Examples for the time history and the variances of test cell humidity are shown in the following figures (Figure 9 to Figure 11).
Based on these results the following requirements were drafted for the GTR:
The absolute humidity (Ha) of either the air in the test cell or the intake air of the engine shall be such that: 5.5 ≤ Ha ≤12.2 (g H2O/kg dry air),
Humidity shall be measured continuously at a minimum of 1 Hz.
Absolute humidity (Ha) shall be measurable to within ±1 g H2O/kg dry air.
Figure 9: Example for the time history of the test cell humidity over the class 3 WLTC
Figure 10: Examples for the time history of the test cell humidity over the class 3 WLTC
Figure 11: Test cell humidity variances during the tests
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