Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:4:p24
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 4 (pt 24/42)
Character Range: 68234–72227

dilution air sample passed through the particulate sampling filters
Md         mg           Particulate sample mass of the dilution air collected
Mf         mg           Particulate sample mass collected
Mf,p       mg           Particulate sample mass collected on primary filter
Mf,b       mg           Particulate sample mass collected on back-up filter
MSAM                    Mass of the diluted exhaust sample passed through the particulate sampling filters
MSEC       kg           Mass of secondary dilution air
MTOTW      kg           Total CVS mass over the cycle on wet basis
MTOTW,i    kg           Instantaneous CVS mass on wet basis
N          %            Opacity
NP         —            Total revolutions of PDP over the cycle
NP,i       —            Revolutions of PDP during a time interval
n          min-1        Engine speed
np         s-1          PDP speed
nhi        min-1        High engine speed
nlo        min-1        Low engine speed
nref       min-1        Reference engine speed for ETC test
pa         kPa          Saturation vapour pressure of the engine intake air
pA         kPa          Absolute pressure
pB         kPa          Total atmospheric pressure
pd         kPa          Saturation vapour pressure of the dilution air
ps         kPa          Dry atmospheric pressure
p1         kPa          Pressure depression at pump inlet
P(a)       kW           Power absorbed by auxiliaries to be fitted for test
P(b)       kW           Power absorbed by auxiliaries to be removed for test
P(n)       kW           Net power non-corrected
P(m)       kW           Power measured on test bed
Ω          —            Bessel constant
Qs         m3/s         CVS volume flow rate
q          —            Dilution ratio
r          —            Ratio of cross sectional areas of isokinetic probe and exhaust pipe
Ra         %            Relative humidity of the intake air
Rd         %            Relative humidity of the dilution air
Rf         —            FID response factor
ρ          kg/m3        Density
S          kW           Dynamometer setting
Si         m-1          Instantaneous smoke value
Sλ                      λ-shift factor
T          K            Absolute temperature
Ta         K            Absolute temperature of the intake air
t          s            Measuring time
te         s            Electrical response time
tF         s            Filter response time for Bessel function
tp         s            Physical response time
Δt         s            Time interval between successive smoke data (= 1/sampling rate)
Δti        s            Time interval for instantaneous CFV flow
τ          %            Smoke transmittance
V0         m3/rev       PDP volume flow rate at actual conditions
W          —            Wobbe index
Wact       kWh          Actual cycle work of ETC
Wref       kWh          Reference cycle work of ETC
WF         —            Weighting factor
WFE        —            Effective weighting factor
X0         m3/rev       Calibration function of PDP volume flow rate
Yi         m-1          1 s Bessel averaged smoke value

2.32.2.                      Symbols for chemical components

              CH4 Methane
              C2H6 Ethane
              C2H5OH Ethanol
              C3H8 Propane
              CO Carbon monoxide
              DOP Di-octylphtalate
              CO2 Carbon dioxide
              HC Hydrocarbons
              NMHC Non-methane hydrocarbons
              NOx Oxides of nitrogen
              NO Nitric oxide
              NO2 Nitrogen dioxide
              PT Particulates.

2.32.3.                      Abbreviations

              CFV Critical flow venturi
              CLD Chemiluminescent detector
              ELR European load response test
              ESC European steady state cycle
              ETC European transient cycle
              FID Flame ionisation detector
              GC Gas chromatograph
              HCLD Heated chemiluminescent detector
              HFID Heated