Evaluation of the Effect of EGR on Engine Knock 982479
The effect of external EGR on knock was evaluated using a CFR engine. Combustion pressure was sampled on a time basis. A band pass filter in the time domain was applied to the pressure cycles. Five knock indices were calculated for each combustion cycle.
The problem to quantify knock intensity was focused. At this extent measurements were carried out on standard isooctane-n-heptane blends in the test conditions used for the determination of the Motor Method Octane Number (MON). Knock intensity was varied acting on compression ratio.
For each index, the conditions of absence of knock were determined using motored cycles. The indices were compared and one of them, showing the lowest C.O.V., was selected for further measurements.
The effect of EGR on test fuels having different composition was evaluated varying the compression ratio, at fixed ignition timing. In this way, the same level of detonation, obtained in the absence of EGR, was realized with different amount of external EGR. Percent variation of compression ratio was used to compare the ability of fuels, having different octane number, to tolerate compression ratio increase in presence of EGR.
In particular the tests were carried out on a matrix of twelve fuels with three levels of EGR. The result show that with all tested fuels the percent increase of compression ratio is strongly dependent on EGR.
Citation: Diana, S., Giglio, V., Iorio, B., and Police, G., "Evaluation of the Effect of EGR on Engine Knock," SAE Technical Paper 982479, 1998, https://doi.org/10.4271/982479. Download Citation
Author(s):
S. Diana, V. Giglio, B. Iorio, G. Police
Affiliated:
Istituto Motori of National Research Council of Italy
Pages: 10
Event:
International Fall Fuels and Lubricants Meeting and Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
SI Engines: Combustion and Emission Formation-SP-1393
Related Topics:
Ignition timing
Knock
Exhaust gas recirculation (EGR)
Combustion and combustion processes
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