While powertrain optimisation is still the prime focus for OEMs when developing a new heavy truck, more and more emphasis is now placed on aerodynamic performance, a new study found. According to a report by ACT Research and Rhein Associates, aerodynamics are increasingly seen as the key to achieving optimal fuel efficiency – especially since North America introduced the next round of Greenhouse Gas (GHG) emissions legislation, which will come into effect in stages from 2018. “In response to future GHG requirements, a large amount of modifications have already been made by heavy duty truck manufacturers,” the report found, saying that although most of these changes have been with revised powertrains, improved aerodynamics are now also a key item on the design agenda. “Aerodynamic improvements include air-smoothed hood and roof designs, new bumpers with integrated air dams, new mirrors, revised fender skirts and rear cab mounted air fairings to better manage the air gap ahead of the trailer,” said Tom Rhein, President of Rhein Associates. He added that these improvements continue to evolve in line with prominent research projects, most prominently the US SuperTruck initiatives. According to Rhein, recent powertrain improvements by OEMs could lead to fuel efficiency improvements of up to eight per cent when combined with aerodynamic improvements. Additional benefits, he added, will come from predictive transmission technology that is able to manage engine speed and transmission selection in line with the current topography.
Truck designers are focusing more on aerodynamics to help increase fuel efficiency, according to a report by ACT Research and Rhein Associates. The report reveals that components such as "air-smoothed hood and roof designs, bumpers with integrated air dams, revised fender skirts and rear cab mounted air fairings" are being implemented ahead of greenhouse gas emissions laws, which take effect from 2018. Rhein, President of Rhein Associates, said when aerodynamic refinements were combined with improved powertrains, fuel efficiencies of up to 8% could be made.