PROCEDURE AND DEVICE TO IMPROVE THE PERFORMANCE OF AN INTERNAL COMBUSTION ENGINE BY SELECTIVE VARIATION OF THE DEGREE OF COMPRESSION ACCORDING TO THE REGIME OF AN ENGINE

摘要

The invention relates to a device and a process for the selective variation of the compression ratio of an internal-combustion engine according to the engine load. The device comprises, in the cinematic control chain 34 of each intake valve (2), a means (10) causing the intake valve to close before the normal closing moment after bottom dead centre and governed by the current load of the engine so as to function only under low loads; and a means (11) considerably extending the opening period of each intake valve beyond the normal closing moment after bottom dead centre by preventing it from closing completely at this moment and taking action only under high loads. This device makes it possible to improve the performance of internal-combustion engines. IMAGE