Division 2.1.1

Variable-speed engines of category NRE with maximum net power ≥ 19 kW, variable-speed engines of category IWA with maximum net power ≥ 300 kW, variable-speed engines of category RLR and variable-speed engines of category NRG.

The control area (see Figure 5.1) is defined as follows:

upper torque limit

full load torque curve;

speed range

speed A to n _hi;

where:

speed A = n _lo + 0,15 × (n _hi – n _lo);

n _hi

high speed [see Article 1(12)];

n _lo

low speed [see Article 1(13)].

The following engine operating conditions shall be excluded from testing:

1. (a)

   points below 30 % of maximum torque;

2. (b)

   points below 30 % of maximum net power.

If the measured engine speed A is within ± 3 % of the engine speed declared by the manufacturer, the declared engine speeds shall be used. If the tolerance is exceeded for any of the test speeds, the measured engine speeds shall be used.

Intermediate test points within the control area shall be determined as follows:

• %torque = % of maximum torque;

• $\mathrm{\%speed}=\frac{\left(n-n_{\mathrm{idle}}\right)}{\left(n_{\mathrm{100\; \%}}-n_{\mathrm{idle}}\right)}\times 100$ ;

where: n_{100 %} is the 100 % speed for the corresponding test cycle.