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Demonstrating the Performance and Emission Characteristics of a Variable Compression Ratio, Alvar- Cycle Engine
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Abstract
This paper is a direct continuation of a previous study that addressed the performance and design of a variable compression engine, the Alvar-Cycle Engine [1]. The earlier study was presented at the SAE International Conference and Exposition in Detroit during February 23-26, 1998 as SAE paper 981027. In the present paper test results from a single cylinder prototype are reviewed and compared with a similar conventional engine. Efficiency and emissions are shown as function of speed, load, and compression ratio. The influence of residual gas on knock characteristics is shown. The potential for high power density through heavy supercharging is analyzed.
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Erlandsson, O., Lundholm, G., Söderberg, F., Johansson, B. et al., "Demonstrating the Performance and Emission Characteristics of a Variable Compression Ratio, Alvar- Cycle Engine," SAE Technical Paper 982682, 1998, https://doi.org/10.4271/982682.Also In
References
- Wong V. W. Stewart M. Lundholm G. Höglund A. “Increased Power Density via Variable Compression/Displacement And Turbocharging Using The Alvar-Cycle Engine” SAE 981027
- Stewart M. “Design and Analysis of a Variable-Compression-Ratio Internal-Combustion Engine - The Alvar Engine Concept” Master thesis from the Department of Mechanical Engineering Massachusetts Institute of Technology May 1997
- Johansson B. “Correlation Between Velocity Parameters Measured With Cycle-Resolved 2-D LDV And Early Combustion in a Spark Ignition Engine” 1 86 1993
- Heywood J. B. “Internal Combustion Fundamentals” McGraw-Hill New York 1989 0-07-100499-8
- http://www.patents.ibm.com “Variable compression ratio”