The result shows that the mechanism has similar piston movement processes with conventional engines. This paper presents a theoretical study of the mechanism piston movement process, then a discussion about effects of the eccentric phase and bore-to-stroke ratio. Among numerous VCR mechanisms, one with eccentric sleeve should draw people's attention, because it could vary both compression ratio and expansion ratio simultaneously, and also bring excellent energy-saving performance with Atkinson effect, which make the mechanism a rather promising measure in fuel reduction. Carmakers have focused on an energy-saving measure called variable compression ratio (VCR) because it suits related technologies with high efficiency easily. In recent years, due to global energy crisis, many governments have reduced emission of carbon dioxide by regulations, which make improving efficiency of engines an important topic.
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