Abstract: An Exhaust Gas Recirculation (EGR) system for an engine system is provided. The EGR system includes an exhaust gas treatment module positioned upstream of an EGR cooler with respect to an exhaust gas flow direction. The exhaust gas treatment module is in selective fluid communication with an exhaust gas line of an engine. The EGR system also includes a bypass line in selective fluid communication with the exhaust gas line of the engine. The EGR system further includes a valve arrangement configured to route an exhaust gas flow through at least one of the exhaust gas treatment module and the bypass line.

Abstract: A system and method to selectively control intake air temperature of a dual fuel engine are provided. The dual fuel engine intake air temperature is automatically modified based on a determined fuel mode at which the dual fuel engine is operating or instructed to operate.

Abstract: The exhaust gas recirculation system includes a plurality of coolers arranged in a predefined configuration that are configured to receive a flow of exhaust gas and a flow of coolant therethrough. The exhaust gas recirculation system further includes plurality of valves associated with each of the plurality of coolers. The plurality of valves is configured to regulate at least one of the flows of exhaust gas and the coolant through the corresponding cooler. The exhaust gas recirculation system also includes a control unit configured to selectively switch opening and closing of the plurality of valves such that at least one of the flow of exhaust gas and the flow of coolant through at least one cooler of the plurality of coolers is regulated during an operation of the exhaust gas recirculation system, to actively regenerate the at least one cooler.

Abstract: An Exhaust Gas Recirculation (EGR) system for an engine system is provided. The EGR system includes an exhaust gas treatment module positioned upstream of an EGR cooler with respect to an exhaust gas flow direction. The exhaust gas treatment module is in selective fluid communication with an exhaust gas line of an engine. The EGR system also includes a bypass line in selective fluid communication with the exhaust gas line of the engine. The EGR system further includes a valve arrangement configured to route an exhaust gas flow through at least one of the exhaust gas treatment module and the bypass line.

Abstract: An engine system is disclosed for use with an engine having at least a first cylinder and a second cylinder. The engine system may have a first exhaust manifold fluidly connected to the first cylinder, a second exhaust manifold fluidly connected to the second cylinder, and a recirculation passage extending from the first exhaust manifold to at least one of the first and second cylinders. The engine system may also have a restricted orifice connecting the first exhaust manifold to the second exhaust manifold, a pressure relief passage extending from the first exhaust manifold, and a valve disposed within the pressure relief passage and movable to selectively reduce a back pressure of the first exhaust manifold.

Abstract: A two-stroke uniflow scavenged diesel engine system including an exhaust gas recirculation (EGR) system is described for reducing NOX emissions and achieving desired fuel economy by recirculating exhaust gas through the engine. More specifically, the present invention is directed to a pressure balance exhaust gas recirculation (EGR) assembly for a two-stroke locomotive diesel engine having an EGR system. The present pressure balance EGR assembly includes an EGR module adapted to define a space between the external housing wall of the DOC housing and the inner wall of the EGR module housing and a space between the external wall of the DPF housing and the inner wall of the EGR module housing. One side of each space is confined by a flange-gasket arrangement, whereas the other side of the space is in open communication with the outlet of the respective DOC or DPF such that a portion of the exhaust fills each space.

Abstract: An engine system for a machine is disclosed. The engine system may have an intake manifold configured to direct air into a donor cylinder and a non-donor cylinder of an engine. The engine system may also have a first exhaust manifold configured to direct exhaust from the non-donor cylinder to the atmosphere. The engine system may also have a second exhaust manifold configured to receive exhaust from the donor cylinder. The engine system may further have a control valve configured to selectively direct a first amount of exhaust from the second exhaust manifold to the intake manifold. In addition, the engine system may have an orifice configured to allow a second amount of exhaust to flow from the second exhaust manifold to the first exhaust manifold.

Abstract: An engine system for a machine is disclosed. The engine system may have an intake manifold configured to direct air into a donor cylinder and a non-donor cylinder of an engine. The engine system may also have a first exhaust manifold configured to direct exhaust from the non-donor cylinder to the atmosphere. The engine system may also have a second exhaust manifold configured to receive exhaust from the donor cylinder. The engine system may further have a control valve configured to selectively direct a first amount of exhaust from the second exhaust manifold to the intake manifold. In addition, the engine system may have an orifice configured to allow a second amount of exhaust to flow from the second exhaust manifold to the first exhaust manifold.

Abstract: An engine system for a machine is disclosed. The engine system may have an intake manifold configured to direct air into a donor cylinder and a non-donor cylinder of an engine. The engine system may have a first exhaust manifold configured to direct exhaust from the non-donor cylinder to the atmosphere and a second exhaust manifold configured to receive exhaust from the donor cylinder. The engine system may further have a control valve configured to selectively direct a first amount of exhaust from the second exhaust manifold to the intake manifold and an after-treatment component configured to treat the first amount of exhaust. In addition, the engine system may have a controller configured to adjust a first operating parameter of the donor cylinder such that a ratio of an amount of a gaseous component and an amount of particulate matter in the first amount of exhaust exceeds a predetermined threshold.

Abstract: An engine system for a machine is disclosed. The engine system may have an intake manifold configured to direct air into a donor cylinder and a non-donor cylinder of an engine. The engine system may also have a first exhaust manifold configured to direct exhaust from the non-donor cylinder to the atmosphere. The engine system may also have a second exhaust manifold configured to receive exhaust from the donor cylinder. The engine system may further have a control valve configured to selectively direct a first amount of exhaust from the second exhaust manifold to the intake manifold. In addition, the engine system may have an orifice configured to allow a second amount of exhaust to flow from the second exhaust manifold to the first exhaust manifold.

Abstract: An engine system is disclosed for use with an engine having at least a first cylinder and a second cylinder. The engine system may have a first exhaust manifold fluidly connected to the first cylinder, a second exhaust manifold fluidly connected to the second cylinder, and a recirculation passage extending from the first exhaust manifold to at least one of the first and second cylinders. The engine system may also have a restricted orifice connecting the first exhaust manifold to the second exhaust manifold, a pressure relief passage extending from the first exhaust manifold, and a valve disposed within the pressure relief passage and movable to selectively reduce a back pressure of the first exhaust manifold.

Abstract: An engine system for a machine is disclosed. The engine system may have an intake manifold configured to direct air into a donor cylinder and a non-donor cylinder of an engine. The engine system may have a first exhaust manifold configured to direct exhaust from the non-donor cylinder to the atmosphere and a second exhaust manifold configured to receive exhaust from the donor cylinder. The engine system may further have a control valve configured to selectively direct a first amount of exhaust from the second exhaust manifold to the intake manifold and an after-treatment component configured to treat the first amount of exhaust. In addition, the engine system may have a controller configured to adjust a first operating parameter of the donor cylinder such that a ratio of an amount of a gaseous component and an amount of particulate matter in the first amount of exhaust exceeds a predetermined threshold.

Abstract: In one aspect of the present disclosure, an exhaust emission reduction system is provided for an internal combustion engine. The engine receives an air stream for combustion with fuel in the engine and also generates an engine exhaust steam. The system includes a filter assembly having one or more exhaust emission reduction elements configured to process the exhaust stream, a performance of at least one of the one or more exhaust emission reduction elements being temperature dependent. The system also includes an apparatus for changing the temperature of the exhaust stream incident on the filter assembly. The system further includes a controller operatively connected to the apparatus, and adapted to regulate the temperature of the exhaust stream incident on the filter assembly based on the temperature of the exhaust stream.

Abstract: A two-stroke uniflow scavenged diesel engine system including an exhaust gas recirculation (EGR) system is described for reducing NOX emissions and achieving desired fuel economy by recirculating exhaust gas through the engine. More specifically, the present invention is directed to a pressure balance exhaust gas recirculation (EGR) assembly for a two-stroke locomotive diesel engine having an EGR system. The present pressure balance EGR assembly includes an EGR module adapted to define a space between the external housing wall of the DOC housing and the inner wall of the EGR module housing and a space between the external wall of the DPF housing and the inner wall of the EGR module housing. One side of each space is confined by a flange-gasket arrangement, whereas the other side of the space is in open communication with the outlet of the respective DOC or DPF such that a portion of the exhaust fills each space.

Abstract: A locomotive two-stroke uniflow scavenged diesel engine system including an exhaust gas recirculation (EGR) system is described for reducing NOX emissions and achieving improved fuel economy by recirculating exhaust gas through the engine. This system generally includes a turbocharger adapted to draw and compress fresh air. An aftercooler is coupled to the turbocharger adapted to cool the compressed air. A two-stroke uniflow scavenged diesel engine having a power assembly provides combustion and produces exhaust therefrom. The engine has a positive pressure gradient between the power assembly intake ports and the exhaust manifold to maintain scavenging and mixing in the power assembly. An EGR system includes a flow regulating device and a cooler. The flow regulating device is adapted to direct a select portion of the exhaust gas to be recirculated and direct the majority portion of the exhaust gas to the turbocharger.

Abstract: A locomotive two-stroke uniflow scavenged diesel engine system including an exhaust gas recirculation (EGR) system and apparatus is described for reducing NOx emissions and achieving improved fuel economy by recirculating exhaust gas through the engine. This system generally includes a turbocharger adapted to draw and compress fresh air. An aftercooler is coupled to the turbocharger adapted to cool the compressed air. A two-stroke uniflow scavenged diesel engine having a power assembly provides combustion and produces exhaust therefrom. The engine has a positive pressure gradient between the power assembly intake ports and the exhaust manifold to maintain scavenging and mixing in the power assembly. An EGR system includes a flow regulating device and a cooler. The flow regulating device is adapted to direct a select portion of the exhaust gas to be recirculated and direct the majority portion of the exhaust gas to the turbocharger.

Abstract: The present invention is directed to a locomotive two-stroke uniflow scavenged diesel engine system including an exhaust gas recirculation (EGR) system for reducing NOX emissions and achieving improved fuel economy by recirculating exhaust gas through the engine. The EGR system includes a flow regulating device and a cooler. The flow regulating device (e.g., a valve or positive flow device) is adapted to direct a select portion of the exhaust gas to be recirculated to the engine system. The cooler is coupled to the flow regulating device for decreasing the temperature of the exhaust gas. Additionally, a control system for the EGR system is provided which monitors and controls select components of any of the EGR systems described. Specifically, the control system may be adapted to control select components of an EGR system to adaptively regulate exhaust gas recirculation based on various operating conditions of the locomotive.

Abstract: The present invention is directed to an engine exhaust valve timing and lift system for a uniflow two-stroke locomotive diesel engine having an EGR system. This system and method reduces NOx emissions while attaining desired levels of cylinder scavenging and mixing. Specifically, the present invention engine exhaust valve system controls the timing, lift and velocity of exhaust valve opening and closing in order to attain the desired NOx emission levels and the desired levels of cylinder scavenging and mixing.

Abstract: A turbocharger rotor includes a turbine wheel, a compressor wheel, a shaft extending between the turbine and compressor wheels for rotation together about an axis, and connecting means. The connecting means include first and second joints including alignment couplings joining opposite ends of the shaft with adjoining inner ends of the compressor wheel and the turbine wheel. The couplings are configured to coaxially align and drivingly engage the shaft with the compressor and turbine wheels. A fastener rod extends through the shaft and the compressor wheel, engaging the turbine wheel to retain the rotor components together under compressive load. The rod is resiliently stretchable to limit changes in the retaining force changes in axial dimensions during operating and stationary conditions. Additional features and variations are disclosed.