The invention relates to a chamber mixer (10) for an exhaust after-treatment system of a motor vehicle, wherein a first fluid (12) can flow through the internal volume (18) of the chamber mixer in a through-flow direction (26), said internal volume being delimited by a housing (16), wherein at least one housing side of the housing (16) is double-walled and has an outer wall (30) and an inner wall (32) which divides the internal volume (18) into an inner chamber (34) and an outer chamber (36), wherein the fluid flowing in through an inlet opening (22) can be separated into a main flow (38) flowing through the inner chamber (34) and an auxiliary flow (40) flowing through the outer chamber (36), wherein the main flow (38) can be acted upon by means of a flow device (48) with a double swirl (50) and with a fluid introduction device (56) with an introduction end (58) which is arranged in the outer chamber (36) and via which a second fluid (14) can be injected into the inner chamber (34) through an introduction opening (60) in the inner wall (32).

The invention describes an internal combustion engine (14) for a vehicle (12) that comprises a fly-wheel (24) placed at the rear part with respect to the internal combustion engine (14), a cooling system (28) placed at the front part with respect to the internal combustion engine, a forced induction group consisting of a turbine (22), placed on the same side as the fly-wheel (24), and a compressor (30), placed on the same side as the cooling system (28), and a system (10) for treating the exhaust gases provided with a conduit for the inlet of exhaust gases, operatively connected to the exit door of the turbine, a conduit for the outlet of exhaust gases and a main body or shell (38) internally hollow for containing a substrate (44) through which the exhaust gases are conveyed so that they are subject to predefined chemical reactions. The system for treating exhaust gases is placed on the head of the internal combustion engine, the main body or shell has a cross-sectional shape, with respect to the driving direction of the vehicle, of an ellipsoid the larger axis of which is oriented according to a substantially horizontal direction and the smaller axis of which is oriented according to a substantially vertical direction, so that the main body or shell has a widened and compressed shape that allows it to occupy the least height-wise possible space with respect to the head of the internal combustion engine, and the conduit for the inlet of exhaust gases and the conduit for the outlet of exhaust gases are placed in fluid communication with a same transverse side wall (46), with respect to the driving direction of the vehicle, of the main body or shell.

A heat exchanger system for treatment of a flow of exhaust gases in an exhaust gas aftertreatment system of a vehicle. The heat exchanger system includes a nitrogen monoxide (NO) oxidation site for oxidising nitrogenmonoxide to nitrogen dioxide (NO2). The NO oxidation site is positioned such that the flow of exhaust gases at a downstream end (40) of the NO oxidation site in use of the heat exchanger system is arranged to proceed at a temperature within a predetermined temperature interval corresponding to a desired NO to NO2(NO:NO2) ratio interval in the flow of exhaust gases. An exhaust gas aftertreatment system and a vehicle including such a heat exchanger system, and a method for using such a heat exchanger system, are also provided.

An exhaust gas muffler of an internal combustion engine, including a muffler housing having an exhaust gas inlet and an exhaust gas outlet and including a first Helmholtz resonator made of a first housing portion that delimits a first Helmholtz volume and includes a first coupling pipe. At least one second Helmholtz resonator is provided made of a second housing portion that delimits a second Helmholtz volume and includes a second coupling pipe via which the second Helmholtz volume can be coupled to an exhaust gas flow A of the exhaust gas inlet. The second coupling pipe is arranged at least partly within the first coupling pipe, and both coupling pipes delimit an annular gap R via which the first Helmholtz volume can be coupled to the exhaust gas flow A.

An aftertreatment module for the treatment of exhaust gasses from a power system includes a first aftertreatment brick and a second aftertreatment brick. The first and second aftertreatment bricks can be flow-through type catalysts for catalyzing byproducts in the exhaust gasses. The aftertreatment module can include a first channel directing the incoming exhaust gasses in a first direction through the first aftertreatment brick and a second channel directing the exhaust gasses through the second aftertreatment brick. The first and second channel can be in a side-by-side arrangement. To communicate the exhaust gasses between the first and second channels, a traverse channel can redirect the gas flow within the aftertreatment module.

Three-way catalytic converters and devices for processing tail gases are disclosed. In some embodiments, a three-way catalytic converter includes a cylindrical housing, a three-way catalytic assembly provided in the cylindrical housing, a tail gas inlet and a tail gas outlet provided at the top of the cylindrical housing and communicated with the cylindrical housing, and a heater circumferentially wrapped around the outer side wall of the cylindrical housing. The three-way catalytic assembly is heated by energizing the heater. In other embodiments, a first cavity is formed between the three-way catalytic assembly and one end of the cylindrical housing, a second cavity is formed between the three-way catalytic assembly and another end of the cylindrical housing, the tail gas inlet is connected with the first cavity, and the tail gas outlet is connected with the second cavity.

An exhaust structure for an engine includes: a catalyst converter configured to purify exhaust gas of the engine; a catalyst pipe in which the catalyst converter is accommodated; and a lead-out pipe configured to lead the exhaust gas to the catalyst pipe. The lead-out pipe is closed at a downstream end thereof, and has a plurality of discharge holes formed in a peripheral wall thereof.

Provided are an aftertreatment device capable of purifying exhaust gas with a compact configuration and an engine including the aftertreatment device. An aftertreatment device includes: a first case that is a DPF case; a second case that is an SCR case; an exhaust connection pipe that connects the first case and the second case; a mixer arranged at an upstream end of the exhaust connection pipe in a flow direction of exhaust gas; and a urea water injection portion that injects urea water into the mixer.

A sound damper for an exhaust gas system of an internal combustion engine includes a sound damper housing, at least one intermediate wall which is arranged in a housing interior and at least one sound damper connection pipe. The sound damper connection pipe is supported in a first pipe end region on the sound damper housing and is arranged in a second pipe end region on a support element which is arranged in the housing interior. The support element forms an integral component of an intermediate wall. The sound damper connection pipe introduces exhaust gas into the housing interior or directs exhaust gas out of the housing interior.

Three-way catalytic converters and devices for processing tail gases are disclosed. In some embodiments, a three-way catalytic converter includes a cylindrical housing, a three-way catalytic assembly provided in the cylindrical housing, a tail gas inlet and a tail gas outlet provided at the top of the cylindrical housing and communicated with the cylindrical housing, and a heater circumferentially wrapped around the outer side wall of the cylindrical housing. The three-way catalytic assembly is heated by energizing the heater. In other embodiments, a first cavity is formed between the three-way catalytic assembly and one end of the cylindrical housing, a second cavity is formed between the three-way catalytic assembly and another end of the cylindrical housing, the tail gas inlet is connected with the first cavity, and the tail gas outlet is connected with the second cavity.