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Directive 2005/55/EC of the European Parliament and of the Council (repealed)Show full title
Directive 2005/55/EC of the European Parliament and of the Council of 28 September 2005 on the approximation of the laws of the Member States relating to the measures to be taken against the emission of gaseous and particulate pollutants from compression-ignition engines for use in vehicles, and the emission of gaseous pollutants from positive-ignition engines fuelled with natural gas or liquefied petroleum gas for use in vehicles (Text with EEA relevance) (repealed)
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- Revised 31/12/20130.45 MB
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Changes over time for: Division 3.9.
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3.9.Verification of the test runU.K.
3.9.1.Data shiftU.K.
To minimise the biasing effect of the time lag between the feedback and reference cycle values, the entire engine speed and torque feedback signal sequence may be advanced or delayed in time with respect to the reference speed and torque sequence. If the feedback signals are shifted, both speed and torque must be shifted the same amount in the same direction.
3.9.2.Calculation of the cycle workU.K.
The actual cycle work Wact (kWh) shall be calculated using each pair of engine feedback speed and torque values recorded. This shall be done after any feedback data shift has occurred, if this option is selected. The actual cycle work Wact is used for comparison to the reference cycle work Wref and for calculating the brake specific emissions (see Sections 4.4 and 5.2). The same methodology shall be used for integrating both reference and actual engine power. If values are to be determined between adjacent reference or adjacent measured values, linear interpolation shall be used.
In integrating the reference and actual cycle work, all negative torque values shall be set equal to zero and included. If integration is performed at a frequency of less than 5 Hertz, and if, during a given time segment, the torque value changes from positive to negative or negative to positive, the negative portion shall be computed and set equal to zero. The positive portion shall be included in the integrated value.
Wact shall be between - 15 % and + 5 % of Wref
3.9.3.Validation statistics of the test cycleU.K.
Linear regressions of the feedback values on the reference values shall be performed for speed, torque and power. This shall be done after any feedback data shift has occurred, if this option is selected. The method of least squares shall be used, with the best fit equation having the form:
where:
y
=
feedback (actual) value of speed (min-1), torque (Nm), or power (kW)
m
=
slope of the regression line
x
=
reference value of speed (min-1), torque (Nm), or power (kW)
b
=
y intercept of the regression line
The standard error of estimate (SE) of y on x and the coefficient of determination (r2) shall be calculated for each regression line.
It is recommended that this analysis be performed at 1 Hertz. All negative reference torque values and the associated feedback values shall be deleted from the calculation of cycle torque and power validation statistics. For a test to be considered valid, the criteria of Table 6 must be met.
Table 6
Regression line tolerances
| a Until 1 October 2005, the figures shown in brackets may be used for the type-approval testing of gas engines. The Commission shall report on the development of gas engine technology to confirm or modify the regression line tolerances applicable to gas engines given in this table. | |||
| Speed | Torque | Power | |
|---|---|---|---|
| Standard error of estimate (SE) of Y on X | Max 100 min–1 | Max 13 % (15 %)a of power map maximum engine torque | Max 8 % (15 %)a of power map maximum engine power |
| Slope of the regression line, m | 0,95 to 1,03 | 0,83–1,03 | 0,89–1,03 (0,83–1,03)a |
| Coefficient of determination, r2 | min 0,9700 (min 0,9500)a | min 0,8800 (min 0,7500)a | min 0,9100 (min 0,7500)a |
| Y intercept of the regression line, b | ± 50 min-1 | ± 20 Nm or ± 2 % (± 20 Nm or ± 3 %)a of max torque whichever is greater | ± 4 kW or ± 2 % (± 4 kW or ± 3 %)a of max power whichever is greater |
Point deletions from the regression analyses are permitted where noted in Table 7.
Table 7
Permitted point deletions from regression analysis
| Conditions | Points to be deleted |
|---|---|
| Full load and torque feedback < torque reference | Torque and/or power |
| No load, not an idle point, and torque feedback > torque reference | Torque and/or power |
| No load/closed throttle, idle point and speed > reference idle speed | Speed and/or power |
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