Knock Control
Knock Control is used to retard the ignition timing in the case that engine knock is detected by the sensors. By enabling short term retard, the knock is reduced, creating a safer system, and protecting the engine from potential damage and/or detonation. Long-term trim also ensures that in the case that the tune was incorrect, the long-term learning can implement a long-term retard where required, in order to further reduce knock.
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Knock Control Tab
Mode
Banked
select this option when more than one sensor is being used
Unbanked
Select this option for single sensors
Short Term Retard
This is the amount of short term retard that is applied when the Knock Detection has seen the Knock Signal exceed the Knock Threshold. (Default = 5º)
Short Term Decay Rate
This is the rate at which the short term retard will decay away. This is measured in Degrees per complete engine cycle. (Default = 0.5º/ECyc)
Hysteresis Time
Limits the number of retard actions for this amount of time, in order to avoid multiple retard actions for one event from compounding on each other.
Long Term Trim Tab
Enable Long Term Trim
Select this box to enable long term trim of Knock Control
Long Term Retard
This is the amount of long term retard that will be applied for each knock detection event that occurs in that particular cell.
Max Long Term Retard
The maximum amount that the long term can learn to retard.
Reset
Resets all values in the Long Term Trim tables to 0
Apply to base Table
Applies indicated values to the Base Table
Enable Long Term Ignition Restore
Select this box to enable long term Ignition Restore. The learned amount of ignition correction per cell will be reduced (by the "long term retard" value) each time the ECU samples that cell and no knock event is detected.
Long Term Restore Amount
This is the amount of ignition advance added to the long term table when there is no knock detected in that cell. It will continue adding if there is no knock up until the Max Restore value is reached
Restore Sample Rate
Controls the rate at which the long term can restore the learned amount of retard back to normal if there is no knock detected.
Max Restore
The maximum timing advance that can be applied to restore the long term trim table. Positive numbers are ignition advance and this means it can learn this amount of additional timing over the Ignition Base table.
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