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EDL = Using the ABS sensors in reverse, this systems detects wheelspin and uses the brakes to slow the spinning wheel. This system works up to 50mph.
ASR = Used on FWD cars. Cuts back engine power until traction is regained if wheel slippage exceeds the ability of the EDL to cope. Works over all speeds.
QTR = has no front to rear or side to side bias. Optimally, it sends 25% to each wheel. Up to 66% of the total power can be directed to one wheel. The center diff is a mechanical unit that does not require slippage to activate a clutch or viscous coupling. The front and rear diffs are open and rely on the EDL to re-distribute power from side to side.
ESP = Uses yaw sensors as well as steering angle sensors and speed sensors. Recognizes when the car is no longer traveling on its intended path when steering angle does not co-oincide with yaw sensors. Selectively brakes different wheels ( like a tank slowing its tracks on one side and speeding them up on the other to complete a turn ), and if this is not enough to bring the car back in line, power is reduced.
EBD = electronic brake-force distribution. The car does not have a preset bias from front to rear like most cars, but uses the ABS sensors to detect impending lock-up and regulate brake force seperately at each wheel. Keeps the car more stable if you have to brake and turn at the same time.
