Rising highly concern about the environment has led to demands for the improvement of the efficiency of gasoline engines. Engine thermal efficiency will reach about 40% by technologies as boosted EGR, miller cycle and so on. This evolution trend will be continuously required to survive engines for the future. In this background, further improvement based on theoretical thermal efficiency of high compression ratio and specific heat capacity should be promoted. In addition, energy loss reduction such as represented by cooling loss and friction is also very important for the efficient and effective improvement. NISSAN’s challenges will be introduced to solve these propositions.
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MIZUNO, H., ASHIDA, K., TERAJI, A. et al. Transient analysis of the piston temperature with consideration of incylinder phenomena using engine measurement and heat transfer simulation coupled with three-dimensional combustion simulation. SAE Journal Article. 2009, 2009-01-0187.
MOTEKI, K., AOYAMA, S., USHIJIMA, K. et al. A study of a variable compression ratio system with a multi-link mechanism. SAE Technical Paper. 2003, 2003-01-0921.
TSUCHIDA, H., HIRAYA, K., TANAKA, D. et al. The effect of a longer stroke on improving fuel economy of a multiple-link VCR engine. SAE Technical Paper. 2007, 2007-01-4004.
Investigation on the response time of a self-regulation variable compression ratio engine Adrian Clenci, Vasile Hara, Nicolae-Doru Stănescu, Rodica Niculescu Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
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