Verbrennungsmotor mit einem System zur variablen Betätigung der Einlassventile mit Dreiwege-Magnetventilen und Verfahren zur Steuerung des Motors

Details

Veröffentlichungs-Nr.

EP2693008

Aktenzeichen

EP13156804

Anmeldetag

31. Juli 2012

Veröffentlichung

3. Dezember 2014

Erteilung

3. Dezember 2014

Rechtsraum

EP

IPC

F01L9/02F01L1/26F01L1/344

Abstract

An internal-combustion engine with two intake valves (7A, 7B) for each cylinder is provided with a system for variable actuation of the intake valves, comprising a single solenoid valve for each cylinder that controls communication of the pressurized-fluid chamber (C) of the system with an exhaust channel (23). The solenoid valve is a three-way, three-position solenoid valve, comprising an inlet (i) permanently communicating with the pressurized-fluid chamber and with the hydraulic actuator of an intake valve (7B), and two outlets (u1, u2) communicating, respectively, with the actuator of the other intake valve (7A) and with said exhaust channel. The solenoid valve has a first position (P1), in which the inlet communicates with both of the outlets, a second position (P2), in which the inlet communicates only with the aforesaid outlet (u1) connected to the actuator of an intake valve (7A) and does not communicate, instead, with the outlet (u2) connected to the exhaust channel (23), and a third position (P3), in which the inlet (i) does not communicate with any of the two outlets (u1, u2). There is envisaged an operating mode in which the solenoid valve is brought into the aforesaid third position (P3) at the start of the aforesaid active phase of the respective tappet so as to cause initially only opening of said first intake valve (7B) and subsequently, in the course of said active phase of the tappet, said solenoid valve is brought into its second position (P2) so as to cause opening of said second intake valve (7A) with a delay with respect to opening of the first intake valve (7B), said solenoid valve being kept in said second position (P2) up to the end of said active phase of the tappet.

Anmelder

Firma

C.R.F. Società Consortile per Azioni

Land

🇮🇹 Italien

Fachgebiete