Impacts of the exhaust gas recirculation (EGR) combined with the regeneration mode in a compression ignition diesel engine operating at cold conditions

Internal combustion engines working at cold conditions lead to the production of excessive pollutant emissions levels. The use exhaust gas recirculation could be necessary reduce nitrogen oxides emissions, even these conditions. This paper evaluates impact using high-pressure strategy while diesel particulate filter is under active regeneration mode on a Euro 6 turbocharged engine running low ambient temperature (?7°C). evaluated 40 h operation, 20 them two systems in combination. results show that activation during process leads 50% reduction with respect reference case without recirculation. Moreover, modification some parameters compared base calibration, as rate, main fuel injection timing and post quantity, allows optimize this by reducing carbon monoxide up 60%. Regarding hydrocarbons consumption, small advantage observed strategy. However, temperatures can produce fouling deposits condensation components (valve, cooler, intake manifold, etc.) contribute reach saturation filter. For reasons, efficiency followed experiments through status, concluding rates combination also clean soot particles These depositions are visualized presented end work brief analysis characteristics quantitative estimation total volume produced experimental campaign.