Component Structure Study of Mechanical Atkinson Cycle Engine for Enhanced Reliability

収　録: FWC2023-PPE-013 • FISITA World Congress 2023 • Propulsion, power & energy efficiency

要　旨: As the world moves toward a decarbonized society, the CO2 emitted by automobile engines must be drastically reduced. Various attempts have been made to reduce losses. We have studied a mechanical Atkinson cycle engine with a large expansion ratio to improve thermal efficiency. The mechanical Atkinson cycle engine has a different component structure from that of conventional engines, which makes the load direction more complicated and increases the weight of the components, resulting in a higher load on each component. By adjusting the structure, shape, and clearance of the connecting bridge and sliding parts, a mechanical Atkinson cycle engine capable of withstanding an engine speed of 6000 rpm could be realized. This paper describes the reliability of each part and the establishment of the entire structure.

栗山恭和 / Yasukazu Kuriyama

収　録: FWC2023-PPE-013 • FISITA World Congress 2023 • Propulsion, power & energy efficiency

要　旨: The ongoing efforts to reduce CO2 emissions from automotive engines have been significant, but there remains a need to enhance thermal efficiency further. A significant enhancement in thermal efficiency can be achieved by applying the Atkinson cycle. In this study, a compact and highly efficient Atkinson cycle is considered, and a new mechanism with two crankshafts is proposed. The prototype engine significantly reduced CO2 emissions (approximately 10.5%) while maintaining the same height, maximum torque, and output power as conventional engines.