Journal article

The significance of octane numbers to drive cycle fuel efficiency

Zhenbiao Zhou, Tanmay Kar, Yi Yang, Michael Brear, Thomas G Leone, James E Anderson, Michael H Shelby, Eric Curtis, Joshua Lacey

FUEL | ELSEVIER SCI LTD | Published : 2021


Modern spark-ignition engines are knock-limited over a significant fraction of their operating map. The efficiency loss induced by knock mitigation depends on both the fuel octane quality and driving conditions. This paper quantifies the relevance of the Research Octane Number (RON) and Motor Octane Number (MON) to the knock-limited fuel efficiency losses (KLFEL) of a mid-size sports utility vehicle operated in several standard drive cycles. The Octane Index model, OI = (1-K)·RON + K·MON, is used with K as the weighting factor to evaluate the relative importance of RON and MON. The K-map recently obtained for a gasoline turbocharged direction-injection engine (Zhou et al., Fuel 290 (2021) 12..

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University of Melbourne Researchers


Funding Acknowledgements

This research was supported by the Ford Motor Company. The lead author also thanks the support from the Australian Automotive Engineering Graduate Program.