3. Electric System
3-3
3.1.3
Diesel particulate filter (DPF)
The DPF consists of the diesel oxidation catalyst (DOC) and the SF, held by a case that sends the
exhaust gas to the DOV and the SF.
The role of the DPF is to prevent the discharge of PM by breaking down the hazardous constituents
with the DOC and collecting the PM with the SF. The PM clogs the SF if left there and the engine
performance decreases, so a means of regeneration is required. This engines use a continuous
regeneration method. While continuing the operation, the DPF collects the PM and is regenerated at
the same time. To perform the regeneration, the PM collected in the SF is combusted with NO
2
generated in the DOC and O
2
in the exhaust gas. At the same time, the DOC purifies the exhaust gas
elements such as HC and CO into H
2
O and CO
2
.
Apart from the PM, ash also collects in the SF. This comes mostly from metallic components in the
additives to the lubricating oil. Part of the lubricating oil is burnt in the high temperature
combustion chamber and exhausted along with the combustion gas. In that case, metallic
components are collected together with the PM in the SF. However, because the amount of ash is
very little compared to the PM, it does not clog the SF immediately. Because ash is a metallic
component, it cannot be combusted in the DPF for treatment like the PM. Therefore, ash is
over-accumulated in the SF over a long period of time. This increases the pressure loss and has
adverse effects on the engine. In this case, maintenance must be performed to remove the SF with
the accumulated ash from the DPF.
SF recommends removal maintenance at every 3,000 hours
operation and DOC recommends replacement at every 9,000 hours operation.
PC14014E
Discount-Equipment.com
Summary of Contents for PDS185S-6E1
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