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Traction control is part of a series of three braking
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Posted by Daren (more from Daren) on Sat, 28 Dec 2002 21:01:50 Share Post by Email
In Reply to: 93 9000 traction control, edg, Sat, 28 Dec 2002 18:46:54
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technolgies. Many euro vehicle manufacturers call traction control by its original: ASR traction control. ASR stands for "Acceleration Slip Regulation." In chronological order, these developments are: anti-lock brakes, aka ABS (1978), ASR traction control (1985), and stability control (1995). All three technologies come from Bosch Company in Germany, and all address the issue of improving contact (traction) between the car's tires and the road.

Traction control works at the opposite end of the scale from ABS -- dealing with acceleration rather than deceleration. Still, since many of the same principles apply to both systems, it might be best to visualize it as sort of ABS in reverse. ABS works by sensing slippage at the wheels during braking, and continually adjusting braking pressure to ensure maximum contact between the tires and the road. You can actually hear the system working (a grinding sound) and feel it (the pedal pulsing).

Traction control deals specifically with lateral (front-to-back) loss of friction during acceleration. In other words, when your car accelerates from a dead stop, or speeds up while passing another vehicle, traction control works to ensure maximum contact between the road surface and your tires, even under less-than-ideal road conditions.


ABS and traction control operate similarly. In fact, the ABS control unit is the basic "building block" for traction control and stability control. By adding modules and sensors, the system can be expanded to include these newer technologies.

In the case of traction control, the basic ABS system -- as well as other components in the vehicle -- requires some modification. To begin with, the old-style accelerator cable is typically replaced a sensor which converts the position of the accelerator pedal into an electrical signal, which the control unit uses to generate a control voltage.


Let's say you're at a stoplight on wet pavement. The light turns green and you press too firmly on the accelerator pedal. There is slick asphalt under your tires and the wheels begin to spin. The traction control system instantaneously kicks in, sensing that the wheels have begun to slip. Within a fraction of a second, this data is fed back to the control unit, which adjusts throttle input and applies braking force to slow the wheels (some older systems also retarded engine spark). The wheels are thus prevented from spinning and the car maintains maximum traction.

In other words, when speeding from a standing stop or while in motion, a driver may give too much accelerator input, causing the wheels to spin freely. In such cases, traction control monitors wheel speed, cuts engine power or even applies the brakes to optimize contact between the tires and the road surface.


The third "building block" in modern braking systems, stability control incorporates everything ABS and traction control do plus a yaw-sensing feature that works to increase traction during potential side-skidding situations. In other words, whereas both ABS and traction control work on the longitudinal (front-to-back) axis of the vehicle, stability control operates on the lateral (side-to-side) axis. Bosch's Electronic Stability Program (ESP), the first such system on the market, began appearing in 1995 Mercedes-Benz S-Class sedans. It has since become a popular feature on many upscale vehicles.

According to Bosch's Kosmider, "The platform for ABS, traction control and stability control is essentially the same. We simply add sensors to get the desired effect."


extrait de:

http://www.edmunds.com/ownership/safety/articles/46352/article.html







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