Method for operating an internal combustion engine

A non-transitory computer-readable memory device storing a computer program having program codes, when executed by a controller, causing the controller to perform a method for operating an internal combustion engine, in which at least one first influence variable influences a state variable of air in an intake manifold, wherein the state variable is a mass flow across a throttle valve, the method comprising:

• ascertaining the state variable of air in the intake manifold of the internal combustion engine while taking into account a plurality of influence variables which influence the state variable of the air in the intake manifold, while using a first physical relationship between the state variable of the air and the influence variables;
• ascertaining the state variable while taking into account a plurality of influence variables which influence the state variable of the air in the intake manifold, while using a second physical relationship between the state variable of the air and the influence variables;
• linking to each of the influence variables a specific adjusting parameter which represents a degree of error in the respective influence variable;
• monitoring the adjusting parameters during operation of the internal combustion engine;
• and
• monitoring a certain use of the adjusting parameters in an operating range of the internal combustion engine in which the other adjusting parameters have a lesser influence on the state variable than that the certain adjusting parameter, and in this context, the certain adjusting parameter being adjusted in such a way that the state variable ascertained while using the first physical relationship is at least approximately equal to the state variable ascertained while using the second physical relationship.

A non-transitory electrical storage medium for a control device of an internal combustion engine, the storage medium storing a computer program which, when executed by the control, causing the control to perform a method for operating the internal combustion engine, in which at least one first influence variable influences a state variable of air in an intake manifold, wherein the state variable is a mass flow across a throttle valve, the method comprising:

• ascertaining the state variable of air in the intake manifold of the internal combustion engine while taking into account a plurality of influence variables which influence the state variable of the air in the intake manifold, while using a first physical relationship between the state variable of the air and the influence variables;
• ascertaining the state variable while taking into account a plurality of influence variables which influence the state variable of the air in the intake manifold, while using a second physical relationship between the state variable of the air and the influence variables;
• linking to each of the influence variables a specific adjusting parameter which represents a degree of error in the respective influence variable;
• monitoring the adjusting parameters during operation of the internal combustion engine;
• and
• monitoring a certain use of the adjusting parameters in an operating range of the internal combustion engine in which the other adjusting parameters have a lesser influence on the state variable than that the certain adjusting parameter, and in this context, the certain adjusting parameter being adjusted in such a way that the state variable ascertained while using the first physical relationship is at least approximately equal to the state variable ascertained while using the second physical relationship.

A control device for an internal combustion engine, the control device adapted to perform a method for operating the internal combustion engine, in which at least one first influence variable influences a state variable of air in an intake manifold, wherein the state variable is a mass flow across a throttle valve, the method comprising:

• ascertaining the state variable of air in the intake manifold of the internal combustion engine while taking into account a plurality of influence variables which influence the state variable of the air in the intake manifold, while using a first physical relationship between the state variable of the air and the influence variables;
• ascertaining the state variable while taking into account a plurality of influence variables which influence the state variable of the air in the intake manifold, while using a second physical relationship between the state variable of the air and the influence variables;
• linking to each of the influence variables a specific adjusting parameter which represents a degree of error in the respective influence variable;
• monitoring the adjusting parameters during operation of the internal combustion engine;
• and
• monitoring a certain use of the adjusting parameters in an operating range of the internal combustion engine in which the other adjusting parameters have a lesser influence on the state variable than that the certain adjusting parameter, and in this context, the certain adjusting parameter being adjusted in such a way that the state variable ascertained while using the first physical relationship is at least approximately equal to the state variable ascertained while using the second physical relationship.