Traduction de «Gaz d'échappement dilués » (Français → Anglais) :

‘particulate pollutants’ means components of the exhaust gas which are removed from the diluted exhaust gas at a maximum temperature of 325 °K (52 °C) by means of the filters described in the test procedure for verifying average tailpipe emissions.

corrected concentration of NMHC in the diluted exhaust gas, expressed in ppm carbon equivalent,

where G EDFW ,i = instantaneous equivalent diluted exhaust mass flow rate (kg/s) G EXHW ,i = instantaneous exhaust mass flow rate (kg/s) q i = instantaneous dilution ratio G TOTW ,I = instantaneous diluted exhaust mass flow rate through dilution tunnel (kg/s) G DILW ,i = instantaneous dilution air mass flow rate (kg/s) f = data sampling rate (Hz) n = number of measurements (b) where M f = particulate mass sampled over the cycle (mg) r s = average sample ratio over the test cycle where where M SE = sampled exhaust mass over the cycle (kg) M EXHW = total exhaust mass flow over the cycle (kg) M SAM = mass of diluted exhaust gas passing the ...[+++]particulate collection filters (kg) M TOTW = mass of diluted exhaust gas passing the dilution tunnel (kg) NOTE: In case of the total sampling type system, M SAM and M TOTW are identical.

The following formulae shall be applied: where conc e,i = instantaneous concentration of the respective pollutant measured in the diluted exhaust gas (ppm) conc d = concentration of the respective pollutant measured in the dilution air (ppm) u = ratio between density of the exhaust component and density of diluted exhaust gas, as reported in Table 4, point 2.1.2.1 M TOTW,i = instantaneous mass of the diluted exhaust gas (section 2.2.1) (kg) M TOTW = total mass of diluted exhaust gas over the cycle (section 2.2.1) (kg) DF = dilution factor as determined in point 2.2.3.1.1.

2.2.1. Determination of the Diluted Exhaust Gas Flow PDP-CVS system The calculation of the mass flow over the cycle, if the temperature of the diluted exhaust is kept within ± 6 K over the cycle by using a heat exchanger, is as follows: M TOTW = 1,293 x V0 x NP x (pB - p1 ) x273 / (101,3 x T) where M TOTW = mass of the diluted exhaust gas on wet basis over the cycle V0 = volume of gas pumped per revolution under test conditions (m³/rev) NP = total revolutions of pump per test pB = atmospheric pressure in the test cell (kPa) p1 = pressure drop below atmospheric at the pump inlet (kPa) T = average temperature of the diluted exhaust gas at ...[+++]pump inlet over the cycle (K) If a system with flow compensation is used (i.e. without heat exchanger), the instantaneous mass emissions shall be calculated and integrated over the cycle.

Calculation of mass emission The mass of particulates M PT (g/test) shall be calculated by either of the following methods: (a) where M f = particulate mass sampled over the cycle (mg) MSAM = mass of diluted exhaust gas passing the particulate collection filters (kg) M EDFW = mass of equivalent diluted exhaust gas over the cycle (kg) The total mass of equivalent diluted exhaust gas mass over the cycle shall be determined as follows: