Fuel consumption assessment of a multi-mode low temperature combustion engine as range extender for an electric vehicle. (15th September 2017)

• Record Type: Journal Article
• Authors: Solouk, A.; Tripp, J.; Shakiba-Herfeh, M.; Shahbakhti, M.
• Is Part Of: Energy conversion and management. Volume 148(2017)
• Page Start: 1478
• Page End: 1496
• Publication Date: 2017-09-15
• Subjects: High efficiency engines -- LTC engines -- HCCI -- RCCI -- Range extender -- Electric vehicle; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2017.06.090
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: Investigates fuel consumption reduction of a multi-mode LTC-SI engine as a range extender. Designs energy management strategies for multi-mode LTC-SI engines as range extenders. Analyzes effects of NVH and exhaust gas temperature constraints on fuel saving potential of LTC-SI engines. Examines LTC-SI engine operating mode variations under different vehicle load conditions. Abstract: Low temperature combustion (LTC) engines, including homogeneous charge compression ignition (HCCI) and reactivity controlled compression ignition (RCCI), are promising to improve powertrain fuel consumption and reduce NO x and soot emissions by improving the in-cylinder combustion process. However, the narrow operating range of LTC engines limits the use of these engines in conventional powertrains. In range extenders, the engine is decoupled from the drivetrain, which allows the engine to operate in a limited operating range; thus, range extenders offer an ideal application for realizing the advantages of LTC engines. In this study, the optimum fuel consumption improvement of an experimentally developed 2-l multi-mode LTC-SI range extender is investigated in a light-duty battery electric vehicle (BEV) platform. In the optimization framework, the mode-switching fuel penalty, exhaust aftertreatment catalyst light-off temperature, and engine noise, vibration, harshness (NVH) are considered. The engine operation modes include HCCI, RCCI, and conventional spark ignition (SI). The simulation results show in the city driving cycle, the single-mode HCCI and RCCI range extenders offer 11.0% and 5.4% fuel consumption improvement, respectively over a single-mode SI range extender. These improvements increase to 12.1% and 9.1% in the highway driving cycles. In the multi-mode operation, up to 1.4% higher fuel economy is achieved over different driving cycles, compared to single-mode HCCI/RCCI operation. As the driving cycle average demanded power increases, the contribution of the RCCI mode predominates the HCCI mode.