EP 1132581 B1 20030115 - Electromagnetic valve with pneumatic spring and toggle drive mechanism
Title (en)
Electromagnetic valve with pneumatic spring and toggle drive mechanism
Title (de)
Elektromagnetventil mit Pneumatikfeder und Kniehebelmechanismus
Title (fr)
Soupape à commande électromagnétique, à ressort pneumatique et articulation par genouillère
Publication
Application
Priority
FR 0003111 A 20000310
Abstract (en)
[origin: EP1132581A1] The valve stem (25) passes through the cylinder head (12) along the axis of the pneumatic spring's cylinder (40). It is aligned, but discontinuous, with the operating plunger (24) of the adjoining electromagnetic actuator (10). The actuator's armature (22) operates in the air-space of a laminated ferromagnetic core (36), carrying an exciting coil (38). On the adjacent ends of plunger and stem are fixed plate pistons (30,34) that slide inside the spring cylinder, forming two pneumatic return springs that keep the valve, at rest, in mid-position between fully open and fully closed. The actuator coil carries current pulses, at a frequency near the natural frequency, alternately raising and depressing the moving parts under the control of a position sensor. The stiffness of the return springs depends on the air pressure in the cylinder. Each is connected to an electrically operated valve (42) controlled by a calculator (44) forming part of the engine management unit. The valve can connect the spring cylinders to a simple discharge (50) or to a reservoir (460 maintained at a constant pressure by a pump (51). 3 variants are described.
IPC 1-7
IPC 8 full level
F01L 1/46 (2006.01); F01L 9/04 (2006.01); F01L 9/20 (2021.01)
CPC (source: EP)
F01L 1/465 (2013.01); F01L 9/20 (2021.01)
Designated contracting state (EPC)
DE ES FR GB IT NL
DOCDB simple family (publication)
EP 1132581 A1 20010912; EP 1132581 B1 20030115; DE 60100081 D1 20030220; DE 60100081 T2 20031009; ES 2189779 T3 20030716; FR 2806146 A1 20010914; FR 2806146 B1 20021025
DOCDB simple family (application)
EP 01400607 A 20010308; DE 60100081 T 20010308; ES 01400607 T 20010308; FR 0003111 A 20000310