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Arrangement for an exhaust line of an internal combustion engine

A technology for exhaust pipelines and internal combustion engines, applied to mechanical equipment, internal combustion piston engines, exhaust gas treatment, etc., can solve problems such as unfavorable energy efficiency, reduced efficiency, SCR unit damage, etc., and achieve a significant effect of total gain

Inactive Publication Date: 2010-11-24
VOLVO LASTVAGNAR AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although the combination of DFP and SCR unit helps to purify the exhaust gas significantly, there are still some problems that cannot be solved
[0009] Because high temperatures are required to burn the accumulated soot, it becomes necessary to include a burner in which the fuel is injected and burned; this is detrimental to the energy efficiency of the vehicle as the fuel is not used for the propulsion of the vehicle and is always increased fuel consumption
[0010] Another disadvantage of current exhaust arrangements is the need for repeated regeneration operations at temperatures of 600°C and above, which can cause damage to the SCR unit and reduce its efficiency

Method used

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  • Arrangement for an exhaust line of an internal combustion engine
  • Arrangement for an exhaust line of an internal combustion engine
  • Arrangement for an exhaust line of an internal combustion engine

Examples

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Embodiment Construction

[0021] figure 1 An internal combustion engine 2 equipped with a turbocharger is shown. The internal combustion engine 2 is a diesel engine that emits exhaust gas; the exhaust gas emitted by the diesel engine contains diesel particulate matter (PM), mainly carbon, which is not combusted during the power stroke.

[0022] As is common on diesel engines, figure 1 The engine is equipped with a turbocharger. The turbocharger may be a variable geometry turbocharger.

[0023] Such as figure 1 As shown, intake air is delivered through intake line 3 for supply to engine 2 . The intake line 3 can suitably include a compressor 4 . An intake air cooler 5 is provided in the intake line 3 to reduce the temperature of the intake air before it enters the engine 2 .

[0024] Exhaust gases formed in the internal combustion engine 2 are collected by the exhaust manifold 7 and then conveyed towards the atmosphere via an exhaust line 8 .

[0025] The exhaust line 8 can suitably comprise a tu...

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PUM

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Abstract

The invention concerns an arrangement for an exhaust line of an internal combustion engine comprising a fuel burner (15) located upstream of a diesel particulate filter, and a selective catalytic conversion unit. The arrangement, further, comprises a turbine (16) connected to an energy recovering means interposed on the engine exhaust line between the diesel particulate filter and the SCR unit. Firstly, the invention makes it possible to convert into useful work the thermal energy liberated by the filter regeneration which, in a conventional exhaust line is wasted, Secondly, the turbine has the further effect of lowering the temperature entering the SCR unit which, in a conventional exhaust line, is fed with high temperature exhaust gas that has a detrimental effect on the life span of the SCR unit.

Description

technical field [0001] The invention relates to an arrangement for an exhaust line of an internal combustion engine. Background technique [0002] Environmental legislation requires any vehicle powered by an internal combustion engine (including diesel engines) to treat the exhaust to reduce the toxic levels of the emissions. [0003] Exhaust gas produced by diesel engines includes gases such as hydrocarbons, carbon monoxide, and nitrogen oxides, as well as soot, which is said to be unburned particulate matter (PM) of diesel fuel. [0004] To this end, vehicles are equipped with purification devices such as a selective catalytic reduction (SCR) unit and a diesel particulate filter (DPF) for diesel engines. [0005] SCR units are exhaust gas cleaning devices that can be positioned on the exhaust line and help convert nitrogen oxides into water and nitrogen (N 2 ). The SCR unit includes a catalytic converter in which in the presence of a catalyst (NH 3 ) in the case of nit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/02F01N5/04F02B37/013F01N3/20
CPCF02B37/013Y02T10/24F01N5/04F01N3/2066Y02T10/144F01N2240/14F02B37/004Y02T10/16F01N3/025Y02T10/12
Inventor 马克·勒琼
Owner VOLVO LASTVAGNAR AB