DIGITAL ECU TUNER 3 – User Manual
Signals types
Depending on the kind of crankshaft / camshaft sensor, there are different kinds of signals sent from the sensors.
The simplest sensor is the variable reluctant sensor (VR sensor), which, based on the induction laws, generates
bipolar signal, which amplitude depends on the rotational speed of the crankshaft / camshaft. The signal has
approximately the shape of a sinusoid. With low engine rotation speed, the voltage amplitude is measured in
dozens mV and may reach a few dozen Volt with its high revolutions. Some of the car ECU interprets a signal for
the sensor as
single ended
, which means that one of the sensor’s poles is connected to the ground and the signal is
taken from the other one. The second approach is treating the signal form the sensor as a balanced one
(
differential)
and using both halves of the signal.
Another kind of sensors are optical/ Hall’s sensors. They require power supply and generate a rectangular, unipolar
signal.
Unipolar signal.
Bipolar signal
Information about the type of a signal is crucial for the correct
configuration of the device. For VR sensors, in
Setup/Ignition
Configuration
menu, choose the
Input Type:
VR Sensor adaptive
Threshold Ignition .
For optical/ Hall’s sensors choose
Hall Effect or
optical sensor.
Choosing an incorrect type of signal may cause an
incorrect functioning of the device (lack of engine speed, ignition
errors, etc.)
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