Real-time monitoring of combustion instability in a homogeneous charge compression ignition (HCCI) engine using cycle-by-cycle exhaust temperature measurements

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Proceedings titleProceedings of the 2012 Fall Technical Conference of the ASME Internal Combustion Engine Division (ICEF2012)
ConferenceICEF2012: 2012 Fall Technical Conference of the ASME Internal Combustion Engine Division, September 23-26 2012, Vancouver, BC, Canada
Article numberICEF2012-92191
Pages657666; # of pages: 10
AbstractThis paper describes an experimental study concerning the feasibility of monitoring the combustion instability levels of an HCCI engine based upon cycle-by-cycle exhaust temperature measurements. The test engine was a single cylinder, four-stroke, variable compression ratio Cooperative Fuel Research (CFR) engine coupled to an eddy current dynamometer. A rugged exhaust temerature sensor equipped with special signal processing circuitry was installed near the engine exhaust port. Reference measurements were provided by a laboratory grade, water-cooled cylinder pressure transducer. The cylinder pressure measurements were used to calculate the Coefficient of Variation of Indicated Mean Effective Pressure (COV of IMEP) for each operating condition tested. Experiments with the HCCI engine confirmed that cycle-by-cycle variations in exhaust temperature were present, and were of sufficient magnitude to be captured for processing as high fidelity signal waveforms. There was a good correlation between the variability of the exhaust temperature signal and the COV of IMEP throughout the operating range that was evaluated. The correlation was particularly strong at the low levels of COV of IMEP (2-3%), where production engines would typically operate. A real-time combustion instability signal was obtained from cycle-by-cycle exhaust temperature measurements, and used to provide feedback to the fuel injection control system. Closed loop operation of the HCCI engine was achieved in which the engine was operated as lean as possible while maintaining the COV level at or near 2.5%.
Publication date
AffiliationNational Research Council Canada; Energy, Mining and Environment
Peer reviewedYes
NRC number53102
NPARC number21268446
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Record identifier5d9141ee-b2d3-4fa3-95b4-ebd8264614b5
Record created2013-07-19
Record modified2016-05-09
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