An internal combustion engine for a motor vehicle includes a drive shaft, an intake tract, an exhaust gas tract, an exhaust gas aftertreatment device disposed in the exhaust gas tract, a heating element disposed in the exhaust gas tract upstream of the exhaust gas aftertreatment device, an electrically assisted exhaust gas turbocharger, and a conduit element which is fluidically connected to the exhaust gas tract at a first connection point disposed downstream of the exhaust gas aftertreatment device and at a second connection point disposed upstream of the heating element.

An internal combustion engine includes an exhaust conduit having an exhaust port fluidically coupled to ambient fluid and having an internal cross-sectional area and an engine cylinder fluidically coupled to the exhaust conduit. A fluidic amplifier is disposed within the exhaust conduit and is fluidically coupled to the engine cylinder. The amplifier is further fluidically coupled to a source of primary fluid and is configured to introduce the primary fluid and at least a portion of fluid from the engine cylinder to the exhaust port.

Various embodiments of the teachings herein include a method for heating a catalytic converter arranged in an exhaust-gas tract of an internal combustion engine and comprising an electric heating device. An example method may include: activating the electric heating device with a specified heating power at a time before the internal combustion engine is started; monitoring the catalyst temperature in a region of the catalytic converter adjacent the heating device; before the catalyst temperature has reached a predetermined first threshold value, supplying a secondary air mass flow with a first flow rate is supplied into the exhaust-gas tract upstream of the catalytic converter; and after the catalyst temperature has reached the predetermined first threshold value, increasing the secondary air mass flow to a second flow rate greater than the first flow rate.

Methods and systems are provided for expediting emission control device heating. In one example, a method may include flowing air from an intake of an engine to one or more emission control devices via an air injection system while operating a turbocharger via an electric motor to maintain a desired airflow to the engine in response to an emission control device heating condition. In this way, fresh air is provided to the one or more emission control devices without degrading engine performance or increasing engine speed.

An injection controller that is applied to an exhaust purification system including an injector that is located in an exhaust passage of an internal combustion engine and injects to supply a reducing agent in a liquid state to a NOx purification catalyst purifying NOx in an exhaust gas, and a pump that pressurizes and pumps the reducing agent to the injector through a reducing-agent passage. The injection controller includes an acquisition unit configured to acquire a variation quantity of a rotational speed of the pump caused in response to an injection of the injector or a correlation value that is a value correlative to the variation quantity, as a rotational variation parameter, and a determination unit configured to determine whether an air mixing exists in the reducing-agent passage based on the rotational variation parameter.

An air intake and exhaust system for a marine engine having an intake manifold and an exhaust manifold includes an air compressor configured to compress ambient air into compressed air and a catalytic converter assembly configured to convert pollutants in an exhaust gas stream received from the exhaust manifold. The air compressor is configured to be fluidly coupled to the intake manifold of the engine for directing at least a first portion of the compressed air to the intake manifold of the engine. The air compressor is also selectively fluidly coupled to the catalytic converter assembly for selectively directing a second portion of the compressed air into the exhaust gas stream at a secondary air injection location at or upstream of the catalytic converter assembly.

A heat shield includes an outer jacket including a fluid inlet port and a fluid outlet port, and an inner jacket nested within the outer jacket and spaced apart therefrom to define a fluid passageway therebetween. The fluid passageway is in fluid communication with the fluid inlet port and the fluid outlet port for directing a cooling fluid from the fluid inlet port to the fluid outlet port through the fluid passageway. The inner jacket at least partially defines a main cavity configured to at least partially protect a turbocharger of the marine engine.

A method and a corresponding apparatus are provided for preconditioning an exhaust gas system (100) for discharging and purifying combustion exhaust gases of an internal combustion engine (1), in particular an internal combustion engine (1) of a motor vehicle (200). The method includes operating, air being heated by a heating element (8) in the exhaust gas system (100) to heat air in the exhaust gas system (100), operating a fan in the exhaust gas system (100) for producing a hot air stream with the heated air, using the hot air stream for heating a first catalytic converter (7) of the exhaust gas system (100) to a minimum operating temperature.

The present application relates to an arrangement for a marine vessel, comprising a combustion unit arranged in an engine room of the marine vessel, an exhaust gas cleaning system in flow connection with the combustion unit and being arranged for receiving and for cleaning the exhaust gas from the combustion unit to a cleaned exhaust gas, a cleaned gas exhaust pipe being in flow connection with the exhaust gas cleaning system and arranged for receiving the cleaned exhaust gas, a plume control system, comprising an air intake for taking in ambient air, a heater for heating the ambient air producing heated air, and a gas mixer placed in the cleaned gas exhaust pipe and arranged for mixing the cleaned exhaust gas in the cleaned gas exhaust pipe with the heated air resulting in an exhaust gas mixture that is blown out into the atmosphere via the one or more exhaust gas outlets. The application furthermore relates to a method for avoiding that exhaust gas that is created in a combustion unit in an engine room of a marine vessel and that is cleaned in an exhaust gas cleaning system that is in flow connection with an cleaned gas exhaust pipe which in its turn is in flow connection with one or more exhaust gas outlets, preferably arranged in a casing, and arranged for blowing out the exhaust gas into the atmosphere, descends and grounds on the marine vessel and/or other adjacent areas.

Methods and systems are provided for removing moisture from an engine exhaust system. In one example, a method includes, during a vehicle key-off condition, in response to a higher than threshold exhaust moisture level and a lower than threshold engine run time during an immediately prior drive cycle, operating an electric air compressor to remove the moisture accumulated in the exhaust manifold.