The Wankel engine is an eccentric rotary internal combustion engine known for its
simplicity, compactness, reliability, and efficiency. However, issues related to
sealing, efficiency, and emissions have hindered its widespread use. Recent
advancements in sealing technology, novel designs, material coatings, and
alternative fuels have addressed some of these problems, leading to improvements
in Wankel engine performance. This study examines these advancements in Wankel
engine technology and proposes three potential applications for future
automotive use. The first application involves utilizing a Wankel engine with a
continuously variable transmission to replace the powertrain in conventional
vehicles. The second application suggests replacing the engine in a
series-parallel electric-hybrid architecture with a Wankel engine. Lastly, the
third application explores using a Wankel engine as a range extender for
electric vehicles. To evaluate the benefits in terms of fuel consumption for
different drive cycles, each of these applications was modeled using the Future
Automotive System Technology Simulator (FASTSim). The models were assessed with
both standard Wankel engines and those incorporating recent advancements. The
results indicate a potential reduction in fuel consumption when utilizing
improved Wankel engine designs compared to traditional piston-based engines.
However, it should be noted that these improved Wankel engines still face
significant challenges regarding hydrocarbon emissions. Furthermore, the study
identified a promising application for Wankel engines as range extenders in
electric vehicles, suggesting their potential to enhance the overall efficiency
of electric transportation.
