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The second generation of Haldex coupling is an electronically controlled permanent 4x4 system with a Haldex differential calculating how much drive should be directed to the rear wheels. The Haldex system automatically distributes power between the front and rear wheels depending on slippage, but normally sends 95% of the power to the front wheels.
The technology had also been updated. Four wheel drive was powered by the fifth generation Haldex electro hydraulically controlled multi plate coupling located at the rear axle in the same housing as the final drive and rear differential. The operating principle was much the same as the fourth generation used in the pre facelift previous model.
The R uses an updated, fifth-generation Haldex 4MOTION four-wheel drive system. Under low loads or when coasting, the rear axle is decoupled, helping to reduce fuel consumption. Drive to the rear axle can be engaged in fractions of a second via the Haldex coupling, which is actuated by an electro-hydraulic pump.
XWD, an acronym for Cross-Wheel Drive and also known as Haldex Generation 4, is an all-wheel drive system designed by Haldex in partnership with Saab. [1] The XWD is a permanent all-wheel drive system, that can pre-emptively and continuously change torque distribution before wheel slip occurs. Saab Turbo X, the launch vehicle for Saab XWD
Haldex co-owned (from 2004) the company Alfdex with Alfa Laval, for production of separators for truck engines. Haldex after 2011: In 2011, the Traction division was divested to BorgWarner, including the all-wheel drive. The hydraulic division formed a new company called Concentric and was listed on the Stockholm stock exchange.
Starting with the Mk4 generation A4-platform, the viscous coupling has been dropped in favour of a Haldex Traction electro-hydraulic limited-slip "coupler" (LSC) or clutch. The Haldex Traction LSC unit is not a differential and therefore cannot perform in the true sense like a differential. A Haldex Traction unit may divert up to a maximum 100% ...
The change to the Haldex system also changes the handling closer to a front-wheel drive car. Compared to the Torsen, the Haldex can direct torque more unequally to the front wheels (from 100:0 to 50:50 front-to-rear bias), thus providing a wider bias range than the 75:25 to 25:75 of the B5 Passat. Haldex is a reactive-type system, behaving as a ...
The 4WD system was developed in conjunction with Haldex and was called Third generation coupling. Vehicles from the 2009 model year are fitted with a modified design of the active on-demand coupling, known as Haldex's Fourth generation. The new Freelander was first marketed in the U.S. in 2007 as the LR2. The 2008 version is called the LR2 HSE.
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