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Variable Compression 3
The dream of a variable compression ratio is old, but not yet implemented in the realization of a larger serie. And if you now hear from
Infiniti that they have found a solution to incorporate in the series from 2018, we may perceive with due skepticism.
Even the in our pages, often referred Atkinson process is still a way for changing the effective piston stroke. But the
aim was not the compression changing and especially not variable. The other trials are described in the pages on the left side.
The approach of Infiniti divides the connecting rod into two parts with a joint just as Atkinson did. However, the crankshaft remains as an intermediary of the torque to the flywheel. During the run time of the engine the
angle of the two parts can be changed and to each other and thereby the connecting rod shortend or lengthened. Below in the video, the principle is clearly visible.
What remains is a relatively complicated mechanism to perform effectively this angle changing by a servomotor to a constantly moving part. Again, this is better to see on the graphic above. Amazing is the combination
with charging, because one had thought that a variable boost pressure would replace the relatively complicated variable compression. 08/16
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