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Method and apparatus for detecting combustion pressure in engine

  • US 4,781,059 A
  • Filed: 07/10/1986
  • Issued: 11/01/1988
  • Est. Priority Date: 07/10/1985
  • Status: Expired due to Term
First Claim
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1. A combustion chamber pressure detecting apparatus comprising a combustion pressure detecting sensor which includes a diaphragm with a light reflecting surface which is deformable under the combustion pressure in the engine, light emitting means, light detecting means, optical fibers for introducing light from the light emitting means to the reflecting surface and introducing light reflected from said reflecting surface to the light detecting means, means for detecting said combustion pressure from the output of said light detecting means, comparator means for receiving as an input the output of the detecting means and as another input a reference value, said comparator means comparing the inputs applied thereto and producing a correcting signal on the basis of the output of the light detecting means at a predetermined angle of rotation of the engine, and means for applying the correcting signal to said light emitting means whereby the difference in value of the inputs to the comparator means are brought to zero.

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