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Method for detecting misfires of an internal combustion engine and device for carrying out the method

  • US 7,280,906 B2
  • Filed: 11/12/2004
  • Issued: 10/09/2007
  • Est. Priority Date: 11/14/2003
  • Status: Expired due to Fees
First Claim
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1. A method for detecting combustion misfires in an internal combustion engine, in which a lambda signal made available by at least one lambda sensor is evaluated, the method comprising:

  • providing a broadband lambda sensor as the lambda sensor;

    comparing the lambda signal made available by the broadband lambda sensor to a lambda signal threshold value;

    specifying the lambda signal threshold value at an air ratio lambda greater than 1 in a range of lean combustion; and

    making available a warning signal in response to an exceeding of the lambda signal threshold value in a direction of lean combustion, wherein the warning signal is made available if an enrichment limit of a lambda controller is increased, and if, thereupon, the lambda signal returns to an admissible range.

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