User Manual

Chapter 13
BOSCH HDI EDC 15C2 INJECTION SYSTEM AND PARTICLE FILTER
117
C - LEVEL 1 REGENERATION ASSISTANCE
When the monitoring function detects a change in operating zone, it requests
activation of level 1 regeneration assistance (e.g. changing from zone "c" to "d").
Every time activation is requested, the injection ECU performs the following
operations:
• it prevents exhaust gas recycling (EGR),
• it requests activation of electrical consumers (heated rear screen, fan unit,
preheater plugs) (*),
• it controls the opening and closing of the inlet air heater throttle (if necessary),
• it activates post-injection (heating of the exhaust gases).
(*) this request is subject to the electrical load shedding strategy of the BSI
(depending on equipment).
D - LEVEL 2 REGENERATION ASSISTANCE
The principle is the same as level 1 regeneration assistance but stricter
cartographic maps lead to a higher exhaust gas temperature.
The switch from level 1 to level 2 regeneration assistance depends on the
following conditions:
• upstream and downstream exhaust temperature,
• for as long as the temperature has not reached a limit.
It is impossible to switch from level 1 to level 2 regeneration assistance if level 1
has not been active for a given time.
E - CASE OF REQUESTING REGENERATION ASSISTANCE IN ECONOMIC
CONDITIONS (BY THE MONITORING FUNCTION)
The aim of this request is to activate regeneration assistance under optimum
driving conditions, in order to reduce fuel consumption.
The principle is the same as levels 1 and 2 regeneration assistance but with a
shorter post-injection time.
Parameters required:
• particle filter in zone "c", "e" or "f",
• sufficient vehicle speed or engine speed/load for a given time
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