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The End of Compromise
Published in Patrick Hossay, Automotive Innovation, 2019
Defining an engine that can change its compression ratio mid-operation could end this compromise (Image 2.16). In addition, since the primary limitation to the usage of many alternative fuels is getting the compression ratio right, a variable CR could allow multiple fuel usage including everything from straight vegetable oil or diesel, to hydrogen and methane. With the capacity to offer fuel efficiency and still provide power when needed, a variable compression ratio (VCR) could also allow for more compelling forced induction and ‘extreme downsizing’ to very small, light, and powerful engines. But all this requires a mechanical configuration that can change an engine’s core operation without adding excessive complexity or weight. Conceptually, there are two approaches that could allow the CR to be changed: You can change the clearance volume, or you can change the piston travel.
Performance characteristics of CI engine using blends of waste cooking oil methyl ester, ethanol and diesel
Published in International Journal of Ambient Energy, 2020
S. Kathirvel, Apurba Layek, S. Muthuraman
The major objective of this work is to use WCOME with ethanol–diesel blends to a VCR engine to cater the idea of engine modification. Ethanol was considered along with variable compression ratio as ethanol has higher latent heat of vaporisation to overcome the heat generated by the variable compression ratio. The relevance of the present work can also be attributed to the current scenario in India wherein KFC (Kentucky Fried Chicken), the renowned multinational fast food company had executed an agreement to produce biodiesel from waste cooking oil. This work deals with the collection and purification of waste cooking oil, preparation of biodiesel with the novel idea of using CaO catalyst and the study of the engine behaviour in a variable compression ratio engine powered by the diesel–ethanol blended waste cooking oil.