Operation9308−1/A1
Winterthur Gas & Diesel Ltd.
6/ 10
4. Operation
4.1 Operation of ICC
In the WECS−9520 it is possible to set to on or off each individual sub-function of the
ICC system. The system adjusts the necessary average value of the firing pressure to
its site-corrected set-point value. This balances the firing pressure of all units and
balances the compression pressure.
When all sub-functions are set to off, the engine operates in a conventional open-loop
control mode.
The in-cylinder pressure balancing and the firing pressure control are enabled beyond
the operating range of the auxiliary blowers (the auxiliary blowers are switched off).
The balanced compression and firing pressures are obtained by individually adjusting
the exhaust valve timing and injection timing of each cylinder unit.
Pronounced differences of single unit values for exhaust valve operation and injection
timing compared to other units are already a hint for hardware issues of certain
cylinder units and should be further investigated.
4.2 ICC-EXV Card
This flexView card (see Fig. 5) shows the measured values of the compression
pressure for each cylinder together with the average value of compression pressure
for all cylinders. On the right-hand diagram, the exhaust valve closing offset values
and the average offset value are shown.
Fig. 5: FlexView ICC-EXV Card
2014
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