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TECHNIQUE TO PREVENT ACTIVE REGENERATION IN AFTER-TREATMENT SYSTEM OF A LOCOMOTIVE

IP.com Disclosure Number: IPCOM000249655D
Publication Date: 2017-Mar-15
Document File: 2 page(s) / 9K

Publishing Venue

The IP.com Prior Art Database

Abstract

A technique for preventing active regeneration in an after-treatment system of a locomotive is proposed. The proposed technique protects after-treatment systems like diesel particulate filter (DPF) or diesel oxidation catalyst (DOC) for a locomotive by preventing active regeneration. According to the proposed technique, the after-treatment system is bypassed when operating conditions are not conducive for passive regeneration.

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TECHNIQUE TO PREVENT ACTIVE REGENERATION IN AFTER-TREATMENT SYSTEM OF A LOCOMOTIVE

BACKGROUND

 

The present disclosure relates generally to locomotive emissions and more particularly to a technique for preventing active regeneration in after-treatment systems of a locomotive engine.

In locomotives, an after-treatment system like diesel particulate filter (DPF) or diesel oxidation catalyst (DOC) is sensitive to fouling at idle or low load operating conditions. Also, passive regeneration of the DPF does not occur at low load operating conditions due to low exhaust temperatures. Loading the after-treatment system with particulate matter (PM), at low load operation, results in increased fuel usage to burn out soot with an active regeneration event. Further, excess soot loading at low load operating conditions leads to thermal runaway during active regeneration.

It would be desirable to have a technique for preventing active regeneration in locomotives with a diesel particulate filter.

DETAILED DESCRIPTION

A technique for preventing active regeneration in an after-treatment system of a locomotive is proposed.  The proposed technique protects after-treatment systems like diesel particulate filter (DPF) or diesel oxidation catalyst (DOC) for a locomotive by preventing active regeneration.

Conditions like low load, idle operation and exhaust gas temperature falling below specific limit are not favorable for passive regeneration. According to the proposed technique, the after-treat...