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Its an ECU/ECM controlled process to control a car during driving for better stability on road/track.In other word it prevent spin of wheel which is more slippery on track/road .the process is going on with help of torque distribution in wheels.Commonly its works with ABS. its all about vehicle stability and safety on road.
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Traction control helps limit tire slip in acceleration on slippery surfaces. In the past, drivers had to feather the gas pedal to prevent the drive wheels from spinning wildly on slippery pavement. Many of today's vehicles employ electronic controls to limit power delivery for the driver, eliminating wheel slip and helping the driver accelerate under control.
Powerful rear-drive cars from the sixties often had a primitive form of traction control called a limited slip rear differential. Sometimes referred to as Positraction, a limited-slip rear axle will mechanically transfer power to the rear wheel with the most traction, helping to reduce, but not eliminate wheel spin. While limited-slip rear axles are still in use in many front- and rear-drive vehicles today, the device can't completely eliminate wheel slip. Hence, a more sophisticated system was needed.
Enter electronic traction control. In modern vehicles, traction-control systems utilize the same wheel-speed sensors employed by the antilock braking system. These sensors measure differences in rotational speed to determine if the wheels that are receiving power have lost traction. When the traction-control system determines that one wheel is spinning more quickly than the others, it automatically "pumps" the brake to that wheel to reduce its speed and lessen wheel slip. In most cases, individual wheel braking is enough to control wheel slip. However, some traction-control systems also reduce engine power to the slipping wheels. On a few of these vehicles, drivers may sense pulsations of the gas pedal when the system is reducing engine power much like a brake pedal pulsates when the antilock braking system is working.
Many people mistakenly believe that traction control will prevent their vehicle from getting stuck in the snow. This couldn't be further from the truth. Traction control does not have the ability to increase traction; it just attempts to prevent a vehicle's wheels from spinning. For drivers who routinely drive in snowy and icy conditions, traction control, antilock brakes, and snow tires are must-have safety features.
The car 'senses' tire slippage. When you accelerate on ice, for example, your tires spin. I'm sure you've had this happen. Traction control compares the revolutions per second in the front tire to the revolutions per second of the back tire. Because only the front tires (in a front wheel drive) are connected to the powertrain, the computer can tell when the tires aren't getting traction. The car compensates by limiting the amount of gas that you can feed to the engine. By doing this, it allows the tire to stop spinning and more easily grip the road. There are other systems as well, 'traction control' covers quite a broad range. However, this is the most basic, and the cheapest. You will find it on many American made cars.
Traction control helps limit tire slip in acceleration on slippery surfaces.
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