Methods and systems are provided for an engine. In one example, a method comprises stopping an engine via a soft-stop method in response to a likelihood of condensate forming being less than or equal to a threshold likelihood. The method further comprises stopping the engine via an exhaust gas evacuation method in response to the likelihood of condensate forming being greater than the threshold likelihood.

An internal combustion engine is provided with a turbocharger having a compressor section and a turbine section. The turbine section is in communication with an exhaust manifold of the engine. The compressor section includes an exhaust gas recirculation passage in communication with the exhaust gas recirculation line and a variable inlet in communication with the exhaust gas recirculation passage that provides the turbocharged engine with a wider operating range and improved efficiency.

Embodiments for inducing swirl upstream of a compressor are provided. In one example, a method includes during a first condition, flowing exhaust gas from downstream of a turbine to upstream of a compressor via a tangential flow duct of an exhaust gas recirculation (EGR) injector circumferentially surrounding an intake passage upstream of the compressor, and during a second condition, flowing exhaust gas from downstream of the turbine to upstream of the compressor via a radial flow duct of the EGR injector.

A vehicle controller is configured to execute a duty cycle control process of alternately repeating an electric power generation execution period and an electric power generation stop period of an electric generator and controlling a duty cycle, which is a ratio of the electric power generation execution period to a single cycle of repeated cycles, when determining that an anomaly has occurred in a driving circuit. The duty cycle control process includes at least one of two processes, a process of setting the duty cycle to be larger when a member in an overheatable region, in which overheating is possibly performed by the heater, has a low temperature than when the member has a high temperature and a process of setting the duty cycle to be larger when an internal combustion engine has a large intake air amount than when the engine has a small intake air amount.

Methods and systems are provided for reducing exhaust residuals during light load conditions in a split exhaust engine via a check valve. In one example, a scavenge exhaust manifold may be maintained above a threshold pressure by introducing fresh air into the scavenge manifold during a valve overlap period, the scavenge manifold coupled to a cylinder of an engine and coupled to an intake passage of the engine.

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 valve assembly includes: a rotary gear being rotated about a vertical central axis that is a rotational axis by force from an outside, and having a non-circular insertion hole on the central axis; a cylindrical cam being able to move up and down while rotating integrally with the rotary gear with an upper end thereof inserted in the insertion hole, and having two or more inclined slide grooves on an outer side thereof; a poppet shaft disposed through the rotational axis of the cylindrical cam to be able to move up and down integrally with and rotate independently from the cylindrical cam; a valve seat coupled to a lower portion of the poppet shaft; a housing and a cover that surround the cylindrical cam; and two or more bearing unit each having a first side fixed to the housing and having second sides respectively inserted in the slide grooves.

An internal combustion engine includes a supercharger having a compressor and a turbine and an EGR apparatus having an exhaust recirculating pipe, an upstream EGR valve and a downstream EGR valve. An electronic control unit fully opens the upstream EGR valve and controls an EGR amount by the downstream EGR valve when a peak value of an exhaust pressure increases excessively. The resulting increase in exhaust volume causes the peak value of the exhaust pressure to fall, and damage to parts of an exhaust system can be avoided. The electronic control unit fully opens the downstream EGR valve and controls the EGR amount by the upstream EGR valve when the peak value of the exhaust pressure decreases excessively. The resulting decrease in the exhaust volume causes the peak value of the exhaust pressure to rise, enabling supercharging.

A vehicle having an engine system which can detect an expected compressor surge event while the compressor is operating in a stable region of a compressor map, and upon detecting the expected compressor surge event controlling one or more engine operating parameters to maintain compressor operation in the stable region of the compressor map without transgressing (or mitigating the transgression of) a compressor surge line on the compressor map which, if transgressed, may cause compressor surge to occur.

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.