along a tangential direction tangential to a curved inside wall surface of the downstream passage subsection.