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Method for recognizing abnormal combustions in the cylinder of an internal-combustion engine

  • US 5,394,742 A
  • Filed: 06/18/1993
  • Issued: 03/07/1995
  • Est. Priority Date: 12/03/1990
  • Status: Expired due to Fees
First Claim
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1. A method for recognizing abnormal combustions in a cylinder of an internal-combustion engine, comprising the steps of:

  • determining a speed of the internal-combustion engine at two crankshaft positions which are different depending upon load and on speed, said two crankshaft positions defining a speed difference of the speed of the internal combustion engine at the two positions,selecting said two crankshaft positions so that, in relation to abnormal combustion, as great a speed difference as possible is obtained, andrecognizing abnormal combustion when, according to a speed difference corresponding to said two crankshaft positions selected in said selecting step, a chronologically later minus chronologically earlier rpm value or chronologically earlier minus chronologically later rpm value traverses a limit value.

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