SYSTEM AND METHOD FOR VARIABLE ACTUATION OF A VALVE OF AN INTERNAL COMBUSTION ENGINE, WITH AN ELECTRICALLY OPERATED CONTROL VALVE HAVING AN IMPROVED CONTROL

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Abstract

A system for variable actuation of an engine valve of an internalcombustion engine comprises a master piston (16) driven directly or indirectly by a cam (14) of a camshaft (11). A slave piston (21) is driven by said master piston (16) by means of a volume of pressurized fluid (C) interposed between the master piston (16) and the slave piston (21). The slave piston (21) causes the engine valve (7) to open, against the action of a spring (9). An electrically operated control valve (24) controls a communication between the volume of pressurized fluid (C) and an environment at lower pressure (23), with which a fluid accumulator (270) is in communication. An electronic control unit (25) is programmed for controlling the electrically operated control valve (24), so as to actuate the engine valve (7), depending upon the operating conditions, according to one or more different valve modes, including a late-valve-opening (LVO) mode and/or a multilift (ML) valve mode. When one of these valve modes is actuated, the control valve (24) opens the aforesaid communication in advance with respect to the end of the lift cycle of the cam (14), and not after closing of the engine valve (7), in such a way as to prevent or reduce a decrease in pressure in the volume of pressurized fluid (C) after closing of the engine valve (7).

Classe Tecnologica

F - Mechanical engineering, lighting, heating, weapons, blasting

Patent Office

European Patent Office

Numero Deposito

EP 3181842

Anno Deposito

2015

Anno Concessione

2017

Inventori Pugliesi

  • Gargano Marcello

Tutti gli inventori

  • Stucchi Sergio
  • Ricco Raffaele
  • Gargano Marcello
  • De Michele Onofrio
  • Altamura Chiara
  • Lepore Domenico

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Tutti i titolari

  • C.R.F. Società Consortile Per Azioni