DIGITAL ECU TUNER 3 – User Manual
Analog Inputs
Digital ECU Tuner has 4 analog inputs. All operate the voltage from 0 – 5V with 10 bit resolution. Voltages above
5V are interpreted as 5V, however, such high voltages should be avoided because they may damage the device in
bad conditions.
Caution!
All unused analog inputs should be connected to the ground!
Every analog input can be assigned as a modified signal, load or corrections. These assignments can vary
depending on the table, and also the analog signals can be used for different functions (for example as a modified
signal and load).
The output value of the modified analog signal for fuel table is calculated on the following basis:
Vout = (TableValue * Vstep + Vin + analogOutOffset) * correction1 * correction2
If Vout < Analog Out Min then Vout = Analog Out Min;
If Vout > Analog Out Max then Vout = Analog Out Max,
where,
Vout Output voltage (Analog Out 1)
Vin Input voltage (Analog In 1)
Vstep Modification step ( 0.019V, 0.098V, 0.0049V menu Analog Output Configuration)
TableValue Fuel table value
AnalogOutOffset Analog output offset (menu Analog Output Configuration)
Correction1 Proportional value from the first correctional table’s cell
Correction2 Proportional value from the second correctional table’s cell
Load
Load is used to determine the table’s column, where the value will be used (X axis). The example of the sensor,
which voltage (or frequency) can be used as load, are, for example: TPS (for NA engines only!) , MAP sensor,
MAF sensor, etc.
To obtain as many signal modifications as possible, the range of the input signal must be correctly configured
(Analog Inputs Configuration menu).The minimal and maximal value of the chosen analog input should be set for
the correct highest and lowest frequency value indicated by the sensor.
For example, if the MAP sensor gives 0.5 V at the 40kpa of absolute and 4.0 V at 200kpa, then parameters should
be set: 0.5V and 4.0V, respectively. This way, it will be possible to use all cells from the table. It is important,
however, not to use the signal from the TPS as load in the turbocharged cars, because the opening angle of the
throttle doesn't reflect the real load of such engine! In this case, signal from MAP or MAF sensor must be used.
Page 15
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