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Commission Delegated Regulation (EU) No 134/2014Dangos y teitl llawn

Commission Delegated Regulation (EU) No 134/2014 of 16 December 2013 supplementing Regulation (EU) No 168/2013 of the European Parliament and of the Council with regard to environmental and propulsion unit performance requirements and amending Annex V thereof (Text with EEA relevance)

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3. Power and torque correction factors
3.1.Definition of factors α1 and α2
3.1.1.α1 and α2 shall be factors by which the torque and power measured are to be multiplied in order to determine the torque and power of an engine, taking account of the efficiency of the transmission (factor α2) used during the tests and in order to bring them within the reference atmospheric conditions specified in point 3.2.1 (factor α1). The power correction formula is as follows:

Equation Ap2.2-1:

where:

P0

=

the corrected power (i.e. the power under the reference conditions at the end of the crankshaft);

α1

=

the correction factor for reference atmospheric conditions;

α2

=

the correction factor for the efficiency of the transmission;

P

=

the power measured (power observed).

3.2.Reference atmospheric conditions
3.2.1.Temperature: 298,2 K (25 °C)
3.2.2.Dry reference pressure (pso): 99 kPa (990 mbar)

Note: the dry reference pressure is based on a total pressure of 100 kPa and a water vapour pressure of 1 kPa.

3.2.3.Atmospheric test conditions
3.2.3.1.During the test, the atmospheric conditions shall lie within the following range:

283,2 K < T < 318,2 K

where T is test temperature (K).

3.3.Determination of the correction factor α1 8

Equation Ap2.2-2:

where:

T

=

the absolute temperature of the ingested air

ps

=

the dry atmospheric pressure in kilopascals (kPa), i.e. the total barometric pressure minus the water vapour pressure.

3.3.1.Equation Ap2.2-2 applies only if:

If the limit values are exceeded, the corrected value obtained shall be stated and the test conditions (temperature and pressure) stated exactly in the test report.

3.4.Determination of the correction factor for mechanical efficiency of the transmission α2

Where:

  • the measuring point is the output side of the crankshaft, this factor is equal to 1;

  • the measuring point is not the output side of the crankshaft, this factor is calculated using the formula:

Equation Ap2.2-2:

where nt is the efficiency of the transmission located between the crankshaft and the measuring point.

This transmission efficiency nt is determined from the product (multiplication) of efficiency nj of each of the components of the transmission:

Equation Ap2.2-3:

3.4.1.
Table Ap2.1-3

Efficiency nj of each of the components of the transmission

TypeEfficiency
Gear wheelSpur gear0,98
Helical gear0,97
Bevel gear0,96
ChainRoller0,95
Silent0,98
BeltCogged0,95
Vee0,94
Hydraulic coupling or convertorHydraulic coupling90,92
Hydraulic convertor90,92

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