Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 183, Issue -, Pages 753-763Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2019.01.037
Keywords
SI engines; Variable compression ratio; Efficiency; VCR; Fuel efficiency
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Funding
- federal ministry of economics and technology of Germany
- National Council for Scientific and Technological Development-CNPq, Brazil
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Gasoline spark-ignited internal combustion engines for passenger cars are still a major part of the worldwide market share. With legislation pushing towards a lower carbon footprint, many technological alternatives are under scrutiny. Among them, one of the most promising is a variable compression ratio (VCR). This paper aims to experimentally prove the potential of this technology when applied to a state-of-the-art 3-cylinder, direct injection, turbocharged engine fuelled with regular RON 95 gasoline. A 2-stage variable compression ratio (VCR) system was applied to a series engine: The VCR prototype engine features compression ratio stages of 9.56:1 and 12.11:1. The engine has undergone only minor modifications, remaining substantially original. Dynamometer tests with in-cylinder pressure analysis were performed. The engine was tested over an operational map up to 4000 rpm and up to 26 bar BMEP, with stoichiometric operation and original ECU calibration. A fuel consumption reduction of up to 4% was found at part-load, where combustion phasing tended to be optimum. Penalties in fuel consumption at high loads were present due to knock-limited spark-timing. Results show that an even higher compression ratio variation range would further reduce of fuel consumption in both low and high load.
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