<abstract xmlns="http://www.w3.org/1999/xhtml">

A single-cylinder test engine model was built by GT-Power software, and the effects of internal exhaust gas recirculation (i-EGR), external EGR (e-EGR), i-EGR/e-EGR coupling and the crank angle degree at which 50% of total heat loss has taken place (CA50) on combustion and emission characteristics of gasoline compression ignition at low-load condition were analysed. The results show that the ignition delay period with e-EGR was extended slightly with the increased EGR ratio, while that with i-EGR strategy first shortened and then extended, and that the optimised indicated thermal efficiency could be achieved using a small amount of i-EGR. With the same EGR ratio, nitrogen oxide (NO<italic>X</italic>) emission is more likely to be suppressed by i-EGR, while soot emission was more deteriorated, and the superior trade-off relationship between carbon monoxide (CO)/hydrocarbon (HC) emissions and NO<italic>X</italic> emission was attained by the combination of lower i-EGR ratios and CA50 closed to top dead centre. When using i-EGR/e-EGR coupling with total EGR ratio being fixed, the indicated thermal efficiency was decreased by increasing i-EGR ratio, while the lower NO<italic>X</italic>, CO and HC emissions could be realised, but only with the consequence that soot emission increased.
</abstract>

A single-cylinder test engine model was built by GT-Power software, and the effects of internal exhaust gas recirculation (i-EGR), external EGR (e-EGR), i-EGR/e-EGR coupling and the crank angle degree at which 50% of total heat loss has taken place (CA50) on combustion and emission characteristics of gasoline compression ignition at low-load condition were analysed. The results show that the ignition delay period with e-EGR was extended slightly with the increased EGR ratio, while that with i-EGR strategy first shortened and then extended, and that the optimised indicated thermal efficiency could be achieved using a small amount of i-EGR. With the same EGR ratio, nitrogen oxide (NOX) emission is more likely to be suppressed by i-EGR, while soot emission was more deteriorated, and the superior trade-off relationship between carbon monoxide (CO)/hydrocarbon (HC) emissions and NOX emission was attained by the combination of lower i-EGR ratios and CA50 closed to top dead centre. When using i-EGR/e-EGR coupling with total EGR ratio being fixed, the indicated thermal efficiency was decreased by increasing i-EGR ratio, while the lower NOX, CO and HC emissions could be realised, but only with the consequence that soot emission increased.

Effects of internal/external EGR and combustion phase on gasoline compression ignition at low-load condition

School of Transportation and Vehicle Engineering

Applied Mathematics and Nonlinear Sciences

This work is licensed under the Creative Commons Attribution 4.0 International License.

A single-cylinder test engine model was built by GT-Power software, and the effects of internal exhaust gas recirculation (i-EGR), external EGR (e-EGR),...

Effects of internal/external EGR and combustion phase on gasoline compression ignition at low-load condition

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

Palabras clave
gasoline compression ignition, internal EGR, external EGR, combustion phasing

© 2020 Jingyu Gong et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Effects of internal/external EGR and combustion phase on gasoline compression ignition at low-load condition

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

Palabras clavegasoline compression ignition, internal EGR, external EGR, combustion phasing

© 2020 Jingyu Gong et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Palabras clave
gasoline compression ignition, internal EGR, external EGR, combustion phasing