The technology also integrates functions of traction control systems, reducing throttle when
it detects wheel spin to make sure a driver's right foot can't get him or her into trouble.
Some models of this use a Torsen center limited slip differential, and open differentials in the front and back, but they do this trick where they use the ABS sensors to
detect wheel spin, and then apply brakes to the spinning wheel, forcing it traction to go to the other wheels.
Though it is said that drivers are extremely good in
detecting wheel spin, traction control is an electronic device that speeds up the process of reducing engine power.
In a few milliseconds after the system
detect wheel spin in the rear wheels, power is cut to nullify that spin.
Not exact matches
When it
detects side - slipping or
wheel spin, ASTC provides integrated control of brakes, engine torque (via the electronic throttle control), transmission and electronically controlled four -
wheel drive to improve vehicle stability.
If inappropriate
wheel spin is
detected, the system reduces power to the
wheel or
wheels affected, or applies the brakes as needed to improve traction and prevent vehicle instability.
The
spin is
detected by the center differential which will progressively lock and bias engine torque sending the excess torque to the rear
wheels thus inducing oversteer.
When the traction control computer (often incorporated into another control unit, such as the ABS module)
detects one or more driven
wheels spinning significantly faster than another, it invokes the ABS electronic control unit to apply brake friction to
wheels spinning with lessened traction.
By comparing the speed of the front
wheels to that of the rear
wheels, the computer is able to
detect the slightest
wheel spin.
In 1971, Buick introduced MaxTrac, which used an early computer system to
detect rear
wheel spin and modulate engine power to those
wheels to provide the most traction.
Cars such as the VW Golf Synchro, 4Motion and Audi A3, S3, TT as well as the Seat Leon (all of which share the same platform and engines) have engine torque sent to the rear
wheels only in case front
wheel spin is
detected.
The electronic differential, which is a function of the anti-lock brakes and works at speeds up to 50 mph,
detects and limits individual
wheel spin and then redistributes the torque to the side that needs it most, he said.
The manually locking rear differential from the earlier generations was replaced with a conventional open differential, with Electronic Differential Lock (EDL)(which
detects wheelspin via ABS road
wheel speed sensors, and applies brakes to one
spinning wheel, thus transferring torque via open differential to the opposite
wheel which has more traction).
The G70 2.0 T and 3.3 T models equipped with the Dynamic package are further enhanced by the inclusion of a mechanical limited slip differential that improves traction on corner exit by balancing torque distribution across the rear axle when
wheel spin is
detected.
Both the variants are available with BMW's all -
wheel drive xDrive system which provides better traction, stability and increases safety by
detecting when the tyres are about to lose traction and cutting power to the
spinning wheel.
A big advantage of Vauxhall's all -
wheel drive system is that
wheels don't have to
spin before the proper corrective measures are introduced.When the sensors
detect a critical situation, it only takes around 80 milliseconds — the blink of an eye — for the system to send the requiredpower distribution to the
wheels.
If it is
detected, traction control activates one or more brake calipers and reduces engine torque to slow the
spinning wheel so it can regain traction.