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Apparatus and method of operating an injector for an exhaust gas aftertreatment apparatus

an exhaust gas aftertreatment and injector technology, which is applied in the direction of mechanical equipment, engines, machines/engines, etc., can solve the problems of high temperature, inability to operate the device consistently, and inability to meet the needs of exhaust gas aftertreatment,

Inactive Publication Date: 2015-07-09
MACK TRUCKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention proposes a device and technique to solve these issues.

Problems solved by technology

At engine start up, aftertreatment components may be at or near ambient temperature, which is typically too low for operation of those devices.
In addition, automotive exhaust, and diesel engine exhaust in particular, is not consistently at temperatures high enough for operation of certain exhaust aftertreatment systems on the vehicle, in particular, regeneration of DPFs.
A problem with hydrocarbon injectors is fouling of the injector nozzle from decomposed liquid hydrocarbon, particulate matter, and other residue collecting on the nozzle, called “coking”.

Method used

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  • Apparatus and method of operating an injector for an exhaust gas aftertreatment apparatus
  • Apparatus and method of operating an injector for an exhaust gas aftertreatment apparatus
  • Apparatus and method of operating an injector for an exhaust gas aftertreatment apparatus

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Embodiment Construction

[0016]FIG. 1 illustrates an apparatus including an internal combustion engine 10 with an exhaust gas aftertreatment system 12 according to the invention. The engine 10 is connected to an exhaust gas conduit 14 that receives exhaust gas from the engine. Exhaust gas is carried by the conduit to an aftertreatment system 16, which may include a Diesel Oxidation Catalyst (DOC), a Diesel Particulate Filter (DPF), and a device for treating Nitrogen Oxides, such as a selective catalytic reaction device (SCR) or Lean NOx Catalyst (LNC). After the exhaust gas is treated, it is released to the environment through an exhaust stack or pipe 18.

[0017]The DPF filters the exhaust gas and collects soot and other particulate matter, which must be removed at intervals or the DPF becomes clogged. One common method for removing particulate matter, which is mainly carbon based, is to raise the temperature of the DPF filter body to a temperature sufficient to oxidize the particulate matter. The temperature...

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Abstract

A method for operating an exhaust aftertreatment system injector to prevent coking includes steps of injecting fuel for heating the aftertreatment devices, when not injecting fuel, flowing air to purge and cool the nozzle to prevent carbon deposits when exhaust gas temperature is low, and substantially stop air flow to allow passive heating of the nozzle by the exhaust for oxidation of any accumulated carbon when exhaust temperature is high enough to support oxidation. Preferably, the nozzle has a catalytic material coating to reduce the temperature necessary for oxidation of the coking material.

Description

FIELD OF THE INVENTION[0001]The invention is directed to exhaust gas aftertreatment apparatuses for internal combustion engines and methods for their operation. More particularly, the invention is directed to an apparatus and method for preventing coke fouling of an aftertreatment injector nozzle of an aftertreatment system.BACKGROUND AND SUMMARY OF THE INVENTION[0002]Exhaust gas aftertreatment apparatuses in automotive vehicles are used to convert or remove targeted substances from the exhaust gas. Aftertreatment devices include, for example, diesel oxidation catalysts (DOC), which can remove particulate matter and oxidize carbon monoxide and uncombusted hydrocarbons in the exhaust gas, diesel particulate filters (DPF), which remove particulate matter from the exhaust gas, and selective catalytic reduction (SCR) systems, that inject an ammonia-based reductant in the presence of a catalyst to convert oxides of nitrogen (NOx) to nitrogen gas and water. Certain aftertreatment devices ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01N3/20F01N11/00
CPCF01N11/002F01N3/2033F01N3/206F01N2610/03F01N2610/08F01N2610/146F01N2900/1404F01N9/00F01N2610/1493Y02T10/40
Inventor MEIER, PHILIPJACQUES, WALTERDONG, QUNLONG
Owner MACK TRUCKS
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