Method for detecting knocking
First Claim
1. A method for knock detection in an internal combustion engine, having at least one knock sensor and an evaluation device connected to said at least one knock sensor, wherein said evaluation device includes at least one comparison means which compares an output signal of the knock sensor to a variable reference level, wherein said variable reference level is produced as a function of preceding output signals of the knock sensor, wherein the variable reference level is supplied to the comparison means via a low-pass filter and the comparison means detects knocking depending on a comparison result, characterized in that tracking of the reference level takes place according to at least two different methods, wherein one of said at least two different methods is selected depending on whether dynamics are detected or not.
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Abstract
A method for knock detection in an internal combustion engine is disclosed, in which the output signal of at least one knock sensor, which is associated with the engine, is evaluated with the aid of an evaluation device. Knocking is detected when the prepared signal of the knock sensor exceeds a predeterminable reference level. The calculation of the input signal of the reference level tracking takes place as a function of whether the internal combustion engine is in a dynamic operating state or not, wherein in order to calculate the reference level in the event of dynamics, measurement values are also used which were determined when knocking was detected.
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Citations
5 Claims
- 1. A method for knock detection in an internal combustion engine, having at least one knock sensor and an evaluation device connected to said at least one knock sensor, wherein said evaluation device includes at least one comparison means which compares an output signal of the knock sensor to a variable reference level, wherein said variable reference level is produced as a function of preceding output signals of the knock sensor, wherein the variable reference level is supplied to the comparison means via a low-pass filter and the comparison means detects knocking depending on a comparison result, characterized in that tracking of the reference level takes place according to at least two different methods, wherein one of said at least two different methods is selected depending on whether dynamics are detected or not.
Specification