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Method for detecting knocking

  • US 6,591,660 B1
  • Filed: 07/19/2001
  • Issued: 07/15/2003
  • Est. Priority Date: 09/28/1999
  • Status: Expired due to Term
First Claim
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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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