Four Wheel Drive

There are almost as many different types of four-wheel-drive systems as there are four-wheel-drive vehicles. It seems that every manufacturer has several different schemes for providing power to all of the wheels. The language used by the different carmakers can sometimes be a little confusing, so before we get started explaining how they work, let's clear up some terminology:

Four-wheel drive - Usually, when carmakers say that a car has four-wheel drive, they are referring to a part-time system. For reasons we'll explore later in this article, these systems are meant only for use in low-traction conditions, such as off-road or on snow or ice.
All-wheel drive - These systems are sometimes called full-time four-wheel drive. All-wheel-drive systems are designed to function on all types of surfaces, both on- and off-road, and most of them cannot be switched off.

Part-time and full-time four-wheel-drive systems can be evaluated using the same criteria. The best system will send exactly the right amount of torque to each wheel, which is the maximum torque that won't cause that tire to slip.

Torque, Traction and Wheel Slip
We need to know a little about torque, traction and wheel slip before we can understand the different four-wheel-drive systems found on cars.

Torque
Torque is the twisting force that the engine produces. The torque from the engine is what moves your car. The various gears in the transmission and differential multiply the torque and split it up between the wheels. More torque can be sent to the wheels in first gear than in fifth gear because first gear has a larger gear-ratio by which to multiply the torque.

This bar graph indicates the amount of torque that the engine is producing. The mark on the graph indicates the amount of torque that will cause wheel slip. The car that makes a good start never exceeds this torque, so the tires don't slip; the car that makes a bad start exceeds this torque, so the tires slip. As soon as they start to slip, the torque drops down to almost zero.

The interesting thing about torque is that in low-traction situations, the maximum amount of torque that can be created is determined by the amount of traction, not by the engine. Even if you have a NASCAR engine in your car, if the tires won't stick to the ground there is simply no way to harness that power.

Traction
For the sake of this article, we'll define traction as the maximum amount of force the tire can apply against the ground (or that the ground can apply against the tire -- they're the same thing). These are the factors that affect traction:

The weight on the tire - The more weight on a tire, the more traction it has. Weight can shift as a car drives. For instance, when a car makes a turn, weight shifts to the outside wheels. When it accelerates, weight shifts to the rear wheels.
The coefficient of friction - This factor relates the amount of friction force between two surfaces to the force holding the two surfaces together. In our case, it relates the amount of traction between the tires and the road to the weight resting on each tire. The coefficient of friction is mostly a function of the kind of tires on the vehicle and the type of surface the vehicle is driving on. For instance, a NASCAR tire has a very high coefficient of friction when it is driving on a dry, concrete track. That is one of the reasons why NASCAR race cars can corner at such high speeds. The coefficient of friction for that same tire in mud would be almost zero. By contrast, huge, knobby, off-road tires wouldn't have as high a coefficient of friction on a dry track, but in the mud, their coefficient of friction is extremely high.
Wheel slip - There are two kinds of contact that tires can make with the road: static and dynamic.
- static contact - The tire and the road (or ground) are not slipping relative to each other. The coefficient of friction for static contact is higher than for dynamic contact, so static contact provides better traction.
- dynamic contact - The tire is slipping relative to the road. The coefficient of friction for dynamic contact is lower, so you have less traction.

Why Does Wheel Slip Happen?
Quite simply, wheel slip occurs when the force applied to a tire exceeds the traction available to that tire. Force is applied to the tire in two ways:

Longitudinally - Longitudinal force comes from the torque applied to the tire by the engine or by the brakes. It tends to either accelerate or decelerate the car.
Laterally - Lateral force is created when the car drives around a curve. It takes force to make a car change direction -- ultimately, the tires and the ground provide lateral force.

Let's say you have a fairly powerful rear-wheel-drive car, and you are driving around a curve on a wet road. Your tires have plenty of traction to apply the lateral force needed to keep your car on the road as it goes around the curve. Let's say you floor the gas pedal in the middle of the turn (don't do this!) -- your engine sends a lot more torque to the wheels, producing a large amount of longitudinal force. If you add the longitudinal force (produced by the engine) and the lateral force created in the turn, and the sum exceeds the traction available, you just created wheel slip.

Most people don't even come close to exceeding the available traction on dry pavement, or even on flat, wet pavement. Four-wheel and all-wheel-drive systems are most useful in low-traction situations, such as in snow and on slippery hills.

Four-wheel Drive and Low Traction
The benefit of four-wheel drive is easy to understand: If you are driving four wheels instead of two, you've got the potential to double the amount of longitudinal force (the force that makes you go) that the tires apply to the ground.

This can help in a variety of situations. For instance:

In snow - It takes a lot of force to push a car through the snow. The amount of force available is limited by the available traction. Most two-wheel-drive cars can't move if there is more than a few inches of snow on the road, because in the snow, each tire has only a small amount of traction. A four-wheel-drive car can utilize the traction of all four tires.
Off road - In off-road conditions, it is fairly common for at least one set of tires to be in a low-traction situation, such as when crossing a stream or mud puddle. With four-wheel drive, the other set of tires still have traction, so they can pull you out.
Climbing slippery hills - This task requires a lot of traction. A four-wheel-drive car can utilize the traction of all four tires to pull the car up the hill.

There are also some situations in which four-wheel drive provides no advantage over two-wheel drive. Most notably, four-wheel-drive systems won't help you stop on slippery surfaces. It's all up to the brakes and the anti-lock braking system (ABS).

The Parts
The main parts of any four-wheel-drive system are the two differentials (front and rear) and the transfer case. In addition, part-time systems have locking hubs, and both types of systems may have advanced electronics that help them make even better use of the available traction.

Differentials
A car has two differentials, one located between the two front wheels and one between the two rear wheels. They send the torque from the driveshaft or transmission to the drive wheels. They also allow the left and right wheels to spin at different speeds when you go around a turn.

When you go around a turn, the inside wheels follow a different path than the outside wheels, and the front wheels follow a different path than the rear wheels, so each of the wheels is spinning at a different speed. The differentials enable the speed difference between the inside and outside wheels. (In all-wheel drive, the speed difference between the front and rear wheels is handled by the transfer case -- we'll discuss this next.)

The most common type of differential - the open differential

There are several different kinds of differentials used in cars and trucks. The types of differentials used can have a significant effect on how well the vehicle utilizes available traction.

The Transfer Case
This is the device that splits the power between the front and rear axles on a four-wheel-drive car.

A typical part time four-wheel drive transfer case. The planetary gear reduction can be engaged to provide the low-range gearing.

Back to our corner-turning example: While the differentials handle the speed difference between the inside and outside wheels, the transfer case in an all-wheel-drive system contains a device that allows for a speed difference between the front and rear wheels. This could be a viscous coupling, center differential or other type of gearset. These devices allow an all-wheel-drive system to function properly on any surface.

The transfer case on a part-time four-wheel-drive system locks the front-axle driveshaft to the rear-axle driveshaft, so the wheels are forced to spin at the same speed. This requires that the tires slip when the car goes around a turn. Part-time systems like this should only be used in low -traction situations in which it is relatively easy for the tires to slip. On dry concrete, it is not easy for the tires to slip, so the four-wheel drive should be disengaged in order to avoid jerky turns and extra wear on the tires and drivetrain.

Some transfer cases, more commonly those in part-time systems, also contain an additional set of gears that give the vehicle a low range. This extra gear ratio gives the vehicle extra torque and a super-slow output speed. In first gear in low range, the vehicle might have a top speed of about 5 mph (8 kph), but incredible torque is produced at the wheels. This allows drivers to slowly and smoothly creep up very steep hills.

Locking Hubs
Each wheel in a car is bolted to a hub. Part-time four-wheel-drive trucks usually have locking hubs on the front wheels. When four-wheel drive is not engaged, the locking hubs are used to disconnect the front wheels from the front differential, half-shafts (the shafts that connect the differential to the hub) and driveshaft. This allows the differential, half-shafts and driveshaft to stop spinning when the car is in two-wheel drive, saving wear and tear on those parts and improving fuel-economy.

Manual locking hubs used to be quite common. To engage four-wheel drive, the driver actually had to get out of the truck and turn a knob on the front wheels until the hubs locked. Newer systems have automatic locking hubs that engage when the driver switches into four-wheel drive. This type of system can usually be engaged while the vehicle is moving.

Whether manual or automatic, these systems generally use a sliding collar that locks the front half-shafts to the hub.

Advanced Electronics
On many modern four-wheel and all-wheel-drive vehicles, advanced electronics play a key role. Some cars use the ABS system to selectively apply the brakes to wheels that start to skid -- this is called brake-traction control.

Others have sophisticated, electronically-controlled clutches that can better control the torque transfer between wheels. We'll take a look at one such advanced system later in the article.

A Basic System
The type of part-time system typically found on four-wheel-drive pickups and older SUVs works like this: The vehicle is usually rear-wheel drive. The transmission hooks up directly to a transfer case. From there, one driveshaft turns the front axle, and another turns the rear axle.

Diagram of basic system

When four-wheel drive is engaged, the transfer case locks the front driveshaft to the rear driveshaft, so each axle receives half of the torque coming from the engine. At the same time, the front hubs lock.

The front and rear axles each have an open differential. Although this system provides much better traction than a two-wheel-drive vehicle, it has two main drawbacks. We've already discussed one of them: It cannot be used on-road because of the locked transfer case.

The second problem comes from the type of differentials used: An open differential splits the torque evenly between each of the two wheels it is connected to. If one of those two wheels comes off the ground, or is on a very slippery surface, the torque applied to that wheel drops to zero. Because the torque is split evenly, this means that the other wheel also receives zero torque. So even if the other wheel has plenty of traction, no torque is transferred to it. The animation below shows how a system like this reacts under various conditions.

Animation of a basic system encountering various combinations of terrain. This vehicle gets stuck when two of its wheels are on the ice.

Previously, we said that the best four-wheel-drive system will send exactly the right amount of torque to each wheel, the right amount being the maximum torque that won't cause that tire to slip. This system rates fairly poorly by that criterion. It sends to both wheels the amount of torque that won't cause the tire with the least traction to slip.

There are some ways to make improvements to a system like this. Replacing the open differential with a limited-slip rear differential is one of the most common ones -- this makes sure that both rear wheels are able to apply some torque no matter what. Another option is a locking differential, which locks the rear wheels together to ensure that each one has access to all of the torque coming into the axle, even if one wheel is off the ground -- this improves performance in off-road conditions.

The Ultimate System

The AM General Hummer military vehicle combines some advanced mechanical technology with sophisticated electronics to create what is arguably the best four-wheel-drive system available.

The Hummer has a full-time system with additional features that can be engaged for enhanced off-road performance. In this system, just as in our basic system, the transmission is hooked up to the transfer case. From the transfer case, one driveshaft connects to the front axle and one to the rear axle. However, the transfer case on the Hummer does not automatically lock the front and rear axles together. Instead, it contains a set of open-differential gears that can be locked by the driver. In open mode (not locked), the front and rear axles can move at different speeds, so the vehicle can drive on dry roads with no problem. When the differential is locked, the front and rear axles each have access to the engine's torque. If the front wheels are in quicksand, the rear wheels get all of the torque they can handle.

Diagram of Hummer system, one cool feature of the Hummer is the geared hubs it uses at each wheel. These raise the entire driveline, giving the Hummer 16 inches (40.64 cm) of ground clearance, more than double what most four-wheel drives have.

The front and rear differentials are both Torsen differentials. These differentials have a unique gearset: As soon as it senses a decrease in torque to one wheel (which occurs when a tire is about to slip), the gearset transfers torque to the other wheel. Torsen differentials can transfer from two to four times the torque from one wheel to the other. This is a big improvement over open differentials. But if one wheel is off the ground, the other wheel still gets no torque.

To handle this problem, the Hummer is equipped with a brake traction control system. When one tire starts to slip, the brake traction control applies the brakes to that wheel. This accomplishes two things:

It keeps that tire from slipping, allowing it to make maximum use of its available traction.
It allows the other wheel to apply more torque.

The brake traction control system applies significant torque to the wheel that wants to slip, allowing the Torsen differential to apply two to four times that increased torque to the other wheel.

Let's put the Hummer to the test.

Animation of a Hummer system encountering various combinations of terrain. For the Hummer to get stuck all four wheels would have to lose traction.

The system on the Hummer is capable of sending a large amount of torque to whichever tires have traction, even if this means sending it all to a single tire. This brings the Hummer pretty close to our definition of an ideal four-wheel-drive system: one that supplies each tire with the maximum amount of torque it can handle.