Heavy-Duty Supplemental Emissions Test (SET)

In addition to FTP testing, consent decree engines subject to US EPA 2004 emission standards and model year 2007 and later engines must also demonstrate compliance when tested over the 13-mode Supplemental Emissions Test (SET). There are 2 versions of this test:

• a ramped mode cycle (RMC) and
• a discrete mode cycle (DMC).

The discrete mode cycle SET is equivalent to the European Stationary Cycle (ESC). It is the test used for Consent Decree engines. It can also be used for 2007-2009 model year engines.

The ramped mode cycle SET is applicable to 2007 and later heavy-duty engines. While it contains the same operating modes as the discrete mode test, the transition between modes is defined. Table 1 summarizes the ramped mode SET. Speeds A, B and C are defined in the same way as for the ESC cycle.