Operation
9308−1/A1
Winterthur Gas & Diesel Ltd.
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3. Function
The ICC system is an optional part of the WECS−9520, which adjusts the peak firing
pressure of the engine according to engine design criteria. The firing and the
compression pressure of all cylinders are balanced by modifying the injection timing
and exhaust valve timing within their permitted operation range. All modifications of
engine control parameters by the activated ICC are compliant with the vessel’s IMO
certificate.
When the ICC system is switched on, it limits the pressure rise of the engine as an
included safety functionality. This reduces excessive wear of engine components,
risks of overload and also avoids potential incorrect manual adjustments in case of
open-loop control.
3.1 Pressure Transducers
The precise and continuously measured in-cylinder pressure of all units forms the
basis of the ICC system.
The pressure transducers (Pressductor® technology, based on a magneto-elastic
measuring principle) are used to measure the in-cylinder pressure.
The transducers (see Fig. 1) are installed on the cylinder cover just below the
indicator cocks (one on each cylinder).
The transducers have a unique blow-through design. Usually before main engine
start, the indicator cocks are opened while slowly turning the engine. During that time,
all potential combustion residuals (especially from HFO usage) are blown out.
This cleaning function guarantees precise measurement data over long-term
operation and reduced maintenance effort.
1
1
3
4
2
Fig. 1: Pressure Transducer
1 Pressure transducer 3 Cable
2 Indicator valve 4 Adapter piece
Intelligent Combustion Control
2014
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