Ny Teknik on the new Saab/eAAM electronic rear axle
October 6, 2010 in News
Swedish technology gurus Ny Teknik have just published an article taking a closer look at the new rear axle setup being developed by the new joint venture between Saab and American Axle, called e-AAM.
The people involved are pretty positive about things, too.
This is bigger than the turbo and everything else that Saab has developed, “said the engineer Erik Sten, who has been involved from the beginning.
They summarise the need for such a system thus:
Today offers virtually all automakers wheel-drive cars.
In many of them, the entity that distributes power between front and rear wheels from the Swedish company Haldex. Four-wheel drive doubles the car’s traction on difficult surfaces and provide better traction on snow-covered slopes – especially if the car pulls a trailer.
The most advanced systems also allocates additional power to right the wheels that need it most, such as the outer wheels in a curve.
The disadvantage is that the mechanical power transmission between front and rear wheels will increase the weight by up to 100 kg. In addition, the friction losses. Altogether it gives in practice about 10 percent higher fuel consumption.
And the potential advantages of e-AAM’s system…..
Saab’s model is much easier. Less than 60 kg, including electronics and battery. It reacts faster than mechanical systems, which increases security. It also helps the driver stay on course on slippery roads by individual control of the torque (torque vectoring). But perhaps the biggest advantage is that it reduces consumption.
Compared with a mechanical all-wheel drive will save you between 14 and 30 percent, says Magnus Ryde, marketing manager for EAAM.
If you’re Swedish, get along and read the original article for yourself.
If you’re not Swedish, run that link through Googletrans and read the rest.
Perhaps one of you Swedes could give us a hand deciphering Ny Teknik’s diagram?
Thanks to Patrik B for the tip!