2.9.1. Symbols for test parameters
| Symbol | Unit | Term |
|---|---|---|
| AP | m2 | Cross sectional area of the isokinetic sampling probe |
| AT | m2 | Cross sectional area of the exhaust pipe |
| aver | Weighted average values for: | |
| m3/h | —volume flow | |
| kg/h | —mass flow | |
| CI | – | Carbon 1 equivalent hydrocarbon |
| conc | ppm Vol% | Concentration (with suffix of the component nominating) |
| concc | ppm Vol% | Background corrected concentration |
| concd | ppm Vol% | Concentration of dilution air |
| DF | – | Dilution factor |
| fa | – | Laboratory atmospheric factor |
| FFH | Fuel specific factor used for the calulations of wet concentrations from dry concentrations hydrogen to carbon ratio | |
| GAIRW | kg/h | Intake air mass flow rate on wet basis |
| GAIRD | kg/h | Intake air mass flow rate on dry basis |
| GDILW | kg/h | Dilution air mass flow rate on wet basis |
| GEDFW | kg/h | Equivalent diluted exhaust gas mass flow rate on wet basis |
| GEXHW | kg/h | Exhaust gas mass flow rate on wet basis |
| GFUEL | kg/h | Fuel mass flow rate |
| GTOTW | kg/h | Diluted exhaust gas mass flow rate on wet basis |
| HREF | g/kg | Reference value of absolute humidity 10.71 g/kg for calculation of NOX and particulate humidity correction factors |
| Ha | g/kg | Absolute humidity of the intake air |
| Hd | g/kg | Absolute humidity of the dilution air |
| i | – | Subscript denoting an individual mode |
| KH | – | Humidity correction factor for NOX |
| Kp | – | Humidity correction factor for particulate |
| KW,a | – | Dry to wet correction factor for the intake air |
| KW,d | – | Dry to wet correction factor for the dilution air |
| KW,e | – | Dry to wet correction factor for the diluted exhaust gas |
| KW,r | – | Dry to wet correction factor for the raw exhaust gas |
| L | % | Percent torque related to the maximum torque for the test speed |
| mass | g/h | Subscript denoting emissions mass flow rate |
| MDIL | kg | Mass of the dilution air sample passed through the particulate sampling filters |
| MSAM | kg | Mass of the diluted exhaust sample passed through the particulate sampling filters |
| Md | mg | Particulate sample mass of the dilution air collected |
| Mf | mg | Particulate sample mass collected |
| Pa | kPa | Saturation vapour pressure of the engine intake air (ISO 3046: Psy = PSY; test ambient) |
| PB | kPa | Total barometric pressure (ISO 3046: Px = PX Site ambient total pressure Py = PY Test ambient total pressure) |
| Pd | kPa | Saturation vapour pressure of the dilution air |
| Ps | kPa | Dry atmospheric pressure |
| P | kW | Power, brake uncorrected |
| PAE | kW | Declared total power absorbed by auxiliaries fitted for the test which are not required by paragraph 2.4 of this Annex |
| PM | kW | Maximum measured power at the test speed under test conditions (see Annex VI, Appendix 1) |
| Pm | kW | Power measured at the different test modes |
| 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 |
| S | kW | Dynamometer setting |
| Ta | K | Absolute temperature of the intake air |
| TD | K | Absolute dewpoint temperature |
| Tref | K | References temperature (of combustion air: 298 K) |
| VAIRD | m3/h | Intake air volume flow rate on dry basis |
| VAIRW | m3/h | Intake air volume flow rate on wet basis |
| VDIL | m3 | Volume of the dilution air sample passed through the particulate sample filters |
| VDILW | m3/h | Dilution air volume flow rate on wet basis |
| VEDFW | m3/h | Equivalent diluted exhaust gas volume flow rate on wet basis |
| VEXHD | m3/h | Exhaust gas volume flow rate on dry basis |
| VEXHW | m3/h | Exhaust gas volume flow rate on wet basis |
| VSAM | m3 | Volume of sample through particulate sampling filters |
| VTOTW | m3/h | Diluted exhaust gas volume flow rate on wet basis |
| WF | – | Weighting factor |
| WFE | – | Effective weighting factor |
