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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.
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.
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.
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.
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% ...
This is the first time a small five-valve engine has been used in an Audi S-series car.. Although dubbed "quattro" , the S3 uses a different "on-demand" four-wheel drive system. [ 1 ] The Haldex Traction coupling adjusts the bias of torque distribution from the front to rear axle as grip requirements change - most of the time it operates as a ...
The first mass-produced viscous couplings for a permanent 4WD off-road-capable vehicle were in the AMC Eagle, which was produced from 1980 to 1988 model years. [2] The AMC Eagle's single-speed model 119 New Process central differential used a viscous coupling filled with a liquid silicone-based material. [ 3 ]
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