PEC017
5/3/2018
Page
87
of
105
21.0
Automatic HC Desorb
Overview
Automatic HC Desorb (
) functionality provides the truck with the ability to
perform an HC Desorb (hydrocarbon desorption) automatically during extended
idling. This feature is fully integrated into the aftertreatment system and will perform
an HC Desorb when the truck is idling, conditions are met, and without any driver
inputs, potentially eliminating the need for a Manual HC Desorb.
Prior to Auto HC Desorb functionality, customers had to perform a Manual HC
Desorb before driving after idling for an extended amount of time.
Auto HC Desorb functions by periodically increasing engine speed and exhaust
temperatures to maintain a low level of HC accumulation in the aftertreatment during
extended idle. This operation will maintain a level of accumulated hydrocarbons so
that the truck is always safe to be driven and there is minimal risk of aftertreatment
damage. Drivers may experience unexpected changes in engine speed when Auto
Desorbs occur, sometimes without notification depending on NAMUX version. When
the Auto Desorb has completed, engine speed will return to the previous set speed.
Standard Feature
With Auto HC Desorb
Enabling Auto HC Desorb allows the truck to perform a hydrocarbon desorption
automatically during extended idling. This reduces the likelihood of the driver having
to perform a Manual HC Desorb after extended idling.
Feature Options
Without Auto HC Desorb
Disabling Auto HC Desorb may cause the driver to perform a Manual HC Desorb
before driving, after idling for an extended period.
Programmable Parameters
N318
Page
Min
Default
Max
Units
Enables the Auto HC Desorb
functionality
0 (OFF)
0 (OFF)
1 (ON)
ON/OFF
ON/OFF Requirements
ON
OFF
Auto HC Desorb ON
Auto HC Desorb OFF
