Robert Boschgmbh

Aisin Seiki Kabushiki Kaisha

Klaus Krieger

Karl Konrath

Manfred Schwarz

Max Straubel

Ludwig Walz

Karl-Friedrich Russeler

Claus Koester

Wolf Wessel

Gerhard Stumpp

Hermann Grieshaber

Max Greiner

Wolfgang Braun

Heinz Nothdurft

Helmut Tschoeke

Hans-Jorg Vogtmann

Heribert Haerle

Karl Zibold

Roland Kupzik

Michael Scharf

Gottfried Schiller

Ulrich Stratemeier

Carlos Alvarez-Avilla

Wolf-Rudiger Walk

Volker Schneider

Wulf Emsmann

Michael Wenz

Hanspeter Leutz

Hartmut Birr

Arne Deseyve

Juergen Grossmann

Shinya Koide

A method and apparatus for injecting fuel into combustion chambers of an internal combustion engine, in which the total injection quantity for the engine is split into a main injection quantity and a small postinjection quantity, the latter being closely coupled to the end of the main injection quantity and being injected with the same fuel pressure as the main injection quantity. This reduces soot emissions at otherwise identical engine operating parameters. Because of the interaction among soot emissions, NO.sub.x emissions and specific consumption, the postinjection, while soot and NO.sub.x emissions are kept the same, can also be employed to lower the specific consumption of the engine.

Method for injecting fuel into the combustion chambers of an

Fuel injection pump for internal combustion engines

Fuel injection pump

The apparatus has a fuel injection pump with two partial suction chambers separate from one another. Fuel is delivered to the first partial suction chamber by a second feed pump. A feed pump is associated with the second partial suction chamber, and a reversing valve is disposed between the feed pump and the second partial suction chamber. To inactivate the cylinders of the engine that are associated with the second partial suction chamber, the reversing valve is reversible into a deactivation position, in which the intake side of the feed pump communicates with the second partial suction chamber and the pressure side communicates with the fuel supply tank. Fuel is thus evacuated from the second partial suction chamber by the second feed pump, so that fast inactivation of the associated cylinders is attained.

Apparatus for disconnecting individual cylinders on an internal

Distribution-type fuel injection pump for internal combustion engines

Arrangement for controlling fuel flow to an internal-combustion engine

When motor vehicles are driven, discontinuities that lead to load spikes arise between overrunning and running under load. The load spikes are avoided by means of a discontinuous increase in fuel quantity, which makes it possible for the engine to come gently to rest in its suspension, to bypass the drive play, and to convert the changes in increased fuel quantity without bucking. By incorporating drag elements into the connection between the arbitrary actuation of an intermediate lever, which affects the fuel injection quantity, and an idling stop, a discontinuous adjustment of the intermediate lever is attained.

Fuel injection pump for internal combustion engines, especially diesel

An exhaust-gas recirculating system for internal-combustion engines includes a fuel-injection system which generates a hydraulic back pressure during control of the load- and speed-dependent variation of the beginning of delivery within a given set of load and speed characteristics. An hydraulic back pressure is used directly to control a pneumatic directional valve by means of an hydraulic servomotor. This directional valve, in turn, controls a vacuum-operated exhaust-gas recirculation valve. The hydraulic back pressure is also controlled by means of a pressure-holding valve and a constricting throttle.

Exhaust-gas recirculating system for internal-combustion engines

In a fuel injection pump for internal combustion engines for motor vehicles, a damping device is provided to eliminate so-called vehicle bucking. The device allows rapid adjusting movements of an rpm adjusting lever, which is connected to the driving lever, to affect the supply quantity setting of the fuel injection pump only with a delay. To this end, the damping device has a damping chamber defined by a damping cylinder and a damping piston displaceable therein. The damping chamber communicates with the pump interior via two parallel throttles and via counter-parallel check valves located in series with the parallel throttles. The damping piston is connected to a damper lever on which the rpm adjusting lever is supported via a pre-stressed drag spring. The damper lever is connected via a governor spring to a governor lever, which actuates a quantity adjusting device to determine the fuel metering, so that an adjusting motion of the rpm adjusting lever acts upon the quantity adjusting device only in a delayed manner.

Fuel-injection pump for internal combustion engines, in particular for

A fuel injection pump, for use with a supercharged internal combustion engine, is provided with a full-load stop that is adjustable by means of a stepper motor in dependence upon operating parameters such as engine speed and manifold pressure. An electrical control device for the stepper motor is housed in a casing which is flange-mounted on the fuel injection pump and cooled by fuel. Electrical transducers for engine speed and manifold pressure are also mounted on the fuel injection pump.

An apparatus is proposed for controlling an exhaust recirculation device in internal combustion engines, in which a throttle device in an exhaust recirculation line is opened on the condition that the position of the load-adjusting lever of a fuel injection pump associated with the engine falls below a maximum load position and that the adjusting member of an rpm governor of the fuel injection pump is below a predetermined deflection position and/or is operated above a lower rpm value. With an embodiment of this kind, the control of exhaust recirculation quantities can be performed in a simple and functionally reliable manner for the various operational points of the engine with the greatest possible approximation of the permissible values.

Apparatus for controlling an exhaust recirculation device in internal

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

An apparatus is proposed which serves the purpose of load-dependent actuation of an adjustment device, wherein the cross section and/or the pressure drop of an exhaust recirculation line in an internal combustion engine can be varied in accordance with load. An injection pump of conventional design is associated with the internal combustion engine and further includes a quantity adjustment device, the position of which acts as a control variable for the load. With this control variable, a booster apparatus is controlled via a comparison apparatus; the output variable of the booster apparatus in turn is the control variable for the actuation of an adjustment device which acts on an exhaust recirculation control apparatus. When a threshold value for load is exceeded, the exhaust recirculation is precluded. The control variable is preferably formed as a fuel pressure signal with the fuel withdrawn from the suction chamber of the injection pump. Apparatuses are proposed by means of which, in the event of the actuation of the control apparatus for exhaust recirculation, the smallest possible removal quantity of fuel is required for control purposes.

Apparatus for actuating an adjustment device acting upon a control

Growing community of inventors

Affalterbach, Germany

Klaus Krieger