Ny Teknik on the new Saab/eAAM electronic rear axle

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?

Saab e-AAM by NyTeknik

Thanks to Patrik B for the tip!

Mats Fägerhag on Saab’s new e-AAM Driveline Systems company

I’ve just got off the phone with Mats Fägerhag, Saab’s chief technical guru. We talked a little about the new e-AAM Driveline Systems venture that Saab has set up with American Axle Manufacturing.

Saab owns one third of the new company, which will be based in Trollhattan. AAM own the remaining two-thirds.

Here are the dot points from that conversation…..

Saab already use a class-leading all-wheel-drive system in Haldex’s XWD, but one of the downsides with it is that it brings a 10-12% penalty in fuel economy. That’s because the system works so well in terms of moving torque around to different wheels, keeping the car stable, predictable and dynamic when you need it to be – it all takes energy. Saab’s aim in researching this new system is finding a way to maintain XWD-like stability whilst substantially improving fuel economy.

The system that Saab have been developing since the carve-out from General Motors is an all-new system, developed by Saab. The patents and IP belong to Saab and this has been approved by GM.

Saab was the lead center for all-wheel-drive development within GM, so they built up a very experienced team that has been able to work quickly on this new technology once Saab were separated from GM.

Read moreMats Fägerhag on Saab’s new e-AAM Driveline Systems company

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