ForTwo L3-1.0L (2009)
different signal representation when the wheel is running to the left or right. This signal is read directly by the ESP control unit.
The width of the square wave pulse provides various additional information (e.g. direction of travel and installation position) and the distance between
the square wave pulses indicates the current wheel speed.
When the vehicle or the corresponding wheel is at a standstill, the rpm sensor transmits a standstill pulse every second.
The external magnetic field is produced by a multipole ring. This consists of an elastomer plastic containing metallic particles. These are aligned by a
special magnetization method so as to produce various magnets whose polarity at the circumference alternates from north to south.
Advantages compared with a passive (inductive) rpm sensor:
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Sensing of vehicle speed right down to standstill.
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Improvement in signal quality (digital signal).
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Signal largely insensitive to vibrations and temperature differences.
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Lower weight and smaller design than induction-type pulse generator.
