DL06K Interim Tire-4 Diesel Engine Disassembly and Reassembly of Major Components
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3.6.4. Diesel particulate filter : DPF
z Introduction
DPF (Diesel Particulate Filter) prevents PM (Particulate Matter) from
contaminating the air when exhausted without proper treatment. DPF consists of
DPF itself, 3 units of exhaust gas temperature sensor and differential pressure
sensor. DPF has a structure that is similar to honeycomb. When exhaust gas
reaches the DPF, PM piles up inside DPF while the rest goes through the DPF.
The PM piled inside DPF is defined as Soot, and the PM will be burned again or
eliminated by one of the two generation method.
z DPF regeneration
DPF regeneration is a process of
eliminating soot, the contaminant in
the exhaust gas generated after fuel
burning that is filtered and piled inside
DPF. ECU (Engine Control Unit)
calculates the amount of soot by
analyzing the data collected from DPF
Differential Pres signal, vehicle
operating hours, fuel consumption and simulation data and starts DPF
regeneration when the amount of soot reaches certain level. Regeneration is a
process of burning collected soot in DPF by raising temperature above 580 °C in
DOC as controlling engine throttle and post fuel injection and spraying HC
(diesel) through exhaust. After the regeneration process, ash remains inside DPF.
DPF Regeneration has 2 different modes
; active and forced regeneration
.
EJ9OM060
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