Experimental Investigation of Engine Speed Transient Operation in a Light Duty RCCI Engine

Event
SAE 2014 World Congress & Exhibition
Authors Abstract
Content
Reactivity Controlled Compression Ignition (RCCI) is an engine combustion strategy that utilizes in-cylinder fuel blending to produce low NOx and PM emissions while maintaining high thermal efficiency. The current study investigates RCCI and conventional diesel combustion (CDC) operation in a light-duty multi-cylinder engine over transient operating conditions using a high-bandwidth, transient capable engine test cell. Transient RCCI and CDC combustion and emissions results are compared over an up-speed change from 1,000 to 2,000 rev/min. and a down-speed change from 2,000 to 1,000 rev/min. at a constant 2.0 bar BMEP load.
The engine experiments consisted of in-cylinder fuel blending with port fuel-injection (PFI) of gasoline and early-cycle, direct-injection (DI) of ultra-low sulfur diesel (ULSD) for the RCCI tests and the same ULSD for the CDC tests. At the selected engine load, a step speed change was commanded and both combustion modes were compared for performance and emissions using fast response HC, NO and PM instruments. Optimized intake conditions (i.e., intake pressure, temperature and exhaust gas recirculation (EGR)) were used to explore the robustness of RCCI using real-world operating conditions. It was found that the engine was able to operate in the RCCI combustion mode using production level engine hardware with significantly lower engine-out PM and NOx emissions than CDC over the specified transient engine operating conditions.
Meta TagsDetails
DOI
https://doi.org/10.4271/2014-01-1323
Pages
14
Citation
Hanson, R., and Reitz, R., "Experimental Investigation of Engine Speed Transient Operation in a Light Duty RCCI Engine," SAE Int. J. Engines 7(2):888-901, 2014, https://doi.org/10.4271/2014-01-1323.
Additional Details
Publisher
Published
Apr 1, 2014
Product Code
2014-01-1323
Content Type
Journal Article
Language
English