Robert Boschgmbh

Gerd Grass

Ruediger Weiss

Klaus Joos

Hansjoerg Bochum

Ralf Daeubel

Edmund Schaut

Markus Amler

Jens Wolber

Werner Mezger

Andreas Roth

Karl Ott

Thomas Schuster

Bernd Roos

Peter Klee

Lilian Kaiser

A first method is for determining a variable, which characterizes a fuel injection, in an internal combustion engine of a motor vehicle in a hot-start situation wherein fuel is injected directly into at least one combustion chamber from a high-pressure region of a fuel supply system; the variable, which characterizes the injection quantity, is corrected at least in dependence upon a variable which represents a temperature of the fuel. A second method is for determining a hot-start situation in an internal combustion engine of a motor vehicle wherein a hot-start situation is determined at least based on a variable, which represents a temperature of the fuel, and based on a fuel pressure. The invention relates likewise to corresponding arrangements, a corresponding control apparatus for an internal combustion engine, a corresponding computer program having program-code means and a corresponding computer program product having program-code means.

Methods and device for controlling an internal combustion engine

A method for detecting a hot start situation in an internal combustion of a motor vehicle includes the steps of determining a gradient of a temperature variation of an engine temperature; and detecting a hot start situation based on the determined gradient of a temperature variation of an engine temperature. An appropriate electronic control unit for an internal combustion engine is provided, as well as an appropriate computer program with a program code mechanism, and an appropriate computer program product with a program code mechanism.

Method for determining a hot-start situation in an internal combustion engine

A method and a control unit are proposed for checking the performance reliability of a timer that is arranged outside of the control unit, used in particular for controlling an internal combustion engine, and that supplies time information to the control unit, further time information being generated internally in the control unit and being compared to corresponding time information supplied by the external timer. Because an internal time meter is started in the control unit and the comparison of the time information supplied by the external timer and by the internal time meter is carried out at arbitrarily specifiable points of time, a malfunction of the external timer can be determined during the entire operating time, and furthermore, a deviation can be calculated with higher accuracy.

Method and device for checking the performance reliability of a timer

An internal combustion engine, especially of a motor vehicle, is described wherein fuel can be injected into an intake manifold or into a combustion chamber during warm up. A control apparatus is provided for determining a warm-up factor (fWL) for increasing the injected fuel quantity below an operating temperature of the engine. With the control apparatus, the warm-up factor (fWL) is determined from a base factor (fG) and a load-dependent factor (fLA).

Method for warming-up an internal combustion engine

A method is provided for operating a spark ignition internal combustion engine having fuel injection at a cold start. The method retards the spark angle to a cold start value at least for the first combustion in at least one cylinder of the internal combustion engine during a cold start phase, the fuel injected into the cylinder being brought to combustion, and the method sets the spark angle to normal, to end the cold start phase.

Method for operating an otto-cycle internal combustion engine with fuel injection on a cold start

The invention is directed to a method of starting an engine for internal combustion engines of a motor vehicle driven by gasoline direct injection with the engines being subdivided into several cylinder banks and a high pressure injection system being provided for each cylinder bank. During a first phase (A), an injection into the cylinders of a first cylinder bank in correspondence to their normal ignition sequence takes place and no injection is carried out in the cylinders of the remaining cylinder banks. In a subsequent second phase (B), injection takes place also into the cylinders of the other cylinder bank or banks.

Method for starting an internal combustion engine having several cylinder banks and being operated with gasoline direct injection

An internal combustion engine ( ), especially for a motor vehicle, is described, which has a combustion chamber ( ) into which fuel can be injected in at least two operating modes. Each of the injections has an injection start angle and an injection duration. Furthermore, a control apparatus is provided for control (open loop and/or closed loop). An injection end angle can be determined by the control apparatus ( ) from the injection start angle and the injection duration. Likewise, a check can be made by the control apparatus ( ) as to whether an injection interrupt angle is exceeded by the injection end angle.

Method of operating an internal combustion engine

A fuel supply system for an internal combustion engine in a motor vehicle in particular is provided with a control unit for determining a quantity of fuel to be supplied to a cylinder. An injection valve is provided for injecting the quantity of fuel to be supplied. The control unit determines whether combustion has taken place in the cylinder. The quantity of fuel supplied to the cylinder where no combustion has taken place is determined by the control unit.

Fuel supply system for an internal combustion engine in a motor vehicle in particular

A fuel supply system for an internal combustion engine, particularly of a motor vehicle, includes a control unit for determining a fuel quantity to be injected, the fuel quantity to be injected being initially increased during a start of the internal combustion engine and then being reduced again. The fuel supply system also includes a fuel injector for injecting the fuel quantity to be injected into a combustion chamber. It is checked by the control unit whether a combustion has taken place in the cylinder, and, if no combustion has taken place, the fuel quantity to be injected is not reduced, or is not reduced to the same extent as when a combustion has taken place.

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Schwieberdingen, Germany

Gerd Grass