Robert Boschgmbh

Franz Rieger

Ernst Linder

Klaus D Muller

Helmut Maurer

Winfried Moser

Hermann Dietz

Eckart Damson

Horst Franke

Michael Huebel

Gernot Wuerfel

Juergen Stein

Rainer Schussler

Karl-Hermann Friese

Reinhard Latsch

Udo Sieber

Walter Benedikt

Gottlob Haag

Leo Steinke

Rainer Norgauer

Hans Schlembach

Gunter Wossner

Thomas Ludwig

Harald Reber

Bodo Ziegler

Ulrich Brenner

Stefan Kampmann

Konrad Eckert

Cornelius Peter

Hans-Martin Wiedenmann

Ferdinand Grob

Lothar Raff

Christian Preussner

Peter Jurgen Schmidt

Rainer Burkel

Friedrich J Esper

Andreas Eichendorf

Heinz Geier

Heiko Gruner

Gunther Stecher

Fevzi Yildirim

Gerhard Holfelder

Günther Hohl

Michael Hübel

Karl H Friese

Ulrich Becker

Jürgen Stein

Harald Maisch

Gerhard Dillman

Helmut Mauer

Hermann Ziener

Rainer Schubler

A fuel injector (), in particular a fuel injector () for fuel injection systems, includes a first solenoid () cooperating with an armature (), a second solenoid () cooperating with the armature (), and a valve needle () friction-locked to the armature () for actuating a valve closing body, a force being exertable on the armature () in a closing direction using the first solenoid () and in an opening direction using the second solenoid ().

Fuel injection valve and method for operating the same

A fuel injector, in particular a fuel injector for fuel-injection systems of internal combustion engines, includes a first magnetic coil cooperating with a first armature, a second magnetic coil cooperating with a second armature, and a valve needle which is in force-locking connection with the first armature via a first flange and to the second armature via a second flange, to actuate a valve-closure member. A restoring spring acts upon the valve needle in a closing direction of the fuel injector. A first positioning spring, situated between the first flange and the first armature, acts upon the first armature in the closing direction of the fuel injector, while a second positioning spring, situated between the second flange and the second armature, acts upon the second armature in an opening direction of the fuel injector.

Fuel injection valve

A fuel injector is described, in particular an injector for fuel injection systems in internal combustion engines, that includes a valve needle having a valve-closure member which cooperates with a valve-seat surface arranged in valve-seat member to form a sealing seat and which has several injection orifices which are arranged downstream from the sealing seat, and are sealed by sealing seat against a fuel supply. A disk element is arranged downstream from the sealing seat, the disk element having at least one valve section, which changes its shape when the temperature changes. Valve section is connected to a heating element and optionally covers an injection orifice.

Fuel injector

A fuel injector for fuel injection systems in internal combustion engines, including an actuator, a valve needle operable by the actuator for operating a valve-closure member, which, together with a valve-seat surface forms a sealing seat and a swirl device including at least one swirl channel, through which fuel flows with a tangential component relative to a longitudinal axis of the fuel injector. The axial position of a plunger element determines a cross-section of at least one bypass channel that bypasses the at least one swirl channel without a tangential component.

A fuel injector having an integrated spark plug for injecting fuel directly into a combustion chamber of an internal combustion engine and for igniting the fuel that is injected into the combustion chamber has a valve body, which, together with a valve-closure member, forms a sealing seat. Disposed contiguously to the sealing seat is a discharge orifice, which discharges at a valve-body end face facing the combustion chamber. Provision is also made for a housing body that is insulated from the valve body, and for an ignition electrode that is connected to the housing body. In this context, a spark arc-over is produced between the valve body and the ignition electrode. The ignition electrode and the valve body are formed so that the spark arc-over occurs between the end face of the valve body facing the combustion chamber and the ignition electrode. In the vicinity of the discharge orifice, the ignition electrode has an edge to reproducibly define the position of the spark arc-over at the end face of the valve body with respect to the position of the discharge orifice.

Fuel injector having integrated spark plug

A fuel injector having an integrated spark plug ( ) for injecting fuel directly into a combustion chamber ( ) of an internal combustion engine and for igniting the fuel that is injected into the combustion chamber ( ) has a valve body ( ), which, together with a valve-closure member ( ), forms a sealing seat. Disposed contiguously to the sealing seat is a discharge orifice ( ), which discharges at a valve-body ( ) end face ( ) facing the combustion chamber ( ). Provision is also made for a housing body ( ) that is insulated from the valve body ( ), and for an ignition electrode ( ) that is connected to the housing body ( ). In this context, a spark arc-over is produced between the valve body ( ) and the ignition electrode ( ). The ignition electrode ( ) and the valve body ( ) are formed in such a way that the spark arc-over takes place between the end face ( ) of the valve body ( ) facing the combustion chamber ( ) and the ignition electrode ( ). In the vicinity of the discharge orifice ( ), the ignition electrode ( ) has an edge ( ) in order to reproducibly define the position of the spark arc-over at the end face ( ) of the valve body ( ) with respect to the position of the discharge orifice ( ).

Fuel injection valve with integrated spark plug

A fuel injection valve ( ) having an integrated sparkplug for direct injection of fuel into the combustion chamber of an internal combustion engine and for igniting the fuel injected into the combustion chamber has a valve body ( ) which, together with a valve closing body ( ) operated by a valve needle ( ), forms a seal seat. The valve body ( ) and to some extent the valve needle ( ) are surrounded radially by an insulating body ( ). The insulating body ( ) is in turn surrounded radially at least in part by a housing body ( ). Ignition electrodes ( ) are provided on the valve body ( ) and the housing body ( ). The valve needle ( ) has a first metal guide section ( ) guided in a swirl insert ( ), a second metal guide section ( ) guided in the insulating body ( ) and an insulating section ( ) arranged between the guide sections ( ). The guide sections ( ) are connected in a positive manner to the insulating section ( ).

In lean operation of internal combustion engines having externally supplied ignition, improvement in terms of fuel consumption and emissions are obtained if the fuel is injected directly into the combustion chamber. Because the gas exchange guide cross sections are large, the space available for installing the injection valve and spark plug is very limited, and disruptions in the course of combustion occur when the injection valve and ignition device are too far apart. By developing a fuel injection valve that has wire electrodes on the injection end to serve as an ignition device, the spark gap arcing over in the vicinity of the fuel introduced by the injection valve, optimal ignition conditions are attained even for poorly ignited fuels or when the proportion of fuel in the combustion chamber charge is extremely low (stratified charge operation).

Disclosed is a method and device for regulating the preparation of fuel-and-air mixture in a carburetor, fuel injection system and the like of an internal combustion engine. The device includes an oxygen probe directly communicating with the combustion chamber of the engine. Periodically fluctuating output signal of the probe is applied to an averaging circuit which produces an average output signal over a predetermined number of engine cycles. The shape and length of the averaged output signal is indicative whether the mixture ratio is lean or rich. The averaging can be made by means of a lowpass filter, an integrator or at least one counter counting in response to the angular position of the crankshaft or the predetermined time intervals. When the probe output voltage has the form of a hump or bulge, its length or area is used for determining the actual .lambda. value in the rich range of ratios of the mixture.

Method of and device for regulating fuel-and-air mixture supplied to an

To permit adjustment of the combination sparkplug-optical sensor for heat transfer upon operation of the sensor-sparkplug combination as a sparkplug, in accordance with known sparkplug technology, the insulator of the sparkplug is formed with a central opening in which a material is included which is electrically conductive and providing for controlled heat transfer, for example a packing or a mixture of aluminum oxide with a conductive powder, such as graphite, aluminum, or copper; or, alternatively, sheet metal elements may be located therein providing controlled radial engagement around a central glass rod forming the optical sensor and the inner wall of the opening and the insulator (FIG. 2); or, alternatively, axially resilient elements, such as a bellows-like corrugated metal element (FIG. 3) or a stack of spring disks (FIG. 4) may be positioned in the opening, axially biased by screwing the connecting terminal (10) into a tapped opening of the insulator. Heat transfer or transmission control is effected by introducing between metallic components of the combination and the glass rod a heat conductive mass (2) which fills the space between the glass rod and the metallic components over a predetermined length, in accordance with desired heat transfer characteristics.

Combination sparkplug and combustion process sensor

To facilitate assembly of a central glass rod in an optical sensor-spark plug combination, electrical energy is conducted to the spark end of the combination by a high temperature resistant tube or sleeve 11 surrounding a central glass rod 2 for only a limited portion of the entire length; electrical energy is conducted to the high temperature resistant sleeve 11, which forms the sparking end of the spark plug, from a terminal connector 1 by a packing 10 of electrically conductive powder, which may include radio noise suppression resistance characteristics, held in place by a compression spring 8, in electrical connection with the terminal connector 1; or by a separate tube 12 surrounding the glass rod 1, and of non-heat resistant material, the glass rod 1 being separated from the other tube 12 by an adhesive which, at the connecting end of the spark plug, need not be high temperature resistant.

Spark plug and optical combustion sensor combination

The invention is directed to an arrangement for controlling an internal combustion engine equipped with glow plugs. The arrangement includes a heat-control circuit for controlling the temperature of the glow plug and an ancillary control circuit which can be a fuel control circuit for example. The ancillary control circuit takes over from the heat-control circuit for the purpose of controlling the ignition time point of the mixture when the temperature-control has reached its limit. A comparator is provided to monitor the heat-control circuit and to activate the ancillary control circuit if necessary.

Arrangement for controlling a internal combustion engine equipped with

The linearity of response of a polarographic sensor, of the diffusion-limited current type, having a solid electrolyte (1) and being particularly adapted for measuring oxygen content in exhaust gases from combustion processes, is improved by providing the anode (2b) of the sensor's first, measuring cell with a constant, internal supply of reference oxygen. Preventing the oxygen concentration at the anode (2b) from fluctuating eliminates a non-linearity which would otherwise occur in the plot of oxygen concentration versus diffusion-limited current, as the fuel/air ratio of the mixture being combusted passes 1. The oxygen supply takes the form of a second, pumping cell (3a,3b) which can utilize the same solid electrolyte layer (1) as the first cell, and which pumps oxygen ions across the electrolyte to the second cell's anode (3b), where they become oxygen molecules and are directed through a duct (8) to the measuring cell's anode (2b). Excessive pressure in the duct (8) is prevented by providing small pores (10) in the surrounding glass cover (9) for outward diffusion of excess oxygen. A constant voltage is applied to both cells.

Polarographic sensor and sensing system for determining oxygen content

To protect the light guide element of a combustion sensor, for example combined with a spark plug, and extending through a bore in the center electrode thereof against high temperatures and attach due to environmental conditions occurring within the combustion chamber, a protective element of a high temperature resistant, light transmitting ceramic, preferably alpha-crystalline aluminum oxide is located at the combustion end portion, for example in form of a disc 14, held in position by a turned-over flange of the end portion of the center electrode 13 of a spark plug-sensor combination.

Combustion condition sensor

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Aalen, Germany

Franz Rieger