DEF is used continuously at a rate that depends on the amount of NOx in the exhaust.
Regens do not use DEF. Regens use fuel. There are two different types. Those engines that are equipped with a particulate (soot) filter, inject extra fuel when the soot needs to be burned out of the filter.
Some engines do not have a particulate filter (primarily smaller off road), they only have 2 catalyst sections, the second one being where the DEF is used. In these, there can be a build up of crystallized urea. Once again, extra fuel is injected to heat the exhaust stream and clean the system.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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