9 Commissioning
44
KRONOS 20
A) The desired lambda value must correspond roughly to the measured lambda
value
(calibration of 1424
VenturiEfficiency
)
Due to variations in the engine and the gas train the venturi suction pressure not always
generates the same gas flow in relation to air flow. The measured lambda value therefore
not always corresponds to the set lambda value, although the mixture in not too rich or too
lean for the engine. The adjustment should be carried out with an upper load point.
If
λ
mea
(measured value) =
λ
des
(3462
LambdaDesiredValue
)
,
(within
±
2 %), then continue with B)
If
λ
mea
<
λ
des
then:
1.
Increase
η
vent
(1424
VenturiEfficiency
) until
λ
mea
=
λ
des
or until the engine misfires or
the engine power drops.
2.
λ
mea
increases (engine runs on leaner mixture). Example: was
λ
mea
=1.70 and now
changes to
λ
mea
=1.75
3.
Change
λ
set
(7400-7599
LambdaMap
) in the respective load/speed point. Example:
was
λ
set
= 1.75 and is now changed to
λ
set
= 1.70
4.
Verify the lambda values
5.
If
λ
mea
<
λ
des
repeat steps 1 to 4
When
λ
mea
>
λ
des
then:
1.
Reduce
η
vent
(1424
VenturiEfficiency
) until
λ
mea
=
λ
des
or to the lower ignition limit.
Attention, danger of knocking!
2.
λ
mea
is reduced (engine runs on richer mixture). Example: was
λ
mea
=1.70 and now
changes to
λ
mea
=1.65
3.
Change
λ
set
(7400-7599
LambdaMap
) in the respective load/speed point. Example:
was
λ
set
=1.65 and now is changed to
λ
set
= 1.70
4.
Verify the lambda values
5.
If
λ
mea
>
λ
des
repeat steps 1 to 4
B) Measured gas flow must correspond roughly to calculated gas flow
(calibration of 9420 - 9483
VolEffMap
or
1412
VolEfficiencyConst
)
Depending on different engine settings and operational conditions, volumetric efficiency
and therefore the calculated mixture flow may vary. This may lead to a difference between
the effective and the calculated gas flow. There is a fixed relation between calculated mix-
ture flow and calculated gas flow. This relation is based on the gas data and the desired
lambda. The calibration is started with rated power and repeated at three other load points.
It is advisable to calibrate the map.
Summary of Contents for E-LES 30
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