| 摘要 |
The EGR system (10) includes a recirculation conduit (34) for recirculating a volume of exhaust gas from the exhaust manifold (16) to the intake manifold (14); a cooling air conduit (36) for transporting a flow of cooling air; and a gas-to-air heat exchanger (46) disposed in operative association with the recirculation conduit (34) and the cooling air conduit (36) and adapted for cooling the volume of recirculated exhaust gas in the recirculation conduit (34). The cooling air passing through the gas-to air heat exchanger (46) can be diverted from the pressurized intake air, cooled (ATAAC) air, or even fresh ambient air obtained from a source external to said engine (12) and which optionally may be forcibly directed through the heat exchanger (46) via a blower (56, Fig.2). The disclosed embodiments disclose EGR systems where the exhaust gases are driven from the exhaust manifold (16) to the intake manifold (14) through different techniques including peak clipping EGR systems, venturi based EGR systems, pumped EGR systems or piston pumped EGR systems. |
