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Device and method for processing a signal of pressure measurement of an internal combustion engine combustion chamber

  • US 7,660,703 B2
  • Filed: 06/21/2006
  • Issued: 02/09/2010
  • Est. Priority Date: 07/07/2005
  • Status: Active Grant
First Claim
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1. A device for processing a pressure-measurement signal of a combustion chamber of an internal combustion engine to determine an instant of start of combustion, comprising:

  • a low-pass filter configured to obtain a filtered signal from an output signal of an adder that is configured to add an amplified signal of the pressure-measurement signal and an output of a nonlinear processing element;

    means for subtracting the filtered signal from the pressure-measurement signal to obtain a difference signal;

    means for comparing the difference signal with a predetermined threshold value; and

    means for determining the instant of start of combustion as an instant at which the difference signal attains the predetermined threshold value.

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