Robert Boschgmbh

Ulrich Steinbrenner

Dieter Gunther

Wolfgang Wagner

Helmut Denz

Ernst Wild

Otto Glockler

Hans Schnurle

Andreas Blumenstock

Gunther Plapp

Albrecht Sieber

Richard Bertsch

Peter Schulzke

Dieter Kirn

Hong Zhang

Eberhard Schnaibel

Klaus Joos

Rudolf Sauer

Peter Werner

Ulrich Drews

Thomas Frenz

Michael Horbelt

Gerhard Schneider

Juergen Gras

Manfred Lembke

Klaus Streit

Ulrich Mayer

Erwin Gloss

Helmut Moder

Gunter Rosenzopf

Wilhelm Sorg

Willi Rosenau

Werner Jaksch

Helmut Pflieger

Waldmar Hans

Stephan Hohne

Jurgen Neubert

Christian-Ernst Schreder

The present invention relates to a method for operating a fuel metering system ( ) of a direct-injection internal combustion engine, having a fuel supply container, at least one prefeed pump a high-pressure pump assembly having at least two high-pressure pumps for pumping fuel out of the low-pressure region into at least one high-pressure reservoir, a control unit for regulating an injection pressure prevailing in the high-pressure reservoir, and having fuel injection valves for injecting fuel out of the high-pressure reservoir into combustion chambers of the engine. In order especially in engines with large displacement and in engines with more than four cylinders to assure reliable supply of fuel to the combustion chambers, it is proposed that the fuel metering system has one fuel circuit for metering fuel into all the combustion chambers of the engine, and all the high-pressure pumps are disposed in the fuel circuit, and that all the high-pressure pumps are triggered independently of one another via a common pressure regulating circuit.

Method for the operation of a fuel metering system on a direct injection internal combustion engine

The invention is directed to a method and an arrangement for synchronizing at least two power-adjusting elements of an internal combustion engine which are electrically driven independently of each other. For carrying out the synchronization, the intervals between the respective combustions or the corresponding segment times of at least two cylinders are detected to which individual power-adjusting elements are allocated and their deviation is determined. At least one power-adjusting element is adjusted in order to maintain this deviation within a pregiven tolerance band. A correction of the control of the power-adjusting elements is derived in dependence upon the adjustment. The power-adjusting elements are adjusted in mutually opposite directions.

Method and arrangement for synchronizing at least two power adjusting elements of an internal combustion engine

Method and device for lowering a boost pressure of a turbocharger

Method and device for controlling exhaust temperature for a combustion

Process for determining a flow rate of a fluid

Stereo lambda control

Method and arrangement for diagnosing the open-loop control of the

A tank-venting arrangement includes: a tank; an adsorption filter connected to the tank; a tank-venting valve interconnecting the adsorption filter and the intake pipe of the engine; a control unit for driving the tank-venting valve so that it closes or opens; a pressure difference sensor for measuring the pressure difference between the pressure in the tank and the ambient pressure; and, an integrating unit for determining the time integral of the pressure difference. With this tank-venting arrangement, a simple and reliable determination can be made as to when so much fuel vapor should have been adsorbed in the active charcoal filter so that when the tank-venting valve is opened thereafter, a lean correction by means of a lambda controller can be required. If this lean correction is not made, this is an indication that the fuel flowing from the tank has not reached the tank-venting valve so that the tank-venting arrangement leaks or is obstructed.

Tank-venting arrangement and method for checking the tightness thereof

A tank-venting arrangement includes: a tank having a tank closure; an electrically drivable check valve; an adsorption filter; connecting lines for interconnecting the above components; a difference pressure sensor which measures the pressure difference between the pressure in the tank and the ambient pressure and supplies a pressure difference signal; a comparator which, at least for a running engine, compares the pressure difference signal to upper and lower threshold values and supplies an opening signal to the check valve to open the latter when the pressure difference signal is greater than the upper threshold value and a closure signal for closing the check valve when the pressure difference signal drops below the lower threshold value; and, a detector unit which supplies an opening signal to the check valve for opening the check valve when the sensor determines a possible opening of the tank and a closure signal for closing the check valve when the sensor determines a possible closure of the tank. With the aid of the check valve and the difference pressure sensor which measures the pressure difference between the pressure in the tank and the ambient pressure, the tank-venting arrangement can be so operated that at least for a running engine, a desired maximum overpressure in the tank can be obtained relative to the ambient pressure independently of the extent of the underpressure in that part of the arrangement forward of the check valve.

Tank-venting arrangement and method of operating the same

Tank-venting system for a motor vehicle and method for checking the

Tank-venting arrangement for a motor vehicle and method for checking the

Method and apparatus for setting a tank venting valve

The invention is directed to a method and an apparatus for controlling the overrun mode of operation of an internal combustion engine, wherein instantaneous values of the relevant negative speed change of the internal combustion engine are sensed and evaluated to control the overrun mode. In this arrangement, a higher resume speed which is selected on commencement of the overrun mode and reduced to a lower speed limit after a predetermined time function, can be shifted additionally in dependence on the negative speed change. Further, to keep an internal combustion engine from stalling, the actual value of the negative speed change can be compared with a predetermined desired value; if it exceeds that value, the decision for a resume of fuel delivery can be made without delay.

Method and apparatus for controlling the overrun mode of operation of an

A method of and a device for regulating air-fuel ratio of an internal combustion engine includes an oxygen or lambda probe and a signal processing unit connected to the lambda probe. The change-overs of the lambda signal at the output of the lambda probe are compared with a succession of adjustable first time intervals t.sub.1 and, when no change-over is detected during the first time interval, the output signal from the signal processing unit which controls the air-fuel ratio is abruptly changed in a jump. To avoid overshoot of the output control signal, there is provided a resetting unit by means of which the jump of the control signal is reversed when the change-over of the lambda signal occurs in an additional monitoring time interval t.sub.2 following the first monitoring time interval t.sub.1.

Method of and device for lambda-regulation of fuel mixture for an

A method and a device for controlling fuel injection in multi-cylinder internal combustion engines, includes means for computing a time shift of a common time point for ignition start in respective cylinders to a new value at which pressure differentials in respective intake pipes are approximately equal and consequently .lambda.-dispersion is minimized.

Method of and device for controlling fuel injection in internal

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Stuttgart, Germany

Ulrich Steinbrenner