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Cylinder identification by spark discharge analysis for internal combustion engines

  • US 5,174,267 A
  • Filed: 07/22/1991
  • Issued: 12/29/1992
  • Est. Priority Date: 07/22/1991
  • Status: Expired due to Term
First Claim
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1. A method of identifying cylinders in compression of cylinder pairs in an internal combustion engine having an even number of cylinders and a coil per plug ignition system, each coil having a primary winding and a secondary winding with the secondary winding being connected to a spark producing device in a cylinder corresponding to said coil, said method comprising the steps of:

  • driving said primary windings of said coils of said pair of cylinders substantially simultaneously to generate spark discharge energy in said secondary windings of said coils;

    monitoring said primary windings for signals representative of spark discharge in spark producing devices connected to said secondary windings; and

    analyzing spark discharge signals on said primary windings to identify which cylinder of said cylinder pair is in compression and which cylinder of said cylinder pair is in exhaust.

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