User Manual

Chapter 13
BOSCH HDI EDC 15C2 INJECTION SYSTEM AND PARTICLE FILTER
116
IV - REGENERATION ASSISTANCE MANAGEMENT FUNCTION
A - ROLE
• To control requests from the monitoring function.
• To activate the functions required for regeneration, depending on the
monitoring states.
• To determine the required regeneration assistance level.
• To control the effects of post-injection on engine operation.
Regeneration consists of periodically burning off the particles accumulated on the
filter enabling it to remain in zone "b" or "c".
Filter regeneration depends on the temperature of the exhaust gases which must
be above the soot combustion limit.
There are 2 techniques for achieving this:
• natural regeneration,
• artificial regeneration (regeneration assistance).
Natural regeneration.
When the exhaust temperature reaches the regeneration limit itself (high engine
load), the particles burn off naturally in the particle filter. No external actions are
required to assist regeneration.
Artificial regeneration (regeneration assistance).
Regeneration assistance is a set of provisions controlled by the injection ECU,
the aim of which is to increase the temperature of the exhaust gases to the
regeneration limit.
B - WORKING OUT THE REQUIRED REGENERATION ASSISTANCE LEVEL
There are 2 types of regeneration assistance, depending on the thermal state of
the exhaust pipe:
• level 1 regeneration assistance (cartographic maps for cold exhaust pipe and
catalytic converter) (catalytic converter pre-heating),
• level 2 regeneration assistance (cartographic maps for warm exhaust pipe).
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