10-04-2016, 09:47 AM
(10-04-2016, 08:28 AM)tuttyboy84 Wrote: Will the fact i do so many miles mean it will passive regen regardless?
Passive regens are not what you think, the ECU is constantly monitoring differential pressure... The ecu does initiate a regeneration even a 'passive' regeneration, it has to adjust timing and EGR rate to force it to happen... The whole 'take it for a rag' thing is only to help the engine to get up to temperature so that the regeneration will actually happen.
The engines are way too efficient out of it's various regeneration modes to get the DPF hot enough... The obvious 'forced' regeneration when engine speeds are low are what we think of when we mean regeneration, however they're quite rare as usually it's done at higher speeds when it's easier to get the temperature up.
EGR plays a huge role in controlling what happens during regeneration, it also prevents DPF overheating due to excessive oxygen being passed through the filter, you're actually in danger of a thermal runaway without EGR and destroying the DPF filter and catalyst.
