Trigger Arming Voltage

Trigger Arming Threshold Voltage



This table is used to set the voltage threshold at which the ECU will start listening for the activation edge on the trigger signal. It is only active when the Trigger Sensor Type is set to Reluctor or Custom.

The values in this table are used in different ways depending on your configuration.

When the Trigger Sensor Type is set to Reluctor and the Trigger Edge is set to Falling, the trigger signal must rise above this table value in order for the ECU to consider the signal as valid. This prevents any noise from falsely creating a trigger event. The signal will be accepted and a valid trigger event will occur when the voltage drops through 0v. 

When the Trigger Sensor Type is set to Reluctor and the Trigger Edge is set to Rising, the ECU inverts this table internally and the trigger signal must fall below that value in order for the ECU to consider the signal as valid. This prevents any noise from falsely creating a trigger event. The signal will be accepted and a valid trigger event will occur when the voltage rises back through 0v. 

When the Trigger Sensor Type is set to Custom, and the Trigger Edge is set to Falling, the signal must rise above this table value in order for the ECU to consider the signal as valid. This prevents any noise from falsely creating a trigger event. The signal will be accepted when the voltage drops through the 'Trigger Activation Voltage' table value.

When the Trigger Sensor Type is set to Custom, and the Trigger Edge is set to Rising, the signal must fall below this table value in order for the ECU to consider the signal as valid. This prevents any noise from falsely creating a trigger event. The signal will be accepted when the voltage rises through the 'Trigger Activation Voltage' table value.

For Reluctor style sensors, this table is generally mapped against RPM as increased tooth speed will create a higher amplitude signal. The table value should be set slightly lower than the peak voltage seen on the Trigger input for best performance. Too high and the ecu will never detect a signal, too low and signal noise may cause false trigger events.

Waveform Processing Example

Reluctor sensor, Falling Edge triggered



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