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Exhaust gas recirculation system for an internal combustion engine

  • US 4,453,379 A
  • Filed: 01/24/1983
  • Issued: 06/12/1984
  • Est. Priority Date: 03/02/1982
  • Status: Expired due to Fees
First Claim
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1. An exhaust gas recirculation system for an internal combustion engine having a combustion chamber and an exhaust passage, the exhaust passage extending from the combustion chamber to the atmosphere so as to conduct exhaust gas from the combustion chamber to the atmosphere, the exhaust gas recirculation system comprising:

  • (a) first means for directing the exhaust gas back to the combustion chamber to recirculate the exhaust gas through the combustion chamber;

    (b) second means, associated with the first means, for controllably determining the percentage of the exhaust gas recirculated;

    (c) third means for sensing the average pressure in the exhaust passage; and

    (d) fourth means, responsive to the sensed exhaust pressure, for controlling the second means in such a manner that the percentage of the exhaust gas recirculated is independent of variations in the average pressure in the exhaust passage.

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