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Combustion control device for internal combustion engines

  • US 5,156,126 A
  • Filed: 02/04/1991
  • Issued: 10/20/1992
  • Est. Priority Date: 02/06/1990
  • Status: Expired due to Term
First Claim
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1. A combustion control device adapted for use with an internal combustion engine having at least one cylinder, comprising:

  • cylinder pressure detecting means for detecting the combustion pressure in said at least one cylinder;

    cylinder angle detecting means for detecting a crank angle of the engine to be controlled;

    cylinder pressure monitoring means for determining and monitoring the waveform of the cylinder pressure based on the cylinder pressure detected by the cylinder pressure detecting means and a crank angle signal outputted from the crank angle detecting means;

    calculating means for calculating thermal efficiency based on the waveform determined by said cylinder pressure monitoring means; and

    combustion control means for controlling the amount of fuel supplied to the engine, ignition timing and the amount of exhaust gas recirculation, based on the thermal efficiency calculated by the calculating means and a comparison of a value of the calculated thermal efficiency with a predetermined value based on engine speed and a fuel injection pulse width.

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