Download: Gasoline Engine: VCR engine interest variable compression ratio

Interests and benefits of variable compression engine

11 document pages .pdf in English.

Summary and introduction

Potential benefits of Variable Compression Ratio (VCR) are presented, based on an examination of the relationship between compression ratio, BMEP and spark advance at light load and full load. Alternative methods of implementation VCR are illustrated and critically examined. System control strategies are presented. Potential manufacturing constraints are identified and their influence on system configuration is examined. Fuel economy benefits can be achieved by other technologies such as cylinder deactivation, and the ability to operate. VCR is identified as the key enabling technology of such downsized engines.


Worldwide pressure to reduce automotive fuel consumption and CO2 emissions is leading to the introduction of various new technologies for the gasoline engine as it fights for market share with the diesel. So far, variable compression ratio (VCR) engines have reached the market, despite patents and experiment dating back over decades. VCR technology could provide the key to enable a high performance load.
This paper will be reviewed by VCR, the implications for volume manufacture and the strategy for VCR.
maximum benefit.

Read also:  Thesis on the wet combustion and performance by Rémi Guillet

- Introduction (in French) on VCR engines
- a video presentation of the MCE-5, variable compression ratio engine developed in France
- MCE5, VRC-i mounted on a Peugeot 407

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