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Efficiency gains in diesel aftertreatment systems calibration

For all types of diesel vehicles, US Environmental Protection Agency (EPA) regulations require strategies that induce drivers of vehicles with selective catalytic reduction (SCR) exhaust aftertreatment systems to keep diesel exhaust fluid (DEF) on board and ensure that aftertreatment systems remain functional. In practice, the inducement takes the form of a performance penalty applied by the electronic control unit to the engine in certain circumstances.