Various alternative combustion processes to reduce particulate- and NOx-emissions of Diesel engines are being investigated. The aim is to avoid zones within the combustion chamber that are rich in fuel and at the same time have high temperatures. These goals can be reached by homogenizing cylinder charge and using high rates of exhaust gas recirculation .
These alternative combustion processes present a special challenge for the engine control with homogenization, self-ignition and high rates of exhaust gas recirculation. The control of the engine has to be timed to the cycle and has to rely on combustion-specific parameters. A number of different sensor types is analysed and evaluated with regards to their capability to record parameters relevant to the combustion.
Specifically the signals and analysis of following sensor types are compared and evaluated:
Piezoelectric, piezoresistive and optical pressure sensors, knock-sensors, surface temperature sensors, ionic current sensors and optical sensors (fiber optics).
Test engine is a AVL-single cylinder diesel research engine with 1.4 litre displacement and four-valve cylinder head that is specifically adapted for alternative combustion processes.
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