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Speed alert is based on transmission output shaft RPM and engine RPM. Older vehicles require magnets to be attached to the drive shaft where the rotation of the shaft causes an induction in a pick-up coil then the small voltage pulses are amplified. Newer vehicles have these sensors built-in to the wheels and are called VSS (Vehicle Speed Sensor). In both cases, the impulses are read then await calibration from the operator. For example, the driver accelerates to the the prefered speed, let's say 65 mph, then presses a button or adjusts a control so that the speed alert chimes. The preset speed is now stored. The next time the speed alert module reads the same parameters, VSS and engine RPM, it will alert the driver. There are also GPS based systems but they also require the VSS for accuracy.

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โˆ™ 2008-10-03 18:02:16
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Q: How does a speed alert chime work?
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