公开(公告)号：US11821381B2

公开(公告)日：2023-11-21

申请号：US17148750

申请日：2021-01-14

Applicant: ExxonMobil Technology and Engineering Company

Inventor： Randall N. Hoy ,  Jerry D. Foster, Jr. ,  Jormarie Bitar

IPC: F02D41/14 ,  F02D19/06 ,  F02D35/02

CPC classification number: F02D41/1498 ,  F02D19/0649 ,  F02D35/027

Abstract: A method of assigning an octane number to a sample fuel based on the knock intensities obtained from a plurality of reference fuels each having a different assigned octane number while operating an engine at an established compression ratio. The knock intensities obtained from the plurality of reference fuels are plotted relative to the assigned octane numbers of the fuels. A line is fit to the plotted knock intensities. The octane number for a sample fuel is assigned based on the knock intensity obtained for the sample fuel, the knock intensity obtained from a prototype fuel having an assigned octane number, and the fitted line. In embodiments, an R squared value is obtained for the fitted line and compared with a minimum acceptable R squared value and the fitted line is validated if the R squared value is at least the minimum acceptable R squared value.

公开(公告)号：US20220220915A1

公开(公告)日：2022-07-14

申请号：US17148750

申请日：2021-01-14

Applicant: ExxonMobil Technology and Engineering Company

Inventor： Randall N. Hoy ,  Jerry D. Foster ,  Jormarie Bitar

IPC: F02D41/14 ,  F02D35/02 ,  F02D19/06

Abstract: A method of assigning an octane number to a sample fuel based on the knock intensities obtained from a plurality of reference fuels each having a different assigned octane number while operating an engine at an established compression ratio. The knock intensities obtained from the plurality of reference fuels are plotted relative to the assigned octane numbers of the fuels. A line is fit to the plotted knock intensities. The octane number for a sample fuel is assigned based on the knock intensity obtained for the sample fuel, the knock intensity obtained from a prototype fuel having an assigned octane number, and the fitted line. In embodiments, an R squared value is obtained for the fitted line and compared with a minimum acceptable R squared value and the fitted line is validated if the R squared value is at least the minimum acceptable R squared value.