Effect of Standard Tuning Parameters on Mixture Homogeneity and Combustion Characteristics in a Hydrogen Direct Injection Engine 2023-01-0284
Dihydrogen, as a zero CO2 fuel, is a strong candidate for internal combustion engine to limit global warming. This study shows the impact of standard tuning parameters on mixture homogeneity and combustion characteristics. A 2.2L Diesel engine on which the head was reworked to allow side mounted direct injector and central mounted spark plug was selected. The discussed tests were made at low engine speed and partial load. A spark advance sweep at different air-fuel ratios (λ) was conducted. The exponential relation between λ and NOx emissions is highly marked and extremely low NOx emissions up to 1.7 g/kWh at minimum spark advance for maximum brake torque can be measured. A λ sweep was performed at different starts of injection (SOI). The results show that, depending on the engine speed, a later SOI might lead to lower NOx emissions. For a λ setpoint of 1.8, at 1500 rpm, late SOI leads to 30% higher NOx emissions where at 2500 rpm these emissions are 26% lower. This assessment is explained by the cycle-to-cycle variations. Finally, the second λ sweep, where the rail pressure (Prail) was varied, reveals that maximizing the Prail does not necessarily lower down NOx emissions. At 2500 rpm of engine speed, for richer mixtures than λ = 1.8, the higher Prail leads to higher NOx emissions. Having a lower Prail might lead to a slightly leaner mixture near the spark plug at spark timing. This effect extends the ignition delay thus lower the NOx emissions.
Citation: LOW-KAME, J., Oung, R., Meissonnier, G., Da Graca, M. et al., "Effect of Standard Tuning Parameters on Mixture Homogeneity and Combustion Characteristics in a Hydrogen Direct Injection Engine," SAE Technical Paper 2023-01-0284, 2023, https://doi.org/10.4271/2023-01-0284. Download Citation
Author(s):
Jean LOW-KAME, Richard Oung, Guillaume Meissonnier, Mathieu Da Graca, Laurent Doradoux, Fabrice Foucher
Affiliated:
Universite D'Orleans, BorgWarner
Pages: 11
Event:
WCX SAE World Congress Experience
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Combustion and combustion processes
Diesel / compression ignition engines
Air / fuel ratio
Ignition systems
Brake torque
Fuel injection
Engines
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