Posted by Mark Robke on August 24, 2015 at 11:46:53 from (67.140.177.88):
In Reply to: JD Tier 4 Engines posted by Spudm on August 24, 2015 at 10:52:34:
I worked on trucks with this system,and it is the exhaust that gets heated by extra fuel being added to the exhaust stream so that it collects on the catylist face in the particulate filter,where it burns off the soot collected on the face,turning it to ash,and collected in another compartment of the particulate filter.This ash must be removed every so often.Depending on how the engine is run determines how much ash is collected.Low speed/light load causes more soot/more frequent need for regens.On trucks there is a hot exhaust light that comes on when the system is doing an automatic regen.Sometimes another light comes on telling you to do a manual regen.On a truck this requires you to pull over in a safe location,set the brakes,and do a manual regen which requires 35- 45 minutes.If you have to do frequent manual regens,the automatic system is not working properly,and needs to be checked by a shop with diagnostic equipment.You cannot ignore the regen needed light because the ECM will derate the engine;keep ignoring it and shut down!!On trucks,our greatest problem was with light load/stop and go operations.Oh,and,IF the exhaust gets too hot it will shut down too!As you might expect this leads to more sensors,wiring, and tons of fault codes.And with the next system where urea(diesel exhaust fluid)is injected into the exhaust stream there is another muffler type add on.And more components and fault codes.This system does not need regens as often. But yes the exhaust does get very hot and would need to be kept very clean.You could not do a regen around anything easily flammable such as dry hay.All operators of such equipment would need to be schooled on what to do/how it works,and don't ignore the warning lights. The reason for the these exhaust systems is first to remove soot from our air,and second,to remove nitris oxides from our air.It ain't perfect but it's the best they can come up with for now. Mark
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