Robert Boschgmbh

Hans-Jorg Vogtmann

Paul Fussner

Gerhard Stumpp

Karl Hofmann

Dietrich Trachte

Iwan Komaroff

Kurt Seifert

Wilhelm Vogel

Max Straubel

Gerald Hofer

Karl Konrath

Werner Faupel

Manfred Schwarz

Klaus Krieger

Katsuoki Itoh

Ludwig Walz

Volker Schneider

For the sake of improving quiet operation during idling and at low partial load by lengthening the injection duration, a fuel injection pump for internal combustion engines has a relief conduit originating in a pump work chamber, the relief conduit including a throttle and being blockable at upper partial load, full load and openable by a control slide. The relief conduit is controlled by a pressure maintenance valve, the opening pressure of which can be adapted from outside to the opening pressure of injection nozzles. The control slide is controlled by a centrifugal governor in such a manner that at idling and lower partial load. The control slide is shifted by the pressure in a fuel low-pressure chamber into its operating position that uncovers the relief conduit, and at upper partial load, full load and starting, the control slide is disconnected from the low-pressure chamber, so that it can drop back into its basic position that blocks off the relief conduit.

Fuel injection pump for internal combustion engines

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

A fuel injection pump in which the beginning of fuel injection can be adjusted to begin earlier than normal, particularly during warm-up by means of an adjusting piston. The adjustment takes place by changing the tension of the return spring which cooperates with the fuel injection adjustment piston.

Fuel injection pump

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 apparatus is proposed for controlling the composition of the operating mixture in internal combustion engines. In this apparatus, a control of the air quantity is effected in accordance with the arbitrarily adjustable fuel quantity by throttling the air intake cross section and by remnant filling of the combustion chambers of the engine by means of recirculated exhaust gas. On the basis of the comparison of the aspirated air quantity with the injected fuel quantity by means of a differential pressure valve, a control pressure building up at a fixed throttle in a discharge line controlled by the differential pressure valve is generated as a control variable for an actuation device of the air throttle valve or for the exhaust recirculation valve in an exhaust recirculation line. On cold starting and warm-up of the engine, a substantially larger fuel quantity is simulated by the diversion of a portion of the compared fuel quantity, and thus a high control pressure is very rapidly attained, with the aid of which the fuel intake cross section is fully opened and the cross section of the exhaust recirculation line is completely closed. This diversion of the fuel is also effected, for instance at full load, whenever the intention is reliable prevention of exhaust recirculation.

Apparatus for controlling the operating mixture composition in internal

The invention relates to a fuel injection system provided with a pump and at least one nozzle, in which the fuel quantity which collects by leakage in the spring chamber of the nozzle for the purpose of limiting the speed of the needle as it opens flows out through a throttle valve in a controlled manner. The throttle valve is controlled in accordance with engine characteristics.

Fuel injection system

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Markgroningen, Germany

Hans-Jorg Vogtmann