Journal
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING
Volume 220, Issue D12, Pages 1727-1735Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1243/09544070JAUTO279
Keywords
hybrid electric vehicle; planetary gear; parallel-series; optimal engine operation; system efficiency
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The planetary gear hybrid powertrain (PGHP) is considered as a prospective hybrid electric vehicle (HEV) configuration. However, the optimal control of the system remains controversial because the characteristics of this system are much more complicated than those of conventional systems. This paper presents a case study that reveals the ambiguity of the conventionally-defined optimal operation line. Instead of this engine optimal operation line, the system optimal operation point is suggested. This point is determined by considering the engine efficiency and the transmission efficiency simultaneously. With the system optimal operation point, the fuel economy estimate can be simulated. First, the vehicle cruising at constant velocities was simulated. Then, the vehicle was run at various standard emission test schedules and the mileages were estimated. In each case, the engine operation was analysed to comprehend the optimal operation of the PGHP system. Also, the improvements in fuel economy by optimal operation are presented.
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