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Diagnosis of engine power and compression balance

  • US 4,292,670 A
  • Filed: 06/11/1979
  • Issued: 09/29/1981
  • Est. Priority Date: 06/11/1979
  • Status: Expired due to Term
First Claim
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1. A method of diagnosing the performance of the cylinders of a multicylinder internal combustion engine, each of said cylinders having a firing interval and the intervals for all of said cylinders forming an engine cycle, said method comprising sensing the substantially instantaneous engine speed at a plurality of angularly spaced positions in the engine cycle, squaring said sensed speeds to obtain a function representing the engine kinetic energy at each of said angular positions, and for each firing interval obtaining the difference between the functions of the kinetic energy at two spaced angular positions.

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