 | This article has multiple issues. Please helpimprove it or discuss these issues on thetalk page.(Learn how and when to remove these messages) (Learn how and when to remove this message)
|
XWD, an acronym forCross-Wheel Drive and also known asHaldex Generation 4, is anall-wheel drive system designed byHaldex in partnership withSaab.[1] The XWD is a permanent all-wheel drive system, that can pre-emptively and continuously changetorque distribution beforewheel slip occurs.
The XWD system is designed to improve take-off performance by having the capability to lock the front and rear axles fully. During highway cruising, it can adjust torque distribution, allocating as little as 4% to the rear wheels, a feature intended to improve fuel efficiency. Additionally, the system is engineered to rapidly transfer torque distribution to the wheel with the most grip, providing immediatetraction in various driving conditions. Using the twocouplings, the XWD system can send 85% of its available torque to a single rear wheel.
AnECU continuously collects various data from the car's onboard systems, and in conjunction with the ESC,ABS, and TCS, calculates the best torque distribution in thedriveline.
The XWD system debuted on the 2008 limited editionSaab Turbo X, equipped with an electronically controlledlimited-slip differential (ELSD), and was gradually made available through the rest of the 9-3 line (in sedan and combi body styles). The XWD was the standardpowertrain for the Saab 9-5 from 2010 to 2012, underpinning the 2011Saab 9-4X and was part of theSaab 9-3X, the XUV crossover introduced by Saab in 2009 based on the 9-3 Sport Combi. The XWD system was also later used in theOpel Insignia.
