Abstract: An engine system is disclosed. The engine system includes an engine, an intake system for providing intake air to the engine and an exhaust system receiving exhaust gas from the engine. The engine system also includes a first exhaust turbine arranged downstream of the engine and a second and third exhaust turbines coupled in parallel and arranged downstream of the first exhaust turbine. A first valve is associated with the second and third exhaust turbines, the first valve configured to at least partially restrict exhaust gas to one of the second and third exhaust turbines and increase exhaust gas to the other turbine. The engine system also includes an exhaust gas recirculation system configured to redirect at least a portion of exhaust gas from the exhaust system to the intake system.

Abstract: An engine system is disclosed. The engine system includes an engine, an intake system for providing intake air to the engine and an exhaust system receiving exhaust gas from the engine. The engine system also includes a first exhaust turbine arranged downstream of the engine and a second and third exhaust turbines coupled in parallel and arranged downstream of the first exhaust turbine. A first valve is associated with the second and third exhaust turbines, the first valve configured to at least partially restrict exhaust gas to one of the second and third exhaust turbines and increase exhaust gas to the other turbine. The engine system also includes an exhaust gas recirculation system configured to redirect at least a portion of exhaust gas from the exhaust system to the intake system.

Abstract: An exhaust treatment system for an engine is disclosed and may have an air induction circuit, an exhaust circuit, and an exhaust recirculation circuit. The air induction circuit may be configured to direct air into the engine. The exhaust circuit may be configured to direct exhaust from the engine and include a turbine driven by the exhaust, a particulate filter disposed in series with and downstream of the turbine, and a catalytic device disposed in series with and downstream of the particulate filter. The exhaust recirculation circuit may be configured to selectively redirect at least some of the exhaust from between the particulate filter and the catalytic device to the air induction circuit. The catalytic device is selected to create backpressure within the exhaust circuit sufficient to ensure that, under normal engine operating conditions above low idle, exhaust can flow into the air induction circuit without throttling of the air.

Abstract: A power system is provided having a power source, a first power source section with a first intake passage and a first exhaust passage, a second power source section with a second intake passage and a second exhaust passage, and an oxygen separator. The second intake passage may be fluidly isolated from the first intake passage.