Iveco Daily. Manual - part 412
176
ELECTRIC/ELECTRONIC SYSTEM
D
AILY
Base - May 2004
A semiconductor layer, immersed in a magnetic field and
through which current flows, generates a potential difference
(called Hall voltage) at its ends.
If current intensity remains constant, the generated voltage
depends only on the magnetic field strength: periodical
variation of field strength is enough to obtain a modulated
electric signal.
The smooth portion of the phonic wheel (distributing shaft
pulley) covers, while moving, the sensor, thus blocking the
magnetic field with resulting low output signal.
On the contrary, the sensor generates a high signal next to
the openings and when a magnetic field is available.
Phase sensor signals are acquired, and the engine position is
recognized according to the sequence of the phonic wheel
notches.
The mounting function makes it possible to identify signal
errors and interferences (if any).
The resulting signal is supplied to the processor that controls
the injection system.
1. Phase identification holes
1. Distributing shaft pulley - 2. Sensor
PERSPECTIVE VIEW
1. Power supply positive - 2. Signal output - 3. Earth
1
3
2
Figure 188
Figure 189
0003320t
0003321t
Figure 190
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