User Manual

Chapter 13
BOSCH HDI EDC 15C2 INJECTION SYSTEM AND PARTICLE FILTER
109
OPERATING PHASES:
PARTICLE FILTRATION
I - GENERAL PRINCIPLE
The aim of filtration is to remove the particles retained on the filter walls.
Regeneration consists of periodically burning off the particles accumulated in the
particle filter.
Regeneration can be natural if the temperature of the exhaust gases is sufficient.
Regeneration can be caused by the injection ECU if the temperature of the exhaust
gases is insufficient and if the particle filter is clogged.
The injection ECU artificially increases the temperature of the exhaust gases using
post-injection: this is the "regeneration assistance" phase.
Note: The driving conditions directly affect the temperature of the exhaust gases
and consequently the temperature inside the particle filter.
The injection ECU permanently controls the following components:
• the status of the filter using a function which monitors the load level of the particle
filter,
• regeneration assistance using a regeneration assistance function.
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