oiseautempete wrote:If it exists, but not yet in series, at MCE5, established in Lyon:
http://www.mce-5.com/The principle strongly interests PSA ...
excuse me vainly but still a mistake
the MCE-5 has only the variation of the volumetric ratio and in no case the variation of the cubic capacity.
the MCE-5 has a piston (or of) which moves away from the cylinder head or approaches it but the distance between the piston at TDC and the PMB never changes:
clear :
the stroke is determined by the bottom crankshaft and the hydraulic cylinder parallel to the engine piston "goes down" or "goes up" the piston without the stroke changing so the displacement does not change, since it is dependent on the bottom crankshaft.
what changes is the distance between the cylinder head and the piston therefore the volumetric ratio.
for the record, the volumetric ratio:
22/1, for example: 1 is the volume of the combustion chamber and 22 is 22 times the volume of the combustion chamber.
the volume of the displacement (22) is the volume between the TDC and the TDC.
the MCE-5 displaces the TDC while displacing the PMB by the same distance, but due to the fact that the chamber takes up volume, (if the piston moves away from the cylinder head), the gear ratio comes for example 18/1.
PS: 1 / these figures correspond to a diesel, for MCE-5 it is a petrol rectify the proportions.
2 / the variable displacement engine has been around for a long time as protos (to be improved) and patent since 2008. Even if it is simpler it is complicated to develop, for the problem that I have already said:
with a variation of displacement follows the volumetric ratio difficult to "connect" the two, which is essential and necessary.
cordially