Abstract: Various methods and systems are provided for diagnosing an exhaust gas recirculation valve based on crankcase pressure. In one example, a method comprises indicating a condition of a valve disposed in a first exhaust passage downstream from a cylinder exhaust valve based at least in part on a crankcase pressure.

Abstract: Various methods and systems are provided for cooling exhaust system components. In one example, a system comprises heat shield surrounding at least a part of an engine exhaust passage valve positioned in an engine exhaust passage of an engine, and an air jet configured to direct compressed air into the heat shield. The heat shield contains the compressed air around an exterior of the at least the part of the engine exhaust passage valve.

Abstract: Various methods and systems are provided for blocking backflow of exhaust through an exhaust gas recirculation system. In one embodiment, a method comprises flowing exhaust gas through an exhaust gas recirculation (EGR) passage in a first direction from at least a first cylinder group of an engine to an intake manifold of the engine, the exhaust gas flowing in the first direction through a filter arranged in the EGR passage prior to reaching the intake manifold, and blocking flow of gas through the filter in a second, opposite direction with a mechanical one-way valve positioned in the EGR passage between the filter and the intake manifold.

Abstract: Various methods and systems are provided for regeneration of an exhaust gas recirculation cooler. One example method includes adjusting cooling of exhaust gas by an exhaust gas recirculation cooler to maintain a manifold air temperature during an idle condition of an engine. The method further includes initiating regeneration of the exhaust gas recirculation cooler during the idle condition when an effectivity of the exhaust gas recirculation cooler falls below a threshold effectivity prior to or during the idle condition.

Abstract: Various methods and systems are provided for controlling a hydraulically actuated engine valve. In one example, a system includes a hydraulically actuated engine valve and an engine having a first hydraulic system. The system further includes a second hydraulic system, which is separate from the first hydraulic system, and where the second hydraulic system provides fluid pressure to actuate the valve.

Abstract: Various methods and systems are provided for cooling exhaust system components. In one example, a method comprises directing compressed air onto an exterior of an engine exhaust passage valve.

Abstract: An engine system includes a first cylinder group, a second cylinder group, an inlet manifold coupled to the first cylinder group and the second cylinder group, an inlet passage coupled to the inlet manifold to provide inlet air to the inlet manifold, a first exhaust manifold coupled to the first cylinder group, a second exhaust manifold coupled to the second cylinder group, and a mixer pipe positioned within the second exhaust manifold and/or the intake passage to mix exhaust gas recirculation (EGR) gases exhausted by the second cylinder group that are delivered through the second exhaust manifold with inlet air. The mixer pipe forms an inlet end that is coupled to the second exhaust manifold and an outlet end that is located upstream of the cylinders in the first cylinder group and the cylinders in the second cylinder group.

Abstract: Various methods and systems are provided for a hydraulically actuated engine valve. In one example, a method includes receiving an indication of a temperature of an exhaust flow exceeding a threshold temperature. The method further includes responsive to the indication, increasing a flow, in a hydraulically actuated valve system having a valve and an actuator in thermal communication with the exhaust flow, of hydraulic fluid through the actuator, to manage a temperature of the actuator.

Abstract: Various methods and systems are provided for detecting particles generated from engine component degradation within an engine system. In one embodiment, a method for an engine comprises indicating engine degradation in response to a buildup of particles in a magnetic field, the magnetic field positioned in a flow of gas.

Abstract: Various methods and systems are provided for blocking backflow of exhaust through an exhaust gas recirculation system. In one embodiment, a method comprises flowing exhaust gas through an exhaust gas recirculation (EGR) passage in a first direction from at least a first cylinder group of an engine to an intake manifold of the engine, the exhaust gas flowing in the first direction through a filter arranged in the EGR passage prior to reaching the intake manifold, and blocking flow of gas through the filter in a second, opposite direction with a mechanical one-way valve positioned in the EGR passage between the filter and the intake manifold.

Abstract: Methods and systems for distributing engine output among vehicles of a consist are disclosed. One example system comprises a controller including non-transitory media having instructions stored on the media and executed by the controller for adjusting distribution of engine output between at least a first engine and a second engine in response to a regeneration mode, wherein the regeneration mode regenerates an exhaust gas recirculation (EGR) cooler that is coupled to the first engine.

Abstract: Various methods and systems are provided for diagnosing an engine component condition in an exhaust gas recirculation system. In one example, a method includes selectively routing exhaust from a subset of engine cylinders to an exhaust passage via a first valve and to an intake passage via a second valve, and obtaining one or more of a pressure or temperature from the subset of engine cylinders. The method further includes indicating an engine component condition based on the one or more of the pressure or temperature.

Abstract: Various methods and systems are provided for separating particles within a gas flow traveling through a gas flow passage of an engine. In one embodiment, a particle separator includes a plurality of vanes positioned across a gas flow passage through which gas flow passes, the plurality of vanes angled with respect to a flow direction of the gas flow, and a particle trap for collecting separated particles, the particle trap disposed in the gas flow passage.

Abstract: Various methods and systems are provided for regenerating an exhaust gas recirculation cooler. One example method includes, initiating an EGR cooler regeneration mode, wherein the EGR cooler regeneration mode comprises changing a fuel distribution of a donor cylinder group relative to a non-donor cylinder group of an engine, and increasing at least one of engine speed or load of the engine.

Abstract: Various methods and systems are provided for regenerating an exhaust gas recirculation cooler. One example method includes, routing exhaust gas from a donor cylinder group of an engine to an intake passage of the engine through the exhaust gas recirculation cooler, routing exhaust gas from a non-donor cylinder group of the engine to an exhaust passage of the engine, and adjusting fuel distribution among the donor cylinder group and the non-donor cylinder group responsive to a temperature of the exhaust gas recirculation cooler.

Abstract: Methods and systems for distributing engine output among rail vehicles of a consist are disclosed. One method comprises, adjusting redistribution of engine output from at least a first engine to at least a second engine based on a particulate filter regeneration of a filter coupled to the second engine.

Abstract: Various methods and systems are provided for detecting particles generated from engine component degradation within an engine system. In one embodiment, a method for an engine comprises indicating engine degradation in response to a buildup of particles in a magnetic field, the magnetic field positioned in a flow of gas.

Abstract: Various methods and systems are provided for cooling exhaust system components. In one example, a method comprises directing compressed air onto an exterior of an engine exhaust passage valve.

Abstract: Various methods and systems are provided for cooling exhaust system components. In one example, a system comprises heat shield surrounding at least a part of an engine exhaust passage valve positioned in an engine exhaust passage of an engine, and an air jet configured to direct compressed air into the heat shield. The heat shield contains the compressed air around an exterior of the at least the part of the engine exhaust passage valve.