Method for providing variable compression ratio in a combustion engine and device for the method

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United States of America Patent

PATENT NO 11441493
APP PUB NO 20220042467A1
SERIAL NO

17425241

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Abstract

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The present invention concerns a method for providing a variable compression ratio in a combustion engine, where the combustion chamber (9) is formed substantially by a piston bowl in the main piston (1), comprising a secondary piston (3) being displaceable against spring action between an upper/outer position which provides minimal volume of the combustion chamber (9) and a lower/inner position which provides maximum volume of the combustion chamber (9), or in a position therebetween depending on introduced air mass before the compression stroke. The method is characterized in arranging said secondary piston (3) resting on a spring (5) with substantially constant spring force adapted such that introduced air mass is to be compressed to a predetermined pressure at the end of the compression stroke. The invention also concerns a corresponding device and a diesel engine comprising such a device.

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Patent Owner(s)

  • HEDMAN ERICSSON PATENT AB

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hedman, Mats Sparreholm, SE 26 196

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