Development of fuel efficiency improvements for a single cylinder internal combustion engine. An investigation and implementation of five fuel efficiency improving technologies on an Eco Marathon engine.
Examensarbete för kandidatexamen
Maskinteknik 300 hp (civilingenjör)
This thesis describes the work of developing a technology demonstrating single cylinder engine for Chalmers Vera Team. The engine was to display five different technologies that could be of use to Chalmers Vera Team in the continued development of their fuel efficient engine. The first technology investigated was the use of ceramics and low-friction materials in the combustion chamber in order to reduce heat and friction losses and hence increase the thermal efficiency. Using the ideal thermodynamic Atkinson cycle was the second technology investigated as it has a higher thermal efficiency than a conventional Otto cycle engine and can be utilized by relatively small mechanical changes of the Chalmers Vera Team existing engine. Replacing the conventional electric spark plug with a laser ignition system to achieve a more efficient combustion and lower the engine heat losses were investigated as a third fuel efficient technology. The fourth technology was the use of variable compression in the combustion chamber to achieve an optimum compression ratio over the full speed operating range of the engine, in order to get a constant high thermal efficiency. Direct injection was investigated as a fifth technology and a possibly more fuel efficient method of fuel injection, specifically the air assisted direct injection system, as the Chalmers Vera Team is limited, by competition rules, to a low pressure fuel system. The different technologies were implemented into a complete technology demonstrating engine, where only the laser ignition never was actualised with a physical component. The different technologies never got tested on the engine due to lack of time, but they all showed potential to decrease the fuel consumption.
Teknisk mekanik , Hållbar utveckling , Farkostteknik , Strömningsmekanik och akustik , Keramteknik , Materialvetenskap , Bearbetnings-, yt- och fogningsteknik , Metallurgi och metalliska material , Transport , Applied Mechanics , Sustainable Development , Vehicle Engineering , Fluid Mechanics and Acoustics , Ceramics , Materials Science , Manufacturing, Surface and Joining Technology , Metallurgy and Metallic Materials , Transport