BMW X-Drive 4X4 System
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- Опубліковано 22 вер 2024
- BMW X-Drive 4X4 System
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The BMW all-wheel drive or 4X4 system, called X-Drive, ensures that the vehicle has the best traction all the time, improves agility and keeps you safely on lane.
When parking, the system reacts to the need for high manoeuvrability at low speed, by opening the clutch completely so the powertrain functions optimally. Acting virtually instantaneously and in a manner as to go virtually unnoticed by the vehicle's driver. X-Drive can direct up to 100% of drive forces to one axle and allow the driver to start up quickly, even on slippery surfaces or steep hills. X-Drive directs all power to the axles with the greatest wheel traction.
X-Drive is the all time, all-wheel drive or 4X4 system from BMW. Under normal circumstances, it distributes driver power between the front and rear axles in a nominal 45-55 ratio, and changes this figure depending on when the road surface or overall driving conditions change. X-Drive allows power to be split between the front and rear axles through use of a multiplate clutch located between the gearbox and the drive shaft. This setup allows X-Drive vehicles to split power in virtually any way it pleases. Torque can be transferred to the front wheels via electronically controlled multi plate clutch that is located in the transfer case. X-Drive does not have a center differential. Most of the time, the clutch is partially locked and power is transferred to both axles in proportion 45-55 front to rear. The power distribution can be altered to continuously variable levels from 50-50 to 0-100.
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Thank you Robert. I appreciate that and all we ask is that folks post and participate. Feel free to ask us any questions. Thank you.
Subaru is a fantastic car, but keep one thing in mind. Starting in 2012 was the first year that Subaru offered a CVT. No one knows how reliable they are until a few years have passed. The older Subaru automatics had ultimate reliability, but the CVTs is still to be seen. The forester is still old time automatic. The Outback is a CVT. Thanks for posting.
These videos are very well made and educational. Can not complain about free education myself.
You're assuming all those points. This video is just the engagement actuation for the X-Drive. Quattro is also a good system. Thanks for posting.
@roro560v8 Thanks so much. As always, all we ask is that you post and participate as much as possible. Thank you.
@k24hybrid Thank you. Stay tuned for How X-Drive Servo Motor works and How to remove the Servo Motor. All we ask is that you folks post and participate. Thank you.
as always best info. i can get from you guys...thanks
@1:22 front and rear axle are interchanged!
05 x3 3.0i, mine makes a grinding sound when I kill DSC and slide it in the rain or snow. However I'm not noticing any problems associated with awd failure. I don't want a car that I can't throw around the icy streets, and the x3 is incredible in heavy snow. Is there even anything wrong?
Sounds to me like a brake issue. Check my BMW Ebook here.
autodiagnosticsandpublishing.com
Thanks for the vid!.
keep it up
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Can it climb when only 1 wheel has traction? that is only quastion that bother me
From my understanding , the only way for a four wheel drive car to be able to get it's self out of a rut with one wheel on the ground; and three in the air is to have a locking differential front and rear .
Or front or rear ,would make sense to be able to lock all four wheels if needed .
But as far as I know a limited slip differential will get you out of a situation like that or a vehicle with a locking differential; which will allow the two wheels on that axle to spin at the same speed.
This can also be accomplished by the car applying the brakes to the wheel that is slipping and allowing the wheel that isn't to get the torque.
I am not sure if the x drive system does this, the only thing I gather from this video is that the servo motor controls a clutch pack.
Which can engage and disengage one of the drive shafts which sends torque to one of the differentials which increase or decreases torque to the other.
I'm not sure if the system uses the brakes along with splitting torque to counter wheel spin.
I would think it does but that wasn't explained in this video.
I have a 2007 BMW X5 and have been wondering the same thing.
dappa311 LOL I think no matter what 4x4 system you use, If you have only one wheel on the ground and three in the air your passengers better be buckled up.
This system seems very simple to understand compared to a’ opened differential, an lsd or a torsen diff.
So from what I see the rear axle is permanently connected to the engine while the front is partially connected through the clutch and it can vary the transmittable torque up to locking the the front as well. So basically it can do very well, but it depends on the electronic control to take the best decision. Locking the rear means when the rear has ice and the front has good grip, the power can go 100% to the front as well because it locks the front as well.
However, this doesn’t solve all issues. On the rear and front there are two open differentials. The problem with left and right wheels remains as in any other car. Only High performance models have an lsd at the rear or may be rwd only.
Similarly an audi uses a torsen central diff and two front/rear open diffs or an lsd(torsen as well I suppose) at the rear for high performance models or optional. The torsen is more limited as it can’t lock any axle but if you are already in motion this is not a problem.
No, you're forgetting that all cars today have traction control. So right or left wheel spins, brake caliper will clamp it to prevent slipping.
ADPTraining no, of course, but traction control is not that effective. A rear lsd or a torsen is much better. When cornering, TC makes you slower, while an lsd makes you faster, usually the option is only for sports cars.
@@ADPTraining Thanks for the reply to his question, I was wondering the same thing, however that was mentioned in the video.
I was wondering , spitting torque between axles is great but if you have wheel spin splitting torque doesn't really solve that problem.
But from your answer, I assume that the system applies the brakes as well in a slipping situation as far as traction control goes ;along with splitting torque to the front or rear drive shafts as needed.
By way of the computers inputs of wheel spin and the vehicles steering angle sensors.
It's this based on the ATC 300?
Yes.
Useful video, but the voice is a show stopper for me.
You had me at useful.
It's all in your mind man. Concentrate on the task at hand. Have you ever been with a not so cute girl that you don't like. Then, she wins the LOTO and all of a sudden, SHE'S Gorgeous. How did that happened? Your perception changed. My videos are like that girl... They could make you - or save you - a lot of money. When they do, you'll love them for what they are... Content machines made by yours truly FREE for the benefit of all. Thanks for sharing.
X-drive is a great system. I have yet to find a surface that it couldn't handle so long as the car body isn't sitting on snow.
Thanks for sharing. That's also been my experience.
ADPTraining What's the best system for snow and ice? Audi Quattro? Subaru Symmetrical? Acura SH-AWD?
It behaves like any other 4 wheel drive, but only faster.
This greate thing
So no center differential & torque split from either 0:100 to 50:50 front:rear and 45:55 default split.
Seems inferior to Quattro by sounds of it.
When there is no wheelspin or any under/oversteer occurring it's 60 rear 40 front by default
Trades46 it's superior to quattro in all ways. quattro can't lock 100 % xdrive can send 100 % of power to any axle. quattro center differential can do something like 75 % to 25%. it's just a torsen derived differential can't compare to xdrive transfer case in situation when one axle has 0 resistance. Audi in latest audi all road made something similar to xdrive. Many people find quattro differential beautiful mechanical but xdrive works with all car sensors and it's more capable as a center differential than the torsen.
i like your videos but the voice is too slow and iritant.....
Despite a crazy number of electronics and sensors, its still way far from half of what pajero can in field..
Thanks for sharing.
Hi, could you technically speaking describe how a Pajero is better ? I've an x5 but I'm considering switching back to a Japanese one for my next car.
Try quattro
Po
Po
Fake
The sevo has a plastic gear that breaks often from normal road driving .owning a BMW x series is like owning two BMWs. Axles fail prematurely, oil pan and transfer case leak, no to mention all the plastic parts made for German laws on recycling like the valve covers and expansion tanks that get brittle and crack prematurely because of the life span design before recycling is ten years, really a bad design flaw in all BMW models, I see them every day, made to recycle , sad.
Germán, US, Asian laws have nothing to do with it. It's about weight.
This Ebook with immediate email delivery explains it all.
www.autodiagnosticsandpublishing.com/Automotive_Diagnostic_Repair_Book_Catalog.htm
Awful narration
this is shity system. Belt to transfer torque and clutch. Do you realise how energy inefficient system that is? Also cluts plates follow it's own physics. They torque transfered in not lineary proportional to the clutch plate force, meaning that system lag's behing. When computer detect slipage it's then take few moments more that clutch acctualy transfer torque. Meaning this system allways lag behing real road conditions
The system responds in 0.1 seconds and the belt it's used only on X5, X3, X6 because of the distance between the shafts same as on Q7, Range rover etc. The system is similar to 100% lock that can't Quatro and 4matic can't achive. Computer is linked with all the sensors of the car and can do torque vectoring by braking individual wheels, it can deliver power diagonally.
you don't get my point. This is reactive system quattro is active system. Here tires has to slip before sensors can detect slipage and then it takes 100 milisecond before system corrects. Quattro has more than 40 years of experiences. there's just no comparison between audi and bmw 4wd.
b novak audi fan :). bmw has 36 years of awd. xdrive is proactive doesn't need wheel spin to react. Please study before showing biased opinions. start with awdwiki. audi system is old technology all things evolve. you just compare a 4 kg torsen center diff with a transfer case capable of splitting the power any way between rear and front. Both start 60% rear 40% front here audi copied bmw.
Learn how to spell dumbfuck