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US 2019/0195150 A1Published application
Method and device for knock control of an internal combustion engine
AssigneeRobert Bosch GmbH
InventorsCarsten Kluth, Matthias Biehl
Life of this patent
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Abstract
A method and a device for knock control of an internal combustion engine, a knock signal of a cylinder of the internal combustion engine being measured by a knock sensor and, on the basis thereof, a knock intensity is generated. The knock intensity is compared to a reference level in order to classify a combustion as a knocking or non-knocking combustion. Moreover, an arrangement is provided, which takes the level of the knock intensity into account for the determination of the reference level.
Claims7
A method for knock control of an internal combustion engine, the method comprising:
- measuring, by a knock sensor, a knock signal of a cylinder of the internal combustion engine and generating, based on the measuring, a present knock intensity;
- comparing the present knock intensity to a present reference level to classify a present combustion as a knocking or non-knocking combustion, the present reference level having been determined for the present combustion using knock intensities of preceding combustions, a level of the present knock intensity being taken into account for the determination of the present reference level;
- forming a present comparison value by the comparison of a present knock intensity to a present reference value;
- when the present comparison value remains below a first knock detection threshold, the present combustion is classified as a non-knocking combustion and the present reference value for a next combustion results from the present reference value and the present knock intensity multiplied by a first adjustment factor;
- when the present comparison value exceeds the first knock detection threshold and remains below a second knock detection threshold, the present combustion is classified as a non-knocking combustion and the present reference value for the next combustion results from the present reference value and the present knock intensity multiplied by a second adjustment factor;
- and
- when the present comparison value exceeds the first knock detection threshold and exceeds the second knock detection threshold, the present combustion is classified as a knocking combustion and the present reference value for the next combustion results from the present reference value and the present knock intensity multiplied by a third adjustment factor.
4 more elements
A device for knock control of an internal combustion engine, comprising:
- a knock sensor configured to measure a knock signal of a cylinder of the internal combustion engine and to generate, based on the knock signal, a present knock intensity;
- an arrangement configured to compare the present knock intensity to a present reference level to classify a present combustion as a knocking or non-knocking combustion, the arrangement configured to determine the present reference level taking into account a level of the knock intensity, and to form a present comparison value by comparing the present knock intensity to the present reference value;
- when the present comparison value remains below a first knock detection threshold, the arrangement is configured to classify the present combustion as a non-knocking combustion and to form the present reference value for a next combustion from the present reference value and the present knock intensity multiplied by a first adjustment factor;
- when present comparison value exceeds the first knock detection threshold and remains below a second knock detection threshold, the arrangement is configured to classify the present combustion as non-knocking combustion and to form the present reference value for the next combustion from the present reference value and the present knock intensity multiplied by a second adjustment factor;
- when the present comparison value exceeds the first knock detection threshold and exceeds second knock detection threshold, the arrangement is configured to classify the present combustion as a knocking combustion and to form the present reference value for the next combustion from the present reference value and the present knock intensity multiplied by a third adjustment factor.
2 more elements
Dependencies are inferred from the claim text.