KMS MP25(M)/MA25(M) manual Version 4.2
50
3.2.5 Function key F5
By clicking this function, correction tables are displayed that allow you to correlate
ignition/injection to certain sensor values.
Function key F11 switches between
injection correction charts and ignition
correction charts.
Coolant temperature correction:
These tables are used to enter figures that
indicate the relative richness or weakness
(over the entire injection diagram in % and/or
ms) at readings that are within the range of the
coolant temperature sensor. You can use the
diagram in, or the diagram in ms or even both at
the same time.
This enables cold start enrichment to be achieved and it can also be used as a safeguard against
overheating, by providing enrichment at unduly high coolant temperatures. Cold start enrichment is
essential at low engine temperatures, because the fuel condenses against the cold cylinder walls
and is forced out of the exhaust without having been burned. As a result, the mix becomes too
weak, so that the engine will hesitate. To compensate for the loss of fuel at low engine
temperatures, more fuel will have to be injected.
There is also an option to completely cut off the injection so no fuel will be injected. If you insert
exactly -100% in the water temp. correction fields, fuel will cut off.
In the ignition correction table you can enter percentages for more/less pre-ignition. This allows
improvement of cold starting abilities for example.
Air temperature correction:
Here figures can be entered that indicate the relative richness or weakness (over the entire
injection diagram in %) at readings that are within the range of the air temperature sensor.
As air density is dependent on temperature, the quantities of fuel to be injected will at low
temperatures be larger than at high temperatures. This table can also be used to offer protection
when the inlet temperature is excessively high, by providing extra enrichment.
In the ignition correction table you can enter percentages for more/less pre-ignition. For example,
this helps protect turbo engines from knocking when intake temperatures become too high.
Battery voltage correction:
The battery voltage correction is used to compensate for the opening loss time of an injector. The
opening loss time is dependent on the battery voltage and may vary from 1.8 ms at 8V to 0.4 ms at
16V. When battery voltage correction is not applied, the mix will weaken when the battery voltage
decreases, with the risk of engine damage. In this table this effect can be compensated for by
matching the injector opening time to the battery voltage. The correction values are indicated in
ms per injection. For instance, 0.68 ms will be added to the duration of injection when the battery
voltage is 12.6V. The table is suitable for injectors with a resistance of 12Ω to 15Ω.
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