McConnel ROBOCUT2 RC40 - 6.5 Exhaust Gas Post Treatment System; 6.5.1 DPF Overview (Particulate Filter)

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McCONNEL
6.5 - EXHAUST GAS POST TREATMENT SYSTEM
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Differential pressure sensor
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Exhaust gas outlet
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Installation material
4
Exhaust gas inlet
5
Muffler
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SF filter container
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SF filter
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DOC container
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DOC
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Exhaust gas temperature sensors
6.5.1 - DPF OVERVIEW (PARTICULATE FILTER)
The DPF consists of a Diesel Oxidation Catalyst (DOC) and an SF (Soot Filter). The purpose of the
DPF is to prevent particulates, which are harmful to both man and the environment, from being
released into the air. This is achieved by the DOC that breaks down the dangerous molecules and
the SF that collects the particulates. If the level of particulates that have accumulated in the SF is
high, it will clog and reduce the performance of the engine. A means to regenerate the SF is
therefore required. The engines used by McConnel use a continuous regeneration method i.e. they
regenerate the filter at the same time as they collect the
particulates. In order to increase the regeneration performance, the particulates collected in the SF
are burnt with the NO
2
generated in the DOC and with the O
2
in the exhaust gases. At the same
time, the DOC purifies the exhaust gases by converting, for example, acetylene (HC) and carbon
monoxide (CO) into water (H
2
O) and carbon dioxide (CO
2
) respectively.
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