Robert Boschgmbh

Michael Pfeil

Kersten Wehmeier

Karl-Bernhard Lederle

Martin Streib

Michael Fey

Albrecht Clement

Armin Hassdenteufel

Siyun Chu

Andreas Mueller

Peter Schelhas

Andreas Posselt

Marko Lorenz

Andreas Baumann

Dieter Lederer

Manfred Franz

Silke Haag

Nicolas Perrot

The invention relates to a method for adjusting a fuel/air ratio of an internal combustion engine (), comprising a catalyst volume () with a first catalyst partial volume () and a second catalyst partial volume (). The second catalyst partial volume () is arranged downstream from the first catalyst partial volume (). An actual filling level of an exhaust gas constituent in the catalyst volume () is calculated from operating parameters of the internal combustion engine () and the exhaust system () using a computing model, and is adjusted to a nominal value by modifying the fuel/air ratio. The adjustment is carried out first for the second catalyst partial volume () and only later for the first catalyst partial volume ().

Method for adjusting a fuel/air ratio of an internal combustion engine

A method and control device for correcting an output signal of an exhaust gas sensor in an exhaust gas conduit of an internal combustion engine, a secondary air delivery system for delivering air into the exhaust gas conduit being associated with the exhaust gas conduit upstream from the exhaust gas sensor in the flow direction of the exhaust gas. During a measurement of the output signal of the exhaust gas sensor, air is delivered to the exhaust gas conduit via the secondary air delivery system during a correction phase by way of which a correction of the output signal of the exhaust gas sensor is derived. In this operating mode, a defined oxygen content exists in the gas mixture surrounding said sensor, so that the output signal can be compared with reference values.

Method and control device for correcting an output signal of an exhaust gas sensor

A method for the dynamic monitoring of a first lambda probe arranged in an exhaust-gas duct of an internal combustion engine upstream of an exhaust-gas purification system. A period of an output signal of the first lambda probe is determined in a controller of the internal combustion engine, and a lambda regulating signal is determined from an output signal of a second lambda probe connected downstream of the exhaust-gas purification system. A first threshold value for a lengthening of the period of the output signal of the first lambda probe is predefined, in that a characteristic signal () is derived from the lambda regulating signal, in that a second threshold value for an inadmissible deviation of the characteristic signal () is predefined, and in that an inadmissible asymmetric delay of the first lambda probe is inferred if the lengthening of the period exceeds the first threshold value and the characteristic signal () deviates from the second threshold value outside predetermined limits.

Method and device for the dynamic monitoring of a lambda probe

The invention relates to a method and corresponding device for diagnosing the dynamics of an exhaust gas sensor, which is disposed in an exhaust gas duct of an internal combustion engine in the direction of flow of the exhaust gas upstream or downstream of a catalytic converter and with which the air/fuel ratio of the gas mixture supplied to the internal combustion engine is controlled via a control circuit. During diagnosis, provision is made for at least one actuator intervention to be specified by means of a control algorithm of a diagnostic controller specifically m the direction of an asymmetric behavior, which is achieved by an extension of one of the two ramps, until the actuator intervention is compensated by an asymmetric dynamic error of the exhaust gas sensor, a reaction to said actuator intervention being used as criterion for assessing an asymmetric dynamic error of said exhaust gas sensor.

Method and device for diagnosing the dynamics of an exhaust gas sensor

Method and apparatus for detecting tank leaks, in which a gas pressure acts on a fluid which is situated in a tank, and in which the gas pressure in the tank or tank system is changed, wherein a tank leak is detected by evaluation of a temporal profile of a sum pressure of the fluid which is situated in the tank.

Method and apparatus for detecting tank leaks

A method of diagnosing a fuel tank leak in a fuel tank ventilation system, comprising a fuel tank, an accumulator for fuel vapors and a fuel tank ventilation valve opening out into an intake manifold of an internal combustion engine, wherein the fuel tank, the accumulator and the fuel tank ventilation valve are connected by way of a system of lines and wherein the accumulator has an aeration line with a check valve, the method comprising:

Procedure to diagnose a leak in the fuel tank in a fuel tank ventilation system

A method for testing the functionality of a tank system of a motor vehicle having an internal combustion engine, including a controllable tank venting valve connected to an intake manifold and at least one pressure source for testing the tightness of the tank venting system using overpressure or underpressure, the functionality of the tank venting valve being tested via its activation in an opening and/or closing manner during pressurizing the tank system using overpressure or underpressure and by registering and evaluating at least one operating variable of the pressure source. The tank system is pressurized with overpressure or underpressure and the at least one operating variable of the pressure source is registered and evaluated during operation of the engine.

Method for testing the functionality of a tank venting system of a motor vehicle having an internal combustion engine

A method for operating an internal combustion engine, permitting a differentiation between an air error and a fuel error as part of mixture adaptation. In at least one operating state of the internal combustion engine a deviation in an air-fuel mixture ratio from a setpoint value is corrected. For this correction in the at least one operating state the particular deviation in the air-fuel mixture ratio is determined for at least two setpoint values. From these deviations an air error and/or a fuel error is determined.

Method for operating an internal combustion engine

A method of tank leak diagnosis in a tank ventilation device including a fuel tank which is connected at least indirectly through a storage and tank ventilation valve with a suction pipe of an internal combustion engine of the vehicle, with the storage having an aeration conduit with a check valve, includes performing a tank leak diagnosis by a negative pressure after turning off of the internal combustion engine; and producing the negative pressure in the fuel tank immediately before the turning off of the internal combustion engine.

Method of tank leak diagnosis

An arrangement for correcting a signal (S) is suggested which contains a signal evaluation (), which determines a characteristic variable of the input signal (US) of a controller () and/or the actuating variable (fr) of the controller () and/or at least one determined corrective signal (ora, fra) and/or at least one of their mean values (form) and compares the characteristic variable to at least one threshold value (SC1, SC2, SC3) and, when reaching or passing through at least one threshold value (SC1, SC2, SC3), an output signal (A) is made available at the end of the determination of the corrective signal (ora, fra).

Growing community of inventors

Schwieberdingen, Germany

Michael Pfeil