Method and device for ascertaining a closure point in time of an injector of an internal combustion engine with the aid of a machine learning system

A control system configured to ascertain a closure point in time of an injector of an internal combustion engine with the aid of a classifier, the control system configured to:

• ascertain a time series of input signals, each of the input signals corresponding to a point in time within the time series, and each of the input signals characterizing a deformation of the injector;
• ascertain a plurality of first values using the classifier based on the time series of input signals, each of the first values corresponding to a point in time of the time series, and each of the first values characterizing a probability that the closure point in time of the injector matches the point in time corresponding to the first value;
• ascertain a plurality of second values, each second value of the second values being a sum of neighboring first values of a first value of the first values and the first value, the neighboring first values being ascertained based on the points in time corresponding to the first values, and the second value corresponding to the point in time to which the first value corresponds;
• and
• ascertain the closure point in time based on a largest second value of the plurality of second values.

A non-transitory machine-readable memory medium on which is stored a computer program for ascertaining a closure point in time of an injector of an internal combustion engine with the aid of a classifier, the computer program, when executed by a processor, causing the processor to perform the following steps:

• ascertaining a time series of input signals, each of the input signals corresponding to a point in time within the time series, and each of the input signals characterizing a deformation of the injector;
• ascertaining a plurality of first values using the classifier based on the time series of input signals, each of the first values corresponding to a point in time of the time series, and each of the first values characterizing a probability that the closure point in time of the injector matches the point in time corresponding to the first value;
• ascertaining a plurality of second values, each second value of the second values being a sum of neighboring first values of a first value of the first values and the first value, the neighboring first values being ascertained based on the points in time corresponding to the first values, and the second value corresponding to the point in time to which the first value corresponds;
• and
• ascertaining the closure point in time based on a largest second value of the plurality of second values.