Abstract: A method for adapting the adaptation values for the adaptation of fuel injection quantities of an internal combustion engine, to which fuel is supplyable via a mixed operation of two injection types, a first adaptation value for adapting a first injection quantity specification according to which the internal combustion engine is operated by a first injection type, and a second adaptation value for adapting a second injection quantity specification according to which the internal combustion engine is operated by a second injection type, the adaptation values being each adapted in defined, not overlapping adaptation ranges as a function of the operating state, at least one of the adaptation ranges including operating states in which fuel is supplied to the internal combustion engine via both injection types.

Abstract: A method for adapting a mixture for a pilot control process for setting a fuel/air mixture for operating an internal combustion engine. The method includes determining a current measuring point from an air and fuel quantity in which a predefined lambda is achieved, determining a current operating range in which the measuring point lies, determining a deviation of the measuring point from the operating point lying in the current operating range, determining a corrected operating point between the operating point and the measuring point, and determining corrected parameters of a parameterized relationship from the corrected operating point and the operating points and parameter values of the preceding adaptation step not lying in the current operating range, and permits adaptation of a mixture without separation of load/rotational speed ranges for adaptation of the offset and of the factor of the linear relationship of air quantity and fuel quantity.

Abstract: A method for checking the function of an engine system having an internal combustion engine includes: (a) ascertaining a first charge adaptation value for acting on a manipulated variable for setting an air supply to the internal combustion engine, and ascertaining a first mixture adaptation value for acting on a manipulated variable for setting a fuel supply at a predefined first operating point of the internal combustion engine, in each case with the aid of a predefined adaptation method; and (b) establishing that an error is present in the engine system when at least one of the offset adaptation values is outside a particular predefined adaptation value range.

Abstract: A method for adapting the adaptation values for the adaptation of fuel injection quantities of an internal combustion engine, to which fuel is supplyable via a mixed operation of two injection types, a first adaptation value for adapting a first injection quantity specification according to which the internal combustion engine is operated by a first injection type, and a second adaptation value for adapting a second injection quantity specification according to which the internal combustion engine is operated by a second injection type, the adaptation values being each adapted in defined, not overlapping adaptation ranges as a function of the operating state, at least one of the adaptation ranges including operating states in which fuel is supplied to the internal combustion engine via both injection types.

Abstract: The invention deals with a method for operating an internal combustion engine with engine oil as the lubricant, wherein a fuel mass flow outgassing from the engine oil is ascertained and is taken into account via a map-based pilot control during the metering of a quantity of fuel supplied to the internal combustion engine and wherein a fuel/air ratio supplied to the internal combustion engine is determined. Provision is made in the method according to the invention for a mass flow offset determined from the deviation of the fuel/air ratio supplied to the internal combustion engine from a nominal value to be taken into account when the metering of the quantity of fuel supplied to the internal combustion engine occurs during an effective duration of the map-based pilot control.

Abstract: A method for adapting a mixture for a pilot control process for setting a fuel/air mixture for operating an internal combustion engine. The method includes determining a current measuring point from an air and fuel quantity in which a predefined lambda is achieved, determining a current operating range in which the measuring point lies, determining a deviation of the measuring point from the operating point lying in the current operating range, determining a corrected operating point between the operating point and the measuring point, and determining corrected parameters of a parameterized relationship from the corrected operating point and the operating points and parameter values of the preceding adaptation step not lying in the current operating range, and permits adaptation of a mixture without separation of load/rotational speed ranges for adaptation of the offset and of the factor of the linear relationship of air quantity and fuel quantity.

Abstract: A method for checking the function of an engine system having an internal combustion engine includes: (a) ascertaining a first charge adaptation value for acting on a manipulated variable for setting an air supply to the internal combustion engine, and ascertaining a first mixture adaptation value for acting on a manipulated variable for setting a fuel supply at a predefined first operating point of the internal combustion engine, in each case with the aid of a predefined adaptation method; and (b) establishing that an error is present in the engine system when at least one of the offset adaptation values is outside a particular predefined adaptation value range.

Abstract: The invention deals with a method to determine the fuel composition of a fuel mixture from a first fuel and a second fuel for the operation of an internal combustion engine, wherein the first and the second fuel have different octane numbers and wherein the internal combustion engine has at least one knock sensor and a closed-loop knock control. Provision is made according to the invention for the composition of the fuel mixture to be determined by means of an output signal of the knock sensor. Provision is made in many cases for the knock sensor to already be in the internal combustion engine, so that it does not present any additional expenditure of money or effort. Because the octane number of the fuel mixture is determined by the mixing ratio of the fuels involved, which have different octane numbers, in retrospect the composition of the fuel mixture can be suggested from the signal of the knock sensor under suitable operating conditions.

Abstract: The invention relates to a method for the open-loop control of an internal combustion engine, which is operated with a fuel blend of an initial and at least one second fuel, the internal combustion engine having a fuel metering system, a tank fill-level gauge for determining the tank content and a change in the tank content, a sensor for the detection of the cylinder charge for determining an air mass supplied to the internal combustion engine and at least one exhaust gas probe for determining and controlling the oxygen content in the exhaust gas in a closed-loop. According to the invention, two methods, which are independent from each other, are used for determining the composition of the fuel blend.

Abstract: The invention relates to a method for operating an internal combustion engine, which can be operated with fuels and fuel mixtures of said fuels, said fuels differing from each other in the air quantity they require for a stoichiometric combustion. A fuel quantity to be supplied to the internal combustion engine is corrected via a mixture adaptation and a fuel adaptation, the mixture adaptation and the fuel adaptation being based on a lambda control and a fuel quantity contained in the fuel reservoir of the internal combustion engine prior to refueling and a fuel quantity supplied to the reservoir being determined.

Abstract: The invention relates to a method for the open-loop control of an internal combustion engine, which is operated with a fuel blend of an initial and at least one second fuel, the internal combustion engine having a fuel metering system, a tank fill-level gauge for determining the tank content and a change in the tank content, a sensor for the detection of the cylinder charge for determining an air mass supplied to the internal combustion engine and at least one exhaust gas probe for determining and controlling the oxygen content in the exhaust gas in a closed-loop. According to the invention, two methods, which are independent from each other, are used for determining the composition of the fuel blend.

Abstract: In a method for operating an internal combustion engine, a sensor for detecting and/or an actuator for setting a performance quantity of the internal combustion engine is/are monitored for the presence of a malfunction. Monitoring is performed at a first operating point of the internal combustion engine at a lower load and at an operating point of the internal combustion engine at a higher load. The two operating points are set alternatingly, and at least one of the two operating points is set multiple times for a single monitoring operation.

Abstract: The invention deals with a method for operating an internal combustion engine with engine oil as the lubricant, wherein a fuel mass flow outgassing from the engine oil is ascertained and is taken into account via a map-based pilot control during the metering of a quantity of fuel supplied to the internal combustion engine and wherein a fuel/air ratio supplied to the internal combustion engine is determined. Provision is made in the method according to the invention for a mass flow offset determined from the deviation of the fuel/air ratio supplied to the internal combustion engine from a nominal value to be taken into account when the metering of the quantity of fuel supplied to the internal combustion engine occurs during an effective duration of the map-based pilot control.

Abstract: The invention deals with a method to determine the fuel composition of a fuel mixture from a first fuel and a second fuel for the operation of an internal combustion engine, wherein the first and the second fuel have different octane numbers and wherein the internal combustion engine has at least one knock sensor and a closed-loop knock control. Provision is made according to the invention for the composition of the fuel mixture to be determined by means of an output signal of the knock sensor. Provision is made in many cases for the knock sensor to already be in the internal combustion engine, so that it does not present any additional expenditure of money or effort. Because the octane number of the fuel mixture is determined by the mixing ratio of the fuels involved, which have different octane numbers, in retrospect the composition of the fuel mixture can be suggested from the signal of the knock sensor under suitable operating conditions.

Abstract: In a method for operating an internal combustion engine, a sensor for detecting and/or an actuator for setting a performance quantity of the internal combustion engine is/are monitored for the presence of a malfunction. Monitoring is performed at a first operating point of the internal combustion engine at a lower load and at an operating point of the internal combustion engine at a higher load. The two operating points are set alternatingly, and at least one of the two operating points is set multiple times for a single monitoring operation.