MoTeC Knock OKM - Manual (Page 21)

MoTeC Configuration 21
This is added to the value in Retard Limit for the Instantaneous term
trim.
Unit: Degrees
e.g.: Retard Limit = 10, Retard Limit Long Term = 6 and
current ignition timing = 25 degrees BTDC then the Knock Control
Function can retard to 25 – (10+6) = 9 degrees.
• When all parameter settings are completed, click ESC
• Click
Knock Table
to enter the Knock Table window
This table sets the Knock Target Threshold (or Knock Limit) for the
Knock Control function.
The ignition will not be retarded unless the measured knock value of
any of the cylinders exceeds the Knock Target Threshold value.
To determine Knock Target Threshold values, run the engine in a non
knocking condition with safe ignition timing. Operate the engine fully
loaded through all RPM levels and note the background noise levels
in the cylinders knock percentage channels.
The Knock Table is configured with RPM as X-axis. As a starting
point, values are to be entered at 5 to 10% above background noise
levels.
• When all Knock Table settings are completed, click ESC
• Click
Gain
to enter the Knock Gain Table
This table compensates any sensitivity difference of the sensor to
particular cylinders.
The Knock Gain table should be used in conjunction with the Knock
Offset table to level out any differences between the individual
cylinders.
Typical starting value: 1.00
Note: The values in this table must be non-zero to show any Knock
Percentage values.
• When all Gain settings are completed, click ESC
• Click
Offset
to enter the Knock Offset Table
This table compensates for any offset differences of the sensor to
particular cylinders.
The Knock Offset table should be used in conjunction with the Knock
Gain table to level out any differences between the individual
cylinders.
Typical starting value: 0