EP 0050710 B1 19840411 - FUEL INJECTION SYSTEM
Title (en)
FUEL INJECTION SYSTEM
Publication
Application
Priority
DE 3039967 A 19801023
Abstract (en)
[origin: US4388908A] To provide for extremely rapid operating conditions of the valve in an electrically controlled fuel injection system, that is, valve operation in the order of 10-5 seconds, for example, a pump (2, 62) provides pressurized fuel, and two, in push-pull operating valves (4, 64; 5, 65) are provided, in which one of the valves (4, 64) controls initiation of fuel injection, and the other one of the valves (5, 65) controls termination thereof; each one of the valves uses a spring-loaded valve element (18, 38'', 38, 38'), operated by the pressure of the fuel to be injected, the valve elements being retained in a predetermined position by an electrically controlled operating unit (27, 47''; 47, 47') which has a positioning element operating in a positioning path having at least a component which is perpendicular to the operating direction of the valve element and which, as commanded by the control voltage applied thereto, clamps the valve element in a predetermined position, and thus prevents movement of the valve element even though fluid pressure is applied thereto. Preferably, the electrical control element is a stack of piezoelectric disks which, upon energizaton, expand in axial direction and press a clamping stem (26, 46''; 46, 46') the movable valve element (18, 38'', 38, 38') in an operating bore of the valve unit or housing (16, 36).
IPC 1-7
IPC 8 full level
F02M 51/00 (2006.01); F02M 47/02 (2006.01); F02M 59/36 (2006.01); F02M 59/46 (2006.01); F02B 1/04 (2006.01); F02M 63/00 (2006.01)
CPC (source: EP US)
F02M 47/027 (2013.01 - EP US); F02M 59/366 (2013.01 - EP US); F02M 63/0026 (2013.01 - EP US); F02B 1/04 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0050710 A1 19820505; EP 0050710 B1 19840411; DE 3039967 A1 19820603; DE 3163073 D1 19840517; JP S5799266 A 19820619; US 4388908 A 19830621
DOCDB simple family (application)
EP 81105545 A 19810715; DE 3039967 A 19801023; DE 3163073 T 19810715; JP 16730581 A 19811021; US 31167681 A 19811015