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SCR treatement of engine exhaust gases using temperature control

A technology of exhaust gas treatment and internal combustion engine, applied in the direction of exhaust gas treatment, electronic control of exhaust gas treatment device, diagnostic device of exhaust gas treatment device, etc.

Inactive Publication Date: 2014-11-26
JAGUAR LAND ROVER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This inhibition avoids the formation of solid deposits in the chamber and the waste of urea, but unavoidable prolonged city driving may eventually lead to complete depletion of the catalyst

Method used

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  • SCR treatement of engine exhaust gases using temperature control
  • SCR treatement of engine exhaust gases using temperature control

Examples

Experimental program
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Embodiment Construction

[0023] refer to figure 1 A diesel internal combustion engine 11 has an exhaust tract or system 12 comprising a diesel oxidation catalyst (DOC) 13 , a diesel particulate filter (DPF) 14 and a catalyst 15 for selective catalytic reduction. The exhaust duct ends with an open tailpipe 16 .

[0024] An engine management system (EMS) 17 electronically controls the operation of the engine, particularly the fueling of the engine, based on programmed information, real-time monitoring, and driver demand. Such engine management systems are well known and need not be further described here.

[0025] A container 18 of liquid urea is provided for periodic dosing of the exhaust tract as indicated by arrow 19 under the control of the EMS 17; as described above, the urea mixes with the exhaust gas to produce ammonia, which supplements the SCR catalyzed by the ammonia device. The mixing takes place in the region of the exhaust tract where urea is supplied, referred to herein as the make-up r...

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PUM

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Abstract

The exhaust system 12 of an internal combustion engine 11 is periodically dosed with urea 19 or ammonia to recharge a selective catalytic reduction (SCR) catalyst 15. If dosing is scheduled the temperature of the SCR catalyst 15 or the exhaust temperature upstream of it is determined and compared to a threshold and if the exhaust gas temperature is too low to ensure recharging, a forced increase in exhaust gas temperature is effected for the period of the dosing and thereafter reverts to standard. The exhaust gas temperature is raised by a post-combustion fuel injection, modification of the combustion conditions within the engine, or electric heating. A diagnostic to confirm correct operation of a catalytic converter may advantageously run at the same time.

Description

technical field [0001] The present invention relates to the treatment of exhaust emissions from internal combustion engines, and in particular to engine exhaust systems incorporating selective catalytic reduction. Aspects of the invention relate to a method, an engine and a vehicle. Background technique [0002] Legislation requires the treatment of harmful emissions from internal combustion engines. Selective Catalytic Reduction (SCR) uses ammonia as a reducing agent to convert nitrogen oxides (NOx) to nitrogen and water. Urea is typically injected periodically into the engine exhaust system upstream of the SCR chamber, where it mixes with the hot exhaust to produce ammonia. This ammonia is absorbed onto the SCR catalyst in the chamber and effectively treats NOx. Over time, the ammonia is consumed, so further injections of urea are required to replenish the catalyst. Ammonia consumption is typically estimated in an engine management system by monitoring engine activity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/94F01N3/20B01D53/90
CPCF01N3/208F02D41/0235F01N11/002F01N3/2013F01N2550/02F01N2900/1602F02D41/405F01N2610/02Y02T10/24B01D2251/2067B01D53/9409B01D53/90F02D41/0245B01D53/9495F02D41/1446Y02A50/20Y02T10/12Y02T10/40F01N3/20F01N3/206F01N3/2066F01N9/00F01N3/0885
Inventor 内尔·贝万罗伯特·本丁迈克尔·戴维斯阿兰·琼斯
Owner JAGUAR LAND ROVER LTD
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