Journal
ENERGY
Volume 230, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2021.120819
Keywords
Engine cold-start; Thermal management; Aftertreatment; Electrically heated catalyst; Catalyst light-off; Gaseous emissions
Categories
Funding
- Jaguar Land Rover
- University of Birmingham
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Electrically heated catalyst (EHC) is integrated with the exhaust aftertreatment system to reduce cold start emissions. Developing an energy-efficient heating strategy can significantly reduce the time required for catalysts to light-off and improve emission conversion efficiency. Combining electrical and fuel post-injection catalyst heating can benefit from quick catalyst light-off and higher heating efficiency, showing a significant improvement in emissions conversion performance.
Electrically heated catalyst (EHC) is integrated with the exhaust aftertreatment system to reduce cold start emissions. Implementation of this proposed emission control technology will also provide addition CO2 and fuel consumption benefits. Developing an energy-efficient heating strategy has shown a significant reduction in the time required for the catalysts to light-off from the cold-start. In this study, it was found for the first time that the novel pulsating heating strategy with the pulse width of 30 s compared with typical heating strategy improved the CO and THC emissions conversion efficiency up to 34% and 31%, respectively. In contrast, a further increase in the heating pulse leads to lower emissions' conversion performance due to extending heating off period and consequently leading to the catalyst's light-out. Furthermore, combined electrical and fuel post-injection catalyst heating can benefit from the EHC's quick catalyst light-off and higher heating efficiency of the fuel post-injection, which showed a significant improvement in the DOC's emissions conversion performance. This approach can result in higher catalyst heating efficiencies and lower THC emissions which can be critical to meet the emissions legislations. An increase in the DOC's outlet temperature can be also beneficial for downstream after treatment component heating, e.g. DPF regeneration. (C) 2021 Elsevier Ltd. All rights reserved.
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