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Apparatus for controlling an internal combustion engine

  • US 5,115,778 A
  • Filed: 02/05/1991
  • Issued: 05/26/1992
  • Est. Priority Date: 02/21/1990
  • Status: Expired due to Fees
First Claim
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1. An apparatus for controlling an internal combustion engine comprising at least one acoustic emission transducer acoustically coupled to the internal combustion engine arranged to detect the acoustic emissions generating during the operation of the internal combustion engine and to produce an output signal corresponding to the level of the acoustic emission activity, means being arranged to rectify and envelope the transducer output signal to produce an electrical signal, means to remove the direct current component from the electrical signal, means to measure the alternating current component of the electrical signal, means to control the ignition timing of the internal combustion engine, means being arranged to monitor the level of the alternating current component of the electrical signal, the monitoring means being arranged to send a feedback signal to the means to control the ignition timing of the internal combustion engine to adjust the ignition timing to increase efficiency of the internal combustion engine.

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