Comments on: Diesel Particulate Filters http://www.ret-monitor.com/articles/996/diesel-particulate-filters/ Specific mission-critical info for professionals Mon, 21 May 2012 23:18:00 +0000 http://wordpress.org/?v=2.7.1 hourly 1 By: Paul Cole http://www.ret-monitor.com/articles/996/diesel-particulate-filters/comment-page-1/#comment-3535 Paul Cole Mon, 14 Jun 2010 21:40:06 +0000 http://www.ret-monitor.com/articles/996/diesel-particulate-filters/#comment-3535 A reasonable article...but you clearly don't work in the automotive industry! In road vehicles, the ECU instigates a controlled regeneration cycle to increase the exhaust gas temperature and burn off the deposited soot. In early applications, the "Drive harder" lights were much more common than they are now - modern control strategies and better DPFs (catalysed DPFs are now common, reducing the temperature at which the soot burns off) mean less clogging. It is true to say that on light duty cycles the fuel economy penalty of regenerating the DPF will be worse, but for most users (eg - those racking up lots of motorway miles) you would be hard pressed to see a difference. Of course, regenerations are not something that race cars have to worry about, as at full load the exhaust temperature will be more than high enough to passively regenerate the filter, in fact I would not be at all surprised if they have the opposite problem - ie: the gas temperature is too high for the filter substrate... A reasonable article…but you clearly don’t work in the automotive industry! In road vehicles, the ECU instigates a controlled regeneration cycle to increase the exhaust gas temperature and burn off the deposited soot. In early applications, the “Drive harder” lights were much more common than they are now - modern control strategies and better DPFs (catalysed DPFs are now common, reducing the temperature at which the soot burns off) mean less clogging. It is true to say that on light duty cycles the fuel economy penalty of regenerating the DPF will be worse, but for most users (eg - those racking up lots of motorway miles) you would be hard pressed to see a difference.

Of course, regenerations are not something that race cars have to worry about, as at full load the exhaust temperature will be more than high enough to passively regenerate the filter, in fact I would not be at all surprised if they have the opposite problem - ie: the gas temperature is too high for the filter substrate…

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