Abstract The Magma engine concept is characterised by a high compression ratio, central injector combustion system employed in a downsized direct-injection gasoline engine. An advanced boosting system and Miller cycle intake-valve closing strategies are used to control combustion knock while maintaining specific performance. A key feature of the Magma concept is the use of high CR without compromise to mainstream full-load performance levels. This paper focuses on development of the Magma combustion system using a singlecylinder engine, including valve event, air motion and injection strategies. Key findings are that early intake-valve closing (EIVC) is effective both in mitigating knock and improving fuel consumption. A load equivalent to 23.6 bar brake mean effective pressure (BMEP) for a multi-cylinder engine has been achieved with a geometric compression ratio of 13:1. Comparison of drive-cycle predictions for the downsized Magma concept versus a contemporary baseline engine indicates fuel consumption savings over WLTC and FTP-75 of 12.5% and 16.4% respectively.
A Miller cycle engine without compromise – The Magma concept
2017-01-01
23 pages
Article/Chapter (Book)
Electronic Resource
English
A Miller Cycle Engine without Compromise - The Magma Concept
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