Paper Info
Title
Supervisory control for NO/sub x/ reduction of an HEV with a mixed-mode HCCI/CIDI engine
Abstract
Diesel HCCI (Homogenous Charge Compression Ignition) is a combustion technology showing great promise for the drastic reduction of oxides of nitrogen and particulate matter from diesel engines. Whereas conventional DI (Direct Injection) combustion burns primarily with a diffusion flame, HCCI combustion is a premixed combustion. This premixed reduction results in significantly lower NOx when compared to the DI counterpart. However, it is widely recognized that medium to high loads are not currently achievable with this combustion system. To circumvent this limitation, our implementation is a mixed-mode HCCI/DI combustion, which relies on the use of an essentially unmodified common-rail CIDI engine, coupled with a highly effective atomizer for external mixture formation. With this concept, the engine can operate in HCCI mode, HCCI/DI mixed mode, or DI mode depending on the load, and with seamless, progressive mode transition. The concept has demonstrated extremely low levels of nitrogen oxides (below 3ppm) and smoke (FSN < 0.03) and pure HCCI operation up to an IMEP of 4.7bar. These levels are an order of magnitude lower than for conventional diesel combustion. In this paper, we present a supervisory control strategy for a hybrid electric vehicle which best exploits the NO characteristics of such a mixed-combustion mode engine, while optimizing fuel economy and meeting driver's demand. This strategy is an extension of our Adaptive Equivalent Consumption Minimization Strategy (A-ECMS) control strategy, suitably modified to explicitly minimize NOx emissions. The HEV configuration, coupled to this control strategy, allows to very effectively manipulate the operating points of the engine to be primarily constrained in the HCCI regime, with very low NO, emissions. This results in dramatically reduced NO, emissions during actual driving conditions, while retaining the high fuel economy of CIDI engines and hybrids and maintaining the performance envelop of the vehicle. In summary, the control strategy automatically exploits the relatively small region of HCCI operation to minimize NOx emissions.
Year
DOI
Venue
2005
10.1109/ACC.2005.1470579
american control conference
Keywords
DocType
ISSN
nitrogen,supervisory control,combustion,no,ignition,n
Conference
0743-1619
Citations 
PageRank 
References 
7
3.63
1
Authors
5
Name
Order
Citations
PageRank
Cristian Musardo19013.46
benedetto staccia273.63
Shawn Midlam-Mohler3428.19
yann guezennec4104.73
Giorgio Rizzoni525856.95