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Diagnostics of abnormal combustion in a SI automotive engine using in-cylinder optical combustion sensor

The paper presents development of a research project oriented towards application of optical sensors and optical wave-guides for the investigation and diagnostics of the combustion process in the internal-combustion automotive engine. Applied measurement method assumes usage of photometric techniques, and in particular spectrophotometry of the flames existing in the combustion chamber. Emission signal during combustion is picked up by an optical sensor with direct access to the combustion chamber, then transmitted using two parallel fiber-optic bundles. The signal can be filtered with set of interference filters and finally it is converted using grating monochromator or photodetector. The main goal of the project is to develop a laboratory diagnostic system enabling on-line identification of the abnormal combustion phenomena like knocking or misfires (lack of combustion). Extracted synthetic quality indexes will be used in the improvement of combustion process and as a feedback signals in the engine control algorithms. The paper is illustrated with some results obtained during previous experiments.