Method for Operating a Catalytic Device, Catalytic Device, Internal Combustion Engine, Control Method for Controlling the Internal Combustion Engine, and Motor Vehicle

A method for operating a catalytic device comprising a catalytic converter for an internal combustion engine, wherein in a detection time interval, the method comprises the steps(S) of:

• S1 an active operating mode of the internal combustion engine is detected,
• S2 a lambda value (λ) is detected, and based thereon:
• S3.1 a characteristic map weighting factor is determined,
• S3.2 a first oxygen supply partial value is determined from a characteristic map predetermined for the detected operating mode for λ=1 and offset with the characteristic map weighting factor, from which a first characteristic map-weighted oxygen supply partial value results,
• S3.3 a second oxygen supply partial value (sb) is determined, specifically:
• S3.3.1 if the lambda value (λ) is greater than 1, from a characteristic map predetermined for the detected operating mode for λ>1, or,
• S3.3.2 if the lambda value (λ) is less than 1, from a characteristic map predetermined for the detected operating mode for λ<1,
• S3.4 the second oxygen supply partial value (sb) is offset with the characteristic map weighting factor, from which a second characteristic map-weighted oxygen supply partial value results,
• S4 the characteristic map-weighted oxygen supply partial values are added to an actual oxygen supply value characterizing an actual oxygen supply of the catalytic converter,
• S5 an overall actual oxygen supply value comprising the actual oxygen supply value is detected,
• S6 an actual oxygen amount value is detected, which characterizes an actual oxygen amount currently stored in the catalytic converter,
• S7 based on the overall actual oxygen supply value, the actual oxygen amount value, and a target oxygen amount value, which characterizes a target oxygen amount in the catalytic converter at which the catalytic converter operates at the best possible conversion rate, an oxygen requirement value is determined, which characterizes an oxygen supply to be supplied to the catalytic converter in order to set the target oxygen amount in the catalytic converter, and
• S8 the oxygen requirement value of the detection time interval is provided.