Alfa Romeo 159 Training Material page 154

ENGINE
The DPF system consists of:
DPF
sensor and actuators
specific engine ECU strategies.
The trap is an accumulation system that must be regularly regenerated (cleaned) by burning the particles of
particulate in the filter whose quantity is calculated by the ECU by applying an algorithm. The ECU uses multiple
injection to increase the exhaust gas temperature to ~600°C and burn the particulate.
The DPF abates emissions of particulate to 90% during NEDC test cycle (from 0.025 g/km to 0.001 g/km in
compliance with Euro 4 limits).
The trap is an accumulation system that must be regularly regenerated (cleaned) by burning the particulate in the
filter. There are essentially two regeneration technologies:
With additive
The additive technology is patented by PSA under the name FAP ('Filtre A Particules').
The additive is a catalyser liquid which is used to burn the particulate in the trap at lower temperatures ~500°C.
Advantages
Lower regeneration temperature
Shorter regeneration time
Disadvantages
More complex architecture
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