UD Trucks QUESTER Series, Руководство пользователя

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1.INTRODUCTION AND SAFETY
1-27
1.15 OBD (On board diagnostics)
General
UD Trucks uses SCR technology
( S e l e c t i v e C a t a l y t i c R e d u c t i o n )
catalytic emission control to fulfil the
requirements of the Euro IV/China IV
or any other equivalent standards.
T h e r e i s a l e g a l r e q u i r e m e n t i n
monitoring the emission standards.
The regulation means that in addition
to existing OBD-system there must
a l s o b e a s p e c i a l l e v e l a n d
diagnostic system for the engine's
exhaust after treatment systems, so-
called NOx regulatory monitoring
(NOx = nitrous oxides).
NOx control monitoring system is to
monitor:
•
The level of NOx in the exhaust.
• The level of AdBlue in the tank.
• Faults in the emission control
monitoring system.
The following effects will occur if
faults are detected in the exhaust
gas after treatment
• The monitoring system will inform
the user through warning lamps
and fault messages.
• “Non-erasable fault codes” are
set.
• Possible derating of the engine
(depending on type of fault)
• The information is also provided
in the form of telltale indicators,
p o p u p m e s s a g e w h e n t h e
AdBlue level is low. Also the user
can view the current AdBlue level
from the display.
Conditions
The NOx control monitoring system
i s a c t i v e u n d e r t h e f o l l o w i n g
conditions only
•
Ambient temperature is between
-7° C to + 40° C.
• The altitude above sea level is
less than 1600 m.
• Coolant temperature is above
70° C.
In order for a “non-erasable fault
code” to be set (activated), a number
of different basic conditions must be
f u l f i l l e d . T h e c o n d i t i o n s v a r y
d e p e n d i n g u p o n w h i c h f a u l t i s
displayed. There are three different
faults that generate a “non-erasable
fault code”:
1.
Empty AdBlue tank.
2. NOx level exceeding the certified
level.
3. The NOx level cannot be moni-
tored.