Development of the New 2L Gasoline Turbo Engine with the world’s first VC-T(Variable Compression-Turbo)

Paper #:
  • 2018-01-0371

Published:
  • 2018-04-03
Abstract:
The new 2L Gasoline Turbo Engine was developped with the world’s first mass production VC-T(Variable Compression-Turbo) technology using muliti-link VCR (Variable Compression Ratio) mechanism. It is well known that increasing the compression ratio is to improve gasoline engine thermal efficiency. However, there has always been a compromise for engine designers because of the trade off between increasing the compression ratio and knocking. Nissan has been working on variable compression ratio technology for more than 20 years and has now successfully applied this technology to a mass production engine. This technology uses a multi-link mechanism to change the top and bottom dead center positions, thereby allowing the compression ratio to be continuously changed. The VC-T (Variable Compression-Turbo) engine with this technology can vary the compression ratio from 14:1 obtaining high thermal efficiency, to 8:1 delivering high torque with enjoyning strong synergy effect of turbocharging. Thus this engine can realize various characteristics intelligently and autonomously based on the driver’s demand. This paper describes an overview of this engine and details the VCR mechanism of working principle, purpose and characteristics, as well as key performance/ technologies which are generalted synergy effects by VCR, such as acceralation performance, fuel efficiency, NVH, and newly developing a combusion desgin,a fuel supply system and a turbocharger,etc.
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