Exhaust aftertreatment device for internal combustion engine and vehicle with same

Abstract

An exhaust gas aftertreatment device for an internal combustion engine (ICE) comprising a housing, a first and a second catalytic substrate and a reductant injector. Said first and second substrates are arranged inside said housing such that said first catalytic substrate is arranged upstream of said second catalytic substrate. Said reductant injector is arranged in between said first and said second catalytic substrate. Further, said first and second catalytic substrates are arranged such that a fluid flow direction through said exhaust gas aftertreatment device is angled. A flow redirecting wall is arranged downstream of said first catalytic substrate such that said fluid flow between said first catalytic substrate and said second catalytic substrate at least partially passes an outer circumference of said first catalytic substrate before reaching said second catalytic substrate. Said redirecting wall is inclined to an outlet surface of said first catalytic substrate and said reductant injector is arranged at said redirecting wall at a position distant from said outlet surface.

Description

technical field [0001] The invention relates to an exhaust aftertreatment device for an internal combustion engine. The invention can be used in passenger cars as well as heavy vehicles such as trucks and buses. Background technique [0002] In order to comply with the current stringent emissions laws, almost all vehicles with internal combustion engines have an exhaust aftertreatment device comprising at least one catalytic converter substrate. Catalytic substrates typically include a channeled structure through which exhaust gases can pass while being exposed to a large surface area of ​​the catalytic substrate. The channels of the catalytic substrate may be fluidly connected by vias or similar structures to allow the passage of gas between adjacent channels. This enables gas to diffuse through the catalytic substrate structure. For gasoline engines, the most frequently used catalytic substrates are of the three-way catalyst (TWC) type, while for most diesel engines, th...

AI Technical Summary

Problems solved by technology

The device disclosed in US Patent 2008 / 0041036A1 has many advantages but only one catalytic substrate is provided

In addition, US Patent 2008 / 0041036A1 does not provide sufficient mixing of reactants and exhaust gases

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