US 5,209,199 AGranted

Control apparatus for turning off an internal combustion engine

AssigneeRobert Bosch GmbH

InventorsLutz Ballhause, Erwin Krimmer

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Abstract

The control apparatus has a fuel injection pump, into which suction chamber fuel is fed by a feed pump that aspirates from a tank. A reversing valve is included in the connecting lines between the tank and the fuel injection pump, and by means of this valve, to turn off the engine, the line connections can be changed such that the suction chamber communicates with the feed side of the feed pump and the compression side of the feed pump communicates with the tank. The reversing valve is embodied as a two-position multiposition valve and has an electromagnet, disposed, partly spray-coated, in the valve housing, which is of plastic, of the multiposition valve. A valve member can be displaced counter to the force of a restoring spring by the electromagnet; the valve member acts upon one ball at a time, serving as a closing body, of double seat valves disposed on both sides of the valve member. The balls are not connected to the valve member but instead are acted upon by it only upon adjustment of the valve member in one acted upon by the pressure of the fuel prevailing in the valve housing.

Claims28

Dependent claims

A control apparatus for turning off an internal combustion engine, in particular a Diesel engine, having a feed pump (13) that aspirates fuel from a fuel supply container (18) via a tank line (19) and a suction line (20) and pumps it into a suction chamber (23) of a fuel injection pump (10) via a pressure line (22) and a connecting line (24);

further having a reversing valve (111), embodied as a two-position multiposition valve, which in a feed position connects the tank line (19) to the suction line (20) and connects the pressure line (22) to the connecting line (24);
said reversing valve has a valve member (14;
114) guided for axial movement inside a valve housing (26;
126), the valve member being displaceable by an electromagnet (17;
117) between the feed position, for operating the engine, and a shutoff position, for turning off the engine;
in said shutoff position the suction chamber (23) of the fuel injection pump (10) is made to communicate with the suction line (20) of the feed pump (13) and the pressure line (22) is made to communicate with the tank line (19);
the valve member further having two seat valve closing bodies (37;
137) actuatable thereby;
each said valve seat closing body cooperating with two associated valve seats (38, 39;
52, 53) disposed in opposed relation;
the valve housing (26;
126) comprised of plastic and produced by injection molding;
the electromagnet (17;
117) disposed in the inner cylinder (29;
129) being at least partly spray-coated with plastic;
and the valve member (14;
114) acting as the magnet armature.

14 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/953,346Filed 30 Sep 1992
Priority: DE 413355710 Oct 1991
Granted: 11 May 1993
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

F02M 63/0215
For cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel…:…
F02D 17/04
Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling: rendering engines inoperative or idling, e.g.…
F02M 59/466
Valves: electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
F02M
Supplying combustion engines in general with combustible mixtures or constituents thereof