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Old 02-13-2012, 05:38 AM
TDIwyse TDIwyse is offline
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Location: Midwest
 
Join Date: Sep 2010
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Mein Auto: 4 diesels
Caught another DPF regen event on the morning commute. It initiated as soon as engine coolant hit ~140F and lasted the whole trip. Think it was finished based on the EGR behavior at the very end of the trip, but I'll re-check on the way home to see if it has to "finish" anything else.

Environmental conditions were similar to the plots above for the coolant/mpg plots so it's obvious the negative impact the regen event has on the overall fuel economy during its operation. The cold temps seem to require more post injection than during summer months based on my observations of the instantaneous mpg gauges behavior. I'm including plots of the logged instant mpg's that show the radical dips when post injection occurs.

EGR and throttle behavior change dramatically during regen. Engine management seems to want full oxygen for the burning in the DPF.
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