Hitachi ZX 470-6 Workshop Manual page 16

Symbol / Name
Abbreviation
DPF Diesel Particulate Filter
DPD Diesel Particulate Diffuser
DOC Diesel Oxidation Catalyst
CSF Catalyzed Soot Filter
PM Particulate Matter
EGR Exhaust Gas Recirculation
HRV Hose Rupture Valve
LLC Long Life Coolant
SCR Selective Catalytic Reduction
DCU Dosing Control Unit
S/M Supply Module
D/M Dosing Module
NOx Nitrogen Oxide
DEF Diesel Exhaust Fluid
SYMBOL AND ABBREVIATION
Explanation
DPF is a filter which removes particulate matter (PM)
including the toxic substance of exhaust gas of the diesel
engine. Exhaust particulate removal equipment.
DPD is an exhaust emission control system, a type of DPF,
which cleans up particulate matter (PM) of diesel engine
exhaust gas. DPD is a ceramic filter which traps and filters
PM of exhaust gas. DPD burns up accumulated PM when PM
increases and regenerates the filter.
Oxidation catalyst for the diesel engine. Diesel oxidation
catalyst oxidizes unburnt fuel and raises exhaust
temperature.
Filter. The filter traps, burns, and remove particulate matter
(PM) by using high-temperature-exhaust gas with diesel
oxidation catalyst. Catalyst is applied onto the filter. This
advances PM burning.
Particulate matter.
The EGR control re-circulates a part of exhaust gas in the
intake manifold and combines it with intake-air. Therefore,
combustion temperature is lowered and generation of oxide
of nitrogen (NOx) is controlled.
Hose rupture valve.
Long life coolant.
The urea SCR system injects diesel exhaust fluid to nitrogen
oxide (NOx) exhausted from the engine and purifies NOx.
Urea SCR system controller. DCU controls the diesel exhaust
fluid injection amount according to the machine operating
condition.
Diesel exhaust fluid supply module. The diesel exhaust fluid
supply module pumps diesel exhaust fluid to the dosing
module (D/M). Then, it returns diesel exhaust fluid in the
diesel exhaust fluid circuit when the key switch is turned
OFF.
Dosing module. The dosing module (D/M) injects diesel
exhaust fluid into the exhaust piping according to the signal
from DCU.
Nitrogen oxide.
Diesel exhaust fluid. The diesel exhaust fluid concentration is
32.5 %, which is specified in ISO22241.
SY-2