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US 11,441,493 B2Granted
Method for providing variable compression ratio in a combustion engine and device for the method
AssigneeHedman Ericsson Patent AB
InventorMats Hedman
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AssigneeHedman Ericsson Patent AB
InventorMats Hedman
Estimating the term…
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.
A method for providing a variable compression ratio in a diesel engine comprising a combustion chamber formed substantially by a piston bowl in a main piston, the diesel engine comprising a secondary piston being displaceable against spring action between an upper/outer position which provides minimal volume of the combustion chamber and a lower/inner position which provides maximum volume of the combustion chamber, or in a position therebetween depending on introduced air mass before a compression stroke, wherein the method comprises:
A device for providing a variable compression ratio in a diesel engine having a combustion chamber formed substantially by a piston bowl, the device comprising:
A diesel engine comprising:
Dependencies are inferred from the claim text.