Division 6.1: Laboratory test conditions - Commission Delegated Regulation (EU) 2017/654 of 19 December 2016 supplementing Regulation (EU) 2016/1628 of the European Parliament and of the Council with regard to technical and general requirements relating to emission limits and type-approval for internal combustion engines for non-road mobile machinery

The absolute temperature (T _a) of the engine air at the inlet to the engine expressed in Kelvin, and the dry atmospheric pressure (p _s), expressed in kPa shall be measured and the parameter f _a shall be determined in accordance with the following provisions and by means of equation (6-5) or (6-6). If the atmospheric pressure is measured in a duct, negligible pressure losses shall be ensured between the atmosphere and the measurement location, and changes in the duct's static pressure resulting from the flow shall be accounted for. In multi-cylinder engines having distinct groups of intake manifolds, such as in a ‘V’ engine configuration, the average temperature of the distinct groups shall be taken. The parameter fa shall be reported with the test results.

Naturally aspirated and mechanically supercharged engines:

f_{a} = (\frac{99}{p_{s}}) \times {(\frac{T_{a}}{298})}^{0,7}

(6-5)

Turbocharged engines with or without cooling of the intake air:

f_{a} = {(\frac{99}{p_{s}})}^{0,7} \times {(\frac{T_{a}}{298})}^{1,5}

(6-6)

Division 6.1 Laboratory test conditions