Fast Response Exhaust Gas Temperature Measurement in IC Engines 2006-01-1319
The harsh environment presented by engines, particularly in the exhaust systems, often necessitates the use of robust and therefore low bandwidth temperature sensors. Consequently, high frequencies are attenuated in the output. One technique for addressing this problem involves measuring the gas temperature using two sensors with different time-constants and mathematically reconstructing the true gas temperature from the resulting signals. Such a technique has been applied in gas turbine, rocket motor and combustion research.
A new reconstruction technique based on difference equations has been developed and its effectiveness proven theoretically. The algorithms have been successfully tested and proven on experimental data from a rig that produces cyclic temperature variations. These tests highlighted that the separation of the thermocouple junctions must be very small to ensure that both sensors are subjected to the same gas temperatures. Exhaust gas temperatures were recorded by an array of thermocouples during transient operation of a high performance two-stroke engine. The results show that the increase in bandwidth arising from the dual sensor technique allowed accurate measurement of exhaust gas temperature with relatively robust thermocouples. Finally, an array of very fine thermocouples (12.5 - 50 μm) was used to measure the in-cycle temperature variation in the exhaust.
Citation: Kee, R., Hung, P., Fleck, B., Irwin, G. et al., "Fast Response Exhaust Gas Temperature Measurement in IC Engines," SAE Technical Paper 2006-01-1319, 2006, https://doi.org/10.4271/2006-01-1319. Download Citation
Author(s):
Robert J. Kee, Peter Hung, Bryan Fleck, George Irwin, Robert Kenny, John Gaynor, Seán McLoone
Affiliated:
Virtual Engineering Centre, Queen's University Belfast
Pages: 14
Event:
SAE 2006 World Congress & Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
SAE 2006 Transactions Journal of Passenger Cars: Electronic and Electrical Systems-V115-7
Related Topics:
Gas turbines
Exhaust systems
Gases
Combustion and combustion processes
Two stroke engines
Sensors and actuators
Mathematical models
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