ATTESA E-TS

ATTESA E-TS is the advanced electronic version of Nissan's ATTESA Drivetrain. It is an acronym for Advanced Total Traction Engineering System for All - Electronic Torque Split. The newer version of ATTESA E-TS is called ATTESA E-TS Pro.

How it works

ATTESA E-TS is featured in the north-south layout vehicles, such as the Skyline GT-R, utilises what is mostly a conventional RWD gearbox. Drive to the rear wheels is constant via a tailshaft and rear differential, however drive to the front wheels is more complex by utilising a transfer case at the rear of the gearbox. The drive from the transfer case then passes through a shaft to the front differential which is located inside the engines sump, which then passes drive to the front wheels via drive shafts.

The ATTESA E-TS layout is more advanced than the ATTESA system, and uses a 16bit microprocessor that monitors the cars movements at 100 times per second to sense traction loss. Two G-Sensors mounted underneath the centre console feed lateral and longtitudinal inputs into an ECU. The ECU can then direct up to and including 50% of the power to the front wheels. When slip is detected on a wheel, the system directs the torque away from that wheel to one that has traction. Torque is apportioned using a clutch pack center differential, similar to the type employed in the Steyr-Daimler-Puch system in the Porsche 959.

Rather than locking the AWD in all the time or having a system that is "all or nothing", the ATTESA E-TS system can apportion different ratios of torque to different wheels as it sees fit. This provides the driver with an AWD vehicle that performs like a rear wheel drive vehicle in perfect conditions and can recover control when conditions aren't as perfect. The advantage to a more traditional ATTESA (Viscous LSD) system is response in hundredths of a second.

Models

ATTESA E-TS system is used in the following models:

References

JB Skyline information pages

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How it works

Models

References

See also