Enhanced Exhaust after-Treatment Warmup in a Heavy-Duty Diesel Engine System via Miller Cycle and Delayed Exhaust Valve Opening
نویسندگان
چکیده
The exhaust after-treatment (EAT) threshold temperature is a significant concern for highway vehicles to meet the strict emission norms. Particularly at cold engine start and low loads, EAT needs be improved above 250 °C reduce tailpipe rates. Conventional strategies such as electrical heating, throttling, or late fuel injection mostly need high penalty fast warmup. objective of this work demonstrate using numerical model that combination Miller cycle delayed valve opening (DEVO) can improve tradeoff between warmup consumption penalty. A relatively low-load working condition (1200 RPM speed 2.5 bar BMEP) maintained in diesel model. via retarded intake closure (RIVC) noticeably effective increasing (as 55 °C). However, it also dramatically reduces flow rate (over 30%) and, thus, ineffective rapid DEVO has potential enhance increased rate. considerably decreases brake thermal efficiency (BTE)—by up 5%—due pumping loss system. RIVC + combined technique elevate with consumption—up 10%—compared alone requires lower rise loss. method superior alone. Unlike alone, mode does not extreme use increase engine-out provides higher heat transfer rates (up 103%) system through technically more difficult implement compared other methods. maintain accelerated BTE keep levels during loads.
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ژورنال
عنوان ژورنال: Energies
سال: 2023
ISSN: ['1996-1073']
DOI: https://doi.org/10.3390/en16124542