compression ratio

(redirected from compression ratios)
Also found in: Encyclopedia.
Related to compression ratios: Lossy compression, Lossless compression

compression ratio

n.
In an internal-combustion engine, the ratio of the volume of the combustion chamber measured before and after a compression stroke.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

compression ratio

n
(Automotive Engineering) the ratio of the volume enclosed by the cylinder of an internal-combustion engine at the beginning of the compression stroke to the volume enclosed at the end of it
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
Mentioned in ?
References in periodicals archive ?
A multi-link system continuously raises or lowers the pistons' reach to transform the compression ratio. High compression ratios aid efficiency, while low ratios enable greater power and torque.
The VC-Turbo engine is able to intelligently switch between compression ratios of 8:1 (for power) and 14:1 (for efficiency) in just over a second.
After observing the feed, compression, and metering zones using full-flight screws with the same screw channel depth in the metering zone but different screw compression ratios, we established a model of the plastication process.
A multi-link system continuously raises or lowers the pistons reach to transform the compression ratio. High compression ratios aid efficiency, while low ratios enable greater power and torque.
In such cases, the fluctuations of the compression ratios controlled by different controllers are shown in Figure 13.
This is done by keeping good quality of the image even for high compression ratios, giving a higher PSNR than DCT for the same compression ratio, and permitting better edge recovery than the Haar transform.
The compression ratios of the pads were controlled by adjusting the height of the mechanical interface of the heat sink.
The Effect of Bond Strength of Adhesive Interface on Ultimate Bearing Capacity under Different Axial Compression Ratios
We used three compression ratios: 0.6, 0.8, and 1.0 that of the normal speech rate (the compression ratio of 1.0, namely, was normal speech rate).
[4] applied the HCCI combustion to natural gas engines and investigated methods of ignition control by optimization of intake air temperatures and compression ratios. A further HCCI issue is the difficulties with ignition timing control even for similar commercially available research octane number fuels.