EAAM057608EN
GC250 Technical Manual 69
o
Indicates that the engine emissions system has a malfunction or is
working outside the standard operating conditions. I can be fixed or flashing.
Note:
The controller forces the display of this page every time an icon is activated.
•
Commands. The specification provides two separate commands, to be sent to the
ECU, to influence the regeneration of the DPF:
o
Inhibition of regeneration. This command should only be activated when the
full power of the generator is required. Regeneration, in fact, involves
temperature increases that may require a derating of engine performance. It
should be a transient condition: if the level of soot in the filter increases and
the ECU cannot regenerate it, at some point the ECU will still apply a derating
and eventually it could stop the engine.
o
Forcing of regeneration. It is the opposite command: verifying from the
previous lamps the request for regeneration from the ECU, the operator can
force it in the moments more favorable to him.
The controller implements these commands in two ways:
o
Parameter P.0446. This parameter can take three values:
▪
0 - Automatic. It does not send any commands to the ECU, which is
therefore free to perform the regeneration whenever it wants.
▪
1
– Forced. It sends the forcing command to the ECU for a maximum
of 10 seconds (then the parameter is reset to 0-Automatic). If the ECU
can, it carries out a regeneration cycle, which involves overheating
the emission treatment system and derating the engine. Following
this command, some of the lamps described above can be activated.
▪
2
– Inhibited. It activates the ECU inhibition command, which
therefore does not regenerate, even if required.
The parameter can be modified directly from page E.15.
o
As an alternative to the parameter, it is possible to use two digital inputs
configured with the following functions:
▪
DIF.2071: inhibits regeneration.
▪
DIF.2072: forces regeneration.
If there is one of the inputs, parameter P.0446 can no longer be changed,
because the inputs go to force the value of the parameter.
You can also use virtual digital inputs to build complicated logics to manage
the regeneration of the filter.
As a rule, the controller uses the Can bus line to send these commands to the ECU.
It is also possible to use digital outputs, configured with the following functions:
o
DOF.1035: regeneration inhibited.
o
DOF.1036: regeneration forced.
The status of the two commands (forcing and inhibiting) is available for the AND/OR
logics through the ST.137 and ST.138 states.
Some ECUs, to perform the "active" regeneration of the particulate filter, must
necessarily increase the engine speed. For this reason, they require consent from the
controller before activating this process. The controller sends the consent to the
"active" regeneration if the GCB circuit breaker is open.
