Anthony Nonymous wrote:

A question now more for academic interest than anything: how does the car
estimate separate figures for soot and ash within the DPF if only
differential pressure is recorded?

Ive been thinking about this.

Ash isnt removed by regeneration (as its non-combustible). I would guess
that the system looks at the pressure across the DPF before and after
regeneration. Any residual back-pressure after a regeneration cycle will
be assumed to be ash. The reduction in back-pressure after regeneration
will be soot.

Tim

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