Robert Boschgmbh

Other

Eberhard Schnaibel

Erich Schneider

Erich Junginger

Lothar Raff

Klaus Winkler

Klaus Hirschmann

Andreas Koring

Frank Blischke

Lutz Reuschenbach

Andreas Blumenstock

Holger Bellmann

Hong Zhang

Bernd Schumann

Georg Mallebrein

Ernst Wild

Gunther Plapp

Ernst Linder

Helmut Denz

Lothar Diehl

Cornelius Peter

Christoph Woll

Thomas Wahl

Frank Stanglmeier

Alfred Sigl

Heinz Leiber

Martin Streib

Klaus Joos

Winfried Moser

Gholamabas Esteghlal

Michael Fey

Helmut Maurer

Harald Neumann

Thomas Huber

Stefan Tumback

Martin Klenk

Werner Mezger

Ulrich Steinbrenner

Rene Schenk

Johann Riegel

Helmut G Schwegler

Peter Baeuerle

Jens Wagner

Nikolaus Benninger

Bernd Kesch

Claudius Bevot

Franz Brugger

Helmut Fleischer

Ulrich Kuhn

Thomas Moser

Andy Tiefenbach

Michael Westerdorf

Kersten Wehmeier

Wilhelm Hertfelder

Thorsten Fritz

Richard Hotzel

Ruediger Deibert

Claus-Peter Pflieger

Bernhard Ebinger

Wolfgang Wagner

Rolf-Hermann Mergenthaler

Hans Veil

Michael Daetz

Manfred Pfitz

Detlef Heinrich

Rudi Mayer

Dieter A Schuler

Stephan Uhl

Roland Herynek

Karsten Mann

Axel Stuber

Richard Holberg

Manfred Homeyer

Dieter Roller

Frank Kowol

Eugen Joos

Johannes Kanters

Michael Nicolaou

Christian Klinke

Harry Braun

Klaus Hahn

Magnus Labbe

Klaus Boettcher

Bernd Heppner

Wolfgang Richter

Thomas Golzer

Wolfgang Korasiak

Joachim Heimes

Michael Hermann

Hans P Geering

Oliver Schlesiger

Lu Chen

Reinhard Hein

Johannes-Dieter Wichterich

Eduard Weiss

Konrad Henkelmann

Heinz-Jurgen Koch-Ducker

Fritz Ackermann

Wilfried Tuleweit

Klaus Benninger

Peter-Juergen Schmidt

The invention relates to a method and device for diagnosing deviations in a single cylinder lambda control in an internal combustion engine having at least two cylinders and an exhaust gas sensor designed as a broadband lambda sensor, wherein a pump current is evaluated by means of a pump cell and the pump current is used at least temporarily for an individual cylinder lambda control. According to the invention, a pump voltage or a pump voltage change is determined via the pump cell in addition to the pump current and the value is transmitted to a diagnosis apparatus. Deviations in the single cylinder lambda control can thus be better diagnosed without additional material expense according to the invention, which provides advantages in particular in respect of tightened rulemaking in on-board diagnosis. A preferred application of the method is the use in internal combustion engines having multi-bank exhaust systems.

Method and device for diagnosing deviations in a single cylinder lambda control

A method for operating an exhaust gas probe, in particular a lambda probe, in the exhaust gas of an internal combustion engine, where at least one heating element for achieving the operating temperature in the exhaust gas probe and determination of the temperature of the exhaust gas probe is performed by measuring the internal resistance. Measurement of the internal resistance occurs by the superimposition of discrete bipolar test pulses that include a pulse and a counter pulse, and by acquisition of the Nernst voltage.

Method for operating a heatable exhaust gas probe

A method for setting operating states of an internal combustion engine, in particular an internal combustion engine of a hybrid drive. In addition to the internal combustion engine, the hybrid drive includes at least one electric drive, a hybrid coordinator and a control unit assigned to the internal combustion engine in which functions are implemented. The functions request operating states favorable to their running ability from the hybrid coordinator which performs a commensurate modification of the distribution of power between the internal combustion engine and the at least one electric drive.

Defined internal combustion engine operation in vehicles having a hybrid drive

A method for regulating the fuel/air ratio of a combustion process which is operated alternatingly with excess air and air deficiency, and having at least one catalyst volume in the exhaust gas of the combustion process which stores oxygen when there is excess oxygen in the exhaust gas and gives it off when there is oxygen deficiency, in which method the oxygen charges into the catalyst volume taking place when there is excess air, and the oxygen discharges from the catalyst volume taking place when there is air deficiency determined, and in which the fuel/air ratio is regulated in a first control loop such that the sum of the oxygen charges and oxygen discharges determined in a predefined interval takes on a predetermined value, wherein the combustion process is operated using oxygen excess or oxygen deficiency, respectively, at least until these appear at an oxygen-sensitive Nernst probe downstream from the catalyst volume.

Method and device for regulating the fuel/air ratio of a combustion process

A procedure to calculate the Lambda value with a wideband Lambda sensor of an internal combustion engine of a motor vehicle is thereby characterized, in that from the measured pumping electricity and the sensitivities of the wideband Lambda sensor as well as the gas concentration ratios, in the lean operation an oxygen concentration and in the rich operation an oxygen deficit are determined and from these respectively a conclusion is drawn about the Lambda value using the Pischinger Formula.

Procedure for the determination of the Lambda values with a broadband Lambda probe

The invention concerns a procedure to determine the oxygen storage capability of an emission control system with an exhaust gas sensor with discrete-level ability disposed in front of the emission control system. If in a period of time before the determination of the oxygen storage capability, the control intervention of the exhaust gas sensor is ascertained, and if this mean value is taken into consideration when calculating the fuel-delivery control phase during the determination of the oxygen storage capability of the emission control system, or if this mean value is used to correct the lambda value used to calculate the amount of oxygen stored, an improved measuring accuracy can be achieved while using a cost effective discrete level sensor. In that during the rich or lean operation of the cycle to determine the oxygen storage capability, the mean value of the control intervention is used for the calculation, pre-control errors are compensated for, as they can arise, for example, through dispersion of the injection valves or errors in the acquisition of cylinder fill. If the mean value is used to correct the lambda value, the amount of oxygen stored can be more accurately determined as a result of the measured air mass. In the procedure according to the invention, a cost effective step discrete-level sensor can be used in front of the emission control system.

Procedure to measure the oxygen storage capability of an emission control system

A method for diagnosing the dynamic characteristics of a lambda sensor, which is used at least intermittently for a cylinder-individual lambda closed-loop control, which provides for at least one actuating variable of the lambda closed-loop control to be detected and compared to a specifiable maximum threshold, and, if the maximum threshold is exceeded, the dynamic response of the lambda sensor is deemed insufficient with respect to the usability for the cylinder-individual lambda closed-loop control.

Method and device for diagnosing the dynamic characteristics of a lambda probe used for the lambda regulation of individual cylinders

A circuit configuration for operating a gas sensor is described, including a reference gas space in which an electrode is situated which is supplied with a reference gas pump current to maintain the concentration of the reference gas. A diagnostic system determines a concentration change of the reference gas via a change in the reference pump current and a time-based evaluation of the sensor signal of the gas sensor.

Circuit arrangement for operating a gas sensor

A method for the dynamic diagnosis of an exhaust gas analyzer probe situated in an exhaust-gas system having at least one exhaust-gas catalytic converter, of an internal combustion engine, a measuring signal (lambda-actual) of the exhaust gas analyzer probe being compared to a setpoint value (lambda-setpoint) as a function of the operating state of the internal combustion engine, and the system deviation being supplied to a controller, which regulates the operating parameters of the internal combustion engine correspondingly, the dynamic diagnosis of the exhaust gas analyzer probe being implemented with a closed control loop, and the deviation from the setpoint value (lambda-setpoint) of the measuring signal (lambda-actual) of a slowing exhaust gas analyzer probe being amplified by the intervention of the controller and the dynamic diagnosis is implemented on the basis of this amplified deviation. The method allows a reliable diagnosis of the dynamic response of the exhaust gas analyzer probe with excellent differentiation with respect to stochastically occurring fault signals.

Method for dynamic diagnosis of an exhaust gas analyzer probe

A method for controlling and regulating an electrical heating of a probe situated in the exhaust system of an internal combustion engine, a total heating power of the probe being set, and an actual temperature value of the probe being determined by measuring a characteristic parameter, e.g., a resistance. To prevent overheating of the probe ceramics, and therefore over-compensation of aging effects when using such a method, a rated heating power is determined by way of a program map as a function of operating points of the internal combustion engine; a control heating power is determined from the actual temperature value and a new setpoint value in a controller; and the total heating power is formed as the sum of the rated heating power and the control heating power. Moreover, due to this procedure, the regulating reserve of the controller is retained in wide ranges of the operating points. A cost advantage is yielded, because a measuring resistor and an analog-to-digital converter can be omitted. Also, a device for controlling and regulating an electrical heating of a probe situated in the exhaust system of an internal combustion engine, for implementing the method. Because a program map and a controller are connected via a summing stage, a particularly simply constructed device is provided which prevents overheating of the exhaust gas analyzer probe.

Method and device for control and diagnosis for the heating of a lambda probe

A method and an electronic circuit for regenerating an electrical contact are provided in order to remedy the problem of electrical contacts becoming highly resistive over time. Electrical contacts become highly resistive over time, particularly when the contacts are thermally highly stressed and/or exposed to corrosive gases. To remedy this undesired effect and to reestablish the low resistance of the contacts, an electrical regenerating signal is applied to these contacts.

Method and electronic circuit for regenerating an electrical contact

The invention further relates to a method and a model for modeling a discharge phase of a nitrogen oxide (NOx)-storage catalytic converter (') of an internal combustion engine (). The NOx-storage catalytic converter (&#x2032;) is subdivision into an oxygen (O2)-store and a nitrogen oxide (NOx)-store and a reducing agent mass flow (msrg) is determined which charges the O2-store and the NOx-store. To model a discharge phase of the NOx-storage catalytic converter (&#x2032;), the O2-store is modeled via a first integrator for oxygen (O2) and the NOx-store via a second integrator for nitrogen oxide (NOx) and the first integrator and the second integrator are charge proportionally with the reducing agent mass flow (msrg) in accordance with an apportioning factor determined in dependence upon the O2-store content (mo2sp) and the NOx-store content (mnosp) of the NOx-storage catalytic converter (&#x2032;).

Method and model for modeling a discharge phase of a nitrous oxide storage catalytic converter

The invention relates to a method for operating a nitrogen oxide (NOx) storage catalytic converter (). During a first operating phase of the storage catalytic converter (), nitrogen oxides are stored and, during a second operating phase, stored nitrogen oxides are discharged from the converter (). The stored quantity of nitrogen oxides is determined during the first operating phase. In order to be able to determine start and end of the second operating phase as accurately as possible, a quantity, which characterizes the discharge quantity of nitrogen oxides, is determined during the second operating phase and compared to the stored quantity of nitrogen oxides determined during the first operating phase. With the comparison, a plausibility check and a calibration of the output signal of a nitrogen oxide (NOx) sensor () can take place. The nitrogen oxide (NOx) sensor () is disposed downstream of the storage catalytic converter ().

Method for operating a nitrogen oxide (nox) storage catalyst

A method for operating a nitrogen oxide (NOx) storage catalytic converter () of an internal combustion engine () includes storing nitrogen oxides (NOx), which are generated by the engine (), in a first operating phase in the NOx storage catalytic converter (). In a second operating phase, nitrogen oxides stored in the NOx storage catalytic converter () are discharged from the NOx storage catalytic converter (). The start of the second operating phase is determined based on a nitrogen oxide (NOx) fill level (mnosp) of the NOx storage catalytic converter () and the NOx fill level (mnosp) is modeled based on a nitrogen oxide (NOx) storing model (). To be able to precisely and reliably determine the start and the end of the second operating phase, a first value of the nitrogen oxide (NOx) mass flow (msnonk_s) rearward of the NOx storage catalytic converter () is detected and the NOx storing model () is corrected in dependence upon the detected first value.

Method and controller for operating a nitrogen oxide (NOx) storage catalyst

A method detects mass flows to the intake manifold of an internal combustion engine having a device for controlling the air supply to the intake manifold and having a sensor for detecting the intake manifold pressure and having a control apparatus for evaluating a trace of the intake manifold pressure. In the context of the method, when the internal combustion engine is switched off, the supply of air to the intake manifold is reduced in a predetermined manner and the trace of the intake manifold pressure, which adjusts thereupon, is evaluated for detecting the mass flows.

Method for determining mass flows into the inlet manifold of an internal combustion engine

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Hemmingen, Germany

Eberhard Schnaibel