Vacas, Juan Sebastian (2025) An Experimental Study of Two-Stroke Cyclic Variation and a Prototype Component Design for Controlled Auto Ignition. Masters thesis, University of Wales Trinity Saint David.
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Abstract
Given the current concern of global warming the automotive industry is under pressure to provide alternative powertrains to improve fuel efficiency and reduce the production of carbon dioxide and associated emissions. 2-stroke engines are known to provide considerable benefits in weight reduction and power density in comparison to their 4-stroke brethren. However, very poor cycle-to-cycle stability under low load and low RPM conditions has rendered them impossible to implement on a market wide basis because of the emissions problems inherent with poor cyclic stability. In the early 1990s Honda Motor Corporation [60-67] introduced the concept of Controlled Auto Ignition to address the poor cyclic stability conditions but cost and complexity of the technology and an industry preference for 4-stroke engines has limited its take up. This dissertation aims to improve the fundamental cycle-to-cycle understanding to help determine a practical way forward for the 2-stroke engine. The work will experimentally measure the cylinder pressure to a resolution of one crankshaft degree for hundreds of consecutive cycles on a contemporary 2-stroke engine under the sub optimal running conditions. This will provide data with a depth and detail not currently available to the author in the academic literature. In addition, the author will design and manufacture prototype exhaust restrictors and cast aluminium cylinder heads based on research, in particular that of Honda Motor Corporation. The author believes that the enhanced high-resolution cycle-to-cycle analysis will provide an insight not currently available in the literature. It will help optimise the prototype exhaust restrictors and cylinder heads and better determine the engine design requirements to make a 2-stroke engine, with its inherent advantages, acceptable across the complete load and RPM range.
| Item Type: | Thesis (Masters) |
|---|---|
| Subjects: | T Technology > TL Motor vehicles. Aeronautics. Astronautics |
| Divisions: | Theses and Dissertations > Masters Dissertations |
| Identification Number: | https://doi.org/10.82227/repository.uwtsd.ac.uk.00003981 |
| Depositing User: | Juan Vacas |
| Date Deposited: | 18 Nov 2025 11:09 |
| Last Modified: | 18 Nov 2025 11:10 |
| URI: | https://repository.uwtsd.ac.uk/id/eprint/3981 |
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