Quote:
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Originally Posted by Fireball
There is one more thing, if the speed is over 30km/hr (M/H, Sorry, I forgot whether it is km or mile), the AWD system will switch back to FWD no matter the system is lock to AWD or Auto. Please correct me if I am wrong.
Regards
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http://www.autos.canada.com/national...aspx?year=2491
"X-trail AWD system is Nissan's ATTESA E-TS, variations of which are found in the Pathfinder, Murano and Infiniti GS-X. This system uses active torque management technology with an electromagnetic clutch to power the four wheels. In the X-Trail, the system can be set on "2WD," which gives front-wheel-drive for the best fuel economy, "Auto," which starts with a 50/50 front-to-rear power distribution but will change that ratio depending on road conditions, and "Lock," where the 50/50 power-split is fixed at speeds up to 30 km/h."
you can check the Nissan's ATTESA E-TS Demo at :
http://www.infiniti.ca/eng/models/fx45/index.html#
The different between FX45/35 and X-trail AWD system is,
1) From start still, Fx45/35 torque split in 25:75, but x-trail is 50:50
2) In Normal condition, Fx45/35 torque split 0:100, x-trail is 100:0
3) in slipperycondition, both are same(power shift one-tenth second to the wheels that need it most
4) snow mode in Fx45/35, same as Lock mode in x-trail, torque splite 50:50 at speed up to 19km in Fx45/35 , 30km in x-trail
More detail about ATTESA-ETS on skyline R32
http://www.jbskyline.net/R32/GTR/index2.php
"The GT-R uses an electronically controlled all-wheel-drive system (similar to Porsche's 959). A 16-bit microprocessor monitors the car's movements a 100 times per second, including wheel rotation and lateral as well as longitudinal acceleration. When slip is detected at a driving wheel, the system electronically distributes torque from this spinning wheel to one without slip.
In this case the electronic AWD-system offers the advantage that actions are enacted much faster than by a viscous-coupling-system (we're speaking of hundredths of a second here). In standard setup, ATTESA-ETS distributes the torque to the rear-wheels, but when slip is detected on one of those rear-wheels, it can distribute up to 50% of the torque to the front wheels, i.e. it can adjust the front/rear torque-split from anything between 0:100 to 50:50. Among the rear-wheels, an active LSD can further distribute the torque from one wheel to the other if necessary. Due to this setup, the Skyline GT-R can even drift, although it is an AWD car."
