Quote:
Originally Posted by JSH
A lot has changed since the first generation DPFs that came out more than a decade ago.
You are also talking about an forced regen where the DPF is so clogged that the vehicle forces a regen even though the conditions are not ideal. In normal use the vehicle will regen on the highway when the EGT is high and little additional fuel in needed.
A lot of the issues with early DPFs were due to usage. The worse thing you can do with a DPF diesel is idle. However the old school guys never want to turn off their trucks and idle them all the time. In the Class 8 space a lot of problems were caused by drivers idling the engine for hours in "hotel mode" when driver slept. Today trucks use a small diesel APU (Auxiliary Power Unit) that provides heat and power while the main diesel engine is turned off. It fixes the PM issue and is much more fuel efficient than idling a 13-15 liter diesel engine to run the alternator.
However my post was a response to your claim that DPFs were just an illusion - they aren't. They significantly reduce the amount of PM. They don't just make the particles too small to see as you claimed.
|
Where I worked about five years ago there were several distribution center buildings within a few miles of each other. They used new model year (rental) Freightliner tractors to move trailers between DCs. The trucks were idled to run the A/C during the significant downtime. They had to regen often, probably due to both usages.