S163: All-wheel drive

[olivia_patelh]

Per the National Park Service's standards, my ML 320 cannot use the primitive road at Great Sand Unes National Monument since it is not a 4 x 4.

The real regulation was supplied by the Park Ranger in black and white. Since it cannot be converted to 2WD alone, it is considered AWD according to their definition.

We were told to vacate the campsite, and you actually believe these items can be recycled? I don't understand. The cashback percentage on my first card is much higher, and it's good for camping in the remote region. Keep in mind that we had already traversed all of the clearly marked danger zones and were standing at the very top of the accessible portion of the road. The danger is soft sand.

I had mistakenly thought this for a four-wheel-drive vehicle for the last eleven years. Am I mistaken?

[felix_okaforp]

There isn't a universally acknowledged definition that I could locate, but the consensus is that the distinction is:

Differential coupling, or t-case in our case, connects the front and back axles in all-wheel drive vehicles, while a transfer case divides torque between the axles in 4WD or 4x4, allowing for two-wheel drive, four-wheel drive, or even four-wheel drive low, a gear reduction in the transfer case, as seen in our MLs, to be selected.

In addition, the term "all-wheel drive" is often misleading because, in entry-level models, open differentials are the norm, thereby making it two-wheel drive with the wheels mounted on opposite axles.
If your vehicle doesn't have a locker or restricted slip system (TSS on our MLs), then it will only have one wheel drive.

[arjun_wilsonu]

In my opinion, the National Park Service made a slight error.

In terms of actual off-road capability, the W163 is among the finest all-wheel-drive vehicles ever made. The subject has a lot of literature.

The 'courseness' usually linked with the 4WD 'title' led to their marketing as an AWD. An opulent SUV is its intended purpose. It continues to turn all four wheels. Despite the usage of open differentials, engine torque can still be applied to any of the four wheels.

Instead of using differential locks, a 4WD system that uses traction control can distribute torque to all four wheels, making them work together in slipping, spinning, or bog situations.

When comparing off-road capabilities in extreme conditions, such as deep sand, to those of a 4WD with diff locks, certain limitations become apparent.An Electronic Traction System (4ETS) and a permanent all-wheel-drive (AWD) system are standard on the Mercedes-Benz ML320. It doesn't rely on cumbersome mechanical locking differentials but rather makes use of anti-lock brakes and braking systems to direct power to the wheels that have the highest traction.

[arjun_wilsonu]

And this provides more context.Even while the electronic 4ETS system isn't as forceful as mechanical locking differentials, the Mercedes ML320's independent suspension manages high speeds admirably, making it an ideal choice for flowing sand tracks. The ML's traction control, which stops the wheels from sliding, can become stuck in deep, difficult dunes, and momentum is key on loose sand.Analysis of Performance: Mercedes-ML320 (AWD + 4ETS) vs. Locked 4WDType of System: Central differential and open front and rear differentials for full-time all-wheel drive.Superb at handling sand on both flat beaches and tracks that are moving at a high speed. When equipped, the low-range transfer case gives decent control, while the independent suspension smooths out harsh washboards.Deep Sand's Limitations: The electronic traction control system can overheat or overuse the brakes in an attempt to transfer power to the tires with traction if you come to a stop in loose sand and the wheels lift off the ground.Distinctive locking rear wheelsType of System: Manually lockable front, rear, and center axles; available in part-time or full-time 4WD.In demanding settings (such as steep dune climbs, deep ruts, or tilted terrain), sand handling is unparalleled. When you lock your axles, all four wheels spin at the same rate, so you won't lose engine torque and end up "digging" your vehicle into the sand.

[norajimeneztr]

I went the other way on that road. Travel from Westcliffe via Medano Pass to Great Sand Dunes National Park.... Not many difficult brook crossings. Ending in deep sand, but otherwise unremarkable. Tire pressure is 18 psi. The NPS policy is irrefutable. The console's side should have a fake lever installed.

[norajimeneztr]

https://www.google.com/maps/dir/Westcli ... 875ad86531

[felix_okaforp]

A four-wheel-drive transfer case from a Daimler Chrysler Jeep might potentially work.

Yeah, 4ETS depends on wheelspin to function fundamentally, regardless matter how good it is. In most cases, trails are not conducive to wheel spin.

[norajimeneztr]

'Single spinner' and open differentials seem to be two separate things to some folks.

The torque applied to the driving wheels remains constant.

What occurs when one of those wheels rotates freely is the crucial and operating aspect. Because of the 4ETS, that won't happen.In a conventional (open) differential, torque is still sent to both wheels, but the magnitude of the torque is consistently balanced. 1 and 2
Allow me to explain it in detail:

The open differential distributes the torque from the engine in an even distribution to the two wheels that are being driven.
One catch is that you can only apply as much torque as the wheel that has the least traction.
The Effects of Slipping: A single wheel on ice with no traction can only manage zero foot-pounds of torque. As a result, even though the wheel with grip isn't moving, you're stuck since the differential restricts the torque of the other wheel to zero foot-pounds.