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Monitoring the operation of an internal combustion engine

  • US 4,280,358 A
  • Filed: 10/19/1979
  • Issued: 07/28/1981
  • Est. Priority Date: 10/19/1978
  • Status: Expired due to Term
First Claim
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1. A method of monitoring the operation of an internal combustion engine having inlet ducting for admitting air or a fuel/air mixture into the engine, which method comprisessensing the degree of vacuum in the inlet ducting and providing a vacuum signal when said vacuum falls below a predetermined vacuum level;

  • sensing the rotational speed of the engine and providing a first speed signal when said rotational speed exceeds a first predetermined speed value and a second speed signal when said rotational speed exceeds a second predetermined speed value greater than the first predetermined speed value;

    gating the vacuum signal and the second speed signal to provide an enabling signal when either said vacuum signal or said second speed signal, or both said vacuum signal and said second speed signal are present; and

    issuing a warning signal and/or making a recording under operational conditions of the engine in which both the first speed signal and the enabling signal are present.

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