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Apparatus for measuring EGR and method

  • US 7,937,208 B2
  • Filed: 12/09/2008
  • Issued: 05/03/2011
  • Est. Priority Date: 12/09/2008
  • Status: Active Grant
First Claim
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1. A method of operating an air-breathing internal combustion (IC) engine having exhaust gas recirculation (EGR) and a device for controlling EGR, said method comprising the steps of:

  • calculating the total flow of gasses consumed by said IC engine;

    measuring the actual fresh air flow to said engine;

    subtracting the actual fresh air flow from said total flow to provide a measure of EGR flow; and

    using said EGR flow as an input to said control device.

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