Device for varying a piston engine effective volumetric...

F - Mech Eng,Light,Heat,Weapons – 02 – B

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F02B 75/04 (2006.01) F01B 9/04 (2006.01) F01L 1/348 (2006.01)

Patent

CA 2289568

The invention concerns a device for improving the global performance of internal combustion piston engines with variable charge and range by adapting while running their volumetric displacement and/or their volumetric ratio. The modification of the engine effective volumetric displacement is operated by delivering into the induction pipe fresh gases supplied in excess in the cylinder and by controlling the length of the stroke used to compress the gases by means of a supplementary induction valve (15) with variable closing retard. The adjustment of the engine effective volumetric ratio is operated by modifying the initial position of the piston (1) stroke relative to the cylinder by means of a valve gear (14) mounted free at the connecting rod (13) end, of a rack (10) integral with the piston (1) and of a control rack (11) the position of which is controlled by a control device (12) The invention is particularly applicable to motor vehicle engines.

L'invention concerne un dispositif servant à améliorer le rendement global des moteurs à combustion interne à pistons utilisés à charge et régime variables par adaptation en marche de leur cylindrée et/ou de leur rapport volumétrique. La modification de la cylindrée effective du moteur s'opère par refoulement dans la tubulure d'admission des gaz frais admis en excès dans le cylindre et par contrôle de la longueur de course utilisée pour compresser les gaz par le biais d'une soupape d'admission additionnelle (15) à retard fermeture variable. L'ajustement du rapport volumétrique effectif du moteur s'opère en modifiant la position d'origine de la course du piston (1) par rapport au cylindre par le biais d'un engrenage (14) monté libre à l'extrémité supérieure de la bielle (13), d'une crémaillère (10) solidaire du piston (1) et d'une crémaillère de commande (11) dont la position est contrôlée par un dispositif de contrôle (12). Le dispositif selon l'invention est particulièrement destiné aux moteurs d'automobiles.

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