Hybrid Regeneration
Hybrid diesel particulate filters are so-called because they rely on both passive
and active regeneration. Passive regeneration occurs spontaneously whenever conditions
are appropriate (ie the exhaust temperature is above a certain threshold and there
is enough DPM in the filter so that, once lit, it can sustain combustion). If conditions
remain inappropriate for a prolonged period, then active regeneration is automatically
triggered in order to prevent the filter from becoming blocked. A hybrid approach
to regeneration gives the best of both Worlds: passive regeneration (which does
not consume any additional energy) whenever possible, with active regeneration as
the back-up plan. Hybrid regeneration is the standard approach for engines fitted
with common-rail injection, since the engine management system can enrich the mixture
whenever necessary and this additional fuel can be burned to produce the necessary
heat. However, in the retro-fit market most engines do not have common-rail injection.
Blackthorn offers a choice of two hybrid systems which can be used regardless of
the type of fuel injection used.
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