The drive cycles suitable for trucks and buses for chassis dynamometer testing have been presented previously
[20]. The data used in this analysis arose from E-55/59 chassis testing that was performed on the Urban Dynamometer Driving Schedule (UDDS) and the Heavy Heavy-Duty Diesel Truck (HHDDT) drive schedule [8]. The
UDDS is a seventeen minute cycle with a peak speed of 60 mph and is representative of the heavy-duty driving
in US urban conditions. The development and examination of HHDDT schedule was presented elsewhere [21]
[22]. The HHDDT schedule consists of five modes (Idle, Creep, Transient, Cruise and High-speed cruise). The
creep mode represents very low speed truck operation with a maximum speed of 8.24 mph. The transient mode
of HHDDT is a ten-minute drive that mimics the vehicle stopping and going at an average speed of 20 mph. It
involves sharp accelerations and decelerations with a peak speed of less than 50 mph. The cruise mode of
HHDDT cycle, which is representative of truck driving on the interstate, is a 2000 second cycle with constant
peak speed of approximately 60 mph for about 1400 seconds. The high-speed cruise mode is represented by
HHDDT_S. It has an average speed of 50 mph and a maximum speed of 67 mph and it represents expressway
truck driving. The speed time traces of all the cycles have been provided elsewhere [20] [21].