Engine with exhaust gas recirculation system and variable geometry turbocharger

An engine assembly comprising:

• an intake assembly;
• a spark-ignited internal combustion engine defining a plurality of cylinders and configured to combust a fuel;
• wherein the plurality of cylinders includes a first cylinder, a second cylinder, a third cylinder, and a fourth cylinder, wherein the plurality of cylinders combust fuel sequentially in the order of the first cylinder, the third cylinder, the fourth cylinder, and the second cylinder;
• wherein each of the plurality of cylinders is in fluid communication with the intake assembly;
• wherein combustion of the fuel occurs within the plurality of cylinders and produces an exhaust gas;
• an exhaust assembly in fluid communication with a first subset of the plurality of cylinders, the exhaust assembly including a first exhaust manifold, a second exhaust manifold, and an EGR manifold;
• wherein the first exhaust manifold receives the produced exhaust gas from the first cylinder;
• wherein the second exhaust manifold receives the produced exhaust gas from both the second cylinder and the third cylinder;
• wherein the EGR manifold is a dedicated EGR manifold that receives all of the produced exhaust gas from the fourth cylinder and is configured to route all of the exhaust gas from the fourth cylinder to the intake assembly;
• and
• a turbocharger including:
• a compressor in fluid communication with the intake assembly;
• a variable geometry turbine in fluid communication with the first exhaust manifold and with the second exhaust manifold;
• and
• wherein the compressor and variable geometry turbine are operatively connected through a shaft.

An engine assembly comprising:

• an intake assembly;
• a spark-ignited internal combustion engine defining a plurality of cylinders and configured to combust a fuel;
• wherein the plurality of cylinders includes a first cylinder, a second cylinder, a third cylinder, and a fourth cylinder;
• wherein each of the plurality of cylinders is in fluid communication with the intake assembly;
• wherein combustion of the fuel occurs within the plurality of cylinders and produces an exhaust gas;
• an exhaust assembly in fluid communication with a first subset of the plurality of cylinders, the exhaust assembly including a first exhaust manifold, a second exhaust manifold, and an EGR manifold;
• wherein the first exhaust manifold receives the produced exhaust gas from the first cylinder;
• wherein the second exhaust manifold receives the produced exhaust gas from both the second cylinder and the third cylinder;
• wherein the EGR manifold is a dedicated EGR manifold that receives all of the produced exhaust gas from the fourth cylinder and is configured to route all of the exhaust gas from the fourth cylinder to the intake assembly;
• and
• a turbocharger including:
• a compressor in fluid communication with the intake assembly;
• a variable geometry turbine in fluid communication with the first exhaust manifold and with the second exhaust manifold, the variable geometry turbine including a rotatable turbine wheel and a plurality of articulating veins circumferentially disposed about the rotatable turbine wheel, wherein the plurality of articulating veins are configured to controllably nozzle the exhaust gas to the rotatable turbine wheel;
• and
• wherein the compressor and variable geometry turbine are operatively connected through a shaft.