IP 567: Determination of derived cetane number (DCN) of middle distillate fuels - Fixed range injection period, constant volume combustion chamber method

Overview:

Scope

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 method is applicable to diesel fuels, including those containing FAME. The method is also applicable to middle distillate fuels of nonpetroleum origin, although users applying this standard are warned that the relationship between ignition characteristics and engine performance in unconventional fuels is not yet fully understood.

The standard covers the ignition delay range from 2,9 ms to 5,0 ms (60 DCN to 35 DCN).

NOTE For the purpose of this European Standard, the expression “

% (V/V)” is used to represent the volume fraction, and “% (m/m)” the mass fraction.