Winterthur, December 2019 – The innovative 6635A1 cylinder pressure sensor from Kistler marks a decisive step forward in improving the efficiency and life expectancy of large engines. This exceptionally rugged and accurate piezoelectric sensor with an integrated charge amplifier is the key to optimized engine operation with closed loop control.
Closed Loop Combustion Control (CLCC) is firmly established as a suitable method for increasing the efficiency and life expectancy of large engines such as those used to power ships. The sensors required for continuous measurements of cylinder pressure are exposed not only to high pressures and temperatures but also to severe mechanical shocks. In view of the trend towards higher mean effective pressures (MEP) in engines, the ruggedness of pressure sensors is becoming a critical factor. But there is a drawback here: making the sensor more rugged almost inevitably means that it will also be less accurate.
Developed in close collaboration with engine manufacturers, the new cylinder pressure sensor 6635A1 was designed for use in engines running at medium speeds. The new sensor from Kistler optimally combines maximized operational lifetime with the greatest possible accuracy thanks to a host of innovative features:
- PiezoStar crystal: Kistler grows its own piezoelectric crystals – up to five times more sensitive than quartz, they deliver excellent measurement stability and have minimal temperature dependance.
- Optimized diaphragm design: the new, patented shape of the sensor diaphragm minimizes the thermal shock error, ensuring very good measurement characteristics.
- Robust signal transmission: instead of a plug-in connector, a welded connection ensures reliable wear-free signal transmission – even in case of severe stresses induced by shocks or vibrations.