40 CFR Appendix A to Subpart D of Part 90
Tables
June 9, 2020
Table 1—Symbols Used in Subpart D
Open Table
| Symbol | Term | Unit |
|---|---|---|
| CO | Carbon monoxide | |
| CO2 | Carbon dioxide | |
| NO | Nitric oxide | |
| NO2 | Nitrogen dioxide | |
| NOX | Oxides of nitrogen | |
| O2 | Oxygen | |
| conc | Concentration (ppm by volume) | ppm |
| f | Engine specific parameter considering atmospheric conditions | |
| FFCB | Fuel specific factor for the carbon balance calculation | |
| FFD | Fuel specific factor for exhaust flow calculation on dry basis | |
| FFH | Fuel specific factor representing the hydrogen to carbon ratio | |
| FFW | Fuel specific factor for exhaust flow calculation on wet basis | |
| GAIRW | Intake air mass flow rate on wet basis | kg/h |
| GAIRD | Intake air mass flow rate on dry basis | kg/h |
| GEXHW | Exhaust gas mass flow rate on wet basis | kg/h |
| GFuel | Fuel mass flow rate | kg/h |
| H | Absolute humidity (water content related to dry air) | gr/kg |
| i | Subscript denoting an individual mode | |
| KH | Humidity correction factor | |
| L | Percent torque related to maximum torque for the test mode | percent |
| mass | Pollutant mass flow | g/h |
| nd, i | Engine speed (average at the i'th mode during the cycle) | 1/min |
| Ps | Dry atmospheric pressure | kPa |
| Pd | Test ambient saturation vapor pressure at ambient temperature | kPa |
| P | Gross power output uncorrected | kW |
| PAUX | Declared total power absorbed by auxiliaries fitted for the test | kW |
| PM | Maximum power measured at the test speed under test conditions | kW |
| Pi | Pi = PM, i + PAUX, i | |
| PB | Total barometric pressure (average of the pre-test and post-test values) | kPa |
| Ra | Relative humidity of the ambient air | percent |
| T | Absolute temperature at air inlet | C |
| Tbe | Air temperature after the charge air cooler (if applicable) (average) | C |
| Tclout | Coolant temperature outlet (average) | C |
| TDd | Absolute dew point temperature | C |
| Td, i | Torque (average at the i'th mode during the cycle) | N-m |
| TSC | Temperature of the intercooled air | C |
| Tref | Reference temperature | C |
| VEXHD | Exhaust gas volume flow rate on dry basis | m3/h |
| VAIRW | Intake air volume flow rate on wet basis | m3/h |
| PB | Total barometric pressure | kPa |
| VEXHW | Exhaust gas volume flow rate on wet basis | m3/h |
| WF | Weighing factor | |
| WFE | Effective weighing factor |
Table 2—Measurement Calibration Accuracy and Frequency
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| No. | Item | Permissible deviation from reading* | Calibration frequency | |
|---|---|---|---|---|
| Non-idle | Idle | |||
| 1 | Engine speed | ±2 % | Same | Monthly or within one month prior to the certification test. |
| 2 | Torque | ±2 % | Monthly or within one month prior to the certification test. | |
| 3 | Fuel consumption | ±2 % | ±5% | Monthly or within one month prior to the certification test. |
| 4 | Air consumption | ±2 % | ±5% | As required. |
| 5 | Coolant temperature | ±2 °C | Same | As required. |
| 6 | Lubricant temperature | ±2 °C | Same | As required. |
| 7 | Exhaust back pressure | ±5 % | Same | As required. |
| 8 | Inlet depression | ±5 % | Same | As required. |
| 9 | Exhaust gas temperature | ±15 °C | Same | As required. |
| 10 | Air inlet temperature (combustion air) | ±2 °C | Same | As required. |
| 11 | Atmospheric pressure | ±0.5 % | Same | As required. |
| 12 | Humidity (combustion air) (relative) | ±3.0 % | Same | As required. |
| 13 | Fuel temperature | ±2 °C | Same | As required. |
| 14 | Temperature with regard to dilution system | ±2 °C | Same | As required. |
| 15 | Dilution air humidity | ±3 % absolute | Same | As required. |
| 16 | HC analyzer | ±2 %** | Same | Monthly or within one month prior to the certification test. |
| 17 | CO analyzer | ±2 %** | Same | Monthly or within one month prior to the certification test. |
| 18 | NOX analyzer | ±2 %** | Same | Monthly or within one month prior to the certification test. |
| 19 | NOX converter check | 90 % | Same | Monthly or within one month prior to the certification test. |
| 20 | CO2 analyzer | ±2 %** | Same | Monthly or within one month prior to the certification test. |
*All accuracy requirements pertain to the final recorded value which is inclusive of the data acquisition system.
**If reading is under 100 ppm then the accuracy shall be ±2 ppm.
Table 3—Test Fuel Specifications
Open Table
| Item | Property | Tolerances | Procedure (ASTM)1 |
|---|---|---|---|
| Sulfur, ppm max. | 339 | D 2622-92 | |
| Benzene, max. % | 1.5 | D 3606-92 | |
| RVP, psi | 8.7 | ±0.2 | D 5191-93a |
| Octane, R + M/2 | 87.3 | ±0.5 | D 2699-92 D 2700-92 |
| IBP, °C | 32.8 | ±11.0 | D 86-93 |
| 10 % point, °C | 53.3 | ±5.5 | D 86-93 |
| 50 % point, °C | 103.3 | ±5.5 | D 86-93 |
| 90 % point, °C | 165.6 | ±5.5 | D 86-93 |
| End Point, max. °C | 212.8 | D 86-93 | |
| Phosphorus, g/liter, max. | 0.02 | D 3231-89 | |
| Lead, g/liter, max. | 0.02 | ||
| Manganese, g/liter, max. | 0.004 | ||
| Aromatics, % | 32.0 | ±4.0 | D 1319-89 |
| Olefins, % | 9.2 | ±4.0 | D 1319-89 |
| Saturates, % | Remainder | D 1319-89 |
1All ASTM procedures in this table have been incorporated by reference. See §90.7.
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