PREVOST X3-45 COMMUTER 2018, Руководство оператора

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OTHER FEATURES 5-3
PA1633 X3-45 Commuter Operator’s Manual
EXHAUST AFTERTREATMENT SYSTEM
The exhaust aftertreatment system consists of
two units, the filtration/regeneration unit and the
selective catalytic reduction SCR unit.
FILTRATION AND REGENERATION UNIT
The aftertreatment system primary function is to
capture and oxidize (regenerate) the particulate
matter (soot) in the engine exhaust gases and to
reduce NOx. To achieve this goal, the exhaust
aftertreatment system is split into two main
sections: the exhaust gases first enter the
Diesel Oxidation Catalyst (DOC) and Diesel
Particulate Filter (DPF) assembly to capture
and regenerate the soot on a regular or passive
basis, then the exhaust gases flow through the
catalytic converter to reduce NOx to minimum
level. Through constant monitoring of the
exhaust gas temperature and the system back
pressure, EMS is able to manage regeneration.
Passive regeneration
Passive regeneration is the process by which
the particulate matter is oxidized due to the heat
generated by the engine internal combustion
process. During normal highway operation,
exhaust temperatures alone are usually high
enough to oxidize accumulating soot. In low
ambient temperatures, however, or in some
stop-and-go applications, the system needs a
little help to regenerate, or clean itself, a
stationary regeneration is then required.
Stationary (parked) regeneration
In a small number of specific engine duty cycles,
engine control module may not be capable of
completing a passive regeneration. In these
situations, the operator will be notified that a
parked regeneration may be required. A DPF
telltale light will illuminate indicating the need for
user interaction. The lamp gives the operator a
grace period to allow this process to take place
at a time when most convenient for the operator.
This process requires the vehicle to be parked
while a driver or maintenance technician initiates
the regeneration process using the DID menus.
Once initiated, the stationary regeneration
process will be complete in about 45 minutes.
The driver will be notified of the need for a
stationary regeneration (parked) by illumination
of the DPF REGENERATION telltale light.