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Usage of 2-Stroke Engines for Hybrid Vehicles

Journal Article
ISSN: 2640-642X, e-ISSN: 2640-6438
Published March 24, 2022 by SAE International in United States
Usage of 2-Stroke Engines for Hybrid Vehicles
Citation: Shah, R., Khan, M., and Mittal, V., "Usage of 2-Stroke Engines for Hybrid Vehicles," SAE J. STEEP 3(2):129-138, 2022,
Language: English


As the automotive industry moves toward electrification, battery costs and vehicle range are two large issues that will delay this movement. These issues can be partially resolved through the use of series-hybrid vehicles, which can replace a portion of the batteries with a small engine that serves to recharge the battery. Given the size, weight, and operational constraints of this engine, a 2-stroke engine makes sense. Indeed, 2-stroke engines are currently being used for a number of applications including consumer products, small ground vehicles, boats, and drones. The technology has significantly improved to allow for reduced emissions and increased efficiency, especially through the use of direct injection. This article discusses the state of technology for 2-stroke engines and its application in series-hybrid vehicles. In particular, the use of a 2-stroke engine as a range extender provides significant benefit in range and cost over fully electric vehicles. The study found that although there have been numerous gains in terms of efficiency and emissions, more advances are required prior to the widespread usage of 2-stroke engines as range extenders.