公开(公告)号：US20170299568A1

公开(公告)日：2017-10-19

申请号：US15516099

申请日：2015-09-29

Applicant: Delphi International Operations Luxembourg S.A.R.L

Inventor： Thierry Cochet ,  Jean-Michel Bacq

IPC: G01N33/28 ,  F02D41/00 ,  F02D41/12 ,  F02D41/40

CPC classification number: G01N33/2829 ,  F02D19/0636 ,  F02D19/0649 ,  F02D41/0087 ,  F02D41/123 ,  F02D41/1497 ,  F02D41/401 ,  F02D2200/0612 ,  F02D2200/101 ,  Y02T10/36 ,  Y02T10/44

Abstract: A method of determining the cetane number of a fuel in an internal combustion engine comprising, during running of the engine, i) with respect to one cylinder, performing a routine including a series of injections such that for each injection a quantity of fuel is injected into the cylinder, and during the routine varying the angle at which the injections takes place with respect to crankshaft angle; ii) measuring engine speed at intervals during the series of injections and determining values for changes in engine speed consequent to the injections; iii) determining cetane number from a pre-stored relationship relating the cetane number to changes in engine speed consequent to changes in the test injection angle.