Patent ID: 11867593
Assignee: ROBERT BOSCH GMBH
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 10:
11. A training device configured to train an anomaly detection device, the training device configured to:
provide a plurality of sensor recordings of a technical system or of a technical system having the same design or of a similar technical system;
train a first anomaly detection model based on the plurality of sensor recordings; and
train a plurality of second anomaly detection models, each of the second anomaly detection model corresponding to a sensor recording of the plurality of sensor recordings and being trained based on the other sensor recordings of the plurality of sensor recordings;
wherein the anomaly detection device is configured to detect anomalies in a second plurality of sensor recordings of the technical system, the device configured to:
ascertain a first anomalous value which, with regard to all sensor recordings of the second plurality of sensor recordings, characterizes whether or not an anomaly is present, wherein the first anomalous value is a first probability or first probability density value, wherein the first probability or first probability density value characterizes how probable a joint occurrence of all sensor recordings of the second plurality of sensor recordings is;
ascertain a plurality of second anomalous values, each second anomalous value from the plurality of second anomalous values corresponding to a different respective sensor recording of the second plurality of sensor recordings, and with regard to the respective sensor recording characterizing whether or not an anomaly is present in other sensor recordings of the second plurality of sensor recordings, the second anomalous value being a second probability or second probability density value, the second probability or second probability density value characterizing how probable an occurrence of the second plurality of sensor recordings except for the respective sensor recording is;
detect an anomaly in a sensor recording of the second plurality of sensor recordings when all of: i) the first anomalous value characterizes the presence of an anomaly, and ii) the second anomalous value corresponding to the sensor recording characterizes no anomaly, and iii) the second anomalous value corresponding to the sensor recording differs beyond a predefined extent from other second anomalous values of the plurality of second anomalous values;
generate an activation signal based on the detected anomaly; and
activate an actuator or display device of the technical system using the activation signal;
wherein the first anomalous value is ascertained using the first anomaly detection model; and
wherein the plurality of second anomalous values are ascertained using the plurality of second anomaly detection models.