Robert Boschgmbh

Robert Bosch Gbmh

Jens Wolber

Markus Amler

Thomas Frenz

Klaus Joos

Hansjoerg Bochum

Ruediger Weiss

Timm Hollmann

Karsten Hinn

Helmut Rembold

Christian Koehler

Karsten Kroepke

Matthias Walz

Laurent Nack

Christian Wiedmann

Uwe Mueller

Oliver Albrecht

Pierre-Yves Crepin

Edmund Schaut

Martin Streib

Karl Gmelin

Guido Porten

Winfried Langer

Bernd Schroeder

Peter Ropertz

Andreas Baumann

Norbert Mueller

Matthias Schumacher

Frank Mueller

Matthias Kuesell

Manfred Kirschner

Klaus Lang

Peter Schenk

Kersten Wehmeier

Juergen Pantring

Detlef Heinrich

Joerg Koenig

Gerd Grass

Karl-Bernhard Lederle

Ingo Richter

Mathias Rollwage

Manfred Dietrich

Bernd Roos

Klaus-Dieter Hufnagel

Helmut Zell

Jan-Mathias Meng

Volkmar Goldschmitt

Mathias Schumacher

Emilie Hincker-Piocelle

Erkan Danisman

Oliver Wiemers

Marcel Matischok

Wolfgang Saatmann

Hans-Peter Harnisch

Marc Schott

Hans-Juergen Baehr

Stefan Smetana

In a method for controlling a fuel injection system () of an internal combustion engine, wherein the fuel injection system () comprises a manifold () and a high-pressure pump () and a fuel dosing unit () is associated with the high-pressure pump (), wherein the fuel dosing unit () controls the amount of fuel delivered, an amount of fuel required for the operation of the internal combustion engine is determined as a function of a correction factor, which is based on a fuel pressure at the inlet of the high-pressure pump () and/or on a vapor pressure of the fuel to be delivered.

Method for controlling a fuel injection system of an internal combustion engine

The aim of the invention is to optimize the running smoothness of an internal combustion engine. To achieve this aim, the individual cylinders are synchronized with respect to their torque contribution. According to the method, fuel is injected into the combustion chamber of a cylinder in at least one injection step, the at least one injection contributing to the torque of the internal combustion engine. Fuel is injected into the combustion chamber of the cylinder in a torque neutral manner by way of a secondary injection during a working stroke of the cylinder and the amount of fuel of the secondary injection us calculated in such a manner that the exhaust gas substantially corresponds to a stoichiometric air/fuel mixture.

Method for cylinder synchronization of an internal combustion engine

The invention deals with a method for the operation of an internal combustion engine with at least two cylinders, which can be operated with a fuel of variable quality stored in a tank and/or with fuel blends stored in the tank from a first and at least a second fuel in variable mixing ratios, and wherein variable fuel qualities and/or fuel blends of different compositions require variable air/fuel ratios for the achievement of a stable combustion and/or have a variable vaporization behavior. Provision is, thereby, made for a variation, which is individually adjusted to each cylinder, of the quantity of fuel delivered to the cylinder to be implemented to supply a lean and/or to a rich air/fuel mixture at least one cylinder, for the effect of the variation on the starting characteristics and/or the running smoothness of the cylinder and/or the internal combustion engine to be evaluated and when an improvement in the starting characteristics and/or the running smoothness is achieved, for a fuel adaptation to be implemented for all cylinders. The method makes the quick detection and the avoidance of starting problems possible, when a change in the fuel quality or in the fuel composition occurs with an effect on the ignitability of the fuel.

Method for the operation of an internal combustion engine

The invention relates to a procedure to heat up or keep warm an exhaust gas emission control assembly of a vehicle with a drive train containing one transmission. The drive train is powered by an internal combustion engine and at least one second drive unit. It is proposed that also in an operating state, which lies outside of the idle speed, a rotational speed or a torque of the internal combustion engine deviating from values for the engine rotational speed and the torque is set, which would exist during an identical driving condition without the heating-up or keeping warm of the exhaust gas emission control assembly.

Procedure for heating-up and keeping warm an emission control assembly of a motor vehicle

A method for starting an internal combustion engine that is operated with a fuel mixture made of at least two types of fuel. An injection of the fuel into combustion chambers of the internal combustion engine occurs starting at a predefined pressure threshold of the fuel in a fuel supply according to a high-pressure starting mode, and also according to a low-pressure starting mode if the predefined pressure threshold is no longer met. The pressure threshold is selected as a function of the mixture ratio of the fuel types in the fuel mixture. In this way it can be achieved that differences can be taken into consideration in the optimal mixture formation of the fuel types.

Method for fuel injection

In a method and a device for operating an injection device () for an internal combustion engine, the injection device () includes injection valves (), via which fuel is injected directly into combustion chambers () of the internal combustion engine. Mechanisms are provided for detecting misfirings (), and for determining a fuel pressure (). A mechanical fault of an injection valve () is detected when a misfire occurs in a cylinder () and the fuel pressure simultaneously drops below a threshold value (SW). An electrical fault in an injection device () is detected when misfirings of cylinders () assigned to an output stage bank of the injection device () are observed, and the fuel pressure has dropped below a threshold value (SW). The responses to the faults that are implemented differ depending on the faults that were detected.

Method and device for monitoring a fuel injection device for an internal combustion engine

A fuel system for an internal combustion engine includes at least one first fuel pump and a pressure region into which the fuel pump pumps and which communicates with an elastic volume reservoir. The elastic volume reservoir has a characteristic pressure/volume curve, which is defined by at least two points. It is proposed that a first point is defined by a first volume at a first pressure that is somewhat greater than a vapor pressure of the fuel at ambient temperature, and that a second point is defined by a second volume and a second pressure in the pressure region that corresponds to a maximum pressure; the difference between the first and second volumes corresponds at least approximately and at least to a value by which the volume of the fuel in the pressure region decreases upon cooling down from a maximum temperature to ambient temperature.

Fuel system, especially of the common rail type, for an internal combustion engine

A method for operating an internal combustion engine having a fuel pump with a drive shaft is provided, the fuel pump conveying fuel into at least one fuel-collection line, the fuel being subsequently conveyed to at least one combustion chamber via at least one fuel-injection device. In the method, a quantity of the fuel conveyed by the fuel pump into the fuel-collection line is set by means of a valve device. The valve device is configured to selectively connect a discharge side of the fuel pump to a low-pressure region of the fuel pump (during deactivation phase), and selectively disconnect the discharge side from the low-pressure region (during supply phase). In supplying the quantity of fuel, a supply rate, defined as the number of supply phases of the fuel pump per rotation of the drive shaft, is determined as a function of at least one operating parameter of the internal combustion engine.

Method for operating an internal combustion engine

A fuel system for an internal combustion engine includes a delivery unit and a pressure region into which the delivery unit feeds; the fuel system includes at least one heater and a control unit, which activates the heater when the delivery unit is switched off so that the pressure in the pressure region does not fall below a limit pressure.

Fuel system for an internal combustion engine

A procedure to recognize a depressurized fuel system of a motor vehicle with an internal combustion engine that includes a parameter characterizing the fuel system temperature is acquired when turning off the internal combustion engine; a parameter characterizing the fuel system temperature is acquired in the immediately subsequent driving cycle when starting the internal combustion engine; and from the difference between the shut-down temperature and the starting temperature, the pressure in the fuel system is inferred.

Procedure to recognize a depressurized fuel system

An internal combustion engine is operated according to a method, in which the fuel is pumped from a first fuel pump to a second fuel pump and from there into a high-pressure region. The fuel passes therefrom into at least one combustion chamber of the internal combustion engine, by means of at least one fuel injection device. In certain operating conditions of the internal combustion engine, the pressure in the high-pressure region is lowered by means of a release device. According to the invention, the reliability and security of operating the internal combustion engine may be increased by monitoring the functioning of the release device (through).

Method, computer program, control and/or regulation device for operation of an internal combustion engine and fuel system for an internal combustion engine

A method for operating a fuel-supply system for an internal combustion engine of a motor vehicle is provided, the fuel-supply system having a fuel-storage tank, a fuel pump and a pressure sensor, the fuel pump supplying fuel from the fuel-storage tank to a pressure region, the pressure sensor being arranged in the pressure region, and the pressure sensor generating a signal representing the pressure in the pressure region.

Method for operating a fuel supply system for an internal combustion engine in a motor vehicle

A method for operating an internal combustion engine, in particular of a motor vehicle including at least one fuel pump delivers the fuel from a fuel tank into a fuel line. The pressure of the fuel, at least in a region of the fuel line, is increased as a function of an operating state. In order to assure a reliable starting of the engine, the pressure of the fuel, at least In the above-mentioned region of the fuel line is at least intermittently increased when the engine is not running.

Method, computer program and control and/or regulation device for operating an internal combustion engine, and corresponding internal combustion engine

In an internal combustion engine, the fuel is conveyed by an electrically driven fuel pump. The intake side of this pump is connected to a fuel tank and its outlet side is connected to a pressure region. A prerun of the electrically driven fuel pump may be performed before the startup of the internal combustion engine. In order to increase the service life of the fuel pump, an actual pressure (pactual) in the pressure region may be detected by a pressure sensor and the execution of the prerun be a function of at least the signal of the pressure sensor.

Method, computer program control and regulating unit for operating an internal combustion engine, as well as an internal combustion engine

In an internal combustion engine, the fuel reaches the combustion chamber of the engine via a fuel-injection device which includes a piezo actuator (). In order to be able to optimally inject the fuel, it is suggested that the desired level (U_DES) of the drive energy (U) and/or the desired gradient (dU_DES) of the drive energy (U), with which the piezo actuator () is driven, is dependent upon a plurality of influence quantities (T, t, n, dx, dh) which influence the operating behavior of the piezo actuator ().

Internal combustion engine and method, computer program and control apparatus for operating the internal combustion engine

Growing community of inventors

Gerlingen, Germany

Jens Wolber