Abstract
Natural wind influence on fuel consumption (WIF),βf for a highway heavy truck (80km/h(22.2m/s)) is studied of which the aerodynamic drag to yaw angles is approximated for a flat body. The quartered mean wind directions in the real wind model which was previously proposed for passenger cars (100km/h(27.8m/s)) to understand the short-term WIF by us is here similarly applied to a heavy truck to obtain the short-term averaged WIF,βfi for mean head wind(i=1 ,|Θ|<45°C), mean side wind(i=2 and 4, 45°C<|Θ|<135°C) and mean tail wind(i=3, |Θ|>135°C) where Θ denotes wind direction. The short-term WIF for a truck at headwinds is shown to be large while the long-term WIF estimated with the extended application of SAE J1252(1981) is small.
