Fluid cooled injector and exhaust aftertreatment system, vehicle, and method using a fluid cooled injector

Abstract

A fluid cooled injector includes an injector body comprising an injector tip and a cooling channel, the injector tip comprising an injector orifice, and a heat conducting shield, the heat conducting shield comprising a heat conducting shield orifice arranged coaxially with the injector orifice, the heat conducting shield being in direct contact with at least one of the injector body and the injector tip. An exhaust after treatment system and a vehicle including such an injector, and a method involving the use of such an injector, are also disclosed.

Description

BACKGROUND AND SUMMARY[0001]The present invention relates generally to fluid cooled injectors and, more particularly, to such injectors including heat shields to facilitate heat transfer from the injector tip.[0002]In exhaust aftertreatment systems for diesel engines, it is typical to use a so-called seventh injector to inject fuel into an exhaust stream to raise the temperature of the exhaust stream, usually for purposes of regenerating a diesel particulate filter in the exhaust aftertreatment system, although there are other circumstances when the seventh injector is used to raise the temperature of the exhaust gas. In diesel engines used in over-the-road trucks, these injectors tend to clog every 20-40000 miles. Clogging of these injectors is problematic and in the past, clogging has typically been addressed by conducting an air purge, which wastes time and fuel.[0003]The inventors have discovered what they understand to be the mechanism behind the clogging problem and have devis...

AI Technical Summary

Benefits of technology

The patent text is discussing the issue of clogging in the seventh injector. The goal is to find a solution that doesn't require more fuel, is cost-effective, and can be added to existing vehicles.

Problems solved by technology

In diesel engines used in over-the-road trucks, these injectors tend to clog every 20-40000 miles.

Clogging of these injectors is problematic and in the past, clogging has typically been addressed by conducting an air purge, which wastes time and fuel.

They believe that this explains why clogging tends to occur for some vehicles, but not for others, because the temperature at the seventh injector tip varies.

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