초록 ▼

A system and method for exhaust gas recirculation (EGR) in a heavy-duty diesel engine is disclosed. The disclosed EGR system comprises an EGR conduit, an EGR valve, an EGR cooler, and an EGR driver such as an auxiliary compressor driven by the exhaust gas driven turbine of the engine to forcibly dri

A system and method for exhaust gas recirculation (EGR) in a heavy-duty diesel engine is disclosed. The disclosed EGR system comprises an EGR conduit, an EGR valve, an EGR cooler, and an EGR driver such as an auxiliary compressor driven by the exhaust gas driven turbine of the engine to forcibly drive the recirculated exhaust gas from the exhaust manifold via an EGR conduit to the intake manifold when the EGR valve is open. The disclosed EGR system also includes an EGR bypass conduit, the flow through which is governed by an electronically controlled EGR bypass valve. The EGR system also includes an ECM that controls the EGR bypass valve such that a flow of exhaust gas is directed through the EGR conduit and EGR driver during selected engine operating conditions where the primary EGR valve is open (i.e. EGR is on) and directs a flow of air from the intake through the EGR bypass conduit and EGR driver when EGR valve is closed (i.e. EGR is off). In addition, the ECM optionally controls the EGR bypass valve such that a flow of exhaust gas from the exhaust manifold is directed through the EGR bypass conduit to the intake manifold when the exhaust manifold pressure is greater than the intake manifold pressure.

대표청구항 ▼

[What is claimed is:] [1.]an exhaust gas recirculation primary conduit fluidically coupling an exhaust manifold with an intake manifold;an exhaust gas recirculation valve disposed along said exhaust gas recirculation primary conduit proximate said exhaust manifold;an exhaust gas recirculation driver

[What is claimed is:] [1.]an exhaust gas recirculation primary conduit fluidically coupling an exhaust manifold with an intake manifold;an exhaust gas recirculation valve disposed along said exhaust gas recirculation primary conduit proximate said exhaust manifold;an exhaust gas recirculation driver disposed along said exhaust gas recirculation conduit and adapted for forcibly driving said recirculated exhaust gas to said intake manifold;an exhaust gas recirculation bypass conduit in fluidic communication with said exhaust gas recirculation primary conduit while circumventing said exhaust gas recirculation driver; andan exhaust gas recirculation bypass valve disposed along said exhaust gas recirculation bypass conduit.