An engine exhaust aftertreatment device, comprising a first exhaust treatment unit and/or a second exhaust treatment unit; the first exhaust treatment unit comprises a first bypass pipeline (1) and a first connection pipe (4) provided between a DPF (2) and an SCR (3), one end of the first bypass pipeline (1) being in communication with a turbine front exhaust pipe (9), and the other end of the first bypass pipeline being in communication with the first connection pipe (4); the second exhaust treatment unit comprises a second bypass pipeline (19) and a second connection pipeline (20) provided between a DOC (13) and the DPF (2), one end of the second bypass pipeline (19) being in communication with the turbine front exhaust pipe (9), and the other end of the second bypass pipeline being in communication with the second connection pipeline (20); when it is detected that an engine (11) satisfies a starting condition of the first exhaust treatment unit, the first exhaust treatment unit starts; and when it is detected that the engine (11) satisfies a starting condition of the second exhaust treatment unit, the second exhaust treatment unit starts. Said device and method greatly improve the exhaust treatment efficiency and reduce the risk of exhaust excessive emission.

An internal combustion engine for a motor vehicle includes an exhaust system through which exhaust gas can flow and in which a first exhaust gas aftertreatment element is disposed. An exhaust gas turbocharger has a turbine and the turbine has a turbine wheel which is disposed upstream of the first exhaust gas aftertreatment element. A bypass line bypasses the turbine wheel and via the bypass line at least part of the exhaust gas can bypass the turbine wheel. The bypass line also bypasses the first exhaust gas aftertreatment element. The bypass line is fluidically connected to the exhaust system at a branch point disposed upstream of the turbine wheel and upstream of the first exhaust gas aftertreatment element. The bypass line is fluidically connected to the exhaust system at a discharge point disposed downstream of the turbine wheel and downstream of the first exhaust gas aftertreatment element.

An exhaust gas treatment system is provided for an exhaust system of an internal combustion engine. The exhaust gas treatment system includes a plurality of SCR catalytic converter units (32, 34, 36) connected in parallel to one another. At least one SCR catalytic converter unit (32, 34, 36) of the SCR catalytic converter units (32, 34, 36) is connected in parallel to one another can optionally be released and blocked for the flow of exhaust gas.

The present disclosure relates to a combustion engine system and a method of operation thereof. The combustion engine system includes a pollutant conversion system and an exhaust gas turbocharger that includes a variable turbine geometry and a waste gate valve. The variable turbine geometry includes adjustable guide elements surrounding the turbine wheel in a circumferential direction and are arranged to define an overall cross-section in their respective position for the exhaust gas. In a control mode where the pollutant conversion system comprises a temperature above a threshold temperature, the guide elements are adjusted such that the overall cross-section is between a control minimum value and a control maximum value. In a heat-up mode at temperatures of the pollutant conversion system below the threshold temperature, the guide elements are moved to a heat-up position where the overall cross-section is smaller than the control minimum value.

Methods and systems are provided for extending a duration of engine idle-stop while reducing a frequency of engine restart from idle-stop. In one example, in response to engine restart conditions where combustion torque is not necessary, an engine can be rotated electrically, without fuel delivery, via an electric motor. The unfueled engine spinning via the motor drives an FEAD which in turns drives an actuator coupled to the FEAD, such as an AC compressor or an automatic transmission oil pump.

Methods and systems are provided for operating a branched exhaust assembly in a vehicle engine in order to increase catalyst efficiency and reduce engine emissions. In one example, a method may include, during a cold-start condition, flowing exhaust first through a three-way catalyst then through an underbody converter, then through a heat exchanger and then through a turbine, each exhaust component housed on different branches on the branched exhaust assembly. After catalyst activation, exhaust may flow first through the turbine, then through the underbody converter and then through the three-way catalyst, and during high engine load, exhaust entering the turbine may be cooled in order to reduce thermal load on the turbine.

A heat exchanger includes: a hollow pillar shaped honeycomb structure; a first cylindrical member fitted to a surface of an outer peripheral wall of the pillar shaped honeycomb structure; a second cylindrical member fitted to a surface of an inner peripheral wall of the pillar shaped honeycomb structure; a cylindrical guide member having a portion, the portion being disposed on a radially inner side of the second cylindrical member with a distance so as to form the flow path for the first fluid; an upstream cylindrical member connecting an upstream end of the first cylindrical member to an upstream side of the guide member; and a downstream cylindrical member connected to a downstream end of the first cylindrical member. The guide member includes an inclined portion that inclines to its downstream side.

An exhaust heat recovery apparatus is installed proximate an engine and at a front side of a warm-up catalytic converter in an exhaust system, where the exhaust system includes an exhaust line connected with the engine, and the warm-up catalytic converter is installed at the exhaust line. The exhaust heat recovery apparatus includes a bellows unit which is of a dual-pipe type and exchanges heat between exhaust gas emitted through the exhaust line and coolant circulating from a cooling system to the engine.

A thermoelectric generator for a vehicle utilizing heat of exhaust gas discharged from an engine of the vehicle includes a heat exchange unit, through which a coolant circulates, a thermoelectric generation unit for converting thermal energy of exhaust gas into electrical energy, a first flow passage for guiding the exhaust gas to pass through the heat exchange unit, a second flow passage for guiding the exhaust gas to pass through the thermoelectric generation unit, a third flow passage for guiding the exhaust gas to bypass the heat exchange unit and the thermoelectric generation unit without passing therethrough, a first valve for opening or closing the first flow passage, a second valve for selectively opening or closing the second flow passage and the third flow passage, and a driving unit for operating the first valve and the second valve by a single power source.

An exhaust gas system (1) has a main flow path (2) with an exhaust gas aftertreatment device (4), and a bypass flow path (3) that has a fan (5) and a heating apparatus (6). The bypass flow path (3) has opposite ends connected to the main flow path (2) in regions upstream and downstream of the exhaust gas aftertreatment device (4). A shut-off (7) is arranged in the main flow path (2) upstream of the bypass flow path, and a further shut-off (8) is arranged in the main flow path downstream of the bypass flow path.