Method and device for controlling knocking in an internal combustion engine

A method for controlling knocking in an internal combustion engine, the method comprising the following steps:

• measuring, by a knock sensor, knock signals of a cylinder;
• generating, from the knock signals, knock features;
• comparing the knock features to a reference level;
• and
• classifying a combustion as a knocking combustion or non-knocking combustion, based on the comparing;
• wherein the reference level is formed taking in consideration a plurality of corrected knock features, the corrected knock features being formed from the knock features by determining map values from a program map as a function of operating parameters of the internal combustion engine, linking the map values additively to the knock features, and carrying out a low-pass filtering;
• wherein further map values are determined from a further program map as a function of the operating parameters of the internal combustion engine and are used multiplicatively to form the corrected knock features;
• wherein, to form the corrected knock features, the map values are subtracted from the knock features, results of the subtraction are then low-pass-filtered, multiplication with the further map values is then carried out, and the map values are then added on again to form the corrected knock features.

A device for controlling knocking in an internal combustion engine, knock signals of a cylinder of the internal combustion engine being measured by a knock sensor, the device configured to:

• receive the knock signal from the knock sensor;
• generate, from the knock signal, knock features;
• compare the knock features to a reference level;
• classify combustion as a knocking or non-knocking combustion based on the comparison;
• wherein the device is configured to form the reference level by taking into consideration a plurality of corrected knock features, and the device is configured to form the corrected knock features from the knock features by:
• (i) determining map values from a program map as a function of operating parameters of the internal combustion engine, and linking the map values additively to the knock features, or (ii) carrying out a low-pass filtering, or (iii) determining map values from a program map as a function of the operating parameters of the internal combustion engine and linking the determined map values additively to the knock features, and carrying out a low-pass filtering;
• wherein the device is configured to determine further map values from a further program map as a function of the operating parameters of the internal combustion engine and the further map values are used multiplicatively to form the corrected knock features;
• wherein, to form the corrected knock features, the map values are subtracted from the knock features, results of the subtraction are then low-pass-filtered, the map values are then being added on again, and multiplication with the further map values is then carried out to form the corrected knock features.

A device for controlling knocking in an internal combustion engine, knock signals of a cylinder of the internal combustion engine being measured by a knock sensor, the device configured to:

• receive the knock signal from the knock sensor;
• generate, from the knock signal, knock features;
• compare the knock features to a reference level;
• classify combustion as a knocking or non-knocking combustion based on the comparison;
• wherein the device is configured to form the reference level by taking into consideration a plurality of corrected knock features, and the device is configured to form the corrected knock features from the knock features by:
• (i) determining map values from a program map as a function of operating parameters of the internal combustion engine, and linking the map values additively to the knock features, or (ii) carrying out a low-pass filtering, or (iii) determining map values from a program map as a function of the operating parameters of the internal combustion engine and linking the determined map values additively to the knock features, and carrying out a low-pass filtering;
• wherein the device is configured to determine further map values from a further program map as a function of the operating parameters of the internal combustion engine and the further map values are used multiplicatively to form the corrected knock features;
• and
• wherein, to form the corrected knock features, the map values are subtracted from the knock features, results of the subtraction are then low-pass-filtered, multiplication with the further map values is then carried out, and the map values are then added on again to form the corrected knock features.