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System and method for exhaust gas recirculation

  • US 7,743,757 B2
  • Filed: 07/19/2007
  • Issued: 06/29/2010
  • Est. Priority Date: 07/19/2007
  • Status: Active Grant
First Claim
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1. A method for controlling an exhaust gas recirculation system of an internal combustion engine, the system including a first valve positioned to control flow through a first conduit and a second valve positioned to control flow through a second conduit, the first and second conduits both coupled to an intake manifold of the engine, the method comprising:

  • positioning said first valve in response to a pressure in said first conduit and a pressure in said second conduit when said second valve is closed, said first valve controlling a first exhaust gas recirculation flow through the first conduit and into the intake manifold; and

    positioning said second valve in response to a pressure in said second conduit and a pressure in said first conduit when said first valve is closed, said second valve controlling a second exhaust gas recirculation flow through the second conduit and into the intake manifold, said second flow higher than said first flow, wherein said first conduit includes a first orifice extending into the first conduit and wherein said second conduit includes a second orifice extending into the second conduit.

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