11 Commissioning
102 PHLOX II Ignition Control System
11.7.2 External ignition timing offset
The external timing offset can be applied in 2 ways:
by an analog setpoint, using the 0-5V or 4-20mA analog input (for example a potenti-
ometer)
by a digital input used as tristate switch (3 positions: +, -, neutral)
Whatever the method used, the active external common ignition timing offset displayed in
Par. 3917 is added to the active common ignition base timing [Par. 3911-3913] to build the
common ignition timing [Par. 3910] limited in the range [-10; 90°] before TDC.
Analog external common ignition timing offset
To setup an analog common ignition timing offset (provided for example by a knock con-
trol unit), perform following configuration:
- Setup the sensor IgnitionTimingOffset [Par. 2900].
- Par. 5917 = 1
- Par. 5918 = 0
Digital external common ignition timing offset
To setup a digital common ignition timing offset, perform following configuration:
- Setup the switch functions SwitchIgnTimOffsInc [Par. 2811] and
SwitchIgnTimOffsDec [Par. 2812]. It is recommended to use a tristate switch
and only one digital input for this purpose
- Par. 5917 = 1
- Par. 5918 = 1
- Par. 1917 = minimal digital ignition timing offset
- Par. 1918 = maximal digital ignition timing offset
- Par. 1919 = ignition timing offset step for each Increase or Decrease impulse
The actual active digital ignition timing offset is stored in a non-volatile
memory after each modification and will be used as initial offset value after,
for example, a reset of the control unit.
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