9 Commissioning
48
KRONOS 20
2.
Verify other important parameter settings for engine, mixer and gas data before start-
ing the engine.
3.
Start the engine with the pre-set parameters in open loop mode.
4.
Check the voltage signal of the lambda sensor after the start (2915
LamdaProbe
).
Voltage should have dropped below 1 Volt within 40 seconds (cold start test of sen-
sor).
5.
Calibration of Venturi efficiency (1424
VenturiEfficiency
):
Run the engine in a range of 50 – 100 % load and increase or reduce Venturi effi-
ciency until the voltage signal of the lambda sensor (2915
LambdaProbe
) is in a range
between 0.1 and 0.7 Volt (measured lambda is approx. 1).
6.
Calibration of lambda map for other operating points:
Change load in several steps between 0 and 100 % and set the respective map values
(for speed and intake manifold pressure) so that they result in a voltage signal of the
lambda sensor (2915
LambdaProbe
) between 0.1 and 0.7 V (measured lambda is
approx. 1). Repeat these settings for low and high idle speed.
7.
To achieve optimal starting behaviour, the respective map values for the motor start
range (pressure is 1 bar at low speed) are corrected in order to have the engine starting
correctly in all conditions. Please note that the neighbouring values must be adapted
accordingly.
8.
Now the effective lambda value at all loads is always approximately 1. Verify the set-
ting for several operating points.
Settings for closed loop:
1.
Check (1464
LambdaTrimValueLimit
) to adjust the control range. Start with
±
0.05.
2.
Enable the closed loop with (5400
ClosedOrOpenLoop
= 1).
3.
Operate the engine with varying loads and observe the exhaust gas values. Set (1471
LambdaProbeSetPoint
) for lambda fine tuning so as be within the required exhaust gas
value range.
4.
Check the measured value parameter (3664
LambdaTrimValue
) over the complete
load range. Note that this value is limited by (1464
LambdaTrimValueLimit
). To
achieve a sufficiently ample control range (1464
LambdaTrimValueLimit
) must be set
to a correspondingly high value. On the other hand, it should guaranteed that in case of
sensor failure the engine still runs within a safe range.
5.
To conclude, check the open loop settings once more.
Summary of Contents for E-LES 30
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