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The Differences Between Audi Quattro and BMW xDrive
The Differences Between Audi Quattro and BMW xDrive
Published: 2017/02/17
Channel: Car Throttle
BMW xDrive: more performance, more safety for you.
BMW xDrive: more performance, more safety for you.
Published: 2016/12/23
Channel: BMW
quattro Vs xDrive Vs 4MATIC - Audi Vs BMW Vs Mercedes-Benz 4X4 System
quattro Vs xDrive Vs 4MATIC - Audi Vs BMW Vs Mercedes-Benz 4X4 System
Published: 2017/05/09
Channel: AUTO Mania
audi quattro vs bmw xdrive vs mercedes 4matic snow test
audi quattro vs bmw xdrive vs mercedes 4matic snow test
Published: 2016/09/25
Channel: urerodion
BMW xDrive All-Wheel Drive vs. The Competition
BMW xDrive All-Wheel Drive vs. The Competition
Published: 2012/12/24
Channel: BMW Canada
What is BMW xDrive?
What is BMW xDrive?
Published: 2015/01/23
Channel: BMW UK
BMW 328i xDrive in Snow
BMW 328i xDrive in Snow
Published: 2013/02/09
Channel: Taylor Cook
Trazione integrale BMW xDrive: come funziona la tecnologia BMW?
Trazione integrale BMW xDrive: come funziona la tecnologia BMW?
Published: 2017/01/23
Channel: BMW Italia
Tecnología BMW xDrive: Sistema inteligente de tracción a las cuatro ruedas de BMW.
Tecnología BMW xDrive: Sistema inteligente de tracción a las cuatro ruedas de BMW.
Published: 2017/01/23
Channel: BMW España
Audi Quattro vs BMW xDrive in Snow ❄️ 😛
Audi Quattro vs BMW xDrive in Snow ❄️ 😛
Published: 2017/01/23
Channel: asTUBE
Objavte BMW xDrive.
Objavte BMW xDrive.
Published: 2017/06/20
Channel: BMW Slovensko
Audi Quatro vs BMW XDrive vs Range Rover - Snow off road
Audi Quatro vs BMW XDrive vs Range Rover - Snow off road
Published: 2017/01/14
Channel: Car vs Car
The all-new BMW M5 with M xDrive. In-depth.
The all-new BMW M5 with M xDrive. In-depth.
Published: 2017/05/23
Channel: BMW M
Audi - The quattro principle VS BMW xDrive Technology Explained
Audi - The quattro principle VS BMW xDrive Technology Explained
Published: 2016/12/05
Channel: AUTO Mania
BMW M760Li xDrive 시승기 2부, 럭셔리 세단 수퍼카의 신기원, 빠른 것은 중요해!
BMW M760Li xDrive 시승기 2부, 럭셔리 세단 수퍼카의 신기원, 빠른 것은 중요해!
Published: 2017/06/26
Channel: Motorian모터리언
BMW xDrive Off-road Experience Bangalore | QuikrCars
BMW xDrive Off-road Experience Bangalore | QuikrCars
Published: 2017/06/10
Channel: Quikr
BMW in Snow 0-60 mph.  2014 328i xdrive
BMW in Snow 0-60 mph. 2014 328i xdrive
Published: 2016/01/12
Channel: Jon Flynn
Der neue BMW X3 mit BMW xDrive.
Der neue BMW X3 mit BMW xDrive.
Published: 2017/06/27
Channel: BMW Deutschland
Nuevo BMW M5 - ¿Cómo funciona la tracción M xDrive?
Nuevo BMW M5 - ¿Cómo funciona la tracción M xDrive?
Published: 2017/06/13
Channel: BMW España
BMW xDrive vs. Audi Quattro 2017 - Winter Time ⛄️
BMW xDrive vs. Audi Quattro 2017 - Winter Time ⛄️
Published: 2016/12/27
Channel: 3ASaliji
BMW xDrive 2013 review - Car Keys
BMW xDrive 2013 review - Car Keys
Published: 2013/05/03
Channel: Car Keys UK
2014 BMW 435i xDrive 0-60 MPH Review
2014 BMW 435i xDrive 0-60 MPH Review
Published: 2014/03/23
Channel: The Fast Lane Car
BMW xDrive Experience: playing in the mud with the X1, X3, X4, X5 and X6
BMW xDrive Experience: playing in the mud with the X1, X3, X4, X5 and X6
Published: 2017/03/17
Channel: DriveMag
BMW X-Drive 4X4 System
BMW X-Drive 4X4 System
Published: 2012/02/12
Channel: ADPTraining
Quattro vs Xdrive vs Symmetrical AWD
Quattro vs Xdrive vs Symmetrical AWD
Published: 2016/02/05
Channel: e90 vi
POV: HOW GOOD IS BMW
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Published: 2016/12/13
Channel: ORO
BMW M235i X-Drive - (Dry Track) One Take
BMW M235i X-Drive - (Dry Track) One Take
Published: 2015/06/18
Channel: TheSmokingTire
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Published: 2012/10/19
Channel: BMW Malaysia
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Published: 2017/06/26
Channel: AutoMotoTube
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Quattro vs xDrive - Audi Q5 gegen BMW X3
Published: 2010/10/14
Channel: Markus Petter
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BMW xDrive의 작동 원리
Published: 2017/03/02
Channel: mocle 모클
BMW xDrive - Get Out There
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Published: 2016/10/14
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BMW xDrive Offroad Experience 2015
Published: 2015/02/27
Channel: Turatii
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Published: 2017/06/26
Channel: CHEEKY CARS7
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Published: 2017/01/16
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Published: 2016/05/10
Channel: CarQuestion
Audi Quattro ve BMW xDrive Nasıl Çalışır? Farkları Nedir?
Audi Quattro ve BMW xDrive Nasıl Çalışır? Farkları Nedir?
Published: 2017/03/28
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RATE the BMW M550i xDrive | Power, Daily & Sports Driving, Looks and Sound
Published: 2017/06/22
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BMW xDrive Technologie
Published: 2010/11/21
Channel: Petar Dimitrov
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BMW xDrive vs. Audi Quattro - Winter Time
Published: 2017/01/04
Channel: Adrenaline
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Published: 2011/02/18
Channel: WatchMojo.com
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BMW M xDrive Jumping Jack.
Published: 2017/05/17
Channel: BMW M
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BMW xDrive. Все гениальное просто.
Published: 2014/02/27
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BMW xDrive - How does it works
Published: 2016/03/19
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BMW X1 2015 18d sDrive y 20d xDrive - Prueba revistadelmotor.es
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Das Prinzip von BMW M xDrive entdecken.
Published: 2017/05/17
Channel: BMW Deutschland
2013 BMW 328i xDrive Review on Everyman Driver
2013 BMW 328i xDrive Review on Everyman Driver
Published: 2013/08/09
Channel: Everyman Driver
BMW X3 2,0l 20d xDrive explicit video 1 of 2
BMW X3 2,0l 20d xDrive explicit video 1 of 2
Published: 2014/12/15
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2010 BMW X5 3.0i xDrive Walkaround, Start up and Tour
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Published: 2014/06/01
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Test ACURA SH-AWD System before buy BMW Xdrive
Test ACURA SH-AWD System before buy BMW Xdrive
Published: 2017/02/23
Channel: L L 2 4
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WIKIPEDIA ARTICLE

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BMW X3 xDrive20d (F25 LCI)
xDrive

BMW xDrive is the marketing name for the all-wheel drive system found on the BMW X1, X3, X4, X5, and X6 crossover sport activity vehicles. It is also optional on the 1 Series (2012–present), 2 series (2015-present), 3 Series (2000–present), 4 Series (2014), 5 Series (2005–present), 6 Series (2012–present), and 7 Series (2010–present).

Description[edit]

Instead of a permanent torque split (which is featured in earlier systems), xDrive provides variable torque split between the front and rear axles through the use of a multi-plate wet clutch located in the gearbox on the output to the front drive shaft. This setup allows xDrive to modulate the torque split between the front and the rear axles, which is normally split at 40:60 ratio, respectively. If wheel slip is detected by the ABS/DSC system, xDrive can react within a tenth of a second to redistribute up to 100% of the engine power to the front or rear axle.[1] The wet clutch is applied through a high speed electric servo motor turning a cam-shaped actuator disc. As the rear drive shaft is hard-coupled to the transmission output, full torque transfer to the front axle can only be achieved if the rear wheels have no traction and are both slipping.

xDrive is connected to the ABS and DSC systems. In the case that wheelspin or directional instability still occurs while xDrive is or has been modulating the torque split, DSC will brake independent wheels to regain traction and improve directional stability without driver intervention.

The front and rear differentials in xDrive vehicles are typically an open differential design, thus relying on brake application by the DSC system to transfer power from the slipping wheel to the wheel with traction.

A variation on the xDrive system is present in the 2015 BMW X1 (F48), which is based on a front-wheel drive design with a transversely-mounted engine. In the FWD-derived xDrive variant, the front wheels receive 100% of the torque when the xDrive clutch is open, giving it a front bias instead of the usual xDrive rear bias.[2]

Applications[edit]

xDrive is available on the X1, X3 and is standard equipment on X5, and X6 and BMW X6 M crossover sport activity vehicles. It is also optional on the 1 Series (2012-present) 3 Series (2002–present for sedans, 2007-2013 for coupes), 4 Series (2014-present), 5 Series (2005-present), 6 Series (2012–present for coupe and Gran Coupe), and 7 Series (2010–present).

BMW gradually expanded the availability of xDrive across its whole lineup to better compete with Audi's quattro and Mercedes-Benz's 4Matic, the latter two which are widely available across their respective offerings. As of the 2010-12 model years, BMW Canada has even stopped offering RWD trims if an xDrive counterpart is available for its 5 Series, 6 Series, and 7 Series cars, a major reversal from the 2009 model year and prior where only the BMW 528i and 535i were available with xDrive. BMW Canada's switch has surprised some observers, as AWD was "once the sole purview of Audi with a few odd-duck Mercedes mixed in, the switch to AWD is so strong that many luxury models are now predominantly AWD, though the 650 is the first high-end sport coupe defection among BMWs. Even more surprising is that the Coupe will only be available in AWD guise; if you want a 650 that powers only the rear wheels, you’ll have to opt for the ragtop version."[3]

xDrive was introduced in 2003 with the new X3 and the refreshed BMW 3 Series (E46).

The first application of xDrive on V8-powered BMW cars (as opposed to crossover sport activity vehicles) was on the 2010 BMW 750i xDrive (F01), 2010 550i Gran Turismo xDrive (F07), and the 2011 BMW 550i xDrive (F10).

xDrive was first used on BMW M vehicles starting with the 2010 BMW X5 M and X6 M. BMW also confirmed that they are looking into producing a BMW M5 with xDrive, although an availability date has not been confirmed.[4]

Dynamic Performance Control[edit]

BMW's Dynamic Performance Control torque-vectoring system works in unison with xDrive all-wheel drive and Dynamic Stability Control. DPC is a drivetrain and chassis control system that works to regulate traction and especially correct over- and understeer by actively spreading out drive forces across the rear axle. Torque is split not only between the front axle and rear axle (xDrive), but also between wheels at the rear for improved agility and added stability (through the DPC rear axle).[5] DPC works at all speeds and normal driving, not just during hard cornering, in order to steer the car. DPC also interfaces with DSC to initially try to correct the vehicle's path using torque vectoring which results in smooth turns, whereas DSC by itself would only reduce engine power and apply the brakes to steer the vehicle.[6]

The DPC differential features clutch packs on both output sides that are actuated by an electric motor. The clutch pack activates a planetary gearset which causes one wheel to be overdriven. A conventional control system, such as BMW's typical xDrive system without Dynamic Performance Control, relies on brakes to reduce the speed of the faster-moving wheel (which is the one with less traction) and reduce engine power to limit slip at that wheel. This leads to increased brake wear, and slows the vehicle's optimal progress. By contrast, xDrive when integrated with DPC will speed up the slower-moving, not slipping wheel (the one with the most traction) in order to maintain stability when needed. For example, during vehicle turning, the outer wheel is overdriven to provide greater acceleration, using the traction advantage through the dynamic loading of the outboard wheel in cornering. Meanwhile, in an oversteer situation, the inner wheel is overdriven to regain traction balance. This provides additional traction across the axle of the vehicle, while at the same time maintaining more of the vehicle's optimal progress through turns.

The first application of DPC was introduced on the BMW X6, which began production in 2008 as a 2009 model, where it is a standard equipment.[7] A test found that "the X6 feels hundreds of pounds lighter on its feet than an X5 [without DPC]" due to the benefit of DPC even though both vehicles have similar chassis dimensions.[6] The BMW X5 M high performance variant also has standard DPC.[8]

Predecessor AWD system[edit]

Before xDrive, BMW offered AWD as an option in the 1980s for the 3 series and the 5 series. The system had a Viscous coupling in the center and rear differentials. Until wheel slip occurred, the transfer case had a 37:63 (front-back) torque split due to the planetary gear. When one axle spins quicker than the other, the shear force of the silicone fluid increases as the VC slips (due to the slotted/grooved plates inside the unit). This would instantly transfer up to 80% of the available torque to the gripping axle. This same function worked in the cars rear differential. The front differential had no lock of any kind.

AWD was again offered for the X5 and the 2001 3 series. The system was similar to the earlier system except without any of the locks. Instead, slipping wheels would be braked with the DSC system, helping transfer power to the wheels with traction.

References[edit]

  1. ^ "xDrive: the intelligent all-wheel drive system from BMW". BMW. Retrieved 2012-07-28. 
  2. ^ "F48 technical training docs". Retrieved 2016-12-19. 
  3. ^ "Car Review: 2012 BMW 650i xDrive". 10 November 2011. 
  4. ^ Damon Lavrinc (2010-10-18). "Six Things We Learned at BMW M". Autoblog. Retrieved 2012-07-28. 
  5. ^ "Dynamic Performance Control". BMW international website. Retrieved 18 March 2011. 
  6. ^ a b http://www.automobilemag.com/reviews/driven/0807_2009_infiniti_fx50_2009_bmw_x6_xdrive50i/viewall.html
  7. ^ "2008 BMW X6 xDrive35i and xDrive50i". Car and Driver. Retrieved 2012-09-30. 
  8. ^ GmbH, Interone Worldwide. "BMW X5 M : Dynamic Performance Control". 

External links[edit]

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