Device and method for cylinder-torque equalization of an internal combustion engine, computer program, computer program product

An apparatus for diagnosing an internal combustion engine, in which a cylinder includes a combustion chamber, a fuel quantity and a fresh air quantity being supplied to the combustion chamber for combustion to generate a torque contribution of the cylinder, which torque contribution is, in a first operating mode of the internal combustion engine, essentially a function of the fresh air quantity supplied, and, in a second operating mode of the internal combustion engine, essentially a function of the fuel quantity supplied, the apparatus comprising:

• a first ascertainment device which is configured to ascertain a first variable characterizing the smooth running of the internal combustion engine in the first operating mode;
• a second ascertainment device which is configured to ascertain a second variable characterizing the smooth running of the internal combustion engine in the second operating mode;
• a comparator device which is configured to compare the first variable to the second variable;
• and
• a calculating device which is configured to diagnose the internal combustion engine as a function of the result of the comparison, wherein an erroneously supplied fresh air quantity is recognized if a third variable, that is a function of the absolute amount of the difference between the first variable and the second variable, is greater than a specified value.

A non-transitory computer-readable data storage medium on which are stored instructions that are executable on a computer, and which, when executed on the computer, performs a method for diagnosing an internal combustion engine, in which a cylinder includes a combustion chamber, a fuel quantity and a fresh air quantity being supplied to the combustion chamber for the combustion to generate a torque contribution of the cylinder, which torque contribution is, in a first operating mode of the internal combustion engine, essentially a function of the fresh air quantity supplied, and, in a second operating mode of the internal combustion engine essentially a function of the fuel quantity supplied, the method comprising:

• ascertaining a first variable characterizing a smooth running of the internal combustion engine in the first operating mode
• ascertaining a second variable, characterizing the smooth running of the internal combustion engine in the second operating mode;
• comparing the first variable to the second variable;
• diagnosing of the internal combustion engine as a function of the result of the comparison;
• and
• recognizing an erroneously supplied fresh air quantity if a third variable, that is a function of the absolute amount of the difference between the first variable and the second variable, is greater than a specified value.