Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:13:p12
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 13 (pt 12/56)
Character Range: 327229–331246

intercept of the regression line, a0      maximum 10 per cent of idle speed         ±20 Nm or 2 per cent of maximum torque whichever is greater  ±4 kW or 2 per cent of maximum power whichever is greater

       Table 3
       Regression line tolerances for the WHSC
                                            Speed                                     Torque                                                        Power
Standard error of estimate (SEE) of y on x  maximum 1 per cent of maximum test speed  maximum 2 per cent of maximum engine torque                   maximum 2 per cent of maximum engine power

Slope of the regression line, a1            0.99 to 1.01                              0.98 - 1.02                                                   0.98 - 1.02

Coefficient of determination, r²            minimum 0.990                             minimum 0.950                                                 minimum 0.950

y intercept of the regression line, a0      maximum 1 per cent of maximum test speed  ±20 Nm or 2 per cent of maximum torque whichever is greater  ±4  kW or 2 per cent of maximum power whichever is greater

 For regression purposes only, point omissions are permitted where noted in Table 4 before doing the regression calculation. However, those points shall not be omitted for the calculation of cycle work and emissions. Point omission may be applied to the whole or to any part of the cycle.
       Table 4
       Permitted point omissions from regression analysis
Event                                     Conditions                                                            Permitted point omissions
Minimum operator demand (idle point)      nref = 0 per cent                                                     speed and power
                                          and
                                          Mref = 0 per cent
                                          and
                                          Mact > (Mref - 0.02 Mmax. mapped torque)
                                          and
                                          Mact < (Mref + 0.02 Mmax. mapped torque)
Minimum operator demand (motoring point)  Mref < 0 per cent                                                     power and torque
Minimum operator demand                   nact ≤ 1.02 nref and Mact > Mref                                      power and either torque or speed
                                          or
                                          nact > nref and Mact ≤ Mref'
                                          or
                                          nact > 1.02 nref and Mref < Mact ≤ (Mref +
                                          0.02 Mmax. mapped torque)
Maximum operator demand                   nact < nref and Mact ≥ Mref                                           power and either torque or speed
                                          or
                                          nact ≥ 0.98 nref and Mact < Mref
                                          or
                                          nact < 0.98 nref and Mref > Mact ≥ (Mref - 0.02 Mmax. mapped torque)

8. Emission calculation

 The final test result shall be rounded in one step to the number of places to the right of the decimal point indicated by the applicable emission standard plus one additional significant figure, in accordance with ASTM E 29-06B. No rounding of intermediate values leading to the final break-specific emission result is permitted.
              Calculation of hydrocarbons and/or non-methane hydrocarbons is based on the following molar carbon/hydrogen/oxygen ratios (C/H/O) of the fuel:

              CH1.86O0.006 for diesel (B7),
              CH2.92O0.46 for ethanol for dedicated C.I. engines (ED95),
              CH1.93O0.032  for petrol (E10),
              CH2.74O0.385 for ethanol (E85),
              CH2.525 for LPG (liquefied petroleum gas),

CH4 for NG (natural gas) and biomethane.

 Examples of the calculation procedures