Volvo’s High-tech Supertruck Exceeds Program’s Freight Efficiency Goals
Volvo Trucks North America has unveiled an innovative Supertruck demonstrator whose combination of advanced aerodynamics, vehicle and powertrain technologies achieved a freight efficiency improvement of 88 percent – exceeding the 50 percent improvement goal set by the U.S. Department of Energy (DOE) program.
From the top-of-cab solar panels powering its battery and interior lights, to its ultra-light aluminum frame and highly advanced 425 horsepower 11-liter proprietary engine, the Supertruck concept vehicle allowed Volvo engineers to push the boundaries of heavy truck efficiency. The sleek tractortrailer combination boosted fuel efficiency by 70 percent – exceeding 12 miles per gallon, with some test runs showing more than 13 miles per gallon – in road tests, and powertrain brake thermal efficiency reached 50 percent.
The Supertruck program was a five-year DOE research and development initiative to improve freight efficiency – meaning more payload carried while burning less fuel – by 50 percent compared to 2009 base model trucks. The DOE recently selected the Volvo Group to participate in DOE’S Supertruck II program, which will target a 100 percent improvement on a ton-mile-per-gallon basis, and a powertrain capable of 55 percent brake thermal efficiency.
Volvo’s aerodynamic Supertruck has a shorter front end than conventional trucks on the road today, and the hood has a sharper downward slope. Lightweight fairings run the length of the tractor and trailer, and cameras have replaced rearview mirrors. Its redesigned chassis is made almost entirely of aluminum, which halved the chassis weight and contributed to an overall tractor-trailer weight reduction of 3,200 pounds. An enhanced version of Volvo’s I-see, a new feature that memorizes thousands of routes traveled and uses that knowledge to optimize cruise speed and keep the I-shift automated manual transmission in the most fuel-efficient gear possible, was an integral part of the fuel efficiency gains seen during Supertruck on-road testing. A key part of the overall efficiency gain is the downsized 11-liter Volvo engine, featuring advanced fuel injection, cooling, oil and turbo-charging systems, as well as new “wave” pistons and other improvements. The Supertruck powertrain includes a complex Rankine waste-heat recovery system, which converts heat normally wasted in exhaust into torque, boosting fuel economy by helping to power the vehicle. While not every technology demonstrated in the Volvo Supertruck will be commercialized, three of the engine advancements developed through Supertruck research – the wave piston, turbo compounding system and common rail fuel injection system – are already featured in Volvo Trucks’ 2017 engine line-up. Likewise, a number of Supertruck- derived aerodynamic improvements – like flared chassis fairings improving air flow around the drive wheels, a redesigned bumper and turbulencereducing deflectors – can be found on today’s Volvo VNL tractors.