Abstract
A large fraction of diesel engine tailpipe NOx emissions are emitted before the aftertreatment components reach effective operating temperatures. As a result, it is essential to develop technologies to accelerate initial aftertreatment system warm-up. This study investigates the use of early exhaust valve opening (EEVO) and its combination with negative valve overlap to achieve internal exhaust gas recirculation (iEGR), for aftertreatment thermal management, both at steady state loaded idle operation and over a heavy-duty federal test procedure (HD-FTP) drive cycle. The results demonstrate that implementing EEVO with iEGR during steady state loaded idle conditions enables engine outlet temperatures above 400 °C, and when implemented over the HD-FTP, is expected to result in a 7.9% reduction in tailpipe-out NOx.
Original language | English (US) |
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Pages (from-to) | 758-773 |
Number of pages | 16 |
Journal | International Journal of Engine Research |
Volume | 19 |
Issue number | 7 |
DOIs | |
State | Published - Sep 1 2018 |
Externally published | Yes |
Keywords
- Aftertreatment thermal management
- drive cycle
- early exhaust valve opening
- heavy-duty federal test procedure
- internal exhaust gas recirculation
- negative valve overlap
- thermal management
- variable valve actuation
ASJC Scopus subject areas
- Automotive Engineering
- Aerospace Engineering
- Ocean Engineering
- Mechanical Engineering