Variable-actuation, electro-hydraulic system and device controlling the valves of internal combustion engines

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EP 1 843 013 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	09.09.2009 Bulletin 2009/37

(43)	Date of publication A2:
	10.10.2007 Bulletin 2007/41

(21)	Application number: 07105135.3

(22)	Date of filing: 28.03.2007

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International Patent Classification (IPC):

F01L 9/02^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA HR MK RS

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Priority:

30.03.2006 IT MI20060608

(71)	Applicant: DELL'ORTO S.P.A.
	20038 Seregno (Milano) (IT)

(72)	Inventors:
	Dell'Orto, Pierluigi 20045, Besana Brianza (Milano) (IT) Marchetti, Mario 80038, Pomigliano D'Arco (Napoli) (IT) Chiavazzo, Eliodoro 84012, Angri (Salerno) (IT) Manganiello, Gerardo 82100, Benevento (IT) Di Gaeta, Alessandro 80129, Napoli (IT) Police, Giuseppe 81013, Caiazzo (Caserta) (IT)

(74)	Representative: Faggioni, Giovanmaria et al
	Fumero-Studio Consulenza Brevetti Snc Pettenkoferstrasse 20-22 80336 München 80336 München (DE)

(54)	Variable-actuation, electro-hydraulic system and device controlling the valves of internal combustion engines

(57) Control system of an electro-hydraulic device actuating the valves of internal combustion engines, comprising a cylinder-hydraulic piston assembly for each engine valve (3) to be actuated and means to transfer the piston displacement to the engine valve stem, means (10) to supply control fluid to the cylinder chamber (1) of said cylinder-piston assembly for actuating said piston (2) in the opening direction of the engine valve (3), in contrast to spring means (4) which recall said engine valve (3) into the closed position thereof. The cylinder chamber (1) is put in communication, alternately, on one side with a high pressure source (HP) and, on the other side, with a low pressure chamber (LP), through a single, 3-way servovalve (10), which is switched into a "state b" for putting the chamber (1) in communication with the high pressure source (HP), for a time (T1) corresponding to an initial part only of the opening run of the engine valve (3) or, alternatively, into a "state a", for putting said chamber (1) in communication with the low pressure (LP), for an initial part only of the closing run of the engine valve (3). The 3-way valve (10) comprises a shutter valve (12), slidable between a home position ("state a") and an active position ("state b") under the action of a pressure differential acting on the opposite sides thereof, and of a control electromagnet (21).

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