Effects of internal/external EGR and combustion phase on gasoline compression ignition at low-load condition
, , , , y | 08 abr 2021
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Publicado en línea: 08 abr 2021
Páginas: 411 - 426
Recibido: 20 dic 2020
Aceptado: 31 ene 2021
DOI: https://doi.org/10.2478/amns.2021.1.00033
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© 2020 Jingyu Gong et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
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Engine operation parameters
| Speed (rpm) | 1500 |
| IVO (°CA ATDC) | −377 |
| IVC (°CA ATDC) | −133 |
| EVO (°CA ATDC) | 125 |
| EVC (°CA ATDC) | Variable |
| P intake (MPa) | 0.15 |
| T intake (K) | 323 |
| Intake O2 concentration | 21% |
| Coolant temperature (°C) | 85 |
Verification of emission results
| NO |
13.76 | 11.12 |
| Soot | 0.005 | 0.055 |
| CO | 21.47 | 20.85 |
| HC | 7.87 | 3.96 |
Physical and chemical properties of the test fuel
| Fuel mass (mg/cycle) | 28 |
| Molecular formula | C8H18 |
| Density (kg/m3@20°C) | 740 |
| Lower heating valve (MJ/kg) | 44.3 |
| Research octane number | 92 |
| Self-ignition temperature (°C) | 420 |
| Heat of vaporisation (kJ/kg@20°C) | 308 |
| Critical temperature (K) | 500 |
| Absolute entropy (J/kgK@20°C) | 3704 |
Test points of three groups
| Control parameter | Group 1 | Group 2 | Group 3 |
|---|---|---|---|
| Injection timing (°CA ATDC) | −38~ −12 | −38~ −12 | −18 |
| i-EGR ratio | 0~ 50% | 0% | 5%, 10%, 15%, 20%, 25%, 30%, 35% |
| e-EGR ratio | 0% | 0~ 50% | 35%, 30%, 25%, 20%, 15%, 10%, 5% |
Engine and injector specifications
| Bore (mm) | 105 |
| Stroke (mm) | 125 |
| Displacement (L) | 1.08 |
| Geometric compression ratio | 16:1 |
| Connecting rod length (mm) | 210 |
| Squish height (mm) | 0.85 |
| Valves/cylinder | 4 |
| Swirl ratio | 1.5 |
| Number of holes | 8 |
| Hole diameter (mm) | 0.15 |
| Injection pressure (MPa) | 50 |
| Cone angle (°) | 150 |