Automakers Eye Weight Reductions to Meet Fuel Economy Goals
October 25, 2012 9:45 AM
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Hydroforming and new welding methods help reduce vehicle weight
New CAFE standards
have automakers reaching for any technology they can find to help improve fuel economy. Many manufacturers are going to electric vehicles or hybrids to increase their overall fleet mileage averages. The problem with focusing only on hybrids and electric vehicles, however, is that most consumers aren't in the market for that type of vehicle.
On traditional gasoline-powered vehicles, automakers are increasingly turning to weight savings as a way to help improve fuel economy. The lighter a vehicle can be made, the less weight the engine has to push or pull around and the less fuel it uses because engines could be made smaller without sacrificing performance.
Some automakers are even turning to removing some features of cars such as CD players and the spare tire to reduce weight according to the
. Both General Motors and Ford are turning to new processes in vehicle assembly to help remove weight from the body of mainstream vehicles.
2013 Ford Fusion
Many automakers are using aluminum rather than steel to help reduce the weight of their vehicles. Hoods, trunks, and lift gates as well as door skins are commonly made from aluminum today. Ford is also
experimenting with carbon fiber
on the Focus.
Switching to lighter materials isn't the only way automakers are going about reducing the weight of the vehicles they produce. They're also reducing weight by changing the manufacturing processes used. Ford, for instance, is using hydroforming on the steel structural pillars of its
One of the big benefits of hydroforming is that it allows the forming of complicated and larger parts that don't need to be welded together. Traditional stamping produces multiple parts that have to be welded at joints. Those joints are points of weakness and add weight. Using hydroforming, rather than other forms of stamping, sheds 18 pounds from each car by eliminating the additional welds.
GM is also doing its part testing a thermal-forming process for lightweight magnesium that weighs 75% less than steel. GM also plans to use a patented welding technology to allow the company to integrate more aluminum into automotive bodies by saving the company from using rivets to join aluminum body panels. The use of the welding process rather than rivets will cut nearly 2 pounds from parts such as hoods, lift gates, and doors.
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RE: Bout time
10/25/2012 1:44:22 PM
Fuel efficiency numbers in the US are published by the US EPA, who can't be sued. Automakers aren't liable for the EPA's actions. Automakers usually publish EPA numbers only whether they agree with them or not - this shields them from liability.
RE: Bout time
10/25/2012 3:58:41 PM
I think it was Honda or Toyota that lost a suit in small claims court when a woman showed that she wasn't able to achieve the EPA MPG. Since car companies market their cars based on that rating, it opened the door. If I recall, some appeals court ended up overturning it, but I don't remember on what grounds. The point is, though, that it does appear that the auto companies can be sued over this.
RE: Bout time
10/25/2012 5:46:22 PM
Those lawsuits were prior to the current system.
At the time of those lawsuits, the methods used to rate mpg were 'best case' scenarios that simply weren't possible in the real world.
The EPA completely revamped the methods they used to compute mpg ratings in 2008, primarily because of the lawsuits and general public complaints about the unrealistic ratings that were being used.
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