Simulated Fuel Economy and Emissions Performance during City and Interstate Driving for a Heavy-Duty Hybrid Truck

The evaluation of developing vehicle technologies on the fuel economy of long-haul trucks

“…To identify the energy saving potential of the developing technologies in Table 1, a baseline conventional Class 8 truck configuration was specified using Autonomie. This baseline truck configuration was adapted from the authors' previous truck model for a Class 8 truck powered with a 2004 Cummins ISX 475 15-L diesel engine [10]. The previous conventional truck model has been validated against the experimental data measured from a 2005 Volvo tractor powered by the same 2004 Cummins diesel engine at West Virginia University [10,16].…”

“…This baseline truck configuration was adapted from the authors' previous truck model for a Class 8 truck powered with a 2004 Cummins ISX 475 15-L diesel engine [10]. The previous conventional truck model has been validated against the experimental data measured from a 2005 Volvo tractor powered by the same 2004 Cummins diesel engine at West Virginia University [10,16]. The predicted and measured fuel economies were 4.55 mpg vs. 4.63 mpg, respectively, over the measured UDDS truck cycle indicating favorable agreement between the model and experimental data.…”

“…Hybridization also provides significant fuel savings for HD vehicles under city drive conditions, which offer many opportunities for regenerative braking [26]. However, potential benefits of hybrid technology in Class 8 HD truck highway applications, particularly long-haul trucks, are still uncertain [1,10]. It is important to understand and maximize hybrid technology potential for fuel economy improvement of Class 8 long-haul trucks.…”

“…Experimental measurements of long-haul trucks reveal that, after engine losses, the next largest energy losses are due to aerodynamic drag and rolling resistance [1,[10][11], which account for nearly 20% and 10%, respectively, of the fuel energy [1,11]. Aerodynamic losses can be considered by dividing the tractor-trailer system into four regions: (1) airflow around the tractor;…”

The GREET Model Expansion for Well-to-Wheels Analysis of Heavy-Duty Vehicles

“…Zhao et al (2013) reported that Class 8 hybrid trucks can achieve improvements of 50% in fuel economy over their conventional diesel counterparts on the simulated urban driving cycle and 28% on the simulated freeway driving cycle. Daw et al (2013) compared the simulated fuel economy and emissions for both conventional and hybrid electric Class 8 heavy-duty diesel trucks operating on multiple urban and highway driving cycles. Results showed that the cumulative fuel savings for the hybrid were up to 36.4% on the city driving cycle, which represented a fuel economy gain of up to 57%.…”