US: Heavy-duty: UDDS

The EPA Urban Dynamometer Driving Schedule (UDDS) has been developed for chassis dynamometer testing of heavy-duty vehicles [CFR 40, 86, App.I].

This test is sometimes referred to as &#8220;cycle D&#8221;. The UDDS schedule was a basis for the development of the FTP Transient engine dynamometer cycle. The HD-UDDS cycle should not be confused with the FTP72/LA4 cycle for light-duty vehicles, which is also called UDDS.

HD-UDDS Cycle

The following are basic parameters of the cycle:
 * Duration: 1060 seconds
 * Distance: 5.55 miles = 8.9 km
 * Average speed: 18.86 mi/h = 30.4 km/h
 * Maximum speed: 58 mi/h = 93.3 km/h