Robert Boschgmbh

Iwan Komaroff

Gunther Schmid

Ernst Imhof

Werner Grunwald

Helmut Reum

Kurt Schmid

Bernhard Kaczynski

Katsuoki Itoh

Karl Hofmann

Dietrich Trachte

Kurt Seifert

Thomas Frey

Paul Fussner

Hans-Jorg Vogtmann

Wilhelm Vogel

Ewald Eblen

Alfred Schmitt

Rolf Mayer

Josef Zweng

Katsucki Itoh

Gerhard Auwarter

System for injecting fuel into combustion chambers of an internal

Device for injecting fuel into a combustion chamber of an internal

A fuel injection nozzle for internal combustion engines which has a valve needle loaded in the closing direction and is radially guided and supported in an axially displaceable manner within a nozzle body. The movement of the valve needle is effected in the opening and closing directions in a selectively variable manner, a spring-loaded supplementary mass which performs a dual function being disposed in the nozzle interior. In the opening direction of the valve needle, the supplementary mass is displaced along with the valve needle, while in the closing direction the two elements are separated. The supplementary mass influences the movement of the valve needle both inertially, as the result of its mass, and by effecting a speed-dependent damping, as the result of the positive displacement of a fluid from damping chambers, the whole being adapted to a constant or variable throttle disposed in the fuel inlet conduit.

Fuel injection nozzle

Apparatus for injecting fuel into combustion chambers

An apparatus for the injection of fuel into combustion chambers, in particular of self-igniting internal combustion engines, having an injection nozzle (10) and a subsequent glow body (20), which has a conduit (30) surrounded by heatable walls (26) and serving for the passage therethrough of the injected streams. At least one lateral opening (32) discharges into this conduit (30), the opening preferably communicating with a region (46) of the combustion chamber (36) remote from the core region of the ignition. The air aspirated through the lateral opening (32) warms up and enters into the peripheral zone of the injected streams, where the result is an air-fuel ratio and temperature conditions which are very favorable for ignition. Less heat energy is required to initiate the ignition than in the known apparatus of this general type. By eliminating the conventional glow plugs, which interrupt the movement of air in the combustion chambers, increased power is attained and the emission of soot is reduced sharply.

Apparatus for injecting fuel into combustion chambers of internal

Apparatus for injecting fuel into a secondary flow of combustion air

Device for fuel injection in combustion chambers

A device for injecting fuel in combustion chambers, especially for self-igniting internal combustion engines, is proposed, in which a fuel injection nozzle, by aspirating air through an air guide device in the manner of a jet pump, generates a fuel spray that is surrounded by an air envelope. This air-enveloped fuel spray is directed through a heating element, the heat generation of which is distributed in such a manner over its length that a desired heating profile along the heating element is produced. The type of heating profile depends not only on the properties of the material making up the heating resistor but also on its structural makeup and its electrical bonding. A highly suitable material for the heating resistor is molybdenum silicide (MoSi.sub.2).

Device for injecting fuel in combustion chambers

A fuel injection nozzle for internal combustion engines having a valve needle which enters an intermediate position in a retarded fashion and subsequently reaches its final position quickly. The valve needle is coupled in a positively-engaged manner with a supplementary body which as a result of its mass and/or hydraulically damps the movement of the valve needle over the course of a first stroke portion. At the end of this stroke portion, the supplementary body strikes a shoulder attached to the housing, whereupon the valve needle after the attainment of a notably higher fuel pressure, is separated from the supplementary body and translated quickly into its open position. In special cases, it is also possible for two supplementary bodies to be provided, which are uncoupled one after another from the valve needle and then again recoupled to the valve upon the closure of the valve. With an apparatus of this kind, the injection procedure can be adapted more freely than in the case of the known injection nozzles to a desired course.

Fuel injection nozzle for internal combustion engines

To provide a valve stroke or displacement characteristic with respect to closing force which is at first rapidly dropping and then, after a minimum closing force is reached again increasing, so that, as the valve needle reaches its final stroke, a hard impact is avoided and rapid closure of the valve, upon drop of injection pressure, will result, a magnet circuit (88) is established in the valve housing by a magnetic element (50) and an armature (66), one of the elements being seated in the housing and the other being coupled to the valve needle (18) to provide a closure force-versus-displacement characteristics which at first drops sharply and then flattens. Further magnetic elements formed by two magnets (70, 80), with like poles facing each other are provided, to furnish the closing force-versus-displacement characteristics which increases with increasing displacement, the composite of the two forces acting on the valve being in the form of a hanging curve (FIG. 2: 98) having a minimum (F.sub.6) approximately midway along the length of the stoke of the valve needle (18).

Fuel injection valve, particularly for diesel engines

To provide for coupling the injection needle of a Diesel injection valve with an inertia mass, and thereby provide for speed damping of the movement of the valve, the pressurized Diesel fuel is applied to a chamber (20,68) in the valve body (10,12,14), which slidably retains the needle valve element (18) at a location downstream of the inertia mass, the inertia mass subdividing the chamber into a spring or pressure chamber (20) and a damping chamber (68) forming a dead, or storage chamber for fuel, the inertia mass being slidable in the second chamber and the clearance between the inertia mass and the walls of the chamber forming a throttled connection duct so that, upon command to opening movement, the needle valve element will engage, after a short dead distance (v), the inertia mass (62) which must move against the flow resistance through the throttled connection upon shifting of fuel between the first and second chamber and thus damping the speed of operation of the valve element. The pressure differential at the two sides of the inertia mass will act on the entire cross-sectional area of the inertia mass, to provide high initial damping of the valve needle movement upon initiation of an opening stroke, while permitting a slim construction minimizing external diameter.

Fuel injection valve for an internal combustion engine

An ignition onset sensor for internal combustion engines or the like including an optoelectric converter connected directly or indirectly with the combustion chamber of the engine, the converter having one side facing the combustion chamber which can be freed of soiling by being burned off or glow heated. The ignition onset sensor is particularly useful in internal combustion engines having direct injection as the onset of fuel supply by the fuel pump or the onset of injection at the fuel nozzle can be regulated on the basis of a signal of the ignition onset sensor. The burn-off of the side of the converter facing the combustion chamber is preferably accomplished by an electric arc and, in the case of glow heating, by means of a glow filament disposed in front of that side of the converter, the burn-off or glow heating process being controlled in accordance with the engine operational status, engine operational parameters, and/or at selected times.

Ignition onset sensor for internal combustion engines

To test optical transmissivity of exhaust gases from internal combustion engines without requiring cleaning of confining walls of pipes or tubes, a film of liquid is caused to adhere to the inner surface of a transparent tube or pipe section by rotating the tube or pipe section so that the film will remain at the inner wall due to centrifugal force; light is transmitted transversely of the pipe section and through the exhaust gas. The liquid is preferably continually renewed by applying fresh liquid to the inside of the rotating pipe section, excess liquid being removed from an overflow ridge.

Analyzing gases by testing the optical characteristics of exhaust gases

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Wuppertal, Germany

Iwan Komaroff