Exhaust bypass system for turbocharged engine with dedicated exhaust gas recirculation

An exhaust gas recirculation system for an internal combustion engine, the exhaust gas recirculation system comprising:

• an exhaust manifold including:
• a first group of runners joining to define a first exit and configured for directing exhaust gas from a first group of exhaust ports to the first exit;
• a second group of runners joining to define a second exit and configured for directing exhaust gas from a second group of exhaust ports to the second exit;
• and
• an EGR bypass passage in fluid communication with the second group of runners and the second exit, and defining a bypass exit, wherein the EGR bypass passage is configured for directing exhaust gas from the second group of runners to the bypass exit;
• a turbocharger assembly attached to the exhaust manifold and including a housing supporting a turbine and defining a first inlet in fluid communication with the first exit, and a turbine passage interconnecting the first inlet and the turbine in fluid communication, wherein the turbine passage is configured for directing exhaust gas from the first inlet to the turbine;
• wherein the housing of the turbocharger assembly further defines a second inlet in fluid communication with the second exit, and a housing bypass passage interconnecting the second inlet and the turbine passage in fluid communication, wherein only the housing bypass passage connects the second inlet and the turbine passage in fluid communication, and wherein the housing bypass passage is configured for directing exhaust gas from the second inlet to the turbine;
• wherein the turbocharger assembly includes a bypass valve supported by the housing and disposed within the housing bypass passage, wherein the bypass valve is moveable between an open position and a closed position, wherein the bypass valve is configured for allowing a flow of exhaust gas through the housing bypass passage when in the open position, and wherein the bypass valve is configured to block the flow of exhaust gas through the housing bypass passage when in the closed position to block the flow of exhaust gas between the second group of exhaust ports and the turbine;
• an EGR passage attached to the exhaust manifold and in fluid communication with the bypass exit, wherein the EGR passage is configured for directing exhaust gas from the bypass exit to an intake manifold;
• and
• an EGR control valve disposed within the EGR passage and moveable between an open position and a closed position, wherein the EGR control valve is configured to allow a flow of exhaust gas through the EGR passage when in the open position, and wherein the EGR control valve is configured to block the flow of exhaust gas through the EGR passage when in the closed position.