
14
Workshop Manual, TPD 1353E, Issue 3
207
Peregrine EDi and 1300 Series EDi
Potentiometers
A potentiometer is used to measure the position of a mechanical device - the throttle.
The speed control (page 206/A10) is connected to a potentiometer, changes in its position will cause a change
in the signal voltage of the potentiometer.
l
If the return voltage increases, the engine speed will increase.
l
If the return voltage decreases, the engine speed will decrease.
The signal from the speed control sensor does not assist with calculating engine speed, it only shows the
position of the speed control.
Hall-effect sensors
Hall-effect sensors are used to measure the speed and position of a rotating mechanical device. The camshaft
motion sensor (page 206/A2) is a Hall-effect sensor.
The sensor contains a magnet. When the magnetic field is cut, a digital voltage is generated by the sensor in
the form of a pulse.
The timing disc, fitted to the camshaft, has 24 vanes that cut through the magnetic field of the sensor. The
vanes are of equal width, except one, which is narrower. When this narrow vane cuts through the magnetic
field, it produces a pulse that is shorter (B1) in duration than those of the other vanes.
The engine control module uses the short pulse to calculate the position of the camshaft - 90° BTDC, and uses
all of the pulses to calculate and control engine speed.
W262
B
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Содержание 1300 EDi Series
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