Operation9308−1/A1
Winterthur Gas & Diesel Ltd.
4/ 10
3.2 In-cylinder Pressure Evaluation
The compression pressure cannot be measured directly because of combustion and
fuel injection that can occur before TDC.
In the ICC system, the compression pressure of each cycle is calculated using the
polynomial formula based on the position of the piston.
The peak firing pressure is the highest measured pressure value in the crank angle
range between start of injection and approximately 20°CA after TDC as shown in
Fig. 2.
Pressure at 0°CA
Peak Firing Pressure
Fig. 2: Cylinder Pressure Trace of a Two-stroke Engine
The pressure increase is the difference between the firing pressure and the
compression pressure (see Fig. 2). The ICC sets the pressure increase limit e.g. to
40 bar to prevent mechanical overload to the engine.
3.3 ICC - Installation and Control
The necessary firing pressure, derived from the shop test, is converted back (by a
reverse ISO correction) to site conditions at each actual operating point of the engine.
This ensures that the engine firing pressure is adjusted according to its design criteria
and the engine is not overloaded while the full potential is exploited.
Together with the ICC, there are temperature and pressure sensors (that are directly
connected to the WECS−9520) installed upstream of the turbocharger (TC)
compressor inlet and in the scavenge air receiver. This continuous real-time ambient
condition adaptation allows for the regional climate, daily variations and overall engine
performance.
Intelligent Combustion Control
2014
To Next Page
Loading...
Need help?
General
