Document ID: chunk:federal_register_of_legislation:F2021C01210:reg:5:p3
Version: federal_register_of_legislation:F2021C01210
Segment Type: reg
Provision Reference: reg 5 (pt 3/5)
Character Range: 117787–120574

correction factor must be such that
0.93 < < 1.07.
        If these limits are exceeded, the corrected value obtained shall be given and the test conditions (temperature and pressure) precisely stated in the test report.

-----------
    l/ The tests may be carried out in air-conditioned test rooms where the atmospheric conditions may be controlled.
    2/ In the case of engines fitted with automatic air temperature control, if the device is such that at full load at 25C no heated air is added, the test shall be carried out with the device fully closed. If the device is still operating at 25C then the test is made with the device-operating normally and the exponent of the temperature term in the correction factor shall be taken as zero (no temperature correction).

6.4.2. Diesel engines - Factor  :
        The power correction factor () for diesel engines at constant fuel rate is obtained by applying the formula:
where
f a is the atmospheric factor;
        f m is the characteristic parameter for each type of engine and adjustment.
        6.4.2.1. Atmospheric factor f a
        This factor indicates the effects of environmental conditions (pressure, temperature and humidity) on the air drawn in by the engine.
        The atmospheric factor formula differs according to the type of engine.
         1.      Naturally aspirated and mechanically supercharged engines.

6.4.2.1.2.  Turbocharged engines with or without cooling of inlet air

        6.4.2.2. Engine factor fm
        fm is a function of qc (fuel flow corrected) as follows:
fm = 0.036 qc - 1.14
where
 qc  = q/r
where
        "q" is the fuel flow in milligramme per cycle per litre of total swept volume (mg/(l.cycle)).
        "r" is the pressure ratio of compressor outlet and compressor inlet  (r = 1 for naturally aspirated engines)
        This formula is valid for a value interval of qc included between 40 mg/(l.cycle) and 65 mg/(l.cycle).
        For qc values lower than 40 mg/(l.cycle), a constant value of f m equal to 0.3 (f m = 0.3) will be taken.
        For qc values higher than 65 mg/(l.cycle), a constant value of
f m equal to 1.2 (f m = 1.2) will be taken (see the figure below):

6.4.2.3. Conditions to be complied with in the laboratory
        For a test to be valid, the correction factor d must be such that   0.9 <  < 1.1.
        If these limits are exceeded, the corrected value obtained shall be given and the test conditions (temperature and pressure) precisely stated in the test report.

  7.  TEST REPORT
        The test report shall contain the results and all the calculations required to find the net power, as listed in the appendix to this annex, together with the characteristics of the engine listed in annex 1 to this Regulation

  8.  MODIFICATION OF