Volvo Trucks SuperTruck demonstrator improves freight efficiency by 88%, fuel efficiency by 70%
15 September 2016
Volvo Trucks North America unveiled an innovative SuperTruck demonstrator whose combination of advanced aerodynamics, vehicle and powertrain technologies achieved a freight efficiency improvement of 88%—exceeding the 50% improvement goal set by the US Department of Energy (DOE) Supertruck I program.
The sleek tractor-trailer combination boosted fuel efficiency by 70%—exceeding 12 mpg, with some test runs showing more than 13 mpg—in road tests, and powertrain brake thermal efficiency reached 50%.
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| Volvo Trucks North America unveiled an innovative SuperTruck demonstrator whose combination of advanced vehicle and powertrain technologies achieved a freight efficiency improvement of 88% and boosted fuel efficiency by 70%, exceeding 12 miles per gallon in road tests. Click to enlarge. |
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 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% 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% improvement on a ton-mile-per-gallon basis, and a powertrain capable of 55% brake thermal efficiency. (Earlier post.)
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 (1,451.5 kg).
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. (This new design added “wave” bumps on the side of the piston bowl, which allows the fuel to burn more cleanly.)
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.
A new turbo compounding system was designed to recover normally wasted energy on the 2017 Volvo D13 with Turbo Compound, helping boost fuel efficiency by up to 6.5%. The patented wave piston, working in combination with Volvo’s other engine enhancements, delivers improved fuel efficiency of up to 2.2% for the D11 and 2.5% for the D13.
The order of magnitude efficiency leap achieved by our SuperTruck is a testament to the outstanding work done by our team and our partners. We started by rethinking everything, and we discovered that with every layer you peel back, you uncover new opportunities.
—Pascal Amar, principal investigator for the project
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—such as flared chassis fairings improving air flow around the drive wheels, a redesigned bumper and turbulence-reducing deflectors—can be found on today’s Volvo VNL tractors.
Not every idea made it to the concept vehicle. Working with suppliers and academic partners, the team explored the performance and safety of a number of lightweight materials. While some of these, like recycled carbon fiber, were not used in the SuperTruck, the knowledge gained in material science will be applied to future programs.
Volvo used computer-aided engineering to reimagine nearly every part of the tractor and trailer without costly prototyping. While the VNL “body in white” was mostly maintained in order to save time and ensure structural integrity, everything else—including the front end, the cab exterior pieces, the chassis fairing and the roof—were completely redesigned to maximize the aerodynamics of the tractor-trailer combination.
There is technology readily available to address additional fuel savings but if they did not build the equipment I see they have not included anyone else's products. So sad, that this is not something that could include an additional 15% increase in fuel mileage if only taken into effect.
Posted by: Clint44281 | 15 September 2016 at 05:03 AM
Since we have no idea how expensive the two main items are, the "complex Rankine waste-heat recovery system" and "new turbo compounding system", maybe the thing will never be commercially viable?
That said I applaud Volvo for the aluminum, smaller engine and computerized routing with fuel management systems - seems like all things that can be added quickly to an upgraded trucking fleet.
Seems like the good-old days of iron, steel and diesel is giving way to aluminum, computers and aerodynamics - just what the industry needs.
Of course the entire fleet will be driverless in 10 years, so who is going to employ those 3 million folks ???
Posted by: Juan Valdez | 15 September 2016 at 06:54 AM
@Juan "entire fleet will be driverless in 10 years"
That is an interesting comment, but probably an exaggeration.
I imagine there are still things that a driver needs to do so they won't be able to get rid of the drier yet.
Bt you might get trucks that can drive themselves all night enabling the driver to sleep and then bring the truck into ports or loading bays in the morning.
This would keep people employed for a while longer.
As time goes by, more and more of these things will get automated so drivers may well get laid off, the questions is how quickly.
+ I agree on the costs - how much would this cost and what would the payback be - at $45 oil.
I also wonder why truckers don't use skirts at present - there must be some reason beyond conservatism and ignorance - ramps perhaps ?
Posted by: mahonj | 15 September 2016 at 07:30 AM
Juan Valdez
The article states that the turbo compounding system is available in the 2017 engine program.
Posted by: sd | 15 September 2016 at 07:41 AM
It is amazing how mostly well known technologies can improve heavy trucks performances by 88% or so.
With further fine tuning 100+% performance improvement could be reached?
Why is it being delayed?
Posted by: HarveyD | 15 September 2016 at 10:01 AM
Considering a fully loaded semi truck might get 4 mpg on the open road,
this is a good news.
Posted by: SJC | 15 September 2016 at 10:36 AM
Can they also improve my car efficiency 80%, im sick and tire of doing just 36 mpg with my 2005 dodge neon 5 speeds manual.
Posted by: gorr | 15 September 2016 at 01:28 PM