User Manual

Chapter 13
BOSCH HDI EDC 15C2 INJECTION SYSTEM AND PARTICLE FILTER
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V - EFFECTS OF ACTIVATING REGENERATION ASSISTANCE
A - PROHIBITION OF EXHAUST GAS RECYCLING REGULATION (EGR)
Every time regeneration assistance is activated, the injection ECU prohibits
exhaust gas recycling regulation:
• exhaust gas recycling valve closed (prevents any hunting phenomena),
• throttle housing open (except if closing is requested to force air to flow into the
heater).
B - ACTIVATION OF ELECTRICAL CONSUMERS
1 - Role
Reason for activating electrical consumers:
• to increase the resistant torque of the alternator, thus leading to an
increase in engine load,
• to facilitate the rise in temperature of the exhaust gases,
• to quickly place the engine operating point within conditions allowing
effective post-injection.
2 - Operation
The injection ECU asks the BSI to activate consumers which absorb a high
power (alternator saturation request) (*).
(*) depending on vehicle equipment.
Order in which consumers are activated by the BSI (**):
• heated rear screen control,
• request to force the fan unit at low speed,
• control of the fan unit at mid speed,
• request to force the pre-post heating plugs.
(**) allowed by the load shedding level of the vehicle (provided that the
battery voltage is above 12.8 volts).
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