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#1
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what is dynamic x drive?
thanks. |
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#2
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Dunno...I went back and reread the PR, but the only section
I could find that seemed related was this paragraph on Traction Control which seems to "numb"/delay the onset of the DSC. Or, it could be a tweaking of the XDrive itself... Hard to know at this point. GL,mD Dynamic Traction Control for greater spin and more dynamic performance. Reflecting its high standard of driving dynamics, the new BMW X5 also comes with Dynamic Traction Control. All the driver has to do to activate the DTC mode is press a button on the center console. This raises the threshold for intervention of the engine and brakes by DSC, allowing the BMW X5 to set off smoothly on loose snow or sand with the drive wheels intentionally spinning slightly. Last but certainly not least, DTC promotes an even more sporting and active style of driving by allowing more wheel-spin before intervening.
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#3
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Dynamic xDrive is similar to Honda / Acura's SH-AWD: it is able to distribute torque not only front vs rear, but also left vs right. With Ver. 2.0. xDrive DSC, ABS, etc systems can brake seperate wheel so in the most extreme limits e.g. rear right wheel can get 50% of all torque available to the wheels (100% torque to rear axle, left wheel totally braked). With Dynamic xDrive in the same case 100% torque will be distributed to the specific wheel, so no perfomance will be lost (like today). This will be the most important new feature of Ver 3.0 xDrive, others will include even better collaboration of xDrive & other systems (DSC., ABS, gearbox, suspension, engine etc), FlexRay data transfer protocol also for xDrive, etc. After debuted in X6 Dynamic xDrive will then be creep in other new BMW vehicles (V5), current models will get it with facelift (X5, 3er), or with new generation (7er, 5er, X3). |
#4
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is the difference noticeable between the original x5 awd system in 2002ish vs. the new one that came out in 2004? |
#5
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Dynamic xDrive is even more dynamic driving / performance driving capable - especially traction & stability in high speed cornering are improved. It will provide even better handling & steering. There will be also off-road advantages.
Pair Dynamic xDrive with Adaptive Drive / Dynamic Drive system -> perfect combination. SH-AWD is heavier and not so much connected to other car systems like Dynamic xDrive will be - also thanks to FlexRay. So Dynamic xDrive is expected to be more efficient than SH-AWD. The idea behind both systems is identical, but realisation is different. Btw, mind that BMW are quite new to AWD systems - they are enhaching the system with time. New testing facilities, and better colaboration with outsource engineers are providing much quicker & more efficient development. |
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#8
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so can someone easily and simply explain the different awd systems in the x5 over the years ? here's my understanding:
1) original x5's: 60% rear and 40% front under normal conditions. Car can apply brakes to any given wheel, but maximum power a single front wheel is 20% and a single rear wheel is 30%. 2) 2004 models: same ratio as above, but now car can also distribute power front to back, so 100% can go to front or rear wheels. braking individuals wheels are the same, so max at one front wheel is 40% and one rear wheel is 60% 3) new 2007 models: same as system introduced in 2004??? 4) next generation, 2008? DYNAMIC x-drive: same ratios as above, but then power can be distributed 100% front to rear AND 100% left to right... meaning any one wheel can receive 100% power. did i get that right??? thanks. |
#9
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Now, since you want to be precise, the more important issue is that you used the word power in your summary. Power does not equal torque. Scott27's very detailed explanation used the technical term torque. Power is a function of torque and speed. In the Gen 1 and Gen 2 AWD systems, all of the power sent to a specific axle can go to the non-braked wheel, but that will equate to half the torque, in this idealized example.
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#10
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you maybe right on the "power' term... i'm not an engineer.... thanks for the clarification. |
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