DIN EN 15195:2015-02

This document has been prepared by Technical Committee CEN/TC 19 "Gaseous and liquid fuels, lubricants and related products of petroleum, synthetic and biological origin" (secretariat: NEN, Netherlands). The responsible national committee is NA 062-06-43 AA "Motorische Prüfung von flüssigen Kraftstoffen" ("Engine testing of liquid fuels") of the Fachausschuss Mineralöl- und Brennstoffnormung (Standardization Committee for petroleum, fuels, lubricants and related products) (FAM) at the Materials Testing Standards Committee (NMP) at DIN. This European Standard specifies a test method for the quantitative determination of ignition delay of middle distillate fuels intended for use in compression ignition engines. The method utilizes a constant volume combustion chamber designed for operation by compression ignition, and employing direct injection of fuel into compressed air that is controlled to a specified pressure and temperature. An equation is given to calculate the derived cetane number (DCN) from the ignition delay measurement. This European Standard is applicable to diesel fuels, including those containing up to 30 % (V/V) fatty acid methyl esters (FAME). The test method is also applicable to middle distillate fuels of non-petroleum origin, oilsands based fuels, blends of fuel containing biodiesel material, diesel fuel oils containing cetane number improver additives and low-sulfur diesel fuel oils. However, users applying this standard especially to unconventional distillate fuels are warned that the relationship between derived cetane number and combustion behaviour in real engines is not yet fully understood. The test method is also applicable to the quantitative determination of the ignition characteristics of FAME, especially the ignition delay. However, the correlation data available were inconclusive about the precision of the equation. Hence, the determination of derived cetane number for FAME fuel, also known as B100, has not been included in the precision statement in Clause 12. This European Standard covers the ignition delay range from 2,8 ms to 6,3 ms (71 DCN to 34 DCN). The combustion analyser can measure shorter or longer ignition delays, but precision is currently not known. For these shorter or longer ignition delays the correlation equation for DCN is given in Annex D.