The cheat was to operate the engine so it passed the NOX and
particulate emissions standards ONLY when it was being tested -- when
not being tested, emissions were somewhat higher. The 40X above the
limit is misleading, the limit for NOX is very low, so 40 time that
isn't much.
When the vehicle was not being tested, it ran higher emissions and
PROBABLY had more power. It also used far less urea solution (the
supply is about a liter bottle, I think). As I said, I don't think
those small diesels can meet the standard and have adequate power for
the consumer. Big trucks meet the particulate standards by trapping
the soot and adding fuel and air to burn it out.
Peter
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