A method for preventing an engine air flow calculation error applied to an engine system may classify an engine operation area of an engine into a sensor measurement deviation generation area, medium/high load areas, and a low load area by an ECU, and classify an air flow calculation applied to a cylinder charging amount of the engine as one of an air flow calculation control applying a compensation measurement air flow to the sensor measurement deviation generation area, an air flow calculation control applying a measurement pressure to the medium/high load areas, and an air flow calculation control applying a measurement air flow to the low load area, excluding influence of an HFM sensor error causing a change in a fresh air charge and inaccuracy of an exhaust gas recirculation (EGR) air flow modeling/active purge air flow modeling in the entire operation area of the engine.

Various methods and systems are provided for an exhaust gas recirculation system. In one embodiment, an engine method comprises routing exhaust gas from a first cylinder group of an engine to an exhaust gas recirculation passage coupled to both an intake passage and an exhaust passage of the engine, the first cylinder group having a first amount of positive intake and exhaust valve overlap, and routing exhaust gas from a second cylinder group of the engine only to the exhaust passage of the engine, the second cylinder group having a second, smaller amount of positive intake and exhaust valve overlap.

An exhaust valve comprises a substantially tubular body, defining a passage section and extending along an extension axis, and a flap positioned in the tubular body across the passage section. The flap rotates about an axis of rotation, secant to the extension axis, between a closed orientation where the flap closes off the passage section and an open orientation where the flap frees the passage section. The tubular body comprises two flanges that are substantially symmetrical to one another and an annular sealing ring is positioned and maintained between the two flanges.

A convergent nozzle is in a mixer housing and in a flow path from an air inlet of the mixer to an outlet of the mixer. A convergent-divergent nozzle is in the mixer housing and includes an air-exhaust gas inlet in fluid communication to receive fluid flow from the convergent nozzle and from the interior of the exhaust gas housing. A first nozzle module is configured to be received in the mixer housing and, when received in the mixer housing, define at least a portion of the convergent nozzle or the convergent-divergent nozzle. A second nozzle module is configured to be received in the mixer housing separate from the first nozzle module. The second nozzle module, when received in the mixer housing, is configured to define at least a portion of the convergent or the convergent-divergent nozzle. The second nozzle module has a different flow characteristic than the first nozzle module.

A convergent nozzle is in a mixer housing and in a flow path from an air inlet of the mixer to an outlet of the mixer. A convergent-divergent nozzle is in the mixer housing and includes an air-exhaust gas inlet in fluid communication to receive fluid flow from the convergent nozzle and from the interior of the exhaust gas housing. A first nozzle module is configured to be received in the mixer housing and, when received in the mixer housing, define at least a portion of the convergent nozzle or the convergent-divergent nozzle. A second nozzle module is configured to be received in the mixer housing separate from the first nozzle module. The second nozzle module, when received in the mixer housing, is configured to define at least a portion of the convergent or the convergent-divergent nozzle. The second nozzle module has a different flow characteristic than the first nozzle module.

Systems, methods and apparatus are disclosed for producing a target pressure differential across an intake air throttle of an internal combustion engine by opening or closing a turbocharger wastegate to a commanded position that provides an opening through the wastegate having an effective area based on the target pressure differential.

Multiple convergent nozzles define multiple flow passages in a flow path from an air inlet of the mixer to an outlet of the mixer. The convergent nozzles each converge toward the outlet of the mixer. An exhaust gas housing includes an exhaust gas inlet leading into an interior of the exhaust gas housing. Multiple convergent-divergent nozzles each correspond to one of the plurality of convergent nozzles. The convergent-divergent nozzles each include an air-exhaust gas inlet in fluid communication to receive fluid flow from a corresponding convergent nozzle and the interior of the exhaust gas housing.

Methods and systems are provided for coordinated operation of electric variable geometry turbocharger (e-VGT), an exhaust gas recirculation (EGR), and electric motor coupled to the e-VGT for expedited catalyst light-off. In one example, a method may include, during a cold-start, decreasing each of an opening of e-VGT vanes and an opening of an EGR valve while operating the electric motor for braking and reducing the e-VGT speed.

Methods and systems are provided for coordinated operation of electric variable geometry turbocharger (e-VGT), an exhaust gas recirculation (EGR), and electric motor coupled to the e-VGT for expedited catalyst light-off. In one example, a method may include, during a cold-start, decreasing each of an opening of e-VGT vanes and an opening of an EGR valve while operating the electric motor for braking and reducing the e-VGT speed.

A device for controlling the amount of fluid fed to the intake of a supercharged internal-combustion engine includes at least one turbocharger with a compression stage including at least one compressor with an intake for the fluid to be compressed, an expansion stage with at least one turbine having at least one exhaust gas inlet and expanded exhaust gas outlet, a transfer line for carrying the compressed fluid from the compressor outlet to the at least one turbine inlet with throttling means for controlling the compressed fluid transfer to the turbine, and an exhaust gas recirculation line between exhaust gas outlet of turbine and intake of compressor.